Mitsubishi SEZ-KA35VA.TH Operating manual

Home > Products > M Series > R410A Ceiling Concealed Ducted System > Inverter Heat Pump >
R410A Ceiling Concealed Ducted System
SEZ-KA60VA Indoor Unit
Capacity (kW):
Heating (Nominal) (Low
- High) 6.90 (0.90 - 8.00)
Cooling (Nominal) (Low
- High) 5.50 (1.10 - 6.30)
Heating (UK) (Low -
High) 5.75 (0.75 - 6.65)
Cooling (UK) (Low -
High) 5.45 (1.10 - 6.25)
SHF R410A (Nominal) 0.75
COP / EER (Nominal) 2.82 / 2.81
Energy Label Heating /
Cooling C / D
Width - mm 1100
Depth - mm 700
Height - mm 270
Weight - kg 33.5
Airflow (m3/min)
(Heating / Cooling) -
Lo-Hi 12-20 / 12-20
SEZ-KA60VAInverter Heat Pump
Designed for homes, offices, restaurants or shops, the SEZ series operates at
low noise levels and is virtually invisible when installed within a suspended
ceiling. Its low unit height and lightweight design also helps to make
installation easier and more convenient.
Hover your mouse over the red icons below to view a description of each feature:
Model Info
[Print]
[Print]
Dimensions
SEZ-KA60VA (Click to
enlarge).
SUZ-KA60VA (Click to
enlarge).

External Static
Pressure Pa(mmAq) -
Lo-Hi 30(3)-50(5)
Noise (dBA) (Heating /
Cooling) - Lo-Hi 32-43 / 32-43
Pipe Size Gas mm (in) 15.88 (5/8)
Pipe Size Liquid mm
(in) 6.35 (1/4)
Electrical Supply Fed by Outdoor Unit
Phase Single
Fuse Rating (BS88) -
HRC (A) 6
Interconnecting Cable
No. Cores 4
Remote Controller Ref PAR-21MAA
SUZ-KA60VA Outdoor Unit
Width - mm 840
Depth - mm 330
Height - mm 850
Weight - kg 53
Noise (dBA) (Heating /
Cooling) 52 / 52
Electrical Supply 220-240v, 50Hz
Phase Single
Fuse Rating (BS88) - HRC
(A) 25
System Power Input (kW) -
Heating (Nominal) 2.45
System Power Input (kW) -
Cooling (Nominal) 1.96
System Power Input (kW) -
Heating (UK) 2.23
System Power Input (kW) -
Cooling (UK) 1.57
Starting Current (A) 10.4
System Running Current
(A) - Heating / Cooling 10.4 / 9
Mains Cable No. Cores 3
Max Pipe Length (m) 30
Max Height Difference (m) 15
Charge (kg) - 7m 1.8

TECHNICAL & SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS········2
2. SPECIFICATIONS·································4
3. OUTLINES AND DIMENSIONS············8
4. WIRING DIAGRAM·······························9
5. REFRIGERANT SYSTEM DIAGRAM ······10
6. TROUBLESHOOTING························11
7. DISASSEMBLY PROCEDURE···········15
8. PARTS LIST········································18
9. OPTIONAL PARTS·············Back Cover
INDOOR UNIT
Indoor unit
[Model names] [Service Ref.]
SEZ-KA35VA SEZ-KA35VA.TH
SEZ-KA50VA SEZ-KA50VA.TH
SEZ-KA60VA SEZ-KA60VA.TH
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
WIRED REMOTE
CONTROLLER
ON/OFF
TEMP.
Model name
indication
No.OC321
Note :
•This manual does not cover
outdoor units. When servicing
outdoor units, please refer
to the service manual
No.OC322 together with this
manual.
OC321-A-1.qxp 05.2.24 8:54 AM Page 1

2
1PART NAMES AND FUNCTIONS
Indoor Unit
SEZ-KA35VA.TH
SEZ-KA50VA.TH
SEZ-KA60VA.TH
Air outlet duct flange
Air outlet
Air inlet
(Selecting the either back side or bottom side)
● Operation buttons
On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
Wired remote controller
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.
OC321-A-1.qxp 05.2.24 8:54 AM Page 2

