Mitsubishi Electric Mr.SLIM PUZ-A42NHA5-BS User manual

SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL·································2
2. SAFETY PRECAUTION·································2
3. FEATURES·····················································6
4. SPECIFICATIONS··········································7
5. DATA·······························································8
6. OUTLINES AND DIMENSIONS··················· 11
7. WIRING DIAGRAM ······································12
8. WIRING SPECIFICATIONS··························13
9.
REFRIGERANT SYSTEM DIAGRAM ·············18
10. TROUBLESHOOTING··································20
11. EASY MAINTENANCE FUNCTION··············72
12. FUNCTION SETTING···································75
13.
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ·····83
14. DISASSEMBLY PROCEDURE·····················93
No.OCH512
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
R410A
April 2012
[Model names]
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
[Service Ref.]
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
PUZ-A42NHA5
PUY-A42NHA5
Outdoor unit
PARTS CATALOG (OCB512)
Note:
•This manual describes
only service data of the
outdoor units.
•
RoHS compliant products
have <G> mark on the
spec name plate.

2
1REFERENCE MANUAL
INDOOR UNIT
Model name Service Ref. Service manual No.
PLA-A42BA4 PLA-A42BA4 OCH482
OCB482
PCA-A42KA5 PCA-A42KA5.TH OCH501
OCB501
PEAD-A42AA4 PEAD-A42AA4 HWE0905A
2SAFETY PRECAUTION
Before obtaining access to terminal, all supply circuits must be disconnected.
Preparation 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.
2-1. ALWAYS OBSERVE FOR SAFETY
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3
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 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 to be used indoors during
installation, 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 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.
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.
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
Use the specified refrigerant only.
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
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4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[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.)
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications.
· 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 —
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5
2-3. 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 [7/256 inch] 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 of its working pressure is higher than that of other
refrigerants. Therefore, to enhance air tightness and intensity, flare cutting dimension of copper pipe for R410A has
been specified 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 intensity as shown below. Set copper pipe correctly referring to cop-
per 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 [1/32]
0.8 [1/32]
0.8 [1/32]
1.0 [5/128]
—
0.8 [1/32]
0.8 [1/32]
0.8 [1/32]
1.0 [5/128]
1.0 [5/128]
Nominal
dimensions[inch]
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness : mm [inch]
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
9.1 [11/32-23/64]
13.2 [1/2-33/64]
16.6 [41/64-21/32]
19.7 [49/64-25/32]
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions[inch]
Flare cutting dimensions
Outside
diameter Dimension A ( )
+0
-0.4
Unit : mm [inch]
R410A R22 1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
17.0 [43/64]
22.0 [7/8]
26.0 [1-3/64]
29.0 [1-9/64]
—
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions[inch]
Flare nut dimensions Outside
diameter Dimension B
Unit : mm [inch]
R410A 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
Collection of refrigerant
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, ether 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 can be used for other refrigerants
Tools can be used for other refrigerants
Tools can be used for other refrigerants
Tools can be used for other refrigerants
Tools can be used for other
refrigerants
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)
: 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
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6
3 FEATURES
CHARGELESS SYSTEM
PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT.
(Max. 100ft, 30m)
The refrigerant circuit with LEV (Linear Expansion Valve) and accumulator always control the optimal refrigerant level
regardless of the length (100ft, 30m max. and 16ft, 5m min.) 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.
