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O&I manual

5. ELECTRIC WIRING

5.2 Power supply specification

Table 5-1

Outdoor power supply

Power
supply

Manual
switch

Fuse

Wiring

Item

Model

220V 3N
~ 60Hz

250A

220A

According to
the actual
distance of
wiring,70mm

or lager for
each unit.

ICHS-420KC-5

5.3.1 No additional control components are required in the
electric cabinet (such as relay, and so on), and the power supply
and control wires not connected with the electric cabinet are not
allowed to go through the electric box. Otherwise, electromag-
netic interference may cause failure of the unit and control
components and even damages to them, which thus lead to
protective failure.
5.3.2 All cables led to the electric box should be supported
independently but by the electric box.
5.3.3 The strong current wires generally pass the electric box,
and 220-230V alternating current may also pass the control
board, so wiring connection should conform to the principle of
separation of strong current and weak current, and the wires of
power supply should be kept more than 100 mm away from the
control wires.
5.3.4 Only use 220V 3N~ 60Hz rated power supply for the unit,
and the maximum allowable range of voltage is 198V~242V.
5.3.5 All electric wires must conform to local wiring connection
norm. The suitable cables should be connected to power supply
terminal through wiring connection holes at the bottom of the
electric cabinet. According to Chinese standard, the user is
responsible for providing voltage and current protection for the
input power supply of the unit.

5.3 Requirements of wiring connection

5.3.6 All power supplies connected to the unit must pass one
manual switch, to ensure that the voltages on all nodes of
electric circuit of the unit are released when the switch is cut off.
5.3.7 The cables of correct specification must be used to supply
power for the unit. The unit should use independent power
supply, and the unit is not allowed to use the same power supply
together with other electric devices, to avoid over-load danger.
The fuse or manual switch of the power supply should be
compatible with working voltage and current of the unit. In case
of parallel connection of multiple modules, the requirements of
wiring connection mode and configuration parameters for the
unit are shown in the following figure.
5.3.8 Some connection ports in the electric box are switch
signals, for which the user needs to provide power, and the rated
voltage of the power should be 220-230VAC. The user must be
aware that all power supplies they provided should be obtained
through power circuit breakers (provided by the user), to ensure
that all voltages on the nodes of the provided power supply
circuit are released when the circuit breakers are cut off.
5.3.9 All inductive components provided by the user (such as
coils of contactor, relay, and so on) must be suppressed with
standard resistance-capacitance suppressors, to avoid
electromagnetic interference, thus leading to failure of the unit
and its controller and even damages to them.
5.3.10 All weak current wires led to the electric box must apply
shielded wires, which must be provided with grounding wires.
The shield wires and power supply wires should be laid
separately, to avoid electromagnetic interference.
5.3.11 The unit must be provided with grounding wires, which
are not allowed to be connected with the grounding wires of gas
fuel pipelines, water pipelines, lightning conductors or
telephones. Improper earth connection may cause electric
shock, so please check whether earth connection of the unit is
firm or not frequently.

Outdoor power supply

Outdoor
unit 1

Outdoor
unit 2

Outdoor
unit 3

Outdoor
unit 4

Outdoor
unit N

Manual switch

Only 8 modular units can be combined at most.

NOTE

5.4 Wiring steps

Step 1. Check the unit and ensure that it is connected with
grounding wires correctly, to avoid leakage, and the grounding
devices should be mounted in strict accordance with the
requirements of electrical engineering rules. The grounding
wires can prevent electric shock.
Step 2. The control box of the main power switch must be
mounted in a proper position.
Step 3. Wiring connection holes of the main power should be
provided with glue cushion.
Step 4. The main power and neutral wires and grounding
wires of power supply are led into the electric box of the unit.

Fig. 5-1

5.1 Electric wiring

1. The air-conditioner should apply special power supply, whose
voltage should conform to rated voltage.
2. Wiring construction must be conducted by the professional
technicians according to the labeling on the circuit diagram.
3. The power wire and the grounding wire must be connected
the suitable terminals.
4. The power wire and the grounding wire must be fasten up by
suitable tools.
5. The terminals connected the power wire and the grounding
wire must be fully fastened and regularly checked, in case to
become flexible.
6. Only use the electric components specified by our company,
and require installation and technical services from the
manufacturer or authorized dealer. If wiring connection fails to
conform to electric installation norm, failure of the controller,
electronic shock, and so on may be caused.
7. The connected fixed wires must be equipped with full
switching-off devices with at least 3mm contact separation.
8. Set leakage protective devices according to the requirements
of national technical standard about electric equipment.
9. After completing all wiring construction, conduct careful check
before connecting the power supply.
10. Please carefully read the labels on the electric cabinet.
11. The user’s attempt to repair the controller is prohibited, since
improper repair may cause electric shock, damages to the
controller, and so on. If the user has any requirement of repair,
please contact the maintenance center.