Mitsubishi Electric EHST20C-VM6HB Service Manual page 12

EHST20C-YM9HB WIRING DIAGRAM
6-2. EHST20C-YM9HB
Power supply
Power supply
to Booster heater
to Immersion heater
~/N 230V 50Hz 3~ 400V 50Hz
L N L1 L2 L3
(1) (3) (1) (3) (5)
ECB2 ECB1
2 4 2 4 6
1 3 5
A1
BHCP
2 4 6 A2
BHC1
IHC
1 3 5 A1 1 3 5 1 3 5
A1 A1
2 4 6 A2 2 4 6 A2 2 4 6 A2
A B
IHT
IH
BH1 BH2
BHF BHT
2 2
Table 1 Signal Inputs
Name Terminal block
IN1 TBI.1 1-2
IN2 TBI.1 3-4
IN3 TBI.1 5-6
IN4 TBI.1 7-8
IN5 TBI.1 9-10
IN6 TBI.1 11-12
IN7 TBI.1 13-14
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select "Boiler" in "External/input setting"
screen in the service menu.
Table 2 Outputs
Name Terminal block
OUT1 TBO.1 3-4
OUT2 TBO.1 5-6
OUT3 TBO.1 7-8
OUT4 TBO.1 9-11
TBO.1 12-13
OUT5
TBO.1 13-14
OUT6 —
OUT7 —
OUT8 TBO.2 11-12
OUT9 TBO.2 9-10
OUT10 TBO.1 1-2
OUT11 TBO.2 1-2
OUT12 TBO.2 3-4
Symbol
TB1 Terminal block <Power supply, Outdoor unit>
ECB1 Earth leakage circuit breaker for booster heater
ECB2 Earth leakage circuit breaker for immersion heater
MP1 Water circulation pump1(Space heating & DHW)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
3WV 3-way valve
MXV Mixing valve (Field supply)
BHT Thermostat for booster heater
BHF Thermal fuse for booster heater
BH1 Booster heater 1
BH2 Booster heater 2
BHC1 Contactor for booster heater 1
BHC2 Contactor for booster heater 2
BHCP Contactor for booster heater protection
IHT Thermostat (fixed temp.) for immersion heater
IH Immersion heater
IHC Contactor for immersion heater
OCH531
Signal
output
(Boiler)
CNPWM
(WHT)
1
3
X10
3
1
CNP1
2
(WHT)
1 X1
3
M
1 ~
4
3
MP1
BHC2 X2
5
M
1 ~
6
MP2 X3
7
M
8
1 ~
X4
9
MP3
10
1
M
11
X5A
1 ~
3WV 5 12
CNV1
13
(WHT)
Close
14
M
N
X5B
1 ~ Open
MXV
TBO.2
X11
Signal
1
2 2 2
output
2
(Error)
Signal
X12
output 3
(Defrost)
4
5
6
7
8
X9
1
2
9
3
10
X8
CNIH
11
(ORN)
Signal
12
output
13
(Booster
heater2+)
14
1
2
3 CNBHT(BLK)
CNBH
(WHT)
X6
2
1
3
X7
2
5
7
2
1
3
CNBC
(GRY)
1
t °
Connector Item OFF (Open)
— Room thermostat 1 input Refer to SW2-1 in
CN2F Flow switch 1 input Refer to SW2-2 in
— Flow switch 2 input (Zone1) Refer to SW3-2 in
— Demand control input Normal
— Outdoor thermostat input *1 Standard operation
— Room thermostat 2 input Refer to SW3-1 in
— Flow switch 3 input (Zone2) Refer to SW3-3 in
Connector Item
CNP1 Water circulation pump 1 output (Space heating & DHW)
— Water circulation pump 2 output (Space heating for Zone1)
— Water circulation pump 3 output (Space heating for Zone2)
CNV1 3-way valve output
— Mixing valve output
CNBH 1-3 Booster heater 1 output
CNBH 5-7 Booster heater 2 output
— Booster heater 2+ output
CNIH Immersion heater output
— Boiler output
— Error output
— Defrost output
Name Symbol
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 flow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler flow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Field supply)
IN2 Flow switch 1
IN3 Flow switch 2 (Field supply)
IN4 Demand control (Field supply)
IN5 Outdoor thermostat (Field supply)
IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
CN01
(BLK)
F1
5
3
F2
1
CNP1(WHT)
1 3
1
TBO.1
2
3
1
4 CNV1
5
(WHT)
6
5
7
8
9
FTC4
10
11
12
13
14
TBO.2
1
2
LED3
3
4
5
6
7
8
9
10
11
1
12
CNPWM
13
(WHT)
3
14
LED2
1
CNBH
CNIH
(WHT)
(ORN)
3 1
7
CN22
CNBC 1
CNBHT
(BLU)
(GRY)
(BLK) 2
3 1
3 1
CN2F CN20 CN21 CNW12 CNW5
LED1
(YLW) (RED) (YLW) (RED) (WHT)
1 1 1
1 1
3 2 3 2
7
1
2 4 6 8 10 12 2 4 8 10 12 14
6
1 3 5 7 9 11 13 1 3 5 7 9
TBI.1 TBI.2
1
TBI.1
1 2 3 4 5 6 7 8 9 10
CN2F
(YLW)
2 1 3 1 4 1 2 1 3
t ° t ° t ° t °
ON (Short)
<6-13 Dip switch setting>
<6-13 Dip switch setting>
<6-13 Dip switch setting>
Heat source OFF/Boiler operation *2
Heater operation/Boiler operation *2
<6-13 Dip switch setting>
<6-13 Dip switch setting>
OFF ON
OFF ON
OFF ON
OFF ON
Heating DHW
Stop Close
Stop Open
OFF ON
OFF ON
OFF ON
OFF ON
OFF ON
Normal Error
Normal Defrost
FLOW TEMP. CONTROLLER (FTC4)
Name
TBO.1~2 Terminal block <Outputs>
TBI.1~2 Terminal block <Signal Inputs, Thermistor>
F1~F2 Fuse (T6.3AL250V)
SW1~4 Dip switch *See
X1~X12 Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
1. Symbols used in wiring diagram are,
: connector,
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
1
Cylinder unit powered
via outdoor unit
To outdoor
unit
L N S1 S2 S3 TB1
BLK
CN01
CN01 (BLK)
5
(BLK)
5
3
3
1
1
CN3C
(BLU)
BRN
1
1
CN3C
ORN
(BLU)
3 3
CN105
(RED)
CNRF
(WHT)
LED4
CN108
SW4
1 6
SW2 SW1
8 1 8
SW3
8
TBI.2
11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14
CN22
(BLU)
1 2
t t t t t t
° ° ° ° ° °
<6-13 Dip switch setting>
: terminal block.
Cylinder unit powered
by independent source.
To outdoor
Power supply
unit
~/N 230V 50Hz
L N S1 S2 S3 TB1
BLK
CN01
(BLK)
5
3
1
CN3C
(BLU)
BRN
1
ORN
3
Figure 1