Tyco AMD-3 User manual

Model AMD-3 Automatic Nitrogen Maintenance
Device High Pressure (Cylinder) Reducing Type
with Field-Adjustable Pressure Regulator
Page 1 of 4 AUGUST 2018 TFP1241
Worldwide
Contacts
www.tyco-fire.com
IMPORTANT
Refer to Technical Data Sheet
TFP2300 for warnings pertaining to
regulatory and health information.
General
Description
The TYCO Model AMD-3 Automatic
Nitrogen Maintenance Device is an
automatic, field-adjustable, nitrogen
maintenance device of the high pres-
sure reducing type. The Model AMD-3
Device is utilized in conjunction with a
cylinder of high pressure to control the
pressure in a dry pipe sprinkler system,
preaction system, or dry pilot line
system of a dry pilot actuated deluge
or preaction valve.
The Model AMD-3 Device features
a two-stage pressure regulator that
maintains a constant outlet pressure,
as the cylinder pressure decreases to
the set point.
Use of the Model AMD-3 Device is
typically specified in applications for
which a dependable plant or local
air supply is not available; the system
piping requires pneumatic pres-
sure having a maximum dewpoint as
shown in Graph A; or, the presence of
potentially explosive vapors prohib-
its the installation of an automatic air
compressor.
The Model AMD-3 Device is a re-desig-
nation for the Gem Model F328.
NOTICE
The Model AMD-3 Automatic Nitrogen
Maintenance Devices described herein
must be installed and maintained in
compliance with this document and
with the applicable standards of the
NATIONAL FIRE PROTECTION ASSO-
CIATION, in addition to the standards
of any authorities having jurisdiction.
Failure to do so may impair the perfor-
mance of these devices.
The owner is responsible for main-
taining their fire protection system
and devices in proper operating con-
dition. Contact the installing contrac-
tor or product manufacturer with any
questions.
Technical
Data
Approvals
UL and C-UL Listed
FM Approved
NYC Approved under MEA 206-02-E
Maximum Inlet Nitrogen Supply
Pressure
3000 psi (200 bar)
Field-Adjustable Outlet Pressure
Range
4 to 60 psi (0,4 to 4,1 bar)
Inlet Gauge Range
200 to 4000 psi (1000 to 28000 kPa)
Outlet Gauge Range
4 to 100 psi (30 to 700 kPa)
Cylinder Outlet Connection
C.G.A. No. 580
Assembly
Major components illustrated in Figure
1 are factory-assembled, galvanized
steel nipples and malleable iron pipe
fittings. Connection to the system is via
copper tubing and brass tubing fittings.
Design
Criteria
Unless otherwise specified, nitrogen
cylinders with Outlet Connection No.
580 are supplied with nitrogen having
a dewpoint equal to or less than
-60° F (-51°C) at atmospheric pressure.
Graph A illustrates the maximum dew-
point of the supply nitrogen as a func-
tion of the system pressure.
The approximate volume “N” of free
nitrogen (that is, at atmospheric pres-
sure) in cubic feet, required to fill a
system having a capacity of “V” in U.S.
gallons, to a pressure “P” in pounds
per square inch gauge, can be deter-
mined using the formula:
N=0.009VP
A typical cylinder volume is 242 cubic
feet of free nitrogen, but the actual
figure varies depending on the supplier.
The approximate time “T” in minutes to
fill a system having a capacity of “V”
in U.S. gallons, as a function of system
pressure, can be determined using the
formula:
T=CV
where “C” is a constant determined
from the following table:
System Pressure
PSI “C”
20 0.0400
30 0.0424
40 0.0440
50 0.0451
60 0.0457

