Mitsubishi Electric EHWT17D-MHEDW Product guide

DATA BOOK
Vol.5.5
R32

Contents
Wheninstallingorrelocating,orservicingtheheatpump,useonlythespeciedrefrigerant(R32)tocharge
therefrigerantlines.Donotmixitwithanyotherrefrigerantanddonotallowairtoremaininthelines.
Ifairismixedwiththerefrigerant,thenitcanbethecauseofabnormalhighpressureintherefrigerantline,
andmayresultinanexplosionandotherhazards.
The useofanyrefrigerantotherthanthatspeciedforthesystemwillcausemechanicalfailureorsystem
malfunctionorunitbreakdown.Intheworstcase,thiscouldleadtoaseriousimpedimenttosecuringproduct
safety.
Outdoorunit............................. A-1
Cylinderunit
Hydrobox
GroundSourceHeatPump..... B-1
Flowtemp.controller............... C-1
Optional parts........................... D-1
Outdoor unitCylinder unit /
Hydrobox / GSHP
Flow temp.
controller
Optional parts

Outdoor unit
A-1
Contents
1 Specications ........................................................A-2
1.1 Outdoor unit specications............................................... A-2
1.2 Capacity ......................................................................... A-15
1.3 Maximum outlet water temperature ............................... A-26
1.4 Available range (Water ow rate, return water temp.).... A-28
2 Outlines and dimensions ....................................A-35
3 Wiring diagrams...................................................A-40
4 Refrigerant system diagrams .............................A-49
5 Performance data ................................................A-53
5.1 Cooling performance data.............................................. A-53
5.2 Heating performance data ............................................. A-56
5.3 Part load chart................................................................ A-66
5.4 Best COP ....................................................................... A-83
5.5 Correcting capacity for changes
in the length of refrigerant piping ............................ A-84
6Noise criterion curves .........................................A-86
7 Estimated noise level based
on the distance from Outdoor unit .............A-90
8 Earthquake-proof strength analysis ..................A-93
9 Error code table .................................................A-111
10
Installation location ...........................................A-112
Outdoor unit

Cylinder unit / Hydrobox / Ground source heat pump (GSHP) /
Water to Water Heat Pump (WTW)
Contents
1 Combination table .................................................B-3
2 Specications ........................................................B-6
2.1. Cylinder unit .................................................................... B-6
2.2. Hydrobox....................................................................... B-16
2.3. Ground source heat pump (GSHP)............................... B-22
2.4. Water to Water Heat Pump (WTW)............................... B-23
3Performance data ................................................B-24
3.1. Combination Performance ............................................ B-24
3.2. Heat time data (DHW mode)......................................... B-33
3.3. Ground source heat pump (GSHP)............................... B-34
3.4. Water to Water Heat Pump (WTW)............................... B-35
3.5. Noise criterion curves ................................................... B-36
4Cylinder unit.........................................................B-38
4.1. Outlines and dimensions............................................... B-38
4.2. Wiring diagrams ............................................................ B-41
4.3. Dip switch functions ...................................................... B-49
4.4. Field wiring.................................................................... B-50
4.5. Water circuit diagrams .................................................. B-60
4.6. Installation..................................................................... B-67
4.7. System Set Up .............................................................. B-73
4.8. Service and Maintenance ............................................. B-89
5Hydrobox ............................................................B-101
5.1. Outlines and dimensions............................................. B-101
5.2. Wiring diagrams .......................................................... B-104
5.3. Dip switch functions .................................................... B-109
5.4. Field wiring...................................................................B-110
5.5. Water circuit diagrams .................................................B-117
5.6. Installation................................................................... B-120
5.7. System Set Up ............................................................ B-126
5.8. Service and Maintenance ........................................... B-142
6 Ground source heat pump (GSHP) ..................B-152
6.1. Outlines and dimensions............................................. B-152
6.2. Wiring diagrams .......................................................... B-154
6.3. Dip switch functions .................................................... B-155
6.4. Field wiring.................................................................. B-156
6.5. Water circuit diagrams ................................................ B-163
6.6. Installation................................................................... B-166
6.7. System Set Up ............................................................ B-173
6.8. Service and Maintenance ........................................... B-195
6.9. Supplementary information ......................................... B-207
B-1
Cylinder unit/
Hydrobox/GSHP/WTW

Cylinder unit / Hydrobox / Ground source heat pump (GSHP) /
Water to Water Heat Pump (WTW)
Contents
7 Water to Water Heat Pump (WTW) ...................B-208
7.1. Outlines and dimensions............................................. B-208
7.2. Wiring diagrams .......................................................... B-210
7.3. DIP Switch Function(FTC) ...........................................B-211
7.4. Field wiring.................................................................. B-212
7.5. Water circuit diagrams ................................................ B-220
7.6. Installation................................................................... B-224
7.7 System Set Up ............................................................. B-233
7.8 Service and Maintenance ............................................ B-255
7.9. Supplementary information ......................................... B-267
B-2
Cylinder unit/
Hydrobox/GSHP/WTW

