Mitsubishi Electric SUZ-KA25VAH.TH Product guide

DATA BOOK
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
No.OC322
R410A
Outdoor unit
[model names] [Service Ref.]
SUZ-KA25VA SUZ-KA25VA.TH
SUZ-KA35VA SUZ-KA35VA.TH
SUZ-KA25VAH SUZ-KA25VAH.TH
SUZ-KA35VAH SUZ-KA35VAH.TH
SUZ-KA50VA SUZ-KA50VA.TH
SUZ-KA60VA SUZ-KA60VA.TH
SUZ-KA71VA SUZ-KA71VA.TH
CONTENTS
1. COMBINATION OF INDOOR AND OUTDOOR UNITS ······2
2. TECHNICAL CHANGES ···································2
3. PART NAMES AND FUNCTIONS······················6
4. SPECIFICATION·················································7
5. NOISE CRITERIA CURVES·····························11
6. OUTLINES AND DIMENSIONS ·······················12
7. WIRING DIAGRAM ··········································14
8. REFRIGERANT SYSTEM DIAGRAM··············18
9. PERFORMANCE CURVES······························22
10. ACTUATOR CONTROL····································48
11. SERVICE FUNCTIONS·····································49
12. TROUBLESHOOTING······································49
13. DISASSEMBLY INSTRUCTIONS·····················82
14. PARTS LIST······················································89
Indication of
model name
NOTE:
This service manual describes technical data of the
outdoor units.
•As for indoor units SLZ-KA25/35/50VA(L).TH and SEZ-
KA35/50/60/71VA.TH, refer to the service manual
OC320 and OC321.
HFC
utilized
R410A
SUZ-KA25VA(H).TH SUZ-KA35VA(H).TH
October 2005
REVISED EDITION-A
Revision:
•SUZ-KA71VA.TH is
added in REVISED
EDITION-A.
•Some descriptions
have been modified.
•Please void OC322.
OC322A--1qxp 05.10.19 3:28 PM Page 1

2
1COMBINATION OF INDOOR AND OUTDOOR UNITS
Heat pump type
Outdoor unit
SUZ-
SLZ-KA25VA(L).TH
SLZ-KA35VA(L).TH
SLZ-KA50VA(L).TH
SEZ-KC25VA.W
SEZ-KA35VA.TH
SEZ-KA50VA.TH
SEZ-KA60VA.TH
SEZ-KA71VA.TH
MFZ-KA25VA-E1
MFZ-KA35VA-E1
MFZ-KA50VA-E1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
OC320
—
OC321
OB409
Indoor unit
Service
Manual No.
Service Ref.
Heat pump without electric heater
KA35VA(H).THKA25VA(H).TH KA60VA.TH KA71VA.THKA50VA.TH
2TECHNICAL CHANGES
SUZ-A09VR.TH ➔SUZ-KA25VA.TH
SUZ-A12VR.TH ➔SUZ-KA35VA.TH
1.Indication of capacity has been changed.(BTU base➔kW base)
2.Control method between indoor and outdoor unit has been changed.
3.Power supply method has been changed (change to supply from outdoor unit).
4. Terminal block for power supply has been added.
5.Power P.C.board has been changed.
6.Inverter P.C. board has been changed.
7.Refrigerant circuit has been changed.
• Compressor has been changed.(KNB073FBVH➔KNB073FDVH:SUZ-KA25VA) (KNB092FAAH➔KNB092FCAH:SUZ-KA35VA)
• Specification and position of muffler have been changed.
• Path of outdoor heat exchanger has been changed.
• 4-way valve and R.V. coil have been changed.
• Stop valve has been changed.
8.Fan motor has been changed.(AC➔DC)
9.Shape of grille has been changed.
10.Shape of service panel has been changed.
11.Shape of propeller has been changed.
12.Symbol on terminal block has been changed (to S1/S2/S3).
SUZ-A18VR ➔SUZ-KA50VA.TH
SUZ-A24VR ➔SUZ-KA60VA.TH
1.Indication of capacity has been changed.(BTU base ➔kW base)
2.Power supply method has been changed (change to supply from outdoor unit).
3.Outdoor electronic control P.C. board has been changed.
4.Noise filter P.C. board has been changed.
5.Length of fan motor lead wire been changed.
6.Shape of relay panel has been changed.
7.Symbol on terminal block has been changed (to S1/ S2/ S3).
8.Control method between indoor and outdoor unit has been changed.
(NOTE)
Only the combination data of SLZ type and SEZ type have been described in this manual.
Please refer to the service manual of indoor unit or the technical data book for other combination.
OC322A--1qxp 05.10.19 3:28 PM Page 2

