Download Mitsubishi Electric PKH30 Service manual
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OC276-A-1.qxp 03.11.25 9:04 AM Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OC276 REVISED EDITION-A TECHNICAL & SERVICE MANUAL Series PKH Wall Mounted PKH18FL PKH24FL PKH30FL PKH36FL Revision: ●The wrong descriptions in REFRIGERANT SYSTEM DIAGRAM have been modified. (Page 18.) ●The wrong descriptions in WIRING DIAGRAM have been modified. (Page 19.) ●Restrictor valve and capillary tube have been added to "Specifications" of heat exchanger. (Page 48.) ●Please void OC276. CONTENTS 1. FEATURES ·······························································2 2. PART NAMES AND FUNCTIONS ····························3 3. SPECIFICATIONS·····················································4 4. DATA ·········································································5 5. OUTLINES AND DIMENSIONS······························16 6. REFRIGERANT SYSTEM DIAGRAM ····················18 7. WIRING DIAGRAM ·················································19 8. OPERATION FLOW-CHART ··································20 9. MICROPROCESSOR CONTROL···························24 10. TROUBLESHOOTING ············································41 11. DISASSEMBLY PROCEDURE ·······························45 12. PARTS LIST ····························································48 ˚F ˚C STOP AMPM SWING START MANUFAC TU RE R IFIED TO ARI A RT SC CE O AIR -CO Y G WITH YIN PL M NING ITIO ND Remote controller • CE EQ UIP MENT IFI NS C IO AIR ATIO N SE CT 40 S TA N DARD 2 RT C F FAN O CHECK TEST MODEL RUN SELECT NOT AVAILABLE UNIT AR Indoor unit • [Models] L IST ED TM US OC276-A-1.qxp 1 03.11.25 9:04 AM Page 2 FEATURES CHECK TEST MODEL RUN SELECT FAN ˚F ˚C STOP AMPM SWING START NOT AVAILABLE Indoor unit Remote controller Models Cooling capacity / Heating capacity PKH18FL PKH24FL PKH30FL PKH36FL 18,000 24,000 30,000 34,200 / / / / 18,600 25,000 33,000 38,000 [25,100] [31,500] [40,500] [45,500] Btu/h Btu/h Btu/h Btu/h SEER 11.1 10.2 10.6 10.5 1. COMPACT DESIGN The PKH series models have been downsized and now require such minimal wall space that they can even be installed above windows. 2. LCD WIRELESS REMOTE CONTROLLER The new wireless remote controller has a larger easy-to-read temperature display, and executes ON/OFF commands and temperature settings with a press of the button. 3. AUTO FLAP SHUTTER With a simple flick of the OFF switch the air outlet can be closed off with a shutter. The shutter also functions as a flap during operation to adjust the air flow angle, with “Auto Angle 1” securing a comfortable air flow. 4. INSTALLATION : FAST AND EASILY ADAPTABLE (1) Multi-directional piping Multi directional drain and refrigerant piping radically improves flexibility in selecting installation layouts. PKH18/24/30/36FL models boast refrigerant piping in 4 directions and drain piping in 2 directions. (2) Back plate installation guide The back plate installation guide gives clear instructions on installation positions. The enlarged back plate secures the unit firmly to the wall, while the support piece which lifts the unit makes left side piping work much easier. (3) Easily removable filter and convenient wireless remote controller The presence of thumb screws on the filters means that the filters can be quickly and smoothly removed. 5. HIGH RELIABILITY AND EASY SERVICING In addition to the self-diagnostic function, units are also equipped with a 3-minute time delay mechanism (cooling), an auto restart function, an emergency operation function, a test run switch, etc., to assure high reliability and easy servicing. 6. NITROGEN GAS IS CHARGED TO INDOOR UNIT Indoor unit and refrigerant pipes are charged with nitrogen gas (N2) instead of R22 before shipment from the factory. 2 OC276-A-1.qxp 03.11.25 9:04 AM 2 Page 3 PART NAMES AND FUNCTIONS ●Wireless remote controller ● When cover is open. CHECK TEST RUN display CHECK&TEST RUN display indicates that the unit is being checked or test-run. MODEL SELECT display display Blinks when model is selected. Lights up while transmission to the indoor unit is mode using switches. 88°F display SET TEMP. display indicates desired temperature set. CLOCK display OPERATION MODE display OPERATION MODE display Operation mode display indicates which operation mode is in effect. display The vertical direction of air flow is indicated. Displays the current time. COOL DRY AUTO FAN HEAT TIMER display CHECK TEST MODEL RUN SELECT FAN ˚F ˚C STOP AMPM Displays when in timer operation or when setting timer. “ SWING START AMPM NOT AVAILABLE ON/OFF “ TEMP ”“ ” display Displays the order of timer operation. ”“ ” display Displays whether timer is on or off. display button FAN SPEED display indicates which fan speed has been selected. FAN AUTO STOP VANE AUTO START SET TEMPERATURE button sets any desired room temperature. ON/OFF button The unit is turned ON and OFF alternately each time the button is pressed. MODE CHECK LOUVER h FAN SPEED SELECT button Used to change the fan speed. MODE SELECT button TEST RUN SET min RESET Used to switch the operation mode between cooling, drying, fan. TIMER CONTROL buttons AUTO STOP (OFF timer): when this switch is set, the air conditioner will be automatically stopped at the preset time. AUTO START (ON timer): when this switch is set, the air conditioner will be automatically started at the preset time. CLOCK h and min buttons Buttons used to set the “hour and minute” of the current time and timer settings. LOUVER button CHECK-TEST RUN button This switch the horizontal fan motion ON and OFF. Only press this button to perform an inspection check or test operation. Do not use it for normal operation. (Not available for this model.) CLOCK button VANE CONTROL button RESET button Used to change the air flow direction. SET button 3 OC276-A-1.qxp 3 03.11.25 9:04 AM Page 4 SPECIFICATIONS MODELS : PKH18FL, PKH24FL, PKH30FL, PKH36FL Model Item Capacity Cooling *1 Heating *1 Heating *2 Moisture removal Power Consumption EER SEER HSPF COP Cooling *1 Heating *1 Heating *2 *1 Btu/h Btu/h Btu/h Pints/h kW kW kW *1 *2 INDOOR UNIT MODELS External finish V,phase,Hz Power supply A Max.fuse size (time delay) A Min.ampacity F.L.A. Fan motor A(kW) Booster heater CFM Dry Airflow Hi-Lo CFM Wet dB Sound level Hi-Lo in. Unit drain pipe O.D. in. W in. D Dimensions in. H lb Weight OUTDOOR UNIT MODELS External finish V,phase,Hz Power supply A Max.fuse size (time delay) A Min.ampacity F.L.A. Fan motor Model (type) R.L.A. Compressor L.R.A. A(W) Crankcase heater Refrigerant control Defrost method dB Sound level in. W in. D Dimensions in. H lb Weight REMOTE CONTROLLER Control voltage (by built-in transformer) Name Charge REFRIGERANT L Oil <Model> REFRIGERANT PIPING in. Liquid Pipe size in. Gas Indoors Connection Outdoors method Height difference ft Between the indoor ft Piping length & outdoor units PKH24FL PKH18FL PKH30FL PKH36FL 24,000 30,000 25,000[30,500/31,500] 33,000[39,100/40,500] 14,700[20,200/21,200] 19,000[25,100/26,500] 7.0 9.1 2.36 3.12 2.37[3.97/4.27] 3.02[4.82/5.22] 1.92[3.52/3.82] 2.48[4.28/4.68] 10.2 9.6 10.2 10.6 6.8 7.1 3.1 3.2 2.2 2.2 PKH24FL PKH30FL Munsell 3.4Y 7.7/0.8 208/230,1,60 15 18,000 18,600[24,100/25,100] 10,700[16,200/17,200] 5.3 1.79 1.56[3.16/3.46] 1.34[2.94/3.24] 10.1 11.1 7.2 3.5 2.3 PKH18FL 12 0.5 7.6/8.4[1.6/1.9] 710-530 640-480 FK1:48 -41 34,200 38,000[44,100/45,500] 19,600[25,700/27,100] 10.5 3.44 3.54[5.34/5.74] 2.65[4.45/4.85] 9.9 10.5 6.9 3.1 2.2 PKH36FL 13 0.6 8.7/9.6[1.8/2.2] 990-780 890-700 FK1:49-44 FK1:50-46 1-1/16 (or 7/8) 55-1/8 66-5/32 9-1/4 13-3/8 57 PUH18EK 20 16 0.75 RH247NAB 12 37 0.11/0.12[23/28] 53 33-1/2 131 5 lbs 8 oz 0.52 <MS-56> 130 130 57 PUH24EK1 66 66 PUH30EK1 PUH36EK1 Munsell 5Y 7/1 208/230,1,60 20 30 30 16 20 22 0.65+0.65 0.75+0.75 0.75+0.75 NH33NBD NH41NAD NH47NAD 11.5 14.0 17.5 54 73 87 0.16/0.17[33/39] 0.16/0.17[33/39] 0.16/0.17[33/39] Capillary tube Reverse cycle 55 55 55 38-3/16 38-3/16 34-1/4 13-9/16 13-9/16 11-5/8 49-9/16 49-9/16 49-9/16 202 245 246 With indoor unit Indoor unit-remote controller:DC12V. Indoor unit-outdoor unit:DC12V R22 9 lbs 15 oz 10 lbs 2 oz 10 lbs 9 oz 1.2 <MS32N-1> 1.3 <MS32N-1> Not supplied(optional parts) 1/2 1/2 3/8 3/4 3/4 5/8 Flared Flared 164 164 164 164 NOTES : *1.Rating conditions (cooling)-indoor : 80˚FDB,67˚FWB outdoor : 95˚FDB,75˚FWB. (heating)-indoor : 70˚FDB,60˚FWB outdoor : 47˚FDB,43˚FWB. *2.Rating conditions (heating)-indoor : 70˚FDB,60˚FWB outdoor : 17˚FDB,15˚FWB. *3.Heating capacity and power consumption in [ ] includes heater operation at 208/230V. Operating range Indoor intake air temperature Outdoor intake air temperature Maximum 95˚FDB,71˚FWB 115˚FDB Cooling Minimum 67˚FDB,57˚FWB 0˚FDB * Maximum 80˚FDB,67˚FWB 75˚FDB,65˚FWB Heating Minimum 70˚FDB,60˚FWB 17˚FDB,15˚FWB In case of the wind baffle is installed. * (In case of the wind baffle is not installed, the minimum temperature will be 23˚FDB.) 4 OC276-A-1.qxp 03.11.25 9:04 AM 4 Page 5 DATA MODELS : PKH18FL, PKH24FL, PKH30FL, PKH36FL 1. PERFORMANCE DATA 1) COOLING CAPACITY Models Models Airflow (CFM) B.F Outdoor intake air DB temperature(˚F) IWB (˚F) 75 85 95 105 115 TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC 71 21.0 14.4 1.56 20.2 13.9 1.69 19.4 13.3 1.84 18.5 12.7 1.99 17.6 12.1 2.15 67 19.5 16.0 1.52 18.8 15.4 1.65 18.0 14.8 1.79 17.1 14.0 1.93 16.3 13.4 2.07 63 18.2 17.4 1.49 17.5 16.7 1.61 16.8 16.0 1.74 15.9 15.2 1.88 15.1 14.4 2.01 DB 75°F (50%RH) 62.5 18.1 15.5 1.49 17.4 14.9 1.61 16.6 14.3 1.74 15.8 13.6 1.87 15.0 12.9 2.00 DB 72°F (50%RH) 60 17.2 15.1 1.47 16.6 14.5 1.58 15.8 13.8 1.70 15.0 13.1 1.84 14.2 12.4 1.96 DB 70°F (50%RH) 59 16.8 14.5 1.46 16.2 14.0 1.57 15.5 13.4 1.69 14.6 12.6 1.83 13.9 12.0 1.94 71 27.9 16.1 2.05 26.9 15.5 2.23 25.8 14.9 2.43 24.6 14.2 2.63 23.4 13.5 2.84 67 26.1 18.5 2.01 25.1 17.8 2.18 24.0 17.0 2.36 22.9 16.3 2.55 21.7 15.4 2.73 63 710 0.16 PKH18FL 710 0.16 PKH24FL 24.3 20.5 1.97 23.4 19.7 2.12 22.4 18.9 2.30 21.3 18.0 2.47 20.1 17.0 2.65 DB 75°F (50%RH) 62.5 24.1 18.0 1.96 23.2 17.4 2.12 22.2 16.6 2.29 21.1 15.8 2.47 19.9 14.9 2.64 DB 72°F (50%RH) 60 23.0 17.6 1.94 22.1 16.9 2.09 21.1 16.2 2.25 20.1 15.4 2.41 18.9 14.5 2.58 DB 70°F (50%RH) 59 22.5 17.0 1.93 21.7 16.4 2.07 20.7 15.6 2.24 19.7 14.9 2.39 18.5 14.0 2.56 71 34.9 21.5 2.72 33.7 20.8 2.95 32.3 19.9 3.21 30.8 19.0 3.48 29.3 18.1 3.75 67 32.6 24.5 2.66 31.4 23.6 2.88 30.0 22.5 3.12 28.6 21.5 3.37 27.1 20.3 3.61 63 30.4 26.9 2.60 29.2 25.8 2.81 27.9 24.6 3.04 26.6 23.5 3.27 25.1 22.2 3.50 DB 75°F (50%RH) 62.5 30.2 23.8 2.59 29.0 22.9 2.80 27.7 21.9 3.03 26.3 20.7 3.26 24.9 19.6 3.49 DB 72°F (50%RH) 60 28.8 23.2 2.57 27.6 22.2 2.77 26.3 21.2 2.99 24.9 20.1 3.21 23.5 18.9 3.43 DB 70°F (50%RH) 59 28.2 22.4 2.56 27.0 21.5 2.76 25.7 20.4 2.98 24.4 19.4 3.19 22.9 18.2 3.41 71 39.8 23.0 3.00 38.4 22.1 3.25 36.8 21.2 3.54 35.1 20.2 3.83 33.4 19.3 4.13 67 37.1 26.3 2.93 35.7 25.3 3.17 34.2 24.3 3.44 32.6 23.1 3.71 30.9 21.9 3.98 63 34.7 29.3 2.87 33.3 28.1 3.10 31.9 26.9 3.35 30.3 25.6 3.61 28.7 24.2 3.86 DB 75°F (50%RH) 62.5 34.4 25.8 2.86 33.1 24.8 3.09 31.6 23.7 3.34 30.0 22.5 3.59 28.4 21.3 3.85 DB 72°F (50%RH) 60 32.8 25.1 2.82 31.5 24.1 3.04 30.1 23.0 3.28 28.5 21.8 3.52 26.9 20.6 3.76 DB 70°F (50%RH) 59 32.2 24.3 2.81 30.8 23.2 3.03 29.5 22.3 3.26 27.9 21.0 3.50 26.4 19.9 3.73 990 0.15 PKH30FL 990 0.14 PKH36FL Notes 1. B.F. : Bypass Factor, IWB : Intake air wet-bulb temperature TC : Total Capacity (x103 Btu/h), SHC : Sensible Heat Capacity (x103 Btu/h) TPC : Total Power Consumption (kW) 2. SHC is based on 80˚FDB of indoor intake air temperature. 