Subaru XT 1988 Service Manual page 1037

AIR CONDITIONING SYSTEM
4-7
2)
Attach center charging hose of manifold gauge to refriger-
ant can through can tap. Break seal of refrigerant can to allow
refrigerant to enter manifold gauge. Loosen charging hose at
the center fitting of manifold gauge and purge air from inside
charging hose. Refer to "Handling Can Tap".
3) Open high- and low-pressure valves of manifold gauge and
charge refrigerant into system.
t t
L4494
Fig. 15
a. When refrigerant charging speed is slow, immerse refriger-
ant can in water heated to a temperature of about 40° C
(104°F). However, note that this is dangerous when water is
hot.
Fig. 16
CAUTION:
Immerse in water
heated to about
40°C 1104°FI.
~zz:zzzz:z:zzz:z:z:z::r:z:P Note th a t hot
, water is
dangerous.
A26-o36
a. Under any circumstances the refrigerant can must not
be warmed in water heated to a temperature of over 52°C
(126°F).
b. A blow torch or stove must never be used to warm up
the can.
c. When charging liquefied refrigerant into the system with
the can turned upside down to reduce charging time, charge
it only through high pressure valve, but not through low·
pressu re valve.
After completion of charging, the compressor should always
•
L4495
Fig. 17
4) If refrigerant charging speed slows down, charge it while
running the compressor for ease of charging. After having
taken the steps up to 3) above, proceed with charging in the
following order.
(1) Shut off high pressure valve of manifold gauge.
CAUTION:
Never charge refrigerant through high pressure side of system
since this will force refrigerant back into refrigerant can and
can may explode.
(2) Run the engine at idling speed.
(3) Set temperature control lever and fan switch at
maximum cool and maximum speed respectively.
(4) Charge refrigerant while controlling low-pressure
gauge reading at 275 kPa (2.8 kg/cm2, 40 psi) or less by
turning in or out low-pressure valve of manifold gauge.
Repeat from 3) when difference of pressure between low and
high pressure gauges does not appear after one minute opera-
tion. It is not possible to charge refrigerant without pressure
difference between low- and high-pressure gauges.
L4496
be turned several times manually.
Fig. 18
15