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Only for training and service purposes
Part 2 Functions & Controls
5.5 Compressor Preheating Heatpump Only
5.5.1 9,12kBtu/h Model
With low outdoor temperature, preheating the compressor compressor is neccessary to maintain the oil viscosi-
ty before the unit starts.
The preheating Mode preheats the compressor motor coil/windings by electric current without compressor run-
ning.
Mode-in conditions : Outdoor temp. < 0˚C (32˚F) and Discharge pipe temp < 15˚C (59˚F)
Mode-out conditions : Outdoor temp. > 5˚C (41˚F) or Discharge pipe temp < 25˚C (77˚F) or Compressor on
5.5.2 18, 24, 30kBtu/h Model
When the unit starts with low outdoor temperature, preheating the compressor is neccessary to maintain the oil
viscosity.
upper case Under the following conditions, the compressor runs at 15Hz for a specific time
Conditions : heat sink temperature < 0˚C (32˚F) and Discharge pipe temp < 0˚C (32˚F)
5.6 Sump Heater Control (9, 12kBtu/h Model Only) Heatpump Only
With low outdoor temperature, the sump heater located on base panel prevents icing that may cause drain
blockage and fan damage.
Heater-on conditions : Outdoor temp. ≤ 0˚C (32˚F) and heating mode
Heater-out conditions : Outdoor temp. > 1˚C (34˚F)
-5˚C (23˚F) ~ -0˚C(32˚F) 90
-10˚C (14˚F) ~ -5˚C (23˚F) 180
Under -10˚C (14˚F) 300
Outdoor Temperature Running Time [sec]