68
OCH714D
Part Name
Checkpoints
Water circulation pump
(sanitary circuit)
Measure the resistance between the terminals with a multimeter.
(Winding temperate 20°C)
Terminal
Normal (speed 2)
Abnormal
L-N
211 Ω
Open or Short
DHW circulation pump MUST be set to speed 2.
Immersion heater
Measure the resistance between the terminals with a multimeter.
(Winding temperate 20°C)
Terminal
Normal
Abnormal
A-B
19.2 Ω
Open or Short
To reset the immersion heater use a pin or similar to press the reset button lo-
cated on the top of the immersion boss.
See diagram on the left.
Flow sensor
Booster heater
Measure the resistance between the terminals with a multimeter.
Thermostat (90°C) and thermal cut out (121°C)
90 °C
Manual reset
water
thermostat
121 °C
Thermal
cut-out
AWG18
AWG18
9
10
Terminal
Normal
Abnormal
9–10
110(±35) mΩ
Open or Short
2 kW heater (230 V, 1 phase)
1
2
2 kW
AWG15 FEP WHITE
AWG15 FEP WHITE
Terminal
Normal
Abnormal
1–2
26.5(+3/−1.3) Ω
Open or Short
2 + 4 kW heater (230 V, 1 phase)
1
2
2 kW
AWG15 FEP WHITE
AWG15 FEP WHITE
3
4
2 kW
AWG13 FEP BLUE
AWG13 FEP BLUE
2 kW
Terminal
Normal
Abnormal
1–2
26.5(+3/−1.3) Ω
Open or Short
3–4
13.3(+1.5/−0.6) Ω
Open or Short
3 + 6 kW heater (400 V, 3 phase)
5
6
AWG13 FEP BLUE
AWG13 FEP BLUE
AWG15 FEP WHITE
2 kW
4
AWG13 FEP BLUE
2 kW
2 kW
2
3
1 kW
1
1 kW
1 kW
AWG15 FEP WHITE
AWG15 FEP WHITE
Terminal
Normal
Abnormal
1−2=2-3=1−3
105.8(+11.8/−5) Ω
Open or Short
4−5=5-6=4−6
52.9(+5.8/−2.5) Ω
Open or Short
3 + 6 kW heater (230 V, 3 phase)
Terminal
Normal
Abnormal
1−2=2-3=3−1
35.3(+3.9/−1.8) Ω
Open or Short
4−5=5-6=6−4
17.6(+1.9/−0.9) Ω
Open or Short
L N
M
1~
1
2
3
4
BK
WH
BU
BN
SENSOR
5 VDC
Vout
MICRO
PROCESSOR
FTC CONTROLLER BOARD
4
-
3
: 5 V (DC)
2
-
3
: Output Vout (DC)
WITHOUT SIGNAL
CN1A WH
Flow signal
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
20
40
60
80
100
Flow [L/min]
Flow output signal
[V]
0.35 V
5
6
AWG13 FEP BLUE
AWG13 FEP BLUE
AWG15 FEP WHITE
4
AWG13 FEP BLUE
2 kW
2 kW
2
3
1
1 kW
1 kW
AWG15 FEP WHITE
AWG15 FEP WHITE
2 kW
1 kW
