McQuay MQS-174018-CFC216A Installation And Operation Manual page 31

communication cord and the power cable into the terminal board.
The power cord and the wire of the fresh air valve are high-voltage, while the communication cord
①.
and connection wire of the wired controller are low-voltage. They should run separately against
electromagnetic interference.
The high-voltage and low-voltage lines should pass through the rubber rings at different electric box
②.
covers.
Do not bundle the connection wire of the wired controller and the communication cord together, or
③.
arrange them in parallel, otherwise improper operation would occur.
The high-voltage and low-voltage lines should be fixed separately and securely, with internal big
④.
clamps for the former and small clamps for the latter.
Tighten the indoor/outdoor connection cord and power cord respectively on the terminal boards with
⑤.
screws. Faulty connection may cause a fire.
If the indoor unit connection cord (to the outdoor unit) and power supply are wired incorrectly, the air
⑥.
conditioner may be damaged.
Connect the indoor unit connection cord properly based on the corresponding marks as shown in
⑦.
Fig. 4.29.
Ground both the indoor and outdoor units by attaching a ground wire.
⑧.
Unit shall be grounded in compliance with the applicable local and national codes.
⑨.
(6). Electric wiring of outdoor unit side
Note: When connecting the power supply cord, 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.
DC Inverter U-match Series Floor Ceiling Type Unit
Fig. 4.30
CAUTION!
29