Varifan MST-2B, Installation Manual

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Page 13
2.6 ALARM
The MST-2B provides a normally open and normally
closed dry contact for alarming low or high temperature
conditions. In addition, that same contact may be used to
signal a power failure. This contact may be connected to
an alarm system, or directly to a siren and/or an auto-
dialer.
Make the normally open or normally closed connections as
shown in figure 2.
2.7 POWERING UP
Before powering up the MST-2B, attach the faceplate to
the casing of the MST-2B using the four screws previously
removed.
Set the selector knob to position (12).
Upon powering up, the unit will test its LED display by
lighting up all of its segments. Make sure all segments light
up at this moment.
Following the LED display test, the unit will display the
room temperature.
If the temperature is not displayed, refer to the
Troubleshooting section in the appendix of this manual.
Momentary power interruptions may trigger false alarms!
To avoid false alarming when the MST-2B is connected to
an alarm system, install a time delay relay between the
MST-2B and the alarm system.
CHAPTER 2 - INSTALLATION