Connect External Exhaust Ducting; Determine The Projector Exhaust Cfm Value - Christie CP2220 User Manual

Section 2: Installation and Setup
2.8

Connect External Exhaust Ducting

Connect the ductwork that vents outside to the 8 inch diameter exhaust
port on the top of the projector. Confirm that there are no obstructions
or bends in the ducting, all air intakes are free of obstructions, and the
vane switch at the exit duct moves freely.
The pre-installed outside-venting duct should be rigid at the projector
and must also include a heat extractor and blower that maintains a
minimum of 450 CFM* when the projector is operating at less than or
equal to 25°C ambient and less than 3,000 feet, while measured at the
projector exhaust opening.
WARNING
• *600 CFM is required in projection rooms with an ambient
temperature above 25°C or located at an elevation
greater than 3000 feet above sea level.
• At minimum, a 10" long, strong metal duct must be
installed at the projector to prevent glass shards from
exiting the duct in the event of a lamp explosion.

2.8.1 Determine the Projector Exhaust CFM Value

Use an airflow meter to measure the ft/min or ft/sec at the rigid end of the open exhaust duct that connects to
the projector. Take the measurement at the very end of the duct without the projector connected. Use this
formula to determine the CFM value for the projector:
Measured linear ft/min x 0.35 = CFM
Table 2.1 Installation Requirement Calculations
Airflow
Temperature
(CFM)
450 CFM 25°C or lower
600 CFM
greater than
and below 35°C
Add an extractor or a booster if there is insufficient airflow.
Do not mount the extractor on the projector as this may
introduce some vibration into the image. NOTE: To prevent
the projector from overheating or becoming unsafe, an alarm
sounds if the duct is obstructed or a fan fails. It is
recommended that you regularly verify that the exhaust is
functioning correctly.
Attempting to operate the projector with inade-
quate airflow can result in dangerous overheating of the projector.
2-8
Altitude (above sea
level)
at or below 3000 feet
25°C at or below 10 000
feet
Never disable the vane switch.
Figure 2-6 Connect Exhaust
Ducting
Figure 2-7 Exhaust Duct Vane Switch
Exhaust
Duct to
Outside
450 cfm
required*
Vane Switch
Top View into
Exhaust Duct
CP2220 User Manual
020-100420-07 Rev.1 (1-2012)