3. Cooling capacity correction factors and Refrigerant piping length (one way) range. Refrigerant piping length (one way) MODEL 25ft 40ft 55ft 70ft 85ft 100ft 115ft 130ft PKH18FL 1.0 0.992 0.983 0.978 0.966 0.959 0.950 0.945 PKH24FL 1.0 0.981 0.968 0.952 0.940 0.925 0.913 PKH30FL 1.0 0.981 0.968 0.952 0.940 0.925 PKH36FL 1.0 0.981 0.968 0.952 0.940 0.925 150ft 164ft 0.900 0.886 0.874 0.913 0.900 0.886 0.874 0.913 0.900 0.886 0.874 5 OC276-A-1.qxp 03.11.25 9:04 AM Page 6 2) HEATING CAPACITY Models PKH18FL PKH24FL PKH30FL PKH36FL Airflow IWB (CFM) (˚F) 710 710 990 990 Auxiliary heater 208V 230V Outdoor intake air WB temperature(˚F) Models 15 25 35 45 55 65 CA PC CA PC CA PC CA PC CA PC CA PC CA PC 75 12.1 1.20 14.1 1.34 16.3 1.49 18.7 1.65 21.4 1.83 23.7 1.99 5.5 1.6 70 12.4 1.16 14.4 1.29 16.7 1.44 19.1 1.59 21.8 1.76 24.1 1.91 65 12.7 1.11 14.7 1.24 17.0 1.38 19.5 1.53 22.2 1.69 24.5 1.83 6.5 1.9 75 16.3 1.82 18.9 2.03 21.9 2.27 25.2 2.51 28.8 2.77 32.8 3.01 5.5 1.6 70 16.6 1.76 19.4 1.96 22.4 2.19 25.7 2.42 29.3 2.67 33.3 2.90 65 17.0 1.69 19.8 1.89 22.9 2.10 26.2 2.32 29.9 2.56 33.9 2.78 6.5 1.9 75 21.5 2.32 25.0 2.59 28.9 2.89 33.2 3.20 38.0 3.53 43.2 3.86 6.1 1.8 70 21.9 2.24 25.5 2.50 29.6 2.78 33.9 3.08 38.6 3.40 43.7 3.72 7.5 2.2 65 22.5 2.15 26.1 2.40 30.2 2.68 34.6 2.96 39.4 3.26 44.6 3.56 75 24.7 2.71 28.7 3.04 33.3 3.39 38.2 3.75 43.7 4.14 49.6 4.49 6.1 1.8 70 25.3 2.62 29.4 2.93 34.1 3.26 39.0 3.61 44.5 3.98 50.4 4.28 7.5 2.2 65 25.9 2.53 30.1 2.82 34.8 3.14 39.9 3.47 45.4 3.83 51.3 4.14 Notes 1. IDB : Intake air dry-bulb temperature CA : Capacity (x103 Btu/h), PC : Power Consumption (kW) 2. When booster heater is "on", total capacity and total power consumption should be added the figures described in booster heater column. •Booster heater ON : When the set temperature is higher than the room temperature by more than 5.4 deg. •Booster heater OFF : When the set temperature is higher than the room temperature by less than 3.6 deg. 3. Heating capacity correction factors. Refrigerant piping length (one way) Models Less than 100ft 100~130ft 130~164ft PKH18FL 1.00 0.995 0.990 PKH24FL 1.00 0.995 0.990 PKH30FL 1.00 0.995 0.990 PKH36FL 1.00 0.995 0.990 6 OC276-A-1.qxp 03.11.25 9:04 AM Page 7 2. PERFORMANCE CURVE NOTES : A point on the curve shows the reference point. <PKH18FL> COOLING CAPACITY HEATING CAPACITY Indoor intake air WB temperature ( F) 18 71 67 63 12 Does not include booster heater (1.9kW) 30 65 70 75 24 Indoor intake air DB temperature ( F) 18 12 2.5 71 67 63 2.0 1.5 Indoor intake air WB temperature ( F) 1.0 023 32 35 45 55 65(67) 75 85 95 105 Total power consumption (kW) Total capacity (x10 3 Btu/h) Total power consumption (kW) 24 Total capacity (x10 3 Btu/h) SHF=0.82 30 2.5 75 70 65 2.0 1.5 Indoor intake air DB temperature ( F) 1.0 15 115 Outdoor intake air DB temperature ( F) 25 35 45 55 65 Outdoor intake air WB temperature ( F) <PKH24FL> COOLING CAPACITY 30 24 Indoor intake air WB temperature ( F) 71 67 63 18 Total capacity (x10 3 Btu/h) 36 Total capacity (x10 3 Btu/h) HEATING CAPACITY SHF=0.71 Indoor intake air DB temperature ( F) 30 65 70 75 24 18 12 3.0 71 67 63 2.5 2.0 Indoor intake air WB temperature ( F) 1.5 023 32 35 45 55 65(67) 75 85 95 105 Outdoor intake air DB temperature ( F) 115 7 Total power consumption (kW) Total power consumption (kW) 12 Does not include booster heater (1.9kW) 35 3.0 75 70 65 2.5 2.0 Indoor intake air DB temperature ( F) 1.5 15 25 35 45 55 Outdoor intake air WB temperature ( F) 65 OC276-A-1.qxp 03.11.25 9:04 AM Page 8 NOTES : A point on the curve shows the reference point. <PKH30FL> COOLING CAPACITY SHF=0.75 Total capacity(x10 3 Btu/h) 48 36 30 71 67 63 24 indoor intake air WB temperature(°F) 4.0 Total power consumption(kW) Total capacity(x10 3 Btu/h) 42 Total power consumption(kW) HEATING CAPACITY 71 67 63 3.5 3.0 2.5 2.0 indoor intake air WB temperature(°F) 0 23 32 35 45 55 65 (67) 75 85 95 105 Outdoor intake air DB temperature(°F) 115 Does not include booster heater(2.2kW) 65 70 75 indoor intake air DB temperature(°F) 42 36 30 24 18 4.0 75 70 65 3.5 3.0 2.5 2.0 indoor intake air DB temperature(°F) 1.5 15 25 35 45 55 65 Outdoor intake air WB temperature(°F) <PKH36FL> COOLING CAPACITY SHF=0.71 Total capacity(x10 3 Btu/h) 54 36 71 67 63 30 24 indoor intake air WB temperature(°F) 4.5 Total power consumption(kW) Total power consumption(kW) Total capacity(x10 3 Btu/h) 42 71 67 63 4.0 3.5 3.0 2.5 indoor intake air WB temperature(°F) 0 23 32 35 45 55 65 (67) 75 85 95 105 Outdoor intake air DB temperature(°F) 115 HEATING CAPACITY Does not include booster heater(2.2kW) indoor intake air DB temperature(°F) 48 32 36 30 24 75 70 65 4.5 4.0 3.5 3.0 2.5 indoor intake air DB temperature(°F) 2.0 15 25 35 45 55 Outdoor intake air WB temperature(°F) 8 65 70 75 65 OC276-A-1.qxp 03.11.25 9:04 AM Page 9 3. CONDENSING PRESSURE AND SUCTION PRESSURE Data is based on the condition under indoor humidity 50%. Air flow should be set at HI. A point on the curve shows the reference point. <PKH18FL> COOLING MODE 86 80 75 70 (psi.G) 100 86 80 75 70 90 Suction pressure Condensing pressure (psi.G) 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 80 Indoor DB temperature( F) 70 60 50 40 Indoor DB temperature( F) 30 30 40 50 60 70 80 90 Outdoor ambient temperature 100 110 DB( F) 20 30 40 50 60 70 80 90 Outdoor ambient temperature 100 Data is based on the condition under outdoor humidity 75%. A point on the curve shows the reference point. HEATING MODE (psi.G) 350 340 330 320 310 300 290 280 270 260 250 F) 240 e( 230 ur t 75 ra 220 70 pe m 210 65 te B 200 D r 190 oo 180 Ind 170 160 150 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature 80 F) Condensing pressure (psi.G) 75 70 65 50 40 pe r DB te m 60 In do or Suction pressure at ur e( 70 30 20 10 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature 9 110 DB( F) OC276-A-1.qxp 03.11.25 9:04 AM Page 10 Data is based on the condition under indoor humidity 50%. Air flow should be set at HI. A point on the curve shows the reference point. <PKH24FL> COOLING MODE 360 (psi.G) 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 Suction pressure Condensing pressure 86 80 (psi.G) 100 75 70 90 Indoor DB temperature( F) 80 86 80 75 70 Indoor DB temperature( F) 70 60 50 40 30 30 40 50 60 70 80 90 Outdoor ambient temperature 100 20 110 DB( F) 30 40 50 60 70 80 90 Outdoor ambient temperature 100 Data is based on the condition under outdoor humidity 75%. A point on the curve shows the reference point. HEATING MODE (psi.G) 350 340 330 320 310 300 ) 290 (F 280 re u t 270 ra 75 pe 260 m 70 te 250 B 65 D 240 r oo 230 d n 220 I 210 200 190 180 170 160 150 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature e( F) (psi.G) 80 tu r te m 60 40 do or DB 50 In Suction pressure 75 70 65 pe ra Condensing pressure 70 30 20 10 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature 10 110 DB( F) OC276-A-1.qxp 03.11.25 9:04 AM Page 11 Data is based on the condition under indoor humidity 50%. Air flow should be set at HI. A point on the curve shows the reference point. <PKH30FL> COOLING MODE (psi.G) 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 Suction pressure Condensing pressure 86 80 (psi.G) 110 75 100 70 Indoor DB temperature( F) 86 80 75 70 90 Indoor DB temperature( F) 80 70 60 50 40 30 40 50 60 70 80 90 Outdoor ambient temperature 100 110 DB( F) 30 30 40 50 60 70 80 90 Outdoor ambient temperature 100 Data is based on the condition under outdoor humidity 75%. A point on the curve shows the reference point. HEATING MODE (psi.G) 340 330 320 310 300 290 280 F) e( 270 r tu 260 ra 75 pe 250 70 m te 240 65 B D 230 r o o 220 d 210 In 200 190 180 170 160 150 140 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature e( F ) (psi.G) 80 at ur Condensing pressure 70 m pe r te do or 40 DB 50 In Suction pressure 60 75 70 65 30 20 10 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature 11 110 DB( F) OC276-A-1.qxp 03.11.25 9:04 AM Page 12 Data is based on the condition under indoor humidity 50%. Air flow should be set at HI. A point on the curve shows the reference point. <PKH36FL> COOLING MODE 86 80 75 70 Condensing pressure (psi.G) 90 86 80 75 70 80 Suction pressure (psi.G) 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 Indoor DB temperature( F) 70 Indoor DB temperature( F) 60 50 40 30 20 30 40 50 60 70 80 90 Outdoor ambient temperature 100 30 110 DB( F) 40 50 60 70 80 90 Outdoor ambient temperature 100 Data is based on the condition under outdoor humidity 75%. A point on the curve shows the reference point. HEATING MODE (psi.G) 390 380 370 360 350 340 330 320 310 ) 300 (F e r 290 tu 75 ra 280 70 pe m 270 65 te B 260 D r 250 oo 240 Ind 230 220 210 200 190 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature (F ) (psi.G) 80 pe ra tu re Condensing pressure 70 te m or D 40 B 50 In do Suction pressure 60 75 70 65 30 20 10 20 25 30 35 40 45 50 55 60 65 70 DB( F) Outdoor ambient temperature 12 110 DB( F) OC276-A-1.qxp 03.11.25 9:04 AM Page 13 4. STANDARD OPERATION DATA Models Heating Cooling Heating Cooling Heating Cooling Heating Voltage V 208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230 Frequency Hz Total input kW 1.79 1.56 2.36 2.37 3.12 3.02 3.44 3.54 Indoor fan current A 0.5 0.5 0.5 0.5 0.6 0.6 0.6 0.6 Booster heater current A Outdoor fan current A 0.75 0.75 Comp. current A 7.4/6.9 6.1/5.9 9.3/8.7 9.5/8.7 Condensing pressure psi.G 255 202 240 243 245 236 243 263 Suction pressure