TFP1241
Page 3 of 4
Operating
Procedure
Place the TYCO Model AMD-3 Auto-
matic Nitrogen Maintenance Device
in operation in accordance with this
section.
Step 1.
Determine the pressure that
meets the minimum requirements of
the system to pressurize.
Step 2.
Close the control valve in the
air supply trim to the system.
Step 3.
Turn the Two-Stage Pressure
Regulator adjusting handle counter-
clockwise until the adjusting spring
pressure is fully released.
Step 4.
Standing to the side of the
nitrogen cylinder opposite from the
Pressure Regulator, slowly crack open
the Cylinder Control Valve until the cyl-
inder pressure is indicated on the High
Pressure Gauge and then fully open
the Cylinder Control Valve to seal its
packing.
Step 5.
Slowly turn the Two-Stage
Pressure Regulator handle clockwise
until the Outlet Pressure Gauge indi-
cates the required pressure established
in Step 1.
Step 6.
Open the By-Pass Valve in the
Model AMD-3 Device.
Step 7.
Open the control valve in the air
supply trim to the system.
Step 8.
After the system pressure sta-
bilizes, note the value on the system
pressure gauge and compare it with the
requirement. Adjust the Pressure Regu-
lator, as required (counter-clockwise to
decrease and clockwise to increase).
One-half turn of the stem changes the
outlet pressure by approximately 8 psi.
Step 9.
If the system pressure must be
decreased, first re-adjust the Pressure
Regulator, then momentarily open a
connection to the system to reduce the
pressure to below the required value.
Allow the system pressure to automati-
cally stabilize.
Step 10.
Close the By-Pass Valve in the
Model AMD-3 Device.
NOTICE
Following a sprinkler operation, in order
to prevent a delay in the release of the
automatic control valve, the By-Pass
Valve must be closed when the fire pro-
tection system is in service.
Step 11.
Check all supply pressure
connections for leaks.
Care and
Maintenance
The TYCO Model AMD-3 Automatic
Nitrogen Maintenance Device must
be maintained and serviced in accor-
dance with this section, in addition to
any specific requirements of the NFPA.
Any impairment must be immediately
corrected.
Before closing a fire protection system
main control valve for maintenance
work on the fire protection system
that it controls, obtain permission to
shut down the affected fire protection
system from the proper authorities
and notify all personnel who may be
affected by this action.
It is recommended that a spare supply
of nitrogen be kept on hand.
Make no attempt to field-repair or
replace any component of the Pres-
sure Regulator.
Inspections should be made more
frequently, after the system is initially
placed in service, to develop a guide-
line as to the required schedule for
nitrogen cylinder replacement. Graph-
ing the Inlet Gauge pressure noted
during each inspection will assist in
this evaluation.
After placing a fire protection system
in service, notify the proper authorities
and advise those responsible for moni-
toring proprietary and/or central station
alarms.
The owner is responsible for the
inspection, testing, and maintenance of
their fire protection system and devices
in compliance with this document, as
well as with the applicable standards
of the NATIONAL FIRE PROTECTION
ASSOCIATION (e.g., NFPA 25), in addi-
tion to the standards of any authorities
having jurisdiction. Contact the install-
ing contractor or product manufacturer
with any questions.
Automatic sprinkler systems should be
inspected, tested, and maintained by a
qualified Inspection Service in accor-
dance with local requirements and/or
national code.
INSPECTION PROCEDURE
The Model AMD-3 Automatic Nitrogen
Maintenance Device must be inspected
quarterly in accordance with the follow-
ing instructions.
Step 1.
Verify that the control valve
in the air supply trim to the system is
open.
Step 2.
Verify that the nitrogen Cylinder
Control Valve is open.
Step 3.
Verify that the By-Pass Valve
is closed.
NOTICE
Following a sprinkler operation, in order
to prevent a delay in the release of the
automatic control valve, the By-Pass
Valve must be closed when the fire pro-
tection system is in service.
Step 4.
Verify that the system pressure
gauge indicates the same value as the
previously established requirement. If
not, re-adjust per Step 8 of the Operat-
ing Procedure section.
Step 5.
Verify that the Inlet Pressure
Gauge of the Pressure Regulator
indicates sufficient nitrogen cylinder
pressure. It is recommended that the
nitrogen cylinder be replaced whenever
its pressure falls to 200 psi or below.
60
50
40
30
20
10
0
-60
-50
-40
-30
SYSTEM PRESSURE, PSIG
*
BASED ON A DEWPOINT OF -60°F AT ATMOSPHERIC PRESSURE.
NITROGEN, °F
DEWPOINT OF SUPPL
Y
GRAPH A
MAXIMUM DEWPOINT OF SUPPLY NITROGEN AS A
FUNCTION OF SYSTEM PRESSURE*