Model name EHWT17D-MHEDW
Dimensions Height mm 1750
Width mm 595
Depth mm 680
Casing Munsell - 6.2PB 9/0.9
RAL code - 260 90 05
Material - Pre-coated metal
Product weight (empty) kg 166
Product weight (full) kg 345
Gross weight kg 183
Water volume of heating circuit in the unit *1 L 5.47
Brine/Water volume of ambient loop circuit in the unit L 3.16
Type of Installation - Floor standing
Electrical data Heat pump
(exclude immersion
heater)
Power supply Ph ~/N
V 230
Hz 50
Breaker A 16
Booster heater Power supply Ph -
V -
Hz -
Capacity kW -
Heater step - -
Current A -
Breaker A -
Immersion heater Power supply Ph ~/N
V 230
Hz 50
Capacity kW 3
Current A 13
Breaker A 16
Water circulation
pump
(Primary circuit)
Performance
curve:
please refer
to section 4.6.4
Type DC motor
Input
(10/20/max L/min)
Speed 1 10/13/15
Speed 2 16/21/27
Speed 3 24/32/42
Speed 4 34/46/58
Speed 5 47/58/60
Current
(10/20/max L/min)
Speed 1 0.2/0.2/0.3
Speed 2 0.2/0.3/0.4
Speed 3 0.3/0.4/0.5
Speed 4 0.4/0.5/0.6
Speed 5 0.5/0.6/0.6
Water circulation
pump
(DHW circuit)
Input Speed 55
Speed (Default setting) 69
Speed 80
Current Speed 0.25
Speed (Default setting) 0.31
Speed 0.34
Flow rate Speed 13.5
Speed (Default setting) 19.0
Speed 22.9
Flow rate Primary circuit Max.*2 L/min 27.7
Min.*3 L/min 7.1
Ambient loop Max.*2 L/min 24.0
Min.*3 L/min 7.2
Heat exchanger Ambient loop circuit - Refrigerant - MWA1-70PA
Refrigerant - Primary circuit water - MWA1-44PA
Primary circuit water - Domestic hot water - CBH18-18H
Domestic hot
water tank
Volume L 170
Material -Duplex 2010 stainless
steel (EN10088)
Declared load prole - L
Average climate ηwh (water heating e󰀩ciency) - 171
Water heater energy e󰀩ciency class - A+
Expansion vessel
(Primary circuit)
Volume L -
Charge pressure MPa -
Safety device Primary circuit Control thermistor °C 1 to 80
Pressure relief valve MPa 0.3
Flow sensor (Min. ow) L/min 5.0
BH manual reset thermostat °C -
BH thermal Cut O󰀨 °C -
DHW tank Control thermistor °C 40 to 70
IH manual reset thermostat °C 85
Temperature & pressure
relief valve
°C 90
MPa 0.7
Ambient loop Control thermistor °C 10 to 30
Flow switch (Min. ow) L/min 5.5
Refrigerant circuit
Control thermistor (High) °C -20 to 125
Control thermistor (Low) °C -40 to 90
Pressure switch MPa 4.14 ± 0.1
Pressure sensor MPa 0 to 5.0
Connections Water Primary circuit mm φ28
DHW circuit mm φ22
Ambient loop mm φ22
Refrigerant - R32
Guaranteed
operating range
Ambient *4 °C 0 to 35
%RH 80
Water inlet temperature (Ambient loop) °C 10 to 30
Min. Water outlet temperature (Ambient loop) °C 4
Operating range Heating Room temperature °C 10 to 30
Flow temperature °C 20 to 60
DHW °C 40 to 60
Legionella prevention °C 60 to 70
Sound power level dB(A) 38
*1 Volume of sanitary water circuit is not included in this value.
*2 If the water ow rate exceeds maximum, the ow speed will be greater than 1.5 m/s, which could corrode the pipes.
*3 If the water ow is less than the minimum, the ow error will be activated.
*4 The environment must be frost-free.
2.4 Water to Water Heat Pump (WTW)
Specications
2
B-23
Cylinder unit/
Hydrobox/GSHP/WTW