psi.G 81 61 75 63 80 60 74 60 Discharge temperature ˚F 182 126 158 149 158 159 160 170 Condensing temperature ˚F 118 102 115 115 115 113 115 120 Suction temperature ˚F 66 34 46 35 49 32 45 33 Comp.shell bottom temperature ˚F 171 111 141 126 138 130 142 148 Ref. pipe length ft Electrical circuit Refrigerant circuit Intake air temperature Indoor side PKH36FL Cooling Refrigerant charge Outdoor side PKH30FL Unit Item Discharge air temperature 60 60 60 7.6/8.4 7.6/8.4 60 8.7/9.6 8.7/9.6 0.65+0.65 0.65+0.65 0.75+0.75 0.75+0.75 0.75+0.75 0.75+0.75 12.6/11.8 12.2/11.4 14.3/13.2 14.7/13.7 25 25 25 25 5 lbs 8 oz 9 lbs 15 oz 10 lbs 2 oz 10 lbs 9 oz DB ˚F 80 70 80 70 80 70 80 70 WB ˚F 67 60 67 60 67 60 67 60 DB ˚F 61 96 58 105 59 103 58 109 WB ˚F 59 68 56 70 58 70 56 71 Fan speed r.p.m. 1,310 1,310 1,400 1,400 Airflow (High) CFM 710 710 990 990 Intake air temperature DB ˚F 95 47 95 47 95 47 95 47 WB ˚F 75 43 75 43 75 43 75 43 Fan speed upper/lower r.p.m. 790 750/750 760/760 760/760 Airflow CFM 1,590 3,170 3,350 3,350 Capacity SHF PKH24FL PKH18FL Btu/h 18,000 18,600 24,000 0.71 0.82 13 25,000 30,000 0.75 33,000 34,200 0.71 38,000 OC276-A-1.qxp 03.11.25 9:04 AM Page 14 5. OPERATING RANGE 1) POWER SUPPLY Min. 198V 1 Phase 60Hz 208/230V Guaranteed voltage range 208V Max. 253V 230V 2) OPERATION Air intake temperature Indoor Outdoor Function Condition DB(˚F) WB(˚F) DB(˚F) WB(˚F) Standard temperature 80 67 95 75 Maximum temperature 95 71 115 — Minimum temperature 67 57 *0 — Maximum humidity 80 75 80 75 Standard temperature 70 60 47 43 Maximum temperature 80 67 75 65 Minimum temperature 70 60 17 15 Cooling Heating * With wind baffle D.B. 23°F if no wind baffle. 6. OUTLET AIR SPEED AND COVERAGE RANGE Model Airflow (CFM) Air speed (ft/sec) Coverage range(ft) PKH18FL 710 16.1 41 PKH24FL 710 16.1 41 PKH30FL 990 17.7 50 PKH36FL 990 17.7 50 The air coverage range is the value up to the position where the air speed is 0.8ft/sec. when air is blown out horizontally from the unit at the High notch position. The coverage range should be used only as a general guideline since it varies according to the size of the room and furniture installed inside the room. 7. ADDITIONAL REFRIGERANT CHARGE (R22(oz)) Refrigerant piping length (one way) Outdoor unit precharged (up to 100ft) 25ft 40ft 55ft 70ft 85ft PKH18FL 5 lbs 8 oz 0 0 0 0 0 0 2 4 PKH24FL 9 lbs 15 oz 0 0 0 0 0 0 2 4 7 9 PKH30FL 10 lbs 2 oz 0 0 0 0 0 0 5 10 16 20 PKH36FL 10 lbs 9 oz 0 0 0 0 0 0 5 10 16 20 Model 100ft 115ft 130ft 150ft 164ft 14 OC276-A-1.qxp 03.11.25 9:04 AM Page 15 6. NOISE CRITERION CURVES OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR PKH18FL PKH24FL NOTCH SPL(dB) Hi 48 Lo 41 LINE 3.3ft 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 NC-20 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz NOTCH SPL(dB) Hi 49 Lo 44 PKH30FL PKH36FL OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR Ambient temperature 80˚F Test conditions are based on JIS Z8731 LINE 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 NC-20 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz 15 Unit Wall 3.3ft 16 32-{15/32 hole for bolt 66-{1/4 hole for tapping screw Wall fixture 1-17/32 B 8-27/32 23/32 3-27/32 1-15/32 2-29/32 A 1-3/16 Knock out hole for piping 1-15/32 2-9/16 7-3/32 12-{1/4 Hole for tapping screw 9-7/16 on left-hand side 12-3/8 42-15/16 9-1/4 Air outlet Refrigerant pipe. Drain pipe 9-1/4 Right side Terminal block for control 7-3/4 9-7/16 B Terminal block for power supply Gas pipe 4-7/32 4-3/8 Drain hose O.D.1-1/16(or 7/8) Bolt 19/32 C Knock out hole for right piping Refrigerant pipe. Drain pipe Liquid pipe 3/8F Gas pipe 5/8F 2-5/32 4-23/32 (Gas pipe) 7-7/32 (Liquid pipe) Change vane (manual) Under panel Removable at left-hand side piping Knock out hole for under-piping 44-3/32 21-23/32 Auto vane Lower side Drain hose Liquid pipe 1-25/32 Air intake 55-1/8 Front 1-25/32 9-1/4 Top 43-11/16 9-1/4 1-25/32 21-23/32 Air outlet 9-1/4 3-17/32 Rear piping opening 3-19/32 Range for left rear piping opening 11-1/32 24 on right-hand side 11-7/32 3/4 17-29/32 10x3-19/32=(35-13/16) 35-7/16 Drainage range 23/32 Drainage range Drain hose for 31/32 left-hand side piping Knock out hole for left piping 9-21/32 Unit center 1-15/32 1-17/32 5/32 3-15/16 38-31/32 2-9/16 2-29/32 C 1-3/16 A 13-3/8 13/32 1-3/16 1-5/32 Indoor Unit PKH18FL PKH24FL 3-15/16 5/32 1-17/32 Left side 2-3/8 2-15/32 1/2 5 1-3/18 7-1/4 1-3/16 3-5/32 11-1/32 03.11.25 9:04 AM 1-21/32 2-9/32 OC276-A-1.qxp Page 16 OUTLINES AND DIMENSIONS Unit : inch 1-15/32 41- 15/32 hole for bolt 11-5/8 1-15/32 9-7/16 50 7-3/32 Range for left rear piping hole A 5-/15/16 or less 1-3/16 or more Rear piping hole 11-1/32 12-3/8 29-17/32 11-7/32 3/4 9-21/32 Drainage range on right-hand side Drain hose for left-hand side piping 31/32 Knock out hole for left piping Left side 23-7/16 13x3-19/32=(7-3/16) 35-7/16 3-19/32 Unit center 2-9/16 2-9/16 Range for left rear piping hole 8-27/32 23/32 23/32 Wall fixture Unit out line Drainage range on Left hand side 3-27/32 B C 1-3/16 2-29/32 10 or more Knock out hole for wiring 1-17/32 2-29/32 A 1-3/16 84-{1/4 hole for tapping screw 3-15/16 5/32 1-17/32 2 or more 1-15/32 Air outlet 5/32 3-15/16 for tapping screw 12- 1/4 hole 7-17/32 9-1/4 1-25/32 9-1/4 1-25/32 1 7-7/32 Knock out hole for under-piping Refrigerant pipe .Drain pipe Auto vanes Under panel (Removable at left-hand piping) louvers(manual) Lower side 55-1/8 27-5/16 Air outlet 43-11/16 (Drain hose) Drain hose Terminal block for power supply Terminal block for control 66-5/32 53-15/16 Air Intake Front 9-1/4 1-25/32 9-1/4 1-25/32 27-5/16 Air outlet 9-1/4 Top 2-15/32 2 Knock out hole for right piping 1/2 Air intake 10 or more 1-17/32 Front 13-3/8 13/32 1-3/16 1-3/16 17 7-1/4 1-3/16 3-5/32 1-5/32 11-1/32 9-7/16 B 2-5/32(Gas pipe) 4-23/32(Liquid pipe) 19/32 or less C 4-3/8 Liquid pipe Gas pipe 1/2F 3/4F 3-1/2~ 4 > < 1 Sleeves are available on the market. 3-1/2 Sleeve >< 1 Through hole 1 2 Drain hose O.D.1-1/16(or 7/8) Bolt 4-1/32 9-1/4 Right side PKH30FL PKH36FL 2-3/8 2-9/32 03.11.25 9:04 AM 1-21/32 7-3/4 OC276-A-1.qxp Page 17 Unit : inch OC276-A-1.qxp 03.11.25 9:04 AM Page 18 Remote controller Unit : inch WIRELESS REMOTE CONTROLLER 2-9/32 COOL DRY AUTO FAN HEAT CHECK TEST MODEL RUN SELECT FAN 3/4 ˚F ˚C STOP AMPM SWING START AMPM NOT AVAILABLE TEMP 6-3/8 ON/OFF 6 REFRIGERANT SYSTEM DIAGRAM PKH18FL PKH24FL Refrigerant pipe (option) {5/8" (with heat insulator) Flared connection Strainer Pipe temperature thermistor / Liquid (RT2) Distributor Restrictor valve Refrigerant flow Refrigerant pipe (option) {3/8" (with heat insulator) Flared connection Capillary tube PKH18FL : ({0.126x{0.071x19.7) PKH24FL : ({0.157x{0.079x19.7) w PKH30FL PKH36FL Strainer Pipe temperature thermistor / Liquid (RT2) Distributor Restrictor valve Refrigerant pipe (option) {3/4" (with heat insulator) Flared connection Refrigerant pipe (option) {1/2" (with heat insulator) Flared connection Capillary tube PKH30FL : ({0.157x{0.079x23.6) PKH36FL : ({0.157x{0.079x15.7) 18 HEATING COOLING w An error in this diagram has been modified. The size of capillary tube {0.157x{0.07x19.7, was wrong. OC276-A-1.qxp 03.11.25 9:04 AM 7 Page 19 WIRING DIAGRAM MODELS PKH18FL, PKH24FL, PKH30FL, PKH36FL WIRING DIAGRAM H FS2 FS1 1 2 RED 5 BLU 6 MV TB2 RED BLU GRN/YLW 3 2 1 123 P.B L1 L2 GR W.B BZ 6 9 BLK WHT RED BLU BLK WHT RED WHT BLK POWER 1 3 CNDK 1 3 135 (WHT) F2 CNB POWER CND 1 2 VANE (RED) CN2D CN6V F1 (WHT) (WHT) SW3 ON OFF 12 SW8 SW1 SW5 ON OFF 12 345 SW6 ON OFF MODELS SW7 18FL 24FL ON OFF ON OFF 12 3 30FL ON OFF 12 3 1 234 36FL P.B I.B C MF CN2L CN51 FC SW1 SW2 SW3 SW5 SW6 SW7 SW8 SW9 X4 F1,F2 ZNR LED1 LED2 3 2 1 12 123 12 12 PIPE CN21 (WHT) BRN 3 ORN 2 YLW 1 LED1 SW1 SW2 RU TB4 TRANSMISSION WIRES DC12V 3 2 1 TB3 OUTDOOR UNIT RT2 RT1 26H 5 GRY 8 88H 7 6 GRY 12 3 [LEGEND] SYMBOL OUT INTAKE CN20 LOSSNAY DOOR CN2L CN30 (RED) (BLU) 123 ON OFF 12 3 2 1 HEATER CN24 (YLW) DRAIN CN31 (WHT) 4 3 2 1 REMOCON CN22 (BLU) SW7 ON OFF 1 2345 6 1 234 5678 910 123 456 12 34 CENTRALLY REMOCON POWER CONTROL CN40 CN51 (WHT) SW9 YLW BWN SW2 ON OFF 9 LED1 LED2 WIRELESS CN90 ZNR (WHT) X4 LED2 W.R REMOTE CONTROLLER X4 FC POWER SUPPLY ~(1PHASE) AC208/230V 60Hz GROUND 2 1 C FAN (WHT) 3 RED 4 BLU (DC13.1V) (AC208/230V) CN2S (WHT) CNSK(RED) TRANS MF I.B 88H NAME SYMBOL INDOOR POWER BOARD INDOOR CONTROLLER BOARD CONNECTOR(LOSSNAY) CONNECTOR(CENTRALLY CONTROL) FAN PHASE CONTROL SWITCH(FUNCTION SELECTOR) SWITCH(ADDRESS SELECTOR) SWITCH(EMERGENCY OPERATION) SWITCH(MODEL SELECTOR) SWITCH(TWIN/TRIPLE SELECTOR) SWITCH(MODEL SELECTOR) SWITCH(OPTION) SWITCH(MODEL SELECTOR) RELAY(FAN MOTOR) FUSE(6A/250V) VARISTOR LED(DC12V POWER) LED(DC5V POWER) CAPACITOR(FAN MOTOR) FAN MOTOR NAME VANE MOTOR MV TB2~TB6 TERMINAL BLOCK RT1 ROOM TEMPERATURE THERMISTOR (32˚F /15kΩ, 77˚F /5.4kΩ DETECT) RT2 PIPE TEMPERATURE THERMISTOR/LIQUID (32˚F /15kΩ, 77˚F /5.4kΩ DETECT) WIRELESS REMOTE CONTROLLER W.R W.B WIRELESS REMOTE CONTROLLER BOARD RECEIVING UNIT RU BZ BUZZER LED1 LED(RUN INDICATOR) LED2 LED(HOT ADJUST) SW1 SWITCH(HEATER ON/OFF) SW2 SWITCH(COOLING ON/OFF) HEATER FS1,2 THERMAL FUSE 243˚F ,10A(18,24FL)/16A(30,36FL) H HEATER 26H HEATER THERMAL SWITCH 88H HEATER CONTACTOR NOTES: 1.Since the indoor fan motor(MF)is connected with 230V power,if 208V power is used,change the dip switch(SW8)on the indoor controller board as shown in fig:*1. SW8 SW8 fig:*1 ON ON Indoor fan motor(MF)for 208V. OFF OFF 123456 123456 2.Since the outdoor side electric wiring may change be sure to check the outdoor unit electric wiring for servicing. 3.Indoor and outdoor connecting wires are made with polarities, make wiring matching terminal numbers. 4.Symbols used in wiring diagram above are, :Connector, :Terminal block. 