Mitsubishi EHST20C-VM2C Service Manual page 32

6-18. EHPT20X-MHCWR2.UK, EHST20C-MHCWR2.UK, EHST20D-MHCWR2.UK
Immersion heater (1Ph3kW)
Power supply
to Immersion heater
~/N 230V 50Hz
L N
(1) (3)
ECB2
2 4
M
1~
IHC
1 3 5 A1
2WV2b
M
1~
MP3
2 4 6 A2
A B
IHT
IH
Signal output
2
Signal output
1
CNIH
3
(OG)
Signal output
Signal output
(Comp. ON)
Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
ECB2 Earth leakage circuit breaker for immersion heater
MP1 Water circulation pump 1(Space heating & DHW)
MP2 Water circulation pump 2
(Space heating for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating 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.)
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)
IN11
Smart grid ready input (Local supply)
IN12
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
OCH570C
F1
CNPWM
(WH)
1
F2
3
3
CNP1
TBO.1
(WH)
X1
1
1
M
1~
2
MP1 3
X2
3
M
1~
4
X3
MP2
5
TBO.1
1
6
2
3
X14
1
4
M
1~ 5
3
MP4
6
CNP4
(RD)
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 3
2
1~ 5
3WV 5 3
6
CNV1
4
(WH)
5
6
TBO.3
7
X10
1
8
(Boiler)
2
1 TBO.4
X11
3
2
(Error)
4
3
X12
5
4
(Defrost) 5
6
X15 6
7
8
TBO.4 1
CNBC
X13
1
CNIH (GY)
M 3
(OG)
2
2WV2a X9
1 3 1
3 4
CNBH
X8
(WH)
5
6 7
1
3
CNBHT
(BK)
CNBC
(GY)
2 4 6
1
1 3 5
3
X6
1
3
X7
5
7
CNBH
(WH)
1 2 1
t ° t
Table 1 Signal Inputs
Name Terminal block Connector
IN1 TBI.1 13-14
IN2 TBI.1 11-12
IN3 TBI.1 9-10
IN4 TBI.1 7-8
IN5 TBI.1 5-6
IN6 TBI.1 3-4
IN7 TBI.1 1-2
IN8 TBI.3 1-2
IN9 TBI.3 3-4
IN10 TBI.3 5-6
IN11 TBI.3 7-8
IN12 TBI.3 9-10
IN1A TBI.3 12-14 CN1A Flow sensor
*1. Set the ON/OFF cycle time of the room thermostat for 10 minutes or more; otherwise the compressor may be damaged.
*2. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and related parts may be
reduced.
*3. To turn on the boiler operation, use the main remote 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
OUT3 TBO.1 5-6
OUT4 TBO.2 4-6 CNV1 3-way valve output
TBO.2 1-2
OUT5
TBO.2 2-3
OUT6 —
OUT7 —
OUT9 TBO.4 3-4 CNIH Immersion heater output
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
Tool
6
Tool
CN01
(WH)
Conductor
Conductor
Outline view Top view
CN01
(WH)
CNP1
1
(WH)
3
F2 F1
IEC T6.3AL250V IEC T10AL250V
1 1
CNP4
(RD)
3
SW5 1
CN3C
(BU)
3
8
LED1
1
1 1
CNV1 CNPWM
3
SW4 (WH)
(WH)
3
5
6
1
CNRF
(WH)
SW3
LED2
8
1 CN105
(RD)
LED3
SW2
8 CNIT
(BU)
1
1
CNIH
(OG)
3
SW1
CN22 1
(BU)
1 2
CNBHT
8
(BK)
CN108
3
LED4
CN1A CNW5 CNW12 CN21 CN20
(WH) (WH) (RD) (YE) (RD)
1 1
1 1
1
2 2
3
4 4
8 10 12 14 2 4 6 8 10 12 14 2 4 6 8 10 12 14
7 9 11 13 1 3 5 7 9 11 13 1 3 5 7 9 11 13
TBI.2
TBI.1 TBI.3
TBI.1
1 2 3 4 5 6 7 8 9 10 11 12 13
4 1 3 1 2
° t ° t ° t °
Item
— Room thermostat 1 input *1 Refer to SW2-1 in <6-19. DIP switch functions>.
— Flow switch 1 input
— Flow switch 2 input (Zone1) Refer to SW3-2 in <6-19. DIP switch functions>.
— Demand control input
— Outdoor thermostat input *2 Standard operation Heater operation/ Boiler operation *3
— Room thermostat 2 input *1 Refer to SW3-1 in <6-19. DIP switch functions>.
— Flow switch 3 input (Zone2) Refer to SW3-3 in <6-19. DIP switch functions>.
— Electric energy meter 1
— Electric energy meter 2
— Heat meter
—
Smart grid ready input
—
— Water circulation pump 2 output (Space heating for Zone1)
Water circulation pump 3 output (Space heating for Zone2) *1
—
2-way valve 2b output *2
— Mixing valve output *1
CNBH 1-3 Booster heater 1 output
CNBH 5-7 Booster heater 2 output
— Boiler output
— Error output
— Defrost output
— 2-way valve 2a output *2
CNP4 Water circulation pump 4 output (DHW)
— Comp. ON signal
32
Indoor unit powered
Indoor unit powered
by independent source
via outdoor unit
To outdoor
Power supply
unit
~/N 230V 50Hz
L N S1 S2 S3 L N S1
TB1
BK
1
BK
BK
2
BK
4
6 1
1
2
CN01 CN01 2
(WH) 4 (WH)
4
6
6
BN BN
1 1
CN3C CN3C
OG
(BU) OG (BU)
3 3
Wireless receiver
(Option) 1. S ymbols used in wiring diagram are,
: connector,
WiFi adapter
2. I ndoor unit and outdoor unit connecting
(Option)
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.
TBI.3
14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4
+ - + - + -
CN22
CN1A
(BU)
(WH)
1 4 1 2
t t
° °
OFF (Open) ON (Short)
Refer to SW2-2 in <6-19. DIP switch functions>.
Normal Heat source OFF/ Boiler operation *3
Refer to installation manual.
Item OFF
OFF
OFF
OFF
Heating
Stop
OFF
OFF
OFF
OFF
Normal
Normal Defrost
OFF
OFF
OFF
To outdoor
unit
S2 S3
TB1
: terminal block.
5 6 7 8 9 10 11 12 13 14
t t t t
° ° ° °
ON
ON
ON
ON
DHW
Close
Open
ON
ON
ON
ON
Error
ON
ON
ON