Use and Care Manual

27
① .
The fresh air damper and power wires are high-voltage, while the communication wire
and wired controller are low-voltage. They should be run separately to avoid
electromagnetic interference.
② .
High-voltage and low-voltage lines should enter the electrical control box though separate access
holes.
③ .
Do not bundle the wired controller and the communication wire together, or
arrange them in parallel, otherwise improper operation would occur.
④ .
High-voltage and low-voltage lines should be xed separately and securely, with internal big
clamps for the former and small clamps for the latter.
⑤ .
Tighten the indoor/outdoor communication wires and power wire respectively on the terminal boards with
screws. Faulty connection may cause a re.
⑥ . 
If the communication wires of indoor unit (to the outdoor unit) and power wire are connected incorrectly,
the air conditioner may be damaged.
⑦ . 
Connect the communication wires of indoor unit properly based on the corresponding marks as shown in
shown in Fig. 4.39.
⑧ .
Properly ground both indoor and outdoor units directly to an earth ground.
⑨ .
Unit shall be grounded in compliance with the applicable local and national codes.
(6). Electric wiring of outdoor unit
NOTICE! When connecting the power wire, make sure that the phase of the power
supply matches with the exact terminal board. If not, the compressor will rotate reversely
and run improperly.
Remove the big handle (18~30K) /front panel (36~48K) of the outdoor unit and insert the end
of the communication wire and the power wire into the terminal board.
Single phase:
18K~24K
36K~48K
Fig. 4.41
U-match Series Cassette Type Unit