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Using the Harmony II
®
Control Panel
The Harmony II
R
control panel is where the control center gets its information on how to operate. It
works with the thermostats to provide a desired comfort level for each zone. The Harmony II
®
control
panel uses LEDs (light emitting diodes) to display the current operating mode.
The Harmony II
R
system operates in either of two modes: Central mode or Zone mode. In Central
mode, all zones receive conditioned air at the same time, just like a traditional heating and air condi-
tioning system. The master thermostat located in zone 1 controls any heating or cooling need for the
entire building. When the Harmony II
R
system is placed in Zone mode, specific zones are condi-
tioned only when the demand comes from that zone. Notice that each zone, not each room, has its
own thermostat. These thermostats only work when the control panel is in Zone Mode. The System
Off button will turn off the Harmony II
R
control.
The Heat, Cool, and Auto buttons on the control panel tell the control center what type of air to pro-
vide and are available in Central and Zone modes. Select one operation (Heat, Cool or Auto) at a
time. The Heat selection, tells the control center that it should provide heat to the zones when it is
needed. The Cool selection, in turn, tells the control center to provide cool air to the zones when
there is a need. The Auto selection is the most flexible choice since it allows either heating or cooling
to occur, depending on the need. This selection is particularly nice in times of seasonal changes. For
example, in the spring, the temperature is cool in the morning and warm in the afternoon. By placing
the control panel and thermostats in Auto, heating will come on in the morning and cooling in the
afternoon, if needed.
The Fan Auto and Fan On buttons on the control panel tell the control center how the blower should
operate. Select one operation (Fan Auto or Fan On) at a time. Fan Auto allows the blower to cycle on
and off with the heating or cooling needs. The Fan On selection allows the blower to run continuous-
ly. To stop the blower, press the Fan Auto button.
Service Light
A red LED, visible only when an error occurs, indicates an error condition has been logged in the
control center and either the inside unit or zone control system requires service. Alert your Lennox
service technician that the Harmony II
R
control panel service light is on. Also inform the technician if
the light is lit steadily or if it flashes off and on. DO NOT try to diagnose error codes or repair control
panel. The control center must be handled by qualified service technicians only. Tampering with con-
trol center may result in electrical shock and damage to the control center.
NOTE − The service light located in the master thermostat (heat pumps only) provides a separate
function indicating the outdoor unit requires service. The service light in zone 2, zone 3 and zone 4
thermostats is not functional. Call your Lennox service technician if the service light on the zone 1
thermostat is lit.