Mitsubishi Electric PUHZ-HRP71VHA User manual

SERVICE MANUAL No.OCH425
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R410A
October 2007
PUHZ-HRP71VHA
PUHZ-HRP100VHA
PUHZ-HRP100YHA
PUHZ-HRP125YHA
NOTE:
• This manual describes only
service data of the outdoor
units.
• RoHS compliant products have
<G> mark on the spec name
plate.
PARTS CATALOG (OCB425)
Outdoor unit
[model names]
PUHZ-HRP71VHA
PUHZ-HRP100VHA
PUHZ-HRP100YHA
PUHZ-HRP125YHA
[Service Ref.]
PUHZ-HRP71VHA
PUHZ-HRP100VHA
PUHZ-HRP100YHA
PUHZ-HRP125YHA
CONTENTS
1. REFERENCE MANUAL·································· 2
2. SAFETY PRECAUTION ································· 3
3. FEATURES ····················································· 7
4. SPECIFICATIONS··········································· 8
5. DATA ······························································· 9
6. OUTLINES AND DIMENSIONS···················· 12
7. WIRING DIAGRAM······································· 13
8. WIRING SPECIFICATIONS ·························· 15
9. REFRIGERANT SYSTEM DIAGRAM ·········· 20
10. TROUBLESHOOTING································ 22
11. FUNCTION SETTING ································· 77
12.
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ···· 84
13. EASY MAINTENANCE FUNCTION ··········· 94
14. DISASSEMBLY PROCEDURE··················· 99

2
1REFERENCE MANUAL
1-1. INDOOR UNIT SERVICE MANUAL
Model name Service Ref. Service
Manual No.
OC331
PKA-RP60/100FAL
PKA-RP50FAL2
PKA-RP60/100FAL
PKA-RP50FAL2
PEAD-RP60/71/100GA PEAD-RP60/71/100GA.UK
PLA-RP35/50/60/100/125BA PLA-RP35/50/60/100/125BA(1).UK OCH412
OCB412
HWE05060
PEAD-RP50/60/71/125EA
PEAD-RP100EA2
PEAD-RP50/60/71/125EA.UK
PEAD-RP100EA2.UK HWE05210
1-2. TECHNICAL DATABOOK
Manual No. OCS11

3
2SAFETY PRECAUTION
Cautions for units utilizing refrigerant R410A
2-2. 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 during installation
indoors and keep 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 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 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.)
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.
No. Tool name Specifications
Gauge manifold ·Only for R410A
·Use the existing fitting specifications. (UNF1/2)
·Use high-tension side pressure of 5.3MPa·G or over.
Charge hose ·Only for R410A
·Use pressure performance of 5.09MPa·G or over.
Electronic scale
Gas leak detector ·Use the detector for R134a, R407C or R410A.
Adaptor for reverse flow check ·Attach on vacuum pump.
Refrigerant charge base
Refrigerant cylinder ·Only for R410A ·Top of cylinder (Pink)
·Cylinder with syphon
Refrigerant recovery equipment
[4] Refrigerant leakage detection function
This air conditioner can detect refrigerant leakage which may happen during a long period of use. In order to enable the
leakage detection, settings are required to let the unit memorize the initial conditions(initial learning). Refer to 13-3. INITIAL
SETTINGS FOR REFRIGERANT LEAKAGE DETECTION FUNCTION.

5
2-3. PRECAUTIONS WHEN REUSING EXISTING R22 REFRIGERANT PIPES
(1) Flowchart
Connecting a new air conditioner
Flaring work should be done so that flare meets the dimension for R410A.
·Use flare nut provided with indoor and outdoor unit.
When using gas piping of :19.05mm for HRP100, 125
·Make sure that DIP SW8-1 on outdoor unit controller board is set to ON.
This is to keep the pressure on pipes within permissible range.
LUse different diameter joint or adjust the piping size by brazing.
When using pipes larger than specified size for HRP71
·Make sure that DIP SW8-1 on outdoor unit controller board is set to ON.

This is to prevent oil flow ratio from lowering due to the decrease in flowing refrigerant.
LUse different diameter joint or adjust the piping size by brazing.
When existing pipes are specified size
·The pipes can be reused referring to TECHNICAL DATA BOOK.
LUse different diameter joint or adjust the piping size by brazing.
(When using existing pipes for HRP71, 100, 125
·Make sure that DIP SW8-2 on outdoor unit controller board is set to ON and perform
replacement operation.
+Chemical compounds containing chlorine left in existing pipes are recovered by replace filter.
LThe air conditioner automatically performs cooling operation through replace filter for about 2 hours.
Measure the existing pipe thickness and check for damage.
Check if existing air conditioner can operate.
The existing pipe thickness meets speci-
fications and the pipes are not damaged.
The existing pipe thickness does not meet
specifications or the pipes are damaged.
Existing pipes cannot be
reused. Use new pipes.
+In case that existing pipes were used
for gas or oil heat pump system,
be sure to clean the pipes for
HRP71, 100, 125 models.
Existing air conditioner can
operate.
Disconnect existing air con-
ditioner from piping.
Existing pipes can be reused.
Perform cooling operation
for about 30 minutes and
then do a pump down work.
Connect a new air conditioner.
Perform replacement operation.
·When performing replacement operation, make sure that DIP SW8-2 on outdoor unit controller board is
set to ON.
+Chemical compounds containing chlorine left in existing pipes are collected by replace filter.
The air conditioner automatically performs cooling operation through replace filter for about 2 hours.