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What Is the Harmony IIR Zone Control System?
Lennox Harmony IIR 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 IIR 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 IIR system. It
organizes the operations of the thermostats, dampers, and HVAC equipment to result in total com-
fort. The Harmony IIR system operates with any of the following HVAC system combinations: Option
1 − Pulse21TM ꢀ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 IIR 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.
502,862M
02/2000
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Harmony II User’s Manual
Page 1
To Operate Harmony II® control:
Choose either Central or Zone mode.
Central Mode: Heating and cooling to all zones.
1− Press Central button on control panel.
2− Choose either Heat or Cool or Auto button on control panel.
3− Choose either Fan Auto or Fan On button on control panel. The Fan switch on all thermostats
will be inoperable. The fan is controlled at the control panel.
4− Set the zone 1 master thermostat at the same position (HEAT or COOL or AUTO) as the control
panel. If your thermostat system does not have an auto−changeover selection, set the control
panel in AUTO and the zone 1 thermostat in either HEAT or COOL. (Do not adjust other zone
thermostats since they are non−functional in Central mode.)
5− Set thermostat to desired room temperature.
Zone Mode: Heating and cooling to specific zones.
1− Press Zone button on control panel.
2− Choose either Heat or Cool or Auto button on control panel.
3− Choose either Fan Auto or Fan On button on control panel. The Fan switch on all thermostat will
be inoperable. The fan is controlled at the control panel.
4− Set each zone thermostat at the same position (HEAT or COOL or AUTO) as the control panel.
If your thermostats do not have an auto−changeover selection, set the control panel in AUTO
and the zone thermostats in either HEAT or COOL.
5− Set thermostats to desired room temperature.
Harmony II® Control Panel
Press Central for all zones
to be conditioned at the
same time.
Press Zone for specific zones to
receive conditioned air upon
each zone’s need.
Press Cool to allow cooling only.
For Central mode, Zone 1 thermo-
stat should also be set at Cool. For
Zone mode, all thermostats should
also be set at Cool.
System Off button turns
off Harmony II control.
Press Heat to allow heating only.
For Central mode, Zone 1 thermo-
stat should also be set at Heat. For
Zone mode, all thermostats should
also be set at Heat.
Press Auto to allow either cooling or
heating, depending on the need. For
Central mode, Zone 1 thermostat
should also be set at Auto. For Zone
mode, all thermostats should also be
set at Auto. If your thermostats are
not equipped with an Auto setting,
place control panel in Auto and ther-
mostats in either Heat or Cool.
Red service light flashes from be-
hind the control panel cover when
system requires service. Error
codes will be stored in control
center for readout by technician
only.
Harmony II
Press Fan Auto to allow blower to run only while system is
supplying conditioned air. The blower will cycle on and off
according to the demand for heating or cooling. By cycling on
and off, air from different zones is not mixed and better effi-
ciencies are achieved.
Press Fan On to allow blower to run continuously to circulate air. The
fan will keep running in this mode until the Fan Auto button is
pressed. Fan On tends to mix the air from different zones and effi-
ciency may suffer if Fan On option is used on a regular basis.
Page 3
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Harmony II Zone Control System
Zone # Rooms
1
2
3
4
Record which rooms are zoned together.
Lennox Dealer:
Contact:
Telephone Number:
Installation Date:
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