Mitsubishi Electric Mr.Slim PUHZ-P100VHA2 User manual

SERVICE MANUAL
No.OCH415
REVISED EDITION-C
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R410A
July 2009
PUHZ-P100VHA2.UK
PUHZ-P100VHA3.UK
CONTENTS
1. TECHNICAL CHANGES.................................2
2. REFERENCE MANUAL.................................. 2
3. SAFETY PRECAUTION..................................3
4. FEATURES...................................................... 6
5. SPECIFICATIONS...........................................7
6. DATA...............................................................8
7. OUTLINES AND DIMENSIONS....................11
8. WIRING DIAGRAM.......................................15
9. WIRING SPECIFICATIONS..........................16
10. REFRIGERANT SYSTEM DIAGRAM............... 21
11. TROUBLESHOOTING................................... 23
12. FUNCTION SETTING....................................73
13. EASY MAINTENANCE FUNCTION..............80
14. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER
...........83
15. DISASSEMBLY PROCEDURE..................... 93
PARTS CATALOG (OCB415)
Outdoor unit
[model names]
PUHZ-P100VHA2
PUHZ-P125VHA2
PUHZ-P140VHA2
PUHZ-P100VHA3
PUHZ-P125VHA3
PUHZ-P140VHA3
[Service Ref.]
PUHZ-P100VHA2.UK
PUHZ-P125VHA2.UK
PUHZ-P125VHA21.UK
PUHZ-P140VHA2.UK
PUHZ-P140VHA21.UK
PUHZ-P100VHA3.UK
PUHZ-P100VHA3R1.UK
PUHZ-P125VHA3.UK
PUHZ-P125VHA3R1.UK
PUHZ-P140VHA3.UK
PUHZ-P140VHA3R1.UK
Note:
•RoHS compliant products
have <G> mark on the
spec name plate.
Revision:
• PUHZ-P100/125/140
VHA3R1.UK are added in
REVISED EDITION-C.
• Some descriptions have
been modified.
• Please void OCH415
REVISED EDITION-B.

2
2REFERENCE MANUAL
Model name Service Ref.
Service
Manual No.
PLA-RP50/60/71/100/125/140BA
PLA-RP140BA2 PLA-RP50/60/71/100/125/140BA(#2).UK PLA-RP50/60/71BA1.UK
PLA-RP140BA2R1.UK OCH412
OCB412
PCA-RP71/125HA OC329 PCA-RP71/125HA(#1)
PCA-RP50/60/71/100/125/140GA PCA-RP50/60/71/100/125/140GA(#1) OC328
PCA-RP50GA2 PCA-RP50GA2(#1)
PKA-RP50GAL PKA-RP50GAL(#1) OC330
PKA-RP60/71/100FAL PKA-RP60/71/100FAL(#1)
PKA-RP50FAL2 PKA-RP50FAL2(#1) OC331
PEAD-RP60/71/100GA PEAD-RP60/71/100GA(#1).UK HWE0506
PEAD-RP50/60/71/125/140EA
PEAD-RP100EA2 PEAD-RP50/60/71/125/140EA(#1).UK PEAD-RP100EA2(#1).UK HWE0521
PKA-RP60/71/100KAL PKA-RP60/71/100KAL.TH OCH452
OCB452
PKA-RP35/50HAL PKA-RP35/50HAL
PCA-RP50/60/71/100/125/140KA PCA-RP50/60/71/100/125/140KA OCH454
OCB454
OCH453
OCB453
PEAD-RP35/50/60/71/100/125/140JA(L) PEAD-RP35/50/60/71/100/125/140JA(L).UK HWE08130
BWE08240
INDOOR UNIT’S SERVICE MANUAL
PUHZ-P125VHA2.UK PUHZ-P125VHA21.UK
PUHZ-P140VHA2.UK PUHZ-P140VHA21.UK
4-WAY VALVE and COIL (21S4) have been changed.
1TECHNICAL CHANGES
PUHZ-P100VHA2.UK PUHZ-P100VHA3.UK
PUHZ-P125VHA21.UK PUHZ-P125VHA3.UK
PUHZ-P140VHA21.UK PUHZ-P140VHA3.UK
OUTDOOR CONTROLLER BOARD (C.B) has been changed.
(Corresponding to the additional combination between PKA-RP•HAL/KAL, PCA-RP•KA and PEAD-RP•JA(L))
* In case of UL error, the compressor may be damaged if the unit is restarted by remote controller.
To avoid the damage, unit has the system that is not able to be restarted unless the power is turned OFF once.
PUHZ-P100VHA3.UK PUHZ-P100VHA3R1.UK
PUHZ-P125VHA3.UK PUHZ-P125VHA3R1.UK
PUHZ-P140VHA3.UK PUHZ-P140VHA3R1.UK
• Fan grille has been changed.
• Structural parts have been changed. (Munsell 5Y 7/1 →3Y 7.8/1.1)

3
3SAFETY PRECAUTION
Cautions for units utilizing refrigerant R410A
3-1. CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
Store the piping to be used indoors during
installation and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
In case of using the existing pipes for R22, be careful with
the followings.
· Be sure to clean the pipes and make sure that the insides
of the pipes are clean.
· 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.
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.
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 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.
[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.)

4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A 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
Cautions for refrigerant piping work
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same
as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore, as the working
pressure of R410A is 1.6 time higher than that of R22, their sizes of flared sections and flare nuts are different.
1Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 0.7mm or below.)
2Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other refriger-
ants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A have been speci-
fied separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also
have partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe flaring
dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.
Use torque wrench corresponding to each dimension.
3Tools for R410A (The following table shows whether conventional tools can be used or not.)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
0.8
0.8
0.8
1.0
—
0.8
0.8
0.8
1.0
1.0
Nominal
dimensions(inch)
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness (mm)
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
9.1
13.2
16.6
19.7
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions(inch)
Flare cutting dimensions
Outside
diameter Dimension A ( )
+0
-0.4
(mm)
R410A R22 1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
17.0
22.0
26.0
29.0
—
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions(inch)
Flare nut dimensions Outside
diameter Dimension B (mm)
R410A
+
+36.0mm for
indoor unit
of RP100,
125 and 140
R22
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge and
Operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Apply to flared section
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Flaring work of piping
Bend the pipes
Cut the pipes
Weld the pipes
Refrigerant charge
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil and alkylbenzene
oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adop-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Can R407C tools be used?
Ester oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
Dimension A
Dimension B