Tyco VIZOR Manual

Technical Services 800-381-9312 | +1-401-781-8220
VIZOR Electronic Dry Pipe Accelerator (EDPA)
Quick-Opening Device for
Dry Pipe Systems
General
Description
The TYCO VIZOR Electronic Dry Pipe
Accelerator (EDPA) is a quick-opening
device intended to reduce the operat-
ing time of the dry pipe valves listed in
Table A following operation of one or
more automatic sprinklers.
Unlike traditional mechanically oper-
ated quick-opening devices, the VIZOR
Accelerator is a microprocessor-based,
electronic, quick-opening device. The
VIZOR Accelerator automatically adjusts
to both small and slow changes in sys-
tem air pressure, but trips when there
is a steady drop in system air pressure
upon sprinkler operation.
The VIZOR Accelerator features the
following:
• Direct mounting to the riser
• Installation consistent with the in-
stallation of mechanical devices
• Easy test-and-reset function, as
compared to mechanical
accelerators
• Operation of a dry pipe valve within
four seconds — over a wide range
of system volumes, system initial air
pressures, and sprinkler K-factors
• Built-in low-pressure and high-
pressure alarm supervision
• Electronically self-supervising tech-
nology, similar to that used in typ-
ical alarm panels for alarm and
detection systems
• Battery back-up in the event of pri-
mary power failure
The VIZOR Electronic Dry Pipe
Accelerator utilizes a unique, patented
system air pressure monitoring design
that continuously samples the system
air pressure.
Page 1 of 12
www.tyco-fire.com
When the VIZOR Accelerator detects
a sustained drop in air pressure, the
VIZOR Accelerator energizes its internal
solenoid valve.
The energized solenoid valve then
opens to permit system air pressure
into the intermediate chamber of the
dry pipe valve.
The pressurized intermediate chamber
neutralizes the differential pressure
holding the dry pipe valve closed and
permits the dry pipe valve to trip and
flow water into the system piping.
NOTICE
The VIZOR Electronic Dry Pipe
Accelerator described herein must be
installed and maintained in compliance
with this document and with the ap-
plicable 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 this device.
Owners are responsible for maintaining
their fire protection system and devices
in proper operating condition. The install-
ing contractor or sprinkler manufacturer
should be contacted with any questions.
April 2010
For additional information, refer to the
Potter Electric Signal Company Data
Sheet 5401212.
TFP1105