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PTAC-SVX01C-EN 33
Maintenance
Figure 22. Refrigeration sealed system — heat pump (air conditioning
model
Figure 23. Refrigeration sealed system — Heat pump (heat pump model)
Evacuation
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
pinch-off, swag the tube and
braze in an extra length of
tubing.