Ecobee SMART, Installation Manual, Page: 14 / 20

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.
Humidifier Select this option when the Thermostat
is required to control a humidifier. When this option is
selected you will also be able to configure 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 humidifiers
Window Efficiency To optimize the frost control
feature of this system the system needs to know the
efficiency ratio of the windows within the area being
controlled. Options are Low, Medium and High.
NEW
Min Runtime Delta
Determines how far from
the set point, the system will maintain to reduce short
cycling of the equipment.
Dehumidifier 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
configure if you wish to enable the fan during the
dehumidification cycle. Choose yes if you are using
the air conditioning system to dehumidify, choose No
if you are using a standalone dehumidification system
that independently controls the system fan.
NEW
Min Runtime Delta Determines how far from
the set point, the system will maintain to reduce short
cycling of the equipment.
NEW
Dehumidify in Heat Mode Allows you to
control the dehumidification even when the system
is in heat mode.
23 Configuring The Smart Thermostat
NEW
Dehumidifier Active Allow you to configure if
the active stat of this relay is open or closed.
Ventilator Activated when the user engages Ventilator
Max from the Details screen. The system fan will also
turn on when Ventilator Max is engaged
Thresholds
This section will allow you to configure the various
temperature or time thresholds associated with the
heating and cooling equipment. You must configure the
required equipment first before setting the thresholds,
and only the application thresholds will be shown (i.e.
if no air conditioner is configured, you will not see the
options related to air conditioners).
Allow Auto Heat/Cool
Enable this option to allow the user to select auto
change-over as a system mode.
Heat/Cool Min Delta
The minimum difference between the heat mode set
temperature and the cool mode set temperature when
the system mode is in auto change-over.
Compressor Settings
Min Cycle Off Time Allows you to configure the
compressor off time between cycles. This ensures the
compressor does not short cycle which could affect
the operating life of the system. This is adjustable
from 240 - 900 seconds.
Min Outdoor Temp
This section allows you to set
the minimum outside air temperature at which the
compressor will be disabled. This performs two
functions: You can set it to prevent the compressor
from going on 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°F (-17.8°C) - 65°F (18.3°C) or can
be completely disabled. You will need an internet
connection for this feature to operate properly.
Configuring The Smart Thermostat 24