Model QRS Electronic Accelerator
(Quick Opening Device)
For Dry Pipe or Preaction Systems
Page 1 of 16
SEPTEMBER 2021
TFP1100
Worldwide
Contacts
www.tyco-fire.com
IMPORTANT
Refer to Technical Data Sheet
TFP2300 for warnings pertaining to
regulatory and health information.
General
Description
The TYCO Model QRS Electronic
Accelerator is a quick opening device
intended to reduce the operating time
of a dry pipe valve in a dry pipe system
or an automatic control valve (deluge
valve) in a double interlock electric/
electric preaction system.
The control panel for the QRS may be
used with up to four QRS switches for
one to four system risers using one of
the following dry pipe valves:
• TYCO 4 in. & 6 in. (DN100/150)
Model DPV-1 Dry Pipe Valves
• Central 3 in. (DN80) Model AF or
Central 4 in. & 6 in. (DN100/150)
Model AF/AG Dry Pipe Valves
• Gem 4 in. & 6 in. (DN100/150) Model
F302/F3021 Dry Pipe Valves
• Star 4 in. & 6 in. (DN100/150) Models
A or A-1 Dry Pipe Valves
The control panel for the QRS may
be used with one QRS switch for one
system riser using the following auto-
matic control valve (deluge valve) used
in a double interlock electric/electric
preaction system:
• TYCO 1-1/2 in. through 8 in. (DN40
through DN200) DV-5
A
Deluge Valve
The Model QRS Electronic Accelerator
(see Figure 1) utilizes a unique system
air pressure monitoring device (UL and
C-UL Listed, as well as FM Approved,
Model QRS Extinguishing System
Attachment) that continuously samples
air pressure twice per sec ond. When
the air pressure is deter mined to have
a sustained drop ex ceeding a rate of
0.1 psi (0,007 bar) per second as veri-
fied by three con secutive samplings,
the QRS signals the Releasing Panel
(Model PFC 4410-RC) via its “Panel
Input” initiating zone circuit, which
energizes the Sole noid Valve.
In the case of a dry pipe valve, the
energized Solenoid Valve introduces
system air pressure to the interme-
diate chamber of the dry pipe valve.
This pressure neutralizes the differen-
tial pressure holding the dry pipe valve
closed and permits it to open.
In the case of a double interlock elec-
tric/electric preaction system, the
energized Solenoid Valve releases dia-
phragm pressure from the automatic
control valve (deluge valve) to permit
the automatic control valve (deluge
valve) to open.
The Model QRS Electronic Accelera-
tor automatically adjusts to both small
and slow changes in system pressure,
but trips when there is a steady drop
in pressure (as in the case of sprinkler
operation).
The QRS Electronic Accelerator fea-
tures the following:
• Operation of a dry pipe or preaction
valve within four seconds — inde-
pendent of various combinations of
system initial air pressures, system
volumes, or sprinkler K-factors
• One Releasing Panel can control
up to four dry pipe systems or one
double interlock preaction system
• Built-in low pressure and high
pressure alarm supervision
• Proven electric release technology
as used for electrically operated
del uge and preaction systems
• Battery back-up in the event of
primary power failure
NOTICE
The Model QRS Electronic Accel-
erator described herein must be
installed and maintained in compli-
ance with this document, as well as
with the applicable standards of the
NATIONAL FIRE PROTECTION ASSO-
CIATION (NFPA), in addition to the
standards of any other authorities
having jurisdiction. Failure to do so may
impair the performance of this de vice.
The owner is responsible for main-
taining their fire protection system
and devices in proper operating con-
dition. Contact the installing contrac-
tor or sprinkler manufacturer with any
questions.
The QRS uses electronic compo-
nents to monitor the system air pres-
sure. Keep all radio transmitters or RF
sources at least one foot from the QRS.
Failure to do so could result in an unin-
tended operation of the dry pipe or pre-
action system.
For additional information please refer
to the Potter Electric Signal Company
Data Sheet #5471131 for the QRS
Quick Release Switch and/or Manual
#5403550 for the PFC-4410RC Releas-
ing Panel.
Technical
Data
Approvals
UL Listed:
The Model QRS Electronic
Accelera tor is UL Listed per UL1486
for a maximum system capacity of
1690 gal (6397 L) for a single nom-
inal 5.6 K-factor sprinkler and a
maximum working water pressure
of 175 psi (12,1 bar).
FM Approved:
The Model QRS Electronic
Accelera tor is FM Approved based
on the sensitivity criteria provided
in Graph A and a maximum working
water pressure of 250 psi (17,2 bar).
Listings and Approvals are under
the name of Potter Electric Signal
Com pany.
