Leak Testing - Lennox HPXA15-024 Installation Instructions Manual

Liquid Service Valve (Valve Open)
Insert Hex
Wrench Here
Field Side
Schrader
Valve
Service Port
Cap
Service Port
Liquid Service Valve (Valve Closed
Field Side
Service
Port
Service Port
Cap
Schrader Valve Open
To Line Set When Valve Is
Closed (Front Seated)
Figure 13
Vapor Line (Ball Type) Service Valve
(Valve Open)
Use Adjustable Wrench
To open: rotate stem counter-clockwise 90°.
To close: rotate stem clockwise 90°.
Schrader
valve
service
port
field side
ball
(shown open)
Figure 14
Stem Cap
Unit Side
)
Stem Cap
Insert Hex
Wrench Here
(Valve Front
Seated)
Unit Side
service port
cap unit side
stem
stem cap

Leak Testing

After the line set has been connected to the indoor and out-
door units, the line set connections and indoor unit must be
checked for leaks.
Refrigerant can be harmful if it is inhaled. Refriger-
ant must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
WARNING
Danger of explosion: Can cause
equipment damage, injury or death.
Never use oxygen to pressurize a re-
frigeration or air conditioning system.
Oxygen will explode on contact with
oil and could cause personal injury.
Danger of explosion: Can cause equipment damage,
injury or death. When using a high pressure gas
such as dry nitrogen to pressurize a refrigeration or
air conditioning system, use a regulator that can
control the pressure down to 1 or 2 psig (6.9 to 13.8
kPa).
Using an Electronic Leak Detector
1 − Connect a cylinder of R410A to the center port of the
manifold gauge set.
2 − With both manifold valves closed, open the valve on
the R410A cylinder (vapor only).
3 − Open the high pressure side of the manifold to allow
the R410A into the line set and indoor unit. Weigh in a
trace amount of R410A . [A trace amount is a maximum
of 2 ounces (57 g) or 3 pounds (31 kPa) 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 regulat-
ing valve to the center port of the manifold gauge set.
5 − Connect the manifold gauge set high pressure hose to
the vapor valve service port. (Normally, the high pres-
sure hose is connected to the liquid line port; however,
connecting it to the vapor port better protects the man-
ifold gauge set from high pressure damage.)
6 − Adjust the nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold gauge
set which will pressurize line set and indoor unit.
Page 13
WARNING
WARNING