3.4 Water to Water Heat Pump (WTW)
EHWT17D-MHEDW
Flow rate
Ambient loop: 19.2 L/min Heating: 12.4 L/min
W10W35
Capacity COP
% kW
100% 6.5 5.7
75% 4.8 5.9
50% 3.2 5.7
25% 1.6 4.2
Ambient loop: 14.4 L/min Heating: 12.4 L/min
W15W35
Capacity COP
% kW
100% 7.4 6.4
75% 5.5 7.2
50% 3.7 6.6
25% 1.8 4.7
Ambient loop: 9.6 L/min Heating: 12.4 L/min
W20W35
Capacity COP
% kW
100% 7.5 6.8
75% 5.6 7.6
50% 3.7 7.2
25% 1.8 6.0
Ambient loop: 9.6 L/min Heating: 12.4 L/min
W25W35
Capacity COP
% kW
100% 8.3 8.4
75% 6.2 9.3
50% 4.1 9.2
25% 2.0 9.1
W10W45
Capacity COP
% kW
100% 6.3 4.3
75% 4.7 4.4
50% 3.1 4.1
25% 1.5 2.8
W15W45
Capacity COP
% kW
100% 7.1 4.8
75% 5.3 5.2
50% 3.5 4.5
25% 1.7 3.1
W20W45
Capacity COP
% kW
100% 7.3 5.2
75% 5.4 5.4
50% 3.6 4.8
25% 1.8 3.4
W25W45
Capacity COP
% kW
100% 8.1 5.9
75% 6.0 6.9
50% 4.0 6.3
25% 2.0 4.2
W10W55
Capacity COP
% kW
100% 5.9 3.0
75% 4.4 3.1
50% 2.9 2.6
25% 1.4 1.6
W15W55
Capacity COP
% kW
100% 6.7 3.5
75% 5.0 3.5
50% 3.3 2.9
25% 1.6 1.8
W20W55
Capacity COP
% kW
100% 7.0 3.8
75% 5.2 3.7
50% 3.5 3.2
25% 1.7 2.2
W25W55
Capacity COP
% kW
100% 7.8 4.3
75% 5.8 5.1
50% 3.9 4.6
25% 1.9 2.9
COP contains the "pump input (Based on EN 14511)" 100%: MAX Capacity
Performance data
3
B-35
Cylinder unit/
Hydrobox/GSHP/WTW

0.8 m
1 m
MICROPHONE
UNIT
GROUND
0.4 m
1 m
MICROPHONE UNIT
WALL
10
20
30
40
50
60
70
80
90
800040002000100050025012563
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTRE FREQUENCIES, Hz
Ground source heat pump (GSHP)
Pump speed: 5
Flow rate: 20L/min
SPL: 30dB
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Cylinder unit
Ground source heat pump (GSHP)
Water to Water heat pump (WTW)
Hydrobox
3.5 Noise criterion curves
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTRE FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
Cylinder unit
Pump speed (primary circuit): 5
Pump speed (sanitary circuit): 2
Flow rate: 20L/min
SPL: 29dB
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTRE FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
Hydrobox
Pump speed: 5
Flow rate: 20L/min
SPL: 29dB
Performance data
3
B-36
Cylinder unit/
Hydrobox/GSHP/WTW

10
20
30
40
50
60
70
80
90
800040002000100050025012563
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTRE FREQUENCIES, Hz
Water to Water heat pump (WTW)
Pump speed: 5
Flow rate: 20L/min
SPL: 27dB
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Performance data
3
B-37
Cylinder unit/
Hydrobox/GSHP/WTW

a
e b
d
<Figure 7.1.2>
Service access
Service access diagrams
Service access
Parameter Dimension (mm)
a300
b150
c
(distance behind unit not visible
in Figure 7.1.2)
10
d700**
e150*
<Table 7.1.2>
* An additional space is required, when brine pipe connecting
to the side.
** Including service space for Module removal.
Su󰀩cient space MUST be left for the provision of discharge
pipework as detailed in National and Local Building Regula-
tions.
The heat pump unit must be located indoors and in a frost-
free environment, for example in a utility room, to minimise
heat loss from stored water.
B-209
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW
Cylinder unit/
Hydrobox/GSHP/WTW

t°t°
t°t° t°t°
U
TB1
V
W
RD
WH
BK
MC
LN
RD
GNYE
P.B.
C.B.
CNS
(WH)
CNAC
(WH)
CNDC
(PK)
F3
F4
CN2
(RD)
CN4
(WH)
2
7
1 21 7
1
3
1
312
3 4
2
CNDM
(WH)
CNM
(WH)
1
14
SW4
BK
X51
X52
3
121S4
(GN)
SV3/SS
(WH)
31
X54
3
1SV1/CH
(GY)
71
CNF1
(WH)
51 LEV-A
(WH)
31
63H
(YE)
31
TH33
(YE)
1
4
TH3
(WH)
TH7/6
(RD)
2 1
TH4
(WH)
31
63L
(RD)
LED1LED2
31
63HS
(WH)
TH32
(BK)
TH34
(RD)
t°
TH7
1
2
CN22
(BU)
CN108
CN01
(BK)
1
3
CN3C
(BU)
1
3
CNPWM
(WH)
1
8
CN851
(BK)
1
5
CNRF
(WH)
1
5
CN105
(RD)
1
5
CNIT
(BU)
IN4IN3IN2IN1 IN10IN7IN6IN5
12345678 12345678 12345678
IN12IN9IN8 IN11
8 1234567
1 4
CN1A
(WH)
12345678 123456
t°t°
THW6 THW7 THW8 THW9
t°t° t°t°
12345678
THWB1 THW10
2 1
Main remote
controller
TBI.1 TBI.2 TBI.3 TBI.4 TBI.5 TBI.6
t°t°
1 3 1 2
14
t°
t°t°t°
LED1
LED2
LED3
LED4
TAB1
1
8
1
8
1
8
1
8
1
6
SW1
SW2
SW3
SW4
SW5
F1F2
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
7
81
3
CNI H
(OG)
CNV1
(WH)
CNP4
(RD)
CNP1
(WH)
TBO.1
TBO.2
TBO.3
TBO.4
1
3
5
1
3
CNP4
(RD)
F1
F2
CN01
(BK)
TBO.1
X1
X2
X3
X14
1
3
3
CNPWM
(WH)
CNP1
(WH)
1
3
MP1
2WV2b
MP3
MP4
1
2
3
4
5
6
TBO.2
1
3
5
CNV1
(WH)
1
2
3
4
5
6
7
8
TBO.3
X4
X10
X16
X11
X12
TBO.4
1
2
3
4
5
6
7
8
X15
X13
X9
X8
CNIH
(OG)
2WV2a 1
3
N
(3)
L
(1)
42
BU RD
31 5
A1
42 6 A2
θ θ
IHT
IH
BA
BU RD
1
3
2
CNIH
(OG)
OG OG
ECB2
IHC
CN22
(BU)
TH1
THW5BTHW5A
1
5
3
1
5
3
1
3
1
3
to FTC board
(*2)
X5B
X5A
MXV
Close
N
Open
- + + -
MP2
1
2
3
4
5
6
SW8 SW5
SW6SW1
SW7
SW9
1 3
21
1 61 31 2
811 6
1 61 4
- + - +
1 4
*1
LEV-A
5
MM
63L 63H
63HS
CN1A
to (*3)
to (*3)
to (*4)
to (*4)
to (*5)
to (*5) to (*6)
to (*6)
1
5
SW6
M
3WV
1 2 2 1
1 2 3 4 5 6
ON
OFF
1 2 3 4
5 6 7
8
ON
OFF
MODEL
EHWT17D-
MHEDW
SW5 SW6
*1
CNAC2
(RD)
CNAC1
(WH) LI
NI
EI
~
+
E3
IC600
DCL
3131
E2
E4
TB1A TB3A
CNDC
(PK)
U
V
W
IC500
+
~
BK BK BK
DS
TB3B TB1B
BK
RD RD
BK
31
CN2
(RD)
1 7
7
1 2
CN6
(WH)
TH8
t°
1 2
CN4
(WH)
2
2
BU
TRANS
2 1
3
4
CN401
to (*7)
1
4
CN401
(WH)
CN401
(WH)
14
to (*7)
TAB1
1
3
CNBC
(GY)
Pressure Independent
Control Valve
1 2
TB2
CNBHT
(BK)
1
3
DT
1
3
TB1A TB3A
1
3
CNBC
(GY)
CNBHT
(BK)
1
3
Symbols used in wiring diagram are, : connector, : terminal block
M
1~
M
1~
M
1~
M
1~
M
1~
M
1~
M
1~
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
FTC
Immersion heater (1Ph3kW)
Power supply
to Immersion heater
~/N 230V 50Hz
Signal output
(Boiler)
Signal output
(thermo on)
Signal output
(Error)
Signal output
(Comp. on)
Wireless receiver
(Option)
WiFi adapter
(Option)
to C.B.
relay connector
(*2)
CN20
(RD)
CN21
(YE)
CNW12
(RD)
CNW5
(BU)
*1 MODEL SELECT
The black square (■) indicates a switch position.
POWER SUPPLY
~/N 230V 50Hz
1
2
CN20
(RD)
1
3
CN21
(YE)
1
4
CNW12
(RD)
CNW5
(BU)
TBI.1 TBI.2 TBI.3 TBI.4 TBI.5 TBI.6
1234567 123456788 12345678 12345678 1 12345678 2345678
1
4
CN1A
(WH)
1
4
TH2 TH33 TH32 TH3 TH4 TH34THW1 THW2
t° t° t° t° t° t° t° t°
MS
3~
• WARNING:
When the main supply is turned off, the voltage in the main capacitor will
drop to 20V in approx. 2 minutes.
When servicing, make sure that LED1 (green) on the C.B. goes out, and
then wait for at least 1 minute.
• Components other than the C.B. may be faulty: Check and take
corrective action, referring to the service manual. Do not replace the
C.B. without checking.
Caution
Insulation resistance of the compressor may be around 1 MΩ on the condition that the
appliance has been left with the main power turned off for a long time or right after the
installation completed.
In case the circuit breaker works, check the insulation resistance after 12 hours from
turning on the main power.
Cautions when Servicing
Insulation resistance of the compressor
7.2. Wiring diagrams
EHWT17D-MHEDW
B-210
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW

7.3. DIP Switch Function(FTC)
Located on the FTC printed circuit board are 6 sets of small
white switches known as DIP switches. The DIP switch number
is printed on the circuit board next to the relevant switches. The
word ON is printed on the circuit board and on the DIP switch
block itself. To move the switch you will need to use a pin or the
corner of a thin metal ruler or similar.
DIP switch settings are listed below in Table 7.3.1.
Only an authorised installer can change DIP switch setting under
one's own responsibility according to the installation condition.
Make sure to turn off heat pump unit power supplies before
changing the switch settings.
DIP switch Function OFF ON
Default
settings
SW1 SW1-1
Boiler WITHOUT Boiler WITH Boiler OFF
SW1-2
Heat pump maximum outlet water temperature 55ºC 60ºC ON
SW1-3
DHW tank WITHOUT DHW tank WITH DHW tank ON
SW1-4
Immersion heater WITHOUT Immersion heater WITH Immersion heater ON
SW1-5
Booster heater WITHOUT Booster heater WITH Booster heater OFF
SW1-6
Booster heater function For heating only For heating and DHW OFF
SW1-7
— — — OFF
SW1-8
Wireless remote controller WITHOUT Wireless remote controller WITH Wireless remote controller OFF
SW2 SW2-1
Room thermostat1 input (IN1) logic change Zone1 operation stop at thermostat short Zone1 operation stop at thermostat open OFF
SW2-2
Flow switch1 input (IN2) logic change Failure detection at short Failure detection at open OFF
SW2-3
Booster heater capacity restriction Inactive Active OFF
SW2-4
— — — OFF
SW2-5
Automatic switch to backup heat source op-
eration (When compressor stops by error) Inactive Active *1
OFF
SW2-6
Mixing tank WITHOUT Mixing tank WITH Mixing tank OFF
SW2-7
2-zone temperature control Inactive Active *4 OFF
SW2-8
— — — ON
SW3 SW3-1
Room thermostat 2 input (IN6) logic change Zone2 operation stop at thermostat short Zone2 operation stop at thermostat open OFF
SW3-2
Flow switch 2,3 input (IN3,7) logic change Failure detection at short Failure detection at open OFF
SW3-3
— — — ON
SW3-4
Electric energy meter WITHOUT Electric energy meter WITH Electric energy meter OFF
SW3-5
— — — OFF
SW3-6
2-zone valve ON/OFF control Inactive Active OFF
SW3-7
— — — ON
SW3-8
Heat meter WITHOUT Heat meter WITH Heat meter OFF
SW4 SW4-1
— — — OFF
SW4-2
— — — OFF
SW4-3
— — — OFF
SW4-4
Water circuit only operation (during installation work) *2 Inactive Active OFF
SW4-5
Emergency mode (Heater only operation) Normal Emergency mode (Heater only operation) OFF *3
SW4-6
Emergency mode (Boiler operation) Normal Emergency mode (Boiler operation) OFF *3
SW5 SW5-1
— — — OFF
SW5-2
Advanced auto adaptation Inactive Active ON
SW5-3
Capacity code
— —
ON
SW5-4
— — OFF
SW5-5
— — OFF
SW5-6
— — ON
SW5-7
— — OFF
SW5-8
— — — OFF
SW6 SW6-1
— — — OFF
SW6-2
— — — OFF
SW6-3
Pressure sensor Inactive Active ON
SW6-4
Analog output signal (0-10V) Inactive Active OFF
SW6-5
Model select Air to Water Water to Water ON
<Table 7.3.1>
<Figure 7.3.1>
SW1
SW3
SW4
SW2
SW5
SW6
Note: *1. External output (OUT11) will be available. For safety reasons, this function is not available for certain errors.
(In that case, system operation must be stopped and only the water circulation pump keeps running.)
*2. Space heating and DHW can be operated only in water circuit, like an electric boiler. (Refer to "7.4.5 Water
circuit only operation". )
*3. If emergency mode is no longer required, return the switch to OFF position.
*4. Active only when SW3-6 is set to OFF.
B-211
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW
Cylinder unit/
Hydrobox/GSHP/WTW

D
1
A
2
3
B
4
5
8
7
6C
<Figure 7.4.1> <Figure 7.4.2>
<FRONT> <RIGHT SIDE> Main remote
controller
Outputs
ECB2
Inputs or
PICV outputs
TB2
TB1
Power circuit
board
Band
*Do NOT remove
Relay connector Fastener
7.4. Field wiring
7.4.1 Electrical Connection
All electrical work should be carried out by a suitably quali-
fied technician. Failure to comply with this could lead to
electrocution, re, and death. It will also invalidate product
warranty. All wiring should be according to national wiring
regulations.
Locally supplied wiring should be inserted through the inlets
situated on the top of the heat pump unit. (Refer to <Table
7.1.1>.)
Wiring should be fed down the back right hand side of the
control and electrical box.
The wires should be inserted individually through the ca-
ble inlets as below.
Connect the power cable for the immersion heater to
ECB2.
The wires should be xed with the cable straps as below
• Immersion heater cables should use the cable strap ,
.
• Output cables should use the cable strap , , .
• Input cables, PICV power cables, and PICV output ca-
bles should use the cable strap , .
• Power cables should use the cable strap .
On completion of wiring ensure main remote controller ca-
ble is connected to the relay connector.
* Before connecting the main remote controller cable, re-
move the fastener bundling the cable between the power
circuit board and the relay connector.
Caution: Do NOT remove the band bundling the cable be-
tween the main remote controller and the relay connector,
or the heat pump unit may malfunction due to electrical
noise of the power circuit board. (See Figure 7.4.2.)
• Avoid contact between wiring and parts ( ).
• Make sure that ECB2 is ON.
• When connecting PICV, connect the terminal and
PICV
Breaker
abbreviation
Meaning
ECB2 Earth leakage circuit breaker for immersion
heater
TB1 Terminal block 1
TB2 Terminal block 2
Connections should be made to the terminals indicated in
the gures.
Immersion heater should be connected independently from
one another to dedicated power supplies.
B-212
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW

