Leak Test, Evacuation And Additional Refrigerant Charge; Air Purging With A Vacuum Pump (For Test Run) Preparation; Leak Test - Sanyo SPWXDR124GH56A Manual Del Usuario

8. LEAK TEST, EVACUATION AND
ADDITIONAL REFRIGERANT CHARGE
●
Perform an air-tightness test for this package A/C.
Check that there is no leakage from any of the con-
nections.
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 evac-
uated 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 prop-
erly connected and all wiring for the test run has been
completed. Remove the valve caps from both the gas
and liquid 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.
●
The refrigerant charge at the time of shipment is
only guaranteed sufficient for a tubing length of up
to 30 m. The tubing may exceed this length, up to
the maximum permitted length; however, an addi-
tional charge is necessary for the amount that the
tubing exceeds 30 m. (No additional refrigerating
machine oil is needed.)

8-1. Leak Test

(1) With the service valves on the outdoor unit closed,
remove the 1/4 in. flare nut and its bonnet on the
gas 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.
CAUTION
DC̲Inverter̲Eng.indd 59 DC̲Inverter̲Eng.indd 59
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 gauge
Fig. 8-1
Vacuum pump
Fig. 8-2
Manifold valve
Pressure
Lo Hi
gauge
Cylinder
valve
Open
Gas
tube
Liquid
tube
Fig. 8-3
59
GB
FR
Outlet
Inlet
DE
PT
GR
Charge hose
ES
Nitrogen gas cylinder
(In vertical standing
position)
Close
Outdoor unit
Close
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IT