Operation; Installation - Tyco VIZOR EDPA Manual

• S1 (Two-Position Switch): Up to
SET to place the VIZOR Acceler-
ator in service when air pressure
matches rotary switch setting; down
to OFF to take the VIZOR Acceler-
ator out of service
• S2 (Two-Position Momentary
Switch): Up to RESET to reset the
VIZOR Accelerator after activation;
down to SILENCE to silence the
buzzer
• Buzzer: Indicates any trouble or
supervisory condition by sounding
an audible alarm
• Trouble Dry Contacts (Normally
Open): Activate on any trouble
condition such as low batteries or
when S1 is pushed into the OFF
position; activate on a loss of AC
power after 60 minutes
• High/Low Dry Contacts (Normally
Open): Activate when system
pressure is outside of the normal
setting of the rotary switch

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
reduce 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-
S1 S2
RESET
SET
HAZARDOUS VOLTAGE MAY BE PRESENT.
DISCONNECT POWER BEFORE SERVICING.
TROUBLE / SUPERVISORY
LED INDICATOR CODES
ON STEADY: SYSTEM TROUBLE
SLOW FLASH: LOW PRESSURE
OFF SILENCE
FAST FLASH: HIGH PRESSURE
OPERATING INSTRUCTIONS
Normal operation: Place S1 to SET after system reaches normal air pressure.
Disable for testing or maintenance: Place S1 to OFF.
Reset after a trip: Place S1 to OFF. After system reaches normal operating pressure,
press S2 to RESET and place S1 to SET.
Note: The accelerator will be in a trouble condition when S1 is placed to OFF. Press
S2 to SILENCE to silence the trouble buzzer.
FIGURE 1
VIZOR ELECTRONIC DRY PIPE ACCELERATOR
FRONT VIEW WITH COVER CLOSED
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 Accelera-
tor typically responds to an open sprin-
kler in approximately 2 seconds.
In order to minimize false trips and
high/low air trouble conditions, the
use of a tank mounted air compres-
sor or plant air in conjunction with the
TYCO AMD-1 Air Maintenance Device
is strongly recommended, The com-
pressor, or plant air, should be set to
maintain a minimum of 10 psi greater
than the required system air pressure.
Note: Although the VIZOR Accelera-
tor is designed to respond to an open
sprinkler in approximately 2 seconds,
operation of the dry pipe valve is
expected within 4 seconds. The dif-
ference of 2 seconds is a conserva-
tive estimation for the dry pipe valve to
physically trip.
Upon detection of a drop in air pres-
sure, the VIZOR Accelerator opens
an internal solenoid valve allowing
system air pressure into the intermedi-
ate chamber of the dry pipe valve. The
pressurized intermediate chamber neu-
tralizes the differential pressure holding
the dry pipe valve closed and permits
the valve to open. The solenoid valve
automatically closes after 30 seconds.
AC POWER
TROUBLE /
SUPERVISORY
BATTERY
TROUBLE
TRIPPED
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 this section.
NOTICE
When working on the VIZOR Accelera-
tor 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
TFP1105
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