Cyclone User Manual
50
Positive Pressure Fan Control Option
When the Positive Pressure (51.PP) option is ordered, the enclosure fan function is changed.
•
Normally the enclosure fan(s) will run only when either the projector/luminaire lamp is on, or if the daytime
temperature in the enclosure exceeds the DEC Upper Temperature setting. At all other times the fan is OFF.
•
With the Positive Pressure option, when the fan would normally be off, it is instead powered via a capacitor that lowers
the operating voltage so that the fan continues to run at a low level, maintaining positive pressure in the enclosure and
preventing harmful contaminants from entering through the exhaust path.
Fan Control Board Capacitor Fan
HI Live terminal ON
when:
a)
Lamp is ON, OR
b)
Temperature is
above Upper
Temp Setting
LO Live terminal ON
when:
c)
Lamp is OFF, AND
d)
Temperature is
below Upper
Temp Setting
