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Mitsubishi Electric PKH18FK3 Technical & Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Wall Mounted
Series PKH
PKH18FK3
[Models]
PKH24FK3
PKH30FK3
PKH36FK3
TIMER OFF TIMER
CLOCK AUTO AUTO
CHECK SET TEMP.
Remote controller
SWING
FAN
START STOP
SPEED
FILTER
AUTO
CHECK MODE
RETURN
TEST RUN
Revision:
The wrong descriptions in REFRIGERANT
SYSTEM DIAGRAM have been modified.
(Page 21.)
The wrong descriptions in WIRING DIAGRAM
have been modified.
(Page 22.)
Restrictor valve and capillary tube have been
added to "Specifications" of heat exchanger.
(Page 58.)
Please void OC273.
CONTENTS
1. TECHNICAL CHANGE ·············································2
2. FEATURES ·······························································2
3. PART NAMES AND FUNCTIONS ····························5
4. SPECIFICATIONS·····················································7
5. DATA ·········································································8
6. OUTLINES AND DIMENSIONS······························19
7. REFRIGERANT SYSTEM DIAGRAM ····················21
8. WIRING DIAGRAM ·················································22
9. OPERATION FLOW-CHART ··································23
10. MICROPROCESSOR CONTROL ···························27
11. TROUBLESHOOTING ············································44
12. SYSTEM CONTROL ···············································50
13. DISASSEMBLY PROCEDURE ·······························55
14. PARTS LIST ····························································58
15. OPTIONAL PARTS ·················································61
C
US
No. OC273
REVISED EDITION-A
TM

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Summary of Contents for Mitsubishi Electric PKH18FK3

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OC273 REVISED EDITION-A TECHNICAL & SERVICE MANUAL Wall Mounted Series PKH PKH18FK3 [Models] Revision: The wrong descriptions in REFRIGERANT PKH24FK3 SYSTEM DIAGRAM have been modified. (Page 21.) PKH30FK3 The wrong descriptions in WIRING DIAGRAM have been modified.

  • Page 2: Technical Change

    TECHNICAL CHANGE PKH18FK PKH18FK3 PKH24FK PKH24FK3 PKH30FK PKH30FK3 PKH36FK PKH36FK3 INDOOR CONTROLLER BOARD has changed. 1) From TRANSFORMER to POWER BOARD. 2) From JUMPER CONNECTOR (J1) to DIP SWITCH (SW1). 3) From JUMPER CONNECTOR (J5) to DIP SWITCH (SW5). 4) The number of switches of SW7 changed from 4 to 3 pieces.
  • Page 3 4. ADVANCED MICROPROCESSOR [Remote controller] (1) Easy to Use Microprocessor 1) Ultra-Thin Remote Controller The streamlined, wide controller is designed to blend with any kind of interior and the adoption of SWING a sophisticated microprocessor allows you to DRY COOL TIMER OFF TIMER CLOCK AUTO AUTO AUTO...
  • Page 4 6. 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. 7.

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS Remote controller Settings remain in effect until changed. Air conditioner can be operated by simply pushing ON/OFF button once settings have been made. Remote controller operation buttons CLOCK/TIMER button TIMER ON/OFF button This sets or switches the current time,start time and stop time.

  • Page 6: Remote Controller Display

    Remote controller display In this display example on the bottom left, a condi- CENTRALLY CLOCK display tion where all display lamps light is shown for CONTROLLED display explanation purposes although this differs from The current time , start time and stop time can be displayed in ten second actual operation.

  • Page 7: Specifications

    SPECIFICATIONS MODELS : PKH18FK3, PKH24FK3, PKH30FK3, PKH36FK3 Model PKH18FK3 PKH24FK3 PKH30FK3 PKH36FK3 Item Cooling *1 Btu/h 18,000 24,000 30,000 34,200 18,600 [ 24,100/25,100 ] 25,000 [ 30,500/31,500 ] 33,000 [ 39,100/40,500 ] 38,000 [ 44,100/45,500 ] Capacity Heating *1 Btu/h...

