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Mitsubishi Electric EHST20C-VM6HB Service Manual page 19

Cylinder unit
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EHPT20X-VM6HB WIRING DIAGRAM
6-9. EHPT20X-VM6HB
Power supply
Power supply
to Booster heater
to Immersion heater
~/N 230V 50Hz
~/N 230V 50Hz
L
N
L
N
(1)
(3)
(1)
(3)
ECB2
ECB1
2 4
2 4
1
3
5
A1
BHCP
A2
2
4
6
BHC1
IHC
1
3
5
1
3
5
1
3
5
BHC2
A1
A1
A1
A2
2
4
6
A2
2
4
6
A2
2
4
6
A B
BH1
BH2
IHT
2
IH
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
F1
Signal
output
(Boiler)
F2
CNPWM
(WHT)
1
3
TBO.1
X10
3
1
CNP1
2
(WHT)
1
X1
3
M
1~
4
3
MP1
X2
5
M
1~
6
MP2
X3
7
M
8
1~
X4
MP3
9
10
1
M
11
1~
X5A
3WV
5
12
CNV1
(WHT)
13
Close
14
M
N
X5B
1~
Open
MXV
TBO.2
X11
Signal
1
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
(Booster
13
heater2+)
14
2
1
3
CNBHT(BLK)
CNBH
(WHT)
X6
2
1
3
X7
2
5
7
2
1
3
CNBC
(GRY)
1
2
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)
THW1
Thermistor (Flow water temp.)
THW2
Thermistor (Return water temp.)
THW5
Thermistor (DHW tank water temp.)
THW6
Thermistor (Zone 1 flow temp.)(Option)
THW7
Thermistor (Zone 1 return temp.)(Option)
THW8
Thermistor (Zone 2 flow temp.)(Option)
THW9
Thermistor (Zone 2 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)
5
3
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
LED4
LED2
1
CNBH
CNIH
(WHT)
(ORN)
7
3
1
CN22
CNBC
CNBHT
1
(BLU)
(GRY)
(BLK)
2
3
1
3
1
SW4
CN2F
CN20
CN21
CNW12
CNW5
LED1
(YLW)
(RED)
(YLW)
(RED)
(WHT)
1
1
1
1
SW2
1
1
3
2
2
3
7
1
2
4
6
8
10
12
2
4
8
10
12
14
6
SW3
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
11
12
13
CN2F
(YLW)
1
4 1
2
1
3
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.
19
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)
CN108
6
SW1
8
1
8
8
TBI.2
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

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