Lincoln Electric P709 GUARDIAN CONTROL SOLUTIONS - Manual (Page 56)

B-6 OPERATION B-6
SOLENOID VALVE
See Figure B.4.
Normally closed 3-way 2-position solenoid valve.
When the connected filter system is in operation, the
solenoid is activated and compressed air is supplied to
the cleaning system of the filter (port P and A are
open). If there is a fire alarm or power failure, the sole-
noid will return to its normally closed (NC) position,
closing port P and opening port R. In this position the
compressed air escapes from the pressure tanks locat-
ed inside the filter bank. It also prevents fresh oxygen
from reaching the filter.
FLAME GUARDIAN™
The Flame Guardian™ is a fire suppression generator
designed to be installed directly into the filter system.
The Flame Guardian™ is activated by the Guardian™
Panel fire detection panel 5 seconds after a fire alarm
is activated.
The Flame Guardian™ is designed to suppress or
extinguish filter fires of EN 2 Class A and NFPA 10
Class A (normal or solid combustible material in the fil-
ters).
In 5 to 10 seconds, after a fire is detected, the filter is
filled with a potassium aerosol. This material reacts
with the free radicals in the flame. The free radicals
react with the aerosol instead of the fuel and the chain
reaction of fire is suppressed. The residue is a negligi-
ble amount of harmless and stable potassium hydrox-
ide salt (KOH).
After release of the aerosol, it remains active for at
least 30 minutes, this prevents the fire from reigniting.
Flame Guardian is the name used by LECO for the use
of FirePro aerosol generators in LECO filter systems.
FirePro is a product of Celanova Ltd. Listing and cer-
tifications are registered under the name FirePro.
Number and type of Flame Guardian aerosol fire extin-
guishing generators has been calculated by certified
personnel in conformity with BRL-KZ 3003 and NFPA
2010, based on filter class A, E, safety factor 1.3 and
min. concentration of 55.29 g/m
2 effective component.
GUARDIAN CONTROL™ SOLUTIONS
FIGURE B.4 – SOLENOID VALVE
A
P R
A
P R