Delta 21UT024C24 Instruction Manual page 17

(2) Remove service cap and core from both the gas and liquid line service ports.
Service port core
Service port cap
(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
INDOOR
UNIT
Gas line
(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.
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.
Liquid line
service valve
Fig.14
Use regulator to flow
nitrogen at 1 to 2 psig
Gas service port must be open
to allow exit point for nitrogen
Fig.15
When brazing line set to
service valves, point flame
away from service valve.
Fig.16
13
Floor Ceiling Air-Conditioning Unit
Service port core
Service port cap
Gas line
service valve
Liquid line service valve
OUTDOOR
UNIT
Gas line service valve
Water saturated
cloth