Lennox AIRCOOLAIR KNCK 24E Installation, Operation & Maintenance Manual page 24

REMEMBER THAT THE COMPRESSOR IS A SCROLL TYPE COMPRESSOR:
Scroll type compressors only compress in one direction of the rotation. Single phase models are always
started up in the proper direction; however, the three phase models, turn in either direction depending on
the order of the power supply phases. Therefore, it is essential that the phase connection for scroll-type
three-phase compressors be carried out correctly (the correct direction of rotation can be checked when
the pressure on the suction side decreases and the pressure on the discharge side increases when the
compressor is activated). If the connection is wrong, the rotation will be reversed causing a high noise
level and a reduction in the amount of current consumed. If this occurs, the compressor’s internal protection
system will kick in shutting down the unit. The solution is to disconnect, switch the wires between two of
the phases and connect again).
- Remember the low pressure switch is reset automatically and the high pressure switch is reset electronically.
fill out the
Commissioning Sheet