Auxiliary Dehumidifier; Humidification Control - Lennox iComfort M30 Installation And Setup Manual

a D
Uxiliary eHUmiDifier
This option is available if the Auxiliary Dehumidifier
accessory is present and enabled in the Advanced
Settings > System Setup. Under Advanced
Settings > Terminal Settings, verify that the
H/D or ACC terminals are configured correctly for
dehumidify control.
Cooling demand only: Y1 and Y2 come on
initiating the conventional cooling only demand.
Dehumidification demand only: D is de-
energized (G should also be energized) but with
out Y1 or Y2. D remains off until the demand is
satisfied or if a true cooling demand comes on (unit
must be in cooling mode).
Both cooling and dehumidification demands:
Y1 and Y2 are ON (G must be ON and D is also
0 volts) When cooling is satisfied , D is still 0 volts
and G must stay ON until dehumidification demand
is satisfied.
Table 10. Auxiliary Dehumidifier Option
Option Description
• Activate: If RH measured is >= (RH set
point + Activate: IF RH measured is >=
(RH set point + 2%), and AND unit is in
Cool mode (O = ON),, THEN D is inactive
(open circuit), AND G is ON.
Normal
• Deactivate: IF RH measured is <= (RH set
point - 2%), or unit isn't in Cool mode(B
= ON), THEN D is active. G returns to
the state determined by the thermostat
control, either ON, Auto, or CIRC.

Humidification Control

This option is available if the humidifier accessory
is present and enabled in the Advanced Settings
> System Setup.
Under Advanced Settings > Terminal Settings,
verify that the H/D or ACC terminals are configured
correctly for humidify control.
Humidification is provided only when both a
humidification accessory is installed and the
thermostat is in heat mode.
• Setpoint Range: 15 – 45% RH
• Relative Humidity Controlled to 2% of Setpoint
(1% resolution)
• "H/D" Terminal to Humidifier (deactivated during
cooling)
• This behavior changes based on H/D terminal or
ACC terminal
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