Mitsubishi Electric Mr.Slim SUZ-KA25VA3 User manual

TECHNICAL & SERVICE MANUAL
No.OCH530
REVISED EDITION-A
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R410A
Outdoor unit
[Model Name] [Service Ref.]
SUZ-KA25VA3 SUZ-KA25VA3.TH
SUZ-KA35VA3 SUZ-KA35VA3.TH
SUZ-KA50VA3 SUZ-KA50VA3.TH
SUZ-KA60VA3 SUZ-KA60VA3.TH
SUZ-KA71VA3 SUZ-KA71VA3.TH
CONTENTS
1. COMBINATION OF INDOOR AND OUTDOOR UNITS
..... 2
2. TECHNICAL CHANGES ................................... 3
3. PARTS NAMES AND FUNCTIONS .................. 7
4. SPECIFICATION................................................ 8
5. NOISE CRITERIA CURVES ............................ 10
6. OUTLINES AND DIMENSIONS .......................11
7. WIRING DIAGRAM.......................................... 13
8. REFRIGERANT SYSTEM DIAGRAM ............. 16
9. ACTUATOR CONTROL................................... 19
10. SERVICE FUNCTIONS.................................... 20
11. TROUBLESHOOTING ..................................... 20
12. DISASSEMBLY INSTRUCTIONS.................... 36
Indication of
model name
HFC
utilized
R410A
SUZ-KA25VA3.TH
SUZ-KA35VA3.TH
September 2013
PARTS CATALOG (OCB530)
Note:










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
SLZ-KA25VAL2.TH
SLZ-KA35VALR3.TH
SLZ-KA50VALR3.TH
SLZ-KA25VAQ2.TH
SLZ-KA35VAQR2.TH
SLZ-KA50VAQR2.TH
SEZ-KD25VA(L)R2.TH
SEZ-KD35VA(L)R2.TH
SEZ-KD50VA(L)R2.TH
SEZ-KD60VA(L)R2.TH
SEZ-KD71VA(L)R2.TH
SEZ-KD25VAQR2.TH
SEZ-KD35VAQR2.TH
SEZ-KD50VAQR2.TH
SEZ-KD60VAQR2.TH
SEZ-KD71VAQR2.TH
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OC320
OCH493
Indoor unit
Service
Manual No.
Service Ref.
Heat pump without electric heater
KA25VA3.TH KA60VA3.TH KA71VA3.THKA50VA3.TH
HWE0711
BWE102050
BWE102040
HWE1008
KA35VA3.TH

INDOOR UNIT SERVICE MANUAL
OCH530
A


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/*)
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
 
 
-

-





NOTE 
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
OCH530
A


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
 
 
 
-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

1 (MPa [Gauge]) =10.2 (kgf/cm2[Gauge])
OCH530
A


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



 
 
3. Refrigerant oil
 
4. Air purge




5. Additional charge
 



2. Refrigerant piping

 
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
OCH530
A


6. Pumping Down


1 
2 
3 
4 
5 
  

 
 
6 
 
 
Note:


7 
.Warning: When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
 
the pressure in the refrigeration cycle could become extremely high if air is drawn in, causing the pipes to burst,
personal injury, etc.
OCH530
A


3PARTS NAMES AND FUNCTIONS
SUZ-KA25VA3.TH
SUZ-KA35VA3.TH
SUZ-KA50VA3.TH
SUZ-KA60VA3.TH
SUZ-KA71VA3.TH
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
Model SUZ-KA·VA3.TH
 
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
OCH530
A


SPECIFICATION
4

   
   
  
    
 
 

SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH
 

Model    
     


 A    
     

(Model)
L    

Model   


 A    
     
 mm  
      






   
    
     

    
     
     
 

   
    





   
   
    

   
   
    
 

      
OCH530
A

99
SUZ-KA25VA3.TH SUZ-KA35VA3.TH
SUZ-KA50VA3.TH SUZ-KA60VA3.TH
SUZ-KA71VA3.TH
Specifications and rating conditions of main electric parts
Model
Item
SUZ-KA25VA3.TH SUZKA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH


 — — + — —
 + + + — —
 — — —  
     — —

    — —
 — — —  
    — —
    — —


(IPM) — — — 
     


 — — —  
    — —

coil (LEV) 
     — —
(L) — — —  

  
  — — —  
    — —

    — —
 
 — — —  
 — — —  
  
OCH530
A


NOISE CRITERIA CURVES
5
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
COOLING
FUNCTION SPL(dB(A)) LINE
High
Med.
FAN SPEED
HEATING
47
48
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
SUZ-KA25VA3.TH
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
COOLING
FUNCTION SPL(dB(A)) LINE
FAN SPEED
HEATING
49
50
High
Med.
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
SUZ-KA35VA3.TH
COOLING
FUNCTION SPL(dB(A)) LINE
High
FAN SPEED
HEATING
52
52
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
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
SUZ-KA50VA3.TH
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-KA60VA3.TH SUZ-KA71VA3.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
OCH530
A


