Carrier 19XL - Manual (Page 185)

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.