Home

Service and Maintenance Instructions

1. Washer ES M T ES Loctite buc Thermal X Expansion Valve ye Mamas i m p p a A14212 Fig 21 Aluminum Coil Unit TXV s 26 TEFLON SEAL PISTON PISTON BRASS RETAINER HEX BODY BRASS HEX NUT A93530 Fig 22 Refrigerant Flow Control Device For FB PISTON BODY CLEANING AND REPLACEMENT 4 amp CAUTION ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental damage Do not vent refrigerant to atmosphere Recover during system repair or final unit disposal A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution could result in equipment damage Damage may occur to the scroll compressor if operated at a negative suction pressure during a system pumpdown 1 Pump down outdoor unit Close service valves at outdoor unit 2 Recover remaining refrigerant from tubing and coil through gage port on vapor tube service valve Disconnect refriger ant liquid tube from piston body See Fig 22 3 Avoid damaging seal ring or machined surfaces on piston bore and retainer 4 Using small wire with a hook on end of it remove piston from body 4 amp CAUTION UNIT DAMAGE HAZARD Failure to follow this caution could result in equipment damage When cleaning the piston orifice be careful not to scratch or enlarge the
2. 6 GG 9 POWER CONNECTOR 9ho tinanauansfug 1 2 34 5 6 7 8 CONTROL CONNECTOR Fig 6 FV4 motor ECM2 3 Motor A13028 A98201 EVA Constant Air Flow Unlike fan coils using induction motors where static pressure affects airflow these fan coils are constant airflow units The blower delivers requested airflow regardless of static pressure Consult fan coil Product Data for static pressure limits The ECM2 3 5 0 is pre programmed and contains airflow tables for all modes of operation Blower characteristics requested airflow torque and speed are known from laboratory testing If any two characteristics are known the third is defined Requested airflow is known from Easy Select board configuration and thermostat signals Torque is known because it is directly related to stator current which is measured by motor control Speed is measured by counting back EMF pulses from stator windings This information is entered into an expression that calculates torque from speed and airflow numbers If calculation does not match stored blower characteristics torque is adjusted until agreement is reached This calculation and adjustment is performed every 0 8 seconds while motor is in operation There is no direct measure of static pressure but unit does react to a change in static to maintain constant airflow A change in pressure
3. 1 Control Mounting Plate BLOWER MOTOR 2 24v Transformer 3 Time Delay Relay X 4 Blower Relay 2 Arm And Grommet 3 Blower Motor 4 Ground Lug 9 Terminal Block 9 Capacitor 6 Capacitor Strap Note This illustration is for T TENER reference only A13136 Fig 15 FFMA sizes 18 amp 24 Expanded View Duct Components Blower amp Electrical Parts EVAPORATOR PARTS amp DRAIN PANCI8K amp 24K 7 Distributor Assy 6 Header Assy 9 Coil II 8 Piston Installed 8 Throttle 9 Distributor 3 Coil Airproof Plate 2e Coil Support Plate 10 Capillary 1 Air Filter Support Plate Note This illustration is for reference only 11 Drain Plu le Drain Pan 13 Coil Roof Plate A13137 Fig 16 FFMA sizes 18 amp 24 Expanded View Evaporator Parts amp Drain Pan 20 30K amp 36K CASE Ss 1 Wrapper Assy 2 Top Plate Assy 3 Blower Assy Panel 0 0 4 Upper Filter Panel 9 Lower Filter Panel E 7 Woll Mount ag ee Brackets 6 Louvered Grill Cover TE EE gt Se J ms I OSN 8 Install Support S SISS E 3 SSS gt SS S8ss Plate SSssgs SSsss SIS ISS 2 SSsss SESS OSSESESES SS 9 Bottom Rear Plate Note This illustration is for reference only 10 Bottom P
4. necting the DC voltmeter across PL1 4 and PL1 2 The voltage should be near OVdc but it will fluctuate briefly several times per second If you have an analog voltmeter the needle briefly will go high several times per second If you have a digital voltmeter with a bar graph it will show a large change in magnitude on the bar graph several times per second If you have a plain digital voltmeter it will show a brief fluctuation in voltage and the magnitude may vary depending on the voltmeter used A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Disconnect all power to the unit before servicing the field wires or removing the control package The disconnect when used on the access panel does not disconnect power to the line side of the disconnect but does allow safe service to all other parts of the unit The minimum maintenance requirements for this equipment are as follows 1 Inspect and clean or replace air filter each month or as re quired 2 Inspect cooling coil drain pan and condensate drain each cooling season for cleanliness Clean as necessary An in spection port is provided on all A coil delta plates Remove plastic plug to inspect Replace plug after inspection 3 Inspect blower motor and wheel for cleanliness each heating and cooling season Clean as necessary 4 Inspect electrical connections for tightness and controls for proper oper
5. ECM2 3 HD44AR133 RMOD44AR133 FV4C_006 Series A ECM2 3 HD46AR244 RMOD46AR244 FV4C_002 Series B ECM5 0 HD44AR120 HK44ER120 FV4C_003 Series B ECM5 0 HD44AR121 HK44ER121 FV4C_005 Series B ECM5 0 HD44AR122 HK44ER122 FV4C_006 Series B ECM5 0 HD46AR223 HK46ER223 A w fe SEC1 SEC2 SAMP pc a d 200 CO WX yy x EASY SELECT AUX HEAT KW CFM 0 R 0 30 0 20 0 10 0 5 1075 875 725 625 E yo W vio O O 0O O AC HP SIZE Wp 036 030 024 018 l Bu O O O O h Y SYSTEM TYPE a AC HP COMFORT HP EFF YN oRN O O AC HP CFM ADJUST ANNE NOM LO H 8r G BLK O O Lor aa Oo ON OFF DELAY m 0 30 0 ENH 90 90 0 a C wt O O1O O 3 CONTINUOUS FAN AUXi HUMI LO MED HI YEL C X4 MEE AUX Humo i P 5 Pi 24VAC T 10 2D HEATER MOTOR GRY Fig 7 Easy Select Board SYSTEM DIAGRAM HEATER MOTOR SEC1 SEC2 SS soe ST looooooooooo0Q E Piles eleleleBER Di 5 AMP ih Du te R te QW US C J2 Sw 5 gt Yi e gt Q YN2 DIODE G LOGIC Qo i S c Lyx Y Y Y Y rh AUX HEAT AC HP SYSTEM AC HP CFM ON OFF CONTINUOUS KW CFM SIZE TYPE ADJUST DELAY FAN Fig 8 Easy Select Board Schematic 8 A13029 A96431 Table 2 Connections and Connectors FK4C Pin No Pin 1 Type Connection Type C
6. ously removed 7 Attach green wire to blower housing with screw 8 Connect electrical and capacitor leads to original terminals 9 Replace blower access door and tighten all four screws 10 Reinsert disconnect pullout only after blower access door is secured Test blower for proper operation BLOWER WHEEL l l INLET RING 1le lt GROMMET M d MOTOR A86006 Fig 20 Motor Inlet Ring and Blower Wheel Assembly 25 REFRIGERANT FLOW CONTROL DEVICES THERMOSTATIC EXPANSION VALVES TXV The FX4 FV4 FF1E and FE4 Fan Coils are factory equipped with a hard shutoff HSO TXV The hard shutoff TXV has no bleed port and allows no bleed through after system is shutdown The TXV is a bi flow metering device that is used in condensing and heat pump systems to adjust to changing load conditions by maintaining a preset superheat temperature at outlet of evaporator coil The volume of refrigerant metered through valve seat is dependent upon the following 1 Superheat temperature sensed by sensing bulb on suction tube at outlet of evaporator coil As long as this bulb con tains some liquid refrigerant this temperature is converted into pressure pushing downward on the diaphragm which opens the valve via push rods 2 The suction pressure at outlet of evaporator coil is trans ferred via the external equalizer tube to underside o
7. power to system There may be more than one disconnect switch Turn off accessory heater power if applicable Lock out and tag switch with a suitable warning label FAN MOTOR The motor is three speed direct drive High speed lead is black medium speed lead is red low speed lead is blue and common lead is purple Be sure proper blower speed has been selected The motor is turned on through two different routes The first occurs when thermostat calls for the fan in cooling heat pump or fan only mode A 24 Vac signal is sent to relay causing relay to close its normally open contacts turning fan on The second occurs when there is a call for electric heat A 24 Vac signal is sent to heater sequencer relay causing it to close directing 230V through the normally closed contact of fan relay turning fan on The fan remains on until sequencer relay opens If motor does run test motor for an open winding or a winding shorted to motor case If either is present replace motor ELECTRIC HEATER SERVICE Service can be completed with heater in place Shut off power before servicing A Limit Switch Refer to Electric Heater Kit Function and Troubleshooting section of this manual B Sequencer Refer to Electric Heater Kit Function and Troubleshooting section of this manual C Transformer A 40 VA transformer supplies 24 V power for control circuit Check for 208 230V on primary side of transformer If present check for 24V on s
8. prompt installer to enter correct model size from a list of valid sizes 3 If motor size is incorrect for model size motor must be re placed with proper size motor Fan coil control will not re spond to operation requests until this fault condition is resolved STATUS CODE 27 INVALID OUTDOOR UNIT SIZE On initial power up fan coil control will write into memory outdoor unit size as provided by User Interface in a fully communicating system 1 If outdoor unit size is invalid Status Code 27 will be dis played on STATUS LED 2 User Interface will prompt the installer to choose size from a list of valid sizes for application with fan coil 3 Check communications wiring to be sure User Interface has established communications with outdoor unit or select proper size from valid size list provided at User Interface 4 Check motor and motor control module following the in structions in Section C ECM Motor Troubleshooting 15 STATUS CODE 26 INVALID HEATER SIZE On initial power up fan coil control will write into memory electric heater size as read from heater if heater is provided with Identifier Resistor IDR Heater size must be valid for combination of indoor and outdoor components installed Fan coil control will read IDR value connected to Pins 5 and 8 of heater harness connector If no resistor is found system User Interface will prompt installer to verify that no heater is installed Verifying that this is correct
9. BYPASS THE LIMIT SWITCH When replacing limit switch ensure that it is replaced with a limit switch of identical opening temperature and closing differential Limits switches are typically color coded to identify their range B Sequencer The sequencer is essentially a thermally activated time delay relay normally activated by low voltage control signals from thermostat The typical sequencer is a 1 or 2 pole normally open device which energizes within 30 to 70 seconds after application of control signal and de energizes 60 to 90 seconds after control signal is removed In simplistic terms the sequencers which we use are nothing more than normally open limit switches which sit on top of a small resistive heater When voltage is applied to this heater a positive temperature coefficient resistor PTC heat is supplied to a bimetallic disc which snaps through and closes switch The time required for PTC to heat to a sufficient point controls ON timing of device The time required for disc to cool down when power is removed controls OFF time of device The PTC can be varied to provide varied timing Typically a short ON equates to a long OFF Because this is a thermally activated device ambient conditions affect the ON OFF cycle Higher ambient temperature means shorter ON times and longer OFF times Application of these devices is such that the first switch ON not only turns on first heater element but also ensures that indoor fan i
10. G and N connections at the motor Correct any voltage issue before proceeding to the next step 2 The motor is communicated through 24 Vac signals to the 1 2 3 4 5 and C common terminals Not all taps are pro grammed if low voltage is applied to an non programmed terminal the motor will not operate which is normal Verify the part number of the motor matches the correct replace ment motor part number for the unit model number 3 Initiate a demand from the thermostat and check the voltage between C common and terminal 1 5 If voltage is present and the motor isn t operating then the motor control module is failed C Prior to installing the replacement control module the motor section condition needs to be verified 1 Check to see if the blower wheel spins freely 2 To check for short to ground use an ohmmeter to measure the resistance from any one of the motor connector pins to the aluminum end plate of the motor This resistance should be greater than 100 000 ohms 3 Check the motor phase to phase resistance between each of the leads in the three pin motor connector The lead to lead resistance across any two leads should be less than 20 ohms Each lead to lead resistance should be the same within 10 percent 4 If any motor fails any of the three tests do not install a new control module The new control can fail if placed on a de fective motor The prior fan coil models with multi speed ECM blower mo
11. R and C on the low voltage terminal block and that there is a good connection with the R and G jump er 10 If 24V is present and the jumper connections are good 11 Replace the board Check Board 12 If Fault Code 44 and the Motor LED are both flashing place a DC voltmeter across terminals PL1 1 Red to PL1 2 Green See Fig 13 13 Across terminal PL1 1 and PL1 2 a 12 Vdc should be present If 12Vdc is not present replace circuit board HK38AE011 14 If Fault Code 44 is flashing and the Motor LED is flashing place a DC voltmeter across terminal PL1 3 and PL1 2 C 15 Across terminal PL1 3 and PL1 2 the DC volt meter should display 5Vdc The voltage should be very stable and should not fluctuate more than 02Vdc If the voltage fluctuates get a different voltmeter before proceed ing to the following steps 16 Reconnect Plug 1 to circuit board HK38AE011 and con nect DC voltmeter across terminals PL1 3 Yellow and PL1 2 Green Does the voltage appear to fluctuate more than in step 15 Typical voltmeters will show a fluctuation of 2Vdc to 1Vdc The amount of fluctuation is not import ant You could see even more fluctuation depending on the voltmeter used 17 17 Check the blower motor serial output signal The blinking LED on the control board represents the serial output signal You can measure the signal with a DC voltmeter by remov ing Plug 1 from the circuit board HK38AE011 and con
