SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names] [Service Ref.]
SEZ-KA35VA SEZ-KA35VA.TH
September 2006
No.OC321
REVISED EDITION-B
Revision:
•RoHS PARTS LIST is added
in REVISED EDITION-B.
•Some descriptions have
been modified.
•Please void OC321
REVISED EDITION-A.
SEZ-KA50VA SEZ-KA50VA.TH
SEZ-KA60VA SEZ-KA60VA.TH
SEZ-KA71VA SEZ-KA71VA.TH
CONTENTS
1. PART NAMES AND FUNCTIONS········2
2. SPECIFICATIONS·································4
Model name
indication
INDOOR UNIT
3. OUTLINES AND DIMENSIONS············9
4. WIRING DIAGRAM ·····························10
5.
REFRIGERANT SYSTEM DIAGRAM
6. TROUBLESHOOTING························12
7. DISASSEMBLY PROCEDURE ···········22
8. PARTS LIST········································25
9. RoHS PARTS LIST ·····························27
10. OPTIONAL PARTS·····························29
Note:
• This manual describes only
service data of the indoor
units.When servicing outdoor units, please refer to
the service manual
No.OC322, OC323 together
with this manual.
• RoHS compliant products
have <G> mark on the spec
name plate.
• For servicing of RoHS
compliant products, refer
to the RoHS Parts List.
·······11
WIRED REMOTE
CONTROLLER
1
Air outlet duct flange
Air outlet
Air inlet
(Selecting the either back side or bottom side)
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
Set Temperature 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
door
Start/Stop button
Fan Speed button
Filter button
(<return sign> button)
Test Run button
Service button (Clear button)
Airflow Up/Down button
Louver button
( Operation button)
To preceding operation
number
Ventilation button
(
Operation button)
To next operation number
PART NAMES AND FUNCTIONS
Indoor Unit
SEZ-KA35VA.TH
SEZ-KA50VA.TH
SEZ-KA60VA.TH
SEZ-KA71VA.TH
Wired remote controller
Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
● Operation buttons
2
● Display
For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.
˚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
Identifies the current operation
Shows the operating mode, etc.
* Multilanguage display is sup-
ported.
“Centrally Controlled” indicator
Indicates that operation of the remote controller has been prohibited 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, shows the time
remaining.
“Sensor” indication
Displayed when the remote controller
sensor is used.
“Locked” indicator
Indicates that remote controller buttons have been locked.
“Clean The Filter” indicator
Comes on when it is time to clean the
filter.
Timer indicators
The indicator comes on if the corresponding timer is set.
Up/Down Air Direction indicator
The indicator shows the direction of the outcoming airflow.
“One Hour Only” indicator
Displayed if the airflow is set to
Low and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow direction also changes.
Room Temperature display
Shows the room temperature.
Louver display
Indicates the action of the swing
louver. Does not appear if the
louver is stationary.
(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.
Caution
● Only the Power on indicator lights when the unit is stopped and power supplied to the unit.
● If you press a button for a feature that is not installed in the indoor unit, the remote controller will display the “Not Available”
message.
If you are using the remote controller to operate multiple indoor units, this message will appear only if the feature is not
present at the parent unit.
● When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication (For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappears then start the operation.
