Allied Air 4SCU14LE SERIES Installation And Maintenance Instructions Manual - Page 10
Browse online or download pdf Installation And Maintenance Instructions Manual for Air Conditioner Allied Air 4SCU14LE SERIES. Allied Air 4SCU14LE SERIES 20 pages.
Print PageThe ball valve is equipped with a service port with a factory-
installed Schrader valve. A service port cap protects the
Schrader valve from contamination and serves as the primary
seal.
Leak Testing
After the line set has been connected to the indoor and
outdoor units, the line set connections and indoor unit must
be checked for leaks.
Using an Electronic Leak Detector
1. Connect the high pressure hose of the manifold gauge
set to the suction valve service port. (Normally the high
pressure hose is connected to the liquid line port;
however, connecting it to the suction ports helps to
protect the manifold gauge set from damage caused by
high pressure.)
Ball Type Service Valve
(Valve Open)
Use adjustable wrench. To open, rotate stem counterclock-
wise 1/4 turn (90°). To close, rotate stem clockwise 1/4 turn
(90°).
Figure 11
Page 10 of 20
2. With both manifold valves closed, connect the cylinder
of R410A refrigerant. Open the valve on the R410A
cylinder (vapor only).
Fire, Explosion, and Personal Safety Hazard.
Failure to follow this warning could result in damage,
personal injury, or death.
Never use oxygen to pressurize or purge refrigeration
lines. Oxygen, when exposed to a spark or open flame,
can cause damage by fire and/or an explosion, that could
result in personal injury or death.
3. Open the high pressure side of the manifold to allow
R410A into the line set and indoor unit. Weigh in a trace
amount of R410A. (A trace amount is a maximum of 2
oz. of refrigerant or 3 lbs. pressure.) Close the valve on
the R410A cylinder and the valve on the high pressure
side of the manifold gauge set. Disconnect the R410A
cylinder.
4. Connect a cylinder of nitrogen with a pressure regulating
valve to the center port of the manifold gauge set. When
using high pressure gas such as nitrogen for this
purpose, be sure to use a regulator that can control
the pressure down to 1 or 2 psig.
5. Adjust nitrogen pressure to 150 psig. Open the valve on
the high side of the manifold gauge set to pressurize
the line set and the indoor coil.
6. After a short period of time, open a refrigerant port to
make sure that an adequate amount of refrigerant has
been added for detection (refrigerant requirements will
vary with lengths). Check all joints for leaks. Purge
nitrogen and R410A mixture. Correct any leaks and
recheck.
Issue 1015
WARNING
506251-01