User's Manual

Design
September 2013 3-56 P/N 81-CO2MAN-001
actuated simultaneously, the compensation for Uncloseable Openings and/or Forced
Ventilation need not be added to both systems.
3-10.3 Common Applications
Common applications that require an extended discharge include:
• Commercial/industrial food processing deep-fat (hot oil) cookers
• Enclosed rotating electrical equipment, such as emergency generators
3-10.3.1 DEEP-FAT COOKERS
For deep-fat cookers, the duration of protection shall be sufficient to allow the oil to cool a
minimum of 60°F (33°C) below its auto-ignition temperature. In cases where a local
application design is used, the minimum liquid discharge time shall be 3 minutes. However,
tests have shown that longer discharges may be necessary to allow sufficient cooling of the oil.
Several safety devices must be employed to protect personnel from the carbon dioxide
discharge, splashed hot oil, fire, and products of combustion.
The NFPA 12 standard and Kidde Fire Systems shall be consulted before protecting deep-fat
cookers.
3-10.3.2 ENCLOSED ROTATING ELECTRICAL EQUIPMENT
For Enclosed Rotating Electrical Equipment, the NFPA 12 Standard requires that a minimum
concentration of 30% shall be maintained for the duration of the deceleration period and for
not less than 20 minutes.
3-10.3.2.1 Recirculating Ventilation
For enclosed, recirculating-type ventilation, NFPA 12 provides tables that can be used as a
guide to estimate the carbon dioxide quantity needed for the extended discharge to maintain
a minimum concentration of 30% during the deceleration time. The quantity is based on the
deceleration time and the internal volume of the machine, assuming average leakage.
3-10.3.2.2 Dampered, Non-Recirculating Ventilation
For dampered, non-recirculating-type ventilation, the extended discharge quantity is
calculated by added 35% more agent to the indicated quantity for recirculating-type
ventilation. Reference NFPA 12 for additional information.