Mitsubishi PLH-3AK.UK Technical & Service Manual
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Mitsubishi PLH-3AK.UK Technical & Service Manual

Mitsubishi PLH-3AK.UK Technical & Service Manual

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Table of Contents

SPLIT-TYPE, HEAT PUM PAIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Ceiling Cassettes
Series PLH
Indoor unit
[Model names]
PLH-3AK
PLH-3AKH
PLH-4AKS
PLH-4AKHS
PLH-5AKS
PLH-5AKHS
PLH-6AKS
PLH-6AKHS
Model name
indication
FILTER
CHECK MODE
TEST RUN
WIRED REMOTE
CONTROLLER
[Service Ref.]
PLH-3AK.UK
PLH-3AK
PLH-3AKH.UK
PLH-3AKH
PLH-4AKS.UK
PLH-4AKS
PLH-4AKHS.UK
PLH-4AKHS
PLH-5AKS.UK
PLH-5AKS
PLH-5AKHS.UK
PLH-5AKHS
PLH-6AKS.UK
PLH-6AKS
PLH-6AKHS.UK
PLH-6AKHS
INDOOR UNIT
CHECK TEST RUN
MODEL SELECT
˚C
AMPM
AMPM
NOT AVAILABLE
ON/OFF
TEMP
ON/OFF
PLH- •AK.UK
PLH- •AK
.UK
1
PLH- •AKH.UK
PLH- •AKH
.UK
1
PLH- •AKS.UK
PLH- •AKS
.UK
1
PLH- •AKHS.UK
PLH- •AKHS
.UK
1
WIRELESS REMOTE
CONTROLLER
.UK
1
.UK
1
.UK
1
.UK
1
.UK
1
.UK
1
.UK
1
.UK
1
CONTENTS
1. TECHNICAL CHANGES·······················2
2. PART NAMES AND FUNCTIONS ········3
3. SPECIFICATIONS·································7
4. DATA ···················································11
5. OUTLINES AND DIMENSIONS··········24
6. WIRING DIAGRAM·····························26
8. OPERATION FLOW-CHART ··············28
10. TROUBLESHOOTING ························54
11. 4-WAY AIR FLOW SYSTEM ···············66
12. SYSTEM CONTROL ···························72
13. DISASSEMBLY PROCEDURE ···········77
14. PARTS LIST········································80
15. OPTIONAL PARTS ·····························85
No. OC211
REVISED EDITION-A
Revision:
• PLH-3AK
.UK, PLH-3AKH
.UK,
1
1
PLH-4AKS
.UK, PLH-4AKHS
1
PLH-5AKS
.UK, PLH-5AKHS
1
PLH-6AKS
.UK and
1
PLH-6AKHS
.UK are added in
1
REVISED EDITION-A.
• "14. PARTS LIST" has been
modified.
Note:
• This manual does not cover the
following outdoor units. When ser-
vicing them, please refer to the
following service manual and this
manual in a set.
[Service Ref.]
(OC150 REVISED EDITION-A)
PUH-3VKA
.UK PUH-3YKA
.UK
2
2
PUH-4YKSA
.UK
2
PUH-5YKSA
.UK
2
PUH-6YKSA
.UK
2
(OC184)
PUH-4VKSA.UK
• Please void OC211.
.UK,
1
.UK,
1

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Summary of Contents for Mitsubishi PLH-3AK.UK

  • Page 1: Table Of Contents

    .UK, PLH-5AKHS .UK, Indoor unit PLH-6AKS .UK and [Model names] [Service Ref.] PLH-6AKHS .UK are added in REVISED EDITION-A. PLH-3AK.UK PLH-3AK • “14. PARTS LIST” has been PLH-3AK modified. PLH-3AKH.UK PLH-3AKH Note: PLH-3AKH • This manual does not cover the PLH-4AKS.UK...

  • Page 2: Technical Changes

    S70 E00 202 PLH-6AKS.UK TEMPERATURE PLH-6AKHS.UK THERMISTOR Spare CONTROLLER BOARD are unified. Revise point Service Ref. Page parts code part code PLH-3AK.UK S70 E01 310 PLH-3AKH.UK S70 E02 310 FUNCTIONAL PARTS No.4 CONTROLLER PLH-4AKS.UK S70 E03 310 BOARD PLH-4AKHS.UK S70 E04 310 S70 E01 310* PLH-5AKS.UK...

