Mitsubishi Mr.SLIM SLZ-KA25VAQ Operating manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. PART NAMES AND FUNCTIONS.......2
2. SPECIFICATIONS ...............................5
3. OUTLINES AND DIMENSIONS........... 7
4. WIRING DIAGRAM..............................9
5.
REFRIGERANT SYSTEM DIAGRAM
.....10
6. TROUBLESHOOTING....................... 11
7. 4-WAY AIR FLOW SYSTEM.............. 23
8. DISASSEMBLY PROCEDURE..........25
December 2010
No. OCH493
WIRED REMOTE CONTROLLER
(Option)
Indoor unit
[Model names] [Service Ref.]
SLZ-KA25VAQ SLZ-KA25VAQ.TH
SLZ-KA35VAQ SLZ-KA35VAQ.TH
SLZ-KA50VAQ SLZ-KA50VAQ.TH
INDOOR UNIT
Model name
indication
ON/OFF
TEMP.
Note:
• This manual describes only
service data of the indoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
• For servicing RoHS compli-
ant products, refer to the
RoHS Parts List.
PARTS CATALOG (OCB493)

2
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Grille
Filter
Removes dust and pollutants
from inhaled air.
Horizontal Air Outlet
Sets horizontal airflow automatically
during cooling or dehumidifying.
Air Intake
Inhales air from room.
Indoor Unit
SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH
1PART NAMES AND FUNCTIONS
Note:
The phrase “Wired remote controller” in this service manual refers only to the PAR-21MAA.
If you need any information for the PAR-30MAA, please refer to the instruction book included in PAR-30MAA box.

33
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
Temperature setting buttons
Down
Up
Timer Menu button
(Monitor/Set button)
Mode button (Return button)
Set Time buttons
Back
Ahead
Timer On/Off button
(Set Day button)
Opening the
cover
ON/OFF button
Fan Speed button
Filter button
(<Enter> button)
Test Run button
Check button (Clear button)
Airflow Up/Down button
Louver button
( Operation button)
To return operation
number
Ventilation button
( Operation button)
To go to next operation
number
Built-in temperature sensor
Wired remote controller (Option)
Once the controllers are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH

4
Wired remote controller (Option)
●
●
°F°C
°F°C
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
Note:
“PLEASE WAIT” message
This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.
“NOTAVAILABLE” message
This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.
Display Section
For purposes of this explanation,
all parts of the display are shown.
During actual operation, only
the relevant items will be lit.
Identifies the current operation
Shows the operating mode, etc.
*Multilanguage display is available.
“Centrally Controlled” indicator
Indicates that operation from the
remote controller has been prohib-
ited by a master controller.
“Timer is Off” indicator
Indicates that the timer is off.
Temperature Setting
Shows the target temperature.
Day-of-Week
Shows the current day of the week.
Time/Timer Display
Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, the time to be
switched off is shown.
“Sensor” indication
Displays when the remote controller
sensor is used.
“Locked” indicator
Indicates that remote controller but-
tons have been locked.
“Clean The Filter” indicator
To be displayed on when it is time to
clean the filter.
Timer indicators
The indicator comes on if the corre-
sponding timer is set.
Up/Down Air Direction indica-
tor
Shows the direction of the
outcoming airflow.
“One Hour Only” indicator
Room Temperature display
Shows the room temperature. The room
temperature display range is 8 - 39°C.
The display blinks if the temperature
is less than
8°C or 39°C or more.
Louver display
Indicates the action of the swing louver.
Does not appear if the louver is not
running.
(Power On indicator)
Indicates that the power is on.
Fan Speed indicator
Shows the selected fan speed.
Ventilation indicator
Appears when the unit is running in
Ventilation mode.
Displays if the airflow is set to
low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in one hour,
when the airflow direction also
changes.

55
SPECIFICATIONS
2
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): 5 m
*1 Measured under rated operating frequency
Specifications and rating conditions of main electric parts
SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH
Indoor service ref.
Function
Power supply Single phase
230V, 50Hz
600/540/480
10
0.35
75
0.014
0.19
PK6V15-LD
4
37/31/28
650/530/480
3
10
10
10
Cooling
90
Heating
93
Single phase
230V, 50Hz
660/540/480
10
0.40
85
0.014
0.26
PK6V20-LL
4
38/33/29
690/570/510
3
10
10
10
Cooling
94
Heating
94
Air flow
(High/Medium/Low)
Power outlet
Running current *1
Power input Rated frequency
Dew prevention heater
Power factor *1
Fan motor current *1
Model
Winding
resistance (at 26)
Width
Height
Depth
Weight
Air direction
Sound level(High/Medium/Low)
Fan speed(High/Medium/Low)
Fan speed regulator
Thermistor TH1(at 25)
Thermistor TH2(at 25)
Thermistor TH5(at 25)
*/h
A
A
W
(kW)
%
A

