STEP 2 −− REFRIGERANT PIPING −− Brazing Procedures

1PIPING PANEL REMOVAL / PREPARING LINE SET Remove piping panel to access 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

LINE SET SIZE MATCHES

SERVICE VALVE CONNECTION

SERVICE VALVE

CONNECTION

COPPER TUBE

STUB

REDUCER

LINE SET SIZE IS SMALLER

THAN CONNECTION

REFRIGERANT LINE

DO NOT CRIMP SERVICE VALVE

CONNECTOR WHEN PIPE IS

SMALLER THAN CONNECTION

2CAP AND CORE REMOVAL

Remove service cap and core from both the suction / vapor and liquid line service ports.

SERVICE PORT CAP

SERVICE PORT

CORE

LIQUID LINE SERVICE VALVE

SERVICE PORT

CORE

SERVICE

PORT CAP

SUCTION / VAPOR LINE

SERVICE VALVE

3ATTACH 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.

 

 

LOW

 

 

 

ATTACH

 

 

 

GAUGES

 

SUCTION / VAPOR SERVICE PORT MUST BE

 

 

 

OPEN AND SERVICE PORT CORE REMOVED

C

SUCTION /

 

TO ALLOW EXIT POINT FOR NITROGEN FLOW

 

VAPOR LINE

 

 

 

 

 

 

SERVICE

 

SUCTION / VAPOR

 

VALVE

 

LINE

 

 

 

INDOOR

 

 

 

UNIT

 

 

 

LIQUID LINE

LIQUID LINE SERVICE

A

 

 

VALVE

HIGH

B

OUTDOOR

UNIT

NITROGEN

FIGURE 7

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Lennox International Inc XC21 installation instructions Refrigerant Piping −− Brazing Procedures, CAP and Core Removal

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