Service Manual
Contents
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3. 20 esp change connections as shown For field selected 80 esp P12 60 esp change connections as shown FAN MOTOR 11 The motor does not run Check for the proper line voltage power supply and ground at the L G and N connections Correct any voltage issues before proceeding to the next step Speed selections on the blower motor are done by 24 volt supply to the motor terminals The low voltage connections are pro grammed for the operating characteristics as shown in the chart above Turn the indoor unit on and set to any mode that will normally run the fan Heat Cool or Fan If there is no 24 volt power supply between terminals 2 3 or 4 and C common check the wire s from the relays located in the control box If the line voltage supply is within range and 24 volts is supplied to any of the connector combinations shown in the chart above and the motor does not operate replace the motor 17 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 7 3 Switch Settings Operation by switch Switch Pole Function on Sm Remarks Thermistor Intake temperature are 1 detection position Built in remote controller Indoor unit Address board 2 Filter clogging detection
4. Check the continuity across the contact If there is no continuity across the contact replace the relay If there is continu ity across the contact the relay is OK Refer to the motor troubleshooting section Linear expansion Disconnect the connector then measure the resistance valve using a tester valve Refer to the next page for a detail 1 Normal Abnormal 2 3 1 5 2 6 3 5 4 6 4 White Red Yellow Brown Orange Red Blue Brown Open or short 5 150 10 6 14 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc Thermistor Characteristic graph Thermistor for lower temperature Room temparature thermistor TH21 m lower temperature Liquid pipe thermistor TH22 Gas pipe temparature thermistor TH23 40 Thermistor 15 3 e Fixed number of B 3480k 2 30 Rt 15exp 3480 __ _ ____ 5 2734 273 8 32 F 15k 10 C 50 F 9 6k 20 C 68 F 6 3k 25 77 F 5 2k 10 30 C 86 F 4 3k 40 104 3 0k 0 20 10 0 10 20 30 40 50 4 14 32 50 68 86 104 122 F Temperature
5. Cooling Heating capacity indicates the maximum value at operation under the following conditions Cooling Indoor 80 F 27 C DB 67 F 19 C WB Outdoor 95 F 35 C DB Heating Indoor 70 F 21 C DB Outdoor 47 F 8 C DB 43 F 6 WB 2 Airflow rate sound pressure levels at low mid high fan speed 3 Measured at medium static setting 7 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 3 2 Electrical Parts Specifications Model PVFY PVFY PVFY PVFY PVFY PVFY PVFY Parts Symbol P12E00B P18E00B P24E00B P30E00B P36E00B P48E00B P54E00B name Transformer T1 Primary 240V 60Hz Secondary 23 5V 0 9A Transformer 2 Primary 208 230V 60Hz Secondary 27V Room temperature TH21 Resistance O C 32 F 15k 10 C 5O F 9 6k 20 C 68 F 6 3k 25 C 77 F 5 4k thermistor 30 C 86 F 4 3k 40 C 104 F 3 0k Liquid pipe Resistance 0 C 32 F 15k 10 C 5O F 9 6k 20 C 68 F 6 3k 25 C 77 F 5 4k thermistor 30 C 86 F 4 3k 40 C 104 F 3 0k Gas pipe TH23 Resistance 0 C 32 F 15k 10 C 50 F 9 6k 20 C 68 F 6 3k 25 C 77 F 5 4k thermistor 30 C 86 F 4 3k 40 C 104 F 3 0k Fuse Indoor controller FUSE 250V 6 3A board Fan motor 4 pole 4 pole 4 pole 4 pole 4 pole 4 pole 4 pole with Inner 1 1 3 hp 1 3 hp 1 3 hp 1 3 hp 1 2 hp 3 4 hp 3 4 hp
6. H2 elbows and other joints in a plastic bag Sor FS1 J p bag 208V 230V 60Hz R oo D U f dust or water enters the refrigerant cycle deterioration of 5 9 seu e the oil and compressor trouble may result a 26H e Use ester oil ether oil or alkylbenzene small amount as the 4 88 refrigerator oil to coat and flange connections Control board The refrigerator oil will degrade if it is mixed with a large amount of EN mineral oil CN24 Useliquid refrigerant to fill the system If gas refrigerant is used to seal the system the composition of 91 2 Thermal fuse the refrigerant in the cylinder will change and performance may H1 H2 Heater drop 26H Overheat protection e Do not use a refrigerant other than R410A thermostat If another refrigerant R22 etc is used the chlorine in the refrig Electromagnetic contactor erant may cause the refrigerator oil to deteriorate e Use a vacuum pump with a reverse flow check valve The vacuum pump oil may flow back into the refrigerant cycle and cause the refrigerator oil to deteriorate Donotuse the following tools that are used with conventional refrigerants Gauge manifold charge hose gas leak detector reverse flow check valve refrigerant charge base vacuum gauge refriger ant recovery equipment If the conventional refrigerant and refrigerator oil are mixed in the R410A the refrigerant may deteriorated If water
