GMC 1976 ZEO 6083 Maintenance Manual page 751

24E- 12
ROOF MOUNTED AIR CONDITIONER
Figure 1 5-Torch Type Leak Detector Figure 16-Electronic Leak Detector
Problem Remedy
7 . Leak test . 7. Shut off the compressor and charge the system
with refrigerant to about 150 pounds . If you use
the torch type detector J-6084 (figure 15), the
reactor plate in the detector must be red hot
during use and needs replacement when the copper
burns away, about every two weeks under normal
use. Move the tester probe slowly around all pos-
sible leakage points and watch the flame for a
color change . With an electronic detector J-23400-
01 (figure 16), listen for the signal . Refrigerant
is heavier than air, so it may not be detectable
directly above a leak, but only beneath it.
8. Burnout check. 8. During a compressor replacement, check the oil
for evidence of an electrical burnout.
WARNING: DO NOT GET OIL ON YOUR HANDS.
IF ACID HAS FORMED SEVERE BURNS CAN RE-
SULT.
A dark oil with burnt odor means the system is
contaminated . Remove the capillary tube and dryer
as well as the compressor. Backflush the evapora-
tor and condenser with a pound of refrigerant or
commercial flushing agent such as "purge" . Replace
any plugged tubes. Then thoroughly evacuate the
system before charging it .