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Harmony II
®
User’s Manual
502,862M
02/2000
Page 1
What Is the Harmony II
R
Zone Control System?
Lennox Harmony II
R
Zone Control System manages the distribution of conditioned air to as many as four
specific areas or zones in a home or small commercial building. The Harmony II
R
control Is an advanced
control system that allows a home to be zoned for heating and cooling without the extra expense of pur-
chasing 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, re-
sulting in lower utility bills. This control orchestrates the system components to provide a balanced
and comfortable environment.
The system consists of the control panel and the control center. The Harmony II control panel is your
link to a comfortable enviroment. The control panel is usually located near the main or master ther-
mostat. The control center is the larger control box and is the brains" of the Harmony II
R
system. It
organizes the operations of the thermostats, dampers, and HVAC equipment to result in total com-
fort. The Harmony II
R
system operates with any of the following HVAC system combinations: Option
1 − Pulse21
TM V" series gas furnace and either a single− or two− speed condensing unit; Option 2 −
CB21 series blower coil unit and either a Lennox single− or two− speed heat pump; or Option 3 −
Pulse21 V" series gas furnace, a Lennox heat pump, and the FM21 control. Harmony II
R
zone con-
trol system uses off−the−shelf thermostats and dampers with any of the above systems to distribute
conditioned air to zones.
How Are Zones Determined?
Your Lennox dealer has sectioned the rooms of your home or building into zones using the below
considerations.
Structural/Architectural Considerations
In multi−level houses using regular HVAC systems, heated air rises to the upper floor(s) causing those
rooms become too hot. Zoning will remedy this situation by splitting the conditioned space into two
specific zones (first and second floors). The second floor temperature is now controlled by its own ther-
mostat, not that of the first floor.
Climate Considerations
Exposure from the sun and weather can produce cold and hot spots in homes that are conditioned
with the use of one thermostat. Zoning lessens this by grouping rooms with the same exposure into
one zone. Therefore, a room with a northern exposure and a room with a southern exposure should
not be zoned together. In the winter, the northern room may be too cool while the southern room may
be too hot. In order to keep a balance of conditioned air, the zone must contain rooms with the same
weather exposure.
Occupancy Considerations
A single structure contains different types of living spaces. Without zoning, it is difficult to condition all
areas so that everyone will be comfortable. Zoning a home or office allows the owner to control the
zones which need to be conditioned. Rooms that are used or occupied at the same time are zoned to-
gether. Bedrooms which are generally used at night, should not zoned with a living room that is used only
during the day or evening.