  • Page 8: Data

    DATA MODELS : PKH18FK3, PKH24FK3, PKH30FK3, PKH36FK3 1. PERFORMANCE DATA 1) COOLING CAPACITY Outdoor intake air DB temperature ( ˚F ) Models Airflow Models ( CFM ) ( ˚F ) 21.0 14.4 1.56 20.2 13.9 1.69 19.4 13.3 1.84 18.5 12.7...
  • Page 9 Models 208V Models 230V Airflow ( ˚F ) (CFM) 12.1 1.20 14.1 1.34 16.3 1.49 18.7 1.65 21.4 1.83 23.7 1.99 PKH18FK3 12.4 1.16 14.4 1.29 16.7 1.44 19.1 1.59 21.8 1.76 24.1 1.91 12.7 1.11 14.7 1.24 17.0 1.38 19.5...
  • Page 10 2. PERFORMANCE CURVE NOTES : A point on the curve shows the reference point. <PKH18FK3> COOLING CAPACITY HEATING CAPACITY SHF=0.82 Does not include booster heater (1.9kW) Indoor intake air WB temperature ( F) Indoor intake air DB temperature ( F)
  • Page 11 NOTES : A point on the curve shows the reference point. <PKH30FK3> COOLING CAPACITY HEATING CAPACITY Does not include booster heater(2.2kW) SHF=0.75 indoor intake air DB temperature(°F) indoor intake air WB temperature(°F) indoor intake air DB temperature(°F) indoor intake air WB temperature(°F) 0 23 32 35 55 65 (67) 75 Outdoor intake air WB temperature(°F)
  • Page 12 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. <PKH18FK3> COOLING MODE (psi.G) (psi.G) Indoor DB temperature( F)
  • Page 13 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. <PKH24FK3> COOLING MODE (psi.G) (psi.G) Indoor DB temperature( F) Indoor DB temperature( F) DB( F) DB( F) Outdoor ambient temperature Outdoor ambient temperature...
  • Page 14 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. <PKH30FK3> COOLING MODE (psi.G) (psi.G) Indoor DB temperature( F) Indoor DB temperature( F) DB( F) DB( F) Outdoor ambient temperature Outdoor ambient temperature...
  • Page 15 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. <PKH36FK3> COOLING MODE (psi.G) (psi.G) Indoor DB temperature( F) Indoor DB temperature( F) DB( F) Outdoor ambient temperature DB( F) Outdoor ambient temperature...
  • Page 16 4. STANDARD OPERATION DATA Models PKH18FK3 PKH24FK3 PKH30FK3 PKH36FK3 Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating Voltage 208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230 Frequency Total input 1.79 1.56 2.36 2.37 3.12 3.02 3.44 3.54 Indoor fan current Booster heater current 7.6/8.4...
  • Page 17 ( ft/sec ) range ( ft ) 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. 16.1 PKH18FK3 PKH24FK3 16.1 17.7 PKH30FK3 PKH36FK3 17.7...
  • Page 18 8. NOISE CRITERION CURVES Unit Ambient temperature 80˚F Wall Test conditions are based on JIS Z8731 3.3ft PKH18FK3 SPL(dB) LINE NOTCH 3.3ft PKH24FK3 NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 500 1000 2000 4000 8000...

  • Page 19: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Indoor Unit Unit : inch PKH18FK3 PKH24FK3...
  • Page 20 PKH30FK3 Unit : inch PKH36FK3...

  • Page 21: Refrigerant System Diagram

    Pipe temperature Refrigerant pipe Restrictor thermistor / Liquid (option) valve (RT2) {3/8" Distributor (with heat insulator) Flared connection Capillary tube PKH18FK3 : ({0.126x{0.071x19.7) PKH24FK3 Refrigerant pipe (option) {5/8" (with heat insulator) Flared connection Strainer Refrigerant pipe Pipe temperature Restrictor (option)

  • Page 22: Wiring Diagram

    WIRING DIAGRAM MODELS PKH18FK3, PKH24FK3, PKH30FK3, PKH36FK3 WIRING DIAGRAM POWER SUPPLY ~(1PHASE) AC208/230V 60Hz GRN/YLW (DC13.1V) (AC208/230V) GROUND CN2S (WHT) CNSK(RED) TRANS POWER POWER 1 3 5 CNDK (WHT) VANE SW18 (WHT) (RED) CN2D CN6V (WHT) (WHT) 5 4 3 2 1...

