Model AMD-1 Automatic Air Maintenance Device
Pressure Reducing Type with
Field-Adjustable Pressure Regulator
Technical Services
800-381-9312 | +1-401-781-8220
www.tyco-fire.com
Page 1 of 4
JULY 2010
TFP1221
General
Description
The TYCO Model AMD-1 Automatic Air
Maintenance Device is an automatic,
field-adjustable, pressure reducing
device. It is used to control the pres-
sure in a dry pipe sprinkler system, pre-
action system, or dry pilot line system
of a dry pilot actuated deluge or preac-
tion valve.
The Model AMD-1 Device is utilized
in applications where there is a com-
pressed air (or nitrogen) source con-
trolled at a higher pressure than the
desired system pressure. Pressure
sources include plant air supplies with
their own automatic compressor con-
trols or nitrogen supplies with sin-
gle-stage, cylinder-mounted pressure
regulators.
The Model AMD-1 Automatic Air Main-
tenance Device is a re-designation for
the Central Model D-2, Gem Model
F324, and Star Model S460.
NOTICE
The Model AMD-1 Automatic Air Main-
tenance Devices described herein
must be installed and maintained in
compliance with this document and
with the applicable standards of the
National Fire Protection Association,
in addition to the standards of any
authorities having jurisdiction. Failure
to do so may impair the performance
of these devices.
Owners are responsible for maintain-
ing their fire protection system and
devices in proper operating condition.
The installing contractor or sprinkler
manufacturer should be contacted
with any questions.
Technical
Data
Approvals
UL and C-UL Listed
FM Approved
NYC Approved under MEA 206-02-E
Maximum Inlet Air (or Nitrogen)
Supply Pressure
200 psi (13,8 bar)
Field-Adjustable Outlet Pressure
Range
5 to 70 psi (0,4 to 4,8 bar)
Assembly
Major components illustrated in Figure
1 are factory assembled with galva-
nized steel nipples and malleable iron
pipe fittings.
Operation
The By-Pass Valve in the Model AMD-1
Automatic Air Maintenance Device is
opened to quickly fill the system during
initial pressurization. Once the re quired
system pressure has been reached,
the By-Pass Valve is closed and the Air
Supply Control Valve is left open to
place the Model AMD-1 Device in auto-
matic operation.
When there is a small leak in the sys-
tem, the Pressure Regulator automati-
cally maintains system pressure at the
preset level. The 3/32 inch (2,4 mm) ori-
fice in the Restrictor Check Valve limits
the flow of air from the Pressure Regu-
lator into the system to a value signifi-
cantly less than that exhausted by the
operation of a 5.6 K-factor sprinkler.
Installation
The TYCO Model AMD-1 Automatic Air
Maintenance Device must be installed
in accordance with the following
instructions.
NOTICE
Moisture build-up can adversely affect
performance. Suitable consideration
must be given to the removal of exces-
sive moisture from the compressed air
supply.
1. Make connections a minimum of
1/2 inch (DN15) pipe size between
the inlet air supply and the Model
AMD-1 Device, as well as between
the Model AMD-1 Device and the
system to pressurize.
2. Place a 1/2 inch (DN15), non-spring
loaded, rubber-faced, swing-type
check valve between the Model
AMD-1 Device and the system to
pressurize. A check valve of this
type is provided in the air supply
trim of TYCO dry pipe valves, pre-
action valves, and dry pilot trim.