12. a 24 Vac signal on Electric Heater stage 1 and stage 2 outputs If fan coil control energizes either heater stage and does not detect the 24 Vac signal on output Status Code 36 will be displayed on the STATUS LED Fan coil control will continue to energize heater output s and adjust blower operation to a safe airflow level for energized electric heat stage s To find the fault check for 24Vac on heater stage outputs Fan coil control or sensing circuit may be bad NOTE It may be useful as an electric heater troubleshooting procedure to disconnect the system communications to force Status Code 16 enabling of emergency heat mode It is difficult to know which heater output is energized or not energized in normal operation When fan coil is operated in emergency heat mode using electric heaters both outputs are energized and de energized together Terminal strip inputs to control can then be connected R to W to turn on both electric heat outputs Heater output sensing circuits can then be checked to resolve Status Code 36 or 37 problems STATUS CODE 41 BLOWER MOTOR FAULT If MOTOR LED is lit and flashing and motor does not run 1 Check STATUS LED If STATUS LED is indicating Status Code 41 motor control has detected that the motor will not come up to speed within 30 seconds of being commanded to run or that the motor has been slowed to below 250 rpm for more than 10 seconds after coming up to speed Motor wiring harness and fan coil co
13. a 24 Vac signal on either heater stage output and it is not supplying signal Status Code 37 will be displayed on STATUS LED Fan coil control will turn off output and command blower motor to supply an airflow determined to be safe for current operation mode with electric heaters energized To find the fault 1 Stop all system operations at User Interface and check heat er stage 24 Vac outputs 2 Disconnect electric heater at plug receptacle 2 and check heater wiring for faults See Status Code 36 for more in formation STATUS CODE 44 MOTOR COMMUNICATION FAULT The MOTOR LED is connected to the blower motor communication line and works with the fan coil control microprocessor and STATUS LED to provide fan coil operation and troubleshooting information When motor is commanded to operate the MOTOR LED will be turned on and will flash each time instructions are sent to the motor When the motor is commanded to stop the MOTOR LED will be turned off The MOTOR LED will not flash to indicate communications when it is turned off Fan coil control is constantly communicating with the motor even when the motor and MOTOR LED are off If motor does not acknowledge receipt of communications the control will display Status Code 44 on STATUS LED and continue to try to communicate with the motor If motor acknowledges communication status code will be cleared If MOTOR LED is lit and flashing and motor does not run 1 Check the
14. and single pole single throw relay FR is energized The normally open contacts close causing blower to operate The circuit between R and Y is also complete This completed circuit causes contactor in outdoor unit to close which starts compressor and outdoor fan HEATING When thermostat calls for heating and FAN switch is set on AUTO the circuit between R and W is complete The heater sequence SEO is energized which closes contacts of relay There will be a time delay This completed circuit energizes all heating elements HTR and blower motor B Heat Pump COOLING On a call for cooling the thermostat makes circuits R O R Y and R G Circuit R O energizes reversing valve switching it to cooling position Circuit R Y energizes contactor starting outdoor fan motor and compressor Circuit R G energizes indoor unit blower relay starting indoor blower motor When thermostat is satisfied its contacts open de energizing contactor reversing valve and blower relay This stops compressor and fan motors HEATING On a call for heating the thermostat makes circuits R Y and R G Circuit R Y energizes contactor starting outdoor fan motor and compressor Circuit R G energizes indoor blower relay starting blower motor Should temperature continue to fall R W circuit is made through Second stage room thermostat bulb Circuit R W energizes a sequencer bringing on supplemental electric heat When thermostat is satisfied its contacts open de
15. call for electric heat A 24 Vac signal is sent to heater sequencer relay causing it to close directing 230V through the normally closed contact of fan relay turning fan on The fan remains on until sequencer relay opens If motor does run test motor for an open winding or a winding shorted to motor case If either is present replace motor ELECTRIC HEATER SERVICE Service can be completed with heater in place Shut off power before servicing A Limit Switch Refer to Electric Heater Function and Troubleshooting section of this manual B Sequencer Refer to Electric Heater Function and Troubleshooting section of this manual C Transformer A 40 VA transformer supplies 24 V power for control circuit Check for 208 230V on primary side of transformer If present check for 24V on secondary side NOTE Transformer is fused Do not short circuit D Fan Relay Relay coil is 24 V Check for proper control voltage Replace relay if faulty CLEANING OR REPLACING REFRIGERANT FLOW CONTROL DEVICE Refer to Fig 22 and instructions given in Piston Body Cleaning or Replacement section The refrigerant flow control device is protected by a wire mesh strainer It is located inside the 3 8 in liquid tube at field braze joint next to flow control device Access to strainer is through field braze joint SEQUENCE OF OPERATION A Condensing Unit COOLING When thermostat calls for cooling the circuit between R and G is complete
16. energizing contactor and sequencer All heaters and motors should stop CES013003 00 01 HK61EA002 HK61EA006 CONTROL BOARDS This section of the service manual describes the CESO130003 00 and 01 PCB by examining the functional operation of the PCB components Printed Circuit Board PCB Component Layout of the actual PCB is depicted in Fig 1 and Fig 2 1 The low voltage stripped leads are used to connect the 24 V side of transformer to indoor thermostat and outdoor section 2 A 5 amp fuse is used to protect the low voltage trans former secondary 3 The fan relay is controlled by thermostat and turns fan on and off 4 A plug is used as the connection for PCB power and electric heaters Note the pin numbers on plug 5 A time delay relay circuit keeps fan motor running for ap proximately 90 seconds after G is de energized The time delay can be defeated by cutting jumper JW1 on the CES0130003 01 HK61EA002 and HK61EA006 UNIT FUNCTIONS A Transformer 1 Proper Wiring of Transformer Primary or High Side Yellow wire from Molex plug is wired to C terminal on transformer and black wire from PCB relay normally open terminal is wired to 208 V or 230 V terminal on transformer Units are factory wired at 230 V terminal 2 Proper Wiring of Transformer Secondary or 24 V Side Red wire of transformer is wired to T terminal on PCB and brown wire of transformer is wired to C terminal on PCB NOTE T terminal on PCB is
17. fan coil control is cycled off the fault code will be cleared on the next power up but the fault will remain and system operation will not be as expected This is because on power up the fan coil 16 control cannot discern the difference between an open sensor or if a sensor is not installed F Emergency Heating and Cooling Modes Fan coil control can provide emergency heating or cooling using a common heat cool thermostat in the event that there are no system communications fault is in User Interface and no replacement is immediately available To activate these modes the thermostat and outdoor unit must be wired as a common heating cooling system to fan coil control RYWC terminals Fan coil control must be powered and displaying Status Code 16 System Communication Fault NOTE These emergency modes do not provide the level of comfort and efficiency expected by the consumer and should only be activated when User Interface cannot be replaced immediately FE4A FAN COIL SEQUENCE OF OPERATION The FE4A fan coil is designed for installation with a communicating User Interface This fan coil will not respond to commands provided by a common thermostat except under certain emergency situations described in the Start Up and Troubleshooting sub section The User Interface uses temperature humidity and other data supplied from indoor and outdoor system components to control heating or cooling system for optimum comfort FE4A ADVANCED TROU
18. see Fig 4 for motor speed selection location NOTE In low static applications lower motor speed tap should be used to reduce possibility of water being blown off coil Tap 1 Low Medium 90 sec off delay 90 sec off delay Electric heat t 0 sec off delay Max t 0 sec off delay T electric heat airflow is same CFM as Tap 3 except 0 sec off delay t high static applications see airflow tables for max airflow oo tC tm OC Speed Taps may be located on motor or on plug close to motor A11048 Fig 4 Motor Speed Selection for FB4C FX4D amp PF4 odd sizes OPTIONAL SAFETY GROUND DRAIN HOLE B OPTIONAL SAFETY GROUND Lees CONTROL POWER NOOO Oo00g 0o00 O 00 0y I I m DRAIN HOLE DRAIN HOLE m WARNING RISK OF IN sectae stock ALLOW 5 MNUTES AFTER POWER IS DISCONNECTED BEFORE CPENNG MOTOR J il s li WII OL i m F E Fig 5 FV4 motor ECMS 0 Motor
19. signal to the fan coil when the outdoor temperature is between 10 and 40 F This triggers the motor to slow to approximately 213 CFM per ton The heaters will stage as needed during this mode and the motor will adjust airflow as required Below 10 F the W1 control output will automatically energize on a call for heat The ECM2 3 5 0 power connections are made at the transformer primary terminals The transformer secondary connections are made at SEC1 and SEC2 connectors EASY SELECT CONFIGURATION TAPS The Easy Select taps are used by installer to configure system The ECM2 3 5 0 uses selected taps to modify its operation to a pre programmed table of airflows Airflows are based on system size and mode of operation and those airflows are modified in response to other inputs such as the need for de humidification See Fig 7 The FV4 Fan Coils must be configured to operate properly with System components with which it is installed To successfully configure a basic system see information printed on circuit board located next to select pins move the six select wires to pins which match components used along with homeowner preferences A Auxiliary Heat Range The installer must select the auxiliary heat airflow approved for application with kW size heater installed Each select pin is marked with a range of heaters for which airflow also marked is approved For increased comfort select the narrowest kW range matching the heater
20. to G R to Y2 for heat pump heating operation With J2 jumper in place energizing either W1 or W2 will produce the W2 airflow This is the greater of heat pump heating and auxiliary heat airflow plus an additional 15 percent The elected delay profile is not active in this mode I Staged Auxiliary Heat with Heat Pump Heating Mode The auxiliary heat can be staged by removing the J2 jumper that ties W1 and W2 terminals together Staging can be done by using outdoor thermostats or by using the Intelligent Heat Staging option where the indoor control can be configured for three stage electric heat The unit will automatically adjust airflow when the different stages of heat are energized The airflow delivered will depend on the heat pump size selected and electric heat size selected The greater of the two airflows will be delivered The selected delay profile is not active in this mode J Electric Heat without Heat Pump Thermostat closes R to W and thermostat should be set up to energize G with W This is due to the Super Comfort Heat programming in the motor Energizing W without G will result in 25 lower airflow delivery The selected delay profile is not active in this mode K Super Comfort Heat Mode This is a special heating mode only available on FV4 fan coils combined with a Thermidistat Control or Comfort Zone II B When this option is selected the indoor control will monitor the outdoor temperature The control will drop the G
21. to it C If Transformer Fuse Keeps Blowing When low voltage fuse blows it means transformer would have blown if fuse had not been in circuit to protect it The fuse usually 3 blows when there is a high current draw on transformer high voltage applied to low voltage circuit or a direct secondary short When there is a high current draw on transformer it is most likely because transformer has been shorted or system is trying to draw more VA than transformer rating allows When fuse blows because of high voltage the system has mixed high and low voltage signals 1 Check wiring of sequencers relays as shown in Fig 1 and Fig 2 Be sure transformer is not shorting out because ther mostat wires are miswired 2 Check wiring of relays as shown in Fig 1 And Fig 2 Be sure low voltage and high voltage wiring is correct replace transformer with one that has a higher VA rating and meets system specifications D If Fan Runs Continuously 1 If PCB has no low voltage power check blue and black fan leads These may be switched at sequencer relay 2 If PCB has low voltage power check fan relay to see if it is opening and closing It may be stuck in the normally closed position due to debris in relay E Transformer Failure 3 Check VA draw on transformer If VA draw is more than VA rating of transformer fuse will blow If this is the case 1005 161 RC gt R3 gt d R6 Ri CC gt
