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25
compressor from running when the outdoor temperature is
too low, thus resulting in damage to the compressor.
You can also set this value to determine when you want the
auxiliary heat (if installed) to engage to help meet the set
temperature. The temperature range is adjustable from 0 to
65 °F (–17.8 to 18.3 °C) or can be completely disabled.
Note: You need an Internet connection for this feature to
operate properly.
Aux Heat Simultaneous Operation: If you select Enable and
there is a source of auxiliary heat, it will turn on in addition to
the heat pump. The heat pump will be engaged for the first
30 minutes. If, after 30 minutes, the set point has not been
met, the auxiliary heat will also be engaged to assist the
heat pump in reaching the set point.
If you select Disable, the heat pump will be engaged for up
to 2 hours. If after 2 hours the set point has not been met, the
thermostat will shutdown the heat pump and engage the
auxiliary heat to reach the set point. This option should also
be used for installation where the heat pump evaporator
coil is downstream from the source of auxiliary heat.
This setting is only available when the Comp to Aux Temp
Delta and Comp to Aux Runtime settings are both set to
Auto (default).
On Thermostat:
1. Select Main Menu > Settings > Installation Settings >
Equipment > Heat Pump.
2. Configure the settings as required.
Furnace
This menu lets you configure up to a 2-stage conventional heat
source. If you have selected a heat pump as your primary
source, this feature allows you to configure the 1st stage of
auxiliary heat connected to the system.
Type: Configured during initial setup (page 4), this optimizes
the system for either a conventional furnace or a boiler.
Fan control in Heat mode: Configures the furnace fan to be
controlled by the ecobee3 or the HVAC system during heat
cycles. Normally the HVAC system controls the fan during
heat cycles.
On Thermostat:
1. Select Main Menu > Settings > Installation Settings >
Equipment > Furnace.
2. Configure the settings as required.
Humidifier
This menu lets you configure a humidifier accessory.
Type: Optimizes the humidifier operation for either
Evaporative or Steam humidification.
Humidify only while heating: Select Yes for the humidifier to
only operate when there is a call for heat. If you want the
humidifier to function at other times, select No.
Min Run Time Delta: Reduces short cycling by running the
humidifier beyond the set point by the selected amount (2%
to 10%).
Window Efficiency: The humidifier frost control setting uses
this efficiency rating to compute the humidity set point
within the range of 15% to 50%. Values are from 1 to 7, with 7
being for the most efficient windows possible.
On Thermostat:
1. Select Main Menu > Settings > Installation Settings >
Equipment > Humidifier.
2. Configure the settings as required.
Dehumidifier
This menu lets you configure a dehumidifier accessory.
Dehumidify with fan: Run dehumidifier when fan is running.
Min Run time delta: Reduces short cycling by running the
humidifier beyond the set point by the selected amount (2%
to 10%).
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