ELECTRICAL GAS VALVE APPLICATIONS
110 VAC electrical gas valves may be used in place of the mechanical gas valves. The electric shut-off valve
used with the Amerex Restaurant Fire Suppression System must be UL listed for use with natural gas or
propane, be held open by energizing an electric solenoid and be wired through a snap action switch and
manual release relay. A qualified electrician must do any field wiring and connections involving the shut-down
of electrical cooking equipment or an electric gas valve.
ELECTRIC GAS VALVE OPERATION
Power to the electric gas valve is run through the normally closed contact on a micro-switch located in the
Pneumatic Release Module (PRM) or Mechanical Release Module (MRM & MRM II) to the Manual Reset Relay
and from the Manual Reset Relay to the electric gas valve. In a normal (non fire) condition, current is allowed to
flow to the solenoid on the electric gas valve, holding the valve open. In a fire condition, when the release
module actuates the suppression system, the micro-switch contacts will transfer, opening the normally closed
contacts in the manual reset relay, interrupting current to the gas valve and cause it to close.
Resetting the MRM, MRM II or PRM and transferring the contacts back to a normal (normally closed) position
will not cause the electrical gas valve to open. The manual reset relay must be reset before current will flow to
the valve and cause it to open. A loss in electrical power, even temporary or momentary, will require someone
to manually reset the relay before the electrical gas valve will open again.
NOTE: SEE WIRING SCHEMATIC ON THE NEXT PAGE – A WIRING SCHEMATIC IS PACKED WITH
EACH MANUAL RESET RELAY.
December 2008
Section 3 KP Design
Page 3 – 40
Amerex Restaurant Fire Suppression System (EX 4658)
P/N
Size
Manufacturer
12870
¾”
Asco
12871
1”
12872
1¼”
12873
1½”
12874
2”
12875
2 ½”
12876
3”