  • Page 23: Operation Flow-Chart

    OPERATION FLOW-CHART MAIN OPERATION START Power circuit breaker Check SW ON twice Operation SW “OFF” timer Set time “ON” timer complete Set time complete Trouble Remote controller operation display STOP Trouble STOP Operating mode (COOL) COOL operation PROTECTION DEVICE PROTECTION DEVICE SELF HOLD RELEASE SELF HOLD Operating mode...

  • Page 24: Cooling Operation

    COOLING OPERATION COOL operation Four-way valve/OFF Initial COOLING Vane initial setting Vane 55 deg downward angle 70 deg downward angle Fan speed Downward discharge 1 hour Vane horizontal Vane setting notch airflow Compressor thermostat ON Allowance cancel 3-minute time delay 6-minute Allowance time delay...

  • Page 25: Dry Operation

    DRY OPERATION operation Four-way valve / OFF Initial dry operation Vane Vane initial setting setting notch Room temperature is 64°F or lower During compressor ON 3-minute 3-minute compressor time delay operation Compressor & Compressor & thermostat thermostat ON 10-minute Compressor ON compressor time completes Compressor ON...

  • Page 26: Heating Operation

    HEATING OPERATION Heat operation w 11 w 15 3-minute initial Heating area Auxiliary heater HEATING Vane setting Defrost release Vane initial Indoor coil Defrost notch setting thermistor is 140°F 30 min. elapse or higher defrosting Outdoor unit FAN speed trouble Low notch Four-way valve ON...

  • Page 27: Indoor Unit

    MICROPROCESSOR CONTROL 1. OUTLINE OF MICROPROCESSOR CONTROL Remote controller board INPUT to remote controller OUTPUT to remote controller Processes and transmits OFF-ON switching. orders. Remote controller COOL/DRY-AUTO-HEAT selector switching. LCD indicator Thermostat setting. TIMER mode selector-switching and Timer setting. SWING TIMER OFF TIMER CLOCK AUTO AUTO HIGH-LOW fan speed switching.

  • Page 28: Indoor Unit Control

    2. INDOOR UNIT CONTROL 2-1 COOL operation <How to operate> 1 Press the ON/OFF button. 2 Press MODE button to set operation mode to Cool. 3 To set desired temperature, press SET TEMP.button. SWING DRY COOL TIMER OFF TIMER CLOCK AUTO AUTO AUTO CHECK SET TEMP.
  • Page 29 (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.
  • Page 30 (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.
  • Page 31 (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 dif- ference is still out of RANGE C,the outdoor unit is functioning abnormally.
  • Page 32 2-2 DRY operation <How to operate> SWING 1 Press POWER ON/OFF button. TIMER OFF TIMER CLOCK AUTO AUTO CHECK SET TEMP. START STOP FILTER SPEED AUTO CHECK MODE RETURN 2 Press the MODE button to display “DRY” TEST RUN 3 Press the SET TEMP. button to set the desired temperature. NOTE: The set temperature changes 2°F when the SET TEMP.
  • Page 33 (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.
  • Page 34 2-3 HEAT operation <How to operate> 1 Press POWER ON/OFF button. 2 Press the MODE button to display “HEAT” 3 Press the SET TEMP. button to set the desired temperature. SWING TIMER OFF TIMER CLOCK AUTO AUTO CHECK SET TEMP. START STOP FILTER SPEED...
  • Page 35 (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.
  • Page 36 (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.
  • Page 37 (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.
  • Page 38 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” SWING TIMER OFF TIMER CLOCK AUTO AUTO CHECK SET TEMP. START STOP FILTER SPEED 3 Press the SET TEMP. button to set the desired temperature. AUTO CHECK MODE RETURN...
  • Page 39 2-5 Auto vane control <How to operate> To change the air flow direction, press AIR DISCHARGE button. SWING DRY COOL TIMER OFF TIMER CLOCK AUTO AUTO AUTO CHECK SET TEMP. START STOP SPEED AUTO HEAT RETURN MODE TIMER ON/OFF CLOCK/TIMER FAN SPEED AIR DISCHARGE FILTER AIR SWEEP CHECK SET TEMP.
  • Page 40 2-6 TIMER operation WIRED REMOTE CONTROLLER <Timer function> AUTO STOP ·········The air conditioner stops after the set time lapses. AUTO START ········The air conditioner starts after the set time lapses. AUTO OFF ············Timer is not active. <How to operate> SWING 1.
  • Page 41 (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.
  • Page 42 2-9 Dip switch functions Each figure shows the initial factory setting. (1). On remote controller board 1. SW17(Address selector) 1 2 3 4 5 6 7 8 SW17-1~6) For address setting SW17-7) When two remote controllers are used,this switch sets the controller function. OFF:The remote controller is set as a main controller.
  • Page 43 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. PKH18FK3 PKH24FK3 PKH30FK3 PKH36FK3 1 2 3...

