Carrier 17, Руководство по запуску и эксплуатации, Страница: 64 / 116

PUMPOUT AND REFRIGERANT TRANSFER
PROCEDURES
Preparation —
The 17/19EX may come equipped with
an optional pumpout compressor. The refrigerant can be pumped
for service work to either the cooler/condenser/compressor
sections or the utility vessel by using the pumpout system.
The following procedures are used to describe how to trans-
fer refrigerant from vessel to vessel and perform machine
evacuations.
Operating the Optional Pumpout Compressor
1. Be sure that the suction and the discharge service valves
on the optional pumpout compressor are open (back seated)
during operation. Figure 32 shows the location of these
valves. Rotate the valve stem fully counterclockwise to
open. Front seating the valve closes the refrigerant line
and opens the gage port to compressor pressure.
2. Make sure that the compressor holddown bolts have been
loosened to allow free spring travel.
3. Open the refrigerant inlet valve on the pumpout compressor.
4. Oil should be visible in the compressor sight glass under
all operating conditions and during shutdown. If oil is
low, add oil as described under Pumpout System Main-
tenance section, page 82. The pumpout unit control wir-
ing schematic is detailed in Fig. 33. The Optional Pum-
pout System is detailed in Fig. 34.
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 (Fig. 7 and 8) by
removing the pressure transducer.
2. To determine utility vessel pressure, a 30 in.-0-400 psi
(-101-0-2760 kPa) gage is attached to the vessel.
3. Refer to Fig. 32 for valve locations and numbers.
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.
NOTE: Location of pumpout compressor may vary depending on ma-
chine arrangement.
Fig. 32 — Pumpout Arrangement and Valve Number Locations (12-ft Vessel Shown)
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