Humiditrol; Auxiliary Dehumidifier - Lennox iComfort M30 Installation And Setup Manual

Table 10. Dehumidification Modes
Option Description
• Activate: IF RH measured is >= (RH set point + 2%),
and if T measured >= T set point – 0°F to 4°F )AND
unit is in Cool mode (O = ON), then D is inactive
(open circuit), and G, Y1, and Y2 (if available) are
ON.
• Deactivate: IF RH measured is <= (RH set point -
2%), or if T measured < T set point - 0°F to 4°F) or
Max
unit isn't in Cool mode(B = ON), then D is active.
Y1 and Y2 are OFF and G returns to the state
determined by the thermostat control, either ON,
Auto, or CIRC.
NOTE: H is inactive (open circuit) during
dehumidification.

Humiditrol

This option is available if the Humiditrol 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. In this mode, the H/D terminal (if selected
for dehumidify) is always ON (24VAC) when
the outdoor temperature is greater than 95°F.
This prevents the system blower from running at
reduced speed if the outdoor temperature is greater
than 95°F.
NOTE: The outdoor temperature sensor MUST
be attached to the unit in order to use this
mode.
Equipment Operation with Humiditrol Enabled
Notes:
The Humiditrol Comfort Adjust (HCA) variable is user-selectable and can be set to MIN, MAX,or
MID
Humiditrol prohibited if outdoor temperature > 95
RUN EQUIPMENT IN
NORMAL COOLING
MODE
RUN EQUIPMENT IN
NORMAL HEATING
MODE
DEACTIVATE ALL
EQUIPMENT
DEACTIVATE ALL
EQUIPMENT
Figure 10. Equipment Operation with Humiditrol

Auxiliary Dehumidifier

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
41
o F OR if indoor temperature < 65 o F
START
YES
IS THERE A COOLING
DEMAND?
NO
YES IS THERE A HEATING
DEMAND? RUN HUMIDITROL
NO
IS THERE A
NO
DEHUMIDIFICATION
DEMAND?
YES
IS HCA = MAX, AND
YES
INDOOR TEMPERATURE > 2 o F
ABOVE HEATING SETPOINT?
NO
IS HCA = MIN, AND
YES
INDOOR TEMPERATURE >
2 o F BELOW COOLIING
SETPOINT?
NO
IS HCA = MID, AND
NO
INDOOR TEMPERATURE > YES
(HEATING
SETPOINT+COOLIING
SETPOINT)/2?
Enabled