Refrigerating
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
Non
Non
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
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : 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.
1As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/
materials are required. Refer to the table below.
2Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4Composition 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/ff[Gauge])
New Specification Current Specification
The incompatible refrigerating 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
refrigerating oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigerating oil are compatible each,
refrigerating oil backs to the compressor through the lower
position oil back hole.
Compressor
Suction muffler
Oil back hole
Refrigerating oil
Refrigerant
Compressor
Suction muffler
Oil back hole
Refrigerating oil /Refrigerant
Compressor
3
OC322A--1qxp 05.10.19 3:28 PM Page 3

-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/ff[Gauge])
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 R410Awith 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.
2. Refrigerant piping
1Specifications
Use the refrigerant pipes that meet the following specifications.
• 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.
Wall thickness
Outside 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
4
OC322A--1qxp 05.10.19 3:28 PM Page 4

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
2Flaring 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 refrigeration 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.
5
OC322A--1qxp 05.10.19 3:28 PM Page 5

6
3PART NAMES AND FUNCTIONS
OUTDOOR UNIT
Air inlet
Air outlet
Drain outlet
Piping
Drain hose
(back and side)
ACCESSORIES
1Drain socket 1
SUZ-KA25VA(H).TH
SUZ-KA35VA(H).TH
SUZ-KA25VA.TH
SUZ-KA35VA.TH
SUZ-KA25VAH.TH
SUZ-KA35VAH.TH
OUTDOOR UNIT Air inlet
Piping
Air outlet
(back and side)
Drain hose
Drain outlet
ACCESSORIES
1
2
Drain socket
Drain cap [33 1
2
SUZ-KA50VA.TH
SUZ-KA60VA.TH
SUZ-KA71VA.TH
SUZ-KA50VA.TH
SUZ-KA60VA.TH
SUZ-KA71VA.TH
OC322A--1qxp 05.10.19 3:28 PM Page 6

7
SPECIFICATION
4
Function
Power supply
Outdoor Service Ref.
Capacity Rated frequency(Min.~Max.)
Dehumidification
Air flow(High/Loww)
Starting current ✽1
Compressor motor current ✽1
Fan motor current ✽1
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level
✽1
Fan speed(Highw/Loww, Highw/Medw/Loww)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigerating oil (Model)
Thermistor RT61 (at 0:)
Thermistor RT62 (at 100:)
Thermistor RT64 (at 50:)
Thermistor RT65 (at 25:)
Thermistor RT61 (at 25:)
Thermistor RT62 (at 100:)
Thermistor RT64 (at 50:)
Thermistor RT65 (at 25:)
Thermistor RT68 (at 25:)
kW
r/h
K/h
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
k"
k"
k"
k"
k"
k"
k"
k"
k"
Single phase
230V,50Hz
3.65
KNB073FDVH
550
U-V 1.53 U-W 1.53
V-W 1.53
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
33
46
0.90
320 (NEO22)
32.6
13.4
17
10
—
—
—
—
—
Cooling
2.5(0.9-3.2)
0.5
2,058
2.74
0.31
3.62
810w/650w
2
880w/810w/650w
3840w/760w 2
880w/800w/630w
3
Heating
3.0(0.9-4.5)
—
1,938
3.37
0.28
3.61
SUZ-KA25VA(H).TH
Indoor Service Ref.
SLZ-KA25VA(L).TH Indoor Service Ref. SLZ-KA35VA(L).TH
Compressor
Fan motor
Special remarks
Coefficient of performance (C.O.P) ✽1
Capacity
Electrical data
SUZ-KA35VA(H).TH
Single phase
230V,50Hz
2,004
4.75
KNB092FCAH
650
U-V 0.49 U-W 0.49
V-W 0.49
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
37
1.05
320 (NEO22)
32.6
13.4
17
10
—
—
—
—
—
Cooling
3.5(1.0-3.9)
1.2
4.22
0.33
3.30
47
Heating
4.0(0.9-5.0)
—
4.42
0.33
3.64
48
Indoor Service Ref.
SLZ-KA50VA(L).TH
SUZ-KA50VA.TH
Single phase
230V,50Hz
6.75
0.30
SNB130FLDH
850
U-V 0.45 U-W 0.45
V-W 0.45
PM8H60-UB
WHT-BLK 15.2
BLK-RED 15.2
RED-WHT 15.2
840o850o330
53
2
1.60
450 (NEO22)
—
—
—
—
10.0
13.4
17.0
10.0
10.0
Cooling
4.6(1.1-5.2)
2.2
2,940/1,650
w
6.45
2.82
53/51w
800/480
w
Heating
5.0(0.9-6.5)
—
2,940/2,210
w
6.05
3.23
55/53w
800/620
w
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor D.B. 27:W.B. 19:
Outdoor D.B. 35:W.B. 24:
Heating : Indoor D.B. 20:W.B. 15:
Outdoor D.B. 7:W.B. 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
wReference value
SLZ-KA•VA(L).TH / SUZ-KA•VA(H).TH
OC322A--1qxp 05.10.19 3:28 PM Page 7

