80
Installation
8.1.9.3.3
Wiring of DHW
The electric heater of the DHW tank needs to meet the relevant
requirements of local laws and regulations. It is necessary to protect
it through a temperature fuse and a temperature protection switch.
1 Electric heater power ≤ 3 kW.
Power line connection should give concern to live line and
null line, and be grounded strictly.
2 Electric heater power > 3 kW.
When the capacity of the electric heater is greater than 3 kW,
the terminal HL/HN only provides control signals to control
the ON/OFF of the AC contactor.
Codes Indications
Recommended
parameters
DHW EH DHW electric heater assembly
EH DHW electric heater
THe1
Temperature protection switch
/ Temperature fuse
Connected in the DHW electric heater
the power supply of DHW electric
heater when DHW temperature
exceeds the protection value.
Protection value
90 °C
THe2
Temperature protection switch
(Auto restore)
When DHW temperature exceeds
the protection value, the temperature
protection switch open, and auto
restore when DHW temperature
reduce below the protection value.
The unit can detect this temperature
protection switch is open and cuts
heater.
Protection value
80 °C
AR4 AC contactor (repeater)
Selection according
to EH (DHW)
FU Fuse
according to national regulations.
Correctly mount cable water proof head and electrical box
cover, preventing short circuit caused by water intruding into
electrical box.
To install the DHW electric heater which power is
Power
Source
Rated
Current
Power Source
Cable Size
EN60335-1*
DHW tank
power supply
220V-240V
~ 50Hz
15A 3 × 2.5mm
2
DHW tank
temperature
switch
220V-240V
~ 50Hz
- 2 × 0.75~2.5mm
2
*
Code designation 60245 IEC 57
a.
Installation of on-site wire must complies with applicable
legislation.
b.
When power line is connected in series, total current value
Thermistor of DHW tank is weak current signal, preventing
mixed with strong current signal.
The DHW tank must have temperature protection devices
recommended in this section to ensure the power supply of
temperature is too high.
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