User Guide; What Is The Harmony Iii™ Zoning System; What Does The Harmony Iii™ Zoning System Consist Of; How Do I Set The Control Center Switches - Lennox HARMONY III Installation, Setup And User Manual

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8.1. What is the Harmony III™ zoning system?
Lennox Harmony III zoning system manages the distribution of conditioned air
to as many as four specific areas or zones in the home. The Harmony III is an
advanced control system that allows a home to be zoned for heating and cooling
without the extra expense of purchasing two or more HVAC (Heating, Ventilation,
and Air Conditioning) systems.
This control allows the owner to heat or cool occupied areas, without conditioning
unused areas. The system adapts the HVAC components to provide a balanced
and comfortable environment.
8.2. What does the Harmony III™ zoning system consist
of?
The principle system component is the control center which acts as the "brains" of
the Harmony III zoning system. It coordinates all of the operations of thermostats,
motorized dampers, and HVAC equipment.
Harmony III zoning system uses off-the-shelf 1-heat/1-cool, non-power-robbing,
non-heat pump electronic thermostats and motorized dampers with one of the
following Lennox HVAC systems to distribute conditioned air to zones:
• Option 1. Gas Furnace with Variable Speed Blower Motor (VSM) and either a
single- or two-speed air conditioner unit.
• Option 2. Blower coil unit with Variable Speed Blower Motor and either a single-
or two-speed heat pump.
• Option 3. Gas furnace with Variable Speed Blower Motor and heat pump.
• Option 4. Adding Humiditrol Interface to any of the above options.
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8.3. How do I set the Control Center Switches?
The Harmony III control center has only two ON/OFF switches (see illustration).
For the most part, the system relies on thermo- stats to provide control of the
desired comfort level for each zone. The control center also has LEDs (light
emitting diodes) which light to indicate the current operating mode and which zone
dampers are closed.
Later models of the Harmony III™ control center board includes connecting points
for a remote vacation switch which may be installed near the Zone 1 thermostat for
the homeowners convenience.
1. Vacation Switch. The Harmony III control center operates in either of two
modes: central mode (Vacation switch ON) or zone mode (Vacation switch
OFF).
• Central Mode (Vacation ON) − all zones receive conditioned air at the
same time (like traditional, non−zoned HVAC systems). The master
thermostat (located in Zone 1) controls any heating or cooling need for all
zones in the building.
Zone Mode (Vacation OFF) − specific zones are conditioned only when
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the demand comes from that zone. Each zone (not necessarily each room)
has its own thermostat. The individual zone thermostats only work when
the control center is in zone mode.
IMPORTANT
The heating and air conditioning equipment includes safety devices that protect
you and your property. If one or more of these devices is activated, heating
operation will stop. If your home is left unattended for an extended period of
time, equipment operation must be checked periodically. If this is not possible,
the water supply to the house should be shut off and the pipes should be drained.
This will prevent problems associated with a NO HEAT condition (frozen pipes,
etc.)
8.4. How do I use the Thermostat Controls?
Whether in central mode (where only zone 1 thermostat is functional) or in the
zone mode (where all thermostats are functional), thermostats function as in a
traditional, non−zoned, system. That is:
• HEAT setting tells the control center that it should provide heat to the zone(s)
when it is needed.
• COOL setting tells the control center to provide cool air to the zone(s) when there
is a need.
• AUTO setting allows either heating or cooling to occur, depending on the need.
This selection is best in spring or autumn, when the temperature is cool in the
morning but still warms in the afternoon. By placing the thermostats in AUTO,
heating would come on in the morning and cooling in the afternoon, if needed.
• FAN AUTO or FAN ON tells the control center how the blower should operate.
Select one or the other. FAN AUTO allows the blower to turn on and turn off with
the heating or cooling needs. FAN ON tells the blower to run continuously. Zone-
controlled dampers in the system make it possible to have some zones call for
continuous fan (FAN ON) while other zones are set to FAN AUTO.
8.5. How do I use the Central (Vacation) Mode?
When you choose central (Vacation ON) mode, heating and cooling will affect all
zones.
1. Move the vacation switch on the zone control to VACATION ON (or, if used,
move the remote vacation switch to "vacation on").
2. Choose either HEAT or COOL or AUTO on the master (zone 1)
thermostat.
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