8
Single phase
230V,50Hz
3.65
KNB073FDVH
550
U-V 1.53 U-W 1.53
V-W 1.53
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
33
46
0.90
320 (NEO22)
32.6
13.4
17
10
Cooling
2.5(0.9-3.2)
1.0
2,058
2.74
0.31
3.42
810w/650w
2
Heating
3.0(0.9-4.5)
—
1,938
3.37
0.28
3.61
880w/810w/650w
3
Single phase
230V,50Hz
2,004
4.75
KNB092FCAH
650
U-V 0.49 U-W 0.49
V-W 0.49
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
37
1.05
320 (NEO22)
32.6
13.4
17
10
Cooling
3.5(1.0-3.9)
1.2
4.22
0.33
3.30
47
840w/760w
2
Heating
4.0(0.9-5.0)
—
4.42
0.33
3.64
48
880w/800w/630w
3
Outdoor Service Ref.
Function
Power supply
Capacity Rated frequency(Min.-Max.)
Dehumidification
Air flow ✽1
Starting current (Total) ✽1
Compressor motor current ✽1
Fan motor current ✽1
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level ✽1
Fan speed(Highw/Loww, High/Med.w/Loww)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigeration oil (Model)
Thermistor RT61
(at 0:)
Thermistor RT62(at 100:)
Thermistor RT64(at 50:)
Thermistor RT65(at 25:)
kW
r/h
K/h
A
A
A
✽1
W
"
"
mm
kg
dB(A)
rpm
kg
cc
k"
k"
k"
k"
Compressor
Fan motor
Special remarks
Coefficient of performance(C.O.P)
Capacity
Electrical data
SUZ-KA25VA(H).TH
Indoor Service Ref.
SEZ-KC25VA.W
SUZ-KA35VA(H).TH
Indoor Service Ref.
SEZ-KA35VA.TH
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Outdoor Dry-bulb temperature 35:Wet-bulb temperature(24:)
Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:
Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency
wReference value
SEZ-KC•VA.W, SEZ-KA•VA.TH / SUZ-KA•VA(H).TH
OC322A--1qxp 05.10.19 3:28 PM Page 8

