SA SPW-C0705DZH8 Instrucciones De Instalación página 37

■ Air Purging with a Vacuum Pump (for Test Run)
Preparation
Check that each tube 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 all service ports
on the outdoor unit (Fig. 6-2). Note that all service valves on
the outdoor unit are kept closed at this stage (Fig. 6-3).
The balance tube leak test is not necessary if only 1 outdoor
unit is installed.
Flare nut
Manifold valve
Pressure
gauge Lo Hi
Cylinder
valve
Open
Suction tube
Open
Discharge tube
Open
Liquid tube
Open
Balance tube
Valve cap
Service port cap
Charge hose
Nitrogen gas cylinder
(In vertical standing
position)
Close
Close
Outdoor unit
Close
Close
Leak test
(1) Attach a manifold valve (with pressure gauges) and dry
nitrogen gas cylinder to all service ports with charge hoses.
The balance tube leak test is not necessary if only 1
outdoor unit is installed.
CAUTION
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.
(2) Pressurize the system to no more than 33 kgf/cm
nitrogen gas and close the cylinder valve when the gauge
reading reaches 33 kgf/cm
soap.
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 pressurize the system. Usually, the
Fig. 6-2
cylinder is used in a vertical standing position.
(3) Do a leak test of all joints of the tubing (both indoor and
outdoor) and all service valves. Bubbles indicate a leak.
Wipe off the soap with a clean cloth after the leak test.
(4) After the system is found to be free of leaks, relieve the
nitrogen pressure by loosening the charge hose connector
at the nitrogen cylinder. When the system pressure is
reduced to normal, disconnect the hose from the cylinder.
Fig. 6-3
35
2
G with dry
2 G. Then, test for leaks with liquid