Mitsubishi Electric Mr. Slim PUHZ-FRP71VHA2 User manual

SERVICE MANUAL R410A
Outdoor unit
[Model name]
PUHZ-FRP71VHA2
PUHZ-FRP71VHA2 PARTS CATALOG (OCB665)
CONTENTS
1. REFERENCE MANUAL····························2
2. SAFETY PRECAUTION····························3
3. FEATURES ············································7
4. SPECIFICATIONS ···································8
5. DATA ····················································9
6. OUTLINES AND DIMENSIONS················ 11
7. WIRING DIAGRAM································ 12
8. WIRING SPECIFICATIONS····················· 13
9. REFRIGERANT SYSTEM DIAGRAM ·········· 15
10. TROUBLESHOOTING ··························· 17
11. FUNCTION SETTING····························· 68
12. MONITORING THE OPERATION DATA
BY THE REMOTE CONTROLLER ·············72
13. EASY MAINTENANCE FUNCTION ·········· 82
14. DISASSEMBLY PROCEDURE················· 84
Note:
•This manual describes
only service data of the
outdoor units.
No.OCH665
REVISED EDITION-B
October 2019
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
Note:
•PUHZ-FRP71VHA2R1
has been added in
REVISED EDITION-B.
OCH665 REVISED
EDITION-A is void.
[Service Ref.]
PUHZ-FRP71VHA2
PUHZ-FRP71VHA2R1

2
OCH665B
INDOOR UNIT SERVICE MANUAL
AIR-CONDITIONER system
1REFERENCE MANUAL
For Air to Water system
Model name Service ref. Service manual No.
Parts catalog No.
EHST20C-VM2C
EHST20C-VM6C
EHST20C-YM9C
EHST20C-TM9C
EHST20C-VM2EC
EHST20C-VM6EC
EHST20C-YM9EC
EHST20C-MEC
EHST20C-MHCW
EHST20C-VM2C(R1/R2).UK
EHST20C-VM6C(R1/R2).UK
EHST20C-YM9C(R1/R2).UK
EHST20C-TM9C(R1/R2).UK
EHST20C-VM2EC(R1/R2).UK
EHST20C-VM6EC(R1/R2).UK
EHST20C-YM9EC(R1/R2).UK
EHST20C-MEC(R1/R2).UK
EHST20C-MHCW(R1/R2).UK
OCH570
OCB570
EHSC-VM2C
EHSC-VM2EC
EHSC-VM6C
EHSC-VM6EC
EHSC-YM9C
EHSC-YM9EC
EHSC-TM9C
EHSC-MEC
EHSC-VM2C(R1/R2/R3).UK
EHSC-VM2EC(R1/R2/R3).UK
EHSC-VM6C(R1/R2/R3).UK
EHSC-VM6EC(R1/R2/R3).UK
EHSC-YM9C(R1/R2/R3).UK
EHSC-YM9EC(R1/R2/R3).UK
EHSC-TM9C(R1/R2/R3).UK
EHSC-MEC(R1/R2/R3).UK
OCH571
OCB571
EHST20C-VM2D
EHST20C-VM6D
EHST20C-YM9D
EHST20C-TM9D
EHST20C-YM9ED
EHST20C-MED
EHST20C-VM2D.UK
EHST20C-VM6D.UK
EHST20C-YM9D.UK
EHST20C-TM9D.UK
EHST20C-YM9ED.UK
EHST20C-MED.UK
OCH714
OCB714
EHSC-VM2D
EHSC-VM6D
EHSC-YM9D
EHSC-YM9ED
EHSC-TM9D
EHSC-MED
EHSC-VM2D.UK
EHSC-VM6D.UK
EHSC-YM9D.UK
EHSC-YM9ED.UK
EHSC-TM9D.UK
EHSC-MED.UK
OCH712
OCB712
Model name Service Ref. Service Manual No.
PLA-ZM35/71EA PLA-ZM35/71EA.UK OCH650/OCB650
PKA-M71KA(L) PKA-M71KA(L).TH OCH661/OCB661
PSA-RP71KA PSA-RP71KA OCH528/OCB528
PEAD-M71JA(L)Q PEAD-M71JA(L)Q.UK —
PCA-M35/71KA PCA-M35/71KA OCH659/OCB659

3
OCH665B
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
2SAFETY PRECAUTION
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Preparations before the repair service.
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn off the power-supply beaker.
• Discharge the condenser before the work involving the electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be done without turning off the power,
exercise great caution not to touch the live parts.
Use new refrigerant pipes.
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.
Store the piping indoors, and 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.
In the case of using the existing pipes for R22, be careful
with the following.
· 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 compressor.
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.
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.

