184
Installation
8.4.10.3
TERMINAL BOARD CONNECTIONS
8.3.10.3.1 WIRING OF UNIT AND CONTROLLER
The transmission is wired to terminals A-B.
The H-NET wiring system requires only two
transmission cables that connect the unit and the
controller.
The shielding layer shall be grounded.
Outdoor unit
Controller
TB4 on PCB4
Fixed clamps
Shielded cable
A B
Use twisted pair cables (0.75 mm²) for transmission
wiring between the unit and controller. The wiring must
consist of 2-core wires (Do not use wire with more than
3 cores).
Use shielded wires for transmission wiring to protect
the units from noise interference, with a length of less
than 300 m and a size in compliance with local codes.
Connect the shielding layer to ground.
live part that could damage the PCB.
8.3.10.3.2 WIRING OF MAIN POWER SUPPLY
The main power supply connection is wired to the terminal
board (TB1) as follows:
Terminal board
Earth leakage
breaker
Fixed clamps
: Power supply cables
: Transmission cables
: Field supplied, not
contained in the unit
Connect power line and earth wire to the harness.
Check and ensure live line and null line of terminal boards in
power supply are correctly linked.
If connected inversely, some parts may be damaged.
8.3.10.3.3 WIRING OF DHW ELECTRIC HEATER
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 Electric heater
THe1
Temperature protection switch
/ Temperature fuse
Connected in the DHW electric heater
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
the power supply DHW electric heater.
Protection value
80°C
AR4 AC contactor (repeater)
Selection according to
FU Fuse
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