|nsta||er's Guide
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LiQUiD LiNE SERVICE VALVE
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LIQUID LINE
CONNECTION
E. SERVICE VALVE OPERATION
BRASS LIQUID LINE SERVICE VALVE
The Brass Liquid Line Service Valve is thetory shipped in the
seated position to hold thctory charge. The pressure tap
service port (when depressed) opens only to the field brazing
side of the valve when the valve is in the seated position.
The liquid line valve is not a back seating valve (see
WARNING below).
LEAK CHECK
iMPORTANT:
Replace pressure tap port valve core before attaching hoses
for evacuation.
After the brazing operation of refrigerant lines to both the
outdoor and indoor unit is completed, the field brazed
connections must be checked for leaks. Pressurize through
the service valve ports, the indoor unit and field refrigerant
lines with dry nitrogen to 350-400 psi. Use soap bubbles or
other leak-checking methods to see that all field joints are
leak-fi'ee! If not, release pressure; then repair!
SYSTEM EVACUATION
NOTE:
Since the outdoor unit has a refrigerant charge, the gas and
liquid line valves must remain closed.
1. Upon completion of leak check, evacuate the refrigerant
lines and indoor coil before opening the gas and liquid
line valves.
2. Attach appropriate hoses from manifold gauge to gas
and liquid line pressure taps.
Extreme caution should be exercised when opening the
Liquid Line Service Valve. Turn valve stem counterclock-
wise only until the stem contacts the rolled edge. (See
Figure 4) No torque is required.
BRASS GAS LINE SERVICE VALVE
The Brass Gas Line Service Valve is shipped in the closed
position to hold the rectory refrigerant charge. The pressure
tap service port (when depressed) opens only to the field
brazing side when the valve is in the closed position. The Gas
Line Service Valve is full open with a 1/4 turn. See Figure 5.
BRAZING REFRIGERANT LINES
1. Remove lower access cover to access service valves.
2. Before brazing, remove plugs from external copper stub
tubes. Clean internal and external surIhces of stub
tubes prior to brazing.
3. Cut and fit tubing, minimizing the use of sharp
90 ° bends.
4. Insulate the entire gas line and its fittings.
5. Do NOT allow uninsulated liquid line to come in direct
contact with bare gas line.
6. Precautions should be taken to avoid heat damage
to the pressure tap valve core during brazing. It is
recommended that the pressure tap port valve
core be removed and a wet rag wrapped around
the valve body.
NOTICE:
Use care to make sure that no moisture enters pressure tap
port, while wet rag is being used.
NOTICE:
Precautions should be taken to avoid heat damage to
basepan during brazing. It is recommended to keep the
flame directly off of the baeepan.
7. Use a Dry Nitrogen Puige and Brazing Alloy without flux
when brazing the field line to the copper thctory connec-
tion. Flow dry nitrogen into either valve pressure tap
port, thru the tubing and out the other port while brazing.
8. Braze using accepted good brazing techniques.
NOTE:
Unnecessary switching of hoses can be avoided and
complete evacuation of all lines leading to sealed system
can be accomplished with manifold center hose and
connecting branch hose to a cylinder of R-410A and
vacuum pump.
3. Attach center hose of manifold gauges to vacuum pump.
4. Evacuate until the micron gauge reads no higher than
350 microns.
5. Close offvalve to vacuum pump and observe the micron
gauge. If gauge pressure rises above 500 microns in one (1)
minute, then evacuation is incomplete or system has a leak.
6. If vacuum gauge does not rise above 500 microns in
one (1) minute, the evacuation should be complete.
7. With vacuum pump and micron gauge blanked off, open
valve on R-410A cylinder and charge refrigerant lines and
indoor coil with vapor to tank pressure of R-410A supply.
NOTE:
DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE.
8. Close valve on R-410A supply cylinder. Close valves on
manifold gauge set and remove refioigerant charging
hoses from liquid and gas pressure tap ports.
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GAS LiNE SERVICE VALVE
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FOR FULL OPEN
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oP VALVE
PRESSURE TAP PORT /#
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GAS LINE CONNECTION
18-AC51 D6-1
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