5.Emergency operation If remote controller or microcomputer fails but there is no other trouble emergency operation is possible by setting dip switch(SW3<I.B>) on the indoor controller board. [Check items] (1) Make sure that no other trouble exist in the outdoor unit.Trouble with the outdoor unit prevents emergency operation. (2) Make sure that there is no trouble with the indoor fan. Emergency operation will be continuous run with the power ON/OFF(ON/OFF with the remote controller is not possible). [Emergency operation procedure] (1) Set the dip switch(SW3<I.B>)on the indoor controller board to 1 on and 2 off for cooling and 1 • 2 on for heating. (2) Turn on outdoor unit side circuit breaker,then indoor unit side circuit breaker. (3) During emergency operation indoor fan runs at high speed but auto-vane does not work. (4) Thermostat will not function.Cold air blows out for defrosting during heating thus do not operate defrosting for a long time. (5) Emergency cooling should be limited to 10 hours maximum (the indoor unit heat exchanger may freeze). (6) After every emergency operation,set all dip switches(SW3<I.B>) to OFF. (7) Movement of the vanes does not work in emergency operation,therefore you have to slowly set them manually to the appropriate position. RG79J693H02 19 The drawing has been revised as some errors in WIRING DIAGRAM have been modified. The former drawing number is RG79J693H01. OC276-A-1.qxp 8 03.11.25 9:04 AM Page 20 OPERATION FLOW-CHART MAIN OPERATION START Power circuit breaker 1 NO YES YES Check SW ON twice NO Operation SW ON w 1 YES NO “OFF” timer YES NO NO Set time complete “ON” timer YES YES Set time complete NO YES w 2 NO Trouble NO YES STOP Trouble STOP PROTECTION DEVICE SELF HOLD RELEASE PROTECTION DEVICE SELF HOLD Remote controller operation display Operating mode (COOL) NO Operating mode (DRY) w 3 Remote controller trouble display Remote controller indicator lamp OFF NO Operating mode (HEAT) Indoor side NO w 4 w 6 Fan STOP Operating mode (FAN) NO Auxiliary heater OFF YES COOL operation YES DRY operation YES HEAT operation YES w 7 FAN operation Auto COOL/HEAT operation Outdoor side w 5 Compressor OFF Fan STOP Four-way valve OFF w1 In addition, the centralised control and remote control can be operated. w2 The modes which indicate the sources of trouble are listed below. ● E0-Signal transmitting/receiving error ● P1-Room temperature thermistor malfunction ● P2-Indoor coil thermistor malfunction ● P4-Drain sensor malfunction ● P5-Drain overflow ● P6-Coil frost/overheat protection ● P7-System error ● P8-Outdoor unit trouble w3 The CHECK switch will show if an error has occurred in the past. w4 Fan runs on low speed for 1 minute in order to remove overheat air. w5 The 3-minute (6 minutes … heating mode) time-delay functions after compressor stops. w6 FAN or AUTO mode is selected by the indoor dip switch setting. w7 In FAN mode, fan speed and vane operation depend on the remote controller setting. (Compressor is OFF.) 20 OC276-A-1.qxp 03.11.25 9:04 AM Page 21 COOLING OPERATION COOL operation Four-way valve/OFF NO w8 Initial COOLING YES Vane initial setting Vane 55 deg downward angle 70 deg downward angle NO YES Fan speed LOW NO YES NO Vane setting notch Downward discharge 1 hour YES Vane horizontal airflow w9 YES Compressor thermostat ON NO Allowance cancel NO YES 3-minute time delay YES NO 6-minute time delay NO 3-minute compressor operation Allowance period NO 6 minute time delay NO w 10 YES NO Cooling area YES 10-minute compressor operation NO Indoor coil temperature is 50˚F or higher YES YES Allowance cancel Coil frost prevention NO NO Defrosting protection detection temperature 30˚F or lower YES YES 16-minute compressor operation YES Indoor pipe temperature is 34˚F or lower NO Compressor ON Coil frost protection Allowance set YES Coil frost protection NO w 11 NO YES NO NO 1 min continue YES FAN speed LOW FAN speed LOW 5 min elapse YES NO 6-minute time delay 3-minute time delay Outdoor unit trouble YES Coil frost prevention Coil frost prevention release Compressor OFF 1 w8 When operation stops or changes to cooling or dry mode, the auto vane turns to a horizontal angle. If operation changes during auto vane SWING, the auto vane will continue to swing. w9 When operating TEST RUN, the thermostat will be continuously ON. w10 After 3 minute compressor operation, if the indoor coil thermistor reads 5°F or below for 3 minutes, the compressor will stop for 6 minutes. w11Heating area : Indoor coil temperature is more than 9 degrees above the room temperature. Cooling area : Indoor coil temperature is more than 9 degrees below the room temperature. FAN area : Indoor coil temperature is within 9 degrees either way of the room temperature. 21 OC276-A-1.qxp 03.11.25 9:04 AM Page 22 DRY OPERATION DRY operation Four-way valve / OFF NO Initial dry operation w8 YES Vane setting notch Vane initial setting YES w12 Room temperature is 64°F or lower NO NO During compressor ON YES 3-minute compressor operation NO NO YES NO YES 3-minute time delay w9 Compressor & thermostat ON YES Compressor & thermostat ON w9 NO YES NO Compressor ON time completes 10-minute compressor OFF NO YES YES w13 10-minute compressor OFF timer start Compressor ON time set Compressor OFF Compressor ON w14 w14 Fan STOP Fan speed LOW 1 w8—9 Refer to page OC276-21. w12 When room temperature is 64°F or below, the compressor cannot operate. When room temperature rises over 64°F the compressor starts after a 3-minute time delay. w13 Compressor ON time is decided by room temperature. Refer to page OC276-30. w14 In dry operation, compressor ON makes the fan speed LOW. Also, when the compressor OFF and the pipe temperature is 79°F or less, the fan stops, or when the compressor OFF and the pipe temperature is below 43°F the fan speed changes to LOW mode. It is not possible to set the fan speed with the remote controller 22 OC276-A-1.qxp 03.11.25 9:04 AM Page 23 HEATING OPERATION Heat operation NO Vane setting notch initial HEATING YES Vane initial setting NO A w 11 YES Heating area w 15 NO Defrost NO 30 min. elapse NO Four-way valve ON Defrost release 2 YES Outdoor unit trouble YES defrosting 3-minute NO Auxiliary heater OFF YES Indoor coil NO thermistor is 140°F or higher YES FAN speed NO Low notch YES FAN setting Airflow 10% up notch 1 Hot adjust YES in process NO YES Compressor ON w9 B NO Compressor YES thermostat ON NO Allowance cancel YES 3 min.restart prevention NO NO YES 6 min. restart prevention NO Indoor piping 5°F or lower YES 2 Outdoor unit trouble FAN SPEED Very low airflow Compressor OFF NO 10-minute compressor operation YES Allowance cancel B HOT adjust NO 5 min. elapse YES Indoor piping YES 131°F or lower NO w 11 Heating YES area NO FAN STOP YES Indoor piping 95°F or higher NO NO Auxiliary heater ON YES NO Indoor piping 140°F or higher A NO Auxiliary heater thermostat ON YES Auxiliary heater ON w 11 YES Fan area YES 20 min.elaspe Auxiliary heater OFF NO YES w 10 Overheat remote Hot adjust start Fan area Outdoor unit START Heating area trouble NO FAN SPEED w 11 very low NO Fan area NO Indoor Coil. temp. Cooling area 150°F or higher Compressor ON YES YES Defrost operation START Allowance NO period Four-way valve 6-minute restart YES OFF prevention Overload protect Allowance set 1 AUTOMATIC COOLING/HEATING OPERATION Compressor OFF Auto COOL/HEAT operation w 16 NO Initial mode w 17 1 YES T1 > = To NO YES COOL mode COOL mode HEAT mode NO YES NO NO T1 [ (To - 4) YES After 15min. YES T1 ] (To + 4) YES After 15min. YES T1 [ (To-4) NO NO COOL operation T1 ] (To + 4) HEAT operation HEAT operation Cool mode set 1 1 w15 ( i ) Until Low airflow is set while in hot adjustment ( ii )While defrosting (FAN STOP) (iii)When thermostat is OFF In the case of( i ), (ii) and (iii) above, airflow is horizontal regardless the VANE setting. w16 When AUTO operation is started, COOL or HEAT mode is selected automatically. w17 T1 : Room temperature. To : Set temperature 23 FAN SPEED Low FAN SPEED NO Low 2 min. elapse YES FAN SPEED setting notch Hot adjust release OC276-A-1.qxp 9 03.11.25 9:04 AM Page 24 MICROPROCESSOR CONTROL 1.OUTLINE OF MICROPROCESSOR CONTROL INPUT to remote controller ● OFF-ON switching. ● COOL/DRY-AUTO-HEAT selector switching. ● Thermostat setting. ● TIMER mode selector-switching and Timer setting. ● HIGH-LOW fan speed switching. ● AUTO Vane selector (AIR DISCHARGE) switching. ● TEST RUN switching. ● CHECK mode switching. (Self diagnostic trouble shooting) Remote controller board ● Processes and transmits orders. OUTPUT to remote controller ● Indication LCD lights. COOL DRY AUTO FAN HEAT CHECK TEST MODEL RUN SELECT FAN ˚F ˚C STOP AMPM SWING START AMPM NOT AVAILABLE ON/OFF TEMP Indoor unit Indoor controller board INPUT from indoor unit ● Room temperature thermistor (RT1) ● Pipe temperature thermistor (RT2) OUTPUT to indoor unit ● Receives orders from remote controller and temperature data from indoor unit. ● Processes orders and data. ● Controls indoor and outdoor operation. ● Self diagnostic function. w System control operation. w Emergency operation. w Set by dip switch on indoor controller board. Polar three-wire cable ● Compressor protection device working ● Defrosting START-STOP ● Fan speed control. ● Crankcase heater control ON-OFF. ● Self diagnostic function Outdoor unit 12VDC Independent Control of Outdoor Unit 1 2 3 24 OUTPUT to outdoor unit 1 2 3 ● Auto vane’s angle setting. ● Booster heater ON-OFF Control. ● Emergency stop. ● Compressor and outdoor fan : ONOFF ● Operation mode change :COOLHEAT. OC276-A-1.qxp 03.11.25 9:05 AM Page 25 2. INDOOR UNIT CONTROL 2-1 COOL operation COOL <How to operate> 1 Press POWER ON/OFF button. 2 Press the MODE button to display COOL. 3 Press the TEMP( or ) button to set the desired temperature. NOTE: Set temperature changes 2°F when the TEMP( or ) button is pressed one time. Cooling 65 to 87°F. ˚F FAN AM ON/OFF MODE TEMP FAN AUTO STOP VANE AUTO START CHECK LOUVER h TEST RUN SET min RESET CLOCK <COOL operation time chart> Operation starts by POWER button ON. Room temperature becomes equal to set temperature. Room temperature rises above set temperature. Operation stops by POWER button OFF. ON Thermostat OFF ON Indoor fan LOW or HIGH LOW or HIGH OFF ON Auto vane OFF Booster heater OFF ON OFF ON Compressor OFF Minimum 3 minutes w1 w1 Even if the room temperature rise above the set temperature during this period, the compressor will not start until this period has ended. 25 OC276-A-1.qxp 03.11.25 9:05 AM Page 26 (1) Compressor control 1 3-minute time delay To prevent overload, the compressor will not start within 3 minutes after stop. 2 The compressor runs when room temperature is higher than set temperature. The compressor stops when room temperature is equal to or lower than the set temperature. The compressor maintains the previous state when the room temperature minus the set temperature is 0 degrees or more, or lower than 2 degrees. 3 The compressor stops in check mode or during protective functions. 