Service manual

5-12
Sealed System
Figure 5-4. Installation of Recovery Equipment
6. As soon as refrigerant in sight glass has gone down
to predetermined level, close charging cylinder valve.
7. Allow system to sit for five minutes.
8. Turn on refrigerator compressor. Run compressor for
a few minutes and monitor system pressures.
9. When satisfied that the unit is operating correctly,
clamp the high-side process tube with the pinch-off
tool while the unit is still running.
Final Leak Test
1. With the refrigerator turned OFF leak test all
low-side system components.
2. Turn the unit ON and run until the condenser is
warm. Leak test the high-side system components.
Charging The System
Preparing The Charging Cylinder:
1. Make certain that hand shut-off valve to vacuum
pump is closed.
2. Close high-side manifold gauge valve.
3. Set charging cylinder scale to pressure indicated on
cylinder pressure gauge.
4. Observe refrigerant level in sight glass. Subtract
amount to be charged into system and note shut off
point.
5. Open charging cylinder valve slowly and allow
proper charge to enter system.
Check the serial plate for the correct refrigerant
type. It is extremely important to verify the type of
refrigerant in the system before starting any sealed
system repairs. After charging the system with
liquid be certain to wait at least 5 minutes before
starting the compressor to give the refrigerant
a chance to disperse throughout the system.
Otherwise the compressor could be damaged by
attempting to pump excessive quantities of liquid.
DISCONNECT THE CHARGING CYLINDER HEATER
AT THIS TIME TO PREVENT THE CYLINDER
PRESSURE FROM EXCEEDING ITS MAXIMUM
LIMITS.