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1.3
Cooling
1.3.1 Light Engine Area Cooling (Front of Projector)
• Primary Air Intake (Fans 5,6,7,8): The four intake fans, located on the right-hand side of the projector
pull air through the high-efficiency filter before flowing across the critical components in the light engine
area.
• Cardcage (Fan 1,2 exhaust) (Fan 9,10 intake): The cardcage is outfitted with two exhaust fans at the
bottom and two additional intake fans at the top.
• Laminar Airflow Device (Fan 4): Mounted to the light engine handle, the Laminar Airflow Device
(LAD) fan is mounted with its own filter and is responsible for circulating a separate supply of dust-free
laminar (low-turbulence) airflow via tubing routed to each DMD aperture. The LAD air is drawn from the
filtered air in the light engine area, thus it is double-filtered for use at the DMDs.
• Liquid Cooling: The liquid cooling system is the primary method for cooling the light engine DMDs. This
system consists of small copper water blocks screwed to the three DMD mounting studs and daisy-chained
together with PVC flexible tubing. Both ends of the chain connect to quick disconnect couplings located
on the firewall between the IOS and light engine compartments, forming the cool "source" and warm
"return" lines with the liquid cooler heat exchanger and pump. This liquid cooling loop circulates Christie
approved coolant - JEFFCOOL E105. The level of fluid in the reservoir can only be seen if the projector
top lid is opened.
1.3.2 Lamp Area (Rear of Projector)
NOTICE! *600 CFM is required in projection rooms with ambient temperatures above 25°C or
elevations (above sea level) greater than 3000 feet.
The lamp and its dual reflectors, both located in the segregated lamp compartment, are the primary heat
sources for the projector. Cooling for these components originates from a high-efficiency lamp blower. Its
large output duct directs air axially along the lamp and between the rear reflector and its similarly shaped heat
shield. As part of this system, an external heat extraction fan must be added to generate and maintain the
required minimum airflow of 450 CFM* at the exhaust opening located at the top of the projection head. This
exhaust must vent to the outside of the building at every site. Two vane switches - one at the blower intake and
one at the exhaust opening monitor airflow, providing interlocks for safe operation of the projector. If a switch
opens due to inadequate airflow, the lamp will shut OFF and a red alarm window will appear on the TPC.
NOTE: Cooling in the rear of the projection head does not require filtered air.
3kW Lamp Power Supply (LPS) and Low Voltage Power Supply (LVPS)
The power supplies each provide their own cooling. The lamp power supply is cooled by two internal field
replaceable fans. Airflow from this device is ducted out of the enclosure. All diagnostics are routed back to the
PIB3G through RS232 communications. The LVPS also has a small fan on one end for self cooling.
D4K25 Service Manual
020-100880-01 Rev. 1 (06-2012)
Section 1: Introduction
1-3
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