Mitsubishi EHST20C-VM2C Service Manual page 28

6-14. EHST20C-MECR1.UK, EHST20D-MECR1.UK, EHST20D-MHCR1.UK, ERST20C-MECR1.UK, ERST20D-MECR1.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
2 4 6 A2
A B
IHT
IH
2
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
IN1 TBI.1 13-14 —
1 input
Flow switch 1
IN2 TBI.1 11-12 —
input
Flow switch 2
IN3 TBI.1 9-10 —
input (Zone1)
Demand control
IN4 TBI.1 7-8 —
input
Outdoor thermo-
IN5 TBI.1 5-6 —
stat input *1
Room thermostat
IN6 TBI.1 3-4 —
2 input
Flow switch 3
IN7 TBI.1 1-2 —
input (Zone2)
Electric energy
IN8 TBI.3 1-2 —
meter 1
Electric energy
IN9 TBI.3 3-4 —
meter 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>
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)
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.)
OCH570C
F1
CNPWM
(WH)
1
F2
3
3
CNP1
TBO.1
(WH)
X1
1
1
M
1~
2
MP1 3
M
X2
3
1~
M
2WV2b
1~ 4
X3
MP2
5
M 1
1~ 6
2
MP3
3
X14
1
4
M
1~ 5
3
MP4
6
CNP4
(RD)
1
2
TBO.2 X5A
3
Close
1
4
M
N
2
1~ Open 5
X5B
MXV 6
3
X4
1
4 1
M 3
2
1~ 5
5 3
3WV
6
CNV1
4
(WH)
5
6
TBO.3
7
X10
1
Signal output
8
(Boiler)
2
1
X11
3
1 Signal output
2
CNIH (Error)
4
3
3
(OG)
X12
5
Signal output 4
(Defrost) 5
6
X15 6
7
Signal output
(Comp. ON)
8
TBO.4 1
X13
1
CNIH
M 3
(OG)
2
2WV2a X9
1 3
1
3 4
X8
5
Signal output
(Cooling)
6
7
1
3
CNBHT
(BK)
CNBC
(GY)
1
1
3
X6
1
3
X7
5
7
CNBH
(WH)
1
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>.
Refer to SW3-2 in
<6-19. DIP switch functions>.
Heat source OFF/
Normal
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
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)
1
<How to use TBO.1 to 4>
2 Connect them using either way as shown below.
4
6 Tool
Tool
CN01
(WH)
Conductor
Conductor
Outline view Top view
1
CN01 2
TBO.1
(WH) 4
6
1 CNP1
(WH)
3
F2 F1
IEC T6.3AL250V IEC T10AL250V
1 1
TBO.2 CNP4
3 (RD)
SW5 1
CN3C
(BU)
3
8
LED1
1
1 1
CNPWM
CNV1
TBO.3 3
SW4 (WH)
(WH)
3
5
6
1
CNRF
(WHT)
SW3
LED2
8
1 CN105
TBO.4
(RD)
LED3
SW2
CNIT
8
(BU)
1
1
CNIH
(OG)
3
SW1
CN22 1
(BU)
1 2
CNBHT
CNBC
8
(GY) (BK)
CN108
3
LED4
CNBH
(WH)
CN1A CNW5 CNW12 CN21 CN20
(WH) (WH) (RD) (YE) (RD)
1 1
1
1 1
2 2
3
4 4
2 4 6 8 10 12 14 2 4 6 8 10 12 14 2 4 6 8 10 12 14
3 5 7 9 11 13 1 3 5 7 9 11 13 1 3 5 7 9 11 13
TBI.1 TBI.3 TBI.2
TBI.1
1 2 3 4 5 6 7 8 9 10 11 12 13
2
1 4 1 3 1 2
t t t t
° ° ° ° °
Table 2 Outputs
Name Terminal block Connector
Water circulation pump 1 output (Space heating/cool-
OUT1 TBO.1 1-2 CNP1
ing & DHW)
Water circulation pump 2 output (Space heating/cool-
OUT2 TBO.1 3-4 —
ing for Zone1)
Water circulation pump 3 output (Space heating/cool-
ing 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
28
Indoor unit powered Indoor unit powered
via outdoor unit by independent source
To outdoor To outdoor
Power supply
unit unit
~/N 230V 50Hz
L N S1 S2 S3 TB1 L N S1 S2 S3 TB1
BK
BK
BK
BK
1
1
2
CN01 CN01 2
(WH) 4 (WH)
4
6
6
BN BN
1 1
CN3C CN3C
OG OG
(BU) (BU)
3 3
Wireless receiver
(Option)
WiFi adapter
(Option)
TBI.3
14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8
+ - + - + -
CN22
CN1A
(BU)
(WH)
1 4 1 2
t t t
° ° °
Item
Symbol Name
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
9 10 11 12 13 14
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