16 | Start-Up LV Heat Pump Series
LV Heat Pump Series8 733 944 336 (2016/09) Subject to change without prior notice
Scroll Compressor Rotation (4 and 5
Tons only)
It is important to be certain that the compressor is
rotating in the proper direction. To determine whether
or not compressor is rotating in the proper direction see
as follows:
1. Connect services gases to suction and discharge
pressure fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge
pressure should rise, as is normal on any start up.
If the suction pressure does not drop and the discharge
pressure does not rise to normal levels:
1. Turn off power to the unit. Install disconnect tag.
2. Reverse any two of the unit power leads.
3. Reapply power to the unit and verify pressures are
correct.
The suction and discharge pressure levels should now
move to their normal start-up levels.
When the compressor is rotating in the wrong direction,
the unit makes more noise and does not provide cooling.
After a few minutes of reverse operation, the scroll
compressor internal overload protection will open, thus
activating the unit lockout. This requires a manual reset.
To reset, turn the thermostat on and then off.
Two factors determine the operating limits of a unit:
entering air temperature and water temperature.
Whenever any of these factors are at a minimum or
maximum level, the other two factors must be at a
normal level to ensure proper unit operation.
There is a 5 minute time delay before the compressor
will start.
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