Mitsubishi EHST20C-VM2C Service Manual page 20

6-6. EHST20C-VM6CR2.UK, EHST20C-VM6ECR2.UK, EHPT20X-VM6CR2.UK
Power supply Immersion heater (1Ph3kW)(Option)
to Booster heater
~/N 230V 50Hz
L N
(1) (3)
ECB2
ECB1
2 4
IHC
1 3 5 A1
BHCP
A2
2 4 6
BHC1
1 3 5 A1 1 3 5 A1 BHC2
2 4 6 A2 2 4 6 A2
BH1 BH2
2 2 2
BHF BHT
2
1
2
CNBHT
3
(BK)
1
2
CNBC
3
(GY)
1
2
3
CNBH
5
2 (WH)
7
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 & 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)
BHT Thermostat for booster heater
BHF Thermal fuse for booster heater
BH1 Booster heater 1
BH2 Booster heater 2
BHC1 Contactor for booster heater 1
BHC2 Contactor for booster heater 2
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)
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
Power supply
to Immersion heater
~/N 230V 50Hz
L N
(1) (3)
CNPWM
(WH)
1
3
3
CNP1
2 4
(WH) TBO.1
X1
1
1
M
1~
2
3
M MP1
X2
3
1~
1 3 5 A1 M
2WV2b 1~
4
MP2 X3
5
M
6
1~
MP3
X14
1
A2
2 4 6
M
1~
MP4 3
CNP4
(RD)
A B
TBO.2 X5A
Close
1
M N
1~ Open 2
MXV X5B
3
1 X4
IHT 4
M 3
IH
1~ 5
5
3WV
6
CNV1
(WH)
TBO.3
X10
1
Signal output
(Boiler)
2
2
X11
3
1 Signal output
CNIH (Error)
4
3
(OG)
X12
5
Signal output
(Defrost)
6
X15
Signal output 7
(Comp. ON)
8
TBO.4
X13
1
CNIH
M
(OG)
2
2WV2a X9
3
1
4
3
X8
5
6
1
3
CNBHT
(BK)
CNBC
(GY)
1
3
X6
1
3
X7
5
7
CNBH
(WH)
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 dam-
aged.
*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
F1
6
Tool
CN01
F2 (WH)
Conductor
Outline view
1 TBO.1
2
3 CNP1
1
(WH)
4 3
5
6 F2
IEC T6.3AL250V
1
1 CNP4
TBO.2
1
(RD)
3
2
3 SW5
4
5 8
LED1
6 1
1
CNV1
TBO.3 3
1 SW4
(WH)
5
2
6
3
1
4
5
SW3
6
LED2
7
8 8
1
TBO.4
1
LED3
2
SW2
3
4
8
5
1
1
6 CNIH
(OG)
3
SW1
1 1
CNBC CNBHT
8
(GY) (BK)
3 3
1
LED4
CNBH
(WH)
7
CN1A CNW5 CNW12
(WH) (WH)
1
1
2
4
2 4 6 8 10 12 14 2 4 6 8 10 12 14 2
1 3 5 7 9 11 13 1 3 5 7 9 11 13 1 3
TBI.1 TBI.3
TBI.1
1 2 3 4 5 6 7
1 2 1 4 1 3 1 2
t ° t ° 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
20
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
Conductor
Top view
BK
1
BK
CN01 2
(WH)
4
6 1
1
2
CN01 CN01 2
(WH) (WH)
4 4
F1 6
6
IEC T10AL250V
1
CN3C
BN
(BU)
1 1
3 CN3C CN3C
(BU) OG (BU)
3 3
1
CNPWM
(WH)
3
CNRF
Wireless receiver
1. S ymbols used in wiring diagram
(WH)
(Option)
are,
CN105 WiFi adapter
terminal block.
(RD) (Option)
2. Indoor unit and outdoor unit
CNIT
(BU)
connecting wires have polarities,
make sure to match terminal
CN22 1
(BU)
2
numbers (S1, S2, S3) for correct
CN108
wirings.
3. Since the outdoor unit side
electric wiring may change,
CN21 CN20
be sure to check the outdoor
(RD) (YE) (RD)
1
1
1
unit electric wiring diagram for
2
3
4
service.
4 6 8 10 12 14
5 7 9 11 13
TBI.2
TBI.3
8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2
+ - + - + -
CN22
CN1A
(BU)
(WH)
1 4
1 2
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
L N S1 S2 S3 TB1
BK
BK
BN
OG
: connector, :
3 4 5 6 7 8 9 10 11 12 13 14
t t t t t t
° ° ° ° ° °
ON
ON
ON
ON
DHW
Close
Open
ON
ON
ON
ON
Error
ON
ON
ON