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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
Section 2 System Components and Description
2.5.4 Pressure Release Trip
P/N 20239 (See Figure 2.5.4)
e pressure release trip can be used to release dampers, close fire
doors, windows, louvres, fuel supply valves, to open dump valves,
etc., automatically when the system discharges. e equipment
to be operated must be weight or spring loaded, or be pivoted
off center. e release trip is connected to the system actuation
piping for operation when the system discharges. is actuation
piping must be a clean, dry source of nitrogen only (free from dry
chemical). A cable from the equipment to be controlled is looped
over the pressure release operating stem. When the trip is operated,
the stem retracts and the cable is released. e maximum load that
can be hung on the piston stem is 35 lbs (15.88 kg).
2.5.5 Discharge Indicator
P/N 20238 (See Figure 2.5.5)
e Janus Fire Systems® Discharge Indicator acts as a nonelectrical
visual indicator of system actuation. It is actuated through pilot
pressure and remains in the upright (discharged) position until
manually reset.
Upon system actuation, pressure from the actuation piping enters the discharge indicator, actuating the
internal plunger. is actuation piping must be a clean, dry source of nitrogen only (free from dry chemical).
e actuation pressure forces the external indication stem into the upright (discharged) position. e stem
and plunger remain in the upright position until the discharge indicator is manually reset by depressing the
indication stem into the down (standby) position.
Figure 2.5.4 Pressure Release Trip
Figure 2.5.5 Discharge Indicator
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