Wiring Diagram - Mitsubishi Electric EHST20C-VM2C.UK Service Manual

Cylinder unit
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6

WIRING DIAGRAM

6-1. EHST20C-VM2C, EHST20C-VM2EC, EHST20D-VM2C, EHPT20X-VM2C
Power supply
Immersion heater (1Ph3kW)(Option)
to Booster heater
~/N 230V 50Hz
L
N
(1)
(3)
ECB1
ECB2
2 4
IHC
1
3
5
A1
BHCP
2
4
6
A2
BHC1
1
3
5
A1
2
4
6
A2
IH
BH1
2
2
BHT
BHF
2
1
2
CNBHT
3
(BLK)
1
2
CNBC
3
(GRY)
1
2
3
CNBH
(WHT)
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)
X1
1
M
1
1~
2
M
MP1
3
X2
3
1~
1
3
5
M
A1
2WV2b
1~
4
MP2
X3
5
M
1~
6
MP3
X14
1
2
4
6
A2
M
1~
MP4
3
CNP4
(RED)
A B
TBO.2
X5A
Close
1
M
N
1~
Open
2
MXV
X5B
3
X4
1
IHT
4
M
1~
5
3WV
5
6
CNV1
(WHT)
TBO.3
X10
1
Signal output
(Boiler)
2
2
X11
3
1
Signal output
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
3
4
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
F2
(WHT)
Conductor
Outline view
Top view
TBO.1
1
2
3
1
CNP1
(WHT)
4
3
5
6
F2
6.3A 250V
1
CNP4
1
TBO.2
1
3
(RED)
2
3
SW5
4
5
8
LED1
6
1
1
CNV1
1
TBO.3
SW4
(WHT)
5
2
6
3
1
4
5
6
SW3
LED2
7
8
8
1
TBO.4
1
LED3
2
SW2
3
4
8
5
1
1
6
CNIH
(ORN)
3
SW1
1
1
CNBC
CNBHT
8
(GRY)
(BLK)
3
3
1
LED4
CNBH
(WHT)
7
CN1A
CNW5
CNW12
(WHT)
(WHT)
(RED)
1
1
1
2
4
4
2
4
6
8
10
12 14
2
4
6
8
10
12 14
2
4
1
3
5
7
9
11
13
1
3
5
7
9
11
13
1
3
5
TBI.1
TBI.3
TBI.1
1
2
3
4
5
6
7
8
1
2
1
4
1
3
1
2
t
t
t
t
t
°
°
°
°
°
Symbol
TB1
ECB1
ECB2
MP1
ON (Short)
MP2
MP3
MP4
3WV
2WV2a
2WV2b
MXV
BHT
BHF
BH1
BHC1
BHCP
IHT
IH
IHC
Symbol
TH1
TH2
THW1
OFF
ON
THW2
OFF
ON
THW5
OFF
ON
THW6
THW7
THW8
OFF
ON
THW9
THWB1
Heating
DHW
THWB2
Close
IN1
Stop
IN2
Open
IN3
OFF
ON
IN4
OFF
ON
IN5
OFF
ON
IN6
OFF
ON
IN7
IN8
Normal
Error
IN9
Normal Defrost
IN10
OFF
ON
FLOW TEMP. CONTROLLER (FTC5)
OFF
ON
TBO.1-4 Terminal block <Outputs>
OFF
ON
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
CN108
10
Indoor unit powered
Indoor unit powered
by independent source
via outdoor unit
To outdoor
Power supply
unit
~/N 230V 50Hz
Tool
L
N
S1
S2
S3
TB1
L
Conductor
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
(BLU)
1
1
3
CN3C
CN3C
ORN
(BLU)
(BLU)
3
3
1
CNPWM
(WHT)
3
CNRF
Wireless receiver
(WHT)
(Option)
CN105
WiFi adapter
(Option)
(RED)
CNIT
(BLU)
CN22
1
(BLU)
2
CN108
CN21
CN20
(YLW)
(RED)
1
1
2
3
6
8
10
12 14
7
9
11
13
TBI.2
TBI.3
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
+ - + - + -
CN22
(BLU)
1
2
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
Contactor for booster heater 1
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
To outdoor
unit
N
S1
S2
S3
TB1
BRN
ORN
4
5
6
7
8
9
10
11
12
13
14
t
t
t
t
t
°
°
°
°
°

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