Lennox XP14-018-230 Installation Instructions Manual page 6

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
COPPER TUBE
STUB
REDUCER
REFRIGERANT LINE
3
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND 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
vapor line service port valve.
A - Connect gauge set low pressure side to
liquid line service valve (service port).
B - Connect gauge set center port to bottle of
nitrogen with regulator.
C - Remove core from valve in vapor line
service port to allow nitrogen to escape.
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 operations only in 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
SERVICE VALVE
CONNECTION
LINE SET SIZE IS SMALLER
THAN CONNECTION
C
VAPOR LINE
LIQUID LINE SERVICE
LIQUID LINE
2
CAP AND CORE REMOVAL
Remove service cap and core from
both the vapor and liquid line service
ports.
SERVICE PORT
CAP
SERVICE
PORT
CORE
LIQUID LINE SERVICE
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
LOW HIGH
ATTACH
GAUGES
B
VAPOR LINE
SERVICE
VALVE
OUTDOOR
UNIT
A
WHEN BRAZING LINE SET TO
VALVE
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
FIGURE 7
Danger of fire. Bleeding the 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.
Page 6
VAPOR LINE SERVICE
VALVE
VALVE
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
NITROGEN
WARNING
SERVICE
PORT
CORE
SERVICE
PORT CAP
XP14 SERIES