iComfort Wi-Fi
®
7-Day Programmable Communicating Thermostat
Page 21
DEHUMIDIFICATION — HOW IT WORKS
Remember that the humidification only operates while in the heating mode and dehumidification only operates while in
the cooling mode.
OFF, MEDIUM AND HIGH—These modes allow user control of relative humidity between 40% and 60% RH.
These conditions must be met for either mode to operate:
de-humidification mode has been enabled, and
the unit is in COOL mode, and
de-humidification demand exists (0V present at H), and
MEDIUM mode also requires presence of cooling demand [Y for HP heat, or W for gas heat (W may be energized with G
de-energized)].
HIGH mode requires the system to be in the cooling mode and to of had a cooling call prior to the dehumidification call.
Their does not need a cooling call to be present to bring on Humid dehumidification. This mode can over-cool the space
by 2°F while trying to satisfying the dehumidification demand.
Humiditrol
®
or Auxiliary Dehumidifier mode requires:
NOTE - Systems using iComfort
®
and a dehumidifier - “Dehum” jumper on furnace/air handler control does not need to
be cut when using with a iComfort Wi-Fi
®
thermostat.
Wi-Fi is operational or outdoor sensor is installed and set up
Dehumidification has been enabled on installer settings, and
the unit is in COOL mode, (or if in AUTO, at least one thermostat cooling call made prior to the dehumidification
demand), and
a dehumidification demand exists (RH above set point), and
outdoor temp. below 95°F; indoor temp. above 65°F, and
for HUMIDITROL, adjust Humiditrol
®
comfort parameters as follows:
HEAT setpoint + COOL setpoint
2
MAX adj. - Indoor temp > 2°F above heating set point
MID adj. - Indoor temp >
MIN adj. - Indoor temp > 2°F below cooling set point
Figure 18. Humidifier Controls (Non-Communicating Outdoor Unit)
Auxiliary Dehumidification (Communicating and Non-Communicating Outdoor Units
Control State Conditions
Auxiliary dehumidification is controlled by iComfort
®
thermostat with or without zoning.
System must be in cooling mode and have a call for
dehumidification from the iComfort
®
thermostat. This
will start the auxiliary dehumidifier.
A separate wire from auxiliary dehumidifier will need to
be run to G terminal on indoor unit control to start the
blower.
Auxiliary dehumidification is controlled by dehumidification
control with or without zoning
Needs a dehumidification demand from the stand-alone de
humidification thermostat and a separate wire run to G ter
minal on indoor unit to start the blower.
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