Mitsubishi Electric EHSC-MEC Service Manual page 21

6-8. EHSC-VM6CR1.UK, EHSC-VM6ECR1.UK, EHPX-VM6CR1.UK
Power supply
to Booster heater
~/N 230V 50Hz
L N
(1) (3)
ECB1
2 4
1 3 5 A1
BHCP
A2
2 4 6
BHC1
1 3 5 1 3 5 BHC2
A1 A1
2 4 6 A2 2 4 6 A2
BH1 BH2
2 2 2
BHT
BHF
2
2
2
2
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
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)
IN4 TBI.1 7-8 — Demand control input
Outdoor thermostat input
IN5 TBI.1 5-6 —
*1
IN6 TBI.1 3-4 — Room thermostat 2 input
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2)
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
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>
ECB1 Earth leakage circuit breaker for booster 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)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
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
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
OCH571D
CNPWM
(WH)
1
3
3
CNP1
TBO.1
(WH)
X1
1
1
M
1~
2
3
M MP1
X2
1~ 3
M
2WV2b
1~ 4
MP2 X3
5
M
1~ 6
MP3
X14
1
M
1~
MP4 3
CNP4
(RD)
TBO.2 X5A
Close
1
M
N
1~ Open 2
X5B
MXV 3
X4
1
4
3
*1
5
5
6
CNV1
(WH)
TBO.3
X10
1
Signal output
(Boiler)
2
X11
Signal output 3
(Error)
4
X12
5
Signal output
(Defrost)
6
X15
7
Signal output
(Comp. ON)
8
TBO.4
X13
1
1 CNIH
M
CNBHT
(OG)
2
3
(BK)
X9
2WV2a
3
1
1
CNBC
4
3
3
(GY) X8
5
Signal output
1 (Cooling)
6
3
CNBH
5
(WH)
1
7
3
CNBHT
(BK)
CNBC
(GY)
1
3
X6
1
3
X7
5
7
CNBH
(WH)
OFF (Open) ON (Short)
Refer to SW2-1 in
<6-16. DIP switch functions>.
Refer to SW2-2 in
<6-16. DIP switch functions>.
Refer to SW3-2 in
<6-16. DIP switch functions>.
Heat source OFF/
Normal
Boiler operation *2
Standard opera- Heater operation/
tion Boiler operation *2
Refer to SW3-1 in
<6-16. DIP switch functions>.
Refer to SW3-3 in
<6-16. DIP switch functions>.
Refer to installation manual.
Symbol
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
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)
IN1A Flow sensor
<How to use TBO.1 to 4>
1
Connect them using either way as shown below.
2
4
F1
Tool
6
CN01
F2
(WH)
Conductor
Conductor
Outline view Top view
TBO.1
1 CN01
2 (WH)
3 1 CNP1
4 3 (WH)
5
6 F2
IEC T6.3AL250V IEC T10AL250V
1 CNP4 1
TBO.2
1
3 (RD)
2
3 SW5
CN3C
4
(BU)
5 8
LED1
6 1
1
CNPWM
CNV1
TBO.3 3
1
SW4 (WH)
(WH)
2 5
6
3
1
4
CNRF
5
(WH)
SW3
6
LED2
7
8
8
1 CN105
TBO.4
1
(RD)
LED3
2
SW2
3
4
8
CNIT
5
1 (BU)
1
6 CNIH
(OG)
3
SW1
CN22
(BU)
1 1
CNBC CNBHT
8
(GY) (BK)
CN108
3 3
1
LED4
CNBH
(WH)
7
CN1A CNW5 CNW12 CN21
(WH) (WH) (RD) (YE)
1
1
1
1
2
3
4 4
2 4 6 8 10 12 14 2 4 6 8 10 12 14 2 4 6 8 10
1 3 5 7 9 11 13 1 3 5 7 9 11 13 1 3 5 7 9 11
TBI.2
TBI.1 TBI.3
TBI.1
1 2 3 4 5 6 7 8 9 10 11 12
1 2 1 4 1 3 1 2
t t t t t
° ° ° ° °
Table 2 Outputs
Name Terminal block Connector
Water circulation pump 1 output (Space heat-
OUT1 TBO.1 1-2 CNP1
ing/cooling & DHW)
Water circulation pump 2 output (Space heat-
OUT2 TBO.1 3-4 —
ing/cooling for Zone1)
Water circulation pump 3 output (Space heat-
ing/cooling for Zone2) *1
OUT3 TBO.1 5-6 —
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-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
21
Indoor unit powered Indoor unit powered
by independent source
via outdoor unit
To outdoor To outdoor
Power supply
unit ~/N 230V 50Hz unit
Tool
L N S1 S2 S3 TB1 L N S1 S2 S3 TB1
BK
1
BK
BK
2
BK
4
1
6
1
2
2
CN01 CN01
4
(WH) (WH) 4
F1 6
6
1
BN
BN
1 1
3
CN3C CN3C
OG
OG
(BU) (BU)
3 3
1
3
Wireless receiver
(Option)
WiFi adapter
(Option)
1
2
CN20
*1
(RD)
1
3WV 2WV1
2
4 5 6 4 5 6
TBO.2 TBO.2
12
M M
13
1~
1~
3WV 2WV1
TBI.3
13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7
+ – + – + –
CN22
CN1A
(BU)
(WH)
1 4 1 2
t t t
° ° °
Item
Symbol Name
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 <6-16. 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
8 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