6OUTLINES AND DIMENSIONS
10
69
800
302.5
500 Bolt pitch for installation
150
22.3
Handle
550
280
164.5
99.5
170.5
23
Service panel
Service port
285
344.5
44
400
Air in
Air out
Air in
17.5
Bolt pitch for
installation
304~325
40
Liquid refrigerant pipe joint
Refrigerant pipe (flared) :6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) :9.52
43
35
2-Oval holes 10×21
REQUIRED SPACE
Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.
350mm or more
200mm or more
100mm or more
100mm or more
Open two sides of left,
right, or rear side.
Drain hole :42
Unit: mm
SUZ-KA25VA3.TH
SUZ-KA35VA3.TH
OCH530
A


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)
Ø6.35...(SUZ-KA50/60VA3)
Ø9.52...(SUZ-KA71VA3)
Gas refrigerant
pipe joint
Refrigerant pipe
(flared)
Ø12.7...(SUZ-KA50VA3)
Ø15.88...(SUZ-KA60/71VA3)
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-KA50VA3.TH
SUZ-KA60VA3.TH
SUZ-KA71VA3.TH
Unit: mm
OCH530
A


7WIRING DIAGRAM
SUZ-KA25VA3.TH
SUZ-KA35VA3.TH
OCH530
A


SUZ-KA50VA3.TH
OCH530
A


SUZ-KA60VA3.TH
SUZ-KA71VA3.TH
OCH530
A


REFRIGERANT SYSTEM DIAGRAM
8
Unit: mm
SUZ-KA25VA3.TH
Unit: mm
SUZ-KA35VA3.TH
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainer)
Stop valve
(with service port)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
Ambient
temperature
thermistor
RT65
Muffler
Capillary tube
ø3.0×ø2.0×240
Outdoor heat
exchanger
temperature
thermistor
RT68
Muffler Outdoor
heat
exchanger
LEV
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainer)
Stop valve
(with service port)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
Capillary tube
ø3.0×ø1.8×600(×2)
LEV
Ambient
temperature
thermistor
Muffler
Capillary tube
ø3.0×ø2.0×240
Outdoor heat
exchanger
temperature
thermistor
Muffler
RT65
RT68
OCH530
A


Unit: mm
SUZ-KA50VA3.TH
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Stop valve
(with service port)
Capillary tube
ø 4.0 × ø 2.4 × 100
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe
ø 12.7
(with heat insulator)
Refrigerant pipe ø 6.35
(with heat insulator)
LEV
R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Muffler
Unit: mm
SUZ-KA60VA3.TH
SUZ-KA71VA3.TH
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Stop valve
(with service port)
Capillary tube
ø 4.0 × ø 2.4 × 100 Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe
(with heat insulator)
ø 15.88
Refrigerant pipe
(with heat insulator)
ø 6.35...(SUZ-KA60VA3)
ø 9.52...(SUZ-KA71VA3)
LEV R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
OCH530
A


ADDITIONAL REFRIGERANT CHARGE (R410A: g)
SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH
SUZ-KA60VA3.TH SUZ-KA71VA3.TH
MAX. REFRIGERANT PIPING LENGTH
Max. Length
A
* Height difference limitations are binding regardless of which unit, indoor or outdoor, is position high.
* Max. Height
difference
B
Indoor
unit
Outdoor unit
MAX. HEIGHT DIFFERENCE


Model 


  9m       
SUZ-KA25VA3.TH           
SUZ-KA35VA3.TH           

Model  

  
SUZ-KA25VA3.TH   

SUZ-KA35VA3.TH
SUZ-KA50VA3.TH
 

SUZ-KA60VA3.TH 
SUZ-KA71VA3.TH 
Model 


     
SUZ-KA50VA3.TH       
SUZ-KA60VA3.TH       
Model 


     
SUZ-KA71VA3.TH       
OCH530
A


ACTUATOR CONTROL
9
SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH
SUZ-KA60VA3.TH SUZ-KA71VA3.TH
9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
9-2. R.V. COIL CONTROL
 ON
 
  
ON
OFF
ON
OFF
Outdoor fan
Compressor
5 seconds 15 seconds
ON
OFF
Compressor
Outdoor fan
motor
R.V.coil ON
OFF
ON
OFF
<COOL>
5 seconds
<HEAT>
5 seconds
9-1. OUTDOOR FAN MOTOR CONTROL



NOTE

 

 LEV 
   

  


 
 
  
  

  


 
 
OCH530
A


SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH
SUZ-KA60VA3.TH SUZ-KA71VA3.TH
CHANGE IN DEFROST SETTING
Changing defrost finish temperature

11 TROUBLESHOOTING
3. Troubleshooting procedure
 -





SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH
SUZ-KA60VA3.TH SUZ-KA71VA3.TH
11-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following:


2. Take care the following during servicing.








Housing point
Lead wire
10 SERVICE FUNCTIONS


SUZ-KA25VA3.TH
SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH
   9 
   
OCH530
A