Air Filter Reminders; Operation (Manual) - Forced Cooling Mode; Operation (Wireless Remote Controller); Requirements - Lennox MHA Series Manual

Air Filter Reminders

Table 2. Air Filter Reminders
After 240 hours of use, the display
window on the indoor unit will flash "CL."
This is a reminder to clean your filter.
After 15 seconds, the unit will revert to its
previous display.
Air Filter Cleaning
To reset the reminder, press the LED
Reminder
button on your remote control 4 times, or
press the MANUAL CONTROL button 3
times. If you don't reset the reminder, the
"CL" indicator will flash again when you
restart the unit.
After 2,880 hours of use, the display
window on the indoor unit will flash "nF."
This is a reminder to replace your filter.
After 15 seconds, the unit ill revert to its
previous display.
Air Filter
Replacement
To reset the reminder, press the LED
Reminder
button on your remote control 4 times, or
press the MANUAL CONTROL button 3
times. If you don't reset the reminder, the
"nF" indicator will flash again when you
restart the unit.

Operation (Manual) - Forced Cooling Mode

In the event that your remote control fails to work, your unit
can be operated manually with the MANUAL CONTROL
button located on the indoor unit. Note that manual operation
is not a long-term solution, and that operating the unit with
your remote control is strongly recommended.
Figure 4. Manual Control Button
IMPORTANT
Unit must be turned off before using manual operation
procedures.
To operate your unit manually:
1. Open the front panel of the indoor unit.
2. Locate the MANUAL CONTROL button on the right-
hand side of the unit.
Indoor Unit Control Box
Area (under front panel)
Manual Control Button
3. Press the MANUAL CONTROL button to activate
FORCED AUTO mode. Both FORCE HEATING and
COOLING is preset to 75ºF (24ºC) and cannot be
manually adjusted.
4. Press the MANUAL CONTROL button second time
to activate FORCED COOLING mode. Force cooling
mode is preset to 75ºF (24ºC) and cannot be manually
adjusted.
5. Press the MANUAL CONTROL button a third time
to activate FORCE HEATING mode. Force heating
mode is preset to 75ºF (24ºC) and cannot be manually
adjusted.
6. Press the MANUAL CONTROL button again to turn the
unit off.
7. Close the front panel.

Operation (Wireless Remote Controller)

IMPORTANT!
Frequent changes to operating mode may cause system
malfunction. Allow at least one minute between mode
changes for the system to stabilize.

Requirements

Using the remote controller
• Point the remote controller directly at the indoor unit.
• Stand within 26 feet (8 meters) of the indoor unit.
• Do not block the signal between the remote controller
and indoor unit.
NOTE: The remote controller will not function without a
clear line of sight to the indoor unit.
• Do not submerge the remote controller in liquid.
• Do not expose to direct sunlight.
• Do not drop or step on remote controller.

Remote Control Holder

Use field-provided fasteners to attach the remote controller
holder to any suitable vertical surface such as a wall.

Remote Control Specifications

Table 3. Specifications
Rated voltage
Min voltage for sending signal
to CPU
Effective transmitting distance
Operation conditions
4
3.0 VDC (2 AAA batteries)
2.4 VDC
26 feet (8 meters)
23°F to 140°F (-5 to 60°C)