Lennox International Inc. 4HP18LT User's Manual
Contents
1. 1 Rotate fan to check for frozen bearings or binding 2 Inspect all factory and field installed wiring for loose connections 3 After evacuation is complete open liquid line and suction line service valves to release refrigerant charge contained in outdoor unit into system 4 Replace the stem caps and secure finger tight then tighten an additional 1 6 of a turn 5 Check voltage supply at the disconnect switch The voltage must be within the range listed on the unit nameplate If not do not start equipment until the power company has been consulted and the voltage condition corrected 6 Set thermostat for cooling demand turn on power to indoor blower and close the outdoor unit disconnect switch to start the unit 7 Recheck unit voltage with unit running Power must be within range shown on unit nameplate Refrigerant Charging This system is charged with R410A refrigerant which operates at much higher pressures than R 22 The liquid line drier provided with the unit is approved for use with R410A Do not replace it with one designed for use with R 22 This unit is NOT approved for use with coils which use capillary tubes as a refrigerant metering device R410A refrigerant cylinders are rose colored Refrigerant should be added through the suction valve in the liquid state Certain R410A cylinders are identified as being equipped with a dip tube These allow liquid refrigerant to be drawn from the bottom of t2. 2 Atthe same time record the liquid line pressure reading 3 Use the temperature pressure chart Table 5 to determine the saturation temperature for the liquid line pressure reading 4 Subtract the liquid line temperature from the saturation temperature according to the chart to determine subcooling Page 14 R410A Temperature Pressure Chart saturation Temperature F Liquid Line Temperature F Pressure Psig Pressure Psig Pressure Psig Temp Temp Temp Subcooling Value F N 100 8 4 214 0 116 396 0 nisi 777 aie 5 Compare the subcooling value with those shown in Table 220 9 118 406 7 7 f subcooling is greater than shown recover some 224 4 119 412 2 refrigerant If subcooling is less than shown add some 417 7 refrigerant 102 9 E 105 0 107 1 109 2 228 0 111 4 E 231 6 423 2 113 6 235 3 428 8 115 8 oj of of oj oj o NJ x N N 239 0 w 434 5 Subcooling Values 118 0 242 7 440 2 120 3 246 5 N o 445 9 A N 122 6 250 3 451 8 w 125 0 254 1 457 6 127 3 258 0 463 5 129 7 A 262 0 N 469 5 SM Table 6 481 6 132 2 266 0 w o A 1 134 6 270 0 A 137 1 274 1 487 8 A 139 6 278 2 494 0 a
3. 142 2 282 3 w 500 2 a 144 8 286 5 506 5 Charge Using Approach Method System Outdoor 21229 Temperatures 65 F or Above 519 3 525 8 The following procedure is intended as a general guide and 532 4 is for use on expansion valve systems only For best results 539 0 indoor temperature should be 70 F to 80 F Monitor system 5325 pressures while charging a 147 4 290 3 w o 150 1 295 1 a A A A A A W a wl N oj o 2 of oj aj 5 o 152 8 299 4 a 155 5 303 8 a o 158 2 308 2 a be 161 0 312 7 a 163 9 317 2 552 3 1 Record outdoor ambient temperature usig a digital thermometer a 166 7 321 8 559 1 169 6 326 4 565 9 o 172 6 331 0 572 8 2 Attach high pressure gauge set and operate unit for 379 8 several minutes to allow system pressures to stabilize 586 8 593 8 3 Compare stabilized pressures with those provided in Table 601 0 8 Minor variations in these pressures may be expected 608 1 due to differences in installations Significant differences CIE could mean that the system is not properly charged or that a problem exists with some component in the System Pressures higher than those listed indicate that the system is overcharged Pressures lower than those listed indicate that the system is undercharged Verify adjusted charge using the approach method 175
4. 24 must be maintained between units 48 clearance required on top of unit Maximum soffit overhang is 36 Figure 1 Place a sound absorbing material such as Isomode under the unit if it will be installed in a location or position that will transmit sound or vibration to the living area or adjacent buildings Page 2 e Install the unit high enough above the ground or roof to allow adequate drainage of defrost water and prevent ice buildup In heavy snow areas do not locate the unit where drifting snow will occur The unit base should be elevated above the depth of average snows NOTE Elevation of the unit may be accomplished by construction a frame using suitable materials If a support frame is constructed it must not block drain holes in unit base When installed in areas where low ambient temperatures exist locate unit so winter prevailing winds do not blow directly into outdoor coil Locate unit away from overhanging roof lines which would allow water or ice to drop on or in front of coil or into unit Slab Mounting When installing a unit at grade level install on slab high enough above grade so that water from higher ground will not collect around the unit See Figure 2 Slab should have a slope tolerance away from the building of 2 or 2 per 5 This will prevent ice from building up under the unit during a defrost cycle Refer to following roof mounting section for barrier construction
5. 5 335 7 o 178 5 340 5 181 6 345 3 o a 184 3 350 1 187 7 355 0 190 9 360 0 w 194 1 365 0 622 7 197 3 370 0 630 1 o 200 6 375 1 637 5 E 203 9 380 2 645 0 207 2 385 4 w 210 6 390 7 4 Use the same digital thermometer to check liquid line 385 4 temperature E N 207 2 w N o o N N N 210 6 390 7 A 5 Subtract the outdoor ambient temperature from the liquid line temperture to determine the approach temperature Table 5 506470 01 Issue 1007 Page 15 Liquid Line Temperature F Outdoor Ambient Temperature F o Approach Temperature F 6 Compare the approach value with those shown in Table 9 If the values do not agree with those provided in Table 8 add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature Check Charge Using Normal Operating Pressures Use Table 7 to perform maintenance checks Table 7 is not a procedure for charging the system Minor variations in these pressures may be due to differences in installations Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system Approach Values for TXV Systems Approach value is the liquid line temperature minus the outdoor ambient temperature 1 F Note For best results use the same digital thermometer to check bo
6. A WARNING Turn all electric power to unit OFF at disconnect switch es before performing any maintenance operations on system Unit may have multiple power supplies Electrical shock could cause personal injury or death Ask your dealer to show you where the indoor unit s filter is located It will be either at the indoor unit installed internal or external to the cabinet or behind a return air grille in the wall or ceiling in your home Check the filter monthly and clean or replace it as needed Disposable filters should be replaced with a filter of the same type and size If you are unsure of the filter you need for your system contact your dealer Many indoor units are equipped with reusable foam filters These filters can be cleaned with a mild soap and water solution Rinse the filter thoroughly and let dry completely before returning to unit or grille The filter and all access panels must be in place any time the unit is in operation Some systems are equipped with an electronic air cleaner designed to remove the majority of airborne particles from the air passing through the cleaner If your system includes an electronic air cleaner ask your dealer for maintenance instructions Inspect and clean indoor coil The indoor evaporator coil is equipped with a drain pan to collect condensate formed as the system removes humidity from the inside air Have your dealer show you the location of the drain line and how to
