Cold Weather Operation - MSA G1 Operating Manual

Immediately return to fresh air if:
• SCBA free-flows (provides air when not inhaling).
• Low pressure warning device sounds.
• HUD low pressure indicator lights and flashes red.
• Control module alarm button flashes red.
• When the HUD, control module, or low pressure warning device indicates 35% cylinder pres-
sure, immediately return to fresh air.
• If the air flow in the SCBA is reduced: Immediately keep purge pressed. Immediately return to
fresh air.
7.1

Cold Weather Operation

Moisture can cause problems in the SCBA if it freezes. However, moisture can cause freezing
problems even if the surrounding air is above freezing. Air flowing from the cylinder through the
pressure reducer and LGDV 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
temperature may be warmer than 0°C, the temperature inside the LGDV may be lower.
Prior to storage of the SCBA at temperatures below -18°C, verify that the battery module is
equipped with fully charged batteries.
(1) Any water inside could turn to ice and restrict airflow. To keep moisture from entering the full
face mask mounted LGDV, keep the LGDV in the LGDV retainer when not in use.
(2) When the SCBA is away from heat, water spray can freeze on the LGDV surface. Ice can
build up and bind the side buttons. Before entering or re-entering a hazardous atmosphere,
ensure the side buttons are ice-free and operating properly.
(3) Moisture can enter through the cylinder valve or coupling nut when cylinders are replaced on
the SCBA. When replacing cylinders, ensure moisture or contamination does not enter the
system. Remove any ice from these fittings.
(4) Wipe the pressure reducer threads and cylinder valve threads before installing a new
cylinder. Water can contaminate the system and freeze.
(5) When cleaning the SCBA, ensure water does not enter the LGDV.
(6) Thoroughly dry the full face mask and full face mask mounted LGDV after cleaning and disin-
fecting.
(7) Ensure that the Quick-Fill protection cap is in place before storing the SCBA.
NOTICE
Install new batteries in the alkaline battery modules before storing the SCBA at temperatures
below 0°F (-18°C) for an extended period of time. Make sure the rechargeable battery module is
fully charged before storing the SCBA at temperatures below 0°F (-18°C) for an extended period
of time.
During use in cold temperatures, the SCBA can lose and gain connection with the telemetry
module. If the connection to the telemetry module is disconnected, the device will try to reconnect.
The breathing performance of the SCBA is not affected by the telemetry module.
G1 Integrated SCBA System
During Use
GB
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