4
OCH665B
[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) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Electronic weighing scale
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 weighing scale —
4Gas leak detector · Use the detector for 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
OCH665B
2-3. PRECAUTIONS WHEN REUSING EXISTING R22 REFRIGERANT PIPES
(1) Flowchart
Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
• Refer to the owchart below to determine if the existing pipes can be used and if it is necessary to use a lter dryer.
• If the diameter of the existing pipes is different from the specied diameter, refer to technical data materials to conrm if the
pipes can be used.
▼
▼
▼
▼
▼
▼▼
Measure the existing pipe thickness and
check for damage.
The existing pipe thickness meets specica-
tions and the pipes are not damaged.
Check if the existing air conditioner can operate.
After operating the cooling system for about 30
minutes, do a pump down work.
Disconnect the existing air conditioner from the
pipes.
Attach the new air conditioner
Test run The existing pipes cannot be reused.
Use new pipes.
• If the existing air conditioner cannot operate, use a
refrigerant recovery device to collect the refrigerant.
• If the existing pipes have been used for gas or oil
heat pump system, use new pipes.
The existing pipe thickness does not meet
specications or the pipes are damaged.

6
OCH665B
(2) 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 times 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 0.7 mm or below.)
Diagram below: Piping diameter and thickness
Nominal
dimensions(inch) Outside diameter (mm) Thickness (mm)
R410A R22
1/4 6.35 0.8 0.8
3/8 9.52 0.8 0.8
1/2 12.70 0.8 0.8
5/8 15.88 1.0 1.0
3/4 19.05 — 1.0
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 strength, flare cutting dimension of copper pipe for R410A has been speci-
fied separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also
has partly been changed to increase strength as shown below. Set copper pipe correctly referring to copper pipe flaring
dimensions for R410A below. For 1/2 and 5/8 inch pipes, the dimension B changes.
Use torque wrench corresponding to each dimension.
Dimension A
Dimension B
Flare cutting dimensions Flare nut dimensions
Nominal
dimensions
(in) Outside
diameter (mm) Dimension A
(
+0
-0.4
)
(mm) Nominal
dimensions (in) Outside diameter (mm) Dimension A (mm)
R410A R22 R410A R22
1/4 6.35 9.1 9.0 1/4 6.35 17.0 17.0
3/8 9.52 13.2 13.0 3/8 9.52 22.0 22.0
1/2 12.70 16.6 16.2 1/2 12.70 26.0 24.0
5/8 15.88 19.7 19.4 5/8 15.88 29.0 27.0
3/4 19.05 — 23.3 3/4 19.05 — 36.0
3Tools for R410A (The following table shows whether conventional tools can be used or not.)
Tools and materials Use R410A tools
Can R22 tools be
used?
Can R407C tools be used?
Gauge manifold Air purge, refrigerant charge
and operation check Tool exclusive for R410A × ×
Charge hose Tool exclusive for R410A × ×
Gas leak detector Gas leak check Tool for HFC refrigerant × ○
Refrigerant recovery equipment Refrigerant recovery Tool exclusive for R410A × ×
Refrigerant cylinder Refrigerant charge Tool exclusive for R410A × ×
Applied oil Apply to ared section
Ester oil, ether oil and alkylbenzene oil
(minimum amount)
×Ester oil, ether oil: ○
Alkylbenzene oil: minimum
amount
Safety charger Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant Tool exclusive for R410A × ×
Charge valve Prevent gas from blowing out
when detaching charge hose Tool exclusive for R410A × ×
Vacuum pump Vacuum drying and air purge Tools for other refrigerants can be used if equipped with
adapter for reverse ow check
Δ(Usable if equipped
with adapter for
reverse flow)
Δ(Usable if equipped with
adapter for reverse flow)
Flare tool Flaring work of piping
Tools for other refrigerants can be
used by adjusting aring dimen-
sion
Δ(Usable by adjusting
aring dimension)
Δ(Usable by adjusting ar-
ing dimension)
Bender Bend the pipes
Tools for other refrigerants can be used ○ ○
Pipe cutter Cut the pipes
Tools for other refrigerants can be used ○ ○
Welder and nitrogen gas
cylinder Weld the pipes
Tools for other refrigerants can be used ○ ○
Refrigerant charging scale Refrigerant charge
Tools for other refrigerants can be used ○ ○
Vacuum gauge or thermistor
vacuum gauge and vacuum
valve
Check the degree of vacuum. (Vacuum
valve prevents back ow of oil and re-
frigerant to thermistor vacuum gauge)
Tools for other refrigerants can be used ○ ○
Charging cylinder Refrigerant charge Tool exclusive for R410A × -
×: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
Δ: Tools for other refrigerants can be used under certain conditions.
○: Tools for other refrigerants can be used.

