Lennox International Inc 506945-01 REFRIGERANT PIPING --Brazing Procedures, 1CUT AND DEBUR

STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures

1CUT 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.

2CAP AND CORE REMOVAL Remove service cap and core from both the suction / vapor and liquid line service ports.

CUT AND DEBUR

LINE SET SIZE MATCHES

SERVICE VALVE CONNECTION

SERVICE PORT	SERVICE
CAP	PORT
	CORE

SERVICE VALVE

CONNECTION

COPPER TUBE

STUB

REDUCER

LINE SET SIZE IS SMALLER

THAN CONNECTION

REFRIGERANT LINE

SERVICE
PORT
CORE	SERVICE
	PORT CAP
ANGLE-TYPE SERVICE	BALL-TYPE SERVICE
VALVE	VALVE

DO NOT CRIMP SERVICE VALVE

CONNECTOR WHEN PIPE IS

SMALLER THAN CONNECTION

3ATTACH 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.

AConnect gauge set low pressure side to liquid line service valve (service port).

BConnect gauge set center port to bottle of nitrogen with regulator.

CRemove core from valve in suction / vapor line service port to allow nitrogen to escape.

SUCTION / VAPOR SERVICE PORT MUST BE	C
OPEN TO ALLOW EXIT POINT FOR NITROGEN

VAPOR LINE

INDOOR

UNIT

LOW

ATTACH

GAUGES

SUCTION /

VAPOR LINE

SERVICE

VALVE

HIGH

B

OUTDOOR

UNIT

USE REGULATOR TO FLOW NITROGEN AT 1 TO 2 PSIG.

NITROGEN

LIQUID LINE	LIQUID LINE SERVICE	A WHEN BRAZING LINE SET TO
	VALVE	SERVICE VALVES, POINT FLAME
		AWAY FROM SERVICE VALVE.

FIGURE 8

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.

WARNING

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.

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