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TM 5-4120-377-14
2-21. OPERATION UNDER EMERGENCY CONDITIONS
a. CBR (chemical, biological, radiological) hazard. This unit has provisions for connection to an external
CBR filtering source. Should it be necessary to operate in conditions requiring use of CBR filtration equipment,
see specific instructions for your shelter or facility installation.
Figure 2-21.
CBR Filter Connection Location
b. The following are general suggestions and do not apply if they conflict with instructions for your shelter
or facility installation.
(1) The fresh air damper (door) should be closed, the opening should be covered with a suitable material,
and sealed air tight.
(2) Fresh air damper (door) chain may be taped over to prevent damper from being opened.
(3) The conditioned air inlet louvers should be adjusted (partially or completely) closed in conjunction
with the CBR filter intake volume. This will cause a more positive pressure on inside of shelter or enclosure and
keep air from being drawn in other than through the CBR filter.
c. Power conservation. During periods when full 208 volt, 3 phase power is in critically short supply, if the
air conditioner cannot be turned off completely, it shouId be operated in VENTILATE mode only.
2-25/(2-26 blank)
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