Tyco AMD-1 Quick Start Manual

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Model AMD-1 Automatic Air Maintenance Device
Pressure Reducing Type with
Field-Adjustable Pressure Regulator

General
Description

The TYCO Model AMD-1 Automatic Air
Maintenance Device is an automatic,
eld-adjustable, pressure reducing
device. It is used 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-1 Device is utilized
in applications where there is a com­pressed air (or nitrogen) source con­trolled at a higher pressure than the
desired system pressure. Pressure
sources include plant air supplies with
their own automatic compressor con­trols or nitrogen supplies with sin­gle-stage, cylinder-mounted pressure
regulators.

The Model AMD-1 Automatic Air Main­tenance 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 Main­tenance 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 maintain­ing 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 galva­nized steel nipples and malleable iron
pipe ttings.

Operation

The By-Pass Valve in the Model AMD-1
Automatic Air Maintenance Device is
opened to quickly ll 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 auto­matic operation.

When there is a small leak in the sys­tem, the Pressure Regulator automati­cally maintains system pressure at the
preset level. The 3/32 inch (2,4 mm) ori­ce in the Restrictor Check Valve limits
the ow of air from the Pressure Regu­lator into the system to a value signi­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 exces­sive 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, pre­action valves, and dry pilot trim.

Page 1 of 4 JULY 2010 TFP1221

TFP1221

Page 2 of 4

2"

(50,8 mm)

3-1/4"

(82,6 mm)

8-1/2"

(215,9 mm)

1/2" NPT
OUTLET

CONNECTION

(TO SYSTEM)

LABEL

RESTRICTOR

CHECK VALVE

P/N 92-326-1-003

Setting
Procedure

The TYCO Model AMD-1 Automatic
Air Maintenance Device must be set
in accordance with the following
instructions.

1. Determine the pressure that meets
the minimum requirements of the
system to pressurize.

2. Close the Model AMD-1 By-Pass
Valve, and close the Model AMD-1
Air Supply Control Valve.

3. Open the control valve in the air
supply trim of the system to pres­surize and then reduce the system
air pressure to 0 psi.

4. Close the control valve in the
air supply trim of the system to
pressurize.

5. Remove the system pressure gauge
from its connection and temporarily
install it in the 1/4 inch NPT Model
AMD-1 Gauge Test Port.

CAUTIO N

Before removing the plug, make
certain that the piping to which the
Model AMD-1 Gauge Test Port is
connected is at 0 psi. Failure to do
so may result in personal injury or
property damage.

6. Open the Air Supply Control Valve in
the Model AMD-1 Device.

16-1/8""

(409,6 mm)

1/4" NPT

GAUGE

TEST PORT

PRESSURE

REGULATOR

(ADJUSTABLE)

P/N 92-324-1-012

STRAINER

P/N 52-353-1-002

FIGURE 1

MODEL AMD-1

AUTOMATIC AIR MAINTENANCE DEVICE

7. While observing the relocated pres­sure gauge, adjust the output pres­sure of the Pressure Regulator. Pull
the knob out and away from the
Pressure Regulator body and then
slowly turn the knob clockwise, as
viewed from the knob end of the
Pressure Regulator, to increase
pressure, and counter-clockwise to
decrease pressure.

When decreasing pressure, the air
pressure must be relieved down­stream of the Pressure Regulator
by temporarily opening the control
valve in the air supply trim of the
system to pressurize, assuming that
the system to pressurize is at 0 psi.

After the Pressure Regulator is set,
push the knob in and towards the
Pressure Regulator body to “snap”
it in a locked position.

8. Close the Air Supply Control Valve
in the Model AMD-1 Device.

9. Return the system air pressure
gauge to its normal location. Re­install the 1/4 inch pipe plug in the
Model AMD-1 Gauge Test Port.
Apply pipe-thread sealant sparingly
to the plug threads only.

CAUTIO N

Before removing the pressure
gauge, make certain that the piping
to which the Model AMD-1 Gauge
Test Port is connected is at 0 psi.
Failure to do so may result in per­sonal injury or property damage.

BY-PASS VALVE

(NORMALLY

CLOSED)

P/N 46-047-1-004

1/2" NPT

INLET CONNECTION

(FROM COMPRESSED

AIR SUPPLY)

AIR SUPPLY

CONTROL VALVE

(NORMALLY OPEN)

P/N 46-048-1-002

10. Open the control valve in the
air supply trim to the system to
pressurize.

11. Open the Air Supply Control Valve
in the Model AMD-1 Device.

12. Open the By-Pass Valve in the
Model AMD-1 Device.

13. Close the By-Pass Valve after the
system is pressurized to approxi­mately 5 psi (0,4 bar) less than the
minimum required system pres sure
determined in Step 1.

14. After the system pressure stabi­lizes, note the value and compare
with the requirement. Re-adjust the
Pressure Regulator, as required.

NOTICE

If the system was over-pressur­ized during manual fill, open a
suitable connection to the system
and manually reduce the pressure
to the desired value. The Model
AMD-1 Automatic Air Maintenance
Device then automatically maintains
the preset system pressure. The
Restrictor Check Valve prevents
the Pressure Regulator from bleed­ing down the system pressure.

In order to minimize the time for
system trip in the event of a sprin­kler operation, set the system pres­sure at the minimum required value.