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS Indoor Unit Filter Removes dust and pollutants from intake air Horizontal Air Outlet Sets airflow of horizontal automatically during cooling or dehumidifying. Grille Auto Air Swing Vane Disperses airflow up and down and adjusts the angle of airflow direction.
  • Page 4 Display In this display example on the bot- CENTRALLY display tom left, a condition where all dis- CONTROLLED display play lamps light is shown for expla- The current time , start time and stop nation purposes although this differs time can be displayed in ten second This indicates when the unit is con- intervals by pressing the time setting from actual operation.
  • Page 5 PLH-3AK.UK PLH-4AKS.UK PLH-5AKS.UK PLH-6AKS.UK PLH-3AKH.UK PLH-4AKHS.UK PLH-5AKHS.UK PLH-6AKHS.UK Wireless remote controller When cover is open. ADDRESS display display display Displays the refrigerant address. SET TEMP. display indicates desired tempera- Lights up while transmission to the indoor unit ture set. UNIT NO. display is mode using switches.
  • Page 6 PLH-3AK .UK PLH-4AKS PLH-5AKS .UK PLH-6AKS PLH-3AKH .UK PLH-4AKHS .UK PLH-5AKHS .UK PLH-6AKHS Wireless remote controller When cover is open. display CHECK TEST RUN CHECK&TEST RUN display indicates that the unit is being checked or test-run. display display MODEL SELECT Blinks when model is selected.

  • Page 7: Specifications

    SPECIFICATIONS PLH-3AK.UK PLH-3AK Service Ref. Item PLH-3AKH.UK PLH-3AKH Function Cooling Heating 26,300 28,700[35,800] Btu/h Capacity 7,700 8,400[10,500] Total input 3.32 3.11[5.21] PLH-3AK.UK PLH-3AK Service Ref. PLH-3AKH.UK PLH-3AKH Power supply(phase, cycle, voltage) Single, 50Hz, 220-240V Input 0.17 0.17[2.27] Running current 0.81 0.81[9.47]...
  • Page 8 PLH-4AKS.UK PLH-4AKS Service Ref. Item PLH-4AKHS.UK PLH-4AKHS Cooling Heating Function 33,100 35,500[44,400] Btu/h Capacity 9,700 10,400[13,000] 3.46 3.45[6.05] Total input Service Ref. PLH-4AKS.UK PLH-4AKS PLH-4AKHS.UK PLH-4AKHS Power supply(phase, cycle,voltage) Single, 50Hz, 220-240V 0.26 0.26[2.86] Input 1.25 1.25[11.93] Running current 2.0[12.7] Starting current External finish Grille : Munsell 0.70Y 8.59/0.97...
  • Page 9 PLH-5AKS.UK PLH-5AKS Service Ref. Item PLH-5AKHS.UK PLH-5AKHS Cooling Heating Function 42,300 47,800[58,000] Btu/h Capacity 12,400 14,000[17,000] 4.51 4.46[7.46] Total input PLH-5AKS.UK PLH-5AKS Service Ref. PLH-5AKHS.UK PLH-5AKHS Power supply(phase, cycle,voltage) Single, 50Hz, 220-240V 0.30 0.30[3.30] Input 1.43 1.43[13.77] Running current 2.0[14.3] Starting current External finish Grille : Munsell 0.70Y 8.59/0.97...
  • Page 10 PLH-6AKS.UK PLH-6AKS Service Ref. Item PLH-6AKHS.UK PLH-6AKHS Cooling Heating Function 47,800 54,900[65,200] Btu/h Capacity 14,000 16,100[19,100] 5.07 4.92[7.92] Total input PLH-6AKS.UK PLH-6AKS Service Ref. PLH-6AKHS.UK PLH-6AKHS Power supply(phase, cycle, voltage) Single, 50Hz, 220-240V Input 0.34 0.34[3.34] Running current 1.64 1.64[13.94] Starting current 2.0[14.3] External finish...