3
2
SEZ-KA35VA.TH SEZ-KA50VA.TH
Indoor model
Function
Power supply
Single phase
230V, 50Hz
780/600
10
0.40
60
—
0.22
PK6V19-EF
1100o270o700
33.5
1
35/30
770/630
3
Std : 30 Max : 50
10
10
10
Cooling Heating
Single phase
230V, 50Hz
1020/720
20
0.55
80
—
0.27
PK6V32-EF
1100o270o700
33.5
1
39/31
840/640
3
Std : 30 Max : 50
10
10
10
Cooling
Heating
Air flow (High/Low)
Power outlet
Running current ✽1
Power input Rated frequency
Auxiliary heater
Fan motor current ✽1
Model
Winding
resistance (at20:)
Dimensions WoHoD
Weight
Air direction
Sound level (High/Low)
Fan speed (High/Low)
Fan speed regulator
External satatic pressure
Thermistor TH1 (at 25:)
Thermistor TH2 (at 25:)
Thermistor TH5 (at 25:)
K /h
A
A
W
A(kW)
A
"
mm
kg
dB(A)
rpm
Pa
k"
k"
k"
Electrical
data
Fan
motor
Special remarks
Capacity
WHT-BLK : 257 BLK-BLU : 20
BLU-YLW : 27 YLW-BRN : 14
BRN-RED : 51(at 26:)
WHT-BLK : 166 BLK-BLU : 52
BLU-YLW : 19 YLW-BRN : 8
BRN-RED : 40(at 26:)
SEZ-KA35/50VA.TH : 2.5+ 440V SEZ-KA60VA.TH : 3.0+ 440V SEZ-KA71VA.TH : 4.0+ 440V
250V 6.3A
ERZV10D471
TO OUTDOOR UNIT : 3P TO WIRED REMOTE CONTROLLER : 2P
141:i3:
INDOOR UNIT
Item
Model
Indoor fan capacitor
Fuse
Varistor
Terminal block
Indoor fan motor thermal fuse
SEZ-KA35VA.TH SEZ-KA50VA.TH SEZ-KA60VA.TH SEZ-KA71VA.TH
(C1)
(FUSE)
(ZNR)
(TB)
SPECIFICATIONS
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.
Specifications and rating conditions of main electric parts
4
Indoor model
SEZ-KA60VA.TH
SEZ-KA71VA.TH
Capacity
Air flow (High/Low)
Power outlet
Running current ✽1
Power input Rated frequency
data
Auxiliary heater
Electrical
Fan motor current ✽1
Model
Winding
Fan
motor
resistance
Dimensions WoHoD
Weight
Air direction
Sound level(High/Low)
Fan speed(High/Low)
Fan speed regulator
External satatic pressure
Thermistor TH1 (at 25:)
Thermistor TH2 (at 25:)
Special remarks
Thermistor TH5 (at 25:)
Function
Power supply
K /h
A
A
W
A(kW)
A
"
mm
kg
dB(A)
rpm
Pa
k"
k"
k"
Cooling Heating
Single phase
230V, 50Hz
1200/720
20
0.65
100
—
0.39
PK6V50-EF
WHT-BLK : 103 BLK-BLU : 57
BLU-YLW : 15 YLW-BRN : 7
BRN-RED : 29 (at 26:)
1100o270o700
33.5
1
43/32
890/660
3
Std : 30 Max : 50
10
10
10
Cooling Heating
Single phase
230V, 50Hz
1200/720
20
0.60
130
—
0.51
PK4V60-EA
WHT-BLK : 108 BLK-BLU : 29
BLU-YLW : 26 YLW-BRN : 14
at 26:
BRN-RED : 34 (
1100o270o700
35
1
43/32
1050/690
3
Std : 30 Max : 50
10
10
10
)
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.
