Mitsubishi EHST20C-VM2C Service Manual page 27

6-13. EHST20C-MEC.UK, EHST20D-MEC.UK, ERST20C-MEC.UK, ERST20D-MEC.UK, EHST20D-MHC.UK
Immersion heater (1Ph3kW)(Option)
Power supply
to Immersion heater
~/N 230V 50Hz
L N
(1) (3)
ECB2
2 4
IHC
1 3 5 A1
A2
2 4 6
A B
IHT
IH
2
1
CNIH
3
(ORN)
1. S ymbols used in wiring diagram are,
: terminal block.
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>
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)
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
OCH570C
F1
CNPWM
(WHT)
1
F2
3
3
CNP1
TBO.1
(WHT)
X1
1
1
M
1~
2
3
M MP1
X2
3
1~
M
2WV2b
1~ 4
MP2 X3
5
TBO.1
M 1
6
1~
2
MP3
3
X14
1
4
M
1~ 5
3
MP4
6
CNP4
(RED)
TBO.2
1
2
TBO.2 X5A
3
Close
1
4
M N
1~ Open 2 5
X5B
MXV 6
3
X4
1
4 1 TBO.3
M
2
1~ 5
5 3
3WV
6
CNV1
4
(WHT)
5
6
TBO.3
7
X10
1
Signal output
8
(Boiler)
2
TBO.4
X11 1
3
Signal output
2
(Error)
4
3
X12
5 4
Signal output
(Defrost) 5
6
X15 6
7
Signal output
(Comp ON)
8
TBO.4
1
CNBC
X13
1
CNIH (GRY)
3
M
(ORN)
2
2WV2a X9
1 3
1
4
3
CNBH
X8
5 (WHT)
Signal output
(Cooling)
6
7
1
3
CNBHT
(BLK)
CNBC
(GRY)
2 4
1
1 3
3
X6
1
3
X7
5
7
CNBH
(WHT)
: connector,
1 2
t
°
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 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
OUT8
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
6
Tool
CN01
(WHT)
Conductor
Conductor
Outline view Top view
CN01
(WHT)
1 CNP1
(WHT)
3
F2
6.3A 250V 10A 250V
1 CNP4 1
(RED)
3
SW5
CN3C
(BLU)
8
LED1
1
1
CNPWM
CNV1
SW4
(WHT) (WHT)
5
6
1
CNRF
(WHT)
SW3
LED2
8
1 CN105
(RED)
LED3
SW2
CNIT
8
(BLU)
1
1
CNIH
(ORN)
3
SW1
CN22
(BLU)
1
CNBHT
8
(BLK)
CN108
3
LED4
CN1A CNW5 CNW12 CN21
(WHT) (WHT) (RED) (YLW)
1 1
1
1
2
3
4 4
6 8 10 12 14 2 4 6 8 10 12 14 2 4 6 8 10 12 14
5 7 9 11 13 1 3 5 7 9 11 13 1 3 5 7 9 11
TBI.1 TBI.3 TBI.2
TBI.1
1 2 3 4 5 6 7 8 9 10 11 12
1 4 1 3 1 2
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/cooling & DHW)
TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling for Zone1)
Water circulation pump 3 output (Space heating/cooling 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 5-6 — Cooling signal 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
27
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 N
BLK
1
BLK
BLK
2
BLK
4
1
6
1
2
CN01 CN01 2
(WHT) 4 (WHT)
4
F1 6
6
1
BRN
1 1
3 CN3C CN3C
(BLU) ORN (BLU)
3 3
1
3
Wireless receiver
(Option)
WiFi adapter
(Option)
1
2
CN20
(RED)
1
2
13
TBI.3
13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3
+ - + - + -
CN22
(BLU)
1 2
t
°
OFF (Open)
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
To outdoor
unit
S1 S2 S3 TB1
BRN
ORN
4 5 6 7 8 9 10 11 12 13 14
t t t t t
° ° ° ° °
ON (Short)
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