15
Electrical Installation
Electrical Wiring
•
Connect the power wire to the main terminal board (TB) of the distribution box for the unit.
•
Connect the control panel with the main control board of the unit through the control panel
(indoor mounted) connecting cable. See pages 18-24.
•
If the unit is not provided with the water pump, connect the control wire of the chilled water
pump to the corresponding terminal of the chilled water pump.
•
Ground the unit, the chilled water pump motor (for the unit with water pump) and all devices
to be grounded.
•
If the electric heater is provided, connect the power wire and the control wire to the terminal
TB2 of the electric heater.
•
If the two-way valve of the fan coil is used for interlocking control, it is necessary to set SW2-
7(N Type) or SW1-7(H Type) to
“
ON
”
on the control board and connect the interlocking point
(dry contact) between the control box terminals 12(N Type) or 19(H Type) and U.
•
Connect the flow switch between the control box connecting terminals U and 15 of the unit.
Warning
•
To prevent injury or death, disconnect electrical power supply before completing wiring
connections to the unit.
Caution
•
The terminals can be connected only through the copper conductors so as to avoid corrosion
or overheating. Refer to the electrical parameter table for the minimum current, the fuse
specifications and the electrical specifications of the motor.
Power Supply
Please refer to the wiring diagram on the cover plate of the control box for the unit. The installer
shall provide a power supply with correct voltage and a suitable breaker for the unit. The
variation of input power should be limited at
±
10%.
Cautions
For the 380V~ unit adopts the scroll compressor, the phase reversing and loss protection
controller is installed which should be checked with electricity connection before start-up.
If the green light of the phase reversing and loss protection controller in the control box is on, it
means the phase sequence is right; red light being on means the phases of power wiring should
be exchanged; and the yellow light means lacking phase which need check with electricity
disconnection.
In any case that the phases are reversed or lacked, the unit will shut down its operation and
start-up automatically.
