Kidde Fire Systems Surge Protector P/N 81-CO2MAN-001 Manuale Utente

September 2013

1-4

P/N 81-CO2MAN-001

as well as to warn personnel not to enter the protected space after a CO

2

 discharge until the 

area has been safely ventilated. See Paragraph 2-9.2 for specific sign and location information.
All personnel shall be informed that discharge of carbon dioxide gas directly at a person will 

endanger the person's safety by causing frostbite, eye injury, ear injury, or even falls due to 

loss of balance upon the impingement of the high-velocity discharging gas. All personnel shall 

be trained on the dangers associated with an increased carbon dioxide concentration, the 

proper manual and emergency operation of the system, and the appropriate response to pre-

discharge alarms.

1-6.1.3

PRE-DISCHARGE TIME DELAYS AND ALARMS
Time delay devices are designed to delay the discharge of carbon dioxide for an appropriate 

period of time to allow an orderly and safe evacuation from the protected area. Time delays 

also are used to provide a time interval for equipment shutdown and auxiliary interlocks prior 

to agent discharge.
Pneumatic discharge delays (See Paragraph 2-8.3) shall be provided for:
•

All total flooding carbon dioxide systems protecting normally occupied and occupiable 

enclosures

•

Local application systems protecting equipment or processes in normally occupied and 

occupiable areas, where the discharge will expose personnel to hazardous concentrations 

of carbon dioxide

An electric time delay may be employed in any circumstance that does not require a pneumatic 

discharge delay.
For occupiable spaces where a delayed discharge could result in an unacceptable risk to 

personnel or unacceptable damage to critical equipment, time delays need not be provided.
An evacuation dry run shall be conducted to determine the minimum time needed for a person 

to evacuate the protected area. Additional time shall be provided to allow for identification of 

the evacuation signal.
Pre-discharge alarms, whether electrical or pneumatic in nature, are designed to provide a 

warning and evacuation signal during the time delay period. Audible and visual indication shall 

be provided when the system is actuated by either automatic or normal manual operation.
Pneumatic pre-discharge alarms (See Paragraph 2-8.4) shall be provided for all applications 

that also require a pneumatic discharge delay, as listed above. Electric alarms may be 

employed in addition to pneumatic alarms or as the sole means of notification in applications 

that do not require a pneumatic discharge delay.

1-6.1.4

STOP VALVES AND LOCKOUT VALVES
A stop valve, when used as a safety device, is employed to ensure that carbon dioxide is not 

discharged into a normally occupied area without an evacuation signal. The valve is normally 

closed to prevent the flow of carbon dioxide into the distribution piping. Automatic or manual 

action is required to open the valve and allow CO

2

 to be discharged.

A lockout valve is a manually operated valve, installed in the distribution pipe, between the 

supply and nozzles. The valve is normally open, but shall be locked in a closed position to 

prevent discharge of agent into the protected space when:
•

persons not familiar with the system and its operation are present

•

persons are present in locations where discharge of the system will endanger them and 

where they will be unable to proceed to a safe location within the time delay period

A lockout valve shall be provided on all systems, except where dimensional constraints prevent 

personnel from entering the protected space and where discharged carbon dioxide cannot 

migrate to adjacent areas, creating a hazard to personnel. Lockout valves shall be supervised 

to provide notification of a lockout.