22. used to protect the transformer T terminal is connected through the fuse to R terminal on PCB B Indoor Fan 1 Wiring Indoor fan motor yellow lead is wired to C terminal on transformer The red blue or black speed lead is wired to SPT terminal on fan relay part of PCB Units are factory wired on medium speed blue lead connected NOTE Unused fan speed leads must be capped or taped off to prevent direct short to cabinet surface 2 Functional Control a Thermostat and Relay Control When thermostat calls for the fan in cooling heat pump heating or fan only mode a 24 Vac signal is sent to relay This causes the relay to close its normally open contacts turning on fan When thermostat no longer calls for the fan the signal sent to relay is turned off and relay opens causing fan to turn off after a 90 second fan off delay b Sequencer Electric Heat Relay Interlock The fan will also operate whenever there is a call for electric heat even if fan relay is not energized This happens be cause fan is interlocked with first stage of electric heat through the normally closed contact of fan relay NOTE The fan interlock is only connected to first stage electric heat W2 W3 and E do not contain an interlock with fan See outdoor thermostat installation instructions when electric heat staging is desired C Electric Heat When thermostat calls for electric heat a 24 Vac signal is sent to sequencer heat relay through W2 causin
23. will result in a change in stator speed and torque The motor will begin to adjust on the next sampling calculate new desired speed and torque and adjust as necessary INTEGRATED CONTROLS AND MOTOR ECM2 3 5 0 An ECM2 3 5 0 is fed high voltage AC power through the 5 pin connector See Fig 6 or Fig 5 The AC power is then internally rectified to DC by a diode module After rectification DC signal is electronically communicated and fed in sequential order to three stator windings The frequency of these commutation pulses determines motor speed The rotor is permanently magnetized An ECM2 3 5 0 is powered with high voltage at all times The motor will not run with high voltage alone Low voltage must be applied to control plug to run motor ECM2 3 5 0 Control Power The ECM2 3 5 0 control power is supplied from R circuit through printed circuit runs to motor control Connector Pin 8 through motor control harness to motor The C side of low voltage control power circuit is connected by printed circuit runs to motor Connector Pins 9 10 and 11 then through motor control harness to motor Low Voltage Circuit Fusing and Reference The low voltage circuit is fused by a board mounted 5 amp automotive type fuse placed in series with transformer SEC2 and R circuit The C circuit of transformer is referenced to chassis ground through a printed circuit run at SEC1 connected to metal standoff marked NOTE The PCB must be mounted with two
24. will establish that fan coil is operating without an electric heater accessory Upon choosing negative option installer will be prompted to select heater size installed from a list of valid heater sizes for fan coil and outdoor unit size installed If heater ID resistor value read is invalid Status Code 26 will be displayed on STATUS LED If heater installed is equipped with a resistor connected to Pins 5 and 8 of heater harness connector and Status Code 26 is displayed on STATUS LED 1 Check wiring harness connections to be sure connections are secure 2 If symptoms persist disconnect wiring harness at fan coil control heater header and check for a resistance value great er than 5000 ohms 3 Check for proper wiring of resistor assembly 4 Make sure heater size installed is an approved size for out door unit and fan coil sizes installed NOTE Fan coil control will not operate electric heater until this Status Code is resolved If the heater size is set through the User Interface the heater will be operated as a single stage heater If staging is desired the IDR value must be read in by the fan coil control Table 5 FEA self identifying resistor values Heater Size Resistor Ohms kW Nominal No heater Open 9 11k 15 18k 20 24k 24 33k 30 39k Hydronic Heat 270k STATUS CODE 36 HEATER OUTPUT NOT SENSED WHEN ENERGIZED Fan coil control is provided with circuitry to detect presence of
25. 0 90 4 ENH enhanced selection provides a 30 seconds on 150 seconds at 70 percent airflow and no off delay F Continuous Fan Select desired continuous fan profile LO MED or HI Airflow are provided to customize and enhance the continuous fan functions See Fig 7 The possible selections are 1 LO provides 50 percent of Y Y2 Cool airflow 2 MED provides 65 percent of Y Y2 Cool airflow 71 per cent on 006 model 3 HI provides 100 percent of Y Y2 Cool airflow The factory setting is LO NOTE If applied to two speed unit do not select continuous fan as HI since low speed cooling will also run at HIGH airflow and insufficient dehumidification may result G Easy Select Board Jumpers Ji This jumper must be pulled to activate dehumidification mode The jumper connects R to DH With the jumper in the DH terminal is always energized With the jumper pulled the DH terminal is de energized A control such as the Thermidistat must be used to supply the 24 V signal when there is no call for dehumidification and turn off the 24 V when there is a call for dehumidfication J2 This jumper activates heat staging The jumper connects the W1 and W2 terminals together If either is energized W2 airflow is delivered With the jumper pulled there are separate airflows for W1 and W2 H Airflow Delivery These units deliver airflow depending on the system size selections and operating mode The thermostat energizes a comb
26. 3 Pin 9 212Vdc R to Y Y2 Pin 14 Pin 1 Pin 2 Pin 9 12Vdc R to G LO Pin 15 Pin 1 Pin 3 Pin 9 OVac R to G MED Pin 6 Pin 1 Pin 3 Pin 9 212Vdc R to G HI Pin 14 Pin 1 Pin 2 Pin 9 212Vdc n 118 VAC BRANCH CKT EASY SELECT eO GND P ge BOARD TERMINAL o a xi BLOCK tr s oO 2 l l l l J1 BER lt p HUMIDISTAT 24 VAC RELAY a 4 m XE ae 1S WHT qd TO EAC i COMO H8 EN AQ5316 A98625 Fig 10 Humidistat Wiring for De Humidify Mode Fig 9 KFAIR0201ACR Relay Kit Wiring Schematic 12 FEA Model FE4A fan coil is designed to be installed with a communicating user interface The FE4A fan coil will provide airflow at a rate commanded by the User Interface The nominal airflow ton rate is 350 CFM ton The User Interface will modify the commanded airflow under certain operating modes Refer to the User Interface literature for further system control details This fan coil will not respond to commands from a common thermostat except under certain emergency situations explained in this document ELECTRONICALLY COMPUTED MOTOR ECM3 0 An ECM3 0 is fed high voltage AC power through the 5 pin connector The AC power is then internally rectified to DC by a diode module After rectification DC signal is electronically communicated and fed in sequential order to 3 stator windings The frequency of these communication pulses determines motor speed The rotor is permanently magnetized ECM3 0 CONTROL
27. BLESHOOTING PUSE JAMP n Ue o Communication E n LED LAH HUM C O xuv o Motor aA LED o A13030 Fig 12 FE4A Circuit Board LED Locations Troubleshooting the FE Fan Coil Circuit Board Production Unit circuit board Fan Coil part number HK38EA011 RCD Replacement circuit board HK38EA012 Older circuit board part numbers HK38EA006 and HK38EA009 Primary test that should be performed Motor Line Voltage Check 1 Turn off power 240V 2 Remove Plug 3 from ECM motor 3 Turn on power 4 Check Plug 3 terminals 4 and 5 to ensure there are 240V 5 Turn off power 6 Reconnect Plug 3 to motor A13031 Fig 13 FE4A ECM Plug Wiring Diagram The following troubleshooting techniques will assist in determining the correct component to replace when the Fan Coil Board HK38AEO011 presents a Fault Code 44 or 41 1 Disconnect power from the unit 240V 2 Disconnect the ABCD connector from the board 3 Disconnect Plug 1 from the board HK38AE011 See Fig 13 4 Turn on power 240 volts 5 After reestablishing power you should receive Fault Code 44 and the motor LED should be off 6 Place a jumper across the R and G terminals on the low voltage terminal block 7 Fault Code 44 should still be flashing 8 The Motor LED should be flashing indicating the board is able to transmit a signal to the motor 9 If Motor LED is not flashing check to ensure that 24V is present across
28. FB4 FE4 FFIE FH4 FV4 FX4 PF4 FFM Residential Fan Coil Units Service and Maintenance Instructions NOTE Read the entire instruction manual before starting the installation TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS 2 0055 1 INTRODUCTION ce RR REED Ve ERR e EE 1 FAN COIL DESCRIPTION AND TROUBLESHOOTING 2 19 FYS5 FH4 PF4 even sizes and FFIE even sizes 2 FB4C FX4D PF4 odd sizes and FF1E odd sizes 5 EVA alueesaee tpa A be Re pea pd pA 7 FRA uheieetebbex eR ieee ber de E iR 13 lU MET 18 ELECTRIC HEATER FUNCTION AND TROUBLESHOOTING esseees 22 23 FB4 FE4 FF1E FH4 FV4 FX4 and PF4 22 FEM MEM 23 CARE AND MAINTENANCE 00 5 23 25 FB4 FE4 FH4 FV4 FX4 and PF4 0 00 23 FF1E and PEM eR BU SEP RIPDe r eb bHeRETU 24 REFRIGERANT FLOW CONTROL DEVICE 26 27 Thermostatic Expansion Valve TXV 26 Piston Body Cleaning and Replacement 27 ALUMINUM COIL REPAIR 000000020 27 COIL amp CONDENSATE PAN REMOVAL and REPLACEMENT FB4 FE4 FX4 and FV4 28 29 PURON QUICK REFERENCE GUIDE 30 SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause death personal injury or property damage Consult a qualified installer service agency or
29. POWER The ECM3 0 control power is supplied from R circuit through printed circuit runs to motor control connector Plug 1 Pin 1 through motor control harness to motor The C side of low voltage control power circuit is connected by printed circuit runs to motor connector Plug 1 Pin 2 then through motor control harness to motor A digital signal is sent from Plug 1 Pins 3 and 4 to communicate with the motor including all airflow requirements LOW VOLTAGE CIRCUIT FUSING AND REFERENCE The low voltage circuit is fused by a board mounted 5 amp automotive type fuse placed in series with transformer SEC2 and R circuit The C circuit of transformer is referenced to chassis ground through a printed circuit run at SEC1 connected to metal standoff NOTE The PCB must be mounted with two screws and motor ground lead secured to blower housing or erratic motor operation can result TRANSFORMER MOTOR AND ELECTRIC HEATER POWER CONNECTION Transformer high voltage supplied from electric heater package or high voltage leads through 12 pin heater connector plug recp2 The ECM3 0 power connections are made at the transformer primary terminals The transformer secondary connections are made at SEC1 and SEC2 connectors TROUBLESHOOTING FE4 NOTE Always check high and low voltage supply to the fan coil components Check the integrity of the plug receptacle connections and fan coil wiring harness prior to assuming a component failure A LED Descrip
30. STATUS LED If STATUS LED is indicating a Status 44 code check the motor wiring harness for proper connection to control and motor receptacles 2 Check motor wiring harness to be sure all wiring complies with wiring diagram description makes a complete circuit from connector to connector and is not shorted 3 Check 12 Vdc low voltage supply to motor at Pins 1 and 2 of motor header connection to fan coil control If all checks are normal fan coil control is good and control module on motor may need replacement Check motor and Motor Control Module following the instructions in Section C ECM Motor Troubleshooting Shorted or mis wiring of the low voltage motor harness wiring will not cause damage to fan coil control or to motor control module If the MOTOR LED is off STATUS LED is indicating a Status Code 44 and motor is running Disconnect the motor harness at the fan coil control If motor continues to run fan coil control is good and control module on motor may need replacement STATUS CODE 25 INVALID MOTOR MODEL SELEC TION On initial start up fan coil control shall poll motor for its size data and check fan coil size data stored in fan coil control memory 1 If motor size is incorrect for fan coil size or fan coil size data is invalid Status Code 25 will be displayed on STATUS LED 2 If model size data is missing as is the case when a replace ment fan coil control is installed system User Interface will
31. URY HAZARD Failure to follow this caution may result in personal injury Use of torch may cause oil to catch fire resulting in personal injury or death To remove components use tubing cutter only 4 Disconnect liquid and vapor lines from indoor coil Use a tubing cutter to cut the lines 5 Remove coil access panel 6 Remove clip securing fitting panel to condensate drain pan and remove fitting panel 7 Remove all shipping clips if present including horizontal pan clip Slide coil and condensate pan assembly out of unit 8 Remove horizontal condensate drain pan from coil if present and condensate pan assembly See Fig 23 9 Remove 4 coil brackets if present See Fig 23 10 Remove screws at delta plates and remove coil from vertical condensate drain pan See Fig 23 11 Horizontal Applications Only Remove drain connections and J shaped tube from original coil and install them in same position on new coil See Fig 23 12 Place coil assembly in plastic condensate pan and secure with 4 screws through delta plate See Fig 23 13 Horizontal and Upflow Applications Only Attach 4 coil brackets to coil and pan assembly See Fig 23 14 Horizontal Applications Only Place horizontal condensate pan into position on coil and pan assembly NOTE Installation of horizontal condensate pan is not necessary for upflow or downflow applications 15 Slide completed assembly into unit 16 Reinsta
