Lennox Signature Collection XP15 Installation Instructions Manual page 12

WARNING I OUTOOORO.,T
SERVICE VALVE
1 Connect an HFC410A manifold gauge set high
pressure hose to the vapor valve service port
(Normally the high pressure hose is connected to the
liquid line port; however, connecting it to the vapor port
better protects the manifold gauge set from high
pressure damage.)
2 With both manifold valves closed connect the cylinder
of HFC410A refrigerant to the center port of the
manifold gauge set Open the valve on the HFC 410A
cylinder (vapor only)
3 Open the high pressure side of the manifold to allow
HFC 410A into the line set and indoor unit
4 Weigh in a trace amount of HFC410A [,4 trace
amount is a maximum of two ounces (57 g) refrigerant
or three pounds (31 kPa) pressure].
5, Close the valve on the HFC-410A cylinder and the
valve on the high pressure side of the manifold gauge
set.
6. Disconnect the HFC-410A cylinder,
7, Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set,
8, Adjust dry nitrogen pressure to 150 psig (1034 kPa),
9, Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit,
10, After a few minutes, open one of the service valve
ports and verify that the refrigerant added to the
system earlier is measurable with a leak detector,
11, After leak testing disconnect gauges from service
ports,
REMOVE SERVICE
PORT CAP
REMOVE PORT CORE
Figure 21. Typical Service Valve Port Core Removal
A IMPORTANT
A IMPORTANT
A CAUTION
A IMPORTANT
Remove both of the outdoor unit's service port cores (liquid
and vapor) as illustrated in figure 21,
If new lines are used then proceed to Installing New
Refrigerant Metering Device. Otherwise proceed with the
following procedure,
505328M 04/08
Page 12