  • Page 11: Data

    DATA 1. PERFORMANCE DATA [50Hz] 1) COOLING CAPACITY(1) PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 7768 4972 0.64 2.66 7555 4835 0.64 2.77 7278 4658 0.64 2.99 8271 4301 0.52...
  • Page 12 COOLING CAPACITY(2) PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 6983 4469 0.64 3.20 6671 4269 0.64 3.42 6342 4059 0.64 3.64 7452 3875 0.52 3.28 7130 3708 0.52 3.51...
  • Page 13 COOLING CAPACITY(3) PLH-4AKS.UK PLH-4AKS PLH-4AKHS.UK PLH-4AKHS Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 9786 6752 0.69 2.77 9518 6567 0.69 2.89 9168 6326 0.69 3.11 10419 5939 0.57 2.83 10145 5783 0.57 2.95 9775 5572...
  • Page 14 COOLING CAPACITY(4) PLH-4AKS.UK PLH-4AKS PLH-4AKHS.UK PLH-4AKHS Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 8797 6070 0.69 3.34 8404 5798 0.69 3.56 7989 5512 0.69 3.79 9388 5351 0.57 3.42 8982 5120 0.57 3.65 8558 4878...
  • Page 15 COOLING CAPACITY(5) PLH-5AKS.UK PLH-5AKS PLH-5AKHS.UK PLH-5AKHS Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 12510 7881 0.63 3.61 12167 7665 0.63 3.77 11720 7384 0.63 4.06 13319 6793 0.51 3.69 12969 6614 0.51 3.85 12496 6373...
  • Page 16 COOLING CAPACITY(6) PLH-5AKS.UK PLH-5AKS PLH-5AKHS.UK PLH-5AKHS Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 11245 7085 0.63 4.35 10743 0.63 0.63 6768 4.64 10212 6434 4.94 12001 6120 0.51 4.46 11482 5856 0.51 4.76 10939 5579...
  • Page 17 COOLING CAPACITY(7) PLH-6AKS.UK PLH-6AKS PLH-6AKHS.UK PLH-6AKHS Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 14124 8616 0.61 4.06 13737 8380 0.61 4.24 13232 8072 0.61 4.56 15038 7369 0.49 4.15 14642 7175 0.49 4.32 14109 6913...
  • Page 18 COOLING CAPACITY(8) PLH-6AKS.UK PLH-6AKS PLH-6AKHS.UK PLH-6AKHS Outdoor intake air D.B.(°C) Indoor Indoor Intake air Intake air D.B.(°C) W.B.(°C) P.C. P.C. P.C. 12696 7745 0.61 4.89 12129 7399 0.61 5.22 11530 7033 0.61 5.55 13549 6639 0.49 5.01 12963 6352 0.49 5.35 12351 6052...
  • Page 19 D.B.(°C) P.C. P.C. P.C. P.C. P.C. P.C. 5752 2.12 6593 2.34 7514 2.58 8516 2.83 9595 3.10 10752 3.38 PLH-3AK.UK PLH-3AK 5508 2.29 6334 2.53 7231 2.78 8198 3.05 9235 3.34 10340 3.64 PLH-3AKH.UK 5293 2.43 6077 2.69 6944 2.97...
  • Page 20 3. ELECTRICAL DATA Indoor unit … 220V 50Hz 1phase Outdoor unit … 220V 50Hz 1phase / 380V 50Hz 3phase PLH-3AK.UK PLH-4AKS.UK PLH-5AKS.UK PLH-6AKS.UK PLH-3AK PLH-4AKS PLH-5AKS PLH-6AKS Service Ref. PLH-3AKH.UK PLH-4AKHS.UK PLH-5AKHS.UK PLH-6AKHS.UK PLH-3AKH PLH-4AKHS PLH-5AKHS PLH-6AKHS Mode Cool Heat...
  • Page 21 4. STANDARD OPERATION DATA PLH-3AK.UK PLH-4AKS.UK PLH-5AKS.UK PLH-6AKS.UK PLH-3AK PLH-4AKS PLH-5AKS PLH-6AKS Service Ref. PLH-3AKH.UK PLH-4AKHS.UK PLH-5AKHS.UK PLH-6AKHS.UK PLH-3AKH PLH-4AKHS PLH-5AKHS PLH-6AKHS Mode Cooling Heating Cooling Heating Cooling Heating Cooling Heating Capacity 7,700 8,400 9,700 10,400 12,400 14,000 14,000 16,100 Input 3.32...
  • Page 22 6. NOISE CRITERION CURVES PLH-3AK.UK PLH-4AKS.UK SPL(dB) LINE NOTCH SPL(dB) NOTCH LINE PLH-3AK PLH-4AKS PLH-3AKH.UK PLH-4AKHS.UK PLH-3AKH PLH-4AKHS NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20...
  • Page 23 UNIT Ambient temperature 27: CEILING Test conditions are based on JIS Z8731 1.5m MICROPHONE...