32. apor service valve g Recover any remaining refrigerant NOTE All condenser coils hold only a factory supplied amount of refrigerant Excess refrigerant such as in long line applications may cause compressor internal pressure relief valve to open indicated by sudden rise in vapor pressure before refrigerant is COIL MOUNTING SCREW recovered If this occurs turn off electrical supply to outdoor unit immediately front seat close vapor service valve and recover any remaining refrigerant 2 Turn off electrical supply to indoor unit 3 Disconnect condensate drain line A CAUTION PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury Use of torch may cause oil to catch fire resulting in personal injury or death To remove components use tubing cutter only 4 Disconnect liquid and vapor lines from indoor coil Use a tubing cutter to cut the lines Remove coil access and fitting panels Remove 1 screw securing coil to unit casing Remove coil pan assembly from unit 9o AAN Place assembly on a flat surface On units manufactured prior to 1996 remove two screws securing coil support columns to pan See Fig 24 9 Rotate columns 90 pull away from coil and remove columns from assembly 10 Remove two screws securing coil to condensate pan See Fig 24 and 25 11 Remove coil from condensate pan 12 Install new coil into condensate pan using two original screws and tw
33. arting indoor blower motor When thermostat is satisfied its contacts open de energizing contactor reversing valve and blower relay This stops compressor and fan motors 18K amp 24K CASE 1 Wrapper Assy 2 Top Plate Ass 3 Blower Assy Panel 4 Upper Filter Panel 9 Lower Filter Panel 6 Louvered Grill Cover Note This illustration is for reference only Louvered Grill Cover is an accessory T HEATING On a call for heating the thermostat makes circuits R Y and R G Circuit R Y energizes contactor starting outdoor fan motor and compressor Circuit R G energizes indoor blower relay starting blower motor Should temperature continue to fall R W circuit is made through second stage room thermostat bulb Circuit R W energizes a sequencer bringing on supplemental electric heat When thermostat is satisfied its contacts open de energizing contactor and sequencer All heaters and motors should stop 7 Wall Mount Brackets 8 Bottom Rear Plate 9 Bottom Plate Assy A14213 Fig 14 FFMA sizes 18 amp 24 Expanded View Case 19 DUCT COMPONENTS 18K amp 2 4K BLOWER amp ELECTRICAL PARTS DUCT COMPONENTS Q e 4 Blower Dischorge Plote 3 Rear Heater Support Plate 2 Heater Blank ff Plate 1 Blower Deck ELECTRICAL PARTS
34. ation each heating and cooling season Service as necessary A CAUTION CUT HAZARD Failure to follow this caution may result in personal injury Sheet metal parts may have sharp edges or burrs Use care and wear appropriate protective clothing and gloves when handling parts FILTER ASSEMBLY To clean or replace air filter push plastic connectors toward center of unit and remove filter access panel outward Push filter up and back into unit Then slide filter out Clean filter by using cold water and mild detergent Rinse and allow filter to dry No oiling or coating of filter is required New filters are available from your local distributor Place filter in slot with cross mesh binding up or facing cooling coil and replace filter access panel COOLING COIL DRAIN PAN AND COND DRAIN The cooling coil is easily cleaned when it is dry Inspect the coil and clean if necessary before each cooling season To check or clean cooling coil remove coil access panel If coil is coated with dirt or lint vacuum it with a soft brush attachment Be careful not to bend coil fins If coil is coated with oil or grease clean it with a mild detergent and water solution Rinse coil thoroughly with clear water Be careful not to splash water on insulation FFM A WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death Before installation or servicing system always turn off main
35. bly out of blower housing 5 With blower wheel inlet ring and motor mount still at tached to motor place motor on flat horizontal surface shaft up Mark position of wheel on motor shaft for reas sembly 6 Loosen blower wheel setscrew and remove blower wheel from motor shaft NOTE Further disassembly of motor and mount is not necessary as adequate clearance is available to clean motor 7 Clean blower motor and wheel using a vacuum with a soft brush attachment Remove grease with a mild solvent such as hot water and detergent Be careful not to disturb balance weights clips on blower wheel vanes Do not drop or bend wheel as balance will be affected To reassemble unit proceed as follows 1 Place motor with mount attached on flat horizontal surface with shaft up 2 Set inlet ring on top of motor mount grommets Center inlet ring flush on all three grommets 3 Slide blower wheel onto motor shaft with setscrew upward and aligned with shaft flat portion Vertically position wheel along shaft to position marked during disassembly NOTE If previous shaft was not marked or if replacing previous motor set blower wheel position by sliding blower wheel along motor shaft to 1 1 8 in above rubber grommets See Fig 20 4 Hold blower wheel in place and carefully tighten setscrew 5 Position motor and blower wheel assembly to blower hous ing as originally oriented 6 Secure motor mount to blower housing using bolts previ
36. d resistance between any motor lead and unpainted motor end should exceed 100 000 ohms 3 Failing any of these tests entire ECM motor must be re placed 4 Passing all of the tests motor control module alone can be replaced 14 MOTOR TURNS SLOWLY 1 Low static pressure loading of blower while access panel is removed will cause blower to run slowly Particularly at low airflow requests This is normal do not assume a fault ex ists 2 Recheck airflow and system static pressure using User Inter face service screens with access panel in place NOTE Blower motor faults will not cause a lockout of blower operation Fan coil control will attempt to run the blower motor as long as User Interface maintains a demand for airflow Fan coil control will not operate electric heaters while a fault condition exists The fan coil control communicates with the motor at least once every five seconds even when the motor is idle If during operation the fan coil control does not communicate with the motor for more than 25 seconds the motor will shut itself down and wait for communications to be reestablished D Using Motor LED in Troubleshooting The MOTOR LED is connected to the blower motor communication line and works with the fan coil control microprocessor and the STATUS LED to provide fan coil operation and troubleshooting information When the motor is commanded to operate the MOTOR LED will be turned on and will flash each time
37. e careful not to bend coil fins If coil is coated with oil or grease clean it with a mild detergent and water solution Rinse coil with clear water Be careful not to splash water onto insulation Inspect drain pan and condensate drain at same time cooling coil is checked Clean drain pan and condensate drain by removing any foreign matter from pan Flush pan and drain tube with clear water If drain tube is restricted it can generally be cleared by high pressure water Cut plastic line and work outside condensate pan and away from coil to clear drain tube 24 NOTE There MUST be a trap in condensate line Trap must be at least 3 in deep not higher than the bottom of unit condensate drain opening and pitched downward to an open drain or sump A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage Do not use caustic household drain cleaners in the condensate pan or near the coil Drain cleaners can quickly destroy a coil C Blower Motor and Wheel Clean blower motor and wheel when cooling coil is cleaned To clean or service wheel or motor proceed as follows 1 Pull unit disconnect when used and remove blower access panel 2 Disconnect motor electrical leads from control box and ca pacitor Mark location of wires for reassembly 3 Remove the three bolts holding motor mount to blower housing while supporting motor shell with hand 4 Pull motor inlet ring and blower wheel assem
38. econdary side NOTE Transformer is fused Do not short circuit D Fan Relay Relay coil is 24 V Check for proper control voltage Replace relay if faulty CLEANING OR REPLACING REFRIGERANT FLOW CONTROL DEVICE The FFM piston can be removed and cleaned if believed to be plugged This unit s piston is unique and replacements are available from RCD The filter drier should be located on the liquid line at the indoor unit to prevent particulate from plugging the piston SEQUENCE OF OPERATION A Condensing Unit COOLING When thermostat calls for cooling the circuit between R and G is complete and single pole single throw relay FR is energized The normally open contacts close causing blower to operate The circuit between R and Y is also complete This completed circuit causes contactor in outdoor unit to close which starts compressor and outdoor fan HEATING When thermostat calls for heating and FAN switch is set on AUTO the circuit between R and W is complete The heater sequence SEQ 18 is energized which closes contacts of relay There will be a time delay This completed circuit energizes all heating elements HTR and blower motor B Heat Pump COOLING On a call for cooling the thermostat makes circuits R O R Y and R G Circuit R O energizes reversing valve switching it to cooling position Circuit R Y energizes contactor starting outdoor fan motor and compressor Circuit R G energizes indoor unit blower relay st
39. el is removed E If Motor Does Not Run Turn power off wait five minutes and check the following 1 With power turned off check 5 amp fuse on Easy Select Board 2 Check all plugs and receptacles for any deformation or cor rosion that could cause bad connections Be sure plugs are fully seated A CAUTION ELECTRICAL OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation DO NOT remove or apply 5 pin plug on motor with power on Arcing could occur which can damage control module Turn power back on and check the following 3 Check for 24Vac on SEC1 and SEC2 If no voltage is present check transformer 4 Verify that approximately 230Vac is present at motor 5 Verify low voltage control signals to motor according to procedure below Use following procedure to check low voltage signals The ECM motor in these fan coils receive low voltage signals from the Easy Select Board through the wiring harness assembly The combination of pins energized at the motor determines the speed the motor will run The procedure below isolates the fan coil from all external devices such as a thermostat condensing unit humidifier or electronic air cleaner There is also a specific troubleshooting example to demonstrate the process Table 7 provides information needed to verify that the correct voltages are present at the motor and the Easy Select Board THERMOSTAT 1 Remove all thermosta
40. embly to deck with screws previously re moved 9 Reconnect electrical leads to fan coil control 10 Reconnect electrical power to unit and test fan for proper rotation FF1E and FFMA The minimum maintenance requirements for this equipment are as follows 1 Inspect and clean or replace air filter each month or as re quired 2 Inspect cooling coil drain pan and condensate drain each cooling season for cleanliness Clean as necessary 3 Inspect blower motor and wheel for cleanliness each heating and cooling season Clean as necessary 4 Inspect electrical connections for tightness and controls for proper operation each heating and cooling season Service as necessary A CAUTION CUT HAZARD Failure to follow this caution may result in personal injury Sheet metal parts may have sharp edges or burrs Use care and wear appropriate protective clothing and gloves when handling parts A Air Filter The air filter should be replaced as needed A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage Never operate unit without a filter B Cooling Coil Drain Pan and Condensate Drain The cooling coil is easily cleaned when it is dry Inspect coil and clean if necessary before each cooling season To check or clean cooling coil remove blower heater access panel to gain full access to cooling coil If coil is coated with dirt or lint vacuum with a soft brush attachment B
41. ersonal injury or death Puron R 410A systems operate at higher pressures than R 22 systems Do not use R 22 service equipment or components on R 410 equipment Ensure service equipment is rated for R 410 INTRODUCTION The F and PF series fan coil units are designed for flexibility in a variety of applications that meet upflow horizontal or downflow requirements Units are available in 1 1 2 through 5 ton nominal cooling capacities Factory authorized field installed electric heater packages are available in 3 through 30 kilowatts A WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death Before installing or servicing unit always turn off all power to unit There may be more than one disconnect switch Turn off accessory heater power if applicable Lock out and tag switch with a suitable warning label FAN COIL DESCRIPTION AND TROUBLESHOOTING FYS FH4 PF4 even sizes and FF1E even sizes FAN MOTOR The motor is two or three speed direct drive High speed lead is black low speed lead is red and common lead is yellow Be sure proper blower speed has been selected The motor is turned on through two different routes The first occurs when thermostat calls for the fan in cooling heat pump or fan only mode A 24 Vac signal is sent to relay causing relay to close its normally open contacts turning fan on The second occurs when there is a
42. essary as adequate clearance is available 7 Remove blower wheel from housing by removing cutoff plate from blower housing outlet Note wheel orientation and cutoff location for reassembly The blower motor and wheel may be cleaned by using a vacuum with a soft brush attachment 8 Remove grease with a mild solvent such as hot water and detergent Be careful not to disturb balance weights clips on blower wheel vanes Also do not drop or bend wheel as balance will be affected To reassemble blower 1 Place blower wheel back into housing Be sure to position correctly for proper location 2 Reassemble cutoff plate to housing using identified holes from disassembly procedure 3 Position motor and mount in same position as when blower housing was in unit Secure motor mount on housing using removed bolts Make sure mount or motor is grounded to blower housing 4 Locate blower wheel setscrew over flat on motor shaft Ro tate wheel in housing It should not rub housing and should be centered in inlet opening If not loosen setscrew and align as necessary 5 Attach green wire to blower housing with screw 6 If applicable Secure motor capacitor under strap and tighten strap screw 7 Slide blower assembly to blower deck Be sure once blower is within the unit casing to force blower assembly toward control box while sliding assembly into unit to en sure that blower assembly engages deck properly 8 Fasten blower ass
