QRS
QUICK RELEASE SWITCH
MFG. #5471131 - REV M
2/08
PRINTED IN USA
PAGE 1 OF 4
UL, cUL Listed, FM Approved, and CE Marked
Service Pressure:
250 PSI (17.24 BAR)
Pressure Connection:
1/2" NPT Male Brass
Enclosure:
Cover - Die-Cast external surface with
gray
powdercoat
fi nish. Base - Plated Steel
Pressure Range:
5 - 70 PSI (.34 - 4.83 BAR) (See preset pressure
setting
chart)
Differential:
Approx. 1 PSI (.07 BAR)
Burst Pressure:
Min 1000 PSI (68.95 BAR)
Environmental Specifi cations:
Indoor use only NEMA 1/IP50
Rated Enclosure
Temperature range:-40°F to 140°F
(-40°C
to
60°C)
Immunity:
EN61000-4-3/IEC1000-4-3: Immunity to Radio
Frequency Electromagnetic Fields, (Level 3: 10V/m)
EN61000-4-6/IEC1000-4-6: Immunity to Radio
Frequency Induced Conducted Disturbances,
(Level 3, 10V
rms
) The cover must be securely
fastened to the base to ensure metal to metal contact.
Power Requirements:
Standby: 40 mA at 24 VDC
Max
Alarm
80
mA
Contact Ratings:
Alarm and high/low air 5 amps at 25 VDC
Cover tamper .1 amp at 25 VDC
Service Use:
Automatic
Sprinkler
NFPA-13
Residential occupancy up
NFPA-13R
to
four
stories
National Fire Alarm Code
NFPA-72
Potter Electric Signal Company
•
2081 Craig Road, St. Louis, MO, 63146-4161
•
Phone: 800-325-3936/Canada 888-882-1833
•
www.pottersignal.com
The QRS is a microprocessor based pressure switch designed to
monitor the air pressure in a dry pipe fi re sprinkler system and replace
a mechanical air accelerator when used with a PFC Series Fire Alarm
Releasing Panel, and an approved solenoid valve.
High/Low air indication:
One normally open contact that closes if
the normal air pressure in the system increases or decreases beyond
a given point. (see system air pressure setting chart) Preset pressure
settings set by 10 position rotary switch on pc board. Normally wired
to the supervisory circuit of the fi re alarm panel. Factory set to
position #2 for a normal system air pressure of 30 PSI
Alarm indication:
One normally open contact that closes if
the pressure drops at a rate of .1 PSI (.007 BAR) per second or
greater (indicates an open sprinkler head, normal response time is
approximately 2 seconds) or if the pressure drops to 5.5 PSI (.38
UL Listed Extinguishing System
Attachment 354L & Accelerator 456A
U.S. Patent Number 5,971,080
Stock number - 1341300
BAR). The QRS must be wired to a PFC Series Fire Alarm Releasing
Panel that operates an approved electric solenoid valve on the dry
pipe sprinkler system. Its function is to dump air into the intermediate
chamber, tripping the alarm valve. This is used to replace a
mechanical air accelerator and gives a much faster response time.
Cover tamper:
One normally open contact that closes when the cover
is removed. May be wired to Supervisory Circuit condition on the fi re
alarm panel.
Loss of power results in an open circuit on the alarm input terminals
and causes a Trouble Condition on the Releasing Panel.
High/Low air contacts automatically reset when the pressure returns
to normal.
Alarm contacts:
Automatically reset after 30 seconds for .1 PSI (.007
BAR) per second drop.
Latch in alarm for critical low air (5.5 PSI) (.38 BAR) and reset at 6.5
PSI (.45 BAR).
The QRS must be wired using shielded cable in metal conduit (rigid or
fl exible). Connect drain wire of shield to earth ground of the panel only.
Do not connect drain wire to the QRS. Shielded cable: 6 conductor, 22
AWG stranded, PVC jacket, overall foil shield with drain. (Alpha wire
type 5196C or equivalent.)
When the QRS is installed in accordance with these installation
instructions, compliance to the above immunity standards
indicates the equipment's design provides reasonable immunity
from radio frequency sources. Intentionally subjecting the
equipment to radio frequency sources could result in unintended
operation of the dry pipe system.
Keep all radio transmitters or RF sources at least ONE foot from the QRS.
Failure to do so could result in unintended operation of the dry pipe system.