  • Page 24: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit : mm 1. INDOOR UNIT PLH-3AK.UK PLH-4AKS.UK PLH-5AKS.UK PLH-6AKS.UK PLH-3AK .UK PLH-4AKS .UK PLH-5AKS .UK PLH-6AKS PLH-3AKH.UK PLH-4AKHS.UK PLH-5AKHS.UK PLH-6AKHS.UK PLH-3AKH .UK PLH-4AKHS .UK PLH-5AKHS .UK PLH-6AKHS Ceiling hole 20~45 860~910 20~45 Branch duct hole Fresh air intake...
  • Page 25 2. REMOTE CONTROLLER Unit : mm FILTER FILTER CHECK MODE CHECK MODE TEST RUN TEST RUN Rear side wiring arrangement opening. CAUTION SW18 SW17...

  • Page 26: Wiring Diagram

    WIRING DIAGRAM PLH-3AK.UK PLH-4AKS.UK PLH-5AKS.UK PLH-6AKS.UK PLH-3AK .UK PLH-4AKS .UK PLH-5AKS .UK PLH-6AKS PLH-3AKH.UK PLH-4AKHS.UK PLH-5AKHS.UK PLH-6AKHS.UK w The part name of PLH-3AKH .UK PLH-4AKHS .UK PLH-5AKHS .UK PLH-6AKHS symbol “I.B” is “SPCB”. NAME SYMBOL NAME SYMBOL NAME SYMBOL INDOOR POWER BOARD...

  • Page 27: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit : mm PLH-3AK.UK PLH-3AK .UK / PUH-3VKA .UK PUH-3YKA Refrigerant flow in cooling Refrigerant flow in heating PLH-3AKH.UK PLH-3AKH .UK / PUH-3VKA .UK PUH-3YKA <R.V.coil> High pressure Oil separator Heating ON control switch Refrigerant pipe Outdoor unit...

  • Page 28: 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 29 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 Allowance cancel 3-minute time delay 6-minute Allowance time delay period...
  • Page 30 DRY OPERATION operation Four-way valve / OFF Initial dry operation Vane Vane initial setting setting notch Room temperature is 18°C 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 31 HEATING OPERATION Heat operation w 11 w 15 PLH-AKH initial Type Heating area HEATING 3-minute Defrost release Vane setting notch Vane initial setting Auxiliary heater Defrost 30 min. elapse Pipe defrosting temperature thermistor is 60°C Outdoor unit trouble or higher Four-way valve ON FAN speed Low notch...

