Cold Weather Operation - MSA FireHawk M7 Responder Operation And Instructions Manual

Suggested Procedures for Cold Weather Operation
Moisture can cause problems in the air mask if it freezes.
However, moisture can cause freezing problems even if
the surrounding air is above freezing. Air flowing from the
cylinder through the first and second stage regulators
drops from cylinder pressure to close to atmospheric
pressure very quickly. This causes the air to expand and
creates a cooling effect. Although the surrounding tem-
perature may be warmer than 32°F, the temperature inside
the regulator may be lower. Any water inside could turn to
ice and restrict airflow.
1. To keep moisture from entering the mask mounted
regulator, keep the Firehawk Responder Regulator in
the belt mounted regulator holder when not in use.
2. When the air mask is away from heat, water spray can
freeze on the Firehawk Responder Regulator surface.
Ice can build up and bind the side buttons or the
bypass valve. Before entering or re-entering a haz-
ardous atmosphere, ensure the side buttons and

COLD WEATHER OPERATION

29
bypass valve are ice-free and operating properly.
Periodically check the bypass to be sure it is ice-free.
3. Moisture can enter through the cylinder valve or cou-
pling nut when cylinders are replaced on the air mask.
When replacing cylinders, ensure moisture or contami-
nation does not enter the system. Remove any ice
from these fittings. Wipe the coupling nut threads and
cylinder valve threads before installing a new cylinder.
Water can contaminate the system and freeze.
4. NIOSH certification requires a nosecup be used at all
times. The nosecup reduces lens fogging.
5. When cleaning the air mask, ensure water does not
enter the facepiece or Firehawk Responder Regulator.
6. Thoroughly dry the facepiece and mask mounted reg-
ulator after cleaning and disinfecting. Follow
Confidence Plus ® Cleaning Solution instructions.
Note: Fresh batteries must be installed in the FireHawk
M7 Responder HUD and FireHawk M7 Power Module
prior to storage of the air mask at cold temperatures for
an extended period of time.
TAL 803 (L) Rev. 1 - 10086011