OC245-C--1.qxp 02.12.19 9:58 AM Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OC245 REVISED EDITION-C TECHNICAL & SERVICE MANUAL Models PUH18EK PUH24EK PUH30EK PUH36EK PUH42EK PUH42EK7 PUH24EK1 PUH30EK1 PUH30EK2 PUH36EK1 PUH36EK2 PUH42EK1 PUH42EK71 CONTENTS 1. FEATURES ························································2 2. TECHNICAL CHANGE······································3 3. COMBINATION OF INDOOR AND OUTDOOR UNITS ··············4 4.
OC245-C--1.qxp 1 02.12.19 9:58 AM Page 2 FEATURES 1. REDI-CHARGED REFRIGERANT SYSTEM The industry’s first redi-charged refrigerant system. There is no need to adjust the amount of refrigerant to match the piping length on- site unless lines exceed 100ft. You will see a major reduction in installation time and labor costs. The unique refrigerant circuit and a large accumulator always control the refrigerant to its optimum condition unless the pipe length exceeds 100ft.
OC245-C--1.qxp 2 02.12.19 9:58 AM Page 3 TECHNICAL CHANGE (OC245 REVISED EDITION-A) Change of the service parts. Refer to 13.PARTS LIST for the details. [Change points] BYPASS VALVE and BYPASS VALVE SOLENOID COIL has been changed to externals. It has not been functionally changed. Therefore, the piping connected with the BYPASS VALVE has been changed.
OC245-C--1.qxp 02.12.19 9:58 AM 3 Page 4 COMBINATION OF INDOOR AND OUTDOOR UNITS Outdoor unit PUH Indoor unit Service manual No.
OC245-C--1.qxp 02.12.19 9:58 AM 5 Page 5 SPECIFICATIONS MODELS : PUH18EK PUH24EK PUH30EK PUH36EK PUH42EK PUH42EK7 PUH24EK1 PUH30EK1 PUH36EK1 PUH42EK1 PUH42EK71 PUH30EK2 PUH36EK2 Model Item PUH18EK PUH24EK PUH30EK PUH36EK 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 D in. Dimensions in.
OC245-C--1.qxp 6 02.12.19 9:58 AM Page 6 DATA 1. ADDITIONAL REFRIGERANT CHARGE (R22 : oz) Piping length (one way) 130 ft 145 ft 160 ft 164 ft Factory charged — — — 5 lbs 8 oz 4 6 8 9 9 lbs 15 oz 5 10 14 19 20 10 lbs 2 oz 0 5 10 14 19 20 10 lbs 9 oz PUH42EK PUH42EK1 0 5 10 14 19 20 12 lbs 9 oz PUH42EK7 PUH42EK71 0 5 10 14 19 20 11 lbs 0 oz Service Ref.
OC245-C--1.qxp 02.12.19 9:58 AM Page 7 3. NOISE CRITERION CURVES MICROPHONE 3.3ft UNIT 3.3ft Ambient temperature 80°F Test conditions are based on JIS Z8731 GROUND SPL(dB) 53 PUH24EK PUH24EK1 LINE OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
Handle for moving 3-3/4 4 For 10 units or less Rear piping hole 1/2 5-7/16 Rear fresh air intake Side air intake 8 40 1/4 11-5/8 Outlet guide installation hole 20-5/18 1-9/16 Drain hole Handle for moving 1 2 1 Air intake 17-3/18 34-1/4 Drain hole 1/2x7/8 Oval holes (standard bolt W3/8(M10) 20-5/8 11-7/8 Air outlet Air intake 14-1/4 1/2 15-7/8 1/2 36 Service panel Ground terminal Handle for moving 2-3/8 1/2 4 1/ R Bottom piping hole 3/ 16 2-9/16 4-3/4 2-3/8 Front ri
Handle for moving 5-7/16 3-3/4 1/2 Rear piping hole For 10 units or less 12 40 Rear fresh air intake Side air intake 1 1/4 11-5/8 Outlet guide installation hole 1-9/16 Drain hole Handle for moving 1 Air intake 20-5/8 2-3/8 20-5/8 6 2 23-1/16 13-9/16 34-1/4 Drain hole 2-1/2x7/8 Oval holes (standard bolt M10)W3/8(M10) 20-5/8 11-7/8 Air outlet Air intake 1-1/16 Handle for moving Ground terminal 2-3/8 1/2 2-U-shaped notched holes 1/2 4 1/ R 2-9/16 3/8 4-3/4 2-3/8 36 Front
Handle for moving 5-7/16 3-3/4 1/2 Rear piping hole For 10 units or less 12 Rear fresh air intake Side air intake 40 7/8 1/4 13-9/16 Outlet guide installation hole 1-9/16 Drain hole Handle for moving 1 Air intake 20-5/8 2-3/8 20-5/8 38-3/16 Drain hole 2-1/2x7/8 Oval holes (standard bolt W3/8(M10) 20-5/8 13-7/8 Air outlet Air intake 23-5/8 Handle for moving Ground terminal 2-3/8 1/2 Bottom piping hole 2-U-shaped notched holes 1/2 4 1/ R 2-3/8 4-3/4 (for N.E.
