Table 1 Signal Inputs
Name Terminal block Connector
Item
OFF (Open)
ON (Short)
IN1
TBI.1 1-2
—
Room thermostat 1 input
Refer to SW2-1 in <6-13 Dip switch setting>
IN2
TBI.1 3-4
CN2F
Flow switch 1 input
Refer to SW2-2 in <6-13 Dip switch setting>
IN3
TBI.1 5-6
—
Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-13 Dip switch setting>
IN4
TBI.1 7-8
—
Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5
TBI.1 9-10
—
Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6
TBI.1 11-12
—
Room thermostat 2 input
Refer to SW3-1 in <6-13 Dip switch setting>
IN7
TBI.1 13-14
—
Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-13 Dip switch setting>
*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 Connector
Item
OFF
ON
OUT1 TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW)
OFF
ON
OUT2 TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1)
OFF
ON
OUT3 TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2)
OFF
ON
OUT4 TBO.1 9-11
CNV1
3-way valve output
Heating
DHW
OUT5 TBO.1 12-13
—
Mixing valve output
Stop
Close
TBO.1 13-14
Stop
Open
OUT6 —
CNBH 1-3 Booster heater 1 output
OFF
ON
OUT7 —
CNBH 5-7 Booster heater 2 output
OFF
ON
OUT8 TBO.2 11-12
—
Booster heater 2+ output
OFF
ON
OUT9 TBO.2 9-10
CNIH
Immersion heater output
OFF
ON
OUT10 TBO.1 1-2
—
Boiler output
OFF
ON
OUT11 TBO.2 1-2
—
Error output
Normal
Error
OUT12 TBO.2 3-4
—
Defrost output
Normal
Defrost
Symbol
Name
Symbol
Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1
Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2
Thermistor (Ref. liquid temp.)
ECB2
Earth leakage circuit breaker for immersion heater
THW1
Thermistor (Flow water temp.)
MP1
Water circulation pump1(Space heating & DHW) THW2
Thermistor (Return water temp.)
MP2
Water circulation pump2
(Space heating for Zone1)(Field supply)
THW5
Thermistor (DHW tank water temp.)
THW6
Thermistor (Zone1 flow temp.)(Option)
MP3
Water circulation pump3
(Space heating for Zone2)(Field supply)
THW7
Thermistor (Zone1 return temp.)(Option)
THW8
Thermistor (Zone2 flow temp.)(Option)
3WV
3-way valve
THW9
Thermistor (Zone2 return temp.)(Option)
MXV
Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT
Thermostat for booster heater
THWB2 Thermistor (Boiler return temp.)(Option)
BHF
Thermal fuse for booster heater
IN1
Room thermostat 1 (Field supply)
BH1
Booster heater 1
IN2
Flow switch 1
BH2
Booster heater 2
IN3
Flow switch 2 (Field supply)
BHC1
Contactor for booster heater 1
IN4
Demand control (Field supply)
BHC2
Contactor for booster heater 2
IN5
Outdoor thermostat (Field supply)
BHCP
Contactor for booster heater protection
IN6
Room thermostat 2 (Field supply)
IHT
Thermostat (fixed temp.) for immersion heater
IN7
Flow switch 3 (Field supply)
IH
Immersion heater
FLOW TEMP. CONTROLLER (FTC4)
IHC
Contactor for immersion heater
TBO.1~2 Terminal block <Outputs>
TBI.1~2 Terminal block <Signal Inputs, Thermistor>
F1~F2 Fuse (T6.3AL250V)
SW1~4 Dip switch *See <6-13 Dip switch setting>.
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,
: terminal block.
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.
EHST20C-VM6HB WIRING DIAGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
2
2 2 2
ECB1
L
(1)
N
(3)
L
(1)
N
(3)
ECB2
BHCP
ORN
RED
BLU
BLU
BLU
BLU
RED
RED
BLU
BLU/No.3
WHT/No.2
WHT/No.1
BLU/No.4
RED
RED
V
LT
V
LT
PNK
PNK
G
R
Y
G
R
Y
ORN
BHC2
IHC
BHC1
BHT
IHT
IH
6
4
2
5
3
1
A1
A2
6
4
2
5
3
1
A1
A2
6
4
2
5
3
1
A1
A2
BH1
A B
BHF
BH2
2 4
2 4
Power supply
to Immersion heater
~/N 230V 50Hz
Power supply
to Booster heater
~/N 230V 50Hz
2
2
2
2
1
3
5
7
1
5
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
)
3WV
M
1~
MXV
M
1~
M
1~
MP2
M
1~
MP3
MP1
M
1~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
CNV1
(WHT)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
6
4
2
5
3
1
A1
A2
Open
Close
N
3
N
L
S3
S2
S1
N
L
S3
S2
S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
Y
LW
BLK
BLK
YL
W
GRN/Y
LW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YL
W
GRN/Y
LW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
Y
LW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12
6
10
14
8
13
7
11
9
4
5
3
2
6
9
5
2
1
TBI.2
12
10
14
8
13
7
11
4
3
1
1 3
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
1
8
SW3
1
8
SW1
LED1
LED3
1
1
8
6
SW2
SW4
TBI.1
13
10
12
14
11
7
4
6
5
9
3
2
8
1
TBI.2
13
10
12
14
11
7
4
6
5
9
3
2
8
1
1
2
CN20 (RED)
TH1
1
3
CN21 (Y
LW)
TH2
1
4
THW1
1
2
1
3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°
t°
THWB2
THWB1
THW8
t°
THW6
t°
THW7
t°
THW9
t°
Main
controller
1
2
THW2
THW5
CNW5 (WHT)
CNW12 (RED)
t°
t°
t°
t°
t°
1
3
1
7
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
1
3
1
3
CNBH
(WHT)
CNBHT
(BLK)
1
3
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
10
11
6-1. EHST20C-VM6HB
6
WIRING DIAGRAM
OCH531
Содержание ecodan EHPT20X- VM2HB
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