7. FOR USE WITH COPPER CONDUCTORS ONLY REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT 587 AMPACITY AND MAXIMUM LOW PRESSURE OVERCURRENT PROTECTION SWITCH SIZE WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES Sjo Ov DENOTES OPTIONAL COMPONENTS LINE VOLTAGE FIELD INSTALLED HIGH PRESSURE CLASS VOLTAGE FIELD INSTALLED SWITCH 24 VOLT FACTORY INSTALLED 48630 001 506470 01 Issue 1007 Page 27 NOTES 506470 01 Issue 1007 Page 28
8. circuit is interrupted by an pressure switch wired to the control board In addition the diagnostic LEDs will indicate a locked out pressure switch after the fifth occurrence of an open pressure switch See Table 9 The unit will remain 506470 01 Issue 1007 locked out until power to the board is interrupted then re established or until the jumper is applied to the TEST pins for 0 5 seconds NOTE The defrost control board ignores input from the low pressure switch terminals as follows During the TEST mode During the defrost cycle During the 90 seconds start up period For the first 90 seconds each time the reversing valve switches heat cool modes If the TEST pins are jumpered and the 5 minute delay is being bypassed the LO PS terminal signal is not ignored during the 90 second start up period Diagnostic LEDs The defrost board uses two LEDs for diagnostics The LEDs flash a specific sequence according to the condition as shown in Table 9 Defrost Control Board Diagnostic LEDs Green LED Red LED DS2 DS1 Simultaneous Slow Flash No Power to Board Normal Operation Power to Board Anti Short Cycle Lockout Alternating Slow Flash Slow Flash Low Pressure Switch Fault Low Pressure Switch Lockout Slow Flash Table 9 High Pressure Switch Fault High Pressure Switch Lockout Page 19 System Diagnostic Module 4HP18LT units contain a diagnostic module for troubleshouting heat pum
9. in lineset will reduce lineset vibration Figure 5 Issue 1007 Page 5 6 Braze the line set to the service valve Quench the joints with water or a wet cloth to prevent heat damage to the valve core and opening port The tube end must stay bottomed in the fitting during final assembly to ensure proper seating sealing and rigidity 7 Install the thermal expansion valve which is sold separately and which is approved for use with R410A refrigerant in the liquid line at the indoor coil see Refrigerant Metering Device on page 9 A CAUTION When flushing existing line set and or indoor coil be sure to empty all existing traps Residual mineral oil can act as an insulator preventing proper heat transfer It can also clog the thermal expansion valve reducing system performance and capacity Failure to properly flush system as explained in these instructions will void warranty Refrigerant Line Sets Installing Horizontal Runs To hang line set from joist or rafter use either metal strapping material or anchored heavy nylon wire ties Strapping Material around vapor line only Floor Joist or Roof Rafter N N Ze Metal Sleeve ae Floor Joist or Roof Rafter 2 MA ee Wire Tie around vapor line only Tape or Wire Tie Strap the vapor line to the joist or rafter at 8 intervals then strap the liquid line to the vapor line i Tape or Wire Tie Fig
10. seconds the control will enter the defrost mode If the jumper is removed before an additional 5 second period has elapsed 7 seconds total the unit will remain in defrost mode until the defrost thermostat opens or 14 minutes have passed If the jumper is not removed until after the additional 5 second period has elapsed the defrost will terminate and the test option will not function again until the jumper is removed and reapplied Compressor Delay The defrost board has a field selectable function to reduce occasional sounds that may occur while the unit is cycling in and out of the defrost mode The compressor will be cycled off for 30 seconds going in and out of the defrost mode when the compressor delay jumper is removed NOTE The 30 second off cycle is not functional when jumpering the TEST pins Time Delay The timed off delay is 5 minutes long The delay helps to protect the compressor from short cycling in case the power to the unit is interrupted or a pressure switch opens The delay is bypassed by placing the timer select jumper across the TEST pins for 0 5 seconds Pressure Switch Circuit The defrost control includes two pressure switch circuits A high pressure switch is connected to the board s HI PS terminals See Figure 14 The low pressure or loss of charge pressure switch is connected to the LPS terminals During a single demand cycle the defrost control will lock out the unit after the fifth time that the
11. the manifold gauge valve at least once to determine if there is a rapid rise in pressure A rapid rise in pressure indicates a relatively large leak If this occurs the leak testing procedure must be repeated 6 When 500 microns or lower is maintained close the manifold gauge valves turn off the vacuum pump and disconnect the manifold gauge center port hose from the vacuum pump Attach the manifold gauge center port hose to a nitrogen cylinder with pressure regulator set to 150 psig and purge the hose Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves 7 Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the nitrogen from the line set and indoor unit 8 Reconnect the manifold gauge to the vacuum pump turn the pump on and continue to evacuate the line set and indoor unit until 500 microns is maintained within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves 9 When the requirements above have been met disconnect the manifold hose from the vacuum pump Open the service valves to break the vacuum in the line set and indoor unit 506470 01 Issue 1007 Page 12 START UP CAUTION If unit is equipped with a crankcase heater it should be energized 24 hours before unit start up to prevent compressor damage as a result of slugging
12. valve before continuing with flushing procedures R 22 flow control devices are not approved for use with R410A refrigerant and may prevent proper flushing Use a field provided fitting to reconnect the lines 5 Remove the pressure tap valve cores from the 4HP18LT units service valves Connect an R 22 cylinder with clean refrigerant to the suction service valve Connect the R 22 gauge set to the liquid line valve and connect a recovery maching with an empty recovery tank to the gauge set 6 Set the recovery machine for liquid recovery and start the recovery machine Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor coil 7 Invert the cylinder of clean R 22 and open its valve to allow liquid refrigerant to flow in to the system through the suction line valve Allow the refrigerant to pass from the cylinder and through the line set and the indoor coil before it enters the recovery machine 8 After all of the liquid refrigerant has been recovered switch the recovery machine to vapor recovery so that all of the R 22 vapor is recovered Allow the recovery machine to pull a vacuum on the sytem NOTE Asingle system flush should remove all of the mineral oil from the existing refrigerant lines and indoor coil A second flushing may be done using clean refrigerant if insufficient amounts of mineral oil were removed during the first flush After each system flush allow the r
