4

5

WRAP SERVICE VALVES

To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use additional water saturated cloths underneath the valve body to protect the base paint.

FLOW NITROGEN

Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections

6BRAZE LINE SET

Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water saturated cloths must remain water saturated throughout the brazing and cool−down process.

 

 

SUCTION / VAPOR LINE

 

 

SERVICE VALVE

LIQUID LINE SERVICE VALVE

 

VAPOR LINE SERVICE VALVE

 

 

 

ANGLE−TYPE SERVICE

COULD BE EITHER A ANGLE−TYPE

 

OR BALL−TYPE VALVE.

 

VALVE

 

 

WHEN BRAZING

 

 

LINE SET TO

 

 

SERVICE VALVES,

 

 

POINT FLAME

 

 

AWAY FROM

 

 

SERVICE VALVE.

 

 

 

WATER SATURATED

 

 

CLOTH

 

LIQUID LINE

 

SUCTION / VAPOR LINE

 

 

 

WATER SATURATED

 

 

CLOTH

WHEN BRAZING LINE SET TO SERVICE VALVES, POINT FLAME AWAY

 

FROM SERVICE VALVE.

 

 

PREPARATION FOR NEXT STEP

 

 

7 After all connections have been brazed, disconnect

manifold gauge set from service ports. Apply additional water saturated cloths to both

service valves to cool piping. Once piping is cool, remove all water saturated cloths.

Figure 10. Brazing Procedures (continued)

IMPORTANT

Allow braze joint to cool. Apply additional water saturated cloths to help cool brazed joint. Do not remove water saturated cloths until piping has cooled. Temperatures above 250ºF will damage valve seals.

WARNING

FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE may result if you do not wrap a water satu- rated cloth around both liquid and suction line service valve bodies and copper tube stub while brazing in the line set! The braze, when complete, must be quenched with water to absorb any residual heat.

Do not open service valves until refrigerant lines and indoor coil have been leak−tested and evacuated. Refer to procedures provided in this supplement.

506728−01

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Lenox 50677201 installation instructions Wrap Service Valves, Flow Nitrogen, 6BRAZE Line SET, Preparation for Next Step