Zoning Application; Operation Of Fresh Air Dampers With Environmental Overrides; Wiring; Ventilation Control Modes - Lennox iComfort E30 Installation And Setup Manual

used to determine the ventilation volume requirement and the amount of
ventilation air delivered use this number regardless of the actual fan speed.

Zoning Application

• When ventilation is demanded in zoned applications without conditioning
calls, the fresh air damper will open and the blower will run at the lowest set
zone CFM referred to above.
• Ventilation while a zone is being conditioned is serviced simply by opening
the fresh air damper while the zone system conditions the zone.
• The system keeps track of the amount of ventilation delivered in the same
manner as any single speed HRV or ERV.
• When the time required to satisfy the ventilation time requirement using the
fresh air damper ventilation rate is greater than or equal to the time remaining
in the ventilation time block, then ventilation is initiated and continues until
the ventilation time requirement is satisfied.

Operation of Fresh Air Dampers with Environmental Overrides

• When the Non-ASHRAE Compliant mode is selected (Timed), the system
first checks for the outdoor temperature and dew point to be within the set
parameter range before allowing ventilation to occur.
• When the ventilation changes states (on/off) due to an environmental
override, it will remain in that state for a minimum of 10 minutes before again
changing states due to an environmental override.
• Operation is otherwise the same as the ASHRAE compliant method

Wiring

Parameter settings and descriptions are listed in "Table 7. Smart Hub
Parameters" on page 18. The table below list which parameters are available
for the Fresh Air Damper, ERV and HRV equipment.
Wiring connections are listed in "Figure 15. iComfort E30 to either ERV or
HRV" on page 10 and "Figure 16. iComfort E30 to Fresh Air Damper" on
page 10.

Ventilation Control Modes

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.
Table 13. Ventilation Control Modes
Ventilation Control Mode
Ventilation Minutes Per Hour
(0 to 60 min., default is 20 min.)
Ventilation Rate
(20 to 500 cfm, default is 130 cfm)
(Shown only for single speed ERV or HRV)
Ventilation Rate for Low Speed
(10 to 200 cfm, default is 50 cfm)
(Shown only for two speed ERV or HRV)
Ventilation Rate for High Speed
(20 to 500 cfm, default is 130 cfm)
(Shown only for two speed ERV or HRV)
Ventilation High Outdoor Temperature Limit
(60 to 115°F, default is 100°F)
Ventilation Low Outdoor Temperature Limit
(–20 to 55°F, default is 0°F)
Ventilation High Outdoor Dew Point Limit
(45 to 80°F, default is 55°F)
NOTE: 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.
Ventilation Rate
(20 to 500 cfm, default is 130 cfm)
Ventilation Rate for Low Speed
(10 to 200 cfm, default is 50 cfm)
Ventilation Rate for High Speed
(20 to 500 cfm, default is 130 cfm)
ASHRAE Compliance Check
ASHRAE Infiltration Credit
(0 to 200 cfm, default is 0 cfm)
ASHRAE House Floor Area Serviced by this
Ventilator
ASHRAE Number of Bedrooms
Ventilation Outdoor Condition Override - Enabled
Ventilation High Outdoor Temperature Limit
(60 to 115°F, default is 100°F)
Ventilation Low Outdoor Temperature Limit
(–20 to 55°F, default is 0°F)
30
1 2
Fresh Air
Speed Speed
Damper
HRV HRV
Timed
X X X
X X
X
X
X X X
X X X
X X X
ASHRAE (62.2)
X X
X
X
NO YES YES
X X X
X X X
X X X
X X X
X X X
1 2
Speed Speed
ERV ERV
X X
X
X
X
X X
X X
X X
X
X
X
YES YES
X X
X X
X X
X X
X X