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UL Listed and FM Approved
Manufactured by: General Air Products, Inc.
118 Summit Drive, Exton, PA 19341
Installation
(continued)
Model AMD-1 (Pressure Regulator)
Caution: Care must be taken NOT to overpressure
the system above the regulator setting when using
the quick fill line.
Note: If necessary to adjust the system pressure ensure
the pressure gauge is installed in the regulator port. Move
the locking nut away from the body of the regulator and
turn the adjustment screw IN to increase the system
pressure and OUT to reduce system pressure
(see Fig. 1).
When reducing from a higher to a lower setting, first
reduce to some pressure less than desired, then bring up
to the desired point.
After achieving the desired pressure setting, lock the
pressure setting by tightening the locking nut.
Step 4. Close the bypass valve (#7) and open the two
1/4" ball valves (#8). The Air Maintenance Device is now
in service.
Model AMD-2 (Pressure Switch) (see Fig. 2)
Step 1. An electrical power circuit should be installed
using the pressure switch to control the compressor
motor in accordance with the National Electric Code
and/or the requirements of the local Authority Having
Jurisdiction.
Consult
recommendations.
Step 2. Close the 1/4" ball valves (#18) and open the
bypass valve (#17) in the Air Maintenance Device and
open the air supply valve in the dry pipe valve trim.
Step 3. Energize the branch circuit to the pressure switch
to start the compressor and pressurize the system.
Step 4. When the system is pressurized, the pressure
switch will cut-out and stop the compressor. Note the
cut-out pressure.
factory
for
specific
Step 5. Open any valve connected to the piping system
(such as the three-way valve for the air gauge on the dry
pipe valve trim) just enough to slowly reduce the air
pressure. Close it immediately when the pressure switch
cuts-in and note the cut-in pressure. Verify the the cut-in
and cut out pressures meet the minimum design
requirements for the system air pressures.
Note: If necessary, adjust the cut-in or the cut-out
pressure. Loosen the hex-nut on the cover of the
pressure switch and remove the cover. Adjust the cut-in
pressure by turning the Pressure Adjustment Screw in the
proper direction. Adjust the pressure differential
(difference between cut-in and cut-out pressure) by
turning the Pressure Differential Screw. Consult Factory if
in any doubt.
Step 6. Close the bypass valve (#17) and open the two
1/4" ball valves (#18). The Air Maintenance Device is now
in service.
Care and Maintenance
The Air Maintenance Device does not require any
regularly scheduled maintenance. However, it is
recommended that proper operation and condition be
periodically verified as follows:
1. Verify that the 3/4" bypass valve is closed, the two 1/4"
ball valves are open and the air supply control valve in
the dry pipe valve trim is open.
2. Verify that the cut-in and cut-out pressures are at the
proper setting, if applicable.
3. Verify that the regulated pressure is at the proper
setting, if applicable.
4. Accumulated moisture should be removed from the
drip leg on the air supply line and the desiccant in the air
dryer should be replaced, if applicable.
5. The strainer should be cleaned.
AMDMSTR.3
01/16/13
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