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STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures
1
CUT AND DEBUR
Cut ends of the refrigerant lines square (free from nicks or dents)
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
CUT AND DEBUR
SERVICE VALVE
CONNECTION
COPPER TUBE
STUB
REDUCER
REFRIGERANT LINE
3
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE VALVES
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 suction /
vapor line service port valve.
1.
Connect gauge set low pressure side to
liquid line service valve (service port).
2.
Connect gauge set center port to bottle of
nitrogen with regulator.
3.
Remove core from valve in suction / vapor
line service port to allow nitrogen to escape.
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
INDOOR
UNIT
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations.
Perform
well-ventilated areas.
Wear gloves and protective goggles or face shield
to protect against burns.
Wash hands with soap and water after handling
brazing alloys and flux.
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
LINE SET SIZE IS SMALLER
THAN CONNECTION
C
VAPOR LINE
LIQUID LINE SERVICE
LIQUID LINE
operations
only
2
CAP AND CORE REMOVAL
Remove service cap and core from
both the suction / vapor and liquid line
service ports.
SERVICE PORT
CAP
SERVICE
LIQUID LINE SERVICE
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
LOW
HIGH
ATTACH
GAUGES
B
SUCTION /
VAPOR LINE
SERVICE
VALVE
OUTDOOR
UNIT
A
WHEN BRAZING LINE SET TO
VALVE
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
FIGURE 7
in
Page 6
PORT
CORE
SUCTION / VAPOR LINE
VALVE
SERVICE VALVE
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
NITROGEN
WARNING
Danger
of
fire.
refrigerant charge from only the high
side may result in pressurization of
the low side shell and suction tubing.
Application of a brazing torch to a
pressurized system may result in
ignition of the refrigerant and oil
mixture. Check the high and low
pressures before applying heat.
SERVICE
PORT
CORE
SERVICE
PORT CAP
Bleeding
the
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