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6-3. EHST20C-VM2CR2.UK, EHST20C-VM2ECR2.UK, EHST20D-VM2CR2.UK, EHPT20X-VM2CR2.UK,
EHST20D-VM2ECR2.UK, ERST20C-VM2CR2.UK, ERST20D-VM2CR2.UK
Power supply
Immersion heater (1Ph3kW)(Option)
to Booster heater
Power supply
~/N 230V 50Hz
to Immersion heater
~/N 230V 50Hz
L
N
L
N
(1)
(3)
(1)
(3)
ECB1
ECB2
2 4
2 4
IHC
1
3
1
3
5
A1
BHCP
2
4
6
A2
2
4
BHC1
1
3
5
A1
A B
2
4
6
A2
IH
BH1
2
2
BHF
BHT
2
1
2
CNBHT
3
(BK)
1
2
CNBC
3
(GY)
1
2
3
CNBH
(WH)
Symbol
Name
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 pump 1
(Space heating/cooling & DHW)
MP2
Water circulation pump 2
(Space heating/cooling for Zone1)(Local supply)
MP3
Water circulation pump 3
(Space heating/cooling for Zone2)(Local supply)
MP4
Water circulation pump 4 (DHW)
3WV
3-way valve
2WV2a
2-way valve (For Zone 1)(Local supply)
2WV2b
2-way valve (For Zone 2)(Local supply)
MXV
Mixing valve (Local supply)
BHT
Thermostat for booster heater
BHF
Thermal fuse for booster heater
BH1
Booster heater 1
BHC1
Contactor for booster heater 1
BHCP
Contactor for booster heater protection
IHT
Thermostat (fixed temp.) for immersion heater
IH
Immersion heater
IHC
Contactor for immersion heater
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 (Local supply)
IN2
Flow switch 1 (Local supply)
IN3
Flow switch 2 (Local supply)
IN4
Demand control (Local supply)
IN5
Outdoor thermostat (Local supply)
IN6
Room thermostat 2 (Local supply)
IN7
Flow switch 3 (Local supply)
IN8
Electric energy meter 1 (Local supply)
IN9
Electric energy meter 2 (Local supply)
IN10
Heat meter (Local supply)
IN11
Smart grid ready input (Local supply)
IN12
IN1A
Flow sensor
FLOW TEMP. CONTROLLER (FTC5)
TBO.1-4 Terminal block <Outputs>
TBI.1-3 Terminal block <Signal Inputs, Thermistor>
F1
Fuse (IEC T10AL250V)
F2
Fuse (IEC T6.3AL250V)
SW1-5
DIP switch *See 6-19. DIP switch functions.
X1-15
Relay
LED1
Power supply (FTC5)
LED2
Power supply (Main remote controller)
LED3
Communication (FTC5-Outdoor unit)
LED4
Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108
SD card connector
OCH570C
CNPWM
(WH)
1
3
3
CNP1
TBO.1
(WH)
X1
1
M
1
1~
2
MP1
3
M
X2
3
1~
M
5
A1
2WV2b
1~
4
MP2
X3
5
M
6
1~
MP3
X14
1
6
A2
M
1~
3
MP4
CNP4
(RD)
TBO.2
X5A
Close
1
M
N
2
1~
Open
MXV
X5B
3
1
X4
IHT
4
M
3
1~
5
5
3WV
6
CNV1
(WH)
TBO.3
X10
1
Signal output
(Boiler)
2
2
X11
3
Signal output
1
CNIH
(Error)
4
3
(OG)
X12
5
Signal output
(Defrost)
6
X15
Signal output
7
(Comp. ON)
8
TBO.4
X13
1
CNIH
M
(OG)
2
2WV2a
X9
1
3
3
4
X8
5
Signal output
(Cooling)
6
1
3
CNBHT
(BK)
CNBC
(GY)
1
3
X6
1
3
X7
5
7
CNBH
(WH)
Table 1 Signal Inputs
Name Terminal block Connector
IN1
TBI.1 13-14
IN2
TBI.1 11-12
IN3
TBI.1 9-10
IN4
TBI.1 7-8
IN5
TBI.1 5-6
IN6
TBI.1 3-4
IN7
TBI.1 1-2
IN8
TBI.3 1-2
IN9
TBI.3 3-4
IN10
TBI.3 5-6
IN11
TBI.3 7-8
IN12
TBI.3 9-10
IN1A TBI.3 12-14 CN1A Flow sensor
*1. Set the ON/OFF cycle time of the room thermostat for 10 minutes or more; otherwise the compressor may be
damaged.
*2. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and related parts may
be reduced.
*3. To turn on the boiler operation, use the main remote controller to select "Boiler" in "External input setting" screen
in the service menu.