4 Coil frost prevention To prevent indoor coil frost, the compressor will stop when the indoor coil thermistor (RT2) reads 34°F or below after the compressor has been continuously operated for at least 16 minutes or more. When the indoor coil temperature rises to 50°F or above, the compressor will start in a 3-minute(w2) time delay. w2 When the indoor coil temperature is 30°F or less, the compressor starts in 6 minutes. NOTE : By turning OFF the dip switch SW1-3 on indoor controller board, the start temperature of coil frost prevention changes from 34°F to 36°F. 5 Coil frost protection When indoor coil temperature becomes 5°F or below,coil frost protection will proceed as follows. <Start condition> After the compressor has been continuously operated for 3 minutes or more,and the indoor coil temperature has been 5°F or below for 3 minutes,the coil frost protection will start. <Coil frost protection> Compressor stops for 6 minutes,and then restarts. lf the start condition is satisfied again during the first 10 minutes of compressor operation,both the indoor and outdoor units stop,displaying a check code of“P6”on the remote controller. <Termination conditions> Coil frost protection is released when the start condition is not satisfied again during the allowance, or when the COOL mode stops or changes to another mode. (2) Indoor fan control Indoor fan speed depends on the remote controller setting. However, if an outdoor unit abnormality is detected, the indoor fan speed will be low, regardless of the remote controller setting. When the outdoor unit abnormality detection is released and the fan speed returns to the set speed, the quiet cycle control will work. (a) Normal control ( i ) Fan speed depends on the remote controller setting regardless of the thermostat on/off. (ii) Fan speed will remain on low if an abnormality in outdoor unit is detected. (5 minutes) 5 minutes SET 5 minutes 1 Start-up of outdoor unit abnormality detection. 2 Release of outdoor unit abnormality detection. 3 Unit stop due to outdoor unit abnormality with P8 indication. SET low low OFF NOTE 1 : Fan stops immediately if the unit stops or the check mode is started. 26 OC276-A-1.qxp 03.11.25 9:05 AM Page 27 (3) Auto vane control Auto vane position is set to 10 degrees airflow at the start-up of COOL operation. It can then be changed by the remote controller. (a) Vane position set mode & swing mode. ( i ) Every time AIR DISCHARGE button is pressed, setting will be changed . ( ii ) Airflow direction can be changed with AIR DISCHARGE button. 1 Fan speed : LOW 10° 60° 70° SWING 60° 70° SWING 2 Fan speed : HIGH 10° 30° <AUTO RETURN> When discharge 60° or 70° continues for 1 hour with the fan speed at LOW, the discharge direction turns to the horizontal discharge automatically. After that, 60° or 70° is available by setting with the remote controller, and it continues for 1 hour. If the discharge direction changes from 60° or 70°, the direction returns to the horizontal discharge when 1 hour has passed since the discharge 60° started. If the discharge direction changes from 60° (or 70°) to the horizontal discharge, the 1-hour timer to return the horizontal discharge is cancelled. <Remote controller display> 1 10° 2 30° downward 3 60° downward 4 70° downward 5 SWING Changes by pressing the AIR DISCHARGE button. 27 OC276-A-1.qxp 03.11.25 9:05 AM Page 28 (4) Detecting abnormalities in the outdoor unit After the compressor has been continuously operated for 3 minutes, if the difference between the indoor coil temperature and room temperature is out of RANGE C for 1 minute, the indoor fan speed will turn to LOW. Five minutes later, if the difference is still out of RANGE C,the outdoor unit is functioning abnormally. Thus, the compressor stops and check code “P8” appears on remote controller. RANGE A : Indoor coil temperature is more than 9 degrees above room temperature. RANGE B : Indoor coil temperature is within 9 degrees either way of room temperature. RANGE C : Indoor coil temperature is more than 9 degrees below room temperature. Indoor coil temperature minus room temperature (degree) +9 0 -9 RANGE A RANGE B RANGE C 28 OC276-A-1.qxp 03.11.25 9:05 AM Page 29 2-2 DRY operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the MODE button to display “DRY” 3 Press the TEMP( or ) button to set the desired temperature. NOTE: The set temperature changes 2°F when the TEMP( or ) button is pressed one time. Dry 65 to 87°F ˚F DRY FAN AM ON/OFF MODE TEMP FAN AUTO STOP VANE AUTO START CHECK LOUVER TEST RUN SET h min RESET CLOCK <DRY operation time chart> Operation starts by POWER button ON. Room temperature becomes equal to set temperature. Room temperature rises above set temperature. Operation stops by POWER button OFF. ON Thermostat OFF DRY MODE DRY MODE ON Indoor fan OFF Auto vane OFF ON ON Booster heater OFF OFF ON Compressor OFF Minimum 3 minutes w1 w1 Even if the room temperature rises above the set temperature during this period, the compressor will not start until this period has ended. 29 OC276-A-1.qxp 03.11.25 9:05 AM Page 30 1) Compressor control 1 3-minute time delay To prevent overload, the compressor will not start within 3 minutes after stop. 2 The compressor runs when room temperature is higher than set temperature. The compressor stops when room temperature is equal to or lower than the set temperature. The compressor maintains the previous state when the room temperature minus the set temperature is 0°F or more, or lower than 2°F. 3 The compressor stops in check mode or during protective functions. 4 The compressor will not start when the room temperature is 64°F or below. The compressor starts intermittent operation when the power is turned ON with room temperature above 64°F. The compressor ON/OFF time depends on the thermostat ON/OFF and the following room temperatures.After 3-minute compressor operation, ● If the room temperature thermistor reads above 82°F with thermostat ON, the compressor will operate for 6 more minutes and then stop for 3 minutes. ● If the room temperature thermistor reads 79°F to 82°F with thermostat ON, the compressor will operate for 4 more minutes and then stop for 3 minutes. ● If the room temperature thermistor reads 75°F to 79°F with thermostat ON, the compressor will operate for 2 more minutes and then stop for 3 minutes. ● If the room temperature thermistor reads below 75°F with thermostat ON, the compressor will stop for 3 minutes. ● If the thermostat is OFF regardless of room temperature, the compressor will stop for 10 minutes. 5Coil frost protection Coil frost protection in DRY operation is the same as in COOL operation. 6Coil frost prevention Coil frost prevention does not operate in DRY operation. (2) Indoor fan control The indoor fan runs on LOW speed during compressor operation. The fan speed cannot be changed with the remote controller. Also, the fan runs on LOW speed when the pipe temperature is 43°F or more, or the compressor is OFF and the pipe temperature is below 43°F. (a)During compressor OFF ● When the indoor coil temperature is 43°F or above, the indoor fan will stop. ● When the indoor coil temperature is below 43°F, the indoor fan will run on LOW speed. (b)During compressor ON ● The indoor fan runs on LOW speed. <Dry mode> The fan notch is controlled by the indoor coil temperature every 30 seconds. Fan control in DRY operation. Pipe temp. Fan 43°F or more STOP Below 43°F LOW All LOW Compressor OFF Compressor ON (3) Auto vane control Same as in COOL operation (4) Detecting abnormalities in the outdoor unit An abnormality in the outdoor unit can not be detected in DRY operation. 30 OC276-A-2.qxp 03.11.25 9:06 AM Page 31 2-3 HEAT operation FAN AUTO STOP <How to operate> 1 Press POWER ON/OFF button. 2 Press the MODE button to display “HEAT” 3 Press the TEMP( or ) button to set the desired temperature. NOTE: The set temperature changes 2°F when the TEMP( or ). button is pressed one time. Heating 63 to 83°F. <Display in HEAT operation> VANE AUTO START [DEFROST] ˚F FAN AM HEAT ON/OFF MODE TEMP CHECK LOUVER TEST RUN SET The [DEFROST] symbol is only displayed during the defrost operation. h [STANDBY] min RESET The [STANDBY] symbol is only displayed from the time the heating operation starts until the heated air begins to blow. CLOCK <HEAT operation time chart> Operation starts by POWER button ON. Thermostat Room temperature becomes equal to set temperature. OFF LOW w1 LOW w1 Booster heater Compressor LOW or HIGH LOW or HIGH w1 Changeable LOW or HIGH by indoor dip switch SW1- 6 . OFF ON Auto vane Operation stops by POWER button OFF. ON ON Indoor fan Room temperature falls below set temperature. Horizontal Depends on remote controller setting Horizontal Depends on remote controller setting OFF ON OFF Hot adjustment Hot adjustment OFF during thermostat OFF hot adjustment defrosting ON OFF Minimum 3 minutes w2 Power ON lamp STAND BY lamp ON OFF ON From POWER ON until warm begins to blow OFF w2 Even if the room temperature falls below the set temperature during this period, the compressor will not start until this period has ended. 31 OC276-A-2.qxp 03.11.25 9:06 AM Page 32 (1) Compressor control 13-minute time delay To prevent overload, the compressor will not start within 3 minutes after stop. 2The compressor runs when the room temperature is lower than the set temperature. The compressor stops when the room temperature is equal to or higher than the set temperature. 3The compressor stops in check mode or during protective functions. 4Overheat protection <Start condition> When the indoor coil thermistor reads 158°F or above, the overheat protection will start. <Overheat protection> The compressor stops for 6 minutes, and then restarts. If the start condition is satisfied again within 10 minutes of compressor operation, both the indoor and outdoor units stop, displaying a check code of “P6” on the remote controller. <Termination conditions> Overheat protection is terminated when the start condition is not satisfied again during the allowance (10-minute compressor operation), when operation mode changes to other mode, or when thermostat turns OFF. (2) Indoor fan control (a) Normal control ( i )The indoor fan runs on LOW speed during the thermostat OFF. LOW speed can be changed to HIGH speed by setting the dip switch SW1-6. If the indoor coil temperature becomes more than 5 degrees below the room temperature during the thermostat OFF, the indoor fan will stop. After, when the indoor coil temperature becomes within 5 degrees of room temperature, the indoor fan will run on LOW speed. ( ii )Hot adjustment Hot adjustment is a warm-up for HEAT operation <Start conditions> The hot adjustment works under any of the following conditions. ● HEAT operation starts. ● Defrosting ends. ● Thermostat turns ON. [Hot adjustment] Initially, the indoor fan runs on LOW speed. When 5 minutes have passed or the indoor coil temperature exceeds 95°F, the fan speed will not be changed. 