7
OCH665B
3 FEATURES
CHARGELESS SYSTEM
PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT.
Maximum 30m (Air conditioner side and hot water side total)
The refrigerant circuit with LEV (Linear Expansion Valve) always control the optimal refrigerant level regardless of the length
(Total 30 m maximum and 5 m minimum) of piping. The additional refrigerant charging work during installation often causes
problems. It is completely eliminated by chargeless system. This unique system improves the quality and reliability of the
work done. It also helps to speed up the installation time.
PUHZ-FRP71VHA2

8
OCH665B
4 SPECIFICATIONS
Service Ref. PUHZ-FRP71VHA2
PUHZ-FRP71VHA2R1
OUTDOOR UNIT
Power source (Phase, cycle, voltage) Single, 50 Hz, 230 V
Max. current A 19
External nish Munsell 3Y 7.8/1.1
Refrigerant control Linear Expansion Valve
Compressor Hermetic
Model SNB172FSHM1
Motor output kW 1.6
Starter type Inverter
Protection devices HP switch
Comp. surface thermo
Discharge thermo
Crankcase heater W —
Heat exchanger Plate n coil
Fan Fan (drive) × No. Propeller fan x 1
Fan motor output kW 0.086
Airow K/min (CFM) 50 (1,760)
Defrost method Reverse cycle
Noise level ATACooling
HR Cooling dB 47
TA Heating
ATW Heating dB 49
Dimensions W mm (inch) 950 (37-3/8)
D mm (inch) 330+25 (13-7/8)
H mm (inch) 943 (37-1/8)
Weight kg(lb) 73 (161)
Refrigerant R410A
Charge kg(lb) 3.8 (8.4)
Oil (Model) L 0.70 (FV50S)
REFRIGERANT PIPING
Pipe size
O.D. ATA Liquid mm (inch) 9.52 (3/8)
Gas mm (inch) 15.88 (5/8)
ATW Liquid mm (inch) 9.52 (3/8)
Gas mm (inch) 15.88 (5/8)
Connection method ATAindoor side Flared
ATW indoor side Flared
Outdoor side Flared
Between the indoor &
outdoor Height difference Maximum 20 m
Piping length Maximum 60 m total, Maximum 30 m for each

9
OCH665B
5DATA
5-1. REFILLING REFRIGERANT CHARGE (R410A: kg)
U-V
U-W
W-V
Service Ref.
Compressor model
Winding
Resistance
( ")
(Winding temperature at 20°C)
SNB172FSHM1
1.34
1.34
1.34
PUHZ-FRP71VHA2
PUHZ-FRP71VHA2R1
Additional charge is required for pipes
longer than total 30 m.
Service Ref. Total piping length (one way) Initial
charged
10m 20m 30m 40m 50m 60m 75m
PUHZ-FRP71VHA2
PUHZ-FRP71VHA2R1 3.4 3.6 3.8 4.4 5.0 5.6 — 3.8
5-2. COMPRESSOR TECHNICAL DATA
5-3. NOISE CRITERION CURVES
1.5m
1m
MICROPHONE
UNIT
GROUND
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
PUHZ-FRP71VHA2
PUHZ-FRP71VHA2R1
ATA Cooling,
HR Cooling
ATA Heating,
ATW Heating
MODE
47
SPL(dB)
49
LINE

10
OCH665B
5-4. STANDARD OPERATION DATA
The unit of pressure has been changed to MPaG based on international SI system.
The conversion factor is: 1(MPaG)=10.2(kgf/cm²)
Representative matching PEAD-M71JAQ
Plate HEX ACH70-40
Mode ATA Cooling ATA Heating ATW Heating HR Cooling
Total
ATA capacity W 7,100 8,000 — 7,100
ATW capacity W — — 8,000 9,000
Input kW 2.10 2.11 1.99 3.22
COP 3.38 3.79 4.03 5.00
Electrical circuit
Indoor unit PEAD-M71JAQ
Phase, Hz 1 , 50 1 , 50 — 1 , 50
Voltage V 230 230 — 230
Current A 0.17 0.15 — 0.17
Outdoor unit PUHZ-FRP71VHA2
Phase, Hz 1 , 50 1 , 50 1 , 50 1 , 50
Voltage V 230 230 230 230
Current A 9.14 9.22 8.81 13.97
Refrigerant circuit
Discharge pressure MPa 2.79 2.46 2.13 3.39
Suction pressure MPa 0.96 0.71 0.70 0.94
Discharge temperature °C 71 62 53 80
Condensing temperature °C 47 42 37 57
Suction temperature °C 10 0 0 9
Ref. pipe length m 5 + 5 5 + 5 5 + 5 5 + 5
ATA indoor
side
Intake air temperature DB °C 27 20 — 27
WB °C 19 15 — 19
Discharge air temperature DB °C 14.5 36 — 14.5
ATW side
Return temperature °C — — 30 50
Flow temperature °C — — 35 55
Flow rate L/min — — 23 23
Outdoor
side
Intake air temperature DB °C 35 7 7 35
WB °C 24 6 6 24
SHF 0.81 — — 0.81
BF 0.11 — — 0.11