Floor Ceiling Air-Conditioning Unit
13
(2) Remove service cap and core from both the
gas
and liquid line service ports.
Service port core
Service port cap
Liquid line
service valve
Gas
line
service valve
Service port core
Service port cap
Fig.14
(3) Flow regulated nitrogen (at 1 to 2 psig) through the low−side refrigeration gauge set into the
liquid line service port valve, and out of the
gas
line service port valve.
Liquid line
Use regulator to flow
nitrogen at 1 to 2 psig
Liquid line service valve
Gas
line service valve
Gas
service port must be open
to allow exit point for nitrogen
Gas
line
OUTDOOR
UNIT
INDOOR
UNIT
Fig.15
(4) To help protect service valve seals during brazing, wrap water saturated cloths around
service valve bodies and copper tube stubs. Water saturated cloths must remain water
saturated throughout the brazing and cool−down process.
Braze line to the service valve.
When brazing line set to
service valves, point flame
away from service valve.
Water saturated
cloth
Fig.16
After all connections have been brazed, disconnect manifold gauge set from service ports.
Apply water saturated cloths to both services valves to cool piping. Once piping is cool, remove all
water saturated cloths. Reinstall service cap and core. Refer to the unit installation instructions for
the next step in preparing the unit.
