50
Communicating Furnace
INTEGRATED FURNACE CONTROL
AUXILIARY INPUTS
17. AUXILIARY INPUTS (COMMUNICATING SYSTEMS
ONLY) (T5) (SEE FIGURE 35)
Terminal T5 is porovided for field installation of up to
two auxiliary switches. The auxiliary inputs shall be
used to provide a means of using traditional drain pan
switches, smoke detectors, freeze switches, etc. The
inputs are to be labeled
Aux 1
and
Aux 2
. The switch
inputs are for communicating systems only. One or
both inputs can be configured at the communicating
thermostat as either normally-opened or normally
closed contacts. System operation when the contacts
either open or close can be configured at the commu-
nicating thermostat.
A resistance of greater than 1k ohms to common shall
be detected as an open switch and a resistance of
less than 100 ohms shall be recognized as a closed
switch.
FIGURE 35
WIRING OF AUXILIARY INPUTS (USE WITH COMMUNICATING SYSTEMS ONLY).
ST-A1194-63 (TOP)
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