7. Linear expansion valve CD Operation summary of the linear expansion valve Linear expansion valve open close through stepping motor after receiving the pulse signal from the indoor controller board Valve position can be changed in proportion to the number of pulse signal Connection between the indoor controller board and the linear expasion valve Controller board DC12V Linear expansion valve Brown 4 Ble Red 04 6 i 93 5 2 1 4 3 dil 02 Yellow White Red Orange T 01 White Connector CN60 15 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc Output pulse signal and the valve operation 3 4 1 2 1 4 1 When linear expansion valve operation stops all output phase At phase interruption or when phase does not shift in order motor does not rotate smoothly and motor will locks and vibrates When the switch is turned on 2200 pulse closing valve signal will be send till it goes to amp point in order to define the valve When the valve move smoothly there is no noise or vibration occurring from the linear expansion valve however when the pulse number moves from to or when the valve is locked more noise can be heard than normal situation Noise can be detected by placing the ear against the screw dri ver handle whil
8. ON OFF 1 Set Temperature Button 5 2 Timer Menu Button Monitor Set Button 6 3 Mode Button 7 Return Button 8 4 Timer On Off Button Set Day Button 9 ment of room temperature 0 Louver Button Operation Button Fan Speed Button Airflow Up Down Button Ventilation Button Operation Button Check Clear Button Ne result in the erroneous measurement of room temperature B D Never expose the remote controller to direct sunlight Doing so can result in the erroneous measure Never place any obstacle around the lower right hand section of the remote controller Doing so can Test run Button Filter Button 44 Button ON OFF Button Position of built in room temperature Set Time Button 2 Specifications subject to change without notice O 2013 Mitsubishi Electric US Inc Display dd MITSUBISHI ELECTRIC THE SUN D THU FAI SAT LID M E arter 170 EULA anen oF ER DE HEY FILTER B 50 ONG Gad Dol 23864 Teme DON QFF n G OL I NHQJ D Current time Timer Centralized control Timer OFF Timer indicator Operation mode COOL ODRY fs FAN Locked indicator Set temperature Power ON Louver Ventilation Filter sign Set ef
9. thermostat Linear DC12V Stepping motor DC12V Stepping motor drive port dimension LEV drive port dimension 64 0 2000 3 2 0 2000pulse EDM 402MD 5 2 0 2000pulse EDM 804MD pulse EDM AOY Power supply TB2 L1 L2 G 330V 30A terminal bed Trans mission TBS 1 2 M1 M2 S 330V 30A terminal TB15 bed 8 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc Units Inches 4 OUTLINES AND DIMENSIONS PVFY P12 18 24E00B MAIA MAIA LNOYS 1391 SNOILO3NNOO TVOLLS3A L ei SNOILO3NNOO NOILO3NNOO AINON 2 NM AINON 2 NOLLO3NNOO 3dld SY9 1 NOIRSSNNOO 2013 Mitsubishi Electric US Inc Specifications are subject to change without notice 191 SDVLIOA MAIA dOL amp M3I WOLLOd L3 INI 2 p 5 9 3ONVHV31O 9L mech 2 L 8 8 6 Ids v m 800381d AJAd vl zn 8003ZId AJAd pezeig pezeJg uuo2 ued ainsseig ubi pinbi 2 seo 1 IPPON Units Inches MAIA MAIA LNOYS MAIA L331 SNOILO3NNOO TVOLLS3A H 4 8z SNOLLO3NNOO p 1V LNOZINOH NOILO3NNOO AINON 2 NOILO3NNOO A
10. INON 2 NOILO3NNOO SV9 1 NOLLO3NNOO 3dld SV9 1 I3 NI MIA dOL 42 SOVLIOA INIT WOLLOd 5 QL NCCJONVHWV3TO NOILVTIVLSNI 8 8 6 80039 d AJAd 8 9 6 8009023 pezeig pezeug 2 eunsseug seo 1 IPON ldd v PVFY P30 36E00B 2013 Mitsubishi Electric US Inc Specifications are subject to change without notice 10 PVFY P48 54E00A Units Inches I3INI SSK KKK __ 65559509040 ees NOILLVTIVLSNI MAIA dOL Li MAIA LNOYS SNOLLOSNNOO SNOILOANNOO IWLNOZIYOH NOLLO3NNOO 3dld AINON Z NOLLO3NNOO SV9 1 LAINI ADVLIOA LAINI y 1391 MAIA WO LLOS 8 6 8 6 g003tSd A4 d ldd gic 8 S 80038td AJAd uuo ginsseig pinbr Z eunsseJd seo spon 2013 Mitsubishi Electric US Inc Specifications are subject to change without notice 11 5 WIRING DIAGRAM
