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6-4. EHST20C-TM9C, EHPT20X-TM9C
Power supply
Immersion heater (1Ph3kW)(Option)
to Booster heater
3~ 230V 50Hz
L1
L2
L3
(1)
(3)
(5)
ECB1
ECB2
2 4 6
IHC
1
3
5
A1
BHCP
A2
2
4
6
BHC1
1
3
5
1
3
5
BHC2
A1
A1
2
4
6
A2
2
4
6
A2
2
2
2
BH1
BH2
BHT
BHF
2
1
2
CNBHT
3
(BLK)
1
2
CNBC
3
(GRY)
1
2
3
CNBH
5
2
(WHT)
7
1. Symbols used in wiring diagram are,
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 service.
Table 1 Signal Inputs
Name Terminal block Connector
Item
IN1
TBI.1 13-14
—
Room thermostat 1 input
IN2
TBI.1 11-12
—
Flow switch 1 input
IN3
TBI.1 9-10
—
Flow switch 2 input (Zone1) Refer to SW3-2 in <6-7. DIP switch setting>.
IN4
TBI.1 7-8
—
Demand control input
IN5
TBI.1 5-6
—
Outdoor thermostat input *1 Standard operation Heater operation/ Boiler operation *2
IN6
TBI.1 3-4
—
Room thermostat 2 input
IN7
TBI.1 1-2
—
Flow switch 3 input (Zone2) Refer to SW3-3 in <6-7. DIP switch setting>.
IN8
TBI.3 1-2
—
Electric energy meter 1
IN9
TBI.3 3-4
—
Electric energy meter 2
IN10
TBI.3 5-6
—
Heat meter
*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
OUT1
TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating & DHW)
OUT2
TBO.1 3-4
—
Water circulation pump 2 output (Space heating for Zone1)
Water circulation pump 3 output (Space heating for Zone2) *1
OUT3
TBO.1 5-6
—
2-way valve 2b output *2
OUT4
TBO.2 4-6 CNV1 3-way valve output
TBO.2 1-2
OUT5
—
Mixing valve output *1
TBO.2 2-3
OUT6
—
CNBH 1-3 Booster heater 1 output
OUT7
—
CNBH 5-7 Booster heater 2 output
OUT9
TBO.4 3-4 CNIH Immersion heater output
OUT10 TBO.3 1-2
—
Boiler output
OUT11 TBO.3 3-4
—
Error output
OUT12 TBO.3 5-6
—
Defrost output
OUT13 TBO.4 1-2
—
2-way valve 2a output *2
OUT14
—
CNP4 Water circulation pump 4 output (DHW)
OUT15 TBO.3 7-8
—
Comp ON signal
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.
OCH570
Power supply
to Immersion heater
~/N 230V 50Hz
L
N
(1)
(3)
CNPWM
(WHT)
1
3
3
CNP1
2 4
TBO.1
(WHT)
1
X1
1
M
1~
2
M
MP1
3
X2
3
1~
1
3
5
M
A1
2WV2b
1~
4
MP2
X3
5
M
6
1~
MP3
X14
1
2
4
6
A2
M
1~
3
MP4
CNP4
(RED)
A B
TBO.2
X5A
Close
1
M
N
Open
2
1~
MXV
X5B
3
X4
1
IHT
4
M
IH
1~
5
3WV
5
6
CNV1
(WHT)
TBO.3
X10
1
Signal output
(Boiler)
2
2
X11
3
Signal output
1
CNIH
(Error)
4
3
(ORN)
X12
5
Signal output
(Defrost)
6
X15
7
Signal output
(Comp ON)
8
TBO.4
X13
1
CNIH
M
(ORN)
2
2WV2a
X9
3
1
4
3
X8
5
6
1
3
CNBHT
(BLK)
CNBC
(GRY)
1
3
X6
1
3
X7
5
7
CNBH
(WHT)
: connector,
: terminal
OFF (Open)
Refer to SW2-1 in <6-7. DIP switch setting>.
Refer to SW2-2 in <6-7. DIP switch setting>.
Normal
Heat source OFF/ Boiler operation *2
Refer to SW3-1 in <6-7. DIP switch setting>.
Refer to <6-7. DIP switch setting>.
Item
1
<How to use TBO.1 to 4>
2
Connect them using either way as shown below.
