2-7. FUNCTIONAL TEST (CONT).
Close shelter door and protective
Main fan must start and run.
Set POWER switch (14) to ON.
MASK indicator light (9) will flash.
Warning horn (10) will sound until
shelter is pressurized (approxi-
mately 30 seconds).
Allow horn to silence automati-
MASK light (9) will go off and
cally. This will indicate proper sys-
warning horn (10) will silence when
proper shelter pressure is reached.
ENTRANCE LOW PRESSURE
light (11) will light when filter unit is
started and then go off when pro-
per protective entrance pressure is
When loss of power to the collec-
tive protection equipment occurs
with the compartment control
module POWER switch in the ON
position, the MASK light (9) will
flash and warning horn (10) will
MASK light (9) will flash.
Open shelter door.
Warning horn (10) will sound.
Button will stay in pressed position.
Press HORN OFF button (20).
Warning horn will stop sounding.
MASK light (9) will light and stay