Mitsubishi EHST20C-VM2C Service Manual page 22

6-8. EHST20C-YM9CR1.UK, EHST20C-YM9ECR1.UK, EHPT20X-YM9CR1.UK, EHST20D-YM9CR1.UK
Power supply
to Booster heater
3~ 400V 50Hz
L1 L2 L3
(1) (3) (5)
ECB1
2 4 6
1 3 5 A1
BHCP
A2
2 4 6
BHC1
BHC2
1 3 5 A1 1 3 5 A1
2 4 6 A2 2 4 6 A2
2 2 2
BH1 BH2
BHF BHT
2
1
2
CNBHT
3
(BK)
1
2
CNBC
3
(GY)
1
2
3
CNBH
2 5
(WH)
7
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 service.
Table 1 Signal Inputs
Name Terminal block Connector Item
Room thermostat 1
IN1 TBI.1 13-14 —
input
IN2 TBI.1 11-12 — Flow switch 1 input
Flow switch 2 input
IN3 TBI.1 9-10 —
(Zone1)
IN4 TBI.1 7-8 — Demand control input Normal
Outdoor thermostat
IN5 TBI.1 5-6 —
input *1
Room thermostat 2
IN6 TBI.1 3-4 —
input
Flow switch 3 input
IN7 TBI.1 1-2 —
(Zone2)
Electric energy meter
IN8 TBI.3 1-2 —
1
Electric energy meter
IN9 TBI.3 3-4 —
2
IN10 TBI.3 5-6 — Heat meter
IN1A TBI.3 12-14 CN1A Flow sensor
*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.
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
BH2 Booster heater 2
BHC1 Contactor for booster heater 1
BHC2 Contactor for booster heater 2
OCH570C
Immersion heater (1Ph3kW)(Option)
Power supply
to Immersion heater
~/N 230V 50Hz
L N
(1) (3) CNPWM
(WH)
1
3
ECB2
3
CNP1
2 4
TBO.1
(WH)
1
M 1
1~
2
MP1 3
M
3
1~
IHC M
1 3 5 A1
2WV2b 1~
4
MP2
5
M
6
1~
MP3
1
2 4 6 A2
M
1~
3
MP4
CNP4
(RD)
A B
TBO.2
Close
1
M N
1~ Open 2
MXV
3
1
IHT 4
M 3
IH
1~ 5
5
3WV
6
CNV1
(WH)
TBO.3
X10
1
Signal output
(Boiler)
2
2
Signal output 3
1
CNIH (Error)
4
3
(OG) X12
Signal output 5
(Defrost)
6
X15
Signal output 7
(Comp. ON)
8
TBO.4
X13
1
CNIH
M
(OG)
2
2WV2a
3
1
4
3
Signal output 5
(Cooling)
6
1
3
CNBHT
(BK)
CNBC
(GY)
:
1
3
1
3
5
7
CNBH
(WH)
OFF (Open) ON (Short)
Refer to SW2-1 in
<6-19. DIP switch functions>.
Refer to SW2-2 in
<6-19. DIP switch functions>.
Refer to SW3-2 in
<6-19. DIP switch functions>.
Heat source OFF/
Boiler operation *2
Standard opera- Heater operation/
tion Boiler operation *2
Refer to SW3-1 in
<6-19. DIP switch functions>.
Refer to SW3-3 in
<6-19. DIP switch functions>.
Refer to installation manual.
Symbol
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)
1 <How to use TBO.1 to 4>
2 Connect them using either way as shown below.
4
F1
6
Tool
CN01
F2 (WH)
Conductor
X1
Outline view
X2
X3
TBO.1
1
2
CNP1
3 1
X14
(WH)
4 3
5
6 F2
IEC T6.3AL250V
1
1 CNP4
1 TBO.2
3 (RD)
2
X5A
3 SW5
4
5 8
LED1
X5B
6 1
1
X4 CNV1
TBO.3 3
1
(WH) SW4
5
2
6
3
1
4
5
SW3
6
LED2
7
8
8
1
TBO.4
X11 1
LED3
2
SW2
3
4
8
5
1
1
6 CNIH
(OG)
3
SW1
1 1
CNBC CNBHT
8
(GY) (BK)
3 3
X9
1
LED4
CNBH
X8
(WH)
7
CN1A CNW5 CNW12
(WH) (WH) (RD)
1
1
2
4
2 4 6 8 10 12 14 2 4 6 8 10 12 14 2
1 3 5 7 9 11 13 1 3 5 7 9 11 13 1 3
TBI.1 TBI.3
X6
X7
TBI.1
1 2 3 4 5 6 7 8
1 2 1 4 1 3 1 2
t ° t ° t ° t ° t °
Table 2 Outputs
Name Terminal block Connector
Water circulation pump 1 output (Space heating/
OUT1 TBO.1 1-2 CNP1
cooling & DHW)
Water circulation pump 2 output (Space heating/
OUT2 TBO.1 3-4 —
cooling for Zone1)
Water circulation pump 3 output (Space heating/
cooling 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
OUT8 TBO.4 5-6 — Cooling signal 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.
Name
22
Indoor unit powered
Indoor unit powered
via outdoor unit by independent source
To outdoor Power supply
unit
~/N 230V 50Hz
Tool
L N S1 S2 S3 L N
TB1
Conductor
Top view
BK
1
BK
BK
CN01 2
BK
(WH) 4
1
6
1
2
CN01 CN01 2
(WH) 4 (WH)
4
F1 6
6
IEC T10AL250V
1
CN3C
BN
(BU)
1 1
3 CN3C CN3C
(BU) OG (BU)
3 3
1
CNPWM
(WH)
3
CNRF
Wireless receiver
(WH)
(Option)
CN105 WiFi adapter
(RD) (Option)
CNIT
(BU)
CN22 1
(BU)
2
CN108
CN21 CN20
(YE) (RD)
1
1
1
2
3
4
4 6 8 10 12 14
5 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
CN1A
(BU)
(WH)
1 4
1 2
t
°
Item
Symbol Name
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)
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
To outdoor
unit
S1 S2 S3
TB1
BN
OG
4 5 6 7 8 9 10 11 12 13 14
t 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