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TFP1105
Page 10 of 12
Operation
The TYCO VIZOR Electronic Dry Pipe
Accelerator provides a microproces-
sor-based, electronic, dry pipe valve
accelerator designed to monitor the air
pressure in a dry pipe system and re-
duce the time it takes for the dry pipe
valve to operate following the opening
of one or more sprinklers. The VIZOR
Accelerator can be used in new instal-
lations or to replace mechanical type
accelerators in existing systems.
The VIZOR Accelerator operates upon
detection of a steady drop in air pres-
sure of 0.1 psi per second (0,007 bar/s)
or greater, or if the pressure drops to 5.5
psi (0,38 bar). The VIZOR Accelerator
typically responds to an open sprinkler
in approximately 2 seconds.
Note: Although the VIZOR Accelerator is
designed to respond to an open sprinkler
in approximately 2 seconds, operation
of the dry pipe valve is expected within
4 seconds. The difference of 2 seconds
is a conservative estimation for the dry
pipe valve to physically trip.
Upon detection of a drop in air pressure,
the VIZOR Accelerator opens an internal
solenoid valve allowing system air pres-
sure into the intermediate chamber of
the dry pipe valve. The pressurized in-
termediate chamber neutralizes the dif-
ferential pressure holding the dry pipe
valve closed and permits the valve to
open. The solenoid valve automatically
closes after 30 seconds.
The VIZOR Accelerator contains two
sets of normally open, dry contacts. The
High/Low Supervisory Contacts close
if the normal system air pressure in the
system increases or decreases beyond
a given point (refer to Table B). The ten-
position rotary switch (refer to Figure 2)
provides ten preset pressure settings.
The factory setting is position #4 for a
normal system air pressure of 30 psi.
The Trouble Dry Contacts close during
any one of the following conditions:
• Low-battery condition (up to a
1-minute delay is normal)
• AC power loss (after a 60-minute
delay)
• SET/OFF switch in the OFF position
An internal buzzer sounds during any
off-normal condition.
Installation
The TYCO VIZOR Electronic Dry Pipe
Accelerator must be installed in accor-
dance with the following instructions.
NOTICE
When working on the VIZOR Accelerator
or the dry pipe valve, S1 should be in the
OFF position; otherwise, the dry valve
can inadvertently trip.
Make all pipe fitting connections to the
VIZOR Accelerator inlet and outlet ports
by using the wrench flats on the VIZOR
Accelerator. DO NOT tighten connec-
tions by grasping the VIZOR Accelerator
housing. Failure to do so may result in
damage to the components within the
device.
Install all required conduits and make
all connections with AC power off. The
VIZOR Accelerator must be hardwired
to complete the installation.
During installation, the buzzer may sound.
Silence the buzzer at any time by mo-
mentarily pushing S2 to the SILENCE
position.
The VIZOR Accelerator must be installed
according to applicable NFPA codes (for
example, NFPA 13, 70, and 72) as well
as all local installation codes.
1. Install the VIZOR Accelerator as shown
in Figures 6 and 7. Apply pipe-thread
sealant sparingly to male threads only.
2. Following Figure 2 and Table B, set
the Ten-Position Rotary Switch to the
required setting using the provided
screw driver.
3. As shown in Figure 2, tape the 12V,
1.3 AH Batteries together. Connect
the Harness wires (Leads in Figure
2) to the Batteries, slide the Battery
Assembly into the Housing, and plug
the Harness Connector into the VIZOR
Accelerator circuit board.
For the optional 90-hour batteries,
mount the Remote Battery Enclo-
sure horizontally and within 10 feet
of the VIZOR Accelerator. Splice the
battery cable (Figure 4), connect the
cable to the Batteries, then plug the
Battery Assembly into the VIZOR Ac-
celerator Harness. Lastly, plug the
Harness Connector into the VIZOR
Accelerator circuit board.
4. Close and lock the cover.
5. Push S1 to the OFF position.
6. In order to minimize an inadvertent
primary (A/C) power loss and to
facilitate maintenance, it is recom-
mended that a dedicated circuit be
hardwired to the VIZOR Accelerator.
The following notifications occur:
• The Green AC LED lights, the Amber
Trouble / Supervisory LED lights,
the Red Tripped LED lights, and
the buzzer sounds.
• Assuming the batteries are charged,
the Amber Battery Trouble LED re-
mains unlit.
7. Optionally conduct trip tests of the
VIZOR Accelerator and the dry pipe
valve in accordance with the Care
and Maintenance section.
8. Optionally, and/or if required by local
jurisdiction, hardwire a monitoring
circuits to the VIZOR Accelerator's
Trouble and High/Low supervisory
contacts using 14 to 18 AWG wire.
9. Push S1 to the SET position.
10. Verify proper operation of the VIZOR
Accelerator using the "No Flow Trip
Test for Accelerator Only" procedure
described in the Care and Mainte-
nance section.
Setting
Procedure
As soon as possible after an operation,
reset and restore to service the Dry Pipe
Valve (listed in Table A) and the TYCO
VIZOR Electronic Dry Pipe Accelerator.
NOTICE
Completely drain the system before
proceeding.
After setting a fire protection system,
notify the proper authorities and advise
those responsible for monitoring pro-
prietary and/or central station alarms.
1. Push S1 to the OFF position.
2. Silence the internal audible alarm at
any time by momentarily pushing S2
to the Silence position.
3. Locate of all of the system's low
point drain valves to help facilitate
resetting of the system. Refer to the
appropriate dry valve data sheet for
valve resetting procedures.
4. Follow the resetting procedure for
the installed dry pipe valve. When
the procedure calls for the system
piping to be pressurized with air,
start to pressurize the system and
then proceed to Step 5.
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