13. G Line voltage is present at all components when unit is not in operation on units with single pole contactors Disconnect all remote electric power supplies before opening access panel Unit may have multiple power supplies Failure to disconnect all power supplies could result in personal injury or death Issue 1007 Page 3 Defrost Control Thermostat 8250 Compressor m Line Vollaga am uu CABS l Voltage instalisd Fiald Installed NOTE For use with copper conductors oniy Refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size A WARNING ELECTRIC SHOCK HAZARD Can cause INJURY or DEATH Unit must be grounded accordance with national and local codes Figure 4 1 Install line voltage power supply to unit from a properly sized disconnect switch Any excess high voltage field wiring should be trimmed or secured away from the low voltage field wiring 2 Ground unit at unit disconnect switch or to an earth ground To facilitate conduit a hole is in the bottom of the control box Connect conduit to the control box using a proper conduit fitting Units are approved for use only with copper conductors 24V Class II circuit connections are made in the low voltage junction box Refer to Figure 4 for high voltage field wiring diagram Acomplete unit wiring diagram is located inside the unit control box cover 3 Install room thermostat on an ins
14. INSTALLATION AND MAINTENANCE INSTRUCTIONS 4HP18LT Series Split System Heat Pump Save these instructions for future reference A WARNING The equipment covered in this manual is to be installed by trained and experienced service and installation technicians Improper installation modification service or use can cause electrical shock fire explosion or other conditions which may cause personal injury death or property damage Use appropriate safety gear including safety glasses and gloves when installing this equipment A WARNING Risk of electrical shock Disconnect all remote power supplies before installing or servicing any portion of the INSTALLATION system Failure to disconnect power supplies can result in property damage personal injury or death CONNECTION DIAGRAM TABLE OF CONTENTS START UP OPERATION A WARNING Installation and servicing of air conditioning equipment MAIN TENANE can be hazardous due to internal refrigerant pressure and live electrical components Only trained and qualified service personnel should install or service this equipment Installation and service performed by unqualified persons can result in property damage personal injury or death Manufactured By Allied Air Enterprises Inc A Lennox International Inc Company 215 Metropolitan Drive West Columbia SC 29170 A WARNING 506470 01 Issue 1007 Page 1 INSTALLATION Ge
15. begins Defrost Control Board Defrost Interval Timing Pins o 4 Test Pins 5 Compressor Delay Pins gt E Reversing Valve 0 OUT Low Pressure Switch LOPS optional Defrost Thermostat ELM o K1 Relay Q bps1 ae Diagnostic LEDs K2 Relay p20 w1 4 24V TerminalStrip Connections K3 Relay e IeIeIeIeIeIe TSTPS DF C R O Yi High Pressure Switch optional Figure 14 506470 01 Issue 1007 Page 18 Defrost Control Timing Pins Each timing pin selection provides a different accumulated compressor run time period during one thermostat run cycle This time period must occur before a defrost cycle is initiated The defrost interval can be adjusted to 30 T1 60 T2 or 90 T3 minutes The defrost timing jumper is factory installed to provide a 60 minute defrost interval If the timing selector jumper is not in place the control defaults to a 90 minute defrost interval The maximum defrost period is 14 minutes and cannot be adjusted Atest option is provided for troubleshooting The test mode may be started any time the unit is in the heating mode and the defrost thermostat is closed or jumpered If the jumper is in the TEST position at power up the control will ignore the test pins When the jumper is placed across the TEST pins for 2
16. cedure should not be performed on systems which contain contaminants such as compressor burn out Required Euipment The following equipment is needed to flush the existing line set and indoor coil See Figure 9 Two clean R 22 recovery bottles an oil less recovery machine with a pump down feature and two sets of gauges one for use with R 22 and one for use with R410A Flushing Procedure IMPORTANT The line set and or indoor coil must be flushed with at least the same amount of refrigerant that previously charged the system Check the charge in the flushing cylinder before flushing the unit 1 Remove existing R 22 refrigerant using the appropriate procedure If the existing outdoor unit is not equipped with shutoff valves or if the unit is not operational AND the existing R 22 refrigerant will be used to flush the system Disconnect all power to the existing outdoor unit Connect the existing unit a clean recovery cylinder and the recovery machine according to the instructions provided with the recovery machine Remove all R 22 refrigerant from the existing system Refer to the gauges after shutdown to confirm that the entire system is completely void of refrigerant Disconnect the liquid and suction lines from the existing outdoor unit If the existing outdoor unit is equipped with manual shutoff valves AND new R 22 refrigerant will be used to flush the system Start the existing R 22 refrigerant system in cooli
17. check for obstructions This also applies to an auxiliary drain if one is installed Inspect and clean outdoor coil Make sure no obstructions restrict airflow to the outdoor unit Leaves trash or shrubs crowding the unit can cause it to work harder and use more energy Keep shrubbery trimmed away from the unit and periodically check for debris which collects around the unit The outdoor coil may require frequent cleaning depending on environmental conditions Clean the outdoor coil with an unpressurized water hose to remove surface contaminants and debris It may be necessary to flush the outdoor coil 506470 01 Issue 1007 more frequently if it is exposed to substances which are corrosive or which block airflow across the coil such as pet urine cottonwood seeds etc Heat Pump Operation Heat pump units have several characteristics you should be aware of Heat pumps satisfy heating demand by delivering large amounts of warm air into the living space This is quite different from gas fired oil fired or electric furnaces which deliver lower volumes of considerably hotter air to heat the space Do not be alarmed if you notice frost on the outdoor coil in the winter months Frost develops on the outdoor coil during the heating cycle when temperatures are below 45 F An electronic control activates a defrost cycle lasting 5 to 15 minutes at preset intervals to clear the outdoor coil of the frost A shift in sound type d
18. d for use with pressures 1 800 onthe high side and a low side of 30 vacuum to 250 psi with dampened speed to 500 psi Gauge hoses must be rated for use at up to 800 psi of pressure with a 4000 psi burst rating Liquid and Suction Line Service Valves The liquid line and suction line service valves See Figure 11 and service ports are used for leak teating evacuation charging and checking charge Each valve is equipped with a service port which has a factory installed Schrader valve Aservice port cap protects the Schrader valve from contamination and serves as the primary leak seal To Access the Schrader Port 1 Remove the service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6 turn To Open Liquid or Suction Line Service Valve Remove stem cap with an adjustable wrench Use service wrench with a hex head extension to back the stem out counterclockwise as far as it will go Use a 3 16 hex head extension for liquid line service valves anda 5 16 extension for suction line service valves Replace the stem cap Tighten finger tight then tighten an additional 1 6 turn To Close Liquid or Suction Line Service Valve 1 Remove the stem cap with an adjustable wrench 2 Use a service wrench with hex head extension to turn the stem clockwise to seat the valve Tighten firmly 3 Replace t
