Mitsubishi Electric Mr. Slim PCA Series User manual

SERVICE MANUAL
No. OCH492
INDOOR UNIT
REMOTE CONTROLLER
(Option)
[Service Ref.]
PCA-RP71HAQ
PCA-RP125HAQ
CONTENTS
1. REFERENCE MANUAL................................... 2
2. SAFETY PRECAUTION................................... 3
3. PART NAMES AND FUNCTIONS.................... 7
4. SPECIFICATIONS............................................ 9
5. NOISE CRITERION CURVES........................10
6. OUTLINES AND DIMENSIONS......................11
7. WIRING DIAGRAM
.............................................
13
8. REFRIGERANT SYSTEM DIAGRAM
............. 14
9. TROUBLESHOOTING....................................15
10. SPECIAL FUNCTION.....................................26
11. DISASSEMBLY PROCEDURE.......................29
ON/OFF
TEMP.
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
December 2010
Model name
indication
Note:
•This manual describes only
service data of the indoor units.
•RoHS compliant products have
<G> mark on the spec name
plate.
•For servicing of RoHS com-
pliant products, refer to the
RoHS Parts List.
Indoor unit
[Model names]
PCA-RP71HAQ
PCA-RP125HAQ
PARTS CATALOG (OCB492)

2
1-1. OUTDOOR UNIT’S SERVICE MANUAL
1-2. TECHNICAL DATA BOOK
1REFERENCE MANUAL
Note:
The phrase “Wired remote controller” in this service manual refers only to the PAR-21MAA.
If you need any information for the PAR-30MAA, please refer to the instruction book included in PAR-30MAA box.
Service Ref. Service Manual No.
PUHZ-RP71VHA4
PUHZ-RP125/140VKA
PUHZ-RP125/140/250YKA
OCH451
OCB451
PU(H)-P71VHAR3.UK
PU(H)-P71/125/140YHAR3.UK OC379
PUHZ-P125/140VHA3R2.UK
PUHZ-P125/140YHAR1.UK OCH415 / OCB415
PUHZ-P250YHA3R2 OCH424 / OCB424
Series (Outdoor unit) Manual No.
PUHZ-RP • HA4
PUHZ-RP • KA OCS16
PUHZ-P • VHA3
PUHZ-P • YHAR3 OCS17

33
SAFETY PRECAUTION
2
Cautions for units utilising refrigerant R407C
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Do not use the existing refrigerant piping.
The old refrigerant and lubricant in the existing piping
contains a large amount of chlorine which may cause the
lubricant deterioration of the new unit.
Use “low residual oil piping”
If there is a large amount of residual oil (hydraulic oil, etc.)
inside the piping and joints, deterioration of the lubricant
will result.
If large amount of mineral oil enter, that can cause
deterioration of refrigerant oil etc.
Use liquid refrigerant to charge the system.
If gas refrigerant is used to seal the system, the composition
of the refrigerant in the cylinder will change and performance
may drop.
Do not use a refrigerant other than R407C.
If another refrigerant (R22, etc.) is used, the chlorine in the
refrigerant may cause the lubricant deterioration.
Use a vacuum pump with a reverse flow check valve.
The vacuum pump oil may flow back into the refrigerant
cycle and cause the lubricant deterioration.
If dust, dirt, or water enters the refrigerant cycle,
deterioration of the oil and compressor trouble may result.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Store the piping to be used indoors during
installation, and keep both ends of the piping
sealed until just before brazing. (Leave elbow
joints, etc. in their packaging.)
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply
circuits must be disconnected.

4
[3] Service tools
Use the below service tools as exclusive tools for R407C refrigerant.
[2] Refrigerant recharging
(1) Refrigerant recharging process
1Direct charging from the cylinder.
· R407C cylinder are available on the market has a syphon pipe.
· Leave the syphon pipe cylinder standing and recharge it.
(By liquid refrigerant)
(2) Recharge in refrigerant leakage case
· After recovering the all refrigerant in the unit, proceed to working.
· Do not release the refrigerant in the air.
· After completing the repair service, recharge the cycle with the specified amount of liquid refrigerant.
Gravimeter
Unit
[1] Cautions for service
· After recovering the all refrigerant in the unit, proceed to working.
· Do not release refrigerant in the air.
· After completing the repair service, recharge the cycle with the specified amount of liquid refrigerant.
No. Tool name Specifications
1Gauge manifold · Only for R407C
· Use the existing fitting SPECIFICATIONS. (UNF7/16)
· Use high-tension side pressure of 3.43MPa·G or over.
2Charge hose · Only for R407C
· Use pressure performance of 5.10MPa·G or over.
3Electronic scale —
4Gas leak detector · Use the detector for R134a or R407C.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · For R407C · Top of cylinder (Brown)
· Cylinder with syphon
8Refrigerant recovery equipment —

5
Cautions for units utilising refrigerant R410A
CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
Store the piping to be used during installation
indoors, and keep both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
In case of using the existing pipes for R22, be careful with
the followings.
· For RP71VHA3 and RP125 be sure to perform
replacement operation before test run.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Keep the tools with care.
If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enter, that can cause deterio-
ration of refrigerant oil etc.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazards to refrigerant cycle.
In addition, use pipes with specified thickness.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
[1] Cautions for service
(1) Perform service after collecting the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[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.)