Mitsubishi Electric Mr. Slim PLA-A12BA4 User manual

SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
CONTENTS
1. REFERENCE MANUAL........................ 2
2. SAFETY PRECAUTION........................ 3
3. PART NAMES AND FUNCTIONS ........ 5
4. SPECIFICATIONS................................. 8
5. NOISE CRITERION CURVES............. 10
6. OUTLINES AND DIMENSIONS............12
7. WIRING DIAGRAM............................. 13
8. REFRIGERANT SYSTEM DIAGRAM
...... 14
9. TROUBLESHOOTING ........................ 15
10. SPECIAL FUNCTION ......................... 29
11. DISASSEMBLY PROCEDURE ........... 32
NOTE:
• This manual describes only
service data of the indoor units.
• RoHS compliant products have
<G> mark on the spec name
plate.
PARTS CATALOG (OCB482)
WIRED REMOTE
CONTROLLER
(Option)
IR WIRELESS REMOTE
CONTROLLER
(Option)
ON/OFF TEMP
ON/OFF
TEMP.
INDOOR UNIT
Model name
indication
No. OCH482
November 2010
PLA-A12BA4
PLA-A18BA4
PLA-A24BA4
PLA-A30BA4
PLA-A36BA4
PLA-A42BA4
PLA-A12BA4
PLA-A18BA4
PLA-A24BA4
PLA-A30BA4
PLA-A36BA4
PLA-A42BA4
Indoor unit
[Model names] [Service Ref.]
33223

2
1REFERENCE MANUAL
OUTDOOR UNIT SERVICE MANUAL
Model name Service Ref. Service Manual No.
PUZ-A18/24/30/36/42NHA4 PUZ-A18/24/30/36/42NHA4
OCH481
OCB481
PUZ-A18/24/30/36/42NHA4-BS PUZ-A18/24/30/36/42NHA4-BS
PUY-A12/18/24/30/36/42NHA4 PUY-A12/18/24/30/36/42NHA4
PUY-A12/18/24/30/36/42NHA4-BS PUY-A12/18/24/30/36/42NHA4-BS
Radio frequency interface Wired remote controller IR wireless remote controller
ON/OFF
TEMP.
COOL
DRY
AUTO
FAN
HEAT
RF thermostat
Remote controller (Optional parts)

3
SAFETY PRECAUTION
2
Cautions for units utilising refrigerant R410A
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
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.)
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.
Handle tools with care.
If dirt, dust or moisture enters 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 enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enters, 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 hazard 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.
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply
circuits must be disconnected.

4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A 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.)
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in the 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.
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09MPa·G or over.
3Electronic scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —

5
3PART NAMES AND FUNCTIONS
Drain pipe
Filter
Vane
Gas pipe
Liquid pipe
Air outlet
i-see sensor
(option)
Air intake
(Intake grille)