Mitsubishi EHPT20X-MHCW, Service Manual

Page: 15 / 108

15
6 WIRING DIAGRAM
6-1. EHST20C-VM2C.UK, EHST20C-VM2EC.UK, EHST20D-VM2C.UK, EHPT20X-VM2C.UK,
EHST20D-VM2EC.UK, ERST20C-VM2C.UK, ERST20D-VM2C.UK
1
3
5
7
X6
X7
1
3
1
3
CNBHT
(BLK)
CNBC
(GRY)
CNBH
(WHT)
N L S3 S2 S1 N L S3 S2 S1
To outdoor
unit
TB1
ORN
ORN
Y
LW
YLW
GRN/YL
W
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU RED BLU RED YLW
GRN/YL
W
1
3
CN3C
(BLU)
BLK
BLK
BLK
BLK
1
3
ORN
BRN
CN3C
(BLU)
ORN
ORN
BRN
Y
LW
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BLU)
1
3
CNPWM
(WHT)
LED1
LED2
LED3
LED4
TBI.1 TBI.2
13 10 12 14 11 7 4 6 5 9 3 2 8 1 13 10 12 14 11 7 4 6 5 9 3 2 8 1 13 10 12 14 11 7 4 6 5 9 3 2 8 1
IN6 IN1 IN2 IN3 IN4 IN5 IN7
THW8 THW7 THW6 THW9
THWB1 THWB2
t° t° t° t° t° t°
Main
controller
1
+ - + - + -
2 1 2
CN20 (RED)
TH1
t°
1 3
CN21 (YL
W)
TH2
t°
1 4
THW1 THW2
CNW12 (RED)
t° t°
1 2
THW5
CNW5 (WHT)
t°
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WHT)
CN105
(RED)
CN22
(BLU)
1
5
Close
Open
N
X15
X12
TBO.3
TBO.2
TBO.1
F1
F2
MXV
M
1~
MP2
MP1
M
1~
CNV1
(WHT)
X11
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WHT)
CNP4
(RED)
CNPWM
(WHT)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WHT)
CNP4
(RED)
CNV1
(WHT)
CN22
(BLU)
CNIT
(BLU)
TAB1
CN01
(WHT)
F2 F1
6.3A 250V 10A 250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
5
1
3
1
3
8
1
8
1
6
CN01
(WHT)
CN01
(WHT)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WHT)
CNBC
(GRY)
1
1
3
1
2 1
2
1
2
CNBHT
(BLK)
1
3
7
1
3
CNIH
(ORN)
1
4
1
3
CNW5
(WHT)
CN21
(YLW)
CNW12
(RED)
CN20
(RED)
TBI.2
MP3
M
1~
IN8 IN9
IN10
TBI.3
TBI.3
1
4
CN1A
(WHT)
TBI.1
2WV2b
M
1~ M
1~
MP4
M
1~
1
3
L
(1)
N
(3)
ORN
RED
BLU
BLU
RED
ORN
IHC
IHT
IH
6 4 2
5 3 1 A1
A2
A B
2 4
Immersion heater (1Ph3kW)(Option)
Power supply
to Immersion heater
~/N 230V 50Hz
1
2
CNIH
(ORN)
3
3WV
M
1~
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp ON)
Signal output
(Cooling)
ECB2
1
2
4
6
CN01
(WHT)
WHT WHT
2 2
2
ECB1
L
(1)
N
(3)
BHCP
BLU
BLU RED
WHT/No.2 WHT/No.1
RED
V
LT
V
LT
G
RY
G
RY
BHC1
BHT
6 4 2
5 3 1 A1
A2
BH1
BHF
2 4
Power supply
to Booster heater
6 4 2
5 3 1 A1
A2
CNBH
(WHT)
CNBHT
(BLK)
2
2
2
CNBC
(GRY)
1
1
3
3
1
3
~/N 230V 50Hz
1
2
3
4
5
6
TBO.4
M
2WV2a
1
3
X9
X8
X13
CNIH
(ORN)
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
12 14 6 10 8
13 7 11 9
4
5 3
2
1
12 14 6 10 8
13 7 11 9
4
5 3
2
1
12 14 6 10 8
13 7 11 9
4
5 3
2
1
Tool
Tool
Conductor
Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
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 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
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)
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 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
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 OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input Refer to SW2-1 in <6-19. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <6-19. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <6-19. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/ Boiler operation *2
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 Refer to SW3-1 in <6-19. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <6-19. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy meter 1
Refer to installation manual. 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 Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling & DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling for Zone1) OFF ON
OUT3 TBO.1 5-6 —
Water circulation pump 3 output (Space heating/cooling for Zone2) *1
OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve output Heating DHW
OUT5
TBO.2 1-2
— Mixing valve output *1 Stop
Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp ON signal OFF ON
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.
OCH570C