mm(in)
mm(in)
mm(in)
kg
dB(A)
rpm
k
k
k
Electrical data
Fan motor
Special remarks
Capacity
Dimensions
WHT-BLK : 407 BLK-BLU : 86
BLU-YLW : 30 BRN-RED : 165
UNIT : 570(22-7/16) PANEL : 650(25-9/16)
UNIT : 235(9-1/4) PANEL : 20(13/16)
UNIT : 570(22-7/16) PANEL : 650(25-9/16)
UNIT : 16.5 PANEL : 3
WHT-BLK : 393 BLK-BLU : 164
BLU-YLW : 47 BRN-RED : 319
SLZ-KA50VAQ.TH
Single phase
230V, 50Hz
660/540/480
20
0.65
85
0.014
0.27
PK6V20-LM
4
39/34/30
710/590/530
3
10
10
10
Cooling
97
Heating
97
WHT-BLK : 325 BLK-BLU : 143
BLU-YLW : 47 BRN-RED : 309
1.5440V
250V 6.3A
MSBPC20 12V 250
TO OUTDOOR UNIT : 3P TO WIRED REMOTE CONTROLLER : 2P
141$3
240V AC 15W
INDOOR UNIT
Item Service ref.
Indoor fan capacitor
Fuse
Vane motor
Terminal block
Indoor fan motor thermal fuse
Cord Heater
SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH
(C1)
(FUSE)
(MV)
(TB)
(H2)

6
NOISE CRITERION CURVES
UNIT
1.5 m
MICROPHONE
CEILING
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than the indicated level in actual use due to surrounding echoes. The sound level can be higher
by about 2 dB than the indicated level during cooling and heating operation.
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
SLZ-KA50VAQ.TH High
Medium 39
SPL(dB)
34
LINE
<50Hz>
NOTCH
Low 30
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
SLZ-KA25VAQ.TH High
Medium 37
SPL(dB)
31
LINE
<50Hz>
NOTCH
Low 28
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
SLZ-KA35VAQ.TH High
Medium 38
SPL(dB)
33
LINE
<50Hz>
NOTCH
Low 29

77
OUTLINES AND DIMENSIONS
3
(Case of Wired remote controller)
Terminal block Terminal block
Suspension bolt
M10 or 3/8
(procure locally)
Refrigerent
pipe (liquid)
Refrigerent
pipe (gas)
Grille
Drain pipe
VP-25 connection
(O.D. W32)
Suspension bolt lower edge
230
18248
Wiring entry
Ceiling surface
235
208
27 +5
0193
20
93
38~58
66121
17 202
87
15~37 15~37
576~620
570
530
Fresh air
intake
56 57
31
Ceiling hole
Suspension bolt pitch
15~37 15~37576~620
420 570 335
199
352
335
Suspension bolt
pitch
Ceiling hole
Brand label
Vane motor
Drain hole
V/M
Air intake grille
55 35
35 55
Auto vane
Grille
Air intake hole
Air intake hole
Air outlet hole
Air outlet hole
301
301 377
377
650
650
V/M
V/M
V/M
Detail drawing of fresh air intake
Ceiling surface
Cut out hole
W73.4
Burring hole
3- W2.8 hole
W100
118
25
120°
120°
Emergency operation switch(cooling)
Emergency operation switch(heating)
Operation lamp
DEFROST/STAND BY lamp
(WIRELESS PANEL)
Receiver
SLZ-KA50VAQ
SLZ-KA35VAQ
SLZ-KA25VAQ
1/4 F
flared connection
W6.35mm
1/4 F
flared connection
W6.35mm W9.52mm
flared connection
3/8 F
1/2 F
flared connection
Models
W6.35mm
flared connection
1/4 F
Refrigerent pipe
(liquid) Refrigerent pipe
(gas)
W12.7mm
W9.52mm
flared connection
3/8 F
Unit : mm
SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH

8
WIRED REMOTE CONTROLLER Unit : mm
130
19
120
43.5
(Option)

99
WIRING DIAGRAM
4
SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH

10
5REFRIGERANT SYSTEM DIAGRAM
Pipe temperature
thermistor/liquid
(TH2)
Distributor
with strainer
#50
Condenser/evaporator
temperature thermistor
(TH5)
Room temperature
thermistor (TH1)
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer
#50
Strainer
#50
Heat exchanger Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)
SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH