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7
Water to Water Heat Pump (WTW)
7.2. Wiring diagrams
EHWT17D-MHEDW
CN401
CNW5
CNW12
CN21
CN20
(WH)
(BU)
(RD)
(YE)
(RD)
TBI.1
8
7
1
4
1
4
1
1
3
4
1
2
t° t°
t° t°
t° t°
to (*7)
to C.B.
relay connector
THW5A
THW5B
TH1
IN1
(*2)
Cautions when Servicing
•
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.
Insulation resistance of the compressor
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.
B-210
Immersion heater (1Ph3kW)
Power supply
to Immersion heater
~/N 230V 50Hz
L
N
(1)
(3)
ECB2
2
4
IHC
1
3
5
A1
2
4
6
A2
A
B
θ
θ
IHT
IH
2
TBI.2
TBI.3
TBI.4
6
5
4
3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
+ -
- +
- + - +
IN2
IN3
IN4
IN5
IN6
IN7
IN10
IN8
IN9
IN11
IN12
THW1 THW2
t°
to FTC board
C.B.
1
3
1
TH33
TH32
(YE)
(BK)
CNF1
1
7
(WH)
1
2
3
TRANS
CNDC
(PK)
CNS
3
1
(WH)
W
MS
V
3~
U
MC
CNPWM
(WH)
1
3
CNP1
TBO.1
(WH)
3
1
X1
1
M
1~
2
MP1
3
X2
3
M
1~
M
4
1~
MP2
X3
5
2WV2b
6
M
X14
1~
1
M
MP3
1~
MP4
3
CNP4
(RD)
TBO.2
X5A
Close
1
N
M
2
1~
Open
X5B
MXV
3
4
5
6
X4
CNV1
(WH)
1
3
5
TBO.3
X10
1
Signal output
1
(Boiler)
2
CNIH
X16
(OG)
3
3
Signal output
(thermo on)
4
X11
5
Signal output
(Error)
6
X12
7
8
TBO.4
X15
1
Signal output
(Comp. on)
2
X13
3
M
1~
4
2WV2a
X9
1
5
6
3
X8
CNIH
7
(OG)
8
1
CNBHT
DT
1
(BK)
3
3
CNBC
(GY)
TB2
1
2
TBI.5
TBI.6
TAB1
4
3
2
1
8
7
6
6
5
5
4
4
3
3
2
2
1
1
8
7
6
5
4
3
2
1
CN1A
(WH)
CN22
(BU)
1
4
2
1
to (*4)
t° t°
t° t°
t° t°
t° t°
t° t°
t° t°
THW6 THW7 THW8 THW9
THWB1 THW10
Pressure Independent
Control Valve
TH2 TH33 TH32 TH3 TH4 TH34
63L
63H
t°
t°
t°
t°
t°
t°
t°
(*2)
TH7
to (*3)
t°
2
1
1 2
2 1
1
3
2 1
4
TH4
63HS
TH34
TH7/6
TH3
1
5
(WH)
(WH)
(RD)
LEV-A
(RD)
(WH)
(WH)
1
3
1
3
63L
63H
(RD)
(YE)
1
CNM
LED2
LED1
(WH)
CN4
CN2
(WH)
(RD)
1
7
1
2
2
7
F3
CNAC
(WH)
1
2
F4
1
3
SV1/CH
1
(GY)
3
4
TH8
2
P.B.
t°
CNAC2
(RD)
1 2
1 2
CN6
CN4
(WH)
(WH)
2
IC600
BK
W
CNDC
(PK)
WH
V
1
3
RD
U
IC500
DS
~
7
1
CN2
7
(RD)
TB1A
TB3A
DCL
1
2
1
3
4
3
CN01
(BK)
1
3
F1
5
F2
<How to use TBO.1 to 4>
Connect them using either way as shown below.
Tool
Tool
Conductor
Conductor
Outline view
Top view
FTC
TBO.1
1
2
3
1
CNP1
F2
4
(WH)
3
5
6
1
1
CNP4
1
TBO.2
(RD)
3
LED1
2
SW5
3
4
5
8
6
1
1
CNV1
3
(WH)
1
TBO.3
5
SW4
2
3
6
4
1
5
6
7
SW3
LED2
8
TBO.4
1
8
2
1
LED3
3
4
5
SW2
6
7
8
8
1
CNI H
1
(OG)
1
3
SW1
SW6
5
1
1
CNBC
CNBHT
(GY)
(BK)
8
3
3
LED4
TAB1
CN401
CN1A
CNW5
CNW12
(WH)
(WH)
(BU)
(RD)
1
1
1
1
4
4
4
4
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
TBI.1
TBI.2
TBI.3
TBI.4
TBI.5
Symbols used in wiring diagram are,
: connector,
: terminal block
LEV-A
M M
5
CN1A
63HS
CN401
to (*6)
to (*3)
to (*4)
to (*7)
to (*5)
*1 MODEL SELECT
*1
*1
The black square (■) indicates a switch position.
SW5
MODEL
ON
ON
EHWT17D-
MHEDW
OFF
OFF
1
2
3
4
5
6
14
1
3
CNDM
(WH)
3
SV3/SS
1
3
21S4
(WH)
(GN)
CNAC1
LI
NI
(WH)
1
3
1
3
E2
EI
E3
~
E4
L
TB1
POWER SUPPLY
~/N 230V 50Hz
1
CN01
3
(BK)
5
F1
1
CN3C
(BU)
3
1
CNPWM
(WH)
3
1
3WV
CN851
M
(BK)
8
1
CNRF
Wireless receiver
(WH)
(Option)
5
1
CN105
WiFi adapter
(RD)
(Option)
5
1
CNIT
(BU)
5
CN22
1
(BU)
2
CN108
CN21
CN20
(YE)
(RD)
1
1
2
3
2
1
8
7
6
5
4
3
2
1
TBI.6
SW6
1
2
3
4
5
6
7
8
N
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