Lennox T?Class TSA*S4 Units Installation Instructions Manual page 10

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.
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 Schrader 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
506663−01 11/10
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
LINE SET SIZE IS SMALLER
THAN CONNECTION
C
VAPOR LINE
LIQUID LINE SERVICE
LIQUID LINE
Figure 8. Brazing Procedures
2
CAP AND CORE REMOVAL
Remove service cap and core from both the
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.
Page 10
PORT
CORE
SUCTION / VAPOR LINE
VALVE
SERVICE VALVE
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
NITROGEN
SERVICE
PORT
CORE
SERVICE
PORT CAP