TB1
L
N
ECB2
L
N
TB2
L
N
8 7 6 5 4 3 2 1 1 2
<Figure 7.4.3>
Electrical connections 1 phase
A󰀩x label A that is included with the manuals near each wiring diagram for heat pump units.
Earth leak-
age circuit
breaker
*1 *2
Pressure
indepeadent
control valve
Wiring circuit
breaker
N.F.
Isolating
switch
Power supply
~/N 230 V 50 Hz
Power supply
~/N 230 V 50 Hz
Wiring circuit
breaker or
Isolating
switch
To control board
For
immersion heater
(DHW tank)
Description Power supply Capacity Breaker Wiring *4
Immersion heater (DHW tank) ~/N 230 V 50 Hz 3 kW 16 A *2 2.5 mm²
Water to water unit power supply ~/N 230 V 50 Hz
Water to water unit circuit breaker capacity *2 16 A
Wiring No. × size (mm²) Water to water unit power supply, earth *4 3 × Min. 1.5
Circuit rating Water to water unit L, N *3 230 V AC
Description Power supply Capacity Wiringspecication
Pressure independent control value
(PICV) *5
~/N 24 V 50 Hz 500 mA Use sheathed vinyl coated cord or cable.
Wire type: CV, CVS or equivalent
Wire size: Stranded wire 0.13 mm² to 0.52 mm²
Solid wire: ø0.4 mm to ø0.8 mm
*1.If the installed earth leakage circuit breaker does not have an over-current protection function, install a breaker with that
function along the same power line.
*2.A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*3.The values given in the table above are not always measured against the ground value.
*4.Use wires in conformity with design 60245 IEC 57.
*5.External wiring length to PICV is less than 2 m.
Note: 1. Wiring size must comply with the applicable local and national codes.
2.Install an earth longer than other cables.
3.Please keep enough output capacity of power supply for each heater. Insufficient power supply capacity
might cause chattering.
4.Stranded wire should be processed with insulation-covered bar terminal (DIN46228-4 standard compatible
type).
Breaker abbreviation Meaning
TB2 Terminal block 2
Connections should be made to the terminals indicated in Figure
7.4.4.
If connecting the PICV, attend to the following points.
• External wiring length to PICV is less than 2 m.
• Tighten the TBI 4.7 pin wiring and the PICV (0 V AC/DC) wiring
together to TB2.
Control board
<Figure 7.4.4>
Pressure Independent
Control Valve (PICV)
Control 0-10 V DC
Neutral 0 V AC/DC
Line 24 V AC/DC
TBI.4 TB2
B-213
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW
Cylinder unit/
Hydrobox/GSHP/WTW

1
2
CN108
CN01
(BK)
1
3
CN3C
(BU)
1
3
CNPWM
(WH)
1
8
CN851
(BK)
1
5
CNRF
(WH)
1
5
CN105
(RD)
1
5
CNIT
(BU)
1
2
CN20
(RD)
1
3
CN21
(YE)
1
4
CNW12
(RD)
CNW5
(BU)
1
4
CN1A
(WH)
TBI.1
LED1
LED2
LED3
LED4
TAB1
1
8
1
8
1
8
1
8
1
6
SW1
SW2
SW3
SW4
SW5
F1F2
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
7
8
1
3
1
7
1
3
1
3
CNBC
(GY)
CNBH
(WH)
CNBHT
(BK)
CNIH
(OG)
CNV1
(WH)
CNP4
(RD)
CNP1
(WH)
TBO.1
TBO.2
TBO.3.
TBO.4.
1
5
3
1
5
3
1
3
1
3
3
5
TBI.2 TBI.3 TBI.4 TBI.5 TBI.6
12345678 12345678 12345678 12345678 12345678 12345678
1
4
1
5
SW6
CN22
(BU)
7.4.2 Connecting inputs/outputs
Signal inputs
Item Name Modelandspecications
Signal input
function
Signal input
wire
Use sheathed vinyl coated cord or cable.
Max. 30 m
Wire type: CV, CVS or equivalent
Wire size: Stranded wire 0.13 mm² to 0.52 mm²
Solid wire: ø0.4 mm to ø0.8 mm
Switch Non-voltage “a” contact signals
Remote switch: minimum applicable load 12V DC, 1mA
Wiringspecicationandlocalsupplyparts
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 7-8 — Room thermostat 1 input *1 Refer to SW2-1 in <7.3.1 DIP Switch Functions>.
IN2 TBI.1 5-6 — Flow switch 1 input Refer to SW2-2 in <7.3.1 DIP Switch Functions>.
IN3 TBI.1 3-4 — Flow switch 2 input (Zone1) Refer to SW3-2 in <7.3.1 DIP Switch Functions>.
IN4 TBI.1 1-2 — Demand control input Normal Heat source OFF/ Boiler operation *3
IN5 TBI.2 7-8 — Outdoor thermostat input *2 Standard operation Heater operation/ Boiler operation *3
IN6 TBI.2 5-6 — Room thermostat 2 input *1 Refer to SW3-1 in <7.3.1 DIP Switch Functions>.
IN7 TBI.2 3-4 — Flow switch 3 input (Zone2) Refer to SW3-2 in <7.3.1 DIP Switch Functions>.
IN8 TBI.3 7-8 — Electric energy meter 1
*4IN9 TBI.3 5-6 — Electric energy meter 2
IN10 TBI.2 1-2 — Heat meter
IN11 TBI.3 3-4 — Smart grid ready input *5
IN12 TBI.3 1-2 —
INA1 TBI.4 1-3 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.
*4. Connectable electric energy meter and heat meter
● Pulse type
Voltage free contact for 12VDC detection by FTC (TBI.2 1pin ,TBI.3 5 and 7 pins have a positive voltage.)
● Pulse duration Minimum ON time: 40ms
Minimum OFF time: 100ms
●
Possible unit of pulse 0.1 pulse/kWh 1 pulse/kWh 10 pulse/kWh
100 pulse/kWh 1000 pulse/kWh
Those values can be set by the main remote controller. (Refer to the menu tree in "Main remote controller".)
*5. As for the SG ready, refer to "Smart grid ready" in 7.7 System setup.
<Figure 7.4.5>
Note:
Stranded wire should be processed with insulation-covered bar
terminal (DIN46228-4 standard compatible type).
B-214
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW

Thermistor inputs
Name Terminal block Connector Item Optional part model
TH1 — CN20 Thermistor (Room temp.) (Option) PAC-SE41TS-E
TH2 — CN21 Thermistor (Ref. liquid temp.) —
THW1 — CNW12 1-2 Thermistor (Flow water temp.) —
THW2 — CNW12 3-4 Thermistor (Return water temp.) —
THW5A — CNW5 1-2 Thermistor (DHW tank upper water temp.) —
THW5B — CNW5 3-4 Thermistor (DHW tank lower water temp.) —
THW6 TBI.5 7-8 — Thermistor (Zone1 ow water temp.) (Option) *1 PAC-TH011-E
THW7 TBI.5 5-6 — Thermistor (Zone1 return water temp.) (Option) *1
THW8 TBI.5 3-4 — Thermistor (Zone2 ow water temp.) (Option) *1 PAC-TH011-E
THW9 TBI.5 1-2 — Thermistor (Zone2 return water temp.) (Option) *1
THW10 TBI.6 5-6 — Thermistor (Mixing tank water temp.) PAC-TH012HT-E
THWB1 TBI.6 7-8 — Thermistor (Boiler ow water temp.) (Option) *1
Ensure to wire thermistor wirings away from the power line and/or OUT1 to 15 wirings.
*1. The maximum length of the thermistor wiring is 30 m. When the wires are wired to adjacent terminals, use ring
terminals and insulate the wires.
The length of the optional thermistors are 5 m. If you need to splice and extend the wirings, following points must be carried out.
1) Connect the wirings by soldering.
2) Insulate each connecting point against dust and water. Stranded wire should be processed with insulation-cov-
ered bar terminal (DIN46228-4 standard compatible type).
B-215
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW
Cylinder unit/
Hydrobox/GSHP/WTW

