2-28. AUXILIARY EQUIPMENT (CONT).
Under arctic conditions, danger of frostbite exists. Mask can
be put on, but air duct hose socket should not be connected to
mask canister until M-3 heater has been on for 15 minutes.
Failure to follow proper procedures may cause serious injury
Connect two air duct hose breakaway sockets (7) to canisters (2) of
protective masks (1) and breathe through masks.
There are two M-3 heaters. Both are the same.
Heater indicator light will go off and on during normal heater
If air is too cold to breathe comfortably, turn knob (9) clockwise until heater
indicator (10) lights. To adjust temperature:
Turn knob (9) clockwise for warmer air.
Turn knob (9) counterclockwise for cooler air.
When heater is no longer needed, turn control knob (9) counterclockwise to
Perform Steps (10) through (14) only when NBC attack is
over or when ordered to do so.
When protective masks (1) are no longer needed, disconnect air duct hose
breakaway sockets (7) from canisters (2).