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Operation
The By-Pass Valve in the Model AMD-3
Automatic Nitrogen Maintenance
Device is opened to quickly fill the
system during initial pressurization.
After the required system pressure is
reached, the By-Pass Valve is closed
and the Cylinder Control Valve is left
open to place the Model AMD-3 Device
in automatic operation.
Given a small leak in the system, the
Pressure Regulator will automatically
maintain system pressure at the preset
level. The 3/32 in. (2,4 mm) orifice in the
Restrictor Check Valve limits the flow of
nitrogen from the Pressure Regulator
into the system to a value significantly
less than that exhausted by the opera-
tion of a 5.6 K-factor sprinkler.
Installation
The TYCO Model AMD-3 Automatic
Nitrogen Maintenance Device must
be installed in accordance with this
section.
Step 1. Assemble the Model AMD-3
Device components as shown in Figure
1. Apply pipe-thread sealant sparingly
to male pipe threads only.
Step 2. Make connections a minimum
of 1/2 (DN15) pipe size between the
Model AMD-3 Device and the system.
Step 3. Place a 1/2 in. (DN15),
non-spring loaded, rubber-faced,
swing-type check valve (such as
P/N 46-049-1-004) between the Model
AMD-3 Device and the system to
pressurize. A check valve of this type
is typically provided in the air supply
trim of TYCO dry pipe valves, preaction
valves, and dry pilot trim.
Step 4. Install a minimum 1/4 in.
size pressure relief valve (such as
P/N 92-343-1020) between the Model
AMD-3 Device and the system piping.
A relief valve of this type is typically
provided in the air supply trim of TYCO
dry pipe valves, preaction valves, and
dry pilot trim.
Step 5. Following the steps outlined in
the caution below, install the nitrogen
cylinder.
CAUTION
The following instructions regarding the
nitrogen cylinder must be strictly fol-
lowed. Failure to do so may result in
personal injury or property damage.
Step A. Secure the cylinder to a wall
or post, ensuring it will not tip or fall if
accidently bumped.
Step B. Inspect the Cylinder Control
Valve outlet for dirt, dust, damaged
threads, oil, or grease. Remove dirt
and dust with a clean cloth. If damaged
threads, oil, or grease are present,
replace the cylinder.
Step C. Inspect the Pressure Regulator
inlet for dirt, dust, damaged threads,
oil, or grease. Remove dirt and dust
with a clean cloth. If damaged threads,
oil, or grease are present, have the
Pressure Regulator serviced by an
authorized agent of the Victor Equip-
ment Company.
Step D. With the cylinder securely in
place and while standing to the side
or rear of the Cylinder Control Valve,
momentarily crack open the Cylin-
der Control Valve. This procedure is
intended to blow out any foreign matter
that may be inside the valve outlet.
Step E. Attach the Model AMD-3
Device to the Cylinder Control Valve
and securely wrench-tighten.
INLET (HIGH
PRESSURE)
GAUGE
C.G.A.
CONNECTION
NO. 580
CONTROL
VALVE
(NORMALLY
CYLINDER
OPEN)
RESTRICTOR
CHECK VALVE
P/N 92-326-1-003
OUTLET (LOW
PRESSURE)
GAUGE
CYLINDER OF
3000 PSI MAX.
NITROGEN
BY-PASS
VALVE
(NORMALLY
CLOSED) 1/4" TUBE,
5 FEET LONG
1/4" MALE NPT
x 1/4" TUBE
CONNECTOR
1/2" NPT OUTLET
CONNECTION
(TO SYSTEM)
TWO-STAGE
PRESSURE
REGULATOR
(ADJUSTABLE)
P/N 92-290-1-001
P/N 46-047-1-002
9-1/2"
(241,4 mm)
12-1/2"
(317,5 mm)
6-1/4"
(158,8 mm)
FIGURE 1
MODEL AMD-3
AUTOMATIC NITROGEN MAINTENANCE DEVICE

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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.
6050403020100
-60
-50
-40
-30
SYSTEM PRESSURE, PSIG
*BASED ON A DEWPOINT OF -60°F AT ATMOSPHERIC PRESSURE.
NITROGEN, °F
DEWPOINT OF SUPPLY
GRAPH A
MAXIMUM DEWPOINT OF SUPPLY NITROGEN AS A
FUNCTION OF SYSTEM PRESSURE*

TFP1241
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NATIONAL FIRE PROTECTION ASSOCIATION and NFPA are registered trademarks of National Fire Protection Association
1400 Pennbrook Parkway, Lansdale, PA 19446 | Telephone [phone]
© 2018 Johnson Controls. All rights reserved. All specifications and other information shown were current as of document revision date and are subject to change without notice.
NITROGEN CYLINDER
REPLACEMENT PROCEDURE
Replace the nitrogen cylinder in accor-
dance with the following instructions.
Step 1. Close the control valve in the
air supply trim to the system.
Step 2. Close the Cylinder Control
Valve.
Step 3. Remove the Model AMD-3
Device from the Cylinder Control Valve
by slowly unscrewing the inlet connec-
tion to the Pressure Regulator.
Step 4. Following the steps outlined in
the caution below, replace the nitrogen
cylinder.
CAUTION
The following instructions with regard
to the nitrogen cylinder must be strictly
followed. Failure to do so may result in
personal injury or property damage.
Step A. Secure the cylinder to a wall or
post, ensuring that it will not tip or fall if
accidently bumped.
Step B. Inspect the Cylinder Control
Valve outlet for dirt, dust, damaged
threads, oil, or grease. Remove dirt
and dust with a clean cloth. If damaged
threads, oil, or grease are present,
replace the cylinder.
Step C. Inspect the Pressure Regulator
inlet for dirt, dust, damaged threads,
oil, or grease. Remove dirt and dust
with a clean cloth. If damaged threads,
oil, or grease are present, have the
pressure regulator serviced by an
authorized agent of the Victor Equip-
ment Company.
Step D. With the cylinder securely in
place and while standing to the side
or rear of the Cylinder Control Valve,
momentarily crack open the Cylin-
der Control Valve. This procedure is
intended to blow out any foreign matter
that may be inside the valve outlet.
Step E. Attach the Model AMD-3
Device to the Cylinder Control Valve
and securely wrench-tighten.
Step 5. Open the Cylinder Control
Valve in accordance with Step 4 in the
Operating Procedure section.
Step 6. Open the control valve in the
air supply trim to the system.
Step 7. Check the Pressure Regulator
connection for leaks.
Limited
Warranty
For warranty terms and conditions, visit
www.tyco-fire.com.
Ordering
Procedure
Contact your local distributor for avail-
ability. When placing an order, indi-
cate the full product name, including
description and Part Number (P/N).
Model AMD-3 Device
Specify: Model AMD-3 Automatic
Nitrogen Maintenance Device,
P/N 52-328-2-001
Replacement Parts
Specify: (description) for use
with the Model AMD-3 Automatic
Nitrogen Maintenance Device,
P/N (Ref. Figure 1)