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Table 6. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Low Balance Point
Setting used to prevent the heat pump from heating the structure. (Alert 18 - Minor - Notification only - The outdoor temperature is below the level where the heat pump is
programmed to heat the home).
Range is -20 to 72°F (-28.89 to 22.22°C). Default is 25°F (-3.89°C). Adjustments are in increments of 1°F (0.56°C).
NOTE:
Dual-Fuel Applications (Communicating Systems Only) - Dual fuel applications, which include both a Heat Pump and a gas furnace, will provide multiple stages
of heating. For example, a two−stage heat pump would deliver two stages of heat. The gas furnace can add two to four more
stages of heat.
CFA Cooling
Discomfort
Threshold
Default is ON. The purpose of this algorithm when set to ON is to detect systems with faults which are causing measurable loss of comfort and thus, need repair/service
intervention.
The algorithm monitors the duration in which the indoor temperature is above the cool set point or below the heat set point and does not approach the set-point. When an
issue is detected alarm 901 is activated.
Cooling Capacity
Alert
Options are ON or OFF. Default is ON. Cooling operation may not be sufficient for the hottest days. Based on local conditions and climatological data for zip code.
Examples: Dirty Filter, Low Freon charge, TXV, etc. Symptom during mild temperatures may include; system running longer than normal but not showing any other
symptoms.
Cooling Mode
Options are Normal and Comfort. Default is Normal. When changing to Comfort Mode, several parameters are automatically modified for optimal system operations. The
changed parameters are listed on the screen when set to Comfort.
•
Normal - This setting cools the home to the desired temperature setting. Once second-stage is activated by timer or differential, it will not stage down to first-stage until
the next cooling cycle demand.
• Comfort - This is when the system could automatically stage up or down based on the current load demand.
Cooling
Prognostics
This algorithm will determine whether the unit will run out of capacity during the hottest time of summer. It will look back everyday a minimum of three days to see if there
is a pattern and compare it to the hottest day on record for that zip code before triggering an notification. It must see a pattern before it will trigger the notification. There
may be a component or components that will require attention.
The sensitivity (threshold) selection options are
OFF
,
LOW
,
MEDIUM
, and
HIGH
. The default is
HIGH
. The alert code notification is 65545.
DAT Integral
Gain
(Lennox Variable
Capacity Outdoor
Units)
The indicates how stable the system is attempting to reach the discharge air temperature set point. You may hear the compressor hunting (ramping up and down)
adjusting to lower setting will correct.
Lennox advises not to make changes to this setting without first contacting Lennox technical support or Lennox field technical consultant.
Default is 3.0. Range is 1.0 to 15.0 in increments of 0.5.
DAT Offset
This parameter is only available when a Lennox variable capacity outdoor units is installed along with a discharge air temperature sensor (DATS) Installed is used.
Default is 0.0°F (0.0°C). Range is -5.0°F to 5.0°F (-2.88 to 2.78°C) in increments of 0.5°F (0.28°C).
DAT Proportional
Gain
(Lennox Variable
Capacity Outdoor
Units)
This is how the system attempts to reach the discharge air temperature set point.
Lennox advises not to make changes to this setting without first contacting Lennox technical support or Lennox field technical consultant.
Default is 3.0. Range is 1.0 to 15.0 in increments of 0.5.
Dew Point
Adjustment
The Dew Point Adjustment can be set from -15% to +15%. These settings allow adjustments to the Dew Point setting for the home. Some homes may require an
adjustment to help maintain comfort. If condensation is present on windows, set the adjustment lower, between -15% to -5%. If the home feels dry, set the adjustment
upwards, b5 to +15%.
NOTE:
Dew Point - Adjustment requires an outdoor air (temperature) sensor (OATS) (X2658) and is automatically controlled by the outside temperature.
Electric Heat
Control Mode
(Single and Two-
Stage Lennox
Communicating
Outdoor Units Only)
In heat pump applications, the electric heat is staged to provide supplemental heat to meet desired comfort levels. When the electric heat section is used in applications
that do not have a heat pump, the elements are staged to limit heat so that it meets heating demands only.
Options are Standard and EvenHeat. Default is Standard.
