HOMEOWNER’S
MANUAL
E2006 Lennox Industries Inc.
Dallas, Texas, USA
Harmony IIIt Zone Control
System
CONTROLS
505,024M
05/06
Litho U.S.A.
Supersedes 01/06
IMPORTANT: Read this instruction manual
completely! Retain for future reference.
Contents
Page
What Is the Harmony IIIt Zone Control System? . .
What does the system consist of? . . . . . . . . . . . . . . .
How do I set the control center switches? . . . . . . . . .
How do I use the thermostat controls? . . . . . . . . . . .
What does the service light indicate? . . . . . . . . . . . . .
How do I use the central (Vacation) mode? . . . . . . .
How do I use the zone mode? . . . . . . . . . . . . . . . . . . .
How are zones determined? . . . . . . . . . . . . . . . . . . . .
Thermostat replacement and maintenance . . . . . . . .
Homeowner’s Zone Information Record . . . . . . . . . .
05/06
505,024M
*2P0506*
*P505024M*
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2. Emergency Heat switchꢁWhen the Harmony IIIt
control center is used with a heat pump and the Emer-
gency Heat switch is turned ON, the unit will satisfy all
heating demands with electric backup heat. When the
Emergency Heat switch is OFF, the heat pump is used
to satisfy heating demands. (This switch has no effect
on operation in a non-heat pump system, for example,
Option 1, described on page 2.)
NOTE − Usually, Emergency Heat is more expensive
to operate than Heat Pump heating. If so equipped,
use Emergency Heat only when necessary.
To turn off the system, either: A − Turn each thermostat to
OFF, or B − Turn the master thermostat OFF and turn the
control center to central (Vacation ON) mode.
Damper LEDs come on to indicate
the damper to zone # is CLOSED
(No air being permitted to LIT zone)
Vacation OFF for individual zone control.
ON indicates only Zone 1
thermostat is functional and
controlling air to ALL zones.
Vacation ON for all zones to be conditioned
at the same time.
Comes on when
Emergency Heat
switch