11. If a different refrigerant or air is mixed with the original refrigerant the refrigerant cycle may malfunction and the unit may be dam aged If the air conditioner is installed in a small room measures must be taken to prevent the refrigerant concentration from exceeding the safety limit even if the refrigerant should leak Consult the dealer regarding the appropriate measures to pre vent the safety limit from being exceeded Should the refrigerant leak and cause the safety limit to be exceeded hazards due to lack of oxygen in the room could result When moving and reinstalling the air conditioner consult the dealer or an authorized technician If the air conditioner is installed improperly water leakage elec tric shock or fire may result After completing installation work make sure that refrigerant gas is not leaking If the refrigerant gas leaks and is exposed to a fan heater stove oven or other heat source it may generate noxious gases Do not reconstruct or change the settings of the protection devices If the pressure switch thermal switch or other protection device is shorted and operated forcibly or parts other than those specified by Mitsubishi Electric are used fire or explosion may result Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 45 Warning 2 Precautions for devices that use Note the following when building a heater in the air 1 condit
12. Inc Switch Operation by switch Remarks Swit Address board 1st digit swi2 5011 Address can be set while the address Address setting should be done when network setting Gon remote controller PAR F25MA is being used is stopped Korey 9 At delivery SW12 gt 10 swi2 SW 2nd digit UE address setting 1 514 5 SW14 Connect AT This is the switch to be used when the indoor Address board ion No 2 AA unit is operated with R2 series outdoor unit as setting INA a set At delivery 9 SW14 Note 1 AIN OF Note 1 The DipSW setting is effective while the unit is not operating remote controller OFF for SW 11 12 14 and 5 19 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc MANUFACTURED FOR MITSUBISHI ELECTRIC US INC Specifications are subject to change without notice O 2013 Mitsubishi Electric US Inc
13. MANUFACTURED FOR 201 3 MITSUBISHI ELECTRIC US INC TECHNICAL amp SERVICE MANUAL Series PVFY Vertical Concealed Indoor Unit B PVFY P12E00B PVFY P18E00B PVFY P24E00B PVFY P30E00B PVFY P36E00B PVFY P48E00B PVFY P54E00B CONTENTS SAFETY PRECAUTIONS 1 1 eadein 3 2 PART NAMES AND FUNCTIONS 4 3 SPECIFICATION eren 7 4 OUTLINES AND 5 WIRING DIAGRAM 6 REFRIGERANT SYSTEM DIAGRAM ds 7 TROUBLESHOOTING 14 For use with R410A only SAFETY PRECAUTIONS 1 Before installation and electric work Before installing the unit make sure you read all the Safety precautions The Safety precautions provide very important points regarding safety Make sure you follow them This equipment may not be applicable to EN61000 3 2 1995 and EN61000 3 3 1995 This equipment may have an adverse effect equip ment on the same electrical supply system Please report to or take consent by the supply au thority before connection to the system Symbols used in the text A Warning Describes precautions that should be observed to prevent danger of injury or death to the user A Caution Describes precautions that should be observed to prevent damage to the unit Symbols used in the illustrations Indic
14. NOO TWNINYAL NOISSINSNVH D ALOWSY YW OL 18 PVFY P12 WNINYAL NOISSIIWSNVHL e660 enig dNO ILO6HNZ POX SOX 5 o 109 40 111 19 90 LOX Pey LENO OLIEN puz ens WNO 22 0 e29 eu LSND IMS tMS cMS ZMS 5 8 6 SMS ai ooooooo beers 1 40 NOL LOAS ACISNI Specifications are subject to change without notice 12 2013 Mitsubishi Electric US Inc 6 REFRIGERANT SYSTEM DIAGRAM Gas pipe thermistor TH23 E Gas pipe Liquid pipe thermistor TH22 Heat exchanger Linear expansion valve Strainer 100mesh Room temparature thermistor TH21 Strainer 100mesh Flare connection mm lt in gt Han Capacity PVFY P12 18E00B Gas pipe R410A 0 12 7 1 2 Liquid pipe R410A 0 6 35 1 4 mm lt in gt iiem Capacity PVFY P24 30 36 45 54E00B Gas pipe R410A 0 15 88 5 8 Liqu
15. Provided Not provided At delivery ilter life r r OFF 3 Filter lif 2 500h 100h 12345678910 4 Air intake Effective Not effective 5b Remote indication switching Thermostat ON signal indication Fan output indication ode Selection 6 control Always operated while the heat is ON Operated depends on the condition 7 flow Low Extra low eat thermostat etting air flow eset to 8 H h OFF Setti ir fl R SW1 7 0 Auto reset function Effective Not effective 10 Power ON OFF Effective Not effective Indoor controller board MODELS Sw2 MODELS SW2 MODELS SW2 Set while the unit is off SW2 PVFY ON PVFY PVFY Capacity 12 00 ad 123456 P30E00B D 123456 48 00 m 123456 At delivery 1 6 CO de HUE on en on for each capacity setting P18E00B 123456 P36E00B 123456 P54E00B 123456 PVFY ON 24 00 O Indoor controller board SW3 MODELS SW3 MODELS SW3 et while the unit IS Function 1 10 pvry pea 1 2 18 36 Selection 1234567591 48 94E00B 12345678910 SW4 PVFY P12 54E00B Indoor controller board Unit 4 4 ON Set while the unit is off OFF At delivery Selection 1234 5 Note DipSW setting is effective during unit stopping remote controller OFF for SW1 2 3 and 4 commonly and the power source is not required to reset 18 Specifications are subject to change without notice 2013 Mitsubishi Electric US