3
●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 re-
mote 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, shows the time
remaining.
“Sensor” indication
Displayed when the remote controller
sensor is used.
“Locked” indicator
Indicates that remote controller but-
tons 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 corre-
sponding timer is set.
Up/Down Air Direction indica-
tor
The indicator shows the direc-
tion of the outcoming airflow.
“One Hour Only” indicator
Displayed if the airflow is set to
weak and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di-
rection 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 display lights when the unit is stopped and power supplied to the unit.
●When power is turned ON for the first time the (Centrally controlled) display appears to go off momentarily but this is not a
malfunction.
●“NOT AVAILABLE” is displayed when the Air speed button are pressed.This indicates that this room unit is not equipped
with the fan direction adjustment function and the louver function.
●When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indica-
tion (For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.
OC321-A-1.qxp 05.2.24 8:54 AM Page 3

4
2SPECIFICATIONS
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
93
Heating
94
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
97
Heating
98
Air flow (High/Low)
Power outlet
Running current ✽1
Power input Rated frequency
Auxiliary heater
Power factor ✽1
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
WHT-BLK : 166 BLK-BLU : 52
BLU-YLW : 19 YLW-BRN : 8
BRN-RED : 40
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. 5:
Outdoor D.B. 7:W.B. 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
SEZ-KA35/50VA.TH : 2.5+ 440V SEZ-KA60VA.TH : 3.0+ 440V
250V 6.3A
ERZV10D471
TO OUTDOOR UNIT : 3P TO WIRED REMOTE CONTROLLER : 2P
145:i2:
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
(C1)
(FUSE)
(ZNR)
(TB)
Specifications and rating conditions of main electric parts
OC321-A-1.qxp 05.2.24 8:54 AM Page 4

5
SEZ-KA60VA.TH
Indoor model
Function
Power supply Single phase
230V, 50Hz
1200/720
20
0.65
100
—
0.39
PK6V50-EF
1100o270o700
33.5
1
43/32
890/660
3
Std : 30 Max : 50
10
10
10
Cooling
98
Heating
98
Air flow (High/Low)
Power outlet
Running current ✽1
Power input Rated frequency
Auxiliary heater
Power factor ✽1
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 : 103 BLK-BLU : 57
BLU-YLW : 15 YLW-BRN : 7
BRN-RED : 29
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.
OC321-A-1.qxp 05.2.24 8:54 AM Page 5

6
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 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.
OC321-A-1.qxp 05.2.24 8:54 AM Page 6

7
Air flow (K/X)
Recommended range
80
60
40
20
0105 7 15 20 25
External static pressure(Pa) (1Pa = 0.1mmAq)
Fan Performance
Air flow (K/X)
Recommended range
80
60
40
20
0155 10 20 25
External static pressure(Pa) (1Pa = 0.1mmAq)
Fan Performance
Air flow (K/X)
Recommended range
80
60
40
20
0155 10 20 25
External static pressure(Pa) (1Pa = 0.1mmAq)
Fan Performance
SEZ-KA50VA.TH
SEZ-KA60VA.TH
SEZ-KA35VA.TH Corrected Air flow
1.1
0.9
1.0
0.8 105 15 20
Correction factor
Capacity
Input
Cooling
Air flow (K/X)
Corrected Airflow
1.1
0.9
1.0
0.8 5 10 15 20 25
Correction factor
Capacity
Input
Cooling
Air flow (K/X)
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)
1.0
1.1
1.2
0.8
0.9
5 10 15 20 25
Correction factor
Heating
Air flow (K/X)
1.0
1.2
1.3
1.1
0.8
0.9
5 10 15 20
Correction factor
Heating
Air flow (K/X)
25
25
INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW
OC321-A-1.qxp 05.2.24 8:54 AM Page 7

8
OUTLINES AND DIMENSIONS
3
SEZ-KA35VA.TH
SEZ-KA50VA.TH
SEZ-KA60VA.TH
Unit : mm
(10) 50
50 880
7x100=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
7x100=700
100
77.5
12012.5
(Inlet size)
24-{2.9 holes
5027
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) x2
After installation, remove the
transportation support PLATE (B).
25 (Inlet size)
215
450150 Electrical parts box
wSelect 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
7x100=700
100
77.5
(Inlet size)
215
Air inlet (bottom side) dimensions
24-{2.9 holes
flared connection
{6.35mm
Electrical parts box
2x2-{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
wSelect 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)
OC321-A-1.qxp 05.2.24 8:54 AM Page 8