OC245-C--1.qxp 02.12.19 9:58 AM 8 Page 11 WIRING DIAGRAM MODEL : PUH18EK COMPRESSOR CAPACITOR FAN CAPACITOR FUSE<6A> FAN CONTROLLER CRANKCASE HEATER LED COMPRESSOR FAN MOTOR OUTDOOR CONTROLLER BOARD SW1•2•3<0.B> T TB1,3 X11 X12 X13 O.
OC245-C--1.qxp 02.12.19 9:58 AM Page 12 MODELS : PUH24EK PUH24EK1 PUH30EK PUH30EK1 PUH30EK2 HC CRANKCASE HEATER MC COMPRESSOR MOTOR(INNER THERMOSTAT) X12(O.B) COMPRESSOR RELAY C1,2 FAN MOTOR CAPACITOR MF1,2 FAN MOTOR(INNER THERMOSTAT) X13(O.B) 21S4 RELAY C COMPRESSOR CAPACITOR O.B OUTDOOR CONTROLLER BOARD X14(O.B) 21R RELAY FC(O.B) FAN CONTROLLER SW1•2•3(O.B) SELECT SWITCH(CHECK,SERVICE) ZNR(O.B) VARISTOR F(O.
OC245-C--1.qxp 02.12.19 9:58 AM Page 13 MODELS : PUH36EK PUH36EK1 PUH36EK2 PUH42EK PUH42EK1 PUH42EK7 HC CRANKCASE HEATER MC COMPRESSOR MOTOR(INNER THERMOSTAT) X13(O.B) 21S4 RELAY C1,2 FAN MOTOR CAPACITOR MF1,2 FAN MOTOR(INNER THERMOSTAT) X14(O.B) 21R RELAY C COMPRESSOR CAPACITOR O.B OUTDOOR CONTROLLER BOARD ZNR(O.B) VARISTOR C5 COMPRESSOR START CAPACITOR SW1•2•3(O.B) SELECT SWITCH(CHECK,SERVICE) 52C COMPRESSOR CONTACTOR FC(O.
OC245-C--1.qxp 02.12.19 9:58 AM Page 14 MODEL : PUH42EK71 SYMBOL NAME SYMBOL NAME SYMBOL NAME MC COMPRESSOR MOTOR(INNER THERMOSTAT) X12(O.B) COMPRESSOR RELAY FAN MOTOR CAPACITOR MF1,2 FAN MOTOR(INNER THERMOSTAT) X13(O.B) 21S4 RELAY COMPRESSOR CAPACITOR O.B OUTDOOR CONTROLLER BOARD X14(O.B) 21R RELAY FC(O.B) FAN CONTROLLER SW1·2·3(O.B) SELECT SWITCH(CHECK,SERVICE) ZNR(O.B) VARISTOR F(O.
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OC245-C--1.qxp 10 02.12.19 9:58 AM Page 16 MICROPROCESSOR CONTROL 1. OUTDOOR UNIT CONTROL 1 Outdoor fan control The rotational frequency of outdoor fan is phase-controlled according to the outdoor coil temperature. This control allows the cooling operation even with the low outside-air temperature and the heating operation even with the high outside-air temperature. 2 Outdoor unit control The outdoor unit turns ON/OFF the cooling/heating operation according to orders given from the indoor unit.
OC245-C--1.qxp 02.12.19 9:58 AM Page 17 5 Defrosting in HEAT mode Defrosting stops. Defrosting starts. Indoor unit ON Indoor fan OFF Auto vane ON OFF Set direction (Remote controller still displays set direction.) Set direction Outdoor unit ON 4-way valve OFF Bypass valve ON OFF Outdoor fan ON OFF Compressor ON OFF (1) Start conditions A. When all of the following conditions are satisfied, defrosting will start.
