Carrier PC211 Start-Up, Operation And Maintenance Instructions Manual page 185

To Read Refrigerant Pressures
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
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,
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.
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,
during pumpout or leak testing:
Figure 28, and Figure 37
!
CAUTION
Figure 27, and Figure
(Figure
for valve locations and numbers.
28.
8) by removing the pressure