  • Page 32: Microprocessor Control

    MICROPROCESSOR CONTROL 1. OUTLINE OF MICROPROCESSOR CONTROL Remote controller board INPUT to remote controller OUTPUT to remote controller Processes and transmits OFF-ON switching. Remote controller orders. COOL/DRY-AUTO-HEAT selector switching. LCD indicator Thermostat setting. TIMER mode selector-switching and Timer setting. HIGH-LOW fan speed switching. FILTER CHECK MODE AUTO Vane selector (AIR DISCHARGE)
  • Page 33 ON/OFF 3 Press the TEMP. button to set the desired temperature. NOTE: Set temperature changes 1°C when the button is pressed one time. Cooling 19 to 30°C WIRED REMOTE PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH CONTROLLER PLH-4, 5, 6AKS.UK PLH-4, 5, 6AKS PLH-4, 5, 6AKHS PLH-4, 5, 6AKHS.UK...
  • Page 34 5 Coil frost protection When the pipe temperature becomes -15°C 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 pipe temperature has been -15°C or below for 3 minutes,the coil frost protection will start. <Coil frost protection>...
  • Page 35 (4) Detecting abnormalities in the outdoor unit After the compressor has been continuously operated for 3 minutes, if the difference between the pipe 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 differ- ence is still out of RANGE C,the outdoor unit is functioning abnormally.
  • Page 36 3 Press the TEMP. button to set the desired temperature. NOTE: The set temperature changes 1°C when the button is pressed one time. Dry 19 to 30°C WIRED REMOTE PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH CONTROLLER PLH-4, 5, 6AKS.UK PLH-4, 5, 6AKS PLH-4, 5, 6AKHS PLH-4, 5, 6AKHS.UK...
  • Page 37 3The compressor will not start when the room temperature is below 18°C. The compressor starts intermittent operation when the power is turned ON with room temperature above 18°C. The com- pressor ON/OFF time depends on the thermostat ON/OFF and the following room temperatures.After 3-minute compres- sor operation, If the room temperature thermistor reads above 28°C with thermostat ON, the compressor will operate for 6 more min- utes and then stop for 3 minutes.
  • Page 38 NOTE: The set temperature changes 1°C when the button is pressed one time. Heating 17 to 28°C <Display in HEAT operation> [DEFROST] WIRED REMOTE PLH-3AK PLH-3AK.UK The [DEFROST] symbol is only displayed during the defrost operation. PLH-3AKH.UK PLH-3AKH CONTROLLER [STANDBY] PLH-4, 5, 6AKS.UK PLH-4, 5, 6AKS PLH-4, 5, 6AKHS.UK...
  • Page 39 (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 40 (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 pipe temperature and room temperature is in the RANGE B, the indoor fan will stop.
  • Page 41 Automatic 19 to 28°C “AUTOMATIC” works to change by itself the operation mode either to cooling or heating according to the room WIRED REMOTE temperature. PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH CONTROLLER PLH-4, 5, 6AKS.UK PLH-4, 5, 6AKS PLH-4, 5, 6AKHS.UK...
  • Page 42 CHECK MODE TEMP. To change the air flow direction, press button. TEST RUN ON/OFF 30° 45° 55° 70° WIRED REMOTE PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH CONTROLLER PLH-4, 5, 6AKS.UK PLH-4, 5, 6AKS PLH-4, 5, 6AKHS.UK PLH-4, 5, 6AKHS WIRELESS REMOTE CONTROLLER 30°...
  • Page 43 This setting will stop the air conditioner in 8 hours. With the lapse of time, time display changes in 1 hour units, showing remaining time. (2) WIRELESS REMOTE CONTROLLER PLH-3AK.UK PLH-4, 5, 6AKS.UK PLH-3AKH.UK PLH-4, 5, 6AKHS.UK <How to operate>...
  • Page 44 RUN at cooling operation. When a TEST RUN is started,the timer shall be set to 2 hours. The unit will automatically turn off after 2 hours. (2) WIRELESS REMOTE CONTROLLER PLH-3AK.UK PLH-4, 5, 6AKS.UK PLH-3AKH.UK PLH-4, 5, 6AKHS.UK <Before test run>...
  • Page 45 PLH-3AK PLH-4, 5, 6AKS <Before test run> PLH-3AKH .UK PLH-4, 5, 6AKHS Measure an impedance between the power supply terminal block on the outdoor unit and the ground with a 500 V Megger and check that it is equal or greater than 1.0M" " . 1 Turn on the main power to the unit.
  • Page 46 (1) Pipe temperature code During the test run, the pipe temperature code from 1 to 15 is displayed on the remote controller instead of room tem- perature. The code should fall with the lapse of time in normal COOL operation, and should rise in normal HEAT opera- tion.
  • Page 47 2-9 Interlock with ventilation system (LOSSNAY) Mr. SLIM/LOSSNAY interlock operation is available by using the optional parts listed below. (1) System organization Relay box (PZ-12RB-E) Relay box Mr. SLIM LOSSNAY Power supply LOSSNAY Mr. SLIM Power supply Remote display Remote adapter controller Remote...
  • Page 48 2-10 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 49 (3) SW3 (Emergency operation switch) Normal operation For emergency cooling For emergency heating (4) SW5 (Model selector) 1 2 3 4 SW5-1) Not yet used SW5-2) OFF:For models with heat pump ON :For models with cooling only SW5-3) OFF:Auto vane angle 30˚ 45˚ 55˚ 70˚ ON :Auto vane angle 25˚...
  • Page 50 3. OUTDOOR UNIT CONTROL 3-1 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 tempera- ture.
  • Page 51 3-5 Defrosting in HEAT mode <Defrosting time chart> Defrosting Defrosting starts. stops. Indoor unit Indoor fan Auto vane Set direction Set direction Outdoor unit 4-way valve Bypass valve Outdoor fan Compressor (1) Start conditions A. When all of the following conditions are satisfied, defrosting will start. However, when the bypass valve turns OFF, defrosting starts 10 minutes later.
  • Page 52 (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. Defrosting operation time Next defrost interval 3 minutes or below 120 minutes 3 to 7 minutes 80 minutes...
  • Page 53 3-7 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 : The outdoor coil thermistor reads 8°C or below.