16. ates an action that must be avoided Q Indicates that important instructions must be followed e Indicates a part which must be grounded A Indicates that caution should be taken with rotating parts This symbol is displayed on the main unit label Color Yellow Beware of electric shock This symbol is displayed on the main unit label Color Yellow AN Warning Carefully read the labels affixed to the main unit Warning Ask the dealer or an authorized technician to install the air con ditioner Improper installation by the user may result in water leakage elec tric shock or fire Install the air unit at a place that can withstand its weight Inadequate strength may cause the unit to fall down resulting in injuries Use the specified cables for wiring Make the connections se curely so that the outside force of the cable is not applied to the terminals Inadequate connection and fastening may generate heat and cause a fire Prepare for typhoons and other strong winds and earthquakes and install the unit at the specified place Improper installation may cause the unit to topple and result in injury Always use an air cleaner humidifier electric heater and other accessories specified by Mitsubishi Electric Ask an authorized technician to install the accessories Improper installation by the user may result in water leakage electric shock or fire Never r
17. e putting the screw driver to the linear expansion Output Output Phase 2 3 Closing a valve 1 2 Opening a valve 4 3 01 OFF OFF The output pulse shifts in above order 02 ON become OFF 3 OFF ON ON OFF 2 24 Linear expansion valve operation Ov DO position 9 5 S valve S Open 2000 pulse 5 Opening valve all the way M6 Pulse number Extra tightning 80 100pulse Trouble shooting 16 Symptom Check points Countermeasures Operation circuit fail ure of the micro processor Disconnect the connector on the controller board then con nect LED for checking DpD 1k LED Pulse signal will be sent out for 10 seconds as soon as the main switch is turn on If there is LED with lights on or lights off it means the operation circuit is abnormal NURO Exchange the indoor con troller board at drive circuit failure Linear expansion valve mechanism is locked Motor will idle and make ticking noise when motor is operated while the linear expansion valve is locked This ticking sound is the sign of the abnormality Exchange the linear expansion vale Short or breakage of the motor coil of the linear expansion valve Measure the resistance between the each coil red white red orange brown yellow brown blue using a tester 15 normal if the resistance is in the range of 150 10 Exchange the li
18. epair the unit If the air conditioner must be repaired consult the dealer If the unit is repaired improperly water leakage electric shock or fire may result Do not touch the heat exchanger fins Improper handling may result in injury When handling this product always wear protective equipment EG Gloves full arm protection namely boiler suit and safety glasses Improper handling may result in injury If refrigerant gas leaks during installation work ventilate the room If the refrigerant gas comes into contact with a flame poisonous gases will be released Install the air conditioner according to this Installation Manual If the unit is installed improperly water leakage electric shock or fire may result Have all electric work done by a licensed electrician according to Electric Facility Engineering Standard and Interior Wire Regulations and the instructions given in this manual and al Ways use a special circuit If the power source capacity is inadequate or electric work is per formed improperly electric shock and fire may result Securely install the cover of control box and the panel If the cover and panel are not installed properly dust or water may enter the outdoor unit and fire or electric shock may result When installing and moving the air conditioner to another site do not charge the it with a refrigerant different from the refrig erant R410A specified on the unit
