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Temperature Unit Change
The thermostat can display temperature in
either Fahrenheit or Celsius. To change the
temperature units, press and hold the knob
until the display changes (4 seconds). The
display will show the current temperature,
the set point temperature (if it was previously
displayed), and the temperature units options
with the currently selected units blinking.
Rotate the knob to change the selection.
Upon selecting units, the temperature(s)
displayed will update values accordingly.
Once the desired units are blinking, press the
knob to accept the changes.
Retained Settings
Some settings will be retained when power is
lost, or the thermostat is rebooted.
The retained settings include:
•
set points - Three set points are
retained: one for cool, one for heat,
elec (electric) heat and gas heat and
one for cool+heat.
•
temperature units.
Settings are stored automatically upon any
changes made to any set point or
temperature unit change.
HVAC Mode Descriptions
The table below describes which outputs are
live by the thermostat in the specified HVAC
mode.
HVAC
Live Outputs
Mode
HVAC outputs are disabled,
Off
fan is based on selection
Compressor and selected
Cool
fan speed
Elec Heat
Electric heat and gas heat
Gas Heat
Gas Heat
Heat
Cooling Cycle: Compressor
and selected fan speed
Cool+Heat
Heating Cycle: Electric heat
(when Dip switch 2 is on),
gas heat and Fan
While in cool+heat mode, a 15 minute timer
(auto change-over timer) will prevent the
opposite HVAC mode from operating if the
set temperature and room temperature
remain within 2° F. This timer is automatically
disabled upon changing the HVAC mode, fan
mode, or set point temperature.
Elec Heating Mode
When in elec heating (heat pump) mode
some extra rules are applied. If the elec
heating mode is selected and the current
temperature ever reaches 5° F below the set
point temperature, the gas heat mode will
turn on in conjunction with the elec heat.
When the gas heat must turn on to assist the
elec heat, the elec heat gets a strike. Once the
elec heat gets three strikes and that heating
cycle has completed, it is disabled for 1hr and
45 minutes. When the elec heat is disabled in
this way, the gas heat becomes the primary
source of heat. After 1 hr and 45 minutes, the
elec heat becomes the primary source again.
If the elec heat gets a strike but completes a
heating cycle without the assistance of the
gas heat, the elec heat will lose a strike. If the
elec heat is running for 20 minutes without
the gas heat needing to turn on, the strike
counter is reset. Whenever the gas heat is
running in this mode, the 'Elec' segment will
flash.
Compressor/Elec Heat Short Cycle Protection
(DOB)
To protect the compressor/heat pump from
short cycling, a 3 minute delay will be
initiated for both the compressor and elec
heat outputs after either output's demand is
satisfied. During this 3 minute delay, if there
is a demand for the compressor or elec heat,
the HVAC state segment will blink according
to the selected mode. Once the delay has
expired, the thermostat will resume normal
operation.
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