Lennox icomfort Wi-Fi - Max Defrost by Weather; Automatic Max Defrost Rule

iComfort Wi-Fi
®
7-Day Programmable Communicating Thermostat
Page 33
OFF time > 30 minutes
when
ambient temperature<35ºF
(See Note)
Next defrost cycle
should run MAX
regardless of the
heating time between
defrost
YES
Last heating time between
defrost <= 50 minutes
NO
Next defrost cycle
should run MAX
Last two heating time
between defrost > 1 hr
YES
NO
Next defrost cycle
should run 90ºF
termination
Next defrost cycle
should run the same
termination as
previous defrost
cycle
YES
NO
Defrost termination is set at
MAX
NOTE: Testing indicated
that the highest potential
for a weather event to
prevent fan operation due
to ice build up on the fan
blade and orifice ring is
when the outdoor ambient
is below 35ºF and the unit
is OFF for more than 30
minutes.
Figure 39. Automatic Max Defrost Rule
MAX DEFROST BY WEATHER
Factory default for this feature is disabled. When enabled Max
Defrost is always used if any of the following weather
conditions are reported via the Internet to the thermostat:
 Rain (light, medium or heavy) and outdoor temperature
temperature is reported as less than 35°F
 Sleet
 Freezing rain
Note: This setting when enabled is always used regardless of
day, night or thermostat termination temperature setting in a
total communicating system.
Example:
If the following conditions are true then the thermostat will
direct the outdoor unit control to operate the outdoor unit in
Max Defrost mode during this weather event.
 Defrost termination temperature is set at 50°F, 70°F or
90°F in a full communicating system;
 Any of the exampled weather conditions are forecast,