15
Start Up and Sequence of Operation
SINGLE ZONE WHOLE HOUSE OR STAND ALONE
USING THE DEHUMIDIFIER CONTROL
1. Press the ON/OFF button to turn the dehumidifier control
ON. The display will show the current setting, and the
dehumidifier blower and HVAC blower (if wired to the
HVAC system) will turn on to start sampling the air.
The setting will be replaced by the measured humidity
and “AIR SAMPLING” will show on the display.
2. Use the UP or DOWN button to adjust the humidity
setting as desired. The recommended initial setting is
55%.
3. After three (3) minutes of sampling, the measured
humidity will be compared to the setting:
a. If the humidity is above the setting, the dehumidifier
compressor turns on and “AIR SAMPLING” will be
replaced by “DEHUMIDIFYING”. The compressor
remains on until the measured humidity falls 3% RH
below the setting.
b. If the measured humidity is below the setting, the
blowers turn off and the display returns to showing
the RH setting.
4. The dehumidifier will sample again every 60 minutes,
or at any time if the humidity setting is lowered.
SINGLE ZONE WHOLE HOUSE OR STAND ALONE
USING A LENNOX COMMUNICATING THERMOSTAT
OR Y6456 EXTERNAL CONTROL
1. Press the ON/OFF button to turn the dehumidifier control
ON. “EXTERNAL” will show on the display to indicate
that an external control is wired to the dehumidifier.
2. At the Lennox Communicating Thermostat, make sure
the Aux dehumidifier is selected in installer setup and
humidity display is turned on from the HO system settings
screen. At the Y6456, press the ON button; the Y6456
will display the measured RH.
3. From the Lennox Communicating Thermostat home
screen, press the arrow on the right side of the screen
to access the features screen, then select system setting
icon and adjust dehumidify setting to desired setting.
Use the UP or DOWN button on the Y6456 to adjust the
humidity setting as desired. The recommended initial
setting is 55%.
4. If the %RH measured by the Lennox Communicating
Thermostat rises above the dehumidification setting, the
dehumidifier will turn on as will the indoor blower, and the
home screen will show the system is dehumidifying. The
system will turn off when the %RH set point is reached. If
the RH measured by the Y6456 rises above the setting,
the dehumidifier will turn on as will the HVAC blower
(if wired to the HVAC system). “DEHUMIDIFYING” will
appear on the dehumidifier control display to show that
the Y6456 is calling for dehumidification. The dehumidifier
and HVAC blower (if on) will turn off when the RH
measured by the Y6456 drops 3% RH below the setting.
CRAWL SPACE OR SEALED ATTIC (REMOTE)
CONTROL USING Y6456
1. Press the ON/OFF button to turn the dehumidifier control
ON. “REMOTE” will show on the display to indicate that
a remote control is wired to the dehumidifier.
2. At the Y6456, press the ON button; the Y6456 will
display the RH measured at the dehumidifier, and the
dehumidifier blower will turn on to start sampling the air.
3. Use the UP or DOWN button on the Y6456 to adjust the
dryness level as desired. The dryness levels are from
1 to 7, with 1 being least dry and 7 being most dry; the
recommended initial setting is 3.
4. After three (3) minutes of sampling, the measured
humidity will be compared to the setting:
a. If the humidity is above the setting, the dehumidifier
compressor turns on and “ON” flashes on the Y6456
display.
b. If the measured humidity is below the setting, the
dehumidifier blower turns off.
5. The dehumidifier will sample again every 60 minutes,
or at any time if the dryness level is increased.
TWO ZONE – PRIMARY AND SECONDARY
1. Press the ON/OFF button to turn the dehumidifier control
ON.
Dehumidification of the Primary Zone follows the same
sequence as described to the left for Single Zone, with
or without a Y6456 external control installed in the
Primary Zone. The dehumidifier control display will show
“PRIMARY ZONE” in addition to that described to the
left when sampling or dehumidifying the Primary Zone.
The zone dampers are energized when sampling or
dehumidifying the Primary Zone.
2. The Secondary Zone uses the humidity setting on the
dehumidifier control. During Secondary Zone sampling
or dehumidification, the zone dampers are de-energized
and the HVAC blower (if on) stops. “SECONDARY
ZONE” will show on the dehumidifier control display when
the Secondary Zone is either sampling or dehumidifying.
If the Primary Zone had just finished a dehumidification
demand, the compressor will continue to run during
Secondary Zone sampling to prevent short cycling of
the compressor.
The Secondary Zone is sampled immediately after
the Primary Zone has finished sampling, or if there
is a call for dehumidification from the Primary Zone,
immediately after the call has been satisfied. When a
Y6456 external control is installed, the Secondary Zone
will be sampled once per hour if there has not been a call
for dehumidification from the Primary Zone. Secondary
Zone sampling will also occur whenever the setting on
the dehumidifier control is lowered.