5
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD 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
SEZ-KA50VA.TH
High
Low
39
SPL(dB)
31
LINE
<50Hz>
NOTCH
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD 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
SEZ-KA35VA.TH
High
Low
35
SPL(dB)
30
LINE
<50Hz>
NOTCH
NOISE CRITERION CURVES
UNIT
External static
pressure 30Pa
1.5m
MICROPHONE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD 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
SEZ-KA60VA.TH
SEZ-KA71VA.TH
High
Low
43
SPL(dB)
32
LINE
<50Hz>
NOTCH
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
6
INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW
SEZ-KA35VA.TH
80
60
40
20
External static pressure(Pa)
(1Pa = 0.1mmAq)
0
SEZ-KA50VA.TH
80
60
40
Fan Performance
Recommended range
105 7 15 20 25
Air flow (K/X)
Fan Performance
Recommended range
Corrected Air flow
1.1
1.0
0.9
Correction factor
0.8
1.3
1.2
1.1
1.0
Correction factor
0.9
0.8
Corrected Airflow
1.1
1.0
0.9
Correction factor
0.8
1.2
Capacity
Cooling
1051520
Air flow (K/X)
Heating
5101520
Air flow (K/X)
Cooling
510152025
Air flow (K/X)
Heating
Input
25
25
Capacity
Input
20
External static pressure(Pa)
(1Pa = 0.1mmAq)
0
15510 2025
Air flow (K/X)
1.1
1.0
0.9
Correction factor
0.8
510152025
Air flow (K/X)
7
INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW
Air flow (K/X)
Recommended range
80
60
40
20
0
15510 2025
External static pressure(Pa)
(1Pa = 0.1mmAq)
Fan Performance
SEZ-KA60VA.TH
SEZ-KA71VA.TH
Corrected Air flow
1.1
0.9
1.0
0.8
10 15 20 25 30
Correction factor
Capacity
Input
Cooling
Air flow (K/X)
0.9
1.0
1.2
1.1
1.3
10 15 20 25 30
Correction factor
Heating
Air flow (K/X)
Air flow (K/X)
Recommended range
80
60
40
20
0
15510 2025
External static pressure(Pa)
(1Pa = 0.1mmAq)
Fan Performance
Corrected Air flow
1.1
0.9
1.0
0.8
10 15 20 25 30
Correction factor
Capacity
Input
Cooling
Air flow (K/X)
0.9
1.0
1.2
1.1
1.3
10 15 20 25 30
Correction factor
Heating
Air flow (K/X)
8
3
(10) 50
50
880
7
x100=700
100
40
9 x 2-{2.9 holes
1000
50
38
60
680
350
Suspension
bolt pitch
In case of bottom side suction,
mount the PLATE (A) on the rear side.
Air inlet (rear side) dimensions
240
1016
42
930
back side or bottom side.
29
955
7
x100=700
100
77.5
12012.5
(Inlet size)
24-
{2.9 holes
50
27
Air inlet
(rear side)
Air outlet duct flange
120
12.5 240
(It is necessary to maintain a working
service area from the ceiling.)
150
32.5
25
(10) 50
77
600
700
Access door
Service space
Air outlet
Suspension bolt pitch
1070
(Suspension bolt pitch)
Electrical parts box
(1070)
20 or more30
20
PLATE (B) x 2
After installation, remove the
transportation support PLATE (B).
25
(Inlet size)
215
450150
Electrical parts box
w Select the either
SEZ-KA60VA
SEZ-KA50VA
Terminal block
3/8F
flared connection
{9.52mm
{6.35mm
flared connection
1/4F
Air outlet duct flange
51
25
930
(Inlet size)
39
955
7
x100=700
100
77.5
(Inlet size)
215
Air inlet (bottom side) dimensions
24-{2.9 holes
flared connection
{6.35mm
Electrical parts box
2
x2-{2.9
holes
flared connection
{15.88mm
5/8F
flared connection
1/2F
{12.7mm
Refrigerent pipe
(gas)
Refrigerent pipe
(liquid)
1/4F
flared connection
{6.35mm
SEZ-KA35VA
Models
Wiring entry
Refrigerent pipe (liquid)
Refrigerent pipe (gas)
Drain plug R1 (male)
108
94 80
25
350
1/4F
SEZ-KA71VA
flared connection
{9.52mm
flared connection
5/8F
{15.88mm
3/8F
w Select the either back side or bottom side.