19. ecessary to replace the filter drier several times to achieve the required dryness level If system dryness is not verified the compressor will fail in the future The outdoor unit should be charged during warm weather However applications arise in which charging must occur in the colder months The method of charging is determined by the unit s refrigerant metering device and the outdoor ambient temperature Measure the liquid line temperature and the outdoor ambient temperature as outlined below Page 13 Cooling Cycle OUTDOOR UNIT EXPANSION CHECK VALVE LOW H PRESSURE PRESSURE 1 NOTE ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW INDOOR UNIT EXPANSION CHECK VALVE Use gauge ports on suction line valve and liquid line valve for evacuating refrigerant lines and indoor coil Use suction gauge port to measure suction pressure during charging Figure 13 1 Connect the manifold gauge set to the service valve ports as follows See Figure 13 above Low pressure gauge to suction line service valve e High pressure gauge to liquid line service valve 2 Close manifold gauge set valves Connect the center manifold hose to an upright cylinder of R410A 3 If room temperature is below 70 F set the room thermostat to call for heat This will create the necessary load for properly charging the system in the cooling cycle 4 Use a digital thermometer to record the outdoor ambient temperature 5 When the heati
20. ecovery machine to pull a vacuum on the system at the end of the procedure 9 Close the valve on the inverted R 22 cylinder and the gauge set valves Pump the remaining refrigerant out of the recovery machine and turn the machine off 10 Use nitrogen to break the vacuum on the refrigerant lines and indoor coil before removing the recovery machine gauges and R 22 refrigerant drum Re install pressure tap valve cores into the 4SHP18LT unit s service valves 11 Install the fixed orifice or thermal expansion valve approved for use with R410A refrigerant in the liquid line at the indoor coil Refrigerant Metering Device 4HP18LT units are designed for use with TXV systems Refer to the appropriate following section for information on installing the chosen refrigerant metering device 506470 01 Issue 1007 An R410A system will not operate properly with an R 22 metering device Install the refrigerant metering device as shown in Figure 11 Do not twist cap tubes when loosening the seal nut from the orifice housing Use wrench to back up the distributor Metering Device Installation Distributor Expansion Valve opt Sait fm Strainer 1 Liquid Line Stub If necessary remove R22 flow control device fixed orifice thermal expansion valve from existing line set before installing R410A approved orifice or expansion valve Figure 10 Expansion Valve Systems Expansion valves equipped with Chatleff type fit
21. he compressor Size vertical suction riser to maintain minimum velocity at minimum capacity Recommended line length is 50 or less If more than 50 line set is required contact Technical Services Table 2 shows the diameters for line sets up to 100 although vertical lift applications and trapping requirements need to be reviewed with Technical Services for line sets over 50 Installing Refrigerant Line During the installation of an air conditioning system it is important to properly isolate the refrigerant line to prevent unnecessary vibration Line set contact with the structure wall ceiling or floor may cause objectionable noise when vibration is translated into sound As a result more energy or vibration can be expected Close attention to line set isolation must be observed Following are some points to consider when placing and installing a high efficiency outdoor unit Page 4 Placement Be aware that some localities are adopting sound ordinances based on how noisy the unit is at the neighbor s home not at the original installation Install the unit as far as possible from the property line When possible do not install the unit directly outside a bedroom window Glass has a verry high level of sound transmission Figure 5 shows how to place the outdoor unit and line set to reduce line set vibration Line Set Isolation Illustrations on pages 6 and 7 demonstrate procedures which ensure proper refrigerant line
22. he cylinder without inverting the cylinder Do not turn this type of cylinder upside down to draw refrigerant 506470 01 Issue 1007 Units are factory charged with the amount of R410A refrigerant indicated on the unit rating plate This charge is based on a matching indoor coil and outdoor coil with 15 line set For varying lengths of line set refer to Table 4 for refrigerant charge adjustment A blank space is provided on the unit rating plate to list the actual field charge Refrigerant Charge Adjustment Liquid Line Set Oz per 5 ft adjust Diameter from 15 ft line set If line length is greater than 15 ft add this amount If line length is less than 15 ft remove this amount Table 4 A IMPORTANT Mineral oils are not compatible with R410A If oil must be added it must be a polyolester oil If the system is void of refrigerant clean the system using the procedure described below 1 Use dry nitrogen to pressurized the system and check for leaks Repair leaks if possible 2 Evacuate the system to remove as much of the moisture as possible 3 Use dry nitrogen to break the vacuum 4 Evacuate the system again 5 Weigh the appropriate amount of R410A refrigerant listed on unit nameplate into the system 6 Monitor the system to determine the amount of moisture remaining in the oil Use a test kit to verify that the moisture content is withing the kit s dry color range It may be n
23. he stem cap Tighten finger tight then tighten an additional 1 6 turn 506470 01 Issue 1007 Suction Line Ball Type Service Valve Suction line ball type service valves function the same way as the other valves the difference is in the construction See Figure 12 The ball valve is equipped with a service port with a factory installed Schrader valve A service port cap protects the Schrader valve from contamination and serves as the primary seal Leak Testing After the line set has been connected to the indoor and outdoor units the line set connections and indoor unit must be checked for leaks Service Valve Valve Closed Stem Cap Service Port E X Insert hex wrench here To indoor Schrader valve open to line set when valve is closed front seated valve front seated Insert hex Stem Cap Service Port Cap To indoor coil Schrader Valve Valve Open Figure 11 Page 10 Ball Type Service Valve Valve Open 4 Stem Cap outdoor coil Service Port Schrader Valve Ise adjustable wrench To open rotate stem ounterclockwise 1 4 turn 90 To close rotate tem clockwise 1 4 turn 90 Figure 12 A WARNING Refrigerant can be harmful if inhaled Refrigerant must always be used and recovered responsibly Incorrect or irresponsible use of refrigerant can result in personal injury or death A WARNING Never use oxygen to pressurize
