Air Purging - Sanyo SPW-X483GH56 Installation Instruction

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 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 30 kg/cm
with dry nitrogen gas and close the cylinder valve
when the gauge reading reaches 30 kg/cm
Then, test for leaks with liquid soap.
Pressure
gauge
Narrow
tube
Pressure
gauge
2 G
2
G.
Wide tube
75 75
S4179544 S4179544
Manifold valve
Lo Hi
Charge hose
Nitrogen gas cylinder
(In vertical standing
position)
Outdoor unit
Service
valve
Wide tube
Indoor unit
Fig. 9-1
Manifold valve
Lo Hi
Nitrogen gas
cylinder
Narrow tube
Fig. 9-2
1 1 1 1 1
AS
2 2 2 2 2
S
3 3 3 3 3
X
0138_C_I
0 0 0 0 0
C
0139_C_I