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
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7
4 SPECIFICATIONS
Service Ref. PUZ-A42NHA5
PUZ-A42NHA5-BS
Power supply Phase Single
Cycle 60Hz
Voltage 208/230V
MCA A 26
MOCP A 40
Breaker size A 30
External finish Munsell 3Y 7.8/1.1
Heat exchanger Plate fin coil
Defrost method Reverse cycle
Crankcase heater kW -
Compressor Hermetic
Model ANB33FCTMT
Motor output kW 2.5
R.L.A. 20
L.R.A. 27.5
Starter type Inverter
Fan Fan(drive)%No. Propeller fan %2
Fan motor output kW 0.086 + 0.086
Fan motor F.L.A. 0.40 + 0.40
Airflow m3/min 100
CFM 3530
Sound level Cooling dB 51
Heating dB 55
Protection devices HP switch
Comp. shell thermo
Dimension W mm 950
Dmm 330+30
Hmm 1350
W in. 37-12/32
D in. 13 + 1-3/16
H in. 53-5/32
Weight kg 114
lbs 251 R410A
Refrigerant Charged kg 4.5
lbs 10
Ether (FV50S)
Control Linear expansion valve
Oil Model
Charged L 1.4
oz 45
Refrigerant Pipe size OD mm 9.52
piping Liquid in. 3/8
Pipe size OD mm 15.88
Gas in. 5/8
Connection method Indoor Flared
Connection method Outdoor Flared
Height difference m Max. 30
IU - OU ft Max. 100
Piping length m Max. 50
ft Max. 165
PUY-A42NHA5
PUY-A42NHA5-BS
–
112
247
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8
Piping Length (one way)
Charged
Factory
Service Ref. 50ft 60ft 70ft 80ft 90ft 100ft 110ft 120ft 130ft 140ft 150ft 160ft 165ft
15m 18m 21m 24m 27m 30m 33m 37m 40m 43m 46m 49m 50m
PUY-A42NHA5-BS
PUY-A42NHA5
PUZ-A42NHA5-BS
PUZ-A42NHA5 132 oz 136 oz 142 oz 148 oz 154 oz 160 oz 166 oz 172 oz 178 oz 184 oz 190 oz 196 oz 202 oz 160 oz
3.7 kg 3.9 kg 4.0 kg 4.2 kg 4.4 kg 4.5 kg 4.7 kg 4.9 kg 5.0 kg 5.2 kg 5.4 kg 5.6 kg 5.7 kg 4.5 kg
Longer pipe than 70 or 100 ft,additional charge is required.
PUZ-A42NHA5
Service Ref. PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
Compressor model ANB33FCTMT
()
Winding Registance
U-V 0.302
U-W 0.302
W-V 0.302
(at 20°C,68°F )
5-1. REFILLING REFRIGERANT CHARGE (R410A : oz, kg)
5-2. COMPRESSOR TECHNICAL DATA
5DATA
5ft
3.3ft
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
COOLING
MODE
HEATING
51
SPL(dB)
55
LINE
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5-3. STANDARD OPERATION DATA
Representative matching PLA-A42BA4
Mode COOLING HEATING
Total Capacity BTU/h 42,000 45,000
Input W 4,600 4,450
Electrical circuit
Indoor unit model PLA-A42BA4
Phase Single
Cycle 60Hz
Voltage 230V
Current 1.00A 0.94A
Outdoor unit model PUZ-A42NHA5
Phase Single
Cycle 60Hz
Voltage 230V
Current
Refrigerant circuit
Discharge pressure MPa
Suction pressure MPa
Discharge temperature 
Condensing temperature 
Suction temperature 
Ref. Pipe length m
20.4A
2.83
0.82
73.4
47.5
4.9
7.6
410
120
164
118
40
21.5A
2.93
0.69
80.3
47.5
0.3
7.6
425
100
177
118
33
Discharge pressure PSIG
Suction pressure PSIG
Discharge temperature °F
Condensing temperature °F
Suction temperature °F
Ref. Pipe length ft 25 25
side
Indoor Intake air temperature DB 26.7 21.1
Intake air temperature WB 19.4 15.6
Discharge air temperature DB 12.9 41.9
side
Outdoor Intake air temperature DB 35 8.3
Intake air temperature WB 23.9 6.1
side
Indoor Intake air temperature DB °F 80 70
Intake air temperature WB °F 67 60
Discharge air temperature DB °F 55 107
side
Outdoor Intake air temperature DB °F 95 47
Intake air temperature WB °F 75 43
SHF 0.71
BF
–
–0.15
5-3-1. Heat pump
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Representative matching PLA-A42BA4
Mode COOLING
Total Capacity BTU/h 42,000
Input W 4,600
Electrical circuit
Indoor unit model PLA-A42BA4
Phase Single
Cycle 60Hz
Voltage 230V
Current 1.00A
Outdoor unit model PUY-A42NHA5
Phase Single
Cycle 60Hz
Voltage 230V
Current 20.4A
Refrigerant circuit
Discharge pressure MPa
Suction pressure MPa
Discharge temperature 
Condensing temperature 
Suction temperature 
Ref. Pipe length m
2.83
0.82
73.4
47.5
4.9
7.6
410
120
164
118
40
Discharge pressure PSIG
Suction pressure PSIG
Discharge temperature °F
Condensing temperature °F
Suction temperature °F
Ref. Pipe length ft 25
side
Indoor Intake air temperature DB 26.7
Intake air temperature WB 19.4
12.9
Discharge air temperature DB 
side
Outdoor Intake air temperature DB 35
Intake air temperature WB 23.9
side
Indoor Intake air temperature DB °F 80
Intake air temperature WB °F 67
55
Discharge air temperature DB °F
side
Outdoor Intake air temperature DB °F 95
Intake air temperature WB °F 75
SHF 0.71
BF 0.15
5-3-2. Cooling only
OCH512