SPOT DETECTION NETWORK LIMITATIONS: MRM & MRM II
Optimum fire suppression system performance relies on proper detection network design. This section
discusses the type of detectors used, their selection, and placement and design limitations.
The Amerex Restaurant Fire Suppression System MRM & MRM II uses a continuous cable, corner pulleys,
detector bracket, detector linkage, fusible links, conduit offset, terminal link connector and a temperature-
measuring device.
The quantity of detectors to be used in a system will depend on the number of ducts, number of appliances and
the location of the appliances under the hood.
DETERMINING SPOT DETECTOR LOCATION AND NUMBER OF DETECTORS
In order to detect a fire in the duct, a detector is required to be placed within the duct opening or up to 12 inches
into the duct. If it is mounted into the duct, the bracket shall not shield the fusible link from the hot vapors
moving through the duct.
Every appliance under the hood that is being
protected by the suppression system must
have a detector placed over it and
positioned within the path of exhaust vapors.
WARNING: DO NOT LOCATE DETECTORS
DIRECTLY IN THE PATH OF GAS APPLIANCE
EXHAUST FLUE GASES. DOING SO COULD
RESULT IN UNNECESSARY DISCHARGE OF
THE SYSTEM.
GENERAL LIMITATIONS OF DETECTION NETWORK
:
Maximum of 30 corner pulleys. (either style)
Maximum of 30 detectors (any combination of temperature settings).
Maximum of 200 feet of cable on the detection network.
No pulley tees are allowed.
Remote manual pulls are not allowed on the detection network.
Maximum of 1 conduit offset (must be located at mechanical release module when chosen).
December 2008
Section 3
KP Design
Page 3 – 34
Amerex Restaurant Fire Suppression System (EX 4658)
MRM
CONDUIT OFFSET
(OPTIONAL)
12 O'CLOCK
POSITION
6 O'CLOCK
POSITION
3 O'CLOCK
POSITION
CABLE LENGTH AND CORNER
PULLEY MAXIMUMS AS
SPECIFIED
ATTACH DETECTION NETWORK
TO ANY ONE OF THREE SIDES.
P/N 12508 DETECTOR BRACKET
ASSEMBLY MAXIMUM QUANTITY AS
SPECIFIED.
P/N 12859 TERMINAL LINK CLAMP
INSTALL IN CONDUIT CONNECTOR
OF LAST DETECTOR BRACKET
ASSEMBLY.
