Lennox XC21 Series Unit Information page 15

1
PIPING PANEL REMOVAL AND PREPARING LINE
SET
Remove piping panel for easier access to service valves. 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
DO NOT CRIMP SERVICE
VALVE CONNECTOR WHEN
PIPE IS SMALLER THAN
CONNECTION
3
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING
LIQUID AND SUCTION LINE SERVICE VALVES
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 With valve core removed from the suction line service
port, nitrogen flow will have an exit point.
SUCTION SERVICE PORT MUST BE OPEN AND
SERVICE PORT CORE REMOVED TO ALLOW
EXIT POINT FOR NITROGEN FLOW
INDOOR
UNIT
LIQUID LINE
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
LINE SET SIZE IS SMALLER
THAN CONNECTION
GAUGES
C
SUCTION LINE
SERVICE VALVE
SUCTION LINE
LIQUID LINE SERVICE
VALVE
Figure 8. Brazing Procedures
Page 15
2
CAP AND CORE REMOVAL
Remove service cap and core from both the suction and liquid line
service ports.
SUCTION LINE SERVICE
VALVE
LOW HIGH
ATTACH
B
OUTDOOR
UNIT
A
SERVICE PORT CAP
SERVICE PORT
CORE
LIQUID LINE SERVICE VALVE
SERVICE PORT
CORE
SERVICE
PORT CAP
NITROGEN
XC21