Handling Refrlgerant-12; Handling Refrigerant Lines And Fittings - GMC G Service Manual

Metal TUbe
Outside Thread and
Diameter
1 /4
%
1 /2
%
%
1. Refrigerant-12
R/V Models.............................. 1.474 Kg (3 lbs. 4 ozs.)
G-Van (except L19 engine)....... 1.588 Kg (3 lbs.
(with L19 engine)...............
R/V Models.............................. 2.381 Kg (5 lbs. 4 ozs.)
G-Van (except L19 engine)....... 2.041 Kg (4 lbs.
(with L19 engine)............................. 1.814 Kg (4 lbs.)
2. 525 Viscosity Oil
R/V Models (with HR- ) ...................... 236.6 ml
6
(with R-4)....................................... 177.4 ml
G-Van (with A- ) .............................. 295.7 ml (10 ozs.)
6
(with R-4)....................................... 177.4 ml
R/V Models (with HR- ) ..................
6
(with R-4)....................................... 266.1 ml (9 ozs.)
G-Van (with A- ) .............................. 384.4 ml (13 ozs.)
6
(with R-4)....................................... 266.1 ml (9 ozs.)
HANDLING REFRIGERANT-12
Air conditioning systems contain Refrigerant-12, a
chemical which requires special handling to avoid personal
injury.
Always wear goggles and wrap a clean cloth around
fittings, valves and connections when opening the system.
Work in a ventilated area and do not weld or steam clean
near air conditioning lines or components.
Refrigerant-12 drums are shipped with a metal screw
cap that protects the valve and safety plug from damage.
Replace the cap after each use.
Do not carry a container of Refrigerant-12 in the passen­
ger compartment of a vehicle. Never subject any container
to high temperatures. Do not breathe the smoke or fumes
produced by burning Refrigerant-12.
If Refrigerant-12 touches exposed flesh or contacts eyes
do the following:
• Treat the area as if it were frost bitten or frozen.
• Call a doctor or eye specialist and obtain treatment.
• DO NOT RUB THE EYE. Splash the area with cold
water to raise temperature above the freezing point.
Hibing
Fitting Size Torque
N*m
14-20
7 / l 6
% 41-48
41-48
%
41-48
%
1 Vi 41-48
6
Figure 10
Pipe and Hose Connections Torque
—
Front (C60) System
ozs.)
8
1.247 Kg (2 lbs. 12 ozs.)
Rear Interior (C69) System
ozs.)
8
Front (C60) System
ozs.)
(8
ozs.)
(6
ozs.)
(6
Rear Interior (C69) System
325.3 ml (11 ozs.)
GMTB-0106-1L
AIR CONDITIONING IB -9
Aluminum or
Steel Copper
TUbing
Torque
Lb. Ft.
N»m
10-15 7-8
30-36 15-18
30-36
20-27
30-36 28-37
30-36 38-44
• Use an antiseptic oil to provide a protective film over
the eyeball to reduce the possibility of infection.
HANDLING REFRIGERANT LINES
AND FITTINGS
Tighten tubing connections to the specified torque (fig­
ure 10). Insufficient or excessive torque causes loose joints
or deformed joint parts. Either condition can cause refriger­
ant leakage.
• All metal tubing lines should be free of dents or kinks
to prevent loss of system capacity due to a line
restriction.
• Never bend a flexible hose line to a radius of less than
4 times the diameter of the hose.
• Never place a flexible hose line closer than 65 mm
/ -inches) to the exhaust manifold.
(2 1 2
• Inspect flexible hose lines regularly for leaks or brittle­
ness and replace if necessary.
• When disconnecting any fitting in the refrigeration
system, discharge the system. However, proceed
with caution. Open slowly. Keep face and hands
away to prevent injury if there is liquid Refrigerant-12
in the line. Allow any pressure to bleed off as
described under "Discharging, Evacuating, Adding
Oil and Charging and Discharging the System."
• Cap or tape any line open to atmosphere to prevent
dirt and moisture from entering the system.
• Use proper wrenches when making connections on
seal (O-ring) fittings. Use two wrenches to prevent
distorting the lines or components.
• When connecting the flexible hose connections, hold
the swaged fitting, the flare nut and the coupling at
the same time using three different wrenches to pre­
vent turning the fitting and damaging the ground seat.
• Use seals (O-rings) in good condition. A burr or piece
of dirt may cause a leak.
Nominal
Torque
Wrench Span
Lb. Ft.
5-7 %
11-13
%
15-20
%
21-27
11/1 6
28-33
V A
L00206