19. fective for 1 hr Sensor position Room temperature Airflow Fan speed QZ 6 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 3 SPECIFICATIONS 3 1 PVFY P E00B Specifications PVFY P E00B Specifications Model Name PVFY PVFY PVFY PVFY PVFY PVFY PVFY P12E00B P18E00B P24E00B P30E00B P36E00B P48E00B P54E00B Power Source ___________ Power Source ___________ 1 phase 208 230V 60Hz Cooling Capacity Btu h 1 12 000 18 000 24 000 30 000 36 000 48 000 54 000 Heating Capacity Btu h 1 13 500 20 000 27 000 34 000 40 000 54 000 60 000 maon 59 a 2m 2m as J pe qe E Heat SS Aluminum Fin and Copper Tube Type x ITpexQy Forward Curved Blower x 1 Airflow Rate 2 341 391 431 508 504 642 702 844 829 1001 1072 1310 1224 1519 469 559 716 901 1066 1414 1585 External Static Size P12 0 20 0 40 0 60 Sizes P18 P54 0 30 0 50 0 80 Motor Motor Tye High Efficiency DC ECM 33 33 34 35 35 36 37 38 39 37 39 39 37 38 39 38 39 39 40 42 42 Power dB A 47 A7 48 49 49 50 51 52 54 51 53 54 51 53 53 52 53 54 54 56 57 Liquid High Inches 1 4 3 8 Pressure Refrigerant Brazed Pipe Dimensions Gas Caw Inches 1 2 5 8 Pressure Brazed Secondary Dimension Secondary 3 4 FPT Notes 1
20. id pipe R410A 0 9 52 3 8 Electrical Component Location Fan Speed Circuit Board Relays 5 5 5 IS fels T1 T2 i 6 12 E 24 VAC 27 VAC Line Voltage TB15 TB5 Terminal Strip Terminal Terminal Transformers 208 230V 1ph 13 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 7 TROUBLESHOOTING 7 1 How to check the parts Parts name Check points Room temparature Disconnect the connector then measure the resistance using a tester thermistor TH21 Sorrounding temperature 10 30 50 86 Liquid pipe thermistor TH22 N ormal Abnormal Gas pipe thermistor Refer to the thermistor TH23 4 3k 9 6k Open or short Transformer 24V Disconnect the connector and measure the resistance using a tester NP id Normal Abnormal 1S eo CNT 1 3 App 45 2 8 E 2 Open or short 3 3 1 3 1 White Blue Transformer 27VAC Make sure the proper transformer lead is connected for the proper supply voltage See diagram at left For 208V power supply Switch the transformer lead marked 230V with the one marker 208V Reattach 7 wire nut to bare wire Measure the supply voltage to the transformer The supply voltage should be between 187 and 229 volts if the transformer is connected to a 208 volt power 1208 230VAC
21. ioning system R41 0A refrigerant Leave enough space between units for proper ventilation so that the indoor unit temperature does not exceed 40 when windless Keep the heater clean and take appropriate measures so that the indoor unit does not suck in the dust particles that Caution Donotuse the existing refrigerant piping The old refrigerant and refrigerator oil in the existing piping con tains a large amount of chlorine which may cause the refrigerator accumulate on the heater oil of the new unit to deteriorate Use the optional heater cable PAC YU25HT to perform an Userefrigerant piping made of C1220 Cu DHP phosphorus interlocked operation with indoor units deoxidized copper as specified in the JIS H3300 Copper and Do not build a heater inside the indoor unit copper alloy seamless pipes and tubes In addition be sure that the inner and outer surfaces of the pipes are clean and free of hazardous sulphur oxides dust dirt shaving particles Recommended circuit oils moisture or any other contaminant Contaminants on the inside of the refrigerant piping may cause Wiring diagram the refrigerant residual oil to deteriorate 88H JIS Japanese Industrial Standard O0 0 Storethe piping to be used during installation indoors and keep 1 phase power s 00 40 U both ends of the piping sealed until just before brazing Store supply 88H
22. is mixed in the R410A the refrigerator oil may deteriorate Since R410A does not contain any chlorine gas leak detectors for conventional refrigerants will not react to it Donotuse a charging cylinder Using a charging cylinder may cause the refrigerant to deteriorate Beespecially careful when managing the tools If dust dirt or water gets in the refrigerant cycle the refrigerant may deteriorate 3 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 1 FEATURES Series PVFY Vertical Concealed Indoor Unit Indoor unit Cooling capacity Heating capacity Models kW Btu h PVFY P12E00B 3 5 4 0 12 000 13 500 PVFY P18E00B 5 3 5 9 18 000 20 000 PVFY P24E00B 7 0 7 9 24 000 27 000 PVFY P30E00B 8 8 10 0 30 000 34 000 PVFY P36E00B 10 6 11 7 36 000 40 000 PVFY P48E00B 14 1 15 8 48 000 54 000 PVFY P54E00B 15 8 17 6 54 000 60 000 Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 2 PART NAMES AND FUNCTIONS Indoor Main Unit oO Oo Vertical Remote controller PAR 21MAAU Once the controls are set the same operation mode can be repeated by simply pressing the ON OFF button Operation buttons lt oO Horizontal Left r MITSUBISHI ELECTRIC