24. ide wall that is not subject to drafts direct sunshine or other heat sources 4 Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit See Wire Diagram on page 27 5 Do not bundle any excess 24V control wire inside control box Run control wire through installed wire tie and tighten wire tie to provide low voltage strain relief and to maintain seperation of field installed low and high voltage circuits 506470 01 Issue 1007 Refrigerant Piping If the 4HP18LT unit is being installed with a new indoor coil and line set the refrigerant connections should be made as outlined in this section If an existing line set and or indoor coil will be used to complete the system refer to this section as well as the section that follows entitled Flushing Existing Line Set and Indoor Coil If this unit is being matched with an approved line set or indoor coil which was previously charged with R 22 refrigerant the line set and coil must be flushed prior to installation If the unit is being used with and existing indoor coil which was equipped with a liquid line which served as a metering device RFCI the liquid line must be replaced prior to the installation of the 4HP18LT unit Field refrigerant piping consists of liquid and suction lines from the outdoor unit sweat connections to the indoor coil flare or sweat connections Select line set diameters from Table 2 to ensure that oil returns to t
25. if unit must face prevailing winter winds Slab Mounting Discharge Air Building Structure Mounting Slab Ground Level ENT Figure 2 Roof Mounting Install unit at a minimum of 6 above surface of the roof to avoid ice buildup around the unit Locate the unit above a load bearing wall or area of the roof that can adequately support the unit Consult local codes for rooftop applications 506470 01 If unit coil cannot be mounted away from prevailing winter winds a wind barrier should be constructed See Figure 3 Size the barrier at least the same height and width as the outdoor unit Mount barrier 24 from the sides of the unit in the direction of the prevailing winds Wind Barrier Construct Prevailing Winter Winds 2 ae Inlet Air Inlet Air Figure 3 Electrical Wiring All field wiring must be done in accordance with the National Electrical Code NEC recommendations Canadian Electrical Code CEC and CSA Standards or local codes where applicable Refer to the furnace or blower coil installation instructions for additional wiring application diagrams and refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size A WARNING Unit must be grounded in accordance with national and local codes Failure to ground unit properly can result in personal injury or death A WARNIN
26. inals are wired in reverse Verify module s and terminals have a constant source Review 24VAC Power Wiring section on page 20 for R and C wiring Verify Y terminal is connected to 24VAC at contactor coil Verify voltage at contactor coils falls below 0 5VAC when off Verify R and C terminals are supplied with 19 28VAC Verify Y terminal is connected to 24VAC at contactor coil Verify voltage at contactor coil falls below 0 5VAC when off Check that compressor run and start wires are through module s current sensing holes Verify Y terminal is connected to 24VAC at contactor coil Verify voltage at contactor coil falis below 0 5VAC when off Check that compressor run and start wires are routed through the correct module sensing holes Determine if module s Y terminal is connected Verify Y terminal is connected to 24VAC al contactor coil Verily 24 is present across Y and C when thermostat demand signal is present If not R and C are reverse wired Verify voltage at contactor coil falls below 0 5 when off Review Thermostat Demand Wiring on this page for Y and C wiring Table 12 Issue 1007 Page 22 MAINTENANCE A WARNING Before performing maintenance operations on system turn the electric power to unit OFF at disconnect switch es Unit may have multiple power supplies Electrical shock could cause personal injury or death Before the start of each heating and cooling season the foll
27. iring or connections 6 Unusually long compressor protector reset time due to extreme ambient temperature 7 Compressor windings are damaged Check compressor motor winding resistance Open Circuit 1 Run capacitor has failed Open Start Circuit 2 Open circuit in compressor start wiring or connections Current only in run Check wiring and connectors between supply and the compressor S terminal circuit 3 Compressor start winding is damaged Check compressor motor winding resistance ALERT Yellow Flash Code 6 ALERT OM 1 Open circuit in compressor run wiring or connections Open Run Circuit pi Yellow Check wiring and connectors between supply and the compressor R terminal Current only in start iic 2 Flash circuit 2 Compressor run winding is damaged Code 7 Check compressor motor winding resistance ALERT Yellow Flash Code 8 Welded Contactor Compressor always runs 1 Compressor contactor has failed closed 2 Thermostat demand signal not connected to module ALERT Yellow Flash Code 9 Low Voltage 1 Control circuit transformer is overloaded Control circuit less 2 Low line voltage contact utility if voltage at disconnect is low than 17VAC Check wiring conditions Table 11 506470 01 Issue 1007 Page 21 Thermostat Demand Wiring The diagnostic module requires a thermostat demand signal to operate properly The thermostat demand signal input labeled Y on the module should always be connected t
28. minals flash code until the condition returns to normal or 21VAC is must be directly from the indoor unit or thermostat The removed from the module TRIP and ALERT LEDs flashing module cannot be powered by R and C terminals on the at the same time means control circuit voltage is too low for defrost board without experiencing nuisance alerts operation Flash Codes cont LED en Fault Description Troubleshooting Information Short Cycling 1 Thermostat demand signal is intermittent Compressor is 2 Time delay relay or control board defective running 3 If high pressure switch present go to Flash Code 2 info only briefly 4 If low pressure switch present go to Flash Code 1 info 1 Run capacitor has failed ALERT 2 Low line voltage contact utility if voltage at disconnect is low Yellow Locked Rotor Check wiring connections Flash 3 Excessive liquid refrigerant in compressor Code 4 4 Compressor bearings are seized Measure compressor oil level 1 Outdoor unit power disconnect is open 2 Compressor circuit breaker or fuse s is open 3 Compressor contactor has failed open Check compressor contactor wiring and connectors ALERT Check for compressor contactor failure burned pitted or open Yellow Check wiring and connectors between supply and compressor Flash Check for low pilot voltage at compressor contactor coil Code 5 4 High pressure switch is open and requires manual reset 5 Open circuit in compressor supply w
29. n to remind the homeowner that the unit is operating in the emergency heat mode Emergency heat is usually used during an outdoor shutdown but it should also be used following a power outage if power has been off for over an hour and the outdoor temperature is below 50 F System should be left in the emergency heat mode at least 6 hours to allow the crankcase heater sufficient time to prevent compressor slugging Defrost System The defrost system includes two components the defrost thermostat and the defrost control Defrost Thermostat The defrost thermostat is located on the liquid line between the check expansion valve and the distributor When the defrost thermostat senses 42 F or cooler the thermostat contacts close and send a signal to the defrost control board to start the defrost timing It also terminates defrost when the liquid line warms up to 70 F Defrost Control The defrost control board includes the combined functions of time temperature defrost control defrost relay diagnostic LEDS and terminal strip for field wiring connections See Figure 14 The control provides automatic switching from normal heating operation to defrost mode and back During the compressor cycle call for defrost the control accumulates compressor run time at 30 60 90 minute field adjustable intervals If the defrost thermostat is closed when the selected compressor run time interval ends the defrost relay is energized and the defrost