  • Page 44: Troubleshooting

    TROUBLESHOOTING 1. TROUBLES IN TEST RUN Symptom Cause Check points The display “CENTRALLY 1) Wrong address setting of remote con- 1) Check the address setting of remote controller CONTROLLED” on remote troller/indoor controller board. and indoor controller. controller does not disap- 2) Timer adapter is connected to the 2) Make sure the timer adapter is used correctly.

  • Page 45: Wired Remote Controller

    2. SELF DIAGNOSTIC FUNCTION WITH REMOTE CONTROLLER (WIRED REMOTE CONTROLLER) 2-1 When malfunction occurs during operation When a malfunction occurs, the indoor and outdoor units stop and the malfunction is displayed on the LCD of the remote controller. (1) ON the set temperature display part, “CHECK” appears, and the unit CHECK mode address and the check code are displayed alternately at one-second intervals.
  • Page 46 Check Diagnosis of malfunction Cause Check points code Signal transmitting/receiving During individual unit control 1) Check the transmission wire. error 1) Bad contact of transmission 2) Check with another remote controller. If “E0” is (Indoor controller does not wire still indicated, replace the indoor controller respond to remote controller 2) Signal transmitting/receiving cir- board.
  • Page 47 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...
  • Page 48 4. OTHER TROUBLES AND CAUSES Vanes do not work. Vane motor is damaged. Vane motor does not work. Vane motor relay is damaged. Connector is poorly connected. Vane motor is poorly assembled. Indoor controller board is damaged. Unit stops after 5 to Refer to check code on remote controller display.
  • Page 49 5. HOW TO CHECK THE PARTS Parts name Check points Room temperature Disconnect the connector, then measure the resistance using a tester. thermistor (RT1) (Surrounding temperature 50°F to 86°F) Pipe temperature thermistor (RT2) Normal Abnormal (Refer to the thermistor) 4.3k to 9.6k Open or short Fan motor (MF)

  • Page 50: System Control

    SYSTEM CONTROL 1. VARIETY OF SYSTEM CONTROL FUNCTIONS Many units, installed at different locations, can be started 1 Group control with and controlled with a single remote controller. The remote a single remote controller can be mounted in a different location using a controller non-polar two-wire cable, which can be extended up to (See page OC273-...
  • Page 51 2. GROUP CONTROL WITH A SINGLE REMOTE CONTROLLER A maximum of 50 units can be started in order according to the dip switch settings 2-1 How to wire Figure 1 (1) Connect the remote controller to the double terminal block on the indoor controller board of the master unit (No.0 unit).
  • Page 52 3. CONTROL USING TWO REMOTE CONTROLLERS Two remote controllers can be used to control either one unit or a group of units. Units operate according to the latest com- mand from either of the two remote controllers. Before operation, be sure to set one remote controller as the “main controller” and the other as the “sub controller”, using dip switch SW17-7 of the remote controller.
  • Page 53 NOTE1 : Install the relay box where it can be serviced easily. NOTE2 : For control circuit wiring, use a wire of No. 14 AWG or a control cable according to the power supply of control circuit. NOTE3 : When the power supply of the control circuit is 208/230V AC, Do not connect the control circuit wire to the remote controller cable directly.

