Mitsubishi Electric PKA-A12GA User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES .....................................2
2. REFERENCE MANUAL ......................................2
3. SAFETY PRECAUTION ......................................3
4. PART NAMES AND FUNCTIONS.......................5
5. SPECIFICATIONS ...............................................9
6. NOISE CRITERION CURVES........................... 11
7. OUTLINES AND DIMENSIONS ........................ 12
8. WIRING DIAGRAM............................................ 15
9. REFRIGERANT SYSTEM DIAGRAM
.................
19
10. TROUBLE SHOOTING......................................20
11. SPECIAL FUNCTION......................................... 35
12. DISASSEMBLY PROCEDURE..........................38
13. RoHS PARTS LIST............................................44
Indoor unit
[Model names]
PKA-A12GA
PKA-A18GA
PKA-A24FA
PKA-A30FA
PKA-A36FA
PKA-A12GAL
PKA-A18GAL
PKA-A24FAL
PKA-A30FAL
PKA-A36FAL
INDOOR UNIT
No.OC369
REVISED EDITION-E
WIRELESS REMOTE
CONTROLLER
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
Model name indication
March 2013
ON/OFF
TEMP.
WIRED REMOTE
CONTROLLER
PKA-A12GA PKA-A18GA
PKA-A12GAL PKA-A18GAL
NOTE:
• This manual describes only
service data of the indoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
• For servicing RoHS compli-
ant products, refer to the
RoHS PARTS LIST.
• Please void OC369
REVISED EDTION-D.
[Service Ref.]
PKA-A12GA PKA-A12GA1PKA-A12GA2
PKA-A18GA PKA-A18GA1PKA-A18GA2
PKA-A24FA PKA-A24FA1PKA-A24FA2
PKA-A30FA PKA-A30FA1PKA-A30FA2
PKA-A36FA PKA-A36FA1PKA-A36FA2
PKA-A12GAL PKA-A12GAL1PKA-A12GAL2
PKA-A18GAL PKA-A18GAL1PKA-A18GAL2
PKA-A24FAL PKA-A24FAL1PKA-A24FAL2
PKA-A30FAL PKA-A30FAL1PKA-A30FAL2
PKA-A36FAL PKA-A36FAL1PKA-A36FAL2
Revision:
• The indicated No. of
CORNER COVER (page
50) in the illustration have
been corrected in REVISED
EDITION-E.

2
1 TECHNICAL CHANGES
2REFERENCE MANUAL
Service Ref.
PUZ-A18/24/30/36/42NHA
PUZ-A18/24/30/36/42NHA-BS
PUY-A12/18/24/30/36/42NHA(1)
PUY-A12/18/24/30/36/42NHA(1)-BS
Service Manual No.
OC367
PUZ-HA36NHA OCH426
OCB426
2-1. OUTDOOR UNIT SERVICE MANUAL
Series (Outdoor unit)
PUZ-A·NHA(-BS)
PUY-A·NHA(-BS)
Data Book No.
OCS04
PUZ-HA36NHA OCS12
2-2. TECHNICAL DATA BOOK
PKA-A12GA1PKA-A12GA2
PKA-A18GA1PKA-A18GA2
PKA-A24FA1PKA-A24FA2
PKA-A30FA1PKA-A30FA2
PKA-A36FA1PKA-A36FA2
PKA-A12GAL1PKA-A12GAL2
PKA-A18GAL1PKA-A18GAL2
PKA-A24FAL1PKA-A24FAL2
PKA-A30FAL1PKA-A30FAL2
PKA-A36FAL1PKA-A36FAL2
• Indoor controller board (I.B) has been changed (11. SPECIAL FUNCTION is added).
PKA-A12GA PKA-A12GA1
PKA-A18GA PKA-A18GA1
PKA-A24FA PKA-A24FA1
PKA-A30FA PKA-A30FA1
PKA-A36FA PKA-A36FA1
PKA-A12GAL PKA-A12GAL1
PKA-A18GAL PKA-A18GAL1
PKA-A24FAL PKA-A24FAL1
PKA-A30FAL PKA-A30FAL1
PKA-A36FAL PKA-A36FAL1
• Indoor controller board (I.B) has been changed.
OC369E

3
Cautions for units utilizing refrigerant R410A
3-2. CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant 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.
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
compressor.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
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.
The refrigerant oil applied to flares and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
[1] Cautions for service
(1) Perform service after recovering 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.
3SAFETY PRECAUTION
3-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminals, all supply
circuits must be disconnected.
OC369E

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.)
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 —
OC369E

5
4PART NAMES AND FUNCTIONS
Indoor Unit
Air intake Air intake grille
Filter
Air outlet
Guide vane
Auto vane
PKA-A12GA
PKA-A18GA
PKA-A12GAL
PKA-A18GAL
PKA-A12GA1
PKA-A18GA1
PKA-A12GAL1
PKA-A18GAL1
PKA-A12GA2
PKA-A18GA2
PKA-A12GAL2
PKA-A18GAL2
Indoor Unit
PKA-A24FA
PKA-A30FA
PKA-A36FA
PKA-A24FAL
PKA-A30FAL
PKA-A36FAL
PKA-A24FA1
PKA-A30FA1
PKA-A36FA1
PKA-A24FAL1
PKA-A30FAL1
PKA-A36FAL1
PKA-A24FA2
PKA-A30FA2
PKA-A36FA2
PKA-A24FAL2
PKA-A30FAL2
PKA-A36FAL2
Guide vane
Air intake
Filter Air intake grille
Air outlet Air outlet
Auto vane
Room air is suctioned
here.
Removes dust and dirt
from the intake air.
Airflow can be changed
to horizontally by moving
the guide vane to the left
or right.
Disperse airflow up and
down as well as adjusts the
angle of airflow direction.
OC369E