43. f dia phragm The bi flow TXV is used on split system heat pumps In cooling mode TXV operates the same as a standard TXV previously explained However when system is switched to heating mode of operation refrigerant flow is reversed The bi flow TXV has an additional internal check valve and tubing These additions allow refrigerant to bypass TXV when refrigerant flow is reversed with only a 1 psig to 2 psig pressure drop through device When heat pump switches to defrost mode refrigerant flows through a completely open not throttled TXV The bulb senses the residual heat of outlet tube of coil that had been operating in heating mode about 85 F and 155 psig This temporary not throttled valve decreases indoor pressure drop which in turn increases refrigerant flow rate decreases overall defrost time and enhances defrost efficiency PROBLEMS AFFECTING TXV A Low Suction Pressure 1 Restriction in TXV Thermal rod Valve ee 2 Low refrigerant charge 3 Low indoor load 4 Low evaporator airflow B High Suction Pressure 1 Overcharging 2 Sensing bulb not secure to vapor tube 3 High indoor load 4 Large evaporator face area NOTE When installing or removing TXV wrap TXV with a wet cloth When reattaching TXV make sure sensing bulb is in good thermal contact with suction tube 5 The needle valve on pin carrier is s
44. from Easy Select Board Control closes R to G R to Y Y2 and R to O heat pump only and open R to DH Dehumidification is active when 24Vac is removed from DH terminal Unit delivers 20 percent less airflow E SuperDehumidify Mode Thermidisat or Comfort Zone II B indoor control Single Speed Outdoor Unit This mode is only activated by the indoor control when COOL to DEHUMIDIFY and SUPERDEHUMIDIFY are configured at the control and there is a call for dehumidfication without a call for cooling The control closes R to Y Y2 R to O heat pump only and opens R to DH and R to G This signals the fan coil to run at minimum airflow for maximum humidity removal The control will cycle the equipment 10 minutes on and 10 minutes off until satisfied Table 1 Motor and Modules A Required Control Module Model Size Motor Type Current Blower Motor P N Replacement Kit Number FV4B_002 ECM2 3 HD44AE131 RMOD44AE131 FV4B_003 ECM2 3 HD44AE132 RMOD44AE132 FV4B_005 ECM2 3 HD44AE133 RMOD44AE133 FV4B_006 ECM2 3 HD46AE244 RMOD46AE244 FV4C_002 Series A ECM2 3 HD44AR131 RMOD44AR131 FV4C_003 Series A ECM2 3 HD44AR132 RMOD44AR132 FV4C_005 Series A
45. g first stage to turn on W3 and E also receive signal if wired in with W2 If W3 and E are not wired to W2 the sequencers heat relays can be controlled individually to stage additional electric heat The sequence control is described in the following section 1 W2 When thermostat sends a signal to W2 a 24 Vac signal is applied across sequencer relay No 1 causing it to close When sequencer relay No 1 closes first stage of electric heat is energized In straight electric heat fan is also ener gized through the normally closed contacts of fan relay In cooling heat pump or manual fan mode fan will already be running since fan relay would have been energized When thermostat stops calling for electric heat the 24 Vac signal to sequencer relay No 1 turns off and sequencer opens after a delay of 60 to 90 seconds Heaters equipped with relays will be de energized immediately When se quencer relay opens first stage of heat turns off along with fan providing thermostat is not calling for the fan 2 W3 When a signal is sent to W3 a 24 Vac signal to sequencer relay No 2 causes it to close with second stage of electric heat turning on The 24 Vac signal applied to sequencer re lay No 1 causes fan to operate Timing is such that sequen cer relay No 1 will turn on before sequencer relay No 2 When signal to W3 is turned off sequencer relay No 2 opens If W2 is also satisfied first stage of electric heat and fan will also
46. ged with liquid refrigerant Use a commercial type metering device in the manifold hose when charging into suction line with compressor operating e Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low side retard e Use hoses with 700 psig service pressure rating e Leak detectors should be designed to detect HFC refrigerant e R 410A refrigerant as with other HFCs is only compatible with POE oils e Vacuum pumps will not remove moisture from oil e Do not use liquid line filter driers with rated working pressures less than 600 psig e Do not leave R 410A refrigerant suction line filter driers in line longer than 72 hours e Do not install a suction line filter drier in liquid line e POE oils absorb moisture rapidly Do not expose oil to atmosphere e POE oils may cause damage to certain plastics and roofing materials e Wrap all filter driers and service valves with wet cloth when brazing e A factory approved liquid line filter drier is required on every unit e Never open system to atmosphere while it is under a vacuum e When system must be opened for service recover refrigerant evacuate then break vacuum with dry nitrogen and replace filter driers Evacuate to 500 microns prior to recharging e Do not vent R 410A refrigerant into the atmosphere e Observe all warnings cautions and bold text Copyright 2014 CAC BDP e 7310 W Morris St e Indianapolis IN 46231 Edition Date 02 14 U S Export Clas
47. he W and C terminal block connections when electric heaters are used as primary heating source When using a Thermidistat Control Zone Perfect Plus or Comfort Zone II the 24 Vac signal may be source directly from the Thermidistat HUM terminal G FV4 Dehumidify Mode NOTE Humidistat must open on humidity rise Latent capacities for systems using the FK4 FV4 and 40FK fan coils are better than average systems If increased latent capacity is an application requirement the field wiring terminal block provides connection terminals for use of a standard humidistat The FK4 FV4 and 40FK fan coils will detect the humidistat contacts opening on increasing humidity and reduce its airflow to approximately 80 percent of nominal cooling mode airflow This reduction will increase the system latent capacity until the humidity falls to a level which causes the humidistat to close its contacts When the contacts close airflow will return to 100 percent of the selected cooling airflow To activate this mode remove jumper J1 and wire in a standard humidistat Carefully consult product airflow data for cooling and dehumidification modes Table 4 FV4 Motor Control Test Values With 16 pin connector at motor unplugged Med Volt Meter on 16 pin Harness Plug ER d Bo SIE g Voltage R to W1 Pin 2 Pin 1 Pin 7 Pin 9 24Vac R to W2 Pin 13 Pin 1 Pin 4 Pin 9 24Vac R to Y1 Pin 6 Pin 1 Pin
48. ibed in Thermostat section above With all thermostat wires removed from Easy Select Board place a jumper wire between R and Y Y2 low voltage screw terminals on the Easy Select Board 1 Check Table 4 for pin number on 16 pin connector associ ated with the Y Y2 signal The correct pin is No 14 The far 11 right column of Table 4 shows that 12Vdc should be present between Pin No 14 and Pin No 1 common on the 16 pin connector 2 Set meter to read DC voltage Place meter leads between Pins No 1 common and No 14 and check for 12Vdc If signal is present the problem is in the module or motor If signal is not present the problem is either in wiring harness or Easy Select Board These steps can be repeated for other modes of operation To check Easy Select Board 1 Leave jumper wire in place between R and Y Y2 2 Check Table 4 under Volt Meter on Easy Select Board Plug column and row for Pin No 14 on motor plug to see pin number on Easy Select Board that should have voltage The correct pin is No 2 The column on far right will show voltage that should be present between Pin No 2 and Pin No 9 common 3 Place meter leads between Pins No 2 and No 9 on Easy Select Board and check for 12Vdc 4 If voltage is present the wiring harness is bad If not the Easy Select Board is bad Verify Motor Winding Section Before proceeding with module replacement check the following to ensure motor winding sectio
49. ic heaters in exclusion of Smart Heat by examining the functional operation of these heaters DESCRIPTION OF ELECTRIC HEATER COMPONENTS A Limit Switch The limit switch is a temperature sensitive control whose function is to prevent system from overheating in abnormal conditions The temperature settings often vary from heater to heater due to variations in airflow patterns and element radiant heat conditions The devices are sized to remain on line under heat pump conditions 115 air off coil and minimum CFM but trip to prevent outlet air conditions above 200 F or excessive component or duct temperatures The device itself consists of a bimetallic disc which when overheated snaps through to open a normally closed high voltage high current switch When system temperatures cool sufficiently the switch will automatically reset to its closed position Normal failure mode for this switch is open If a limit switch has been determined to be defective NEVER BYPASS THE LIMIT SWITCH When replacing limit switch ensure that it is replaced with a limit switch of identical opening temperature and closing differential Limit switches are typically color coded to identify their range B KFC and KFD Electric Heat Relay KFC and KFD electric heater packages have relays controlling the heater elements instead of sequencers A small rectifier PCB is mounted to each relay which converts the incoming 24 Vac control signal to DC In add
50. ination of terminals on the Easy Select Board which tells the motor what CFM to deliver The following are typical operating modes and the terminals that should be energized on the Easy Select Board NOTE The DH terminal on the Easy Select Board is for dehumidification It is de energized on a call for dehumidification I Variable Speed Motor Logic Sequence The ECM motors in these fan coils are programmed to deliver a variety of airflows The motor goes through COOLING The nominal cooling airflow for these fan coils is 350 CFM per ton Selecting the HI adjust tap increases the airflow to 400 CFM per ton The LO tap decreases airflow to 315 CFM per ton The low adjustment is only active during normal cooling mode Removing the signal from the DH terminal reduces the airflow to 80 percent of cooling airflow Removing the G signal for Superdehumidify reduces the airflow to 50 percent of cooling HEATING The base heat pump only heating airflow is determined by the SYSTEM TYPE selection on the Easy Select Board If HP EFFICIENCY is selected the airflow is the same as Cooling IF HP COMFORT is selected the airflow is 315 CFM per ton The airflow will adjust up if necessary when auxiliary heating is required When both the Y Y2 and W1 or W2 terminals are energized the motor will run the higher of the heat pump or electric heat airflows During Super Comfort Heat mode the indoor control removes the G signal from the board This slows the m
51. instructions are sent to the motor When the motor is commanded to stop the MOTOR LED will be turned off If the MOTOR LED is lit flashing and the motor is running or if the MOTOR LED is off and the motor is stopped operation is normal and no motor fault exists If the MOTOR LED is lit flashing and the motor does not run or if the MOTOR LED is off and the motor is running check the STATUS LED for the Status Code Refer to the troubleshooting instructions for the indicated Status Code in Section E Fan Coil Troubleshooting E Fan Coil Troubleshooting Fan coil faults indicated by flashing codes on the amber system STATUS LED can be resolved using troubleshooting information provided below Codes are listed in order of their priority highest to lowest Though multiple faults can exist at any time only the highest priority code will be displayed on STATUS LED Clearing the indicated fault when multiple faults exist will cause the next highest priority Status Code to be flashed All existing faults as well as a fault history can be viewed at User Interface STATUS CODE 45 CONTROL BOARD TEST FAULT Fan coil control has failed internal start up tests and must be replaced No other service procedure will correct STATUS CODE 37 HEATER OUTPUT SENSED ON WHEN NOT ENERGIZED Fan coil control is provided with circuitry to detect presence of a 24 Vac signal on Electric Heater stage 1 and stage 2 outputs If fan coil control detects
52. ished this should happen within 10 seconds Once communications with User Interface are successful COMM LED will be lit and held on At the same time amber STATUS LED will be lit and held continuously on until a request for operating mode is received The STATUS LED will be on any time fan coil is in idle mode If at any time communications are not successful for a period exceeding two minutes fan coil control will only allow emergency heating or cooling operation using a common thermostat a non communicating outdoor unit and the R C Y O W outdoor unit terminal strip connections and will display Status Code 16 System Communication Fault on amber STATUS LED No further fan coil troubleshooting information will be available at User Interface until communications are re established If COMM LED does not light within proper time period and status code is not displayed 1 Check system transformer high and low voltage to be sure the system is powered 2 Check fuse on fan coil control to be sure it is not blown If fuse is open check system wiring before replacing it to be sure a short does not cause a failure of replacement fuse If COMM LED does not light within proper time period and status code is displayed Check system wiring to be sure User Interface is powered and connections are made A to A B to B etc and wiring is not shorted Mis wiring or shorting of the ABCD communications wiring will not allow successful communica
53. ition to the rectifier circuit the second and third stage relays contain a time on delay circuit of five seconds for second stage and eight seconds for third stage When the control signal is removed from the relays all relays will open with no time off delay TROUBLESHOOTING KFC AND KFD SERIES ELECTRIC HEATERS A Discolored Wire Insulation at Terminal Check quick connect terminal at discoloration Connection may be loose creating a high resistance through connection point B Fuse Failure 1 Check for shorted wire Replace wire Never try to fix wire using electrical tape 2 Check shorted element If element is shorted replace heater C No Heat 1 Check fuse for failure If fuse has failed refer to Fuse Fail ure section 2 Check for faulty transformer Check output voltage of trans former secondary side R red and C brown Make sure output is between 18Vac and 30Vac If output voltage is low and input voltage tests normal replace transformer 3 Check for miswired heater plug harness 4 Check limit switch or sequencer failure These switches should have failed in open position If output voltage is zero volts replace switch 5 Check heater relay and PCB KFC and KFD heaters only Control voltage input to PCB should be 24Vac Output to relay should be 18 Vdc minimum If input is present but no output replace PCB If output is present replace relay D Heater Will Not Turn Off 1 Check low voltage wiri
54. late Assy Louvered Grill Cover is an accessory A14214 Fig 17 FFMA sizes 30 amp 36 Expanded View Case DUCT COMPONENTS 30K amp 36K gt BLOWER amp ELECTRICAL PARTS DUCT COMP NENTS 9 Left Plate 6 Blower Discharge Side Brackets 7 4 Heater Blank OFF Plate Support Bracket 3 Blower Discharge Plate 2 Right Plate 1 Blower Deck ELECTRICAL PARTS 1 Control Mounting Plate 4 84v Transformer 5 G d L enm S 2 Time Delay Relay 6 Copocitor 3 Blower Rela Note This illustratio reference only n is for 7 Capacitor Strap 8 BLOWER 4 Terminal Block A13139 Fig 18 FFMA sizes 30 amp 36 Expanded View Duct Components Blower amp Electrical Parts 21 EVAPORATOR PARTS amp DRAIN PANC30K amp 36K gt 7 Distributor Ass 6 Header Ass 9 Coil 3 Col Airproof Plate 2 Col Support Plate 1 Air Filter Support Plate Note This illustration is for reference only 11 Drain Plu II le Drain Pan B Piston Installed 8 Throttle 9 Distributor s10 Capillary 13 Coil Roof Plate A13140 Fig 19 FFMA sizes 30 amp 36 Expanded View Evaporator Parts amp Drain Pan ELECTRIC HEATER FUNCTION AND TROUBLESHOOTING FB4 FE4 FF1E FH4 FV4 FX4 and PF4 This section describes KFC and KFD series electr
55. ll fitting panel and reconnect clip securing fitting panel to condensate drain pan 17 Horizontal Applications Only Reinstall horizontal pan clip and secure with 1 screw See Fig 23 18 Reinstall coil access panel 19 Reconnect liquid and vapor refrigerant lines and condensate drain line Install new filter drier s NOTE If a torch is used to unbraze the line set protect the fitting panel with a wet cloth or braze shield as necessary 20 Evacuate line set and indoor coil to 500 microns back seat open liquid and vapor service valves 21 Turn on electrical supplies to indoor and outdoor units 22 Check system refrigerant charge and operation See Split System Residential Air Conditioners and Heat Pump Service Manuals for further information 28 COIL SUPPORT COLUMN COIL TOP SEAL PARTIALLY HIDDEN a COIL TO CASING SCREW SV DISTRIBUTOR NG TUBE EXPANSION A N AI SCREW PAN TO COIL LIQUID TUBE FIELD CONNECTION COLUMN 4 CONDENSATE PAN A98008 Fig 24 Slope Coil Component Location Prior to 1996 INSTALLATION SLOPE COIL UNITS ONLY 1 Recover system refrigerant a Attach gage manifold set to service valves b Start unit in cooling mode c Front seat close liquid line service valve d Operate unit until vapor pressure reaches 5 psig 35kPa or until suction line LPS opens e Turn off electrical supply to outdoor unit f Front seat close v
56. lt z Ri E is C2 C1 e FO DZ uo O 2D oo LR40061 CESO130003 01 AG HSCI muwi FAN RELAY Check 208 V and 230 V transformer connections They may be miswired LOW VOLTAGE FUSE PCB BLOCK WIRING A97020 Fig 1 Fan Coil Printed Circuit Board CES013003 00 01 HK61EA002 LR40061 A03010 Fig 2 Fan Coil Printed Circuit Board HK61EA006 4 WARNING ELECTRIC SHOCK HAZARD FF1E CONTROL BOX A13032 Fig 3 Electric Heater Control Box FB4C FX4D PF4 odd sizes and FFIE odd sizes FAN MOTOR The multi speed ECM motor used with this product contains two parts the control module and the motor winding section Do not assume the motor or module is defective if it will not start Go through the steps described below before replacing control module or entire motor The control module is available as a replacement part A It is normal for the motor to rock back and forth on startup Do not replace the motor if this is the only problem identified B If the motor is not running 1 Check for proper high voltage and ground at the L
57. n is functional With control module removed and unplugged from winding section 1 The resistance between any two motor leads should be sim ilar 2 The resistance between any motor lead and the unpainted motor end plate should be greater than 100 000 ohms If motor winding fails one of these tests it is defective and must be replaced F Accessories AUXILIARY TERMINALS The AUX and HUM terminals on the Easy Select Board are tied directly to the G terminal and provide a 24 Vac signal whenever the G terminal is energized See Fig 8 During Superdehumidify mode the G signal is not present and the auxiliary terminals are not energized If the installation includes the use of this operating mode do not use these terminals to control accessories See Electronic Air Cleaner and Humidifier sections for further information ELECTRONIC AIR CLEANER CONNECTIONS The AUX1 and AUX2 terminals are not always energized during blower operation as described above When using an electronic air cleaner with the FV4 fan coil use Airflow Sensor The airflow sensor turns on electronic air cleaner when the fan coil blower is operating HUMIDIFIER HUMIDISTAT CONNECTIONS Easy Select Board terminals HUM1 and HUMZ are provided for direct connection to the low voltage control of a humidifier through a standard humidistat These terminals are energized with 24Vac when G thermostat signal is present Alternately the 24 Vac signal may be sourced from t
58. ng for miswire 2 Check for shorted elements to ground 3 Replace sequencer relays They may be stuck closed E Nuisance Trips 1 Check for low airflow due to dirty filters blocked registers or undersized duct 22 2 Check blower motor and wheel for proper operation Ex cessive current draw of motor will cause internal overload to trip 3 The fan speed may be low FFM This section describes EHK2 series electric heaters by examining functional operation of this heater Service can be completed with heater in place Shut off power before servicing DESCRIPTION OF ELECTRIC HEATER COMPONENTS A Limit Switch The limit switch is a temperature sensitive control that s function is to prevent system from overheating in abnormal conditions The temperature settings often vary from heater to heater due to variations in airflow patterns and element radiant heat conditions The devices are sized to remain on line under heat pump conditions 115 F air off coil and minimum CFM but trip to prevent outlet air conditions above 200 F or excessive component or duct temperatures The device itself consists of a bimetallic disc which when overheated snaps through to open a normally closed high voltage high current switch When system temperatures cool sufficiently the switch will automatically reset to its closed position Normal failure mode for this switch is open If a limit switch has been determined to be defective NEVER
59. not be overridden In units built after 0101A the off delay on any W call is one minute and cannot be overridden Some power stealing thermostats could bleed enough voltage to cause motor to run slowly when there is no heating or cooling call Disconnect thermostat wires and wait two minutes to see if motor stops If it stops replace thermostat or install resistor per thermostat installation instructions Motor Will Not Start See following section Troubleshooting ECM2 3 5 0 Motor and Controls C Troubleshooting ECM2 3 5 0 Motor and Controls 4A CAUTION ELECTRICAL OPERATIONS HAZARD Failure to follow this caution may result in equipment damage or improper operation High voltage is always present at motor Disconnect power to unit before removing or replacing connectors or servicing motor Wait at least five minutes after disconnecting power before opening motor The ECM ICM motor used with this product contains two parts the control module and the motor winding section Do not assume the motor or module is defective if it will not start Go through the steps described below before replacing control module Easy Select Board or entire motor The control module is available as a replacement part D If Motor Turns Slowly 1 It is normal operation to run noticeably slower if G terminal is not energized in cooling or heat pump heating modes 2 Attach blower access panel Motor may appear to run slowly if access pan
60. ntrol are operating properly do not replace 2 Check to be sure that the blower wheel is not rubbing the housing 3 Check motor to be sure that the motor shaft is not seized motor control module must be removed and electronics disconnected from windings to perform this check prop erly 4 Check motor windings section following instructions in Section C ECM Motor Troubleshooting If all these checks are normal the motor control module may need replacement STATUS CODE 16 SYSTEM COMMUNICATION FAULT If at any time system communications are not successful for a period exceeding two minutes the fan coil control will only allow emergency heating or cooling operation using a common thermostat a non communicating outdoor unit and the R C Y O W outdoor unit terminal strip connections and will display Status Code 16 on the amber STATUS LED see section E Emergency Heating and Cooling Modes No further fan coil troubleshooting information will be available at the User Interface until communications are reestablished Check system wiring to be sure the User Interface is powered and connections are made A to A B to B etc and wiring is not shorted Mis wiring or shorting of the ABCD communications wiring will not allow successful communications Correcting wiring faults will clear the code and reestablish communications Shorting or mis wiring the low voltage system wiring will not cause damage to fan coil control or to User In
61. o support columns 13 Install new coil pan assembly into unit and secure with one screw previously removed from unit casing See Fig 24 14 Reinstall coil access panel 15 Reconnect liquid and vapor refrigerant lines and condensate drain line Install new filter drier s NOTE Ifa torch is used to unbraze the line set protect the fitting panel with a wet cloth or braze shield as necessary 16 Evacuate line set and indoor coil to 500 microns back seat open liquid and vapor service valves 17 Turn on electrical supplies to indoor and outdoor units 18 Check system refrigerant charge and operation See Split System Residential Air Conditioners and Heat Pump Service Manuals for further information BLOWER ASSEMBLY LAS SUPPORT RAIL COIL TO PAN SCREW sores Vy tz DRAINPAN BOTH SIDES REFRIGERANT CONNECTIONS A98007 Fig 25 Slope Coil Component Location 1996 and Later 29 R 410A QUICK REFERENCE GUIDE e R 410A refrigerant operates at 50 70 percent higher pressures than R 22 Be sure that servicing equipment and replacement components are designed to operate with R 410A refrigerant e R 410A refrigerant cylinders are rose colored e Recovery cylinder service pressure rating must be 400 psig DOT 4BA400 or DOT BW400 e R 410A refrigerant systems should be char
62. on may result in personal injury Sheet metal parts may have sharp edges or burrs Use care and wear appropriate protective clothing and gloves when handling parts FILTER ASSEMBLY To clean or replace air filter push plastic connectors toward center of unit and remove filter access panel outward Push filter up and back into unit Then slide filter out Clean filter by using cold water and mild detergent Rinse and allow filter to dry No oiling or coating of filter is required New filters are available from your local distributor Place filter in slot with cross mesh binding up or facing cooling coil and replace filter access panel COOLING COIL DRAIN PAN AND CONDENSATE DRAIN The cooling coil is easily cleaned when it is dry Inspect the coil and clean if necessary before each cooling season To check or clean cooling coil remove coil access panel If coil is coated with dirt or lint vacuum it with a soft brush attachment Be careful not to bend coil fins If coil is coated with oil or grease clean it with a mild detergent and water solution Rinse coil thoroughly with clear water Be careful not to splash water on insulation Inspect drain pan and condensate drain at the same time cooling coil is checked Clean drain pan and condensate drain by removing any foreign matter from pan Flush pan and drain tube with clear water 23 If drain tube is restricted it can generally be cleared by high pressure water Cut pla
63. ondary can not supply the 24 V signal to energize fan relay If trans former is receiving correct primary voltage but is not put ting out correct secondary voltage transformer needs to be replaced B If Electric Heat Stages Will Not Turn On But Fan Will Turn On IF THERE IS NO HIGH VOLTAGE TO TRANSFORMER 1 Check plug connection between heaters and board This supplies power to transformer and fan Be sure plug is con nected properly 2 Check sequencer relay No 1 and plug wiring Yellow wire should be connected to Pin No 9 of plug and to limit switch Black wire should be connected to Pin No 7 of plug and to sequencer relay No 1 3 Check incoming high voltage power leads If these are not receiving power system cannot function IF TRANSFORMER HAS VOLTAGE APPLIED TO IT 1 Check low voltage transformer leads R red and C brown Make sure they are wired to correct location The unit will not function without proper connections 2 Check output voltage of transformer secondary side R red and C brown If transformer output is low less than 18Vac refer to items 3 and 4 of previous If Transformer Has High Voltage Applied To It section IF TRACES ARE OVERHEATED ON BACK OF PCB Usually whenever a trace is blown on PCB it means either there has been a high voltage short or high voltage has been applied to low voltage circuit This can be prevented by making sure PCB is wired correctly before PCB has power applied
