SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS November 2012 No. OCH412 REVISED EDITION-F SERVICE MANUAL Indoor unit [Model names] PLA-RP35BA Revision: • PLA-RP35/50/60/71BAR3.UK PLA-RP50BA have been added in REVISED EDITION-F. PLA-RP60BA • Some descriptions have been modified. PLA-RP71BA • Please void OCH412 PLA-RP100BA REVISED EDITION-E.
SAFETY PRECAUTION 3-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 3-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R410A Use new refrigerant pipes. Do not use refrigerant other than R410A. In case of using the existing pipes for R22, be careful with If other refrigerant (R22 etc.) is used, chlorine in refrige- the followings.
[2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A on the market is syphon type. · Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant.
4-2. WIRELESS REMOTE CONTROLLER CHECK TEST RUN display CHECK and TEST RUN display indicate that the unit is being checked or test-run. MODEL SELECT display Blinks when model is selected. display Lights up while the signal is transmitted to the indoor unit when the button is pressed. display SET TEMP.
Page 7
4-3. WIRED REMOTE CONTROLLER <PAR-30MAA/PAR-31MAA> Wired remote controller function * The functions which can be used are restricted according to the model. : Supported : Unsupported PAR-30MAA/PAR-31MAA Function PAR-21MAA Slim City multi Body Product size H × W × D (mm) 120 ×...
Page 8
The main display can be displayed in two different modes: "Full" and "Basic". The factory setting is "Full". To switch to the "Basic" mode, change the setting on the Main display setting. <Full mode> <Basic mode> * All icons are displayed for explanation. Cool Set temp.
Page 9
Menu structure Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the SELECT button. Vane · Louver · Vent. (Lossnay) High power Timer On / Off timer Auto-Off timer Filter information Error information Weekly timer Energy saving...
Page 10
Main menu list Setting and display items Setting details Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting from fi ve different settings. Use to turn ON / OFF the louver. •...
Page 11
Setting and display items Setting details Initial setting Display Make the settings for the remote controller related items as necessary. details Clock: The factory settings are "Yes" and "24h" format. Temperature: Set either Celsius (°C) or Fahrenheit (°F). Room temp. : Set Show or Hide. Auto mode: Set the Auto mode display or Only Auto display.
4-4. WIRED REMOTE CONTROLLER <PAR-21MAA> “Sensor” indication Display Section Displayed when the remote controller sensor is used. Day-of-Week For purposes of this explanation, Shows the current day of the week. all parts of the display are shown. During actual operation, only Time/Timer Display the relevant items will be lit.
TROUBLESHOOTING 10-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit. Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents below before investigating details.
Page 24
10-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER <In case of trouble during operation> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> [Procedure] 1.
Page 25
• Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp flash pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
Page 26
• On wireless remote controller The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp • On wired remote controller Check code displayed in the LCD. • If the unit cannot be operated properly after test run, refer to the following table to find the cause. Symptom Cause Wired remote controller...
Note: Refer to the manual of outdoor unit for the details of display 10-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause Room temperature thermistor (TH1) Defective thermistor – Check resistance value of thermistor.
Page 28
Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) operating Clogged filter (reduced airflow) Check clogs of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove blockage. The unit is in 6-minute resume Low-load (low temperature) prevention mode if pipe <liquid or...
Page 29
Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor Pipe temperature thermistor/ 1–3 Check resistance value of thermistor. Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. 1 The unit is in 3-minute resume protection 2 Contact failure of connector 2 Check contact failure of connector (CN44) mode if short/open of thermistor is (CN44) on the indoor controller...
Page 30
Abnormal point and detection method Countermeasure Error Code Cause 1 Contact failure, short circuit or, Indoor/outdoor unit communication * Check LED display on the outdoor control error (Signal receiving error) circuit board. (Connect A-control service miswiring (converse wiring) of 1 Abnormal if indoor controller board indoor/outdoor unit connecting tool, PAC-SK52ST.) cannot receive any signal normally for 6...
Page 31
Abnormal point and detection method Countermeasure Error Code Cause Abnormal refrigerant circuit 1 When this error occurs, be sure to replace 1 Abnormal operation of 4-way During Cooling, Dry, or Auto Cooling the 4-way valve. valve operation, when the following are 2 Check refrigerant pipes for disconnection or 2 Disconnection of or leakage in regarded as failures when detected for...
10-4. TROUBLESHOOTING OF PROBLEMS Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1)LED2 on indoor controller board • When LED1 on indoor controller board is also off. is off. 1 Power supply of rated voltage is not supplied to out- 1 Check the voltage of outdoor power door unit.
Page 33
Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (2) LED2 on indoor controller board • When LED1 on indoor controller board is also blinking. Check indoor/outdoor unit connecting wire is blinking. Connection failure of indoor/outdoor unit connecting for connection failure.
10-5. EMERGENCY OPERATION 10-5-1. When wireless remote controller fails or its battery is exhausted When the remote controller cannot be used When the batteries of the remote controller run out or the remote control- ler malfunctions, the emergency operation can be done using the emer- gency buttons on the grille.