  • Page 54: 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 dose not disap- 2) Timer adapter is connected to the 2) Make sure the timer adapter is used correctly.
  • Page 55 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 56 (WIRELESS REMOTE CONTROLLER) PLH-3AK.UK PLH-4, 5, 6AKS.UK PLH-3AKH.UK PLH-4, 5, 6AKHS.UK Remove the battery cover on the back side of (1) Turn on the main power of the unit. the wireless remote controller, display will start (2) Set the adjusting switch on the back of the flashing when the “Set”...
  • Page 57 (WIRELESS REMOTE CONTROLLER) PLH-3AK PLH-4, 5, 6AKS PLH-3AKH .UK PLH-4, 5, 6AKHS 1 Turn on the main power to the unit. CHECK 2 Press the button twice continuously. • begins to light and refrigerant address display “00” begins to bink. •...
  • Page 58 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 “EO” is (Indoor controller does not wire still indicated, replace the indoor controller respond to remote controller 2) Signal transmitting/receiving cir- board.
  • Page 59 3. 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.
  • Page 60 3-1 Outdoor coil temperature To obtain data on the outdoor coil temperature, add the number of bits of lighting LEDs, and see the graph below to find the temperature. Short Open Number of bits 3-2 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.
  • Page 61 3-3 Total time of compressor operation Compressor operation time is indicated in every accumulated-256-hour. To obtain the compressor operation time, add the hours of lighting LEDs. During the compressor operation time indication, SW2 is not available. 3-4 Check code indication When a protection function works for the first time during operation, the operation stops and restarts after the 3-minutes time delay mode.
  • Page 62 6. WRONG WIRING ON SITE 6-1 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. 6-2 Phenomenon due to wrong wiring between indoor and outdoor units Wrong Wiring Mode...
  • Page 63 7. 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 64 9. HOW TO CHECK THE PARTS PLH-3AK.UK PLH-4AKS.UK PLH-5AKS.UK PLH-6AKS.UK PLH-3AK PLH-4AKS PLH-5AKS PLH-6AKS PLH-3AKH.UK PLH-4AKHS.UK PLH-5AKHS.UK PLH-6AKHS.UK PLH-3AKH .UK PLH-4AKHS .UK PLH-5AKHS .UK PLH-6AKHS Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester.
  • Page 65 <Thermistor Characteristic graph> < Thermistor for lower temperature > Room temperature thermistor(RT1) Thermistor for Pipe temperature thermistor(RT2) lower temperature Thermistor R =15k' ± 3% Fixed number of B=3480K ± 2% Rt=15exp { 3480( 273+t 15k' 9.6k' 6.3k' -20 -10 0 10 20 30 40 50 5.2k' Temperature (:)

