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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
C.2 Auxiliary Components
is section contains the technical information on non-standard parts.
C.2.1 Explosion-Proof Pressure Switch, Manual Reset
P/N 97429 (See Figure C.2.1)
A manually reset NEMA 7 and 9 Explosion-Proof Discharge
Pressure Switch (P/N 97429) can be used in potentially explosive
atmospheres to send indication of agent discharge to a releasing
panel and/or initiate the shut down of equipment that may deplete
agent concentration. It has two tandem double pole, double throw
(DPDT) switches operating in parallel with contacts rated 15 Amps
at 125/250/480 VAC and 0.5 Amps at 125 VDC. It is factory set at
50 psig (3.44 bar) rise.
e switch is Underwriters Laboratories Listed by the manufacturer
Solon Manufacturing Company under the following file numbers:
Industrial Controls Equipment Type 4 & 12, File E130423,
Pressure Operated Switch for Hazardous Locations,
Class I, Groups C & D; Class II, Groups E, F, & G File E65371
C.2.2 Weather-Proof Pressure Switch, Self-Restoring
P/N 98580 (See Figure C.2.2)
A weather-proof self-restoring discharge pressure switch can be used to
send indication of agent discharge to a releasing panel and/or initiate
the shut down of equipment that may deplete agent concentration.
e switch sends an indication of agent discharge at 21 psig (1.45 bar), on
the rise, to a PLC. It is a single pole, double throw (SPDT) switch with 5
amps resistive and 5 amps inductive at 125 VAC & 250 VAC and 0.5 amps
resistive and 0.25 amps inductive at 125 VDC.
e switch has a temperature rating of -20°F to 180°F (-28°C to 82°C) and
a proof pressure of 3000 psig (206.9 bar). e body material is aluminum and
has a brass connection.
Manual Reset
3/4” (20 mm) FNPT
Conduit Outlet
1/4” (8 mm) FNPT
Process Outlet
Figure C.2.1 Explosion-Proof
Pressure Switch, Manual Reset
Figure C.2.2 Weather-Proof
Discharge Pressure Switch
Appendix C
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