Mitsubishi Electric EHST20C-VM2C.UK Service Manual page 14

6-5. EHST20C-MEC, EHST20D-MEC, EHST20D-MHC
Immersion heater (1Ph3kW)(Option)
Power supply
to Immersion heater
~/N 230V 50Hz
L N
(1) (3)
ECB2
2 4
IHC 1 3 5
A1
2 4 6 A2
A B
IHT
IH
2
1
CNIH
3
(ORN)
1. Symbols used in wiring diagram are,
: 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
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
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
X3
MP2
5
TBO.1
M 1
1~ 6
2
MP3
3
X14
1
4
M
5
1~
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 TBO.3
1
M
2
1~ 5
3WV 5 3
6
CNV1
4
(WHT)
5
6
TBO.3
7
X10
1
Signal output 8
(Boiler)
2
TBO.4
1
X11
3
Signal output
2
(Error)
4
3
X12
5 4
Signal output
(Defrost) 5
6
X15 6
Signal output 7
(Comp ON)
8
TBO.4
1
CNBC
X13
1
CNIH (GRY)
M 3
(ORN)
2
2WV2a X9
3
1 1
3 4
CNBH
X8
5 (WHT)
6
7
1
3
CNBHT
(BLK)
CNBC
(GRY)
2
1
1 3
3
X6
1
3
X7
5
7
CNBH
(WHT)
: connector,
1
t °
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
6
Tool
CN01
(WHT)
Conductor
Conductor
Outline view Top view
CNP1
1
(WHT)
3
F2
6.3A 250V
1 1
CNP4
3 (RED)
SW5
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)
3
LED4
CN1A CNW5 CNW12 CN21
(WHT) (WHT) (RED) (YLW)
1 1
1
1
2
3
4 4
4 6 8 10 12 14 2 4 6 8 10 12 14 2 4 6 8
5 7 9 11 13 1 3 5 7 9 11 13 1 3 5 7 9
TBI.1 TBI.3 TBI.2
TBI.1
1 2 3 4 5 6 7 8 9 10 11
2 1 4 1 3 1 2
t ° t ° t ° t °
Symbol
TB1
ECB2
MP1
MP2
ON (Short)
MP3
MP4
3WV
2WV2a
2WV2b
MXV
IHT
IH
IHC
Symbol
TH1
TH2
THW1
THW2
THW5
THW6
THW7
THW8
OFF ON
THW9
OFF ON
THWB1
OFF ON THWB2
IN1
OFF ON
IN2
IN3
Heating DHW
IN4
Close
IN5
Stop
IN6
Open
IN7
OFF ON
IN8
OFF ON
IN9
OFF ON
IN10
OFF ON FLOW TEMP. CONTROLLER (FTC5)
TBO.1-4 Terminal block <Outputs>
Normal Error
TBI.1-3 Terminal block <Signal Inputs, Thermistor>
Normal Defrost
F1
OFF ON
F2
OFF ON
SW1-5
X1-15
OFF ON
LED1
LED2
LED3
LED4
CNPWM Pump speed control signal for MP1
14
CN108
Indoor unit powered
by independent source
via outdoor unit
To outdoor
Power supply
unit ~/N 230V 50Hz
Tool
L N S1 S2 S3
TB1
BLK
1
BLK
CN01 2
(WHT)
4
1
6
2
CN01 CN01
(WHT) 4 (WHT)
F1 6
10A 250V
1
CN3C
BRN
(BLU)
1
3 CN3C CN3C
(BLU) ORN (BLU)
3
1
3
Wireless receiver
(Option)
WiFi adapter
(Option)
1
2
CN108
CN20
(RED)
1
2
10 12 14
11 13
TBI.3
12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1
+ - + - + -
CN22
(BLU)
1
Name
Terminal block <Power supply, Outdoor unit>
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 (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
Indoor unit powered
To outdoor
unit
L N S1 S2 S3
TB1
BLK
BLK
1
2
4
6
BRN
1
ORN
3
2 3 4 5 6 7 8 9 10 11 12 13 14
2
t ° t ° t ° t ° t ° t °