  • Page 54: Auto Restart Function

    6. MULTIPLE REMOTE CONTROL DISPLAY Indoor controller board You can control several units with a multiple remote control display, by wiring an optional multiple display adapter (PAC-SA88HA-E) with relays and lamps on the market. How to wire (1) Connect the multiple display adapter to the connector CN51 on the indoor controller board.

  • Page 55: Disassembly Procedure

    DISASSEMBLY PROCEDURE Indoor unit PKH24FK3 OPERATING PROCEDURE PHOTOS&ILLUSTRATION 1. Removing the lower side of the indoor unit from the instal- lation plate Figure 1 (1) Remove the 2 screws. Hanger of indoor unit Hang the indoor unit hangers to the catches on the instal- lation plate.
  • Page 56 OPERATING PROCEDURE PHOTOS&ILLUSTRATION (8) Remove the screws of the indoor controller board case, Relay Photo 3 and pull out the indoor controller board case. Then the transformer and the capacitor and relay can be serviced. Power board Capacitor Indoor controller board case Electrical box 5.
  • Page 57 OPERATING PROCEDURE PHOTOS 8. Removing the line flow fan and the fan motor Photo 7 (1) Remove the left and right side panels. Screw Line flow fan (2) Remove the grilles. (3) Remove the electrical box. Fan motor (4) Remove the drain pan. (5) Loosen the screw that fixes the line flow fan to the fan motor.

  • Page 58: Parts List

    PARTS LIST ELECTRICAL PARTS PKH18FK3 PKH24FK3 PKH30FK3 32·33 PKH36FK3 13 14 18 19 Q'ty / set Wiring Remarks Parts No. Parts Name Specifications Diagram (Drawing No.) Symbol R01 005 103 SLEEVE BEARING R01 Z61 102 BEARING MOUNT R01 12G 114...
  • Page 59 Q'ty / set Wiring Remarks Parts No. Parts Name Specifications Diagram (Drawing No.) Symbol T7W E13 529 DRAIN PAN T7W E14 529 DRAIN PAN CENTER COVER R01 12G 621 JOINT SHAFT R01 12G 063 AUTO VANE R01 12G 002 AUTO VANE R01 16G 002 DRAIN HOSE R01 KV5 527...
  • Page 60 STRUCTURAL PARTS PKH18FK3 PKH24FK3 PKH30FK3 PKH36FK3 Part numbers that is circled is not shown in the figure. Q'ty / set Wiring Remarks Parts No. Parts Name Specifications Diagram (Drawing No.) Symbol R01 12G 662 LEFT SIDE PANEL R01 E01 812...

  • Page 61: Optional Parts

    OPTIONAL PARTS 1. TIMER When using a program timer, a program timer adapter (PAC-825AD) is also needed. (PAC-825AD is included with PAC-SC32PTA.) Part No. PAC-SC32PTA (with set back function) Model Name Program timer 1-1 Program timer specifications Parts name Program timer Parts No.

  • Page 62: Names And Functions

    1-4 Names and functions <PAC-SC32PTA> SET BACK DISPLAY DAILY TIMER SETTING DISPLAY WEEKLY TIMER SETTING DISPLAY CURRENT TIME DISPLAY During MONITOR status,current Sets timer for a week. Indicates the set back range. 24 hours is divided into 48 blocks and each time is display.
  • Page 64 2001 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Nov. 2003 No.OC273 REVISED EDITON-A PDF 9 New publication, effective Nov. 2003 Distributed in Dec. 2001 No.OC273 Specifications subject to change without notice.
  • Page 65 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.

This manual is also suitable for:

Pkh24fk3Pkh30fk3Pkh36fk3

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