Air Purging - Sanyo CH2442 Installation Instructions Manual

11. AIR PURGING

Air and moisture in the refrigerant system may have
undesirable effects as indicated below.
pressure in the system rises
operating current rises
cooling (or heating) efficiency drops
moisture in the refrigerant circuit may freeze and
block capillary tubing
water may lead to corrosion of parts in the refriger-
ant system
Therefore, the indoor unit and the tubing between the
indoor and outdoor units must be checked for leaks and
evacuated to remove air and moisture.
Air Purging with a Vacuum Pump (for Test Run)
Preparation
5 5 5 5 5
Check that each tube (both narrow and wide) between
C
the indoor and outdoor units has been properly con-
nected and all wiring for the test run has been com-
pleted. Remove the valve caps from both the wide and
narrow service valves on the outdoor unit. Note that
both narrow and wide tube service valves on the
outdoor unit are kept closed at this stage.
Leak test
(1) With the service valves on the outdoor unit
closed, remove the 1/4 in. flare nut and its bonnet
on the wide tube service valve. (Save the flare
nut and its bonnet for reuse.)
(2) Attach the nitrogen gas cylinder to the service
port of the wide tube via a manifold valve with
pressure gauges. (See Fig. 11-2)
CAUTION
(3) Pressurize the system to about 150 P.S.I.G. with
dry nitrogen gas and close the cylinder valve when
the gauge reading reaches about 150 P.S.I.G.
Then, test for leaks with liquid soap.
Use a manifold valve for air
purging. If It is not available,
use a stop valve for this
purpose. The "Hi" knob of
the manifold valve must
always be kept closed.
Manifold valve
Pressure
Lo
gauge
Outdoor unit
*
Narrow
tube
Indoor unit
3-way valve is used for 3642 type.
*
Fig. 11-1
Manifold valve
Pressure
Lo
gauge
Cap
Narrow tube
Wide tube
Fig. 11-2
82
S4359146
Hi
Charge hose
Nitrogen gas cylinder
(In vertical standing
position)
Service
valve
Wide tube
2090_C_I
Hi
Nitrogen gas
cylinder
1370_C_I