2 minutes later, the hot adjustment ends. Then, the fan speed depends on the remote controller setting. (iii)The indoor fan stops when the indoor coil temperature is within 9 degrees either way of room temperature. (iv)To eliminate the remaining heat, the indoor fan runs for the first 1 minute after the booster heater is turned OFF. (3) Auto vane control Auto vane position is set to 70 degrees airflow at the start-up of HEAT operation. (a) Vane position set mode & swing mode. ( i ) Every time AIR DISCHARGE button is pressed, setting will be changed . ( ii ) Airflow direction can be changed with AIR DISCHARGE button. 10° 30° 60° 70° SWING NOTE : In the following cases, the discharge direction is 30° regardless of the remote controller setting. 1 During the hot adjustment with fan speed at LOW 2 During defrosting with indoor fan OFF 3 During thermostat OFF (4) Booster heater control When the room temperature is 6 degrees below the set temperature, the booster heater will turn ON. When the room temperature is equal to the set temperature, booster heater will turn OFF. During the hot adjustment, the booster heater will not work. <Overheat prevention> When the indoor coil thermistor rises to 140°F or above, the booster heater cannot work. When the indoor coil thermistor falls to 131°F or below, the booster heater can work. 32 OC276-A-2.qxp 03.11.25 9:06 AM Page 33 (5) Detecting abnormalities in the outdoor unit When the outdoor unit is determined to be abnormal by the following causes, the compressor will stop and the check code “ P8 ” will appear on the remote controller display. ( i ) During compressor ON while hot adjustment is set. 1 If the difference between the indoor coil temperature and room temperature is in the RANGE B, the indoor fan will stop. 2 Within 20 minutes after entering RANGE B (except for the first 10 seconds), a) If the temperature difference enters RANGE A, the hot adjustment starts, b) If the temperature difference is still in RANGE B, the outdoor unit is deemed abnormal. c) If the temperature difference enters RANGE C, defrosting starts. 3 Within 20 minutes after entering RANGE C, if the temperature difference does not return to RANGE B,the outdoor unit is deemed abnormal. 4 If the temperature difference returns to RANGE B, the next 20 minutes is an allowance period. If the difference enter RANGE A during the allowance, defrosting ends and the hot adjustment starts. If the difference does not enter RANGE A during the allowance, the outdoor unit is deemed abnormal. ( ii ) During compressor ON in defrosting After 30 minutes of defrosting in hot adjustment, if the temperature difference is still in RANGE C, the outdoor unit is determined to be abnormal. When RANGE B does not change to RANGE A after 20 minutes have passed since RANGE C had outdoor unit is determined to be abnormal. ( iii ) During compressor OFF Not detecting abnormalities. (6) Indoor coil temperature abnormality detection An abnormality can be detected during compressor ON, except for the following. ●For the first 30 minutes after the temperature difference between the indoor coil temperature and room temperature enters the RANGE C. ●When the temperature difference enters the RANGE C until it moves to the RANGE B. (7) Defrosting operation After the outdoor unit starts the defrosting operation, when the temperature difference between the indoor coil temperature and room temperature gets out of RANGE A and into RANGE B, the indoor unit starts the defrosting mode. After the outdoor unit stops the defrosting operation, when the temperature difference returns to the RANGE A, the indoor unit stops the defrosting mode. While the indoor unit is in the defrosting mode, the indoor fan and the booster heater stop. w1 RANGE A : Indoor coil temperature is more than 9 degrees above room temperature. RANGE B : Indoor coil temperature is within 9 degrees either way of room temperature. RANGE C : Indoor coil temperature is more than 9 degrees below room temperature Indoor coil temperature minus room temperature (degree) +9 RANGE A 0 RANGE B -9 RANGE C 33 OC276-A-2.qxp 03.11.25 9:06 AM Page 34 2-4 AUTO operation (Automatic COOL/HEAT change over operation) <How to operate> 1 Press POWER ON/OFF button. 2 Press the MODE button to display “AUTO” 3 Press the TEMP( or ) button to set the desired temperature. NOTE: The set temperature changes 2°F when the TEMP( or ) button is pressed one time. Automatic 65 to 83°F. ●“AUTOMATIC” works to change by itself the operation mode either to cooling or heating according to the room temperature. ˚F AUTO FAN AM ON/OFF TEMP MODE FAN AUTO STOP VANE AUTO START CHECK LOUVER h TEST RUN SET min RESET CLOCK (1) Initial mode 1 When AUTO operation starts after unit OFF. ● If the room temperature is higher than the set temperature, operation starts in COOL mode. ● If the room temperature is equal to or lower than the set temperature, operation starts HEAT mode. 2 When AUTO operation starts after COOL or HEAT operation, the previous mode continues. (2 ) Mode change 1 HEAT mode changes to COOL mode when 15 minutes have passed since the room temperature became 4 degrees above the set temperature. 2 COOL mode changes to HEAT mode when 15 minutes have passed since the room temperature became 4 degrees below the set temperature. To:Set temperature (65~83°F) (degree) When room temperature becomes 4 degrees above the set temperature,the operation mode can not be changed for 15 minutes. Mode change (HEAT COOL) To + 4 To + 2 To To - 2 To - 4 15 minutes COOL mode HEAT mode Compressor Mode change (COOL HEAT) 15 minutes Start HEAT mode ON OFF Minimum 3 minutes (3) Temperature range AUTO operation is available under the outside air temperatures as follows. 10 0 0°F 20 30 40 50 70 80 COOLING * 17°F * 60 HEATING 34 100 110 120 (°F) 115°F 75°F In case of the wind baffle installed. 90 OC276-A-2.qxp 03.11.25 9:06 AM Page 35 2-5 Auto vane control <How to operate> To change the air flow direction, press VANE ( ˚F AUTO FAN ) button. SWING AM ON/OFF MODE TEMP FAN AUTO STOP VANE AUTO START CHECK LOUVER TEST RUN SET h 1 2 3 4 5 10˚ 30˚ 60˚ 70˚ SWING min RESET CLOCK <Remote controller display> 1 10° 2 30° downward Available in COOL operation with fan speed on HIGH or in HEAT operation. Unavailable in DRY operation. If fan speed changes from LOW to HIGH during 30° downward discharge in COOL mode, the direction automatically changes to 10°. 3 60° downward 4 70° downward 5 SWING Changes by pressing the AIR DISCHARGE button. (1) COOL/DRY operation At the start-up of COOL or DRY operation, the discharge direction in automatically set to 10°. After, it can be changed to another direction with VANE ( ) button on the remote controller. <Auto return> When discharge 60° or 70° continues for 1 hour with the fan speed at LOW, the discharge direction turns to the horizontal discharge automatically. After that, 60° or 70° is available by setting with the remote controller, and it continues for 1 hour. If the discharge direction changes from 60° or 70°, the direction returns to the horizontal discharge when 1 hour has passed since the discharge 60° started. If the discharge direction changes from 60° (or 70°) to the horizontal discharge, the 1-hour timer to return the horizontal discharge is cancelled. (2) HEAT operation At the start-up of HEAT operation, discharge direction depends on the setting of the last operation. After, it can be changed to another direction with VANE ( ) button. The discharge direction shifts to 10° regardless of the remote controller settings under any of the following conditions. ● Thermostat OFF ● Defrosting ● Indoor fan speed LOW in hot adjustment 35 OC276-A-2.qxp 03.11.25 9:06 AM Page 36 2-6 TIMER operation <Timer function> COOL AUTO STOP ·········The air conditioner stops after the set time lapses. ˚F STOP FAN PM AUTO START ········The air conditioner starts after the set time lapses. SWING START AM ON/OFF MODE FAN AUTO STOP VANE AUTO START CHECK LOUVER TEST RUN SET AUTO OFF ············Timer is not active. TEMP <How to operate> 1 Push POWER ON/OFF button. 2 Check if or not the current time is correct. 3 Push the or button and select the desired time. 4 Set the timer time using HR and MIN buttons. h min RESET CLOCK 2-7 Test run Test run Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500V Megger and check that it is A TEST RUN COOL FAN ON/OFF TEMP 6 MODE 3 FAN AUTO STOP VANE AUTO START CHECK LOUVER TEST RUN min 2 SET h RESET CLOCK 4 5 equal to or greater than 1.0M". 1 Turn on the main power to the unit. TEST RUN 2 Press the button twice continuously. (Start this operation from the status of remote controller display turned off.) TEST RUN A and current operation mode are displayed. MODE 3 Press the ( ) button to activate COOL mode, then check whether cool air is blown out from the unit. FAN 4 Press the button and check whether strong air is blown out from the unit. VANE 5 Press the button and check whether the auto vane operates properly. 6 Press the ON/OFF button to stop the test run. Note: • Point the remote controller towards the indoor unit receiver while following steps 2 to 6. • It is not possible to run the in FAN, DRY or AUTO mode. 36 OC276-A-2.qxp 03.11.25 9:06 AM Page 37 (1) Indoor coil temperature code During the test run, the indoor coil temperature code from 1 to 15 is displayed on the remote controller instead of room temperature. The code should fall with the lapse of time in normal COOL operation, and should rise in normal HEAT operation. Code 1 Indoor coil temperature ~34(36)°F 2 3 4 5 6 7 8 36(37)°F~50°F ~59°F ~68°F ~77°F ~86°F ~95°F ~104°F Code 9 10 11 12 13 14 15 Indoor coil temperature ~113°F ~122°F ~131°F ~140°F ~158°F ~191°F Thermistor abnormality (2) Trouble during test run ● If the unit malfunctions during the test run, refer to section 10 in this manual entitled “TROUBLESHOOTING.” ● When the optional program timer is connected to the conditioner, refer to its operating instructions. 2-8 Emergency operation When the remote controller or microprocessor malfunctions but all other parts are normal, emergency operation is started by setting the dip switch SW3 on the indoor controller board. <Before emergency operation> 1. Make sure the compressor and the indoor fan are operating normally. 