Air inlet
(bottom side)
100
75 170
Suspension bolt
M10 or 3/8
(procure locally)
1100
270
Access door
PLATE (A)
OUTLINES AND DIMENSIONS
SEZ-KA35VA.TH
SEZ-KA50VA.TH
SEZ-KA60VA.TH
SEZ-KA71VA.TH
Unit : mm
9
4
SWE
OFF
ON
SW3
OFF
54321
ON
SW2
OFF
54321
ON
(POWER
BOARD)
CNDK
RED
RED
WHT
ZNR
FUSE
RED
BLU
CND
(POWER)
ORN
BLU
YLW
WHT
BRN
BLU
BLK
1234567
87654321
BLU
BRN
YLW
ORN
87123456
RED
BLK
RED
WHT
C1
MF
ORN
WHT
FAN
(FAN)
CN90
BLU
BLU
(REMOCON)
BLU
TO OUTDOOR
UNIT
S3
P.B
123
TB4
S1
S2
TB15
1
2
TO MA-REMOTE
CONTROLLER
DC8.7-13V
}
I.B
12
CN22
12
WHT
RED
(INTAKE)
(LIQUID)
CN20
CN21
122
TH1 TH2
13
(CONTROL)
CN3C
BLU
3
LED1
12
TRANS
DC13.1V
CN2S(WHT)
AC220-240V
CNSK(RED)
WHT
BLK
2
1
(POWER
BOARD)
CN2D
WHT
LED2
ORN
BLU
LED3
CN2L
CN32
CN51
CN41
X5
X5 X4
X4X6
X6
(2 PHASE)
CN29
BLK
1
TH5
311
54321
OFF
ON
KA60
54321
OFF
ON
KA71
<fig:w1>
MODELS
KA35
KA50
ON
OFF
12345
ON
OFF
12345
SW2
See fig:w1
SYMBOL NAME
CONNECTOR(WIRELESS)
Indoor Fan Motor(MF)
for 60Hz
4.Since the indoor fan motor(MF) is connected with 50Hz power,
if 60Hz power is used, change the wiring connection shown in
fig:w2.
wFor details on how to operate self-diagnosis,
refer to the technical manuals etc.
CN90
MF
C1
TB4
TB15
TH1
TH2
TH5
FAN MOTOR
CAPACITOR(FAN MOTOR)
TERMINAL BLOCK(INDOOR/OUTDOOR CONNECTING LINE)
TERMINAL BLOCK(REMOTE CONTROLLER
TRANSMISSION LINE)
ROOM TEMP.THERMISTOR
(0°C/15kΩ,25°C/5.4kΩ DETECT)
PIPE TEMP.THERMISTOR/LIQUID
(0°C/15kΩ,25°C/5.4kΩ DETECT)
COND./EVA.TEMP.THERMISTOR
(0°C/15kΩ,25°C/5.4kΩ DETECT)
:Connector, :Terminal(block).
1.Since the outdoor side electric wiring may change be sure to
check the outdoor unit electric wiring for servicing.
2.Indoor and outdoor connecting wires are made with polarities,make
wiring matching terminal numbers(S1,S2,S3).
NOTES:
3.Symbols used in wiring diagram above are,
FUSE(T6.3AL250V)
X6
X5
X4
ZNR
RELAY(FAN MOTOR Hi)
RELAY(FAN MOTOR LL)
RELAY(FAN MOTOR Lo)
VARISTOR
SWITCH(CAPACITY CODE)
SW3
SW2
SWE SWITCH(EMERGENCY OPERATION)
SWITCH(MODE SELECTION)
TRANSMISSION(INDOOR-OUTDOOR)
LED1
LED2
LED3
POWER SUPPLY(I.B)
POWER SUPPLY(I.B)
CN51
CENTRALLY CONTROL
FUSE
P.B
CONNECTOR(HA TERMINAL-A)
CONNECTOR(REMOTE SWITCH)
CONNECTOR(LOSSNAY)
CN41
CN32
CN2L
INDOOR CONTROLLER BOARD
INDOOR POWER BOARD
I.B
NAMESYMBOL
YELLOW
BLUE
BLUE
<fig:w2>
50
60
[LEGEND]
WIRING DIAGRAM
SEZ-KA35VA.TH
SEZ-KA50VA.TH
SEZ-KA60VA.TH
SEZ-KA71VA.TH
10