64. oner selection approximately 315 CFM ton in heating mode In cooling mode supplies 350 CFM ton 3 HP EFF provides same airflow for heat pump heating and cooling modes approximately 350 CFM ton The factory setting is AC See Fig 7 D AC HP CFM Adjust Select low nominal or high airflow The factory selection is NOM The adjust selections HI LO will regulate airflow supplied for cooling and heat pump heating modes only 15 percent and 10 percent respectively The adjust selection options are provided to adjust airflow supplied to meet individual installation needs for such things as noise comfort and humidity removal See Fig 7 E ON OFF Delay NOTE ON OFF Delay is active only in cooling and heat pump only heating modes In auxiliary heat mode or emergency heat mode the ON delay is 0 seconds and the OFF delay is fixed and cannot be overridden Select desired time delay profile Four motor operation delay profiles are provided to customize and enhance system operation See Fig 7 The selection options are 1 The standard 90 seconds off delay factory setting 0 90 2 No delay option used for servicing unit or when a thermo stat is utilized to perform delay functions 0 0 3 A 30 seconds on 90 seconds off delay profile used when it is desirable to allow system coils time to heat up cool down prior to airflow This profile will minimize cold blow in heat pump operation and could enhance system efficiency 3
65. onnector Pin 4 Pin5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 Pin 11 Pin 12 Heater Connection 12 Pin Common to screw terminal G Common to screw terminal Y Y2 through diode D3 Common through Y1 through diode D2 Common to W2 screw terminal Common to W2 screw terminal Common to W1 screw terminal Common to W1 screw terminal R 24Vac Common to transformer C Common to transformer C Common to transformer C Common to DH screw terminal Description Table 3 Typical Operating Modes Operating Mode Terminals Energized Heat Pump Only Heating R Y Y2 G DH Heat Pump Only Heating Super Comfort Heat Mode R Y Y2 DH Heat Pump Heating Auxiliary Heat non staged R Y Y2 G DH W2 Cooling R Y Y2 G DH O Cooling Dehumidification R Y Y2 G O Cooling Superhumidification R Y Y2 O F Heat Pump Heating Mode Single Speed or Two Speed High Thermostat closes R to Y Y2 and R to G A circuit R to Y1 is required for two speed high operation The unit delivers airflow selected by AC HP SIZE selection and CFM ADJUST selection Selected delay profile is active in this mode G Heat Pump Heating Mode 2 Speed Low Thermostat closes R to G and R to Y1 Unit delivers two speed low airflow for AC HP SIZE and CFM ADJUST selected Selected delay profile is active in this mode H Non Staged Auxiliary with Heat Pump Heating Mode Thermostat should already have closed R
66. opening as this will affect operation 5 Install new or cleaned piston into body 6 Replace seal ring on retainer 7 The threads are coated with Loctite Heavy Duty Anti Seize It is recommended to reapply with the same thread sealer 8 Reconnect refrigerant tube to piston body 9 Pressurize tubing and coil then leak check 10 Evacuate tubing and coil as necessary A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution could result in equipment damage Use a backup wrench and do not over tighten as deformation of the piston body will occur causing the piston to lodge in a partially open or closed position LIQUID TUBE STRAINER In R 22 all units the TXV and refrigerant flow control device is protected on the indoor coil by a wire mesh strainer It is located inside the 3 8 in liquid tube at field braze joint just outside unit casing Access to strainer is through field braze joint ALUMINUM COIL REPAIR Repairing leaks on aluminum coils is possible using the aluminum brazing method Specific braze and flux material designed for aluminum are necessary for aluminum brazing A kit containing all materials necessary for making and aluminum braze repair is available through Replacement Components kit No 337748 751 Do not use a previously used wire brush to clean copper when preparing an aluminum braze site Copper particles in contact with an aluminum coil may cause premature failure Service alumin
67. otor to 75 percent of heat pump airflow If the CFM adjust is set to LO it will deliver 67 5 percent of heat pump airflow during Super Comfort Heat mode TROUBLESHOOTING A Troubleshooting Easy Select Board FV4 If Traces Are Overheated on Back of PCB Usually whenever there is a trace broken on PCB it means either there has been a high voltage short or high voltage has been applied to low voltage circuit This can be prevented by making sure PCB is wired correctly before fan coil has power applied to it If PCB Fuse Keeps Blowing When low voltage fuse blows it means transformer would have blown if fuse had not been in circuit to protect it The fuse usually blows when there is a high current drawn on transformer high voltage applied to low voltage circuit or a direct secondary short When there is a high current drawn on transformer it is most likely because transformer has been shorted or system is trying to draw more Vac than transformer rating allows When fuse blows because of high voltage the system has mixed high and low voltage signals 1 Check transformer and thermostat wiring See Fig 7 Be sure transformer is not shorting out because thermostat wires are miswired 2 Check wiring of relays See Fig 7 Be sure low voltage and high voltage wiring are connected to proper sequen cers 3 Check VA draw on transformer If VA draw is more than VA rating of transformer fuse will blow If this is the case replace t
68. pring loaded which also exerts pressure on underside of diaphragm via push rods which closes valve Therefore bulb pressure equals evapor ator pressure at outlet of coil plus spring pressure If load increases temperature increases at bulb which increases pressure on topside of diaphragm which pushes pin carrier away from seal opening valve and increasing flow of refri gerant The increased refrigerant flow causes increased leav ing evaporator pressure which is transferred via the equal izer tube to underside of diaphragm with which the pin carrier spring pressure closes valve The refrigerant flow is effectively stabilized to load demand with negligible change in superheat ALUMINUM COIL UNIT TXV s The distributor used on the all aluminum coils is also made of aluminum The TXV connection to the distributor is accomplished with a 3 4 in Chatleff nut See Fig 21 The threads are coated with Loctite Heavy Duty Anti Seize which is a graphite calcium fluoride formulation for applications that is free from copper lead and sulfur This product is typically used in applications with an operating range of 20 F to 2400 F When replacing a TXV it is recommended to reapply with the same thread sealer Extra care should be taken during brazing of copper equalizer on the aluminum coils to prevent the braze material from splattering on the aluminum Also route the copper equalizer so that it doesn t touch the aluminum components
69. ransformer with one that has a higher VA rating B Troubleshooting Common Problems Airflow Too Low Y1 instead of Y Y2 on single speed air conditioner or heat pump application Y1 input is only for two speed applications Using this terminal will deliver about 60 percent of full cooling airflow 10 Wrong Easy Select Board selection Selecting an outdoor unit or electric heater smaller than actually installed will result in low airflow for the application G not energized with call for cooling or heating This triggers Super Comfort Heat or SuperDehumidify mode which delivers 50 percent of cooling airflow J1 jumper pulled with no thermidistat or dehumidistat installed The J1 jumper ties the DH terminal to R and is installed at the factory When pulled a Thermidistat or dehumidistat supplies a 24 V signal to DH when there is no call for dehumidification reverse logic When there is no signal on DH the motor reduces airflow to 80 percent for better dehumidification Airflow Too High Wrong Easy Select Board selection Fan coil is factory set for the largest outdoor unit and largest electric heater Select sizes that are actually installed Continuous fan set too high for two speed applications Set to MED or LO Motor Will Not Stop Allow time for off delay to time out In units built before serial number 0101A any W call will have a two minute off delay independent of delay selection This is programmed into the motor and can
70. s energized because first ON is last OFF This ensures fan remains ON until the last heater de energizes CARE AND MAINTENANCE FB4 FEA FH4 FV4 FX4 and PF4 To continue high performance and minimize possible equipment failure it is essential periodic maintenance be performed on this equipment The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools The only consumer service recommended or required is filter maintenance See Filter A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Assembly Disconnect all power to the unit before servicing the field wires or removing the control package The disconnect when used on the access panel does not disconnect power to the line side of the disconnect but does allow safe service to all other parts of the unit The minimum maintenance requirements for this equipment are as follows 1 Inspect and clean or replace air filter each month or as re quired 2 Inspect cooling coil drain pan and condensate drain each cooling season for cleanliness Clean as necessary 3 Inspect blower motor and wheel for cleanliness each heating and cooling season Clean as necessary 4 Inspect electrical connections for tightness and controls for proper operation each heating and cooling season Service as necessary A CAUTION CUT HAZARD Failure to follow this cauti
71. screws and motor ground lead secured to blower housing or erratic motor operation can result Transformer Motor and Electric Heater Power Connection Transformer high voltage supplied from electric heater package or high voltage leads through 12 pin heater connector plug recp2 The ECM2 3 5 0 power connections are made at the transformer primary terminals The transformer secondary connections are made at SEC1 and SEC2 connectors PCB LAYOUT AND DESCRIPTION FV4 NOTE Layout of actual PCB is depicted in Fig 7 The Easy Select Board is the interface between the ECM motor and other system components The board offers choices of electric heater size outdoor unit size and type comfort or efficiency settings on and off delay profiles and continuous fan speed The installer should select the correct size of components that are being installed in each installation If no selections are made the factory default settings are for the largest heater largest outdoor unit AC system type nominal airflow adjust and 0 90 time delay NOTE Outdoor unit model should have an AHRI rating with the variable speed fan coil Some outdoor unit models will not work properly with this fan coil Power for system is supplied from a 230 Vac 60 Hz line Class 2 voltage 24 Vac nom used for thermostat connections is derived from transformer located in close proximity to PCB The 24 Vac secondary circuit includes 5 amp automotive type fuse in SECZ circui
72. sification EAR99 Catalog No SM FANCOIL 03 Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations Replaces SM FANCOIL 02 30
73. size for example 0 10 for a 10 kW heater This airflow must be greater than the minimum CFM for electric heater application with the size system installed for safe and continuous operation Note that airflow marked is the airflow which will be supplied in emergency heat mode and heating mode on air conditioners when electric heat is primary heating source To ensure safe heater operation in heat pump heating mode when electric heaters are energized the ECM2 3 5 0 will run the higher of heat pump airflow and electric heater airflow The factory default selection is largest heater range approved See Fig 7 B AC HP Size The factory default setting for air conditioner or heat pump size is largest unit meant for application with model of fan coil purchased The installer needs to select air conditioner or heat pump size to ensure that airflow delivered falls within proper range for size of unit installed in all operational modes See Fig 7 Unpack unit and move to final location Remove carton taking care not to damage unit Inspect equipment for damage prior to installation File claim with shipping company if shipment is damaged or incomplete Locate unit rating plate which contains proper installation information Check rating plate to be sure unit matches job specifications C System Type The type of system must be selected 1 AC air conditioner approx 350 CFM ton 2 HP COMFORT provides lower airflow than air condi ti
74. stic line and work outside condensate pan and away from coil to clean drain tube A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage Do not use caustic household drain cleaners in the condensate pan or near the coil Drain cleaners can quickly destroy a coil BLOWER MOTOR AND WHEEL Clean blower motor and wheel when cooling coil is cleaned A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Disconnect electrical power before removing any access panels Lock out and tag switch with a suitable warning label To clean blower motor or blower wheel 1 Remove blower access panel 2 Remove motor leads from fan coil control Note lead loca tion for ease of reassembly 3 Remove the two outside screws holding blower motor as sembly against blower deck flange and slide assembly out of cabinet 4 If applicable Remove screw in strap holding motor capa citor to blower housing and slide capacitor out from under strap Remove screw with green wire from blower housing Mark blower wheel motor and motor support in relation to blower housing before disassembly to ensure proper reas sembly Note position of blades on wheel 5 Loosen setscrew holding blower wheel onto motor shaft 6 Remove the three bolts holding motor mount to blower housing and slide motor and mount out of housing Further disassembly should not be nec
