Quantcast Carbon Dioxide Systems and Halon Systems-Cont.

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(2) All doors and any required dampers to the protected area
must close, prior to start of agent discharge.
(3) A red flashing light in the protected area must activate.
(4) A time delay relay (set at minimum 15 seconds) shall start,
at the end of which:
(a) Discharge will occur in area or zone where alarm
initiated.
(b) Tech power in the affected area or zone must shut down.
(c) A visual indicator (i.e., sign with lit face or
flashing light above) outside the entrances to the area or zone must activate,
indicating that re-entry is prohibited.
c. On cross-zoned systems, consider using ionization smoke detectors
on one zone and photoelectric detectors on the other zone for maximum range of
fire detection capabilities.
d. Upon actuation of a manual station, all functions of the
pre-discharge mode and the discharge mode shall occur, including time delayed
discharge.
e. All Manual stations shall be distinct (i.e., signs, different
color) from manual alarm stations and stations for other extinguishing systems.
f. No new hosereels shall be installed in any buildings, except by
direction of Code 4042.
3. On Air Force projects only, positive hand pressure abort switch can be
provided and shall be located within the protected area, No abort switch will
be included in Navy projects unless specifically directed by NORTHNAVFACENGCOM
Code 4042.
4. Halon or CO2 systems are not substitutes for required sprinkler
protection in accordance with DOD criteria. Do not omit or delete required
sprinkler protection from any electronics facility unless a waiver has been
obtained by or through NORTHNAVFACENGCOM Code 4042.
5. Self contained breathing apparatus shall be provided outside all rooms
protected by total flooding Carbon Dioxide (CO2) or Halon.
6. Ensure spaces protected by gaseous extinguishing systems are tightly
sealed to prevent leakage. Construction joints must be caulked. Pipe and
conduit penetrations must be sealed. In total flooded rooms, doors must have
sweeps and weatherstripping and ceiling tiles must be clipped down. Show
these types of precautions on drawings appropriate for each trade.
7. Provide a permanent means of forced ventilation to remove the
discharged agent directly to the atmosphere.
5
Attachment 21.A
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