Determine The Cinema Projector Exhaust Cfm Value; Install The Primary Lens - Christie CP2220 User Manual

• At minimum, a 10" long, strong metal duct must be installed at the cinema projector to pre-
vent glass shards from exiting the duct in the event of a lamp explosion.

2.8.1 Determine the Cinema 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 cinema projector. Take the measurement at the very end of the duct without the cinema projector
connected. Use this formula to determine the CFM value for the cinema projector:
Measured linear ft/min x 0.35 = CFM
Table 2.1 Installation Requirement Calculations
Airflow
Temperature
(CFM)
450 25°C
CFM
600 GREATER THAN
CFM
AND BELOW
Add an extractor or a booster if there is insufficient airflow.
Do not mount the extractor on the cinema projector as this
may introduce some vibration into the image. NOTE: To
prevent the cinema 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.
with inadequate airflow can result in dangerous overheating of the cinema projector.
2.9

Install the Primary Lens

The lens seals the projection head, preventing contaminants from entering the main electronics area. Do not
operate the cinema projector without a lens installed. Install a lens plug when you install or transport the
cinema projector.
1. Verify the rear safety strap or rear hold down bracket is installed.
CP2220 User Manual
020-100420-08 Rev.1 (5-2014)
Altitude (above sea
level)
OR LOWER AT OR BELOW
25°C
AT OR BELOW
35°C
FEET
Never disable the vane switch. Attempting to operate the cinema projector
3000
FEET
10 000
Section 2: Installation and Setup
Vane Switch
Top View into
Exhaust Duct
2-7