If the Y1, W1, or W2 (W2 in electric heat systems only) outputs are energized
when the mode is set to HEAT, EHEAT, or AUTO, operating in Heat, then the
heating equipment is on. When all of these outputs are off, the heating
equipment is off.
Inputs
Power supply
Class II transformer secondary voltage supplied to the thermostat is 18.0 to 30.0 Vac, 50/60 Hz. Voltage is
applied between R and C connector.
Space air temperature
The space air temperature measurement is supplied by an NTC "J" curve (type II) thermistor. The resistance of the
thermistor is 10K ohm nominal at +25°C with an accuracy of ±0.20°C from +15.6°C to +32.2°C (approximately
0.5°F accuracy from 60°F to 90°F).
If the thermistor reading is invalid, the space temperature is measured by the Sensirion SHT21 humidity and
temperature sensor.
Remote temperature sensor
The remote temperature measurement is supplied by a NTC "J" curve (type II) thermistor connected between T and
C. This thermistor is supplied by the installer to use for Space, Outdoor, Supply Air, or an average with the space
air temperature. When used for the space temperature sensor, up to 9 remote space sensors can be averaged (1,
or multiples of 4, or 9). The T input allows for remote occupancy override with T55 style sensor.
• If the Occupancy Input installer setting is set to OCCUPIED, when a short in the circuit from 2 up to 5 seconds
in duration is sensed, a change is made from the unoccupied heating and cooling setpoints to the occupied
heating and cooling setpoints for the current time period, for the configured allowable time.
• If the Occupancy Input installer setting is set to UNOCCUPIED, when a short in the circuits sensed for more
than 2 seconds, the occupied heating and cooling setpoints change to the unoccupied heating and cooling
setpoints for the current time period.
• Alternatively, you can use the remote temperature sensor input as a remote occupied/unoccupied selection
as well as an indicator of economizer fault or Filter Reminder.
• Alternatively, Wi-Fi outdoor temperature is available by GPS location services – determined when the
thermostat is installed and registered through a Wi-Fi connection.
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