2. Locate the defect with the self-diagnostic function. When the self-diagnostic function indicates “protective function is working”, release the protective function before starting the emergency operation. CAUTION: When the self-diagnostic function indicates a check code of “P5” (drain pump malfunction), do not start the emergency operation because the drain may overflow. <How to operate> 1. For emergency cooling, set the dip switch SW3-1 to ON and SW3-2 to OFF. For emergency heating, set the dip switch SW3-1,2 to ON. Emergency cooling 1 1 ON 2 Emergency heating 1 2 1.2 ON Normal operation 1 SW3 2 1.2 OFF Indoor controller board 2. Turn ON the outdoor unit breaker and then ON the indoor unit breaker. Emergency operation will now start. 3. During emergency operation, the indoor fan operates on high speed, the auto vanes do not operate. 4. To stop emergency operation, turn OFF the indoor unit breaker. 5. Movements of the vanes do not work in emergency operation, therefore you have to slowly set them manually to the appropriate position. NOTE: The remote controller POWER ON/OFF button can not start/stop emergency operations. CAUTION: Do not use emergency cooling for more than 10 hours, as the indoor coil may freeze. 37 OC276-A-2.qxp 03.11.25 9:06 AM Page 38 2-9 Dip switch and jumper connector functions. Each figure shows the initial factory setting. 2-9-1 On remote controller board (1). On indoor controller board 1. SW1 (Mode selector) 1 2 3 4 5 6 7 8 9 10 ON OFF SW1-1) Switch that changes between FAN mode and AUTO mode OFF:AUTO mode for models with heat pump ON:Fan mode for models without heat pump SW1-2) Switch for drain pump OFF:The drain pump works in COOL and DRY operation. ON:The drain pump works in both COOL and DRY and HEAT operation. SW1-3) Switch to change the temperature to start coil frost prevention OFF:34°F ON:36°F SW1-4) Switch for set temperature adjustment in HEAT mode During HEAT operation,warm air collects near the ceiling.When the indoor unit is installed near the ceiling,the temperature read by room temperature thermistor differs from the actual living-space temperature by about 7 degrees. Therefore,the room temperature read by room temperature thermistor must be lowered by 7 degrees. OFF:7-degree adjustment ON:NO adjustment SW1-5) Not for use. SW1-6) Switch for fan speed during thermostat OFF in HEAT operation OFF:LOW ON:LOW or HIGH(set with remote controller) SW1-7) Switch for detecting abnormalities in the outdoor unit abnormality detection OFF:When an abnormality occurs,it is detected. ON:Even if an abnormality occurs,it can not be detected. SW1-8) Switch for auto restart function OFF:This function does not work ON:This function works. SW1-9, 10) Not for use. 2. SW2 (Address selector) 1 2 3 4 5 6 ON OFF SW2-1~6) Not for use. 3. SW3 (Emergency operation switch) Normal operation For emergency cooling 1 2 ON OFF For emergency heating 1 2 ON OFF 1 2 ON OFF 4. SW5 (Model selector) 1 2 3 4 ON OFF SW5-1) Not for use. SW5-2) Leave this switch as it is. SW5-3) Not for use. SW5-4) Not for use. 38 OC276-A-2.qxp 03.11.25 9:06 AM Page 39 5. SW6 (Address selector) 1 2 3 4 ON OFF This switch is not available for series PKH. 6. SW7 (Model selector) Switch to set the output of phase-controlled indoor fan motor. Address setting is available at any time. The initial factory setting by is based on each capacity. Service Ref. SW7 PKH18FL ON OFF PKH24FL ON OFF 1 2 3 PKH30FL ON OFF ON OFF 1 2 3 PKH36FL 1 2 3 7. SW8 (Option) 1 2 3 4 5 6 ON OFF SW8-1~2) Not for use. SW8-3~4) Not for use. SW8-5) Not for use. SW8-6) OFF:For 230V power supply ON: For 208V power supply 8. SW9 (Model selector) 1 2 3 4 5 ON OFF SW9-1~5) Keep this switch. 2-10 INDOOR FAN CONTROL Indoor fan relay output. (a) During fan ON The indoor fan relay turns ON. One second later, the phase control will start. (b) During fan OFF The phase control turns OFF. One second later, the indoor fan relay will turn OFF. 39 1 2 3 OC276-A-2.qxp 03.11.25 9:06 AM Page 40 2-11 Wireless remote controller pair number setting operation A MODEL SELECT Model No. TEMP ON/OFF 4 MODE 1 Turn on the main power to the unit. 2 Press the SET button with the point of a ball-point pen or the like. Start this operation from the status of remote controller display turned off. MODEL SELECT blinks and Model No. is lighted. min 3 Press the button twice continuously. A Pair No. “0” blinks. 4 Press the temp button to set the pair number you want to set. 5 Press the SET button with the point of a ball-point pen or the like. Set pair number is lighted for three seconds then turned off. FAN AUTO STOP VANE AUTO START CHECK LOUVER TEST RUN A Pair No. of wireless remote controller Indoor PC board 0 Factory setting 1 Cut J41 h 2 Cut J42 min 3~9 3 2,5 SET RESET CLOCK 40 Cut J41, J42 OC276-A-2.qxp 03.11.25 9:06 AM 10 Page 41 TROUBLESHOOTING 1. Self-diagnostic function A Self-check B 1 Turn on the main power to the unit. CHECK 2 Press the button twice continuously. (Start this operation from the status of remote controller display turned off.) A CHECK begins to light. B “00” begins to blink. 3 While pointing the remote controller toward the unit’s receiver, h press the button. The check code will be indicated by the number of times that the buzzer sounds from the receiver section and the number of blinks of the operation lamp. 4 Press the ON/OFF button to stop the self-check. TEMP ON/OFF 4 MODE FAN AUTO STOP VANE AUTO START CHECK LOUVER Check Code h 3 2 min TEST RUN SET RESET CLOCK 41 Alarm Buzzer sound 1 Suction sensor alarm Single beep O 1 2 Pipe sensor alarm Single beep O 2 3 Transmission alarm Single beep O 3 4 Drain sensor alarm Single beep O 4 5 Drain pump alarm Single beep O 5 6 Anti-freezing on Single beep O 6 Anti-overheat on Single beep O 6 7 System error Single beep O 7 8 Outdoor unit alarm Single beep O 8 9 No alarm (no error) Receiving signal only (no error alarm) OC276-A-2.qxp 03.11.25 9:06 AM Page 42 2. OTHER TROUBLES AND CAUSES Auto vanes do not work. Unit stops after 5 to 20 seconds operation Power ON/OFF button is not available. Auto vane motor is damaged. Auto vane motor does not work. Auto vane motor relay is damaged. Connector is poorly connected. Auto vane motor is poorly assembled. Indoor controller board is damaged. Protection function is working. Refer to check code on remote controller display. Indoor/outdoor connecting wire is connected incorrectly. Indoor/outdoor connecting wire shorts. Compressor protector is damaged. Defroster is broken. Remote controller is damaged. Transmission wire is poorly connected Check Diagnosis of malfunction Cause code Abnormality of room temper- 1) Bad contact of thermistor 1 ature thermistor (RT1) 2) Damaged thermistor Transmission wire is damaged. Connector is poorly connected. Check points 1) Check the thermistor. 2) Measure the resistance of the thermistor. Normal resistance should be as follows. 32°F····15kΩ 86°F·····4.3kΩ 50°F······9.6kΩ 104°F·····3.0kΩ 68°F······6.3kΩ If the resistance is normal, replace the indoor controller board. 2 Abnormality of indoor coil thermistor (RT2) 4 Abnormality of drain sensor 1) Bad contact of transmission wire 2) Damaged thermistor 1) Check the connector. 2) Measure the resistance of the thermistor (between ➃ - ➄of CN50). As for the normal resistance, refer to the case of 1. If the resistance is normal, replace the indoor controller board. 5 Malfunction of drain pump 1) Malfunction of drain pump 2) Damaged drain sensor 1) Check the drain pump. 2) ● Check the drain sensor. ● Check the drain sensor heater. Normal resistance should be 82Ω. (between 1 - 3of CN50). If the resistance is normal, replace the indoor controller board. 6 Coil frost protection is working. 1) Short cycle of air cycle 2) Dirty air filter 3) Damaged fan 4) Abnormal refrigerant 1) 2) 3) 4) Clear obstructions from the air cycle. Clean the air filter Check the fan. Check the refrigerant temperature. 8 Abnormality in outdoor unit 1) Wrong wiring of indoor/outdoor connecting wire 2) Reversed phase 3) Protection device is working 4) Damaged outdoor coil thermistor 1) 2) 3) 4) Check the indoor/outdoor connecting wire. Change the connection of electric wiring. Check the protection device. Measure the resistance of the outdoor coil thermistor. If the resistance is normal, replace the outdoor controller board. ❈ The number of check code shows times of Buzzer sound. 42 OC276-A-2.qxp 03.11.25 9:06 AM Page 43 3. WRONG WIRING ON SITE 3-1 Between remote controller and indoor unit If the wire is disconnected between the remote controller and the indoor unit, nothing is displayed on the remote controller when the POWER button is pressed. The beep sound will also not be heard. 3-2 Phenomenon due to wrong wiring between indoor and outdoor units Wrong wiring Mode Thermostat OFF Indoor Outdoor 1 1 2 2 3 3 Indoor ON OFF HEAT Outdoor 1 1 2 2 3 3 Indoor 1 2 2 3 3 Indoor 1 1 2 2 3 3 Indoor 1 2 2 3 3 OFF Outdoor unit stops. ON Operation stops. 9 minutes later, check code “P8” appears on remote controller display. OFF Operation stops. ON Operation stops. 27 minutes later, check code “P8” appears on remote controller display. OFF Outdoor unit stops. ON Operation stops. 9 minutes later, check code “P8” appears on remote controller display. OFF Operation stops. ON Operation stops. 27 minutes later, check code “P8” appears on remote controller display. OFF Outdoor unit stops. ON Operation stops. 9 minutes later, check code “P8” appears on remote controller display. OFF Operation stops. ON Operation stops, 27 minutes later, check code “P8” appears on remote controller display. OFF Outdoor unit stops. ON Operation stops. 9 minutes later, check code “P8” appears on remote controller display. OFF Operation stops. ON Operation stops. 27 minutes later, check code “P8” appears on remote controller display. OFF Operation stops. ON Operation stops. 9 minutes later, check code “P8” appears on remote controller display. OFF Operation stops. 4-way valve turns OFF. ON 27 minutes later, check code “P8” appears on remote controller display. COOL COOL COOL HEAT Outdoor 1 Disconnection between 1 and 1 or 2 and 2. COOL HEAT COOL HEAT Disconnection between 3 and 3. COOL 4-Way valve turns ON. 9 minutes later, check code “P8” appears on remote controller display. Cooling operation. Several minutes later, check code “P8” appears on remote controller display. Normal operation until first thermostat OFF. HEAT Outdoor Operation stops. ON HEAT Outdoor 1 COOL Phenomenon – Normal operation. OFF Operation stops. 4-way valve turns OFF. ON Operation stops. 