SEQUENCE OF OPERATION
When wired as shown in
Figure 26
, the ventilation damper
will open whenever there is an HVAC heating (W), cooling
(Y) or fan (Gs) call, allowing fresh air to be brought in when
the HVAC blower is running (see VENTILATION WITH
AN EXTERNAL CONTROL section below for exceptions).
The ventilation damper will also open if the dehumidifier is
operating. “VENTILATING” will show on the dehumidifier
control when the dehumidifier is actively ventilating. When
the HVAC call ends, the dehumidifier stops, or after the set
amount of ventilation time has been met, the ventilation
damper will be closed.
If the set amount of ventilation time has not been met
before the end of the one-hour cycle, the dehumidifier will
open the ventilation damper and turn on the HVAC blower
to ensure the desired ventilation time is satisfied.
If the dehumidifier has been set up to operate ventilation
with outdoor temperature restrictions (AUTO-B, AUTO-C or
AUTO-D – refer to page 16) then ventilation will be limited
as described.
Dehumidifying the Fresh Air
When the dehumidifier is set up for single zone and there
is no external control installed, the dehumidifier will turn
on its blower and measure the RH of the air entering the
dehumidifier during ventilation when ducted as shown in
Figure 24
. If the relative humidity of the air entering the
dehumidifier is higher than the setting, the dehumidifier
compressor will turn on to remove moisture.
Ventilation with an External Control
When an external control is installed the dehumidifier will
open the ventilation damper only when there is a cooling
call (Y) or when the dehumidifier is operating, unless the
ventilation need has not been met. If the set amount of
ventilation time has not been met before the end of the
one-hour cycle, the dehumidifier will open the ventilation
damper and turn on the HVAC blower to ensure the desired
ventilation time is satisfied.
Adjusting Ventilation Time After Initial Set Up
90-1854
1.
Press the UP or DOWN
button to access the RH
adjustment screen or to
turn on the backlight if
using an External Control.
90-1854
2.
Press the MODE button
to toggle to the VENT
TIME setting.
3.
Press the UP or DOWN
button to adjust the
ventilation time (minutes).
After adjusted, press
nothing else; the screen
will return to home screen
after three (3) seconds.
Troubleshooting
Technical Support is available Monday through Friday,
6:30 a.m. to 6:30 p.m. CST, at 1-800-LENNOX (800-453-
6669). Use the guides on the following pages to identify
and correct system faults. Contact Technical Support before
replacing the unit or any components and for additional
troubleshooting.
ERROR CODES
When an error occurs, the Error Code along with SERVICE
REQUIRED will be displayed on the control screen. See
Table 4
for possible Error Codes and
Table 5
for the
Troubleshooting Guide.
90-1854
NOTE: Do not try to service the refrigeration compo-
nents in the dehumidifier. Call Technical Support for
assistance.
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