Mitsubishi EHPT20X-MHCW, Service Manual

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31
6-17. EHPT20X-MHCWR1.UK, EHST20C-MHCWR1.UK, EHST20D-MHCWR1.UK
Tool
Tool
Conductor
Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
N L S3 S2 S1 N L S3 S2 S1
To outdoor
unit
TB1
OG
OG
YE
YE
GNYE
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
OG BU
RD BU RD YE
GNYE
1
3
CN3C
(BU)
BK
BK
BK
BK
1
3
OG
BN
CN3C
(BU) OG
OG
BN
YE
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BU)
1
3
CNPWM
(WH)
LED1
LED2
LED3
LED4
TBI.1 TBI.2
13 10 12 14 11 7 4 6 5 9 3 2 8 1 13 10 12 14 11 7 4 6 5 9 3 2 8 1 13 10 12 14 11 7 4 6 5 9 3 2 8 1
IN6 IN1 IN2 IN3 IN4 IN5 IN7
THW8 THW7 THW6 THW9
THWB1 THWB2
t° t° t° t° t° t°
Main remote controller
1
+ - + - + -
2
1 2
CN20 (RD)
TH1
t°
1 3
CN21 (YE)
TH2
t°
1 4
THW1 THW2
CNW12
(RD)
t° t°
1 2
THW5
CNW5 (WH)
t°
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WH)
CN105
(RD)
CN22
(BU)
1
3
5
7
1
3
5
Close
Open
N
X6
X7
TBO.2
TBO.1
F1
F2
MXV
M
1~
MP2
MP1
M
1~
1
3
CNV1
(WH)
1
3
CNBHT
(BK)
CNBC
(GY)
CNBH
(WH)
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WH)
CNP4
(RD)
CNPWM
(WH)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WH)
CNP4
(RD)
CNV1
(WH)
CN22
(BU)
CNIT
(BU)
TAB1
CN01
(WH)
F2 F1
IEC T6.3AL250V IEC T10AL250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
5
3
1
3
1
3
8
1
8
1
6
CN01
(WH)
CN01
(WH)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WH)
CNBC
(GY)
1
1
3
1
2 1
2
1
2
CNBHT
(BK)
1
3
7
1
3
CNIH
(OG)
1
4
1
3
CNW5
(WH)
CN21
(YE)
CNW12
(RD)
CN20
(RD)
TBI.2
MP3
M
1~
IN8 IN9
IN10
TBI.3
TBI.3
1
4
CN1A
(WH)
TBI.1
2WV2b
M
1~
M
1~
MP4
M
1~
1
3
L
(1)
N
(3)
OG
RD
BU
BU RD
OG
IHC
IHT
IH
6 4 2
5 3 1 A1
A2
A B
2 4
Immersion heater (1Ph3kW)
Power supply
to Immersion heater
~/N 230V 50Hz
1
2
CNIH
(OG)
3
3WV
M
1~
ECB2
1
2
4
6
CN01
(WH)
X15
X12
TBO.3
X11
X10
1
2
3
4
5
6
7
8
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp. ON)
1
2
3
4
5
6
TBO.4
M
2WV2a
1
3
X9
X8
X13
CNIH
(OG)
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
12 14 6 10 8
13 7 11 9
4
5 3
2
1
12 14 6 10 8
13 7 11 9
4
5 3
2
1
12 14 6 10 8
13 7 11 9
4
5 3
2
1
Flow Sensor
1 4
CN1A
(WH)
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 OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat
1 input
Refer to SW2-1 in
<6-19. DIP switch functions>.
IN2 TBI.1 11-12 —
Flow switch 1
input
Refer to SW2-2 in
<6-19. DIP switch functions>.
IN3 TBI.1 9-10 —
Flow switch 2
input (Zone1)
Refer to SW3-2 in
<6-19. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control
input
Normal
Heat source OFF/
Boiler operation *2
IN5 TBI.1 5-6 — Outdoor thermo-
stat input *1
Standard opera-
tion
Heater operation/
Boiler operation *2
IN6 TBI.1 3-4 — Room thermostat
2 input
Refer to SW3-1 in
<6-19. DIP switch functions>.
IN7 TBI.1 1-2 —
Flow switch 3
input (Zone2)
Refer to SW3-3 in
<6-19. DIP switch functions>.
IN8 TBI.3 1-2 —
Electric energy
meter 1
Refer to installation manual. 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.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1
Water circulation pump 1 output (Space heating &
DHW)
OFF ON
OUT2 TBO.1 3-4 —
Water circulation pump 2 output (Space heating for
Zone1)
OFF ON
OUT3 TBO.1 5-6 —
Water circulation pump 3 output (Space heating for
Zone2) *1
OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve output Heating DHW
OUT5
TBO.2 1-2
— Mixing valve output *1 Stop
Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
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.
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.)
Symbol Name
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)
IN1A Flow sensor
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 <6-19. 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