TFP1241
Page 2 of 4
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