75. t Connection to heater panel is made through 12 pin connector PL 1 Connections to thermostat are made at screw terminals Twenty one pin terminals comprise field select taps for motor Fuse Data 5 amp automotive type ATC ATO tan 32V 200 percent current opening time of five seconds maximum Electrical Connections Twenty one 0 110 in pin terminals are used to provide programming selections for operating modes of ECM2 3 5 0 The 6 selection modes are listed below For additional information refer to Easy Select Configuration Taps section AUX Heat Range Violet Wire AC HP Size Blue Wire Type Orange Wire AC HP CFM Adjust Black Wire AC HP Time Delay Grey Wire Continuous Fan Yellow Wire SEQUENCE OF OPERATION FV4 A Continuous Fan Mode The thermostat closes circuit R to G The unit delivers the airflow selected for fan only operation B Cooling Mode Single Speed or Two Speed High Thermostat closes circuits R to G R to Y Y2 and R to O heat pump only A circuit R to Y1 is required for two speed high operation Airflow delivered the airflow selected by AC HP SIZE selection and CFM ADJUST selection C Cooling Mode Two Speed Low Thermostat closes R to G and R to Y1 and R to O heat pump only Unit delivers two speed low airflow for AC HP SIZE and CFM ADJUST selected D Cooling Dehumidify Mode Thermidistat or Comfort Zone II B and Single Speed Outdoor Unit Installed J1 jumper must be pulled
76. t and accessory wires from Easy Se lect Board 2 On Easy Select Board jumper screw terminals 1 at a time R G R Y Y2 R Y1 R W1 R W2 If motor runs in all cases check thermostat outputs Thermostat wires may be broken or thermostat may be miswired configured incor rectly or defective If the motor does not run or runs in some cases but not others continue this procedure to check wiring harness and circuit board WIRING HARNESS 1 Remove 16 pin plug from motor 2 Check for appropriate voltages on 16 pin connector with screw terminals jumpered See Table 2 3 If signals check correctly and motor does not run inspect wiring harness for loose pins or damaged plastic that could cause poor connections 4 If connections are good either control module or motor is defective 5 If proper signals are not present check circuit board using procedure below 12 PIN PLUG PL 1 ON EASY SELECT BOARD 1 Completely disconnect wire harness from Easy Select Board 2 Jumper the screw terminals one at a time R G R Y Y2 R Y1 R W1 R W2 and check for appropriate voltages on the Easy Select Board pins If proper signals are not present replace Easy Select Board If proper signals are present at the pins and not at 16 pin connector to the motor the wir ing harness is defective TROUBLESHOOTING EXAMPLE Motor is not running on a call for heat pump heating after jumpering the Easy Select Board screw terminals as descr
77. terface but may cause the low voltage fuse to open STATUS CODE 46 BROWNOUT CONDITION If the secondary voltage of the transformer falls below 15Vac for a period exceeding four seconds Status Code 46 will be displayed on STATUS LED If system includes a non communicating outdoor air conditioner or heat pump the User Interface will command the fan coil to turn off Y output controlling compressor When secondary voltage rises above 17Vac for more than four seconds the brownout condition is cleared and normal system operation will resume subject to any minimum compressor off delay function which may be in effect Brownout does not affect blower or electric heater operation STATUS CODE 53 OUTDOOR AIR TEMPERATURE SENSOR FAULT If an OAT sensor is found at power up input is constantly checked to be within a valid temperature range If sensor is found to be open or shorted at any time after initial validation Status Code 53 will be displayed at amber STATUS LED Check for faults in wiring connecting sensor to OAT terminals Using an Ohmmeter check resistance of thermistor for a short or open condition If thermistor is shorted or open replace it to return the system to normal operation If fault is in the wiring connections correcting the fault will clear the code and return the system to normal operation NOTE If fault condition is an open thermistor or a wiring problem that appears to be an open thermistor and the power to the
78. tion LEDs built into fan coil control provide installer or service person information concerning operation and or fault condition of the fan coil control and ECM motor This information is also available at System User Interface in text with basic troubleshooting instructions Careful use of information displayed will reduce the need for extensive manual troubleshooting The amber LED located at bottom center of control adjacent to motor harness plug is Motor Status LED and it is labeled MOTOR A second amber LED located in upper right center of control adjacent to System Communications connector A B C D is the System Status LED and it is labeled STATUS The green LED labeled COMM is also located adjacent to System Communications connector below STATUS LED and is used as an indicator of system communications status Status Codes will be displayed on the STATUS LED using the following protocol 1 The number of short flashes indicates first digit of code 2 The number of long flashes indicates second digit of code 3 A short flash is 0 25 seconds on A long flash is one second on 4 The time between flashes is 0 25 seconds 5 The time between last short flash and first long flash is 1 second 6 The LED will be off for 2 5 seconds before repeating code B Fan Coil Control Start Up and System Communications Troubleshooting On power up green COMM LED will be turned off until successful system communications are establ
79. tions NOTE Shorting or mis wiring low voltage system wiring will nof cause damage to fan coil control or User Interface but may cause low voltage fuse to open C ECM Motor Troubleshooting The ECM motor used in this product consists of two parts the control module and the motor winding section Do not assume motor or module is defective if it will not start Use the designed in LED information aids and follow troubleshooting steps described below before replacing motor control module or entire motor Motor control module is available as a replacement part 13 POWER CONNECTOR PL14 CONTROL CONNECTOR PL13 a ui iL n ul 2 lt io z o a 4d IBEFORE OPENING MOTOR Ig OOD NUD LI A12231 Fig 11 FE4A ECM3 0 Motor VERIFY MOTOR WINDING SECTION A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death or possible equipment damage After disconnecting power from the ECM motor wait at least five minutes before removing the control section Internal capacitors require time to discharge Minor injury from electrical shock may result from early contact with live metal parts Before proceeding to replace a motor control module 1 Check motor winding section to be sure it is functional 2 Remove motor control module section and unplug winding plug Motor shaft should turn freely resistance between any two motor leads should be similar an
80. tors used a printed circuit board similar to the PSC models The current fan coils do not use the printed circuit board and rely on the motor control programming to provide the off delay timing Another design aspect of the control board was to provide a resistor in the G circuit in case a power stealing thermostat was used This resistor is no part of the wiring harness as shown on wiring diagram The resistor is a 2 watt 1500 ohm resistor If the resistor has failed open a likely cause is due to the power stealing thermostat Connecting C common may resolve the issue Having an open resistor should not affect the operation of the motor Fan Speed Selection The fan speed selection is done at the motor connector Units with or without electric heaters require a minimum CFM Refer to the unit wiring label to ensure that the fan speed selected is not lower than the minimum fan speed indicated To change motor speeds disconnect the BLUE fan lead from motor connector terminal No 2 factory default position and move to desired speed tap 1 2 3 or 5 Speed taps 1 2 and 3 have a 90 second blower off time delay pre programmed into the motor Speed tap 4 is used for electric heat only with 0 second blower time delay and the WHITE wire should remain on tap 4 Speed tap 5 is used for high static applications but has a O second blower time delay pre programmed into the motor See Airflow Performance tables for actual CFM Also
81. turn off providing thermostat is not calling for the fan 3 E When thermostat sends a signal to E a 24 Vac signal is sent to sequencer relay No 3 The 24 Vac signal applied to se quencer relay No 3 turns on third stage of electric heat The 24 Vac signal applied to sequencer relay No 1 turns on first stage of electric heat and fan When thermostat stops calling for electric heat the signal to sequencers relays 1 2 and 3 are turned off and sequencers relays open This causes electric heat to turn off with fan providing thermo stat is not calling for the fan NOTE Electric heaters are factory wired with all stages tied together If independent staging is desired consult outdoor thermostat installation instructions or corporate thermostat instructions TROUBLESHOOTING THE PRINTED CIRCUIT BOARD CES013000 00 01 HK61EA002 HK61EA006 Use wiring schematics shown in Fig 1 and Fig 2 as a guide in troubleshooting PCB unless otherwise noted A If Fan Will Not Turn On from Thermostat IF THERE IS NO HIGH VOLTAGE TO TRANSFORMER 1 Check plug receptacle connection This supplies power from heaters to PCB Fan Relay Be sure plug is connected properly 2 Check sequencer relay No 1 and plug wiring Yellow wire should be connected to Pin No 9 of plug and to limit switch Black wire should be connected to Pin No 7 of plug and to sequencer relay No 1 3 Check field power leads L1 and L2 If these are not receiv ing po
82. um coils are also available as a coil repair option 27 Cond Trough TXV _ Support Horizontal Condensate Pan amp Coil Bracket 4 per unit Coil Top Seal Delta Plate Pd Pan Shield 2 per unit Strainer Y Bop _ Rubber Plug Rubber Plug Screws ae Delta Plate To Pan 4 per unit Vertical Condensate Pan A13359 Fig 23 A Coil Component Location COIL amp CONDENSATE PAN REMOVAL AND REPLACEMENT FB4 FE4 FX4 AND FV4 INSTALLATION A COIL UNITS ONLY 1 Recover system refrigerant d Attach gage manifold set to service valves e Start unit in cooling mode f Front seat close liquid line service valve g Operate unit until vapor pressure reaches 5 psig 35kPa or until suction line LPS opens h Turn off electrical supply to outdoor unit i Front seat close vapor service valve j Recover any remaining refrigerant NOTE All condenser coils hold only a factory supplied amount of refrigerant Excess refrigerant such as in long line applications may cause compressor internal pressure relief valve to open indicated by sudden rise in vapor pressure before refrigerant is recovered If this occurs turn off electrical supply to outdoor unit immediately front seat close vapor service valve and recover any remaining refrigerant 2 Turn off electrical supply to indoor unit 3 Disconnect condensate drain line A CAUTION PERSONAL INJ
83. wer system cannot function IF TRANSFORMER HAS HIGH VOLTAGE APPLIED TO IT 1 Check low voltage transformer leads R red and C brown Be sure they are wired to correct locations 2 Check output voltage of transformer secondary side R red and C brown Be sure transformer output is between 18Vac and 30Vac If transformer output is incorrect and transformer is receiving correct input voltage 208V or 230V then transformer needs to be replaced with recom mended transformer If no problem exists with transformer secondary proceed to items 3 and 4 3 Check low voltage fuse shown in Fig 1 or Fig 2 If fuse is blown replace it with an identical 5 amp fuse The trans former cannot supply power to board with fuse blown or loose If fuse blows when unit has power applied to it the system most likely has one of the following problems a Check all 24 V wiring for an electrical short b The maximum load on transformer is 40 VA If load on transformer is excessive the low voltage 5 amp fuse will blow to protect transformer If load exceeds VA rating of transformer a larger VA rated transformer needs to be in stalled Check sequencers relays for excessive current draw c Check wiring of heaters If a heater is miswired fuse may blow If a heater is miswired correct miswiring by compar ing it to heater wiring label 4 Check connections on primary side of transformer If they are not connected properly the transformer sec
84. your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with kits or accessories when installing Follow all safety codes Wear safety glasses protective clothing and work gloves Have a fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit Consult local building codes and the current editions of the National Electrical Code NEC NFPA 70 In Canada refer to the current editions of the Canadian Electrical Code CSA C22 1 Recognize safety information This is the safety alert symbol A When you see this symbol on the unit and in instruction manuals be alert to the potential for personal injury Understand the signal words DANGER WARNING and CAUTION These words are used with the safety alert symbol DANGER identifies the most serious hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation A WARNING UNIT OPERATION AND SAFERTY HAZARD Failure to follow this warning could result in p

Service and Maintenance Instructions

Contents

Download Pdf Manuals

Related Search

Related Contents