GMC 1982 Light Duty Truck Service Manual page 52

'HPV" - H IG H PRESSURE VAPOR LE A V IN G COMPRESSOR.
*HPL" - VAPOR IS COOLED DOWN BY CONDENSER A IR FLOW A N D LEAVES AS HIGH PRESSURE LIQ U ID .
'L P L " - O R IF IC E M ETERS THE LIQ U ID R-12, IN TO EVAPO RATO R, REDUCING ITS PRESSURE, AND
W ARM BLOWER A IR ACROSS EVAPO RATO R CORE CAUSES B O ILIN G OFF OF LIQ U ID IN TO VAPOR.
'L P V " - LEAVES EVAPORATOR AS LOW PRESSURE VAPOR AND RETURNS W ITH THE
SM ALL A M O U N T OF . . .
'Ipl" - . . . LOW PRESSURE L IQ U ID T H A T D ID N 'T BOIL OFF COM PLETELY BACK TO
THE COMPRESSOR TO BE COMPRESSED A G A IN .
eyes. Any liquid R e f r ig e r a n t- 12
accidentally escape is a pproxim ately 21°F (-6°C)
below zero. If liquid R efrigerant-12 should touch the
eyes, serious damage could result. Always wear goggles
to protect the eyes when
connections. If R efrig erant-12 liquid should strike the
eye:
a. Call a doctor or eye specialist im m ediately and
obtain treatm ent as soon as possible.
b. DO N O T RUB T H E EYE. Splash the affected area
with quantities of cold water to gradually get the
tem perature above the freezing point.
REFRIG ERANT — 12
PRESSURE — TEM PER A TU R E
RELA TIO NSHIP
The table below indicates the pressure of Refri­
gerant — 12 at various tem peratures. For in­
stance, a drum of Refrigerant at a tem perature
of 8 0 ' F (2 6 .8 'C) will have a pressure of 84.1 PSI
(5 7 9 .9 kPa). If it is heated to 125>F (51.6°C), the
pressure will increase to 1 6 7 .5 PSI (1 1 5 4 .9
kPa). It also can be used conversely to deter­
mine the tem perature at which Refrigerant —
12 boils under various pressures. For example,
at a pressure of 30.1 PSI (2 0 7 .5 kPa), Refriger­
ant — 12 boils at 32"F (OC).
P R ESSU R E C Y C L IN G SY STEM
Fig. 1B-13--CCOT System Components
which may
opening refrigeran t
metal screw cap. The purpose of the cap is to protect the
valve
C)
f F)(
- 2 1 . 7 - 29.8C 0(A TM 0S P H E R IC O(kPa)
- 2 0 - 28.8C
- 1 0 - 23.3C
- 5 - 20.5C
0 - 1 7.7C
5 - 1 5.0C
10 - 12.2C
15 - 9.4C
20 - 6.6C
25 - 3.8C
30 -
1.1C
32 OC
35 1.6C
40
4.4C
45 7.2C
50
10. OC
c. The use of an antiseptic oil is helpful in providing a
protective film over the eyeball to reduce the
possibility of infection. Should liquid R efrigerant-12
come into contact with the skin, the injury should be
treated the same as skin which has been frostbitten
or frozen.
All R efrigerant-12 drums are shipped with a heavy
(PSIGXkPa) f F)(°C)
55 12.7C
PRESSURE) 60 15.5C
2.4 16.5 65 18.3C
4 .5 31.0 70 21.1C
6 .8 4 6 .9 75 23.8C
9.2 6 3 .4 80 2 6 .6C
8 1 .4
11.8 85 29.4C
101.4 90 3 2 .2C
14.7
17.7 1 22.0 95 3 5 .0C
21.1 145.5 100 37.7C
24.6 169.6 105 40.5C
28.5 196.5 110 43.3C
30.1 115 46.1C
2 0 7 .5
32.6 2 2 4 .8 120 48.8C
3 7 .0 255.1 125 51.6C
41.7 2 8 7 .5 130 54.4C
46.7 3 2 2 .0 140 6 0 .0C
AIR CONDITIONING IB-9
(PSIGHkPa)
52.0 3 5 8 .5
57.7 3 9 7 .8
63.7 4 3 9 .2
70.1 4 82 .7
5 30.2
76.9
84.1
5 79 .9
91.7 6 32 .3
9 9 .6 6 86 .7
108.1 745.3
8 0 6 .0
116.9
126.2 870.2
136.0 9 37.7
1010.1
146.5
157.1 1083.2
167.5 1154.9
179.0 1234.2
204 .5 1410.0