32
6-18.
EHPT20X-MHCW
R2.UK
, EHST20C-MHCW
R2.UK
, EHST20D-MHCW
R2.UK
Tool
Tool
Conductor
Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
NL
S3S2S1
NL
S3S2S1
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
1310 12 141174 65 932 811310 12 141174 65 932 811310 12 141174 65 932 81
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
IN11
IN12
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
642
531
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
12 146 108
137 119
4
53
2
1
12 146 108
137 119
4
53
2
1
12 146 108
137 119
4
53
2
1
Flow
Sensor
1
4
CN1A
(WH)
Symbol Name
TB1 Terminalblock<Powersupply,Outdoorunit>
ECB2
Earthleakagecircuitbreakerforimmersionheater
MP1
Watercirculationpump1(Spaceheating&DHW)
MP2 Water circulation pump 2
(SpaceheatingforZone1)(Localsupply)
MP3 Water circulation pump 3
(SpaceheatingforZone2)(Localsupply)
MP4 Water circulation pump 4 (DHW)
3WV 3-wayvalve
2WV2a 2-wayvalve(ForZone1)(Localsupply)
2WV2b 2-wayvalve(ForZone2)(Localsupply)
MXV Mixingvalve(Localsupply)
IHT Thermostat(xedtemp.)forimmersionheater
IH Immersion heater
IHC Contactor for immersion heater
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor(Flowwatertemp.)
THW2 Thermistor(Returnwatertemp.)
THW5 Thermistor(DHWtankwatertemp.)
THW6 Thermistor(Zone1owtemp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor(Zone2owtemp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor(Boilerowtemp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flowswitch1(Localsupply)
IN3 Flowswitch2(Localsupply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flowswitch3(Localsupply)
IN8 Electricenergymeter1(Localsupply)
IN9 Electricenergymeter2(Localsupply)
IN10 Heat meter (Local supply)
IN11
Smartgridreadyinput(Localsupply)
IN12
IN1A Flowsensor
FLOW TEMP. CONTROLLER (FTC5)
TBO.1-4
Terminal block <Outputs>
TBI.1-3 Terminalblock<SignalInputs,Thermistor>
F1 Fuse (IEC T10AL250V)
F2 Fuse (IEC T6.3AL250V)
SW1-5 DIPswitch*See6-19.DIPswitchfunctions.
X1-15 Relay
LED1 Powersupply(FTC5)
LED2 Powersupply(Mainremotecontroller)
LED3 Communication (FTC5-Outdoor unit)
LED4 ReadingorwritingdatatoSDcard
CNPWM
PumpspeedcontrolsignalforMP1
CN108 SD card connector
1.Symbolsusedinwiringdiagramare,
: connector, : terminal block.
2.Indoorunitandoutdoorunitconnecting
wireshavepolarities,makesureto
match terminal numbers (S1, S2, S3) for
correctwirings.
3. Since the outdoor unit side electric
wiringmaychange,besuretocheckthe
outdoorunitelectricwiringdiagramfor
service.
Table 1 Signal Inputs
Name
Terminal block
Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input *1 RefertoSW2-1in<6-19.DIPswitchfunctions>.
IN2 TBI.1 11-12 — Flowswitch1input RefertoSW2-2in<6-19.DIPswitchfunctions>.
IN3 TBI.1 9-10 — Flowswitch2input(Zone1) RefertoSW3-2in<6-19.DIPswitchfunctions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/ Boiler operation *3
IN5 TBI.1 5-6 — Outdoor thermostat input *2 Standard operation Heater operation/ Boiler operation *3
IN6 TBI.1 3-4 — Room thermostat 2 input *1 RefertoSW3-1in<6-19.DIPswitchfunctions>.
IN7 TBI.1 1-2 — Flowswitch3input(Zone2) RefertoSW3-3in<6-19.DIPswitchfunctions>.
IN8 TBI.3 1-2 — Electricenergymeter1
Refer to installation manual.
IN9 TBI.3 3-4 — Electricenergymeter2
IN10
TBI.3 5-6 — Heat meter
IN11
TBI.3 7-8 —
Smartgridreadyinput
IN12
TBI.3 9-10 —
IN1A
TBI.3 12-14 CN1A Flowsensor
*1.SettheON/OFFcycletimeoftheroomthermostatfor10minutesormore;otherwisethecompressormaybedamaged.
*2.Ifusingoutdoorthermostatforcontrollingoperationofheaters,thelifetimeoftheheatersandrelatedpartsmaybe
reduced.
*3.Toturnontheboileroperation,usethemainremotecontrollertoselect“Boiler”in“Externalinputsetting”screeninthe
service menu.
Table 2 Outputs
Name
Terminal block
Connector
Item OFF ON
OUT1
TBO.1 1-2 CNP1 Watercirculationpump1output(Spaceheating&DHW) OFF ON
OUT2
TBO.1 3-4 — Watercirculationpump2output(SpaceheatingforZone1) OFF ON
OUT3
TBO.1 5-6 —
Watercirculationpump3output(SpaceheatingforZone2)*1
OFF ON
2-wayvalve2boutput*2
OUT4
TBO.2 4-6 CNV1 3-wayvalveoutput Heating DHW
OUT5
TBO.2 1-2
— Mixingvalveoutput*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-wayvalve2aoutput*2 OFF ON
OUT14
— CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15
TBO.3 7-8 — Comp.ONsignal OFF ON
Donotconnecttotheterminalsthatareindicatedas“—”inthe“Terminalblock”eld.
*1.For2-zonetemperaturecontrol.
*2.For2-zonevalveON/OFFcontrol.