TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
Page 19
Example Settings For HYS And db
HYS db Turn-On (Above SP) Turn-Off (Below SP)
Standard 4 -3 1 3
5-3 2 3
5-1 4 1
No Good 3 0 3 0
Chambers are shipped with HYS = 4, and db = - 3, as shown on the top line in the above examples. It is
unlikely a change to these settings will be required. Fortunately, these settings are not subject to “cold start”
default, and will remain valid after a power interruption. They are held in EEROM, not battery-backed RAM.
7.3 Watlow F4 Control Functions (Alternate Controller): The Main Power switch 1SS must be turned
ON to enable the conditioning control circuitry. 1SS will also turn on the chamber conditioner fan.
- HEAT CONTROL -
Output 1A - - This time proportioned output will trigger triac 1TRC to conduct and provide power to the
electric heaters.
- COOLING CONTROL -
Dig. Out #8 - - This digital On/Off output will energize solid state relay SSRx and a control relay, which
triggers triac 2TRC to conduct and provide power to the entire refrigeration system. The
high stage compressor will immediately start. The low stage compressor will start after a
slight delay from the Low Pressure Cut-In Switch PS2.
Note: Digital Output No. 8 serves as a Compressor Control output, which can save wear
on a compressor and prevent it from locking up from short cycling. Compressor On %
Power sets the power level that will switch this output (compressor & control circuitry) on.
Compressor Off % Power sets the power level that will switch the compressor off.
The compressor(s) will not turn on until the output power exceeds the Compressor On %
Power for a time longer than the Compressor On Delay. The compressor will not turn off
until the output power exceeds the Compressor Off % Power for a time longer than the
Compressor Off Delay.
To Clear an Alarm or Error:
In an alarm condition, an alarm message will appear on the Main Page (if this option has been selected on
the Setup Page). To silence it, move the cursor to the alarm message and press the Right Key >. A pop-up
message will confirm the silencing of the alarm, and the indicator light will go off.
When the condition causing the error or alarm is corrected, return to the error or alarm message on the Main
Page, and press the Right Key again. A pop-up message confirms the alarm is unlatched.
Cascade Temperature Control (Optional):
Note: Tenney chambers are set up to run in the “No Cascade” mode because of the many variations in
customer products that require special tuning with this option.
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