Lennox Collection XC21 System Installation Instructions Manual page 13

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 / VAPOR 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 / vapor line
service port, nitrogen flow will have an exit point.
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN AND SERVICE PORT CORE REMOVED
TO ALLOW EXIT POINT FOR NITROGEN FLOW
SUCTION / VAPOR
INDOOR
UNIT
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
LINE SET SIZE IS SMALLER
THAN CONNECTION
C
LINE
LIQUID LINE SERVICE
LIQUID LINE
Figure 8. Brazing Procedures
2
CAP AND CORE REMOVAL
Remove service cap and core from both the suction / vapor and
liquid line service ports.
SUCTION / VAPOR LINE
SERVICE VALVE
LOW HIGH
ATTACH
GAUGES
B
SUCTION /
VAPOR LINE
SERVICE
VALVE
OUTDOOR
UNIT
A
VALVE
Page 13
SERVICE PORT CAP
SERVICE PORT
CORE
LIQUID LINE SERVICE VALVE
SERVICE PORT
CORE
SERVICE
PORT CAP
NITROGEN
XC21 SERIES