Table 2 Outputs
Name Terminal block Connector
OUT1
TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling & DHW)
OUT2
TBO.1 3-4
OUT3
TBO.1 5-6
OUT4
TBO.2 4-6 CNV1 3-way valve output
TBO.2 1-2
OUT5
TBO.2 2-3
OUT6
OUT7
OUT8
TBO.4 5-6
OUT9
TBO.4 3-4 CNIH Immersion heater output
OUT10 TBO.3 1-2
OUT11 TBO.3 3-4
OUT12 TBO.3 5-6
OUT13 TBO.4 1-2
OUT14
OUT15 TBO.3 7-8
Do not connect to the terminals that are indicated as "—" in the "Terminal block" field.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
1
<How to use TBO.1 to 4>
2
Connect them using either way as shown below.
4
F1
6
Tool
CN01
(WH)
F2
Conductor
Conductor
Outline view
Top view
1
TBO.1
2
3
1
CNP1
(WH)
4
3
5
6
F2
IEC T6.3AL250V
IEC T10AL250V
1
CNP4
1
TBO.2
1
(RD)
3
2
SW5
3
4
5
8
LED1
6
1
1
CNV1
CNPWM
TBO.3
3
1
SW4
(WH)
(WH)
5
2
6
3
1
4
CNRF
5
(WH)
SW3
6
LED2
7
8
8
1
CN105
TBO.4
1
(RD)
LED3
2
SW2
3
4
8
CNIT
5
(BU)
1
1
6
CNIH
(OG)
3
SW1
CN22
(BU)
1
1
CNBC
CNBHT
8
(GY)
(BK)
3
3
1
LED4
CNBH
(WH)
7
CN1A
CNW5
CNW12
CN21
(WH)
(WH)
(RD)
(YE)
1
1
1
1
2
3
4
4
2
4
6
8
10
12 14
2
4
6
8
10
12 14
2
4
6
8
10
1
3
5
7
9
11
13
1
3
5
7
9
11
13
1
3
5
7
9
TBI.1
TBI.3
TBI.2
TBI.1
1
2
3
4
5
6
7
8
9
10
11
1
2
1
4
1
3
1
2
t
°
t
°
t
°
t
°
t
°
Item
—
Room thermostat 1 input *1 Refer to SW2-1 in <6-19. DIP switch functions>.
—
Flow switch 1 input
—
Flow switch 2 input (Zone1) Refer to SW3-2 in <6-19. DIP switch functions>.
—
Demand control input
—
Outdoor thermostat input *2 Standard operation Heater operation/ Boiler operation *3
—
Room thermostat 2 input *1 Refer to SW3-1 in <6-19. DIP switch functions>.
—
Flow switch 3 input (Zone2) Refer to SW3-3 in <6-19. DIP switch functions>.
—
Electric energy meter 1
—
Electric energy meter 2
—
Heat meter
—
Smart grid ready input
—
—
Water circulation pump 2 output (Space heating/cooling for Zone1)
Water circulation pump 3 output (Space heating/cooling for Zone2) *1
—
2-way valve 2b output *2
—
Mixing valve output *1
—
CNBH 1-3 Booster heater 1 output
—
CNBH 5-7 Booster heater 2 output
—
Cooling signal output
—
Boiler output
—
Error output
—
Defrost output
—
2-way valve 2a output *2
—
CNP4 Water circulation pump 4 output (DHW)
—
Comp. ON signal
17
Indoor unit powered
Indoor unit powered
by independent source
via outdoor unit
To outdoor
To outdoor
Power supply
unit
unit
~/N 230V 50Hz
Tool
L
N
S1
S2
S3
TB1
L
N
S1
S2
BK
1
BK
BK
CN01
2
BK
(WH)
4
6
1
1
2
CN01
CN01
2
(WH)
4
(WH)
4
F1
6
6
1
CN3C
BN
BN
(BU)
1
1
3
CN3C
CN3C
OG
OG
(BU)
(BU)
3
3
1
3
1. S ymbols used in wiring diagram
Wireless receiver
(Option)
are,
: connector,
WiFi adapter
terminal block.
(Option)
2. Indoor unit and outdoor unit
connecting wires have polarities,
make sure to match terminal
1
2
numbers (S1, S2, S3) for correct
CN108
wirings.
3. Since the outdoor unit side electric
wiring may change, be sure to
CN20
check the outdoor unit electric
(RD)
1
wiring diagram for service.
2
12 14
11
13
TBI.3
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
+ - + - + -
CN22
CN1A
(BU)
(WH)
1
4
1
2
t
t
°
°
OFF (Open)
ON (Short)
Refer to SW2-2 in <6-19. DIP switch functions>.
Normal
Heat source OFF/ Boiler operation *3
Refer to installation manual.
Item
S3
TB1
:
7
8
9
10
11
12
13
14
t
t
t
t
°
°
°
°
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Heating
DHW
Close
Stop
Open
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Normal
Error
Normal Defrost
OFF
ON
OFF
ON
OFF
ON
- Quick Links:
- Reference Manual
- Specifications
- Technical Drawings
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Troubleshooting
