Lennox iComfort E30 Installation And Setup Manual page 25

Parameter
Description
(In alphabetical
order)
Ventilation Control Mode - ASHRAE
• In this mode the thermostat can assist the installer by validating the ventilation CFMs are capable of meeting the ASHRAE required ventilation volumes, but the thermostat has no ability to control
CFM from the HRV/ERV.
• The system first tries to satisfy the ventilation volume by only ventilating while conditioning is occurring. Continuous fan is not considered conditioning.
• The total volume of ventilation air is accumulated and stored to compare against the target hourly ventilation volume Vhr. The accumulated value resets each hour.
• When the remaining required volume of ventilation air for the hour divided by the fan only ventilation rate is equal to or greater than the time remaining to ventilate for the hour and no conditioning
is occurring, the system begins ventilation using continuous fan and does not stop until the target hourly ventilation volume requirement is satisfied.
• When ventilating without a conditioning demand, the ventilation output is active as well a continuous indoor fan demand.
• When ventilating with a conditioning demand, the ventilation output is active with the conditioning demand outputs.
• When the system is ventilating, the user interface can indicate as such by showing "ventilating" to the user on the home screen.
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/ERV set up is completed and the CFMs are known. Once the thermostat's CFMs are adjusted they are
used with the thermostat's timer algorithm to determine how long to run the HRV/ERV and to change from low to high speed if a 2-stage HRV/ERVs.
Ventilation Rate
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be adjusted in increments of 1.0 CFM.
(Only listed for
1-speed ERV or HRV
Ventilation Rate for
Low Speed
Parameter range is 10 - 200 CFM. Default is 50 CFM. Can be adjusted in increments of 1.0 CFM.
(Only listed for
2-speed ERV or HRV
Ventilation Rate for
High Speed
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be adjusted in increments of 1.0 CFM.
(Only listed for
2-speed ERV or HRV
Ventilation Outdoor
Options are Disabled (default) or Enabled.
Condition Override
ASHRAE Compliance
= NO (Ventilation CFM too low to comply with ASHRAE 62.2) or YES (Current settings comply with ASHRAE 62.2)
Check
ASHRAE Infiltration
Parameter range is 0.0 - 200.0 CFM. Default is 2500 square feet. Can be adjusted in increments of 1.0 CFM.
Credit
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
ASHRAE House Floor
ventilation is required is:
Area Serviced by This
Ventilator
ASHRAE Number of
Parameter range is 1.0 - 10.0. Default is 3.0. Can be adjusted in increments of 1.0.
Bedrooms
Parameter range is 60 to 115ºF. Default is 100ºF. Can be adjusted in increments of 5ºF.
Ventilation High
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
Outdoor Temperature
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
Limit
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.
Table 7. Smart Hub Parameters
Ventilation Rates
(total square footage of the home/100) + ((number of bedrooms+1) x 7.5 cfm)
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