Humidification And Dehumidification Modes How They Work - Lennox icomfort Wi-Fi Setup Manual

Humidification and Dehumidification Modes how they work

HUMIDIFICATION modes
BASIC & PRECISION These modes allow user control of RH between 15
and 45%. These conditions must be met for either mode to operate:
S
humidification mode has been enabled, and
S
the unit is in HEAT mode, and
S
humidification demand exists (24V present at H), and
S
BASIC mode also requires presence of heating demand [Y for HP
heat, or W for gas heat (W may be energized with G de−energized)].
DEW POINT (Available only if Wi−Fi is operational or outdoor sensor is at-
tached)
Basic Dew Point Control Basic Dew Point Control adjustment mode will
change the humidification setpoint based on the outdoor temperature and a
user−defined dew point adjustment setting.
Precision Dew Point Control Precision Dew Point Control adjustment
mode will operate when these conditions are met:
S
humidification mode has been enabled, and
S
the unit is in HEAT mode, and
S
humidification demand exists (24V present at H).
DEHUMIDIFICA TION modes
NOTE − Basic and Precision dehumidification modes are functions of the
HVAC system with NO external dehumidification devices installed. Humidi-
trol and Auxiliary Dehumidifiers do not use these modes.
In BASIC mode, dehumidification occurs if these conditions are met and sig-
nals are present at specific terminals:
S
dehumidification has been enabled on installer settings, and
S
the unit is in COOL mode, and
S
dehumidification demand exists (RH above setpoint), and
S
cooling demand exists (Y1 energized).
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In PRECISION mode, dehumidification occurs if all BASIC conditions are
true, except cooling demand may or may not be present. Also note that:
S
Maximum overcool from cooling setpoint is 2ºF.
S
Deadband temperature is limited to a minimum of 5ºF (instead of 3ºF
in BASIC or DISPLAY ONLY mode) because of 2ºF overcooling.
®
Humiditrol or Auxiliary Dehumidifier mode requires:
NOTE − Systems using icomfortt and a dehumidifier − Dehum" jumper on
furnace/air handler control does not need to be cut when using with a icom-
fort Wi-Fit thermostat.
S
Wi−Fi is operational or outdoor sensor is installed and set up
S
dehumidification has been enabled on installer settings, and
S
the unit is in COOL mode, (or if in AUTO, at least one thermostat cool-
ing call made prior to the dehumidification demand), and
S
a dehumidification demand exists (RH above setpoint), and
S
outdoor temp. below 95°F; indoor temp. above 65°F, and
S
for HUMIDITROL, adjust Humiditrol
MAX adj. − Indoor temp > 2°F above heating setpoint
MID adj. − Indoor temp >
MIN adj. − Indoor temp > 2°F below cooling setpoint
Auxiliary Dehumidifier (stand alone dehumidifier)
When this option is selected, dehumidification will be allowed under the fol-
lowing conditions, provided there is NO call for humidification:
S
In the absence of heating or cooling calls, or
S
Simultaneous with blower only calls.
If the blower is required to operate while the auxiliary dehumidifier is running,
a separate wire must be installed from the auxiliary dehumidifier to the indoor
unit's G thermostat input that will energize G when the auxiliary dehumidifier
is running (see wiring diagram on Page 61).
Auxiliary dehumidification is controlled by the thermostat dehumidification
demand.
NOTE − Refer to HCWH Dehumidifier Installation Instructions for installation
recommendations.
Page 18
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comfort parameters as follows:
HEAT Setpoint+COOL Setpoint
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