S1CG/S1HG
Single-Zone,
S2CG/S2HG
Dual-Zone
• Installation, Operation and Maintenance Manual •
Comfort where it counts
14
P/N 240007754, Rev. C [3/19/2010]
Refrigerant Processing
(continued)
WARNING
It is illegal to discharge refrigerant into
the atmosphere. Use proper reclaiming
methods & equipment when installing
or servicing this unit.
The units are delivered pre-charged with
refrigerant for the condenser coil and the air
handler. Charging of the fi eld installed piping
is required. Refer to the refrigerant charge
table for the proper amount to be added for
the applications interconnect piping. Unit
service valves are solid brass, for sweat con-
nections.
CAUTION
Pressure test
all fi eld installed piping
with nitrogen. Using a suitable vacuum
pump, evacuate the tubing and indoor
unit to 500 microns or less, with service
valves remaining front seated (closed).
Before releasing the refrigerant from the
condenser, be sure the manifold gauge
set is closed so as not to lose vacuum
when shutt ing down the pump.
Release refrigerant from the condensing
unit by back seating the service valve. Al-
len wrenches are used to open the valve.
Replace valve caps. DO NOT back seat
the valves past the snap fl anges that hold
the valve core in place.
NOTICE
Th
e following air handlers are equivalent
in electrical specifi cations and system
combinations.
WLH09
=
UNH09
WLH12
=
UNH12
WLH24
=
UNH24
WLC30
=
UNC30
WLC36
=
UNC36
