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)

Outdoor Temperature

Running Time [sec]

 

 

-5˚C (23˚F) ~ -0˚C(32˚F)

90

 

 

-10˚C (14˚F) ~ -5˚C (23˚F)

180

 

 

Under -10˚C (14˚F)

300

 

 

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)

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Only for training and service purposes

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Heat Controller VMC18SB-1/VMH18SB-1 Compressor Preheating Heatpump Only, 1 9,12kBtu/h Model, 2 18, 24, 30kBtu/h Model

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