30. neral Read this entire instruction manual as well as the instructions supplied in separate equipment before starting the installation Observe and follow all warnings cautions instructional labels and tags Failure to comply with these instructions could result in an unsafe condition and or premature component failure These instructions are intended as a general guide only for use by qualified personnel and do not supersede any national or local codes in any way The installation must comply with all provincial state and local codes as well as the National Electrical Code U S or Canadian Electrical Code Canada Compliance should be determined prior to installation 4HP18LT condensing units use R410A which is an ozone friendly HFC refrigerant The unit must be installed with a matching indoor coil and line set A filter drier approved for use with R410A is installed in the unit IMPORTANT This product has been designed and manufactured to meet ENERGY STAR criteria for energy efficiency when matched with appropriate coil components However proper refrigerant charge and proper air flow are critical to achieve rated capacity and efficiency Installation of this product should follow the manufacturer s refrigerant charging and air flow instructions Failure to confirm proper charge and airflow may reduce energy efficiency and shorten equipment life When servicing or repairing HVAC components ensure the fasteners are appro
31. ng demand has been satisfied switch the thermostat to cooling mode with a set point of 68 F When pressures have stabilized use a digital thermometer to record the liquid and suction line temperatures 6 The outdoor temperature will determine which charging method to use Proceed with the appropriate charging method Charge Using Weigh In Method Fixed Orifice TXV Systems Outdoor Temperatures Below 65 F If the system is void of refrigerant or if the outdoor ambient temperature is cool use the weigh in method to charge the unit Do this after any leaks have been repaired 1 Recover the refrigerant from the unit 506470 01 Issue 1007 2 Conduct a leak check then evacuate as previously outlined 3 Weigh in the charge according to the total amount shown on the unit nameplate If weighing facilities are not available or if unit is being charged during warm weather use one of the following procedures Charge Using Subcooling Method Fixed Orifice TXV Systems Outdoor Temperatures 65 F or Above If charging a fixed orifice or TXV system when the outdoor ambient temperature is 65 F or above the subcooling method can be used to charge the unit 1 With the manifold gauge hose still on the liquid service port and the unit operating stably use a digital thermometer to check the liquid line temperature For best results use the same digital thermometer to check both the outdoor ambient and the liquid line temperatures
32. ng mode and close the liquid line valve Pump all the existing R 22 refrigerant back into the outdoor unit It may be necessary to bypass the low pressure switches to ensure complete refrigerant evacuation When the low side system pressures reach 0 psig close the suction line valve Disconnect all power to the existing outdoor unit Refer to the gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system Disconnect the liquid and suction lines from the existing outdoor unit 2 Remove the existing outdoor unit Set the new R410A unit and follow the brazing connection procedure outlined previously on this page to make line set connections Do not install the R410A thermal expansion valve at this time 3 Make low voltage and line voltage connections to the new outdoor unit Do not turn on power to the unit or open the outdoor unit service valves at this time Flushing Connections INVERTED R22 CYLINDER Contains clean R22 to be used for flushing SUCTION LINE SERVICE VALVE EXISTING SUCTION LINE LOW HIGH PRESSURE PRESSURE OUTDOOR UNIT EXISTING 8 2 21556280 EXISTING LIQUID LINE LIQUID LINE OPENED CLOSED SERVICE VALVE IO DISCHARGE RECOVERY CYLINDER RECOVERY MACHINE Figure 9 506470 01 Issue 1007 Page 8 4 Remover the existing R 22 refrigerant flow control orifice or thermal expansion
33. o the compressor contactor coil so that when the coil is energized the demand signal input is 24VAC When the coil is not energized the demand signal input should be less than 0 5VAC Miswired Module Codes Depending on the system configuration some ALERT flash codes may not be active The presence of safety switches affects how the system alerts are displayed by the module Miswiring the diagnostic nodule will cause false LED codes Table 12 Describes LED operation when the module is miswired and what troubleshooting action is required to Miswired Module Indication Green LED is not on module does not power up Green LED intermittent module powers up only when compressor runs TRIP LED is on but system and compressor chack OK TRIP LED and ALERT LED flashing together ALERT Flash Code 3 Compressor Short Cycling displayed incorrectly ALERT Flash Code 5 6 or 7 Open Circuit Open Start Circuit or Open Run Circuit displayed incorrectly ALERT Flash Code 6 Open Start Circuit displayed for Code 7 Open Run Circuit or vice versa ALERT Flash Code 8 Welded Contactor displayed incorrectly 506470 01 correct the problem Miswired Module Troubleshooting Recommended Troubleshooting Action Determine if both R and C module terminals are connected Verify voltage is present at module s R and C terminals Review 24VAC Power Wiring section on page 20 for R and C wiring Determine if R and Y term
34. oes occur during the defrost mode During the defrost cycle you may notice steam rising from the unit This is a normal occurrence The thermostat may engage auxiliary heat during the defrost cycle to satisfy a heating demand The unit will return to normal operation at the conclusion of the defrost cycle In case of extended power outage If the outdoor temperature is below 50 F and power to the outdoor unit has been interrupted for 6 hours or longer observe the following when restoring power to the heat pump system Set the room thermostat selctor to the Emergency Heat setting to obtain temporary heat for a minimum of 6 hours This will allow system refrigerant pressures and temperatures enough time to return to a stabilized condition In the Emergency Heat mode all heating demand is satisfied by auxiliary heat heat pump operation is locked out After a 6 hour warmup period the thermostat can then be switched to the Heat setting and normal heat operation may resume Thermostat Operation Though your thermostat may vary somewhat from the description below its operation will be similar Temperature Setting Levers Most heat pump thermostats have two temperature selector levers one for heating and one for cooling Set the levers or dials to the desired temperature setpoints for both heating and cooling Avoid frequent temperature adjustment turning the unit off and back on before presssures equalize
35. ollowing before calling for service Check to see that all electrical disconnect switches ar ON Make sure the thermostat temperature selector is properly set Make sure the thermostat system switch is properly set Replace any blown fuses or reset circuit breakers Make sure unit access panels are in place Make sure air filter is clean Locate unit model number and have it handy before calling Page 25 Start Up and Performance Checklist Job No City City Serial No o Service Technician Nameplate Voltage ated Load Ampacity Compressor Amperage Outdoor Fan aximum Fuse or Circuit Breaker lectical Connections Tight 22 Indoor Filter Clean Supply Voltage Unit Off ndoor Blower RPM S P Drop Over Indoor Dry Dutdoor Coil Entering Air Temperature Voltage with Compressor Operating Dutdoor Fan Checked Suction Line Pressure Refrigerant Charge Checked iquid Line Pressure Suction Line Pressure Refrigerant Charge Checked LI efrigerant Lines Leak Checked Properly Insulated eating Correct Cooling Correct 506470 01 Issue 1007 Page 26 Wire Diagram LT BLUE OUTDOOR a ae ge YELLOW COMPRESSOR COMPRESSOR CONTACTOR CRANKCASE HEATER 208 230 60 1 GROUND e LUG ie lli GROUND THERMOSTAT REVERSING VALVE DEFROST THERMOSTAT BLACK 208 230 60 1 EQUIPMENT GROUND PURPLE DESCRIPTION COMPONENT MODULE N
