RIB PRESSURE Gage/Switch 1A4A4PG2
Indicates air pressure in air beams. During normal operation, rib pressure gage varies
between adjustable set points of 1.5 and 2.9 psi. An internal switch causes control system to
start rib fan when pressure drops to 1.5 psi and stops fan when pressure reaches 2.9 psi.
NBC SHELTER PRESSURE Gage/Switch 1A4A4PG1
Indicates difference in air pressure between interior of CBPS and outside ambient air pressure
in iwg. A pressure differential equal to or greater than 0.5 iwg prevents any airborne
contaminants from entering the CBPS. An internal switch causes an alarm indicator (18) to
light and an audible alarm (15) to sound if differential pressure falls below 0.5 iwg.
ESS MODE Selector Switch 1A4A4S17
Selects CBPS HEAT, OFF, VENT or COOL positions. Must be on for Environmental Control
Unit (ECU) operation. Hydraulic system will not engage and air beams will not inflate with
Environmental Support System (ESS) MODE selector switch in OFF position.
DANGER HYD OIL TEMP Indicator 1A4A4DS32
HYD OVERHEAT lights (red) when hydraulic fluid temperature reaches 230F. An internal
switch causes an unmutable audible alarm (38) to sound.
NBC ALARM 1A4A4LS1
Mutable audible alarm whenever the differential air pressure is below minimum set point
(normally 0.5 iwg) and ALARM MUTE switch (20) is disengaged.
RIB INFLATION PRESSURE Indicator 1A4A4DS16/DS17
When rib fan is turned on, the LOW pressure indicator lights (red) and remains lit until
pressure passes beyond low pressure set point (1.5 psi for normal conditions). At that point,
NORMAL indicator lights (white), LOW indicator goes out, and air beam inflation system
continues to pressurize air beams until the high set point is reached (2.9 psi). The cycle will
repeat when air beam pressure drops below low pressure set point (1.5 psi normal).
MISSION PROFILE MOBILE/STATIC Switch/Indicator 1A4A4S8/DS11/DS12
Selects CBPS for MOBILE or STATIC mission mode. Indicator lights (white) when either
MOBILE or STATIC mode is selected during operation.
NBC FAN Switch/Indicator 1A4A4S15/16/DS28/29
Manually increases speed of NBC fan for positive over pressurization within ABS. A NBC FAN
ON indicator lights (green) when fan is on. Whenever differential pressure falls below 0.5 iwg,
PRES LOW indicator lights (red) and alarm (15) sounds. When a chemical threat is sensed by
remote M43A1 chemical sensor, the NBC fan switch automatically turns on.
HEATER STAGE 4 Power On Switch/Indicator 1A4A4S5/DS4
Selects heat stage 4 when ESS MODE selector switch is in HEAT position. 10.0 kW HTR ON
indicator lights (green) when switch is pressed. 10 kW TQG supplied with CBPS will not
support this heat setting. Use of this heat stage is only supported utilizing a 30 kW generator
or greater capacity power source.
NBC ALARM (PRESS TO MUTE) Switch/Indicator 1A4A4S10/DS9
Silences audible alarm (15). ALARM MUTE indicator lights (blue) when audio alarm has been