Table of Contents
Advertisement
7.7.3
Adding Refrigerant to System (Partial Charge)
a. Examine the unit refrigerant system for any evidence of leaks. Repair as necessary. (Refer to
b. Maintain the conditions outlined in
c. Fully backseat the suction service valve and remove the service port cap.
d. Connect charging line between suction service valve port and cylinder of refrigerant R-134a. Open VAPOR
valve.
e. Partially frontseat (turn clockwise) the suction service valve and slowly add charge until the refrigerant
appears at the proper level.
7.8
COMPRESSOR
Make sure power to the unit is OFF and power plug disconnected before replacing the
compressor.
1. The compressor should not operate in a vacuum greater than 500 mm/hg (20 inches/hg).
2. The service replacement compressor is sold without shutoff valves (but with valve pads), and without
terminal box and cover. Customer should retain the original terminal box, cover, and high pressure
switch for use on replacement compressor.
3. Check oil level in service replacement compressor. (Refer to
4. A compressor terminal wiring kit must be ordered as a separate item when ordering replacement com-
pressor. Appropriate installation instructions are included with kit.
5. Refer to
Table 7–6
6. Refer to
Figure 7.33
7.8.1
Removal and Replacement of Compressor
a. Remove the protective guard from lower section of the unit.
b. Pump down low side (refer to
from compressor using a refrigerant recovery system.
c. Locate the compressor junction box. Tag and disconnect wiring from compressor terminals and remove
compressor junction box.
d. Loosen service valve mounting bolts, break seal and then remove bolts.
e. Remove compressor plate mounting bolts.
f. Remove compressor and mounting plate. Refer to
g. Remove high pressure switch (HPS) from compressor and check operation of switch (refer to
T-316
Section
7.7.1.
WARNING
!
NOTES
and
Table 7–7
for applicable compressor wear limits and torque values.
for charts on compressor pressure, temperature and motor current curves.
Section
7.4) or frontseat compressor service valves and remove refrigerant
Section
Section 3.2
for weight of compressor.
7–8
Section
7.8.6.)
Section
7.5.)
7.9.2).
Hide quick links:
Advertisement
Table of Contents
