Sanyo CHX03652 - Manual (Page 190)

5-2
Test Run and Others
1
2
3
4
5
6
7
8
Fig. 5-1
Fig. 5-2
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
refrigerant 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 liquid and gas tubes)
between the indoor and outdoor units has been
properly connected and all wiring for the test run
has been completed. Remove the valve caps from
both the gas tube and liquid tube service valves on
the outdoor unit. Note that both liquid and gas tube
service valves on the outdoor unit are kept closed at
this stage.
Leak test
(1) Attach a manifold valve (with pressure gauges)
and dry nitrogen gas cylinder to this service port
with charge hoses.
(2) Pressurize the system to no more than (36 kgf/cm 2 G)
with dry nitrogen gas and close the cylinder valve
when the gauge reading reaches (36 kgf/cm 2 G).
Then, test for leaks with liquid soap.
Manifold gauge
Outlet
Inlet
Vacuum pump
Manifold valve
Pressure
gauge
Lo Hi
Charge hose
Outdoor unit
Liquid
tube
Gas
tube
Nitrogen gas cylinder
(In vertical standing
position)
Close
Open
Close
Open
Cylinder
valve
Service port ø5/16''
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.
CAUTION
CAUTION
To avoid nitrogen entering
the refrigerant system in a
liquid state, the top of the
cylinder must be higher than
the bottom when you pres-
surize the system. Usually,
the cylinder is used in a
vertical standing position.
(Refer to the previous page.)
Fig. 5-3
1. Air Purging