1 2 3456
TBO.1
LLL NNN
OUT1 OUT2 OUT3
LN
OUT9
LN
OUT15
L
1 2 3456
TBO.2 TBO.3 1 2 3456 7 8 1 2 346
5
TBO.4
N L L N
OUT5
N L N L
OUT10 OUT16 OUT11 OUT12
N
OUT13Close Open
7 8
N L
OUT8
TBI.4 8 7
OUTA1
Tool Tool
Conductor
Conductor
Outline view Top view
How to use TBO.1 to 4
Note:
1. Do not connect multiple water circulation pumps directly to each output (OUT1, OUT2, and OUT3). In such a case,
connect them via (a) relay(s).
2. Do not connect water circulation pumps to both TBO.1 1-2 and CNP1 at the same time.
3. Connect an appropriate surge absorber to OUT10 (TBO.3 1-2) depending on the load at site.
4. Stranded wire should be processed with insulation-covered bar terminal (DIN46228-4 standard compatible type).
5. Use the same thing as the Signal input wire for OUTA1 wiring.
Item Name Modelandspecications
External output
function
Outputs
wire
Use sheathed vinyl coated cord or cable.
Max. 30 m
Wire type: CV, CVS or equivalent
Wire size: Stranded wire: 0.25 mm² to 1.5 mm²
Solid wire: ø0.57 mm to ø1.2 mm
Wiringspecicationandlocalsupplyparts
Outputs
<Figure 7.4.6>
Connect them using either way as shown above.
Name Terminal
block
Connector Item OFF ON Signal/Max current Max. total
current
OUT1 TBO.1 1-2 CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON 230V AC 0.6A Max.
3.0A
OUT2 TBO.1 3-4 —
Water circulation pump 2 output (Space heating for Zone1) OFF ON 230V AC 1.0A Max.
OUT3 TBO.1 5-6 —
Water circulation pump 3 output (Space heating for Zone2) *1
OFF ON 230V AC 1.0A Max.
2-way valve 2b output *2
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON 230V AC 0.4A Max.
OUT4 — CN851 3-way valve output
Heating DHW —
1.3A
OUT5 TBO.2 1-2 — Mixing valve output *1 Stop Close 230V AC 0.1A Max.
TBO.2 2-3 Open
OUT6 — — — — — —
OUT7 — — — — — —
OUT8 TBO.4 7-8 — — — — —
OUT9 TBO.4 5-6 CNIH Immersion heater output — — 230V AC 0.1A Max.
(Relay)
OUT11 TBO.3 5-6 — Error output
Normal Error 230V AC 0.5A Max.
OUT12 TBO.3 7-8 — — — — —
OUT13 TBO.4 3-4 — 2-way valve 2a output *2 OFF ON 230V AC 0.1A Max.
OUT15 TBO.4 1-2 — Comp ON signal OFF ON 230V AC 0.5A Max.
OUT10 TBO.3 1-2 — Boiler output OFF ON non-voltage contact
·220-240V AC (30V
DC)
0.5A or less
·10mA 5V DC or
more
—
OUT16 TBO.3 3-4 — Heating thermo ON signal OFF ON
OUTA1 TBI.4 7-8 — Analog output (PICV Output) OFF ON 0-10V DC 5mA max. —
Donotconnecttotheterminalsthatareindicatedas“—”inthe“Terminalblock”eld.
*1 For 2-zone temperature control.
*2 For 2-zone valve ON/OFF control.
B-216
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW

N L
FTC
TBO.2
123
A
B
7.4.3 Wiring for 2-zone temperature control
Connect the pipe work and locally supplied parts according to
the relevant circuit diagram shown “7.5.3 Local system 1”.
<Mixing valve>
Connect the signal line to open Port A (hot water inlet port) to
TBO. 2-3 (Open), the signal line to open Port B (cold water
inlet port) to TBO. 2-1 (Close) , and the neutral terminal wire
to TBO. 2-2 (N).
<Thermistor>
• Do not install the thermistors on the mixing tank.
• Install the Zone2 ow temp. thermistor (THW8) near the mix-
ing valve.
• The maximum length of the thermistor wiring is 30 m.
• The length of the optional thermistors are 5 m. If you need to
splice and extend the wirings, following points must be car-
ried out.
1) Connect the wirings by soldering.
2) Insulate each connecting point against dust and water.
Note:
Do not install the thermistors on the mixing tank. This
coulda󰀨ectcorrectmonitoringofowandreturntempera-
tures through each zone.
InstalltheZone2owtemp.thermistor(THW8)nearthe
mixing valve.
Close N Open
from mixing
tank
to mixing
tank
to Zone2
heat emitter
from Zone2
heat emitter
Motorized
mixing valve
7.4.4 2-zone valve ON/OFF control
Opening /closing 2-way valve provides a simple 2-Zone control.
Flow temperature is common for Zone1 and 2.
1. Pipe work
2. DIP switch
Turn DIP switch 3-6 ON.
3. 2-way valve 2a (for Zone1) / 2-way valve 2b (for Zone2)
Electrically wire 2-way valve 2a and 2b to the appropriate
external output terminals. (Refer to "External outputs" in 7.4.2)
4. Room thermostat connection
1. Zone1 2-way valve 2a (local supply)
2. Zone2 2-way valve 2b (local supply)
3. Water circulation pump 2 (local supply) *1
4. By-pass valve (local supply) *2
*1Installaccordingtosystemintheeld.
*2 For safety protection, it is recommended to in-
stall a auto-operational (eg. mechanical spring
ie. not manual valve) by-pass valve.
Note:
Freeze stat function is deactivated whilst this
control is ON. Use anti-freeze solution to avoid
freezing, if necessary.
4
31
2
Heating operation mode Zone1 Zone2
Room temp. control
(Auto adaptation) *3
● Wireless remote controller (option)
● Room temperature thermistor (option)
● Main remote controller (remote position)
● Wireless remote controller (option)
Compensation curve or ow temp. control
● Wireless remote controller (option) *4
● Room temperature thermostat (local supply)
● Wireless remote controller (option) *4
●
Room temperature thermostat (local supply)
*3 Ensure to install the room thermostat for Zone1 in main room since the Room temp. control for Zone1 is prioritized.
*4 The wireless remote controller can be used as a thermostat.
Zone1
Zone2
B-217
Water to Water Heat Pump (WTW)
7
Cylinder unit/
Hydrobox/GSHP/WTW
Cylinder unit/
Hydrobox/GSHP/WTW