Air Purging - Sanyo COOL Installation Instructions Manual
Split system air conditioner
Hide thumbs
Also See for COOL:
- Installation instructions manual (27 pages) ,
- Installation instructions manual (36 pages)
Table of Contents
9. Air Purging
Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below. Therefore,
they must be purged completely.
pressure in the system rises
operating current rises
cooling (or heating) efficiency drops
moisture in the air may freeze and block capillary tub-
ing
water may lead to corrosion of parts in the refrigerant
system
Air Purging with a Vacuum Pump (for Test Run)
Check that each tube (both narrow and wide tubes)
between the indoor and outdoor units have been proper-
ly 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". 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
CAUTION
purging. If it is not available,
use a stop valve for this pur-
pose. 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
Charge hose
Nitrogen gas cylinder
(In vertical standing
position)
Outdoor unit
Service
valve
Narrow
Wide tube
tube
Indoor unit
Fig. 46
Manifold valve
Pressure
Lo
Hi
gauge
Cap
Nitrogen gas
cylinder
Narrow tube
Wide tube
Fig. 47
Page 22
Table of Contents
