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To Read Refrigerant Pressures
during pumpout or leak testing:
1.
The LID display on the machine control center is suitable for determining refrigerant-side
pressures and low (soft) vacuum. For evacuation or dehydration measurement, use a
quality vacuum indicator or manometer to ensure the desired range and accuracy. This can
be placed on the Schrader connections on each vessel (Figure 8) by removing the pressure
transducer.
2.
To determine storage tank pressure, a 30 in.-0-400 psi (-101- 0-2760 kPa) gage is attached
to the vessel.
3.
Refer to Figure 27, Figure 28, and Figure 37 for valve locations and numbers.
Machines with Storage Tanks
If the machine has isolation valves, leave them open for the following procedures. The letter
‘‘C’’ describes a closed valve. Valves 9 and 10 on the storage tank are always closed. See
Figure 16, Figure 17, Figure 27, and Figure 28.
CAUTION
CAUTION
!
Transfer, addition, or removal of refrigerant in spring-isolated machines may
place severe stress on external piping if springs have not been blocked in both
up and down directions.