8
Do not open the service valves until the refrigerant lines and
indoor coil leak check and evacuation are complete.
WARNING:
Extreme caution should be exercised when opening the Liquid
Line Service Valve. Turn counterclock wise until the valve stem
just touches the rolled edge. No torque is required. Failure to
follow this warning will result in abrupt release of system charge
and may result in personal injury and /or property damage.
Leak check and evacuation must be completed before opening the
service valves.
8. Refrigerant line leak check
8.1 Check for leaks
Pressurize the refrigerant lines and evaporator coil to 150 PSIG using
dry nitrogen.
9. Evacuation
9.1 Evacuate the refrigerant lines and indoor coil
10. Service valves
10.1 Open the service valves
Observe the micron gauge. Evacuation is complete if the micron
gauge does not rise above 500 microns in one (1) minute.
Once evacuation is complete blank off the vacuum pump and micron
gauge, and close the valves on the manifold gauge set.
2.
Evacuate until the micron gauge reads no higher than 350 microns,
then close off the valve to the vacuum pump.
1.
1.
Check for leaks by using a soapy solution or bubbles at each brazed
location.
Remove nitrogren pressure and repair any leaks before continuing.
2.
150 PSI G
Figure 21
Figure 22
0350
Microns
ON
OFF
Figure 23
1 MIN.
Figure 24
Remove service valve cap (Figure 25).
Fully insert hex wrench into the stem and back out counterclockwise
until valve stem just touches the rolled edge
.
Replace the valve stem cap to prevent leaks. Tighten finger tight
plus an additional 1/6 turn.
1.
2.
3.