OC245-C--1.qxp 02.12.19 9:58 AM Page 18 (3) Defrost interval The defrost interval time is determined as follows. ● Initial defrost interval is 50 minutes. ● The defrost interval after defrosting depends on the preceding defrosting time as shown below.
OC245-C--1.qxp 02.12.19 9:58 AM Page 19 7 Service functions (1) Compulsory defrosting 1When all of the following conditions are satisfied, pressing SW2 starts the compulsory defrosting. ● During HEAT mode ● The compressor is ON. ● The outdoor coil temperature is being displayed by LED. (Outdoor controller board dip switch SW3-1 : OFF, SW3-2 : ON) ● The outdoor coil thermistor reads 46°F or below.
OC245-C--1.qxp 11 02.12.19 9:58 AM Page 20 TROUBLESHOOTING 1. SERVICE DATA INDICATION BY SWITCHES ON OUTDOOR CONTROLLER BOARD Setting dip switches SW2 and SW3 on the outdoor controller board enables LED to show the output state and check code. Output state is shown by LED lighting, and check code by blinking. SW1 : Turning SW1 ON clears the check code. If SW1 is turned ON while the check code is blinking , the indication changes to output state indication.
OC245-C--1.qxp 02.12.19 9:58 AM Page 21 1-1 Outdoor coil temperature To obtain data on the outdoor coil temperature, add the number of bits of lighting LEDs, and see the graph to find the temperature. ˚F 212 (Short 38 bits) 176 140 Temperature 104 68 32 -4 -40 (Open 219 bits) 0 50 100 150 200 255 Number of bits 1-2 Fan output step To obtain data on the fan output step, add the number of bits of lighting LEDs, and see the graph below to find the fan rotational frequency.
OC245-C--1.qxp 02.12.19 9:58 AM Page 22 2. TROUBLESHOOTING ACCORDING TO CHECK CODE Blinking Diagnosis of malfunction LED LD1 Reversed phase Cause Check point This model does not have this function. No need to be checked. This model does not have this function. No need to be checked. LD2 Open phase LD3 Outdoor coil thermistor is ● Outdoor coil thermistor is abnormal. (Open circuit or short broken. circuit) ● Thermistor was connected incorrectly.
OC245-C--1.qxp 02.12.19 9:58 AM Page 23 4. WRONG WIRING ON SITE 4-1 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.
OC245-C--1.qxp 02.12.19 9:58 AM Page 24 5. HOW TO CHECK THE PARTS PUH18EK PUH24EK PUH30EK PUH24EK1 PUH30EK1 PUH30EK2 PUH36EK PUH36EK1 PUH36EK2 Parts name OUTDOOR COIL THERMISTOR (RT) FAN MOTOR(MF,1,2,3,4) Protector [PUH18,24] PUH42EK PUH42EK1 PUH42EK7 PUH42EK71 Check points Disconnect the connector then measure the resistance using a tester. (Surrounding temperature 50°F~86°F) Normal Abnormal 4.3k"~9.6k" Open or short Measure the resistance between the terminals using a tester.
OC245-C--1.qxp 12 02.12.19 9:58 AM Page 25 DISASSEMBLY INSTRUCTIONS NOTE : All panels are clasped, and should be removed by shifting up and down. Outdoor unit (PUH18EK) OPERATING PROCEDURE PHOTOS 1. Electrical parts (1) Remove top panel (3 screws in front, 2 screws in rear) (2) Remove cover panel (1 screw). The panel is anchored by clicks to the side panel. Remove by pulling towards you. (3) Remove cover panel (1 screw). The panel is anchored by clicks on the right and left sides.
OC245-C--1.qxp 02.12.19 9:58 AM Page 26 OPERATING PROCEDURE PHOTOS 3. Heat Exchanger, Compressor (1) Remove the rear panel (2 screws in front, 1 screw on the side, 3 screws in the rear). Remove the valve bed, and open the rear panel to the rear to remove. NOTE : All panels are clasped, and must be removed by shifting up and down. (2) Remove right side panel (4 screws). (3) Remove rear guard (3 screws). (4) Remove separator support plate (4 screws). (5) Remove motor support (2 screws).
OC245-C--1.qxp 02.12.19 9:58 AM Page 27 NOTE : All panels are clasped, and should be removed by shifting up and down. Outdoor unit (PUH24EK) OPERATING PROCEDURE PHOTOS 1. Electrical parts (1) Remove top panel (3 screws in front, 2 screws in rear) (2) Remove cover panel (1 screw). The panel is anchored by clicks to the side panel. Remove by pulling towards you. (3) Remove cover panel (1 screw). The panel is clasped on the right and left sides.