  • Page 66: Way Air Flow System

    4-WAY AIR FLOW SYSTEM 1. Placement of the air outlets For this grille, the blowout direction comes in 11 patterns. Also, by setting the dip switches (SW8-3, SW8-4) on the indoor board to the appropriate settings, you can adjust the air flow and speed.
  • Page 67 3. Fixing of horizontal vane Horizontal vane of each air outlet can be fixed according to the environment, in which it is installed. Setting procedure 1) Turn off the main power supply (Turn off the breaker). 2) Disconnect the vane motor connector of the direction of the arrow by pressing the unlocking button as shown in the figure below.) Electrically insulate the disconnected connector with vinyl tape.
  • Page 68 4. Fresh air intake amount & static pressure characteristics (1) PLH-3AK.UK PLH-3AKH.UK PLH-3AK PLH-3AKH Multifunction casement + Standard filter Multifunction casement + High efficiency filter Static pressure [Pa] Static pressure [Pa] Air flow [m /min] Air flow [m /min] 2 intakes...
  • Page 69 5. Interlocking operation method with duct fan (Booster fan) Whenever the indoor unit is operating, the duct fun Be sure to secure insulation operates. material by tape etc. Green CN51 (1)Connect the optional multiple remote controller adapter(PAC-SA88HA-E)to the connector CN51 on Yellow indoor unit the indoor controller board.
  • Page 70 7. Air flow & Static pressure characteristics of Branch Duct (with SWA at “Standard”) 4 direction airflow (Horizontal vane) Round duct Rectangular duct PLH-3AK.UK PLH-3AKH.UK PLH-3AK.UK PLH-3AKH.UK PLH-3AK .UK PLH-3AKH PLH-3AK .UK PLH-3AKH Static Static pressure pressure [Pa] [Pa] Air flow [m...
  • Page 71 2 direction airflow (Horizontal vane) Round duct Rectangular duct PLH-3AK.UK PLH-3AKH.UK PLH-3AK.UK PLH-3AKH.UK PLH-3AK .UK PLH-3AKH PLH-3AK .UK PLH-3AKH Static Static pressure pressure [Pa] [Pa] 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7...

  • Page 72: 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 73.)
  • Page 73 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 74 3. CONTROL USING TWO REMOTE CONTROLLERS : OPTIONAL REMOTE CONTROLLER (PAR-JA240KA) 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”...
  • Page 75 NOTE1 : Install the relay box where you can be serviced it 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 220/240V AC, Do not connect the control circuit wire to the remote controller cable directly.
  • Page 76 6. MULTIPLE REMOTE CONTROL DISPLAY Indoor controller board You can control several units with a multiple remote control display, by Indoor controller board wiring an optional multiple display adapter (PAC-SA88HA-E) with relays and lamps on the market. 6-1 How to wire (1) Connect the multiple display adapter to the connector CN51 on the indoor controller board.

  • Page 77: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLH-3AK.UK Be careful on removing heavy parts. PLH-3AK OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the air intake grille Figure 1 (1) Slide the knob of air intake grille toward the arrow 1 to open the air intake grille.
  • Page 78 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 5. Remove the fan motor Photo 4 (1) Remove the fan guard.(See photo 1) Fan motor (2) Remove the bell mouth.(See photo 2) (3) Remove the electrical box.(See photo 3) (4) Remove the turbo fan nut. (5) Pull out the turbo fan.
  • Page 79 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 9. Removing the drain pump and drain sensor Photo 8 (1) Remove the panel. (See photo 6) (2) Remove the fan guard. (See photo 1) (3) Remove the bell mouth. (See photo 2) (4) Remove the electrical box. (See photo 3) (5) Remove the drain pan.

