Maintenance
Evacuation
Figure 22. Refrigeration sealed system — heat pump (air conditioning model
CAUTION
Fan Motor Overheat!
Never test operation without the unit in the wall sleeve. A serious change in design specifications for air movement through the evaporator and condenser compartments, causing the fan motor to over heat and the refrigeration system to become unbalanced will occur when the unit is not installed in the wall sleeve.
CAUTION
High Temperatures!
Do not allow sludge or oil to contact skin when evacuating refrigerant from equipment. Direct contact with sludge or oil may cause minor or moderate injury.
Thoroughly evacuate the system using a high vacuum pump, capable of producing a vacuum equivalent to 50 microns and a thermocouple vacuum gauge to give a true reading of the vacuum in the system.
Note: Never use the system compressor as a vacuum pump or run when under a high vacuum. Motor damage could occur.
Evacuation Procedure
1. Connect the vacuum pump, vacuum tight manifold set with high vacuum hoses, thermocouple vacuum gauge, and charging cylinder.
2. Connect the low side line to the process tube of the compressor.
3. Connect the high side line to the process tube of the liquid line strainer.
Note: If either process tube is not long enough to receive the compression or flare fitting and still leave room for a
Figure 23. Refrigeration sealed system — Heat pump (heat pump model)
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