Lennox Merit 13HPX Series Installation Instructions Manual page 13

4
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.
5
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
6
BRAZE 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.
WHEN BRAZING
LINE SET TO
SERVICE VALVES,
POINT FLAME
AWAY FROM
SERVICE VALVE.
WHEN BRAZING LINE SET TO SERVICE VALVES, POINT FLAME AWAY
7
PREPARATION FOR NEXT STEP
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.
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.
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LIQUID LINE SERVICE VALVE
LIQUID LINE
SUCTION / VAPOR LINE
FROM SERVICE VALVE.
Figure 9. Brazing Procedures (continued)
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.
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SUCTION / VAPOR LINE
SERVICE VALVE
ANGLE−TYPE SERVICE
VALVE
WATER SATURATED
CLOTH
IMPORTANT
WARNING
Page 13
VAPOR LINE SERVICE VALVE
COULD BE EITHER A ANGLE−TYPE
OR BALL−TYPE VALVE.
WATER SATURATED
CLOTH
13HPX SERIES