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OUTDOOR TEMPERATURE SENSOR (INCLUDED)
Outdoor temperature can be measured by attaching the included 8052 sensor to the T1 and T2
terminals The outdoor sensor must be enabled in the installer setup menu
Heat pump models can use the outdoor temperature to effectively utilize the heat pump:
• When the outdoor temperature is lower than the Low Balance Point, the heat pump will be
locked out and only auxiliary heating will be used to provide heating
• When the outdoor temperature is higher than the High Balance Point, the auxiliary heating will
be locked out and only the heat pump will be used to provide heating
Indoor Air Quality functions can use the outdoor temperature sensor to:
• Control humidification set point based on outdoor temperature to prevent condensation.
• Lock out ventilation based on high and/or low outdoor temperatures
• Display outdoor temperature on thermostat
Outdoor temperature sensor should be mounted:
• On side of building out of direct sunlight (north side recommended)
• Above snow line
• At least 3 feet away from exhaust vents and condensing lines
• Using less than 300 feet of wire
• Do not route wires along 120 VAC lines
4
FIGURE 1 – OUTDOOR TEMPERATURE SENSOR WIRING
RH
RC
W
Y
G
C
O/B
L
W2
Y2
T2
T1
I2
I1
90-2561
5
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