27 minutes later, check code “P8” appears on remote controller display. HEAT 43 OC276-A-2.qxp 03.11.25 9:06 AM Page 44 4. HOW TO CHECK THE PARTS Parts name Check points Room temperature thermistor (RT1) Pipe temperature thermistor (RT2) Disconnect the connector, then measure the resistance using a tester. (Surrounding temperature 50°F to 86°F) Normal 4.3k' to 9.6k' Fan motor (MF) Abnormal Open or short Measure the resistance between the terminals using a tester. Relay connector 1 Red 5 Motor terminal or Relay connector 1 3 White Black 3 Red-White White-Black 5 Orange Red M Brown-Yellow Brown-Blue Red-Orange Red-Pink Blue Brown Pink Yellow 18,24FL 99.5'i10% 103.5'i10% Abnormal 30,36FL 62.6'i10% 74.0'i10% Open or short Measure the resistance between the terminals using a tester. (Surrounding temperature 68°F to 86°F) Vane motor (MV) Connector Normal PKH Opening and closing temperature of protector. Open: 266i41°F (Fan motor OFF) Close: 176i68°F (Fan motor ON) Protector 4 5 2 (Refer to the thermistor) 3 6 1 Normal Abnormal 186 to 214' Open or short <Thermistor Characteristic graph> < Thermistor for lower temperature > 50 Thermistor for lower temperature Room temperature thermistor(RT1) Pipe temperature thermistor(RT2) Resistance (K") 40 Thermistor R0=15k' ± 3% Fixed number of B=3480k' ± 2% Rt=15exp { 3480( 32°F 50°F 68°F 77°F 86°F 104°F 1 273+t 1 )} 273 15k' 9.6k' 6.3k' 5.4k' 4.3k' 3.0k' 30 20 10 0 44 -4 14 32 50 68 86 104 122 Temperature (°F) OC276-A-2.qxp 03.11.25 9:06 AM 11 Page 45 DISASSEMBLY PROCEDURE Indoor unit PKH24FL OPERATING PROCEDURE PHOTOS&ILLUSTRATION 1. Removing the lower side of the indoor unit from the installation plate (1) Remove the 2 screws. Hang the indoor unit hangers to the catches on the installation plate. Figure 1 Hanger of indoor unit Catch of installation plate Metal fixture Screws 2. Removing the right side panel (1) Remove the 2 screws of the right side panel:one on the bottom and the other on the upper right-hand side. (2) Disconnect the connector from the adapter case. (3) Sliding the right side panel to the right, pull it out toward you. Figure 2 Connector Indoor controller board Right side panel Terminal cover Connector Electrical box cover 3. Removing the indoor controller board (1) Remove the right side panel. (2) Remove the screw of the electrical box cover, and remove the cover. (3) Disconnect the connectors on the indoor controller board. (4) To unhook the catches on the right-hand side of the indoor controller board, pull the left-hand side toward you and lift up the cover to the right. Then the indoor controller board can be removed. 4. Removing the electrical box (1) Remove the right side panel. (2) Remove the screw of the electrical box cover, and remove the cover. (3) Remove the room temperature thermistor and the pipe temperature thermistor. (4) Disconnect the vane motor connector on the indoor controller board. (5) Remove the 2 screws of the electrical box. (6) Disconnect the connector of the heater lead wire connector. (7) Disconnect the connector of the fan motor lead wire. (8) Remove the electrical box. 45 Photo 1 Indoor controller board Electrical box cover Catches Room temperature thermistor Photo 2 Pipe temperature thermistor Screws Electrical box OC276-A-2.qxp 03.11.25 9:06 AM Page 46 OPERATING PROCEDURE PHOTOS&ILLUSTRATION (8) Remove the screws of the indoor controller board case, and pull out the indoor controller board case. Then the transformer and the capacitor and relay can be serviced. Relay Photo 3 Capacitor Power board Indoor controller board case 5. Removing the vane motor (1) Remove the right side panel. (2) Remove the screw of the electrical box cover, and remove the cover. (3) Remove the 2 screws of the vane motor, and remove the motor from the shaft. (4) Disconnect the vane motor connector on the indoor controller board. Photo 4 Electrical box Screws Vane motor Indoor controller board 6 Removing the intake grilles (1) Remove the right side panel. (2) To remove the left side panel, remove the screw on the bottom and the screw on the upper left-hand side. (See Figure 3.) 1. Press up this side of the left side panel to unhook the catch on the panel from the catch on the unit. 2. Slide the left side panel to the left to remove the panel. Note: Fix the unit to the metal fixture securely (3) Remove the air filters. (4) Hold and press the center cover to remove. (5) Remove the screws of the grilles. (6) Pull the lower side of the grille toward you and slide the upper to the right to remove the grilles. Figure 3 Catch on the left side panel Catch on the unit Photo 5 Left side panel Slide to the right Grilles Screws for grilles 7. Removing the drain pan (1) Remove the left and right side panels. (2) Remove the grilles. (3) Remove the electrical box cover. (4) Loosen the drain hose band to remove. (5) Remove the 3 screws of the drain pan, and slide the drain pan toward you to remove. Photo 6 Drain pan Drain hose band Screws Drain hose 46 OC276-A-2.qxp 03.11.25 9:06 AM Page 47 OPERATING PROCEDURE PHOTOS 8. Removing the line flow fan and the fan motor (1) Remove the left and right side panels. (2) Remove the grilles. (3) Remove the electrical box. (4) Remove the drain pan. (5) Loosen the screw that fixes the line flow fan to the fan motor. (See Photo 7. ) (6) Remove the 4 screws of the motor fixture, and remove the fan motor and the motor fixture at a time (See Photo 8.) (7) Remove the screws of the left and right motor supports, and remove the motor supports and the fan motor. (See Photo 9.) (8) Remove the 2 screws on the left and right sides of the heat exchanger, and pull the bearing support toward you. (See Photo 11.) (9) Remove the screw of the center support, and remove the support. (See Photo 10. ) (10) Pull the left-hand side of the heat exchanger toward you, and remove the line flow fan. Photo 7 Screw Line flow fan Fan motor Photo 8 Screws Fan motor Motor fixture Photo 11 Photo 9 Fan motor Screw Screw Heat exchanger Bearing support Motor support Motor support Photo 10 Line flow fan 9. Removing the electrical heater. (1) Remove the left and right side panels. (2) Remove the grilles. (3) Remove the drain pan. (4) Loosen the screw that fixes the line flow fan to the fan motor.(See Photo 7.) (5) Remove the screw of the center support, and remove the support. (See Photo 10.) (6) Remove the 2 screws on the left and right sides of the heat exchanger, and pull the bearing support toward you. (See Photo 11.) (7) Pull the left-hard side of the heat exchanger toward you, and remove the line flow fan. (8) Remove the heater fixing screws (1 screw each on right and left sides), and slide the heater element to the left to remove the heater. 47 Line flow fan Center support Screw Photo 12 Heat exchanger Heater element Heater fixing screw OC276-A-2.qxp 12 03.11.25 9:07 AM Page 48 PARTS LIST ELECTRICAL PARTS PKH18FL PKH24FL PKH30FL 1 PKH36FL 31 30 32·33 29 2 25 28 3 24 27 5 26 23 4 6 22 21 20 8 7 19 15 14 12 13 9 10 11 16 17 18 Q'ty / set Parts No. 1 R01 005 103 SLEEVE BEARING 1 2 R01 Z61 102 BEARING MOUNT 1 1 1 1 3 4 w 5 Parts Name R01 12G 114 LEFT LINE FLOW FAN R01 16G 114 LEFT LINE FLOW FAN R01 12G 115 RIGHT LINE FLOW FAN R01 16G 115 RIGHT LINE FLOW FAN T7W B08 480 HEAT EXCHANGER T7W B02 480 HEAT EXCHANGER T7W B09 480 HEAT EXCHANGER T7W B03 480 HEAT EXCHANGER Specifications PKH 24 30 FL FL 1 1 No. 18 FL 1 Including Restrictor valve • Capillary tube Including Restrictor valve • Capillary tube Including Restrictor valve • Capillary tube Including Restrictor valve • Capillary tube 36 FL 1 1 1 1 1 1 1 Wiring Remarks Diagram (Drawing No.) Symbol 1 1 1 1 1 w Restrictor valve and capillary tube have been added to "Specifications" of heat exchanger. 48 OC276-A-2.qxp No. 03.11.25 9:07 AM Page 49 Parts No. Parts Name Specifications 18 FL 1 T7W E13 529 DRAIN PAN T7W E14 529 DRAIN PAN 7 R01 12G 621 CENTER COVER 1 8 R01 12G 063 JOINT SHAFT R01 12G 002 AUTO VANE R01 16G 002 AUTO VANE 10 R01 KV5 527 DRAIN HOSE 1 11 6 9 Q'ty / set PKH 24 30 FL FL 1 36 FL Wiring Remarks Diagram (Drawing No.) Symbol 1 1 1 1 1 1 1 1 1 2 2 2 2 1 1 1 1 1 1 1 MV 1 1 1 1 RT1 RT2 R01 12G 223 VANE MOTOR 12 T7W E12 202 ROOM TEMPERATURE THERMISTOR ROOM TEMPERATURE 13 R01 E02 202 PIPE TEMPERATURE THERMISTOR PIPE TEMPERATURE (INDOOR COIL) 1 1 1 1 14 R01 377 246 TERMINAL BLOCK 3P(L1, L2, GR) 1 1 1 1 TB2 15 R01 998 246 TERMINAL BLOCK 3P(1, 2, 3) 1 1 1 1 TB4 16 T7W E03 255 FAN MOTOR CAPACITOR 2.5µF 440V 1 1 1 1 C 17 T7W E24 310 CONTROLLER BOARD 1 1 1 1 I.B 18 T7W 410 239 FUSE 2 2 2 2 F1.2<I.B> 19 R01 E02 313 POWER BOARD 1 1 1 1 P.B R01 479 215 RELAY LY1F DC12V 2 2 88H R01 673 215 RELAY LY2F DC12V R01 12G 105 RUBBER MOUNT R01 16G 105 RUBBER MOUNT T7W B00 762 FAN MOTOR PN4N45-K T7W B01 762 FAN MOTOR PN4N70-K 23 R01 E00 075 WIRELESS REMOTE CONTROLLER HOLDER 1 24 T7W E07 714 WIRELESS REMOTE CONTROLLER 25 R01 E01 049 26 27 20 21 22 250V 6A 1 1 2 2 88H 2 1 2 MF 1 1 1 1 1 1 1 1 1 1 REMOTE CONTROLLER DOOR 1 1 1 1 R01 12G 103 SLEEVE BEARING 1 1 1 1 R01 KV5 102 BEARING MOUNT 1 1 1 1 R01 12G 706 THERMAL FUSE 243°F 10A 250V 1 1 T7W 589 706 THERMAL FUSE 243°F 16A 250V 29 R01 20J 303 INSULATOR 1 30 T7W B00 700 THERMAL SWITCH T7W 587 300 HEATER ELEMENT 240V 700W T7W 589 300 HEATER ELEMENT 240V 800W 32 T7W B02 675 FAN GUARD 33 T7W B03 675 FAN GUARD 28 31 49 W.R FS1.2 1 1 1 1 1 1 1 1 1 3 3 2 MF FS1.2 26H H 3 3 2 2 2 H OC276-A-2.qxp 03.11.25 9:07 AM Page 50 STRUCTURAL PARTS PKH18FL PKH24FL PKH30FL 1 PKH36FL 10 9 2 3 8 8 7 6 4 5 Part number that is circled is not shown in the figure. No. Parts No. Parts Name Specifications R01 12G 662 LEFT SIDE PANEL 18 FL 1 R01 E01 812 UNDER PLATE 1 R01 E00 812 UNDER PLATE R01 E00 811 NOSE R01 E01 811 NOSE 4 R01 A17 500 5 1 2 Q'ty / set PKH 24 30 FL FL 1 1 36 FL 1 1 1 1 1 1 1 1 FILTER 4 4 5 5 R01 50J 317 W.A. CONT (A) 1 1 1 1 6 R01 24K 658 RECEIVER 1 1 1 1 7 T7W E00 661 RIGHT SIDE PANEL 1 1 1 1 8 R01 12G 691 INTAKE GRILLE 2 2 2 2 R01 12G 808 BACK PLATE 1 1 R01 16G 808 BACK PLATE 1 1 R01 E01 641 TOP PLATE R01 E00 641 TOP PLATE 1 1 1 1 1 1 3 9 10 11 R01 16G 692 INTAKE GRILLE 12 R01 12G 523 DRAIN SOCKET 1 1 50 1 1 Wiring Remarks Diagram (Drawing No.) Symbol OC276-A-2.qxp 03.11.25 9:07 AM Page 51 OC276-A-2.qxp 03.11.25 9:07 AM Page 52 TM cCopyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Nov. 2003 No.OC276 REVISED EDITON-A PDF 9 Distributed in Dec. 2001 No.OC276 . New publication, effective Nov. 2003 Specifications subject to change without notice. 3400 Lawrenceville Suwanee Road ● Suwanee, Georgia 30024 Toll Free: 800-433-4822 ● Toll Free Fax: 800-889-9904 www.mrslim.com Specifications are subject to change without notice.