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Chapter 2: Installation
Figure 7: Multiple normally closed sensors
To wire several normally open sensors to one alert input, connect them in parallel. To do
this, take one lead from each sensor and attach it to the input terminal screw. Then, take the
second lead from each sensor and attach each to a COMMON screw. See Figure 8.
Multiple N.O. inputs are typically TEMP°ALERTs to monitor the temperature in several
different locations simultaneously.
Figure 8: Multiple normally open sensors wired in parallel
AUXILIARY TEMPERATURE / ALERT INPUT 4
The auxiliary terminal, marked AUX TEMP (screw #12) on the terminal strip, is a dual
purpose terminal. It can function as either a status-only temperature input, or as a fourth dry
contact input. If the AUX TEMP input is used as a temperature input, it is only used in a
status report and WILL NOT initiate a dial out process. If the AUX TEMP input is used as a
fourth dry contact input, it WILL initiate a dial out process.
To use the terminal as a status-only temperature input, wire one lead of the remote
temperature sensor (FGD-0005) to the AUX TEMP screw and the other lead to a
COMMON. If you use the terminal with a remote temperature sensor, you cannot attach a
dry contact sensor.
To use the AUX TEMP terminal as a fourth dry contact input, wire any N.O. or N.C. dry
contact sensor to it as described in the previous "Alert Inputs" section. The Model 4100 will
adapt to N.O. or N.C. sensors when the unit ID number is programmed. The unit will dial-
out with the message "Alert condition four exists." If you use the terminal as a fourth dry
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