Johnson Controls tyco AMD-2 Manual

Model AMD-2 Automatic Air Maintenance Device
Compressor Control Type with
Field-Adjutable Pressure Switch
General
Description
The TYCO Model AMD-2 Automatic Air
Maintenance Device is an automatic,
field-adjustable device that controls
the on-off cycling of an air compres-
sor. It is used to control the pressure in
a dry pipe sprinkler system, preaction
system, or dry pilot line of a dry pilot
actuated deluge or preaction valve.
The Model AMD-2 Device is utilized
in applications requiring the use of a
small, non-tank mounted compressor
dedicated to system pressurization.
The Model AMD-2 Device monitors
system pressure and automatically
cycles the air compressor on and off
to maintain system pressure within
preset limits.
The Model AMD-2 Device features a
Pressure Switch with integral unload-
ing valve that automatically bleeds the
pressure between the air compressor
and the Model AMD-2 Device after the
air compressor automatically shuts off.
This feature prevents start-up of the air
compressor under load.
The Model AMD-2 Device is a re-desig-
nation for the Central Model DU-2, Gem
Model F326, and Star Model S465.
NOTICE
The Model AMD-2 Automatic Air Main-
tenance Devices described herein must
be installed and maintained in compli-
ance with this document and with the
applicable standards of the NATIONAL
FIRE PROTECTION ASSOCIATION, in
addition to the standards of any author-
ities having jurisdiction. Failure to do so
may impair the performance of these
devices.
IMPORTANT
Refer to Technical Data Sheet
TFP2300 for warnings pertaining to
regulatory and health information.
Page 1 of 4
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
NEMA Rating
The housing of the Pressure Switch meets
NEMA 1 requirements.
Field-Adjustable Pressures
Minimum Cut-In (On) 14 psi (1,0 bar)
Maximum Cut-Out (Off) 60 psi (4,1 bar)
Pressure Switch Differential
6 psi (0,4 bar)
The switch ratings are as follows:
115 VAC, 1 Phase . . . . . . . . . . . . . . . . . . . . 2 HP
230 VAC, 1 Phase . . . . . . . . . . . . . . . . . . . . 3 HP
230 VAC, 3 Phase . . . . . . . . . . . . . . . . . . . . 5 HP
575 VAC, 3 Phase . . . . . . . . . . . . . . . . . . . . 5 HP
115 VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 HP
230 VDC . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 HP
Factory-Set Outlet Pressure
35 to 41 psi (2,4 to 2,8 bar)
Assembly
Major components illustrated in Figure
1 are factory-assembled, galvanized
steel nipples and malleable iron pipe
fittings.
AUGUST 2018
Worldwide
www.tyco-fire.com
Contacts
Operation
The By-Pass Valve in the Model AMD-2
Automatic Air Maintenance Device
is opened to quickly fill the system
during initial pressurization. After
the cut-out pressure of the Pressure
Switch is reached, its actuating lever
transfers the DPDT switch contacts to
shut off the air compressor and open
the unloader valve to bleed pressure
between the air compressor and the
Restrictor Check Valve. The By-Pass
Valve is then closed to place the Model
AMD-2 Device in automatic operation.
The Restrictor Check Valve prevents
the unloader valve from bleeding down
the system. With the By-Pass Valve
closed, its 3/32 in. (2,4 mm) orifice
limits air flow into the system to a value
significantly less than that exhausted
by the operation of a 5.6 K-factor
sprinkler.
When there is a small leak in the
system, the Pressure Switch automati-
cally transfers its contacts at the cut-in
pressure to start the air compressor
and shuts off the air compressor after
the cut-out pressure is reached.
TFP1231