  • Page 80: Parts List

    PARTS LIST PANEL PARTS PLH-3AK.UK PLH-4AKS.UK PLH-5AKS.UK PLH-6AKS.UK PLH-3AK PLH-4AKS PLH-5AKS PLH-6AKS PLH-3AKH.UK PLH-4AKHS.UK PLH-5AKHS.UK PLH-6AKHS.UK PLH-3AKH .UK PLH-4AKHS .UK PLH-5AKHS .UK PLH-6AKHS CHECK TEST RUN MODEL SELECT ˚C AMPM AMPM NOT AVAILABLE ON/OFF TEMP ON/OFF PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH PLH-4,5,6AKS.UK...
  • Page 81 FUNCTIONAL PARTS PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH PLH-4AKS.UK PLH-4AKS PLH-4AKHS.UK PLH-4AKHS Q'ty / set Price PLH-3 PLH-4 Wiring Recom- Remarks Specification Parts No. Parts Name Diagram mended AKHS (Drawing No.) Symbol Q'ty AKHS Unit Amount S70 E06 762 FAN MOTOR D17B6P70MS...
  • Page 82 FUNCTIONAL PARTS PLH-5AKS.UK PLH-5AKS PLH-5AKHS.UK PLH-5AKHS PLH-6AKS.UK PLH-6AKS PLH-6AKHS.UK PLH-6AKHS Q'ty / set Price PLH-5 PLH-6 Wiring Recom- Remarks Specification Parts No. Parts Name Diagram AKHS AKHS mended (Drawing No.) AKHS AKHS Symbol Q'ty Unit Amount S70 E07 762 D176P120MS FAN MOTOR S70 E01 114 TURBO FAN...
  • Page 83 FUNCTIONAL PARTS PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH PLH-4AKS.UK PLH-4AKS PLH-4AKHS.UK PLH-4AKHS Part numbers that is circled is not shown in the figure. Q'ty / set Price PLH-3 PLH-4 Wiring Recom- Remarks Parts No. Parts Name Specification Diagram AKHS mended (Drawing No.)
  • Page 84 FUNCTIONAL PARTS PLH-5AKS.UK PLH-5AKS PLH-5AKHS.UK PLH-5AKHS PLH-6AKS.UK PLH-6AKS PLH-6AKHS.UK PLH-6AKHS Part numbers that is circled is not shown in the figure. Q'ty / set Price PLH-5 PLH-6 Wiring Recom- Remarks Parts No. Parts Name Specification Diagram AKHS AKHS mended (Drawing No.) Symbol AKHS AKHS...

  • Page 85: Optional Parts

    OPTIONAL PARTS 1. REFRIGERANT PIPES Service Ref. : PLH-3AK.UK PLH-3AK PLH-3AKH.UK PLH-3AKH Part No. PAC-05FFS-E PAC-07FFS-E PAC-10FFS-E PAC-15FFS-E Pipe length Pipe size O.D . Liquid:[9.52 Gas:[15.88 Connection method Indoor unit: Flared Outdoor unit: Flared Service Ref. : PLH-4AKS.UK, PLH-5AKS.UK, PLH-6AKS.UK PLH-4AKS .UK, PLH-5AKS...
  • Page 86 2-3 How to connect program timer (1) Install the program timer next to the remote controller the same way as the remote controller is installed. (2) Connect the program timer and the remote controller with a 5-wire cable as shown in the figure below Connect to indoor unit NOTE:While the program timer is connected to the remote controller, the 2-wire cable...
  • Page 87 DUAL D U A L C E N T R A L O P E R A T I O N CENTRAL MITSUBISHI ELECTRIC 10 9 8 7 6 5 4 3 2 1 1 1 7 5-2 Functions POWER ON/OFF switch Operation ON/OFF switch.
  • Page 88 5-3 Connection method (1) Connections in the power supply cord. 1. Connect the power supply cord to the power supply terminal-block and fix it in-place with a tie-wrap. Connect a single phase 200V AC (220, 230, 240V) to is the GND terminal, be sure to ground the earth wire. 2.
  • Page 89 6. PROGRAM TIMER ADAPTER This adapter is needed when a program timer(PAC-SC32PTA)or a centralized remote controller(PAC-805RC)is used. Part No. PAC-825AD 6-1 Parts included 1 ADAPTER ·························1P 2 3-core cable···························1P 3 3-core cable···························1P Length : 2m (6' 7") Length : 2m (6' 7") 4 4-core cable···························1P 5 5-core cable···························1P Length : 2m (6' 7")
  • Page 90 PAC-SG06SP-E Applicable Service Ref. PLH-3/4/5/6AK(H)(S).UK PLH-3/4/5/6AK(H)(S) HEAD OFFICE : MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN © Copyright 2000 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD. Distributed in Sep. 2004 No. OC211 REVISED EDITION-A PDF 9 Issued in Aug. 2000 No. OC211 550 New publication, effective Sep.

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