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Table 6. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
ASHRAE Infiltration
Credit
Parameter range is 0.0 - 200.0 CFM. Default is 0 CFM. Can be adjusted in increments of 1.0 CFM.
ASHRAE House
Floor Area Serviced
by This Ventilator
Parameter range is 500.0 - 5000.0 square feet. Default is 2500.0 CFM. Can be adjusted in increments of 100.0 square feet. The formula for calculating how much
ventilation is required is:
(Total square footage of the home/100) + (number of b1) x 7.5 cfm
ASHRAE Number of
Bedrooms
Parameter range is 1.0 - 10.0. Default is 3.0. Can be adjusted in increments of 1.0.
Fresh Air Damper
Ventilation CFM
Parameter range is 20 - 250 CFM. Default is 75 CFM. Can be adjusted in increments of 1.0.CFM
Ventilation Outdoor Condition Override - Enabled
Ventilation
High Outdoor
Temperature Limit
Parameter range is 60 to 115ºF. Default is 100ºF. Can be adjusted in increments of 5ºF.
While the outdoor temperature is equal to or higher than the setting for
Ventilation High Outdoor Temperature Limit
, ventilation does not run. When locked out due
to high outdoor temperature, it will become unlocked when either the outdoor temperature is missing, or when the temperature reported is 1°F less than the
Ventilation
High Outdoor Temperature Limit
setting when display units are in Fahrenheit, or is reported as 0.5°C less than lock out setting when the display units are Celsius.
Ventilation
Low Outdoor
Temperature Limit
Parameter range is -20 to 55ºF. Default is 0ºF. Can be adjusted in increments of 5ºF.
While the outdoor temperature is lower than the setting for the
Ventilation Low Outdoor Temperature Limit
, ventilation does not run. When locked out due to low
outdoor temperature, it will become unlocked when the outdoor temperature is missing, or when the temperature reported is 1°F higher than the
Ventilation Low
Outdoor Temperature Limit
setting when display units are Fahrenheit, or is reported as 0.5°C higher than lock out setting when the display units are Celsius
Ventilation High
Outdoor Dew Point
Limit
Parameter range is 45 to 80ºF. Default is 55ºF. Can be adjusted in increments of 5ºF.
While the outdoor dew point is higher than the setting for the high outdoor dew point limit, ventilation does not run. When locked out due to high outdoor dew point limit,
it will become unlocked when the outdoor dew point is missing, or when the dew point temperature reported is 1°F less than the lock out setting when display units are
Fahrenheit, or is reported as 0.5°C less than lock out setting when the display units are Celsius.
Wall Insulation
Options are poor, average and good. Default is average.
Zone 1 through
4 First Stage
Differential
Differential is the temperature between when first stage will cycle ON and cycle OFF. (Example: Zone 1 HD Display is set at 70°F (21°C) with a 1.0°F (0.56°C) differential.
Cooling Demand - cooling will cycle ON when the room temperature reaches 70.5°F (21.4°C) and cycle OFF when the room temperature is 69.5°F (20.8°C).
Range is 0.5 to 3°F (0.28 to 1.67°C). Default is 1°F (0.56°C). Adjustments are in increments of 1°F (0.56°C).
NOTE:
For Lennox variable capacity outdoor units the differentials are ignored.
Zone 1 through
4 Continuous
Blower CFM
Minimum and maximum CFM will be dependent on system component configurations. These parameter values are automatically adjusted to the specific hardware
configuration. See iHarmony zoning system installation instruction for minimum CFMs for specific indoor units.
Zones requesting the fan ON are only allowed while no other zone demand is present. The thermostat will sum all the zone continuous blower CFM requirements and
send the command only after positioning the dampers and waiting for the damper close delay period to expire (30 seconds) Continuous blower demands are the lowest
priority demands, all other conditioning demands will over-ride the continuous blower demand.
Range is 5 CFM to maximum of indoor unit. Default is dependent on tonnage of indoor unit. Adjustments are in increments of 5 CFM.
Zone 1 through 4
Cooling CFM
Minimum and maximum CFM will be dependent on system component configurations. These parameter values are automatically adjusted to the specific hardware
configuration. See iHarmony zoning system installation instruction for minimum CFMs for specific indoor units.
Target cooling CFM for a specific zone. Range is 5 CFM to maximum of indoor unit. Default is dependent on tonnage of indoor unit. Adjustments are in increments of 5
CFM.
Zone 1 through 4
Heating CFM
Minimum and maximum CFM will be dependent on system component configurations. These parameter values are automatically adjusted to the specific hardware
configuration (See table 9 in iHarmony installation instruction for minimum CFMs for specific indoor units).
Target heating CFM for a specific zone. Range is 5 to maximum of indoor unit. Default is dependent on tonnage of indoor unit. Adjustments are in increments of 5 CFM.
Adjustments are in increments of 5 CFM.
