Unitary Ducted Split AC
20
Fig. 28 Electric Wiring of the Outdoor Unit(HW18048PNa-D)
5.3.8 Start-Up
CAUTION
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal injury, equipment damage or
improper operation.
To prevent compressor damage or personal injury, observe the following:
Do not overcharge system with refrigerant.
Do not operate unit in a vacuum or at negative pressure.
Do not disable low pressure switch in scroll compressor applications.
Dome temperatures may be hot.
In 3 phase applications, incorrect phasing will cause reverse rotation, resulting in elevated
noise levels, equalized pressures and reduced current draw. Correct by reversing power
connections L1 and L2 on contactor.
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the
following:
Front seating service valves are equipped with Schrader valves.
