8 Technical Bulletin—TC-9100 Universal Controller
The TC-9100 Universal Controller may be configured to set any of the
analog outputs to the maximum level, or switch any of the digital outputs
on, when a low level in an analog input is sensed. This feature is normally
used for low-limit temperature or anti-freeze protection in rooms by
switching on heating devices. The Low Limit mode overrides the OFF
mode of the controller and the manual override of the 3-speed fan
outputs.
Note: As the Low Limit mode is dependent on application and
configuration, the equipment installer is responsible for ensuring
that appropriate additional anti-freeze devices have been installed
to cover all possible low temperature situations which may cause
equipment damage.
For further details, refer to the Low Limit Module Configuration section
of this document.
The working set points in the TC-9100 Universal Controller may be
increased in summer and decreased in winter to provide additional energy
savings when it is possible and appropriate to modify comfort conditions
in the controlled space.
Alternatively, in winter, the set points may be increased to offset the
effect of “cold radiation” from external wall surfaces.
For further details, refer to the Summer/Winter Compensation Module
Configuration section of this document.
The TC-9100 Universal Controller may signal to a supervisory system
that any one or more of the following off-normal conditions has occurred:
• Analog Input High or Low Limit alarm
• Window open
• General alarm
• Low Limit (Anti-freeze) mode is active.
This signal may be used to initiate further actions, such as an automatic
dial connection to a remote monitoring system. The N2 Dial Module
(NDM101) within the Metasys System provides this function. For further
details, refer to the section of this document titled Auto-dial Feature.
Low Limit
(Anti-freeze)
Mode
Summer/Winter
Compensation
Auto-dial Mode
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