OC245-C--1.qxp 02.12.19 9:58 AM Page 28 OPERATING PROCEDURE PHOTOS 3. Heat Exchanger, Compressor (1) Remove the rear / right side panel (2 screws in front, 1 screw on the side, 3 screws in the rear). Remove the electrical box, valve bed, and open to the rear to remove (anchors attached). (2) Remove right side panel (4 screws). (3) Remove rear guard (3 screws). (4) Remove separator support plate (4 screws). (5) Remove motor support (2 screws). (6) Remove valve bed (5 screws).
OC245-C--1.qxp 02.12.19 9:58 AM 13 Page 29 PARTS LIST STRUCTURAL PARTS PUH18EK 9 10 8 1 7 2 4 3 5 Q'ty / set No. Parts No.
OC245-C--1.qxp 02.12.19 9:58 AM Page 30 STRUCTURAL PARTS PUH24EK PUH24EK1 11 10 9 1 8 2 3 4 4 2 7 5 6 Q'ty / set No. Parts No.
OC245-C--2.qxp 02.12.19 10:10 AM Page 31 STRUCTURAL PARTS PUH30EK PUH36EK PUH42EK PUH42EK7 PUH30EK1 PUH36EK1 PUH42EK1 PUH42EK71 PUH30EK2 PUH36EK2 11 10 8 9 1 2 7 3 4 4 6 5 No. Parts No. Parts Name Specifications 1 R01 A14 662 SIDE PANEL Q'ty / set PUH 30,36EK 30,36EK2 42EK 30,36EK1 42EK1 1 1 1 Wiring Remarks Diagram (Drawing No.
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OC245-C--2.qxp 02.12.19 10:10 AM Page 33 Part number that is circled is not shown in the illustration. Q'ty / set No. Parts No. Parts Name Specifications PUH 18EK 1 T7W 850 763 FAN MOTOR S6V-85FPH 1 Wiring Remarks Diagram (Drawing No.
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OC245-C--2.qxp 02.12.19 10:10 AM Page 35 Part number that is circled is not shown in the illustration. Q'ty / set No. Parts No. Parts Name PUH Specifications Wiring Remarks Diagram (Drawing No.
OC245-C--2.qxp 02.12.19 10:12 AM Page 36 FUNCTIONAL PARTS PUH30EK PUH36EK PUH30EK1 PUH36EK1 PUH30EK2 PUH36EK2 30 29 28 27 26 25 24 23 22 21 31 20 19 18 17 16 15 14 13 12 11 1 2 10 9 30 8 31 1 2 3 4 5 7 6 Q'ty / set No. Parts No. Parts Name 1 T7W 852 763 FAN MOTOR Specifications Wiring Remarks Diagram (Drawing No.
OC245-C--2.qxp 02.12.19 10:12 AM Page 37 Part numbers that are circled are not shown in the illustration. Q'ty / set No. Parts No. Parts Name Specifications Wiring Remarks Diagram (Drawing No.
OC245-C--2.qxp 02.12.19 10:12 AM FUNCTIONAL PARTS PUH42EK PUH42EK1 PUH42EK7 PUH42EK71 Page 38 34 33 32 31 30 29 28 27 26 25 24 23 22 35 21 20 19 18 17 16 15 14 13 12 1 2 11 10 9 34 8 35 1 2 3 4 5 7 6 Q'ty / set No. Parts No. Parts Name 42EK 42EK1 1 T7W 853 763 FAN MOTOR Wiring Remarks Diagram (Drawing No.
OC245-C--2.qxp 02.12.19 10:12 AM Page 39 Part numbers that are circled are not shown in the illustration. Q'ty / set No. Parts No. Parts Name 42EK 42EK1 9 R01 47L 410 BALL VALVE 1/2 10 R01 42L 450 STRAINER 1 1 1 1 1 1 1 1 1 1 1 1 11 R01 86H 201 DISCHARGE THERMAL SWITCH 12 13 Wiring Remarks Diagram (Drawing No.
OC245-C--2.qxp 02.12.19 10:12 AM Page 40 TM cCopyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Dec. 2002 No.OC245 REVISED EDITION-C 17 Distributed in Dec. 2002 No.OC245 REVISED EDITION-B 17 Distributed in May 2001 No.OC245 REVISED EDITION-A 25 Distributed in Mar. 2001 No.OC245 20 New publication, effective Dec. 2002 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.