36. owing service checks should be performed by a qualified service technician Inspect and clean outdoor and indoor coils The outdoor coil may be flushed with a water hose NOTE It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block air flow across the coil such as pet urine cottonwood seeds etc Visually inspect the refrigerant lines and coils for leakes Check wiring for loose connections Check voltage at the indoor and outdoor units with units operating Check amperage draw at the outdoor fan motor compressor and indoor blower motor Values should be compared with those given on unit nameplate Check clean or replace indoor unit filters Check the refrigerant charge and gauge the system pressures Check the condensate drain line for free and unobstructed flow Clean drain line if necessary Adjust blower speed for cooling Measure the pressure drop over the coil to determine the correct blower CFM Belt drive blowers Check drive belt for wear and proper tensions If insufficient cooling is reported the unit should be gauged and refrigerant charge checked see Refrigerant Charging on page 13 506470 01 Issue 1007 Page 23 HOMEOWNER INFORMATION In order to ensure peak performance your system must be properly maintained Clogged filters and blocked airflow prevent your unit from operating at its most efficient level
37. p system failures By monitoring and analyzing data from the compressor and thermostat demand the module can accurately detect the cause of electrical and system related failure without any sensors If a system problem occurs a flashing LED indicator communicates the failure code LED Description POWER LED Green indicates voltage is present at the power connection of the module ALERT LED Yellow communicates an abnormal system condition through a unique flash code The ALERT LED will flash a number of times consecutively pause and then repeat the process The number of consecutive flashes TRIP LED Red indicates there is a demand signal from the thermostat but no current to the compressor is detected by the module The TRIP LED typically indicates the compressor protector is open or may indicate missing supply power to the compressor Interpreting the Diagnostic LEDs When an abnormal system condition occurs the diagnostic nodule displays the appropriate ALERT and or TRIP LED The yellow ALERT LED will flash a number of times consecutively pause and then repeat the process To identify a slash code number count the number of consecutive flashes Refer to Table 10 below and Table 11 on page 20 for information on the flash codes correlates to a paticular abnormal condition LED AN Fault Description Flash Codes Troubleshooting Information es eh Module has power Supply voltage is present at module terminals Thermos
38. priately tightened Table 1 shows torque values for fasteners Torque Table Service Port Caps 8 ft Ibs Sheet Metal Screws 16 in Ibs 8 Machine Screws 16 in Ibs 10 Machine Screws 28 in Ibs Compressor Bolts 90 in Ibs Table 1 506470 01 Issue 1007 Inspection of Shipment Upon receipt of equipment carefully inspect it for possible shipping damage If damage is found it should be noted on the carrier s freight bill Take special care to examine the unit inside the carton if the carton is damaged Any concealed damage discovered should be reported to the last carrier immediately preferably in writing and should include a request for inspection by the carrier s agent If any damages are discovered and reported to the carrier DO NOT INSTALL THE UNIT as claim may be denied Check the unit rating plate to confirm specifications are as ordered Location of Unit Outdoor units operate under a wide range of weather conditions therefore multiple factors must be considered when positioning the unit The unit must be positioned to give adequate clearances for sufficient airflow and servicing Refer to Figure 1 for installation clearances Installation Clearances A service clearance of 30 must be maintained on one of the sides adjacent to the control box Clearance to one of the other three sides must be 36 Clearance to one of the remaining two sides may be 12 and the final side may be 6 Aclearance of
39. puts stress on unit compressor Page 24 Fan Switch In AUTO or INT intermittent mode the blower operates only when the thermostat calls for heating or cooling This mode is generally preferred when humidity control is a priority The ON or CONT mode provides continuous indoor blower operation regardless of whether the compressor or auxiliary heat are operating This mode is required when constant air circulation or filtering is desired System Switch Set the system switch for heating cooling or auto operation The auto mode allows the heat pump to automatically switch from heating mode to cooling mode to maintain predetermined comfort settings Many heat pump thermostats are also equipped with an emergency heat mode which locks out heat pump operation and provides temporary heat supplied by the auxiliary heat Indicating Light Most heat pump thermostats have an amber light which indicates when the heat pump is operating in the emergency heat mode Temperature Indicator The temperture indicator displays the actual room temperature Programmable Thermostats Your system may be controlled by a programmable thermostat These thermostats provide the added feature of programmable time of day set points for both heating and cooling Refer to the user s information manual provided with your particular thermostat for operation details 506470 01 Issue 1007 Preservice Check If your system fails to operate check the f
40. rant has been added for detection refrigerant requirements will vary with lenths Check all joints for leaks Purge nitrogen and R410A mixture Correct any leaks and rechecks Evacuation Evacuating the system of noncondensables is critical for proper operation of the unit Noncondensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Noncondensables and water vapor combine with refrigerant to produce substances that corrode copper piping and compressor parts A WARNING Do Not use a compressor to evacuate a system Avoid deep vacuum operation Extremely low vacuums can cause internal arcing and compressor failure Danger of equipment damage Damage caused by deep vacuum operation will void warranty Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns Use an instrument that reads down to 50 microns 1 Connect the manifold gauge set to the service valve ports as follows Low pressure gauge to suction line service valve High pressure gauge to liquid line service valve 2 Connect micron gauge 3 Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set Page 11 4 Open both manifold valves and start vacuum pump 5 Evacuate the line set and indoor unit to a minimum of 500 microns or lower During the early stages of evacuation itis desirable to close
41. refrigeration or air con ditioning systems Oxygen will explode on contact with oil and could cause personal injury or death Using an Electronic Leak Detector 1 Connect the high pressure hose of the manifold gauge set to the suction valve service port Normally the high pressure hose is connected to the liquid line port however connecting it to the suction ports helps to protect the manifold gauge set from damage caused by high pressure 2 With both manifold valves closed connect the cylinder of R410A refrigerant Open the valve on the R410A cylinder vapor only 506470 01 Issue 1007 3 Open the high pressure side of the manifold to allow R410A into the line set and indoor unit Weigh in a trace amount of R410A A trace amount is a maximum of 2 oz of refrigerant or 3 lbs pressure Close the valve on the R410A cylinder and the valve on the high pressure side of the manifold gauge set Disconnect the R410A cylinder 4 Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set When using high pressure gas such as nitrogen for this purpose be sure to use a regulator that can control the pressure down to 1 or 2 psig 5 Adjust nitrogen pressure to 150 psig Open the valve on the high side of the manifold gauge set to pressurize the line set and the indoor coil 6 After a short period of time open a refrigerant port to make sure that an adequate amount of refrige
42. set isolation Figure 6 shows how to install line sets on horizontal runs Figure 7 shows how to make a transition from horizontal to vertical Figure 8 shows how to install line sets on vertical runs Refrigerant Line Set Diameters in Liquid Line Line Set Length and Size Suction Line Line Set Length and Size For installations exceeding 50 contact Technical Services BTUH Table 2 506470 01 Brazing Connection Procedure 1 Cut ends of refrigerant lines square free from nicks or dents Debur the ends The pipe must remain round do not pinch end of line 2 Before making line set connections use dry nitrogen to purge the refrigerant piping This will help to prevent oxida tion and the introduction of moisture into the system 3 Use silver alloy brazing rods 5 or 6 silver alloy for copper to copper brazing or 45 silver alloy for copper to brass or copper to steel brazing which are rated for use with R410A refrigerant 4 Remove the Schrader core assemblies before brazing to protect them from damage due to extreme heat Replace the cores when brazing is complete 5 Remove light maroon washers from service valves and shield light maroon stickers to protect them during brazing Wrap a wet cloth around the valve body and copper tube stub to protect it from heat damage Outside Unit Placement amp Installation Install unit away from windows Two 90 elbows installed
43. tat demand TRIP signal Y1 is present Red but the compressor is not running Long Run Time Compressor is ALERT running Yellow extremely long run Flash cycles Code 1 Not applicable on heat pump models System Pressure Trip Discharge or suction pressure out of limits or compressor overioaded 506470 01 1 Compressor protector is open Check for high head pressure Check compressor supply voltage 2 Outdoor unit power disconnect is open 3 Compressor circuit breaker or fuse s is open 4 Broken wire or connector is not making contact 5 Low pressure switch open if present in system 6 Compressor contactor has failed open 1 High head pressure Check high pressure switch if present in system Check if system is overcharged with refrigerant Check for non condensable in system 2 Condenser coil poor air circulation dirty blocked damaged 3 Condenser fan is not running Check fan capacitor Check fan wiring and connectors Check fan motor for failure or blockage 4 Return air duct has substantial leakage 5 If low pressure switch present in system check Flash Code 1 info Table 10 Issue 1007 Page 20 Every time the module powers up the last ALERT LED flash 24VAC Power Wiring code that occurred prior to shutdown is displayed for The diagnostic module requires a constant nominal 24VAC 60 seconds The module will continue to display the previous power supply The wiring to the module s R and C ter
44. th outdoor ambient and liquid temperatures Table 7 506470 01 Issue 1007 Page 16 Normal Operating Pressures Low Capacity Temp F L Liquid S Suction Values provided above are typical pressures Indoor unit matchup indoor air quality equipment and indoor load will case pressures to vary Table 8 506470 01 Issue 1007 Page 17 OPERATION Outdoor unit and indoor blower cycle on demand from the room thermostat When the thermostat blower switch is moved to the ON position the indoor blower operates continuously Filter Drier The unit is equipped with a large capacity bi flow filter which keeps the system clean and dry If replacement is necessary replace with one of similar design and capacity The replacement filter drier must be suitable for use with R410A refrigerant Crankcase Heater If unit is equipped with a crankcase heater it should be energized 24 hours before unit start up to prevent compressor damage as a result of slugging Emergency Heat Function Room Thermostat An emergency heat function is designed into some room thermostats This feature is applicable when isolation of outdoor unit is required or when auxiliary electric heat is stage by outdoor thermostats When the room thermostat is placed in the emergency heat position the outdoor unit control circuit is isolated from power and the field supplied relays bypass the outdoor thermostats An amber indicating light simultaneously comes o
45. tings are available from the manufacturer See Table 3 for proper TXV for each unit TXV Data MODEL PART NUMBER 4HP18LT 24 H4TXV01 4HP18LT 36 H4TXV02 4HP18LT 48 60 HATXV03 Table 3 To install an expansion valve See Figure 10 above 1 Separate the distributor assembly and remove the piston orifice and used teflon seal Insert nozzle end of the expansion valve along with a new teflon seal into the distributor and tighten to 20 30 ft lbs Use backup wrench on all wrench flats Overtightening will crush the teflon seal and may cause a leak 2 Attach liquid line portion of distributor assembly along with new teflon seal to the inlet of the expansion valve Tighten to 20 30 ft lbs Use backup wrench on all wrench flats Overtightening will crush the teflon seal and may cause a leak Page 9 3 Connect the external equalizer line to the equalizer port on the suction line and tighten to 8 ft lbs 4 Strap the superheat sensing bulb to the suction header If installing an expansion valve on an indoor coil that previously used a fixed orifice be sure to remove the existing fixed orifice Failure to remove a fixed orifice when installing an expansion valve to the indoor coil will result in improper operation and damage to the system Manifold Gauge Set Manifold guage sets used with systems charged with R410A refrigerant must be capable of handling the higher system operating pressures The gauges should be rate
46. ure 6 506470 01 Issue 1007 es Page 6 Refrigerant Line Sets Transition from Vertical to Horizontal Automotive Anonorad Muffler Type Heavy Nylon Wire Tie Strap Liquid 2 1 Line to Vapor 11 Strap Liquid Line Line to Vapor Line Liquid Line Liquid Line Vapor Line Wrapped Metal SI i Vapor Line Wrapped nm Armangx Metal Sleeve in Armaflex Figure 7 Refrigeraant Line Sets Installing Vertical Runs new construction shown IMPORTANT Refrigerant NOTE Similar installation practices lines mustnot contact wall should be used if line setis to be Outside Wall installed on exterior of outside wall Vapor Line Liquid Line Wood Block Between Studs 1 29 l Wire Tie Md Inside Wall Strap Sleeve 4 7 Vapor Line Wrapped with Armaflex rj wire Tie Liquid Line IMPORTANT Outside Wall Wood Block Refrigerant lines must not contact structure Wire Tie Strap Caulk PIT UV 7777 PVC Pipe Fiberglass Insulation 77 Sleeve Figure 8 506470 01 Issue 1007 Page 7 Flushing Existing Line Set and Indoor Coil This pro
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