23. near expansion valve Valve doesn t close completely thermis tor leaking To check the linear expansion valve operate the indoor unit in fan mode and at the same time operate other indoor units in cooling mode then check the pipe temperature liquid pipe temperature of the indoor unit by the out door multi controller board operation moni tor During fan operation linear expansion valve is closed completely and if there are Thermistor some leaking detecting temperature of the TH21 Linear thermistor will go lower If the detected expansion temperature is much lower than the temper valve ature indicated in the remote controller it means the valve is not closed all the way Itis not necessary to exchange the linear expansion valve if the leakage is small and not making any trouble If large amount of refriger ation is leaked exchange the linear expansion valve Wrong connection of the connector or contact failure Check the color of lead wire and missing terminal of the con nector Disconnect the connector at the controller board then check the continuity Specifications are subject to change without notice 2013 Mitsubishi Electric US Inc 7 2 Fan Motor Troubleshooting Models If the motor rocks back and forth on start up this is normal do not replace the motor The motor may surge if operating outside the design static pressure range Verify that
24. supply The reading should be between 207 and 253 volts if connected to a 230 volt power supply L2 Black N 27 Volte AG With the proper supply voltage the transformer output voltage should be approximately 27 volts If no voltage is measured replace the transformer There are 3 fan relays One relay for each high medium and low speed operation The fan relays have a 208 240 V AC coil that is Fan Relays energized by the circuit board The relay switches a 24 V AC circuit which provides the speed signal for the motor The relay energized will be determined by which speed is selected at the controller 208 230 volt supply To check operation 1 3 5 Common lead Make sure power to the system is on and the unit is not standby mode 1 Select high medium or low speed at the controller 2 At the corresponding relay based on the speed selected check the voltage across the relay coil which is supplied from the circuit board 3 If 208 230 V is measured go on to step 4 If no voltage is measured replace the circuit board 4 If there is voltage present the relay contact should be closed For 208V power supply switch the transformer lead marked 230V with the one marker 208V Reattach 7 wire nut to bare wire 3 L2Black T2 i 5 To check the contact Turn power off Remove the 24 V wires from relay contact 6 Reapply voltage and select the fan speed
25. the system design static matches the selected motor static pressure settings The system is noisy and does not change speeds based on commands from the remote controller or the indoor unit is going into freeze protection cycle Check to make sure the airflow settings are correct for the installation per the indoor unit specifications First remove the system filter and check that all dampers and diffusers are open If after removing the filter this corrects the problem change or clean the filter Also check the indoor unit heat exchanger and clean as necessary If none of this corrects the problem check the static pressure of the system The static pressure should fall within the guidelines given on the airflow charts If it s outside the parameters given on these charts correct airflow problem Make sure the static pressure setting on the motor matches the system requirements If the above checks do not solve the problem check that the supply voltage applied to the motor is correct Measure volt age at the L G N connector shown on the diagram below The motor supply voltage should or 10 of the nominal 208 230VAC rating If the supply voltage is not within this range correct this before any further troubleshooting Fan Relays 24 VAC to rfotor speeds As shipped 50 esp connection P12 40 esp 24 VAC Common 208 230V 60Hz Ground 208 230V 60Hz For field selected 30 esp P12
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