Automatic
Air Maintenance Device,
Pressure Reducing Type
Model S460
GENERAL DESCRIPTION
The Star Model S460 Automatic Air Maintenance Device
is an automatic, field-adjustable device of the pressure re-
ducing type. 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 S460 is utilized in applications where there is a com-
pressed air (or nitrogen) source which is controlled at a
higher pressure than the desired system pressure.Pres-
sure sources include plant air supplies having their own
automatic compressor controls, or nitrogen supplies hav-
ing single-stage cylinder mounted pressure regulators.
WARNING
The Model S460 Automatic Air Maintenance Device de-
scribed herein must be installed and maintained in compli-
ance with this document, as well as with the applicable
standards of the National Fire Protection Association, in
addition to the standards of any other authorities having
jurisdiction. Failure to do so may impair the integrity of
this device.
The owner is responsible for maintaining his fire protec-
tion system and devices in proper operating condition.
The installing contractor or sprinkler manufacturer should
be contacted relative to any questions.
TECHNICAL DATA
Approvals
UL and ULC Listed.FM Approved.
Maximum Inlet Air (or Nitrogen) Supply Pressure
200 psi (13.8 bar)
Field Adjustable Outlet Pressure Range
5 to 60 psi (0.4 to 4.1 bar)
Factory Set Outlet Pressure
35 psi (2.4 bar)
Assembly
Major components illustrated in Figure 1 are factory as-
sembled with black steel nipples and malleable iron pipe
fittings.
OPERATION
The Bypass Valve in the S460 is opened to fast fill the
system during the initial pressurization.Once the required
system pressure has been reached, the Bypass Valve is
closed and the Air Supply Control Valve is left open to
place the S460 in automatic operation.
If there is a slight leak in the system, the Pressure Regu-
lator will automatically maintain system pressure at the
preset level. The 1/8 inch (3.2 mm) orifice in the Restric-
tor Check Valve limits the flow of air from the Pressure
Regulator into the system to a value which is significantly
less than that which will be exhausted by the operation of
a 5.6 K-Factor sprinkler.
INSTALLATION
The Model S460 Automatic Air Maintenance Device must
be installed in accordance with the following instructions:
A. Connections between the inlet air supply and the S460,
as well as between the S460 and the system to be pres-
surized, are to be a minimum of 1/2 inch (DN15) pipe
size.
B. A 1/2 inch (DN15), non-spring loaded, rubber faced,
swing type check valve (#460491004) must be located
between the S460 and the system to be pressurized. A
check valve of this type is provided in the air supply trim
of Star dry pipe valves, preaction valves, and dry pilot
trim.
NOTE
Suitable consideration must be given to the removal of ex-
cessive moisture from the compressed air supply.
414-570-5000 • 800-558-5236 • FAX 414-570-5010 2-00
2-5.3.11
STAR SPRINKLER INC.
www.starsprinkler.com
#1612
