Internal Fire Mode - GAYLORD CG3-UVi-SPC Series Technical Manual

Chapter 2 - Principle of Operation, Page 2-14_________________________________________________

Internal Fire Mode

Important Note: The following description of the Internal Fire Mode is for the standard CG3-UVi-SPC
series Ventilator only. Refer to Table T-2-15-1 for a description of the Internal Fire Mode for series FDL,
FDT, FDD, and ND. Refer to Pages 1-6 and 1-7 for an explanation of fire damper options.
Automatic internal fire protection is accomplished by the action of the thermostat(s), which are located
at the point where the ductwork joins the ventilator (Refer to Figure 2-15-1). When the temperature of
the conveying airstream, which must pass over the thermostats, reaches 250°F, the system is activated,
and the following occurs:
1. Baffle #1 begins closing back to the fire position, position #3, stopping the combustion supporting
natural draft through the ventilator and creating a fire barrier to contain the fire in the kitchen (Refer
to Figure 2-8-1).
2. The UV lamps shut off.
3. The ESP Cells are shut off.
4. The exhaust fan serving the Ventilator is shut off. The supply fan is also shut off.
5. A fire signal is sent from the Command Center to the building fire alarm system (if wired).
6. The display on the Command Center will indicate a fire. Important Note: Refer to your Command
Center Technical Manual for specific text displayed during an Internal Fire Mode.
7. Upon cooling of the thermostat below 250°F, a 2 minute Cool Down Cycle begins and Baffle #1
moves to the exhaust position. Important Note: Refer to your Command Center Technical Manual
for specific text displayed during a Cool Down Cycle.
8. At the end of the Cool Down Cycle the damper closes to the wash position. Important Note: Refer to
your Command Center Tech Manual for specific text displayed upon completion of a Cool Down
Cycle.
9. The exhaust fan can now be restarted.
Important Note: The water sprays do not come on during an Internal Fire Mode