Ecobee 3 lite Technical Manual - page 3
| 250 University Ave | Suite 400 | Toronto, Ontario | M5H 3E5
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Specifications
Temperature ranges
Heat: 45 – 79°F (7 – 26°C)
Cool: 58 – 92°F (14 – 33°C)
Display: 40 – 100°F (5 – 37°C)
Sensitivity: +/- 1°F (0.5°C)
Equipment Interface Operating: -40o to 160oF (-40o
to 70oC)
Thermostat Operating: 32o to 130oF (0o to 55oC)
Humidity Range
Humidify: 20 to 50% R.H
Dehumidify: 30 to 60% R.H
Display: 0 - 90% R.H
Sensitivity: +/- 2% R.H.
Operating: 5 – 95% R.H non-condensing
Dimensions
Thermostat: 5.5”W x 3.25”H x 1”D (139.5mm H x
82.5mm W x 25mm D)
Equipment Interface: 4.6”W x 10”H x 1.3”D (118mm
W x 254mm H x 32mm D)
Power
AC Transformer - 24 VAC - 3VA Minimum (not included)
Battery – CR2032 – 3V lithium coin cell (included)
Wiring Specifications
Refer to this table to determine maximum wire lengths
allowed:
Smart Thermostat to Equipment Interface
18 AWG 20 AWG 22 AWG
1250ft/380m 790ft/240m 500ft/150m
Equipment Interface to heating/air equipment
18 AWG 20 AWG 22 AWG
128ft/39m 80ft/24m 50ft/15m
Configuring the
Smart Thermostat
Configuring the Installer Settings
Installer Settings let you configure the settings related
to the various devices (such as a furnace, air
conditioner, humidifier, dehumidifier or ventilator) that
are connected to the Equipment Interface.
To prevent accidental modifications to these settings
you can enable a 4-digit installer code. This code is
pre-programmed to 3262 and can be enabled in the
Thresholds option menu.
Installation Wizard
The Installation Wizard takes you step-by-step
through a series of choices regarding the HVAC
equipment intended to be connected to the Equipment
Interface.
Simply answer the questions accordingly and press
Next to advance to the next screen. Once completed
you will be shown a diagram of the wiring connections
that reflects the choices made during the wizard
process. You can press Back to go back and make
any changes. Once you are satisfied with the setup,
press Done.
Equipment
The equipment setting will allow you to manually
configure the various devices that are connected to
the Equipment Interface.
Heat Pump
This section allows you to enable and configure up to
a 2 stage heat pump. If a second stage is required
you must configure an Accessory relay to control that
stage Geothermal/Ground Source Heat pump If you
select Yes, this tells the system a geothermal or
ground source heat pump is being controlled. This
helps the Thermostat determine optimum
performance and default settings.
If you select NO, the system will optimize for an air-to-
air heat pump. O/B Energize on Cool If you choose
Yes, the reversing valve output (O/B terminal) will
activate when there is a call for cooling. If you select
No, the relay will energize when there is call for heat
Min Cycle Off Time
Enables you to configure the
compressor off time between cycles. This is
adjustable from 240 - 900 Seconds.
Min Outdoor Temp
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.
Allow Heat Pump/Auxiliary Heat to Run
Simultaneously
If you select Yes and there is a source of auxiliary
heat, it will turn on in addition to the heat pump. The
heat pump will be energized for the first 30 minutes.
If, after 30 minutes, the set point has not been met,
the auxiliary heat will be energized to assist the heat
pump in meeting the load.If you select no, the heat
pump will be energized for up to 2 hours.