Installation and Maintenance Manual
9
IMPORTANT
External drip trays are mandatory for units installed in plant rooms or inside roof
space. Drainage from the unit and external drip tray is the responsibility of the
installing contractor. A separate safety tray must be fitted under the unit and drained
separately.
Air Change will not accept any liability for any water damage resulting from incorrect
installation.
The unit should be installed with a positive fall to ensure water drains away freely through drain
holes provided. Drain lines must be as large as or larger than the fitting to which the line is being
connected. Ensure that drain lines are fitted to both the dump outlet as well as the overflow outlet
(if necessary). Drain lines should have a minimum fall of 20 mm per m length.
If drain lines are to be extended from the inside to the outside of the building, they must be
extended
beyond
the walls of the building to eliminate the possibility of damage caused by drain
water running down the exterior surface of the building wall.
Where drain lines are likely to be exposed to freezing temperatures or when they are subject to the
formation of condensation, the lines should be insulated.
Phase Rotation
(Applicable to PCU-D models only)
Correct phasing:
Phase sequencing: the scroll compressor is designed to operate with the motor in only one
direction.
Miswiring of 3-phase Power
Miswiring of 3-phase power (phase reversal) will cause the compressor to operate in the wrong
rotation. The compressor will damage itself if the phasing is incorrect, will not pump refrigerant and
will draw minimal current. As a result, the discharge line and pressures will be well below normal.
The unit is fitted with a PPR (Phase Protection Relay). If there is a phase reverse or phase loss,
the PPR will shut down all fans and compressor.
All 3-phase motors are phase connected and sequence tested in the factory. If fan motors are
3-phase, run the condenser fans. If they run in the correct direction, then compressors will have
correct rotation. If running backwards, the current 3-phase connection is incorrect.
IMPORTANT
Do not change phases at compressor terminal or contactor.
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz