Mitsubishi EHST20C-VM2C Service Manual page 24

6-10. EHST20C-TM9C.UK, EHPT20X-TM9C.UK
Power supply
Immersion heater (1Ph3kW)(Option)
to Booster heater
3~ 230V 50Hz
L1 L2 L3
(1) (3) (5)
ECB2
ECB1
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
IH
2 2 2
BH1 BH2
BHF BHT
2
1
2
CNBHT
3
(BLK)
1
2 CNBC
3
(GRY)
1
2
3
CNBH
5
2 (WHT)
7
1. S ymbols used in wiring diagram are,
2. I ndoor unit and outdoor unit connecting wires have polarities, make sure to match
terminal numbers (S1, S2, S3) for correct wirings,
3. S ince the outdoor unit side electric wiring may change, be sure to check the
outdoor unit electric wiring diagram for service.
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 & DHW)
MP2 Water circulation pump 2 (Space heating for Zone1)(Local supply)
MP3 Water circulation pump 3 (Space heating for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)
3WV 3-way valve
2WV2a 2-way valve (For Zone1)(Local supply)
2WV2b 2-way valve (For Zone2)(Local supply)
MXV Mixing valve (Local 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
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)
FLOW TEMP. CONTROLLER (FTC5)
TBO.1-4 Terminal block <Outputs>
TBI.1-3 Terminal block <Signal Inputs, Thermistor>
F1 Fuse (T10AL250V)
F2 Fuse (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
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
1
M
1~
2
M MP1 3
X2
3
1~
1 3 5 A1 M
2WV2b
1~
4
X3
MP2
5
M
6
1~
MP3
X14
1
A2
2 4 6
M
1~
3
MP4
CNP4
(RED)
A B
TBO.2 X5A
Close
1
M N
1~ Open 2
X5B
MXV
3
X4
1
IHT 4
M
1~ 5
5
3WV
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
Signal output 7
(Comp ON)
8
TBO.4
X13
1
CNIH
M
(ORN)
2
2WV2a X9
1 3
3 4
X8
5
6
1
3
CNBHT
(BLK)
CNBC
(GRY)
1
3
X6
1
3
X7
5
7
CNBH
(WHT)
: connector, : terminal block.
Table 1 Signal Inputs
Name Terminal block Connector
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
IN9
IN10
*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 remote controller to select "Boiler" in "External input setting" screen
in the service menu.
Table 2 Outputs
Name Terminal block Connector
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT9
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
F2 (WHT)
Conductor
Outline view Top view
TBO.1
1
2
3 CNP1
1
(WHT)
4 3
5
6 F2
6.3A 250V
1 1
TBO.2 CNP4
1
(RED)
3
2
3 SW5
4
5 8
LED1
6 1
1
CNV1
TBO.3
1
(WHT) SW4
5
2
6
3
1
4
5
SW3
6
LED2
7
8 8
1
1 TBO.4
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 6
1 3 5 7 9 11 13 1 3 5 7 9 11 13 1 3 5 7
TBI.2
TBI.1 TBI.3
TBI.1
1 2 3 4 5 6 7 8 9
1 2 1 4 1 3 1 2
t ° t ° t ° t ° t °
Item
TBI.1 13-14 — Room thermostat 1 input
TBI.1 11-12 — Flow switch 1 input
TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <6-19. DIP switch functions>.
TBI.1 7-8 — Demand control input
TBI.1 5-6 — Outdoor thermostat input *1 Standard operation Heater operation/ Boiler operation *2
TBI.1 3-4 — Room thermostat 2 input
TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <6-19. DIP switch functions>.
TBI.3 1-2 — Electric energy meter 1
TBI.3 3-4 — Electric energy meter 2
TBI.3 5-6 — Heat meter
TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating & DHW)
TBO.1 3-4 — Water circulation pump 2 output (Space heating for Zone1)
Water circulation pump 3 output (Space heating for Zone2) *1
TBO.1 5-6 —
2-way valve 2b output *2
TBO.2 4-6 CNV1 3-way valve output
TBO.2 1-2
— Mixing valve output *1
TBO.2 2-3
— CNBH 1-3 Booster heater 1 output
— CNBH 5-7 Booster heater 2 output
TBO.4 3-4 CNIH Immersion heater output
— Boiler output
— Error output
— Defrost output
— 2-way valve 2a output *2
— CNP4 Water circulation pump 4 output (DHW)
— Comp ON signal
24
Indoor unit powered
Indoor unit powered
by independent source
via outdoor unit
To outdoor To outdoor
Power supply
unit
~/N 230V 50Hz
Tool
L N S1 S2 S3 TB1 L N S1
Conductor
BLK
1
BLK
BLK
CN01 2
BLK
(WHT) 4
1
6
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
CNPWM
(WHT)
3
CNRF
Wireless receiver
(WHT)
(Option)
CN105 WiFi adapter
(RED) (Option)
CNIT
(BLU)
CN22
1
(BLU)
2
CN108
CN21 CN20
(YLW) (RED)
1
1
2
3
8 10 12 14
9 11 13
TBI.3
10 11 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
° °
OFF (Open) ON (Short)
Refer to SW2-1 in <6-19. DIP switch functions>.
Refer to SW2-2 in <6-19. DIP switch functions>.
Normal Heat source OFF/ Boiler operation *2
Refer to SW3-1 in <6-19. DIP switch functions>.
Refer to installation manual.
Item
unit
S2 S3 TB1
6 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
Normal Error
Normal Defrost
OFF ON
OFF ON
OFF ON