TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
Page 33
Note: Refer to the Installation Instructions Section for supply and connection type specifications.
Warning! Carbon Dioxide gas displaces oxygen. Make sure the area surrounding the chamber is
well ventilated to dilute the gas vented from the chamber vent port checkvalve!
General Description:
The CO2 Boost Cooling System option may be provided to increase the rate of cooling beyond the means of
the refrigeration system. Boost cooling is achieved by injecting liquid carbon dioxide into the chamber
through an orifice within an injection port. There is no flow adjustment valve for the supply. CO2 has a boiling
point of -78.5 degrees Celsius (-109.3 deg. F). As the liquid sprays out of the orifice, it immediately vaporizes
and absorbs chamber heat while it mixes with process air.
Operation:
The system is activated by an event output from the main controller (or by a manual switch). To use the
system, the Event must be turned ON. Reference the Event Label on the side of the chamber or your Test
Report for the Event Number assigned to this feature.
Once the system is enabled with the event output, the controller's time proportioned Full Cooling output will
energize a solid state On-delay timer. If the Full Cooling output remains on longer than ten seconds, the
timer will time out and energize the CO2 Injection solenoid valve SOL. This valve will open to permit the flow
of CO2 into the chamber to boost the cooling rate. As soon as the Full Cooling output turns off, the timer
output will open to deenergize SOL and shut off the flow of CO2.
Note: Your equipment configuration may be slightly different from
what is shown.
16.0 CO2 BOOST COOLING SYSTEM (Optional)
CO2 Boost Cooling
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