10-6. HOW TO CHECK THE PARTS PLA-RP35/50/60/71/100/125/140BA.UK PLA-RP35/50/60/71BA PLA-RP35/50/60/71/100/125/140BA#2.UK PLA-RP35/50/60/71BAR3.UK PLA-RP71/100/125/140BA2.UK Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature of 10 - 30 ) Pipe temperature Normal Abnormal thermistor/liquid(TH2)
Page 36
10-6-1. Thermistor < Thermistor for lower temperature > <Thermistor Characteristic graph> Room temperature thermistor (TH1) Thermistor for Pipe temperature thermistor/liquid (TH2) lower temperature Condenser/evaporator temperature thermistor (TH5) Thermistor R =15k' ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+t 15k' 9.6k'...
Page 37
10-7. TEST POINT DIAGRAM Indoor controller board PLA-RP35/50/60/71/100/125/140BA.UK PLA-RP35/50/60/71BA PLA-RP30/50/60/71/100/125/140BA#2.UK PLA-RP35/50/60/71BAR3.UK PLA-RP71/100/125/140BA2.UK CN3G Connect to the auto grille LED3 Vane motor output (MV) controller board (CN3G) Transmission (Indoor/outdoor) 12V pulse output 13V pulse output CN90 Connect to the wireless CN2L remote controller board Connector (LOSSNAY) (CNB)
Page 38
10-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control P.C. board. The black square (■) indicates a switch position Jumper wire ( : Short : Open) Jumper wire Setting by the dip switch and jumper wire Functions Remarks...
SPECIAL FUNCTION 11-1. HOW TO PERFORM THE UP/DOWN OPERATION OF THE AIR INTAKE GRILLE 11-1-1. Setting up the lowering distance of air intake grille Unit You can set up 8 different stages of lowering distance for Decorative the air intake grille according to the set up location if desired. panel * As a factory default, the decorative panel will automatically stop at 1.6 m from the ceiling surface.
Page 40
11-1-3. How to perform the up/down operation using wired remote controller (PAR-30MAA / PAR-31MAA) Maintenance menu Select "Maintenance" from the Main menu, and press the button. Auto descending panel Manual vane angle Select "Auto descending panel" with the F1 or F2 button, and press the button.
Page 41
11-1-4. How to perform the up/down operation using wired remote controller (PAR-21MAA) ■General Operation * Raise or lower all the air intake grilles managed by the remote controller at the same time. Install the remote controller in a place where you can observe all the air-conditioners. Otherwise, the lowering grille may make contact with something and cause damage to it.
Page 42
■ Up/down operation with the individual specified air-conditioner (when used in combination with Mr. SLIM model) * Raise or lower the air intake grille of the specific air-conditioner that you select from all that are managed by that remote controller. 1) Ensure that the air-conditioner is not running.
Page 43
11-2. OPERATION (AUTO DESCENDING PANEL: PLP-6BAJ) (1) Normal operation UP/DOWN Wire 1b Air intake grille is raised/lowered by UP/DOWN UP/DOWN commands of UP and DOWN. Machine 2 Machine 1 Air intake grille does not move under the state of no-load detection or obstacle detection. Air intake grille stops automatically at the set lowering distance from the ceiling level.
Page 45
11-3-3. Check point of trouble <LED (SW22 type) /LED2 (SW2 type) display> Turn OFF : No power supply Blink : Storage detection switch ON (short) One blink : Storage detection switch OFF (open) Two blinks : Tension detection switch OFF (open) <controller board>...
11-5. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) 11-5-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub unit operate alternately according to the interval of rotation setting. * Main and sub unit should be set by refrigerant address. (Outdoor Dip switch setting) Refrigerant address "00"...
Page 47
• System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 20°C [2nd stage cut-in function]··· Request code number "322~324" Set point = 26°C When request code number is “323”. Room temp. Set point Room temp.
Page 48
(2) Setting method of each function by wired remote controller PAR-30MAA/PAR-31MAA Press the button. Main Main menu Maintenance Initial setting Select "Service" with the [Cursor] buttons ( ) or the [Page] buttons ( Service ), and press the button. Main display: Cursor Page Enter the current maintenance password (4 numerical digits).
DISASSEMBLY PROCEDURE PLA-RP35/50/60/71/100/125/140BA.UK PLA-RP35/50/60/71BA PLA-RP35/50/60/71/100/125/140BA#2.UK PLA-RP35/50/60/71BAR3.UK PLA-RP71/100/125/140BA2.UK Be careful when removing heavy parts. 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 Filter open the air intake grille.
Page 50
OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Coil plate Photo 3 6. Removing the fan and fan motor (MF) (1) Remove the electrical box. (See Photo 2) (2) Remove the bell mouth (3 screws). (See Photo 2) (3) Remove the turbo fan nut. (4) Pull out the turbo fan.
Page 51
OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 8 10. Removing the drain pump (DP) and float switch (FS) (1) Remove the drain pan. (See Photo 6) Float switch (2) Cut the hose band and remove the hose. (3) Remove the drain pump assembly (3 screws and 2 hooks). Hose band (4) Remove the drain pump (3 screws).
Page 52
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2007 MITSUBISHI ELECTRIC CORPORATION Distributed in Nov. 2012 No.OCH412 REVISED EDITION-F Distributed in Aug. 2009 No.OCH412 REVISED EDITION-E PDF 6 Distributed in Mar. 2009 No.OCH412 REVISED EDITION-D PDF 6 Distributed in Apr.