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"CG3-UV" SERIES VENTILATOR PRINCIPLE OF OPERATION
INTERNAL FIRE MODE—For CG3-UV
and CG3-UV-FDT only!
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. When the temperature
of the conveying airstream, which must pass over the thermostats, reaches 250°F, the system is activated, and the
following occurs:
7. Then the digital display reads "Fire In Hood, Notify Fire
Department". This display stays on until the thermostat
cools down below 250°F.
7. A red light on the Command Center illuminates.
8. On the C-6000-UV control: dry contacts A1 & A2 will
CLOSE and dry contact Q1 & Q2 will OPEN.
9. Upon cooling of the thermostat below 250oF, the Cool Down
Cycle starts. The water continues to spray during the Cool
Down Cycle (2 minutes). The damper moves to the exhaust
position. (N/A on CG3-UV-FDT)
1. The damper begins closing back to the fire position,
position 3 as shown in Fig.4—stopping the combustionsupporting, natural draft through the ventilator and creating
a fire barrier to contain the fire in the kitchen. (N/A on CG3UV-FDT)
10.While in the cool down cycle the digital display reads "Cool
Down Cycle, xxx sec. to end". xxx is the countdown in
seconds until the wash turns off. The damper moves to the
exhaust position.
2. The UV lamps are shut off.
3. The exhaust fan serving the ventilator is shut off. The supply
fan is also shut off.
11.At the end of the cool down cycle the wash turns off and the
digital display reads "Fan Off 12:00 (actual time), Start
Fan>F1". The damper closes to the wash position. (N/A on
CG3-UV-FDT)
4. Fire-smothering water spray is released into the interior of
the ventilator through the spray nozzles.
5. The digital display reads "Fire In Hood, Fan Off, Wash On"
for approximately 5 seconds.
NOTE: The water may be shut off prior to the end of the 2 minute
cool down cycle by pushing the “Exit” button on the C-6000-UV
Command Center. After the water has shut off, the damper remains
in the wash position until the “Start Fan” button is pushed.
Starting the Exhaust Fan
6. Then the digital display reads "Fire In Hood, Damper
Closing" for approximately 5 seconds.
CAUTION:
In case of severe fire the thermostats located in the plenum will
activate. As a precautionary measure, it is recommended that
the thermostats be replaced.
WATER SUPPLY
FROM CONTROL
CABINET
FIRE QUENCHING
WATER SPRAY
WATER BARRIER
DAMPER CLOSED BACK TO
THE FIRE POSITION
DRAIN LINE
SURFACE FIRE
PROTECTION NOZZLE
(OPTIONAL)
FIG. 4
FIRE CYCLE
8