Mitsubishi Electric Mr. Slim SUZ-SA71VA Operating manual

TECHNICAL & SERVICE MANUAL
No.OCH561
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R410A
Outdoor unit
[Model Name] [Service Ref.]
SUZ-SA71VA SUZ-SA71VA.TH
CONTENTS
1. COMBINATION OF INDOOR AND OUTDOOR UNITS
..... 2
2. TECHNICAL CHANGES ................................... 3
3. PARTS NAMES AND FUNCTIONS .................. 6
4. SPECIFICATION................................................ 7
5. NOISE CRITERIA CURVES .............................. 9
6. OUTLINES AND DIMENSIONS ...................... 10
7. WIRING DIAGRAM...........................................11
8. REFRIGERANT SYSTEM DIAGRAM ............. 12
9. ACTUATOR CONTROL................................... 13
10. SERVICE FUNCTIONS.................................... 14
11. TROUBLESHOOTING ..................................... 14
12. DISASSEMBLY INSTRUCTIONS.................... 29
Indication of
model name
Note:
• This service manual
describes technical data of
the outdoor units only.
HFC
utilized
R410A
May 2014
PARTS CATALOG (OCB561)

2 3
1COMBINATION OF INDOOR AND OUTDOOR UNITS
Heat pump type
Outdoor unit
SUZ-SA71VA.TH
PLA-SP71BA.UK
OCH565
OCB565
Indoor unit
Service
Manual No.
Service Ref.
Heat pump without
electric heater
PEAD-SP71JA(L)Q.UK
—
Note: Please refer to the service manual of indoor unit or the technical data book for the combination data.
INDOOR UNIT SERVICE MANUAL
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3
2TECHNICAL CHANGES
Refrigerant
oil
Refrigerant
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-51.4
1.557
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
None
None
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
None
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (°C)
Steam pressure [25°C](Mpa)
Saturated steam density [25°C](Kg/K)
Combustibility
ODP *1
GWP *2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
*1: Ozone Depletion Potential : based on CFC-11
*2: Global Warming Potential : based on CO2
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer.
• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners.
As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/materi-
als are required. Refer to the table below.
Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and installa-
tion, since it is more susceptible to contaminations than R22.
For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system).
The conversion factor is: 1 (MPa [Gauge]) =10.2 (kgf/cm2[Gauge])
New Specification Current Specification
The incompatible refrigerant oil easily separates from
refrigerant and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
refrigerant oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigerant oil are compatible with
each other, refrigerant oil backs to the compressor through
the lower position oil back hole.
Compressor
Suction muffler
Oil back hole
Refrigerant oil
Refrigerant
Compressor
Suction muffler
Oil back hole
Refrigerant oil /Refrigerant
Compressor
OCH561

45
R410A tools Can R22 tools be used?
Gas leak detector
R410A has high pressures beyond the measurement range of existing
gauges. Port diameters have been changed to prevent any other refrigerant
from being charged into the unit.
Hose material and cap size have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
6.35 mm and 9.52 mm
Description
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization
No
No
No
Yes
Yes
New
New
New
Gauge manifold
Charge hose
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
No: Not substitutable for R410A Yes: Substitutable for R410A
No 12.7 mm and 15.88 mm
1. Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being
charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
-30 -20 -10 0 10 20 30 40 50 60
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
(MPa [Gauge])
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(:)
NOTE: The unit of pressure has been changed to MPa on the
international system of units (SI unit system).
The conversion factor is: 1 (MPa [Gauge]) =10.2 (kgf/cm2[Gauge])
OCH561

5
Electronic scale for refrigerant charging
Outdoor unit
Refrigerant gas
cylinder
operating valve
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Service port
Gauge manifold
valve (for R410A)
Union
Liquid pipe
Gas pipe
Stop valve
Indoor unit
Charge hose (for R410A)
R410A
Pipe diameter (mm)
6.35
9.52
12.7
15.88
17
22
26
29
Dimension of flare nut (mm)
R22
17
22
24
27
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less
than 0.8mm, as the pressure resistance is insufficient.
Flaring work and flare nut
Flaring work for R410A pipe differs from that for R22 pipe.
For details of flaring work, refer to Installation manual “FLARING WORK”.
3. Refrigerant oil
Apply the special refrigerant oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.
4. Air purge
Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant
circuit.
Use the vacuum pump for air purging for the purpose of environmental protection.
5. Additional charge
For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and
the outdoor unit. In this case, ability of the refrigerating cycle decreases or normal operation can be impossible. However,
charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.
2. Refrigerant piping
Specifications
Use the refrigerant pipes that meet the following specifications.
Wall thicknessOutside diameter
Pipe mm mm
For liquid
For gas
6.35
9.52
9.52
12.7
15.88
0.8
0.8
0.8
0.8
1.0
Heat resisting foam plastic
Specific gravity 0.045
Thickness 8 mm
Insulation material
OCH561