9
Function
Power supply
Outdoor Service Ref.
Capacity Rated frequency(Min.~Max.)
Dehumidification
Air flow(High/Loww)
Starting current ✽1
Compressor motor current ✽1
Fan motor current
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level(High/Loww)
Fan speed(High/Loww)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigerating oil (Model)
Thermistor RT61 (at 25:)
Thermistor RT62 (at 100 :)
Thermistor RT64 (at 50:)
Thermistor RT65 (at 25:)
Thermistor RT68 (at 25:)
kW
r/h
K/h
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
k"
k"
k"
k"
k"
Indoor Service Ref.
SEZ-KA50VA.TH
Compressor
Fan motor
Special remarks
Coefficient of performance(C.O.P)
Capacity
Electrical data
SUZ-KA50VA.TH
Single phase
230V,50Hz
6.75
0.30
SNB130FLDH
850
U-V 0.45 U-W 0.45
V-W 0.45
RC0J60-AA
BLK-WHT 15.2
WHT-RED 15.2
RED-BLK 15.2
840o850o330
53
2
1.60
450 (NEO22)
10.0
13.4
17.0
10.0
10.0
Cooling
5.0(1.1-5.6)
1.9
2,940/1,650w
6.45
2.81
53/51w
800/480w
Heating
5.9(1.1-7.2)
—
2,940/2,210w
6.05
3.21
55/53w
800/620w
Indoor Service Ref.
SEZ-KA60VA.TH
SUZ-KA60VA.TH
Single phase
230V,50Hz
9.75
0.30
SNB130FLDH
850
U-V 0.45 U-W 0.45
V-W 0.45
RC0J60-AA
BLK-WHT 15.2
WHT-RED 15.2
RED-BLK 15.2
840o850o330
53
2
1.80
450 (NEO22)
10.0
13.4
17.0
10.0
10.0
Cooling
5.5(1.1-6.3)
2.0
2,940/1,650w
8.05
2.81
53/51w
800/480w
Heating
6.9(0.9-8.0)
—
2,940/2,210w
9.45
2.82
55/53w
800/620w
Indoor Service Ref.
SEZ-KA71VA.TH
SUZ-KA71VA.TH
Single phase
230V,50Hz
10.30
0.30
TNB220FMCH
1300
U-V 1.41 U-W 1.41
V-W 1.41
RC0J60-AA
BLK-WHT 15.2
WHT-RED 15.2
RED-BLK 15.2
840o850o330
58
2
2.00
870 (NEO22)
10.0
13.4
17.0
10.0
10.0
Cooling
7.1(0.9-8.3)
2.7
2,940/1,650w
10.00
2.89
53/51w
800/480w
Heating
8.1(0.9-10.4)
—
2,940/2,210w
9.60
3.43
55/53w
800/620w
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor D.B. 27:W.B. 19:
Outdoor D.B. 35:W.B. 24:
Heating : Indoor D.B. 20:W.B. 15:
Outdoor D.B. 7:W.B. 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
wReference value
SEZ-KA•VA.TH / SUZ-KA•VA.TH
OC322A--1qxp 05.10.19 3:28 PM Page 9

10
Model
Item
Current transformer
Current transformer
Smoothing capacitor
Diode module
Fuse
Fuse
Defrost heater
Intelligent power module
Expansion valve coil
Reactor
Current-detecting resistor
Current-detecting resistor
Current-limiting resistor
Terminal block
Relay
Relay
Relay
R.V. coil
Heater protector
SUZ-KA25VA.TH
(CT)
(CT761, CT781)
(
C63A, C63B, C63C )
(DB61, DB65)
(F61)
(F71, F801, F901)
(H)
(IPM)
(LEV)
(L61)
(R61)
(R831)
(
R64A, R64B )
(TB1,TB2)
(X63)
(X64)
(X66)
(21S4)
(26H)
SUZ-KA25VAH.TH SUZ-KA35VA.TH SUZ-KA35VAH.TH
ETA19Z59BZ
ETQ19Z71AY
620+ 420V
D25XB60
250V 20A
250V 3.15A
PS21244-A-203
CAD-MD12ME 12VDC
10A 23.0mH
25m"5W
5.1"5W
3P
G5NB-1a
G4A-1A-PS
STF-01AJ503
—
—
—
230V 130W
G5NB-1a
Open 45:
—
—
—
230V 130W
G5NB-1a
Open 45:
45m"5W (1 element) 50m"5W (2 elements)
Specifications and rating conditions of main electric parts
Model
Item
Smoothing capacitor
Current transformer
Current transformer
Fuse
Fuse
Fuse
Intelligent power module
High pressure switch
Intelligent power module
Reactor
Expansion valve coil
Power factor controller
Resistor
Resistor
Resistor
Solenoid coil relay
Terminal block
Terminal block
Relay
R.V. coil
(CB1,2,3)
(CT1,2)
(CT61)
(F64)
(F801)
(F911)
(HC930)
(HPS)
(IPM)
(L)
(LEV)
(PFC)
(R64A,B)
(R937A,B)
(RS1~4)
(SSR61)
(TB1)
(TB2)
(X64)
(21S4)
560+450V
ETQ19Z68AY
ETQ19Z53AY
250V 2A
250V 3.15A
250V 1A
PS21661-RZ
PS21244-A
340µH 20A
CAM-MD12ME
PS51259-A
10"10W
1.1"2W 2%
0.04"7W
TLP3506
3P
3P
G4A
LD30013
SUZ-KA50VA.TH SUZ-KA60VA.TH SUZ-KA71VA.TH
— ACB-DB156
SUZ-KA25VA.TH SUZ-KA25VAH.TH
SUZ-KA35VA.TH SUZ-KA35VAH.TH
SUZ-KA50VA.TH
SUZ-KA60VA.TH
SUZ-KA71VA.TH
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