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 | Page 14 |