Heat Stages Allows you to congure up to 3 stages of
heat. If you require a third stage, you must congure
an accessory relay to control that stage.
Heat Fan Control This option allows you to determine
if the system fan is controlled by the system during
heat cycles, or if the Thermostat is required to control
the fan. Normally the HVAC system controls the fan
during heat cycles.
Air Conditioner
Allows you to enable and congure up to 2 stages of air
conditioning. If you require a second stage, you must
congure an accessory relay to control that stage.
Staging Method of Operation
The ecobee Thermostat uses a unique method for staging
for multi-stage heating or cooling. It uses a combination of
intelligent algorithms and past performance to determine
when to activate the stages. When there is a call for heat or
cool, the system computes how long it would take for the
system to reach the desired set point in stage 1, stage 2 or
stage 3 accordingly. It will determine that highest stage at
which a minimum of 10 minutes of run time is required. It
will then automatically start the system at that stage (ie if
it calculates that it will take 15 minutes at stage 2 but only
7 minutes at stage 3, the system will immediately turn on
stage 2 to meet the set point). If the calculation indicates
to start at stage 1, and it takes more than 10 minutes to
reach the set point, it will automatically engage stage 2.
If stage 2 runs for more than 10 minute without reaching
the set point it will activate stage 3. A minimum run time
of 10 minutes is used to ensure that proper circulation
throughout the system and that minimum cycle times
are maintained. For heat pumps with auxiliary heat,
the operation of the auxiliary heat will depend on the
conguration of the Allow Heat Pump/Auxiliary Heat to Run
Simultaneously on page 22.
Accessory relays
Accessory relays are generic relays that can be congured
to control the following;
Heat Stage 3 Select this option when the Thermostat
is required to control a 3-stage conventional heating
system. Connect the third stage (or W3) contact to this
accessory relay.
23 System Set-Up
Auxiliary Heat Stage 2 Select this option when the
Thermostat is required to control a heat pump system
with 2 stages of Auxiliary heat. Connect the second
stage of the auxiliary heat to this relay.
Compressor/AC Stage 2 Select this option when the
Thermostat is required to control either a 2-stage heat
pump or a 2-stage air conditioner. Connect the Y2
terminal of the system to this relay.
Humidier Select this option when the Thermostat
is required to control a humidier. When this option is
selected you will also be able to congure the following:
Humidify only while heating If Yes is chosen, the
system will activate this relay when the current
humidity is below the humidity set point and there
is a call for heat.
If No is chosen the system will activate this relay and
the system fan when the current humidity is below
the humidity set point. This is designed to support
steam type humidiers
Window Eciency To optimize the frost control
feature of this system (see page 45), the system needs
to know the eciency ratio of the windows within
the area being controlled by this system. Options are
Low, Medium and High.
Dehumidier On a call for cool, if the current humidity
is above the set point, this relay will be activated. When
this option is selected you will also be able to congure if
you wish to enable the fan during the dehumidication
cycle. Choose yes if you are using the air conditioning
system to dehumidify, choose No if you are using a
standalone dehumidication system that independently
controls the system fan.
Ventilator Activated when the user engages Ventilator
Max from the Details screen. The system fan will also
turn on when Ventilator Max is engaged
System Set-Up 24
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