4
F1
6
Tool
CN01
(WHT)
F2
Conductor
Conductor
Outline view
Top view
1
TBO.1
2
3
CNP1
1
(WHT)
4
3
5
6
F2
6.3A 250V
1
1
TBO.2
CNP4
1
3
(RED)
2
3
SW5
4
8
5
LED1
6
1
1
CNV1
CNPWM
TBO.3
1
(WHT)
SW4
(WHT)
5
2
6
3
1
4
CNRF
5
(WHT)
SW3
6
LED2
7
8
8
1
CN105
1
TBO.4
(RED)
LED3
2
SW2
3
4
CNIT
8
5
(BLU)
1
1
6
CNIH
(ORN)
3
SW1
CN22
(BLU)
1
1
CNBC
CNBHT
8
(GRY)
(BLK)
3
3
1
LED4
CNBH
(WHT)
7
CN1A
CNW5
CNW12
CN21
(WHT)
(WHT)
(RED)
(YLW)
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
1
3
5
7
9
11
13
1
3
5
7
9
11
13
1
3
5
7
9
TBI.2
TBI.1
TBI.3
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
°
Symbol
TB1
ECB1
ECB2
ON (Short)
MP1
MP2
MP3
MP4
3WV
2WV2a
2WV2b
MXV
BHT
BHF
BH1
BH2
BHC1
BHC2
BHCP
IHT
IH
IHC
Symbol
OFF
ON
TH1
OFF
ON
TH2
OFF
ON
THW1
THW2
OFF
ON
THW5
THW6
Heating
DHW
THW7
Close
THW8
Stop
Open
THW9
OFF
ON
THWB1
THWB2
OFF
ON
IN1
OFF
ON
IN2
OFF
ON
IN3
Normal
Error
IN4
Normal Defrost
IN5
IN6
OFF
ON
IN7
OFF
ON
IN8
OFF
ON
IN9
IN10
FLOW TEMP. CONTROLLER (FTC5)
TBO.1-4 Terminal block <Outputs>
TBI.1-3 Terminal block <Signal Inputs, Thermistor>
F1
F2
SW1-5
X1-15
LED1
LED2
LED3
LED4
CNPWM Pump speed control signal for MP1
13
CN108
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
BLK
1
BLK
BLK
CN01
2
BLK
(WHT)
4
6
1
1
2
CN01
CN01
2
(WHT)
4
(WHT)
4
F1
6
6
10A 250V
1
CN3C
BRN
BRN
(BLU)
1
1
3
CN3C
CN3C
ORN
ORN
(BLU)
(BLU)
3
3
1
3
Wireless receiver
(Option)
WiFi adapter
(Option)
1
2
CN108
CN20
(RED)
1
2
10
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
+ - + - + -
CN22
(BLU)
1
2
t
t
°
°
Name
Terminal block <Power supply, Outdoor unit>
Earth leakage circuit breaker for booster heater
Earth leakage circuit breaker for immersion heater
Water circulation pump 1(Space heating & DHW)
Water circulation pump 2 (Space heating for Zone1)(Local supply)
Water circulation pump 3 (Space heating for Zone2)(Local supply)
Water circulation pump 4 (DHW)
3-way valve
2-way valve (For Zone 1)(Local supply)
2-way valve (For Zone 2)(Local supply)
Mixing valve (Local supply)
Thermostat for booster heater
Thermal fuse for booster heater
Booster heater 1
Booster heater 2
Contactor for booster heater 1
Contactor for booster heater 2
Contactor for booster heater protection
Thermostat (fixed temp.) for immersion heater
Immersion heater
Contactor for immersion heater
Name
Thermistor (Room temp.)(Option)
Thermistor (Ref. liquid temp.)
Thermistor (Flow water temp.)
Thermistor (Return water temp.)
Thermistor (DHW tank water temp.)
Thermistor (Zone1 flow temp.)(Option)
Thermistor (Zone1 return temp.)(Option)
Thermistor (Zone2 flow temp.)(Option)
Thermistor (Zone2 return temp.)(Option)
Thermistor (Boiler flow temp.)(Option)
Thermistor (Boiler return temp.)(Option)
Room thermostat 1 (Local supply)
Flow switch 1 (Local supply)
Flow switch 2 (Local supply)
Demand control (Local supply)
Outdoor thermostat (Local supply)
Room thermostat 2 (Local supply)
Flow switch 3 (Local supply)
Electric energy meter 1 (Local supply)
Electric energy meter 2 (Local supply)
Heat meter (Local supply)
Fuse (T10AL250V)
Fuse (T6.3AL250V)
DIP switch *See 6-7. DIP switch setting.
Relay
Power supply (FTC5)
Power supply (Main controller)
Communication (FTC5-Outdoor unit)
Reading or writing data to SD card
SD card connector
S3
TB1
6
7
8
9
10
11
12
13
14
t
t
t
t
°
°
°
°
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