Air Purging; Air Purging With A Vacuum Pump (For Test Run) - Sanyo C2432A Installation Instructions Manual

9.

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 tubing between the
indoor and outdoor unit must be leak tested and
evacuated to remove any noncondensables and
moisture from the system.

Air Purging with a Vacuum Pump (for Test Run)

Preparation
Check that each tube (both narrow and wide) between
the indoor and outdoor units have been properly
connected and all wiring for the test run has been
completed. 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 them for reuse.)
(2) Attach a manifold valve (with pressure gauges)
and dry nitrogen gas cylinder to this service port
with charge hoses.
Use a manifold valve for air
purging. If It is not available,
use a stop valve for this
CAUTION purpose. The "Hi" knob of
the manifold valve must
always be kept closed.
(3) Pressurize the system to no more than 150
P.S.I.G. with dry nitrogen gas and close the
cylinder valve when the gauge reading reaches
150 P.S.I.G. Then, test for leaks with liquid soap.
Manifold valve
Pressure
Lo Hi
gauge
Outdoor unit
Service
valve
*
Narrow
tube
Indoor unit
3-way valve is used for 3632 type.
*
Fig. 9-1
Manifold valve
Pressure
Lo
gauge
Cap
Narrow tube
Wide tube
Fig. 9-2
44
S4179694
Charge hose
Nitrogen gas cylinder
(In vertical standing
position)
Wide tube
1369_C_I
Hi
Nitrogen gas
cylinder
1370_C_I