76 7
3PARTS NAMES AND FUNCTIONS
SUZ-SA71VA.TH
Model SUZ-SA·VA.TH
Drain socket 1
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
6. Pumping Down
When relocating or disposing of the air conditioner, pump down the system by following the procedure below so that no
refrigerant is released into the atmosphere.
1 Turn off the power supply (circuit breaker).
2 Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
3 Fully close the stop valve on the liquid pipe side of the outdoor unit.
4 Supply power (circuit breaker).
5 Perform the refrigerant collecting operation (cooling test run).
• For the PAR-31MAA, select “Service” → “TestRun” from the main menu to start the test run, and then select the cooling
mode.
• For details or for other information about starting the test run when using remote controllers, refer to the installation manual
for the indoor unit or the remote controller.
6 Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure gauge shows 0.05 to 0 MPa [Gauge]
(approx. 0.5 to 0 kgf/cm²) and quickly stop the air conditioner.
• Push the “ON/OFF” button on the remote controller to stop the air conditioner.
Note:
When the extension piping is very long with a large refrigerant amount, it may not be possible to perform a pump down
operation. In this case, use refrigerant recovery equipment to collect all of the refrigerant in the system.
7 Turn off the power supply (circuit breaker), remove the gauge manifold valve, and then disconnect the refrigerant pipes.
.Warning: When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
• If the refrigerant pipes are disconnected while the compressor is operating and the stop valve (ball valve) is open,
the pressure in the refrigeration cycle could become extremely high if air is drawn in, causing the pipes to burst,
personal injury, etc.
OCH561

77
SPECIFICATION
4
NOTE: Test conditions are based on ISO 5151
Cooling : Indoor D.B. 27°C W.B. 19°C
Outdoor D.B. 35°C
Heating : Indoor D.B. 20°C
Outdoor D.B. 7°C W.B. 6°C
Refrigerant piping length (one way): 5 m
*Measured under rated operating frequency.
Outdoor model SUZ-SA71VA.TH
Power supply Single phase 230V, 50Hz
Compressor
Model SNB172FEKMT
Output W 1,200
Current* Cooling A8.02
Heating 8.13
Refrigeration oil
(Model)
L0.4 (FV50S)
Fan motor
Model RC0J60-BC
Current* Cooling A0.83
Heating 0.82
Dimensions W × H × D mm 840 × 880 × 330
Weight kg 53
Special remarks
Air
ow*
Cooling
High
m³/h
3,426
Med. 3,006
Low 1,512
Heating
High 2,892
Med. 2,892
Low 2,280
Sound level* Cooling
dB(A) 55
Heating 55
Fan
speed
Cooling
High
rpm
950
Med. 840
Low 450
Heating
High 810
Med. 810
Low 650
Fan speed regulator 3
Refrigerant lling capacity
(R410A) kg 1.80
OCH561

98 9
SUZ-SA71VA.TH
Specifications and rating conditions of main electric parts
Model
Item
SUZ-SA71VA.TH
Smoothing
capacitor
(C61) —
(C62, C63) —
(CB1, 2, 3) 560μF 350V
Diode module (DB61) —
Fuse
(F61) —
(F62) T20A L250V
(F701, F801, F901) —
(IC700) —
Inteligent power
module
(IPM) 20A 600V
(IC932) 5A 600V
Power factor
controller
(PFC) 20A 600V
(IC820) —
Expansion valve
coil (LEV) DC12V
Reactor (L61) —
(L) 340μH 20A
Current-Limiting
PTC thermistor (PTC64, PTC65) 33 Ω
Terminal block (TB1, TB2) 3P
(TB) —
Relay
(X63) —
(X64) 20A 250V
(X601) 3A 250V
(X602) 3A 250V
R.V. coil (21S4) AC220-240V
OCH561

99
NOISE CRITERIA CURVES
5
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C
Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1 m
SUZ-SA71VA.TH
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
COOLING
FUNCTION SPL(dB(A)) LINE
High
FAN SPEED
HEATING
55
55
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
NC-10
OCH561

10 11
6OUTLINES AND DIMENSIONS
Unit: mm
417.5
40
42
Drain hole
175 500
330
50
Air in
Air out
2-Oval holes 10 21
840
109
81
880
452
Service panel
99.5
164.5
195
35
44
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared)
Ø 9.52
Gas refrigerant
pipe joint
Refrigerant pipe
(flared)
Ø 15.88
350 mm or more
100 mm or more
REQUIRED SPACE
Open as a rule
500mm or more if
the front and both
sides are open
100mm or more
200mm or more if
there are obstacles
to both sides
Open as a rule
500mm or more if the back,
both sides and top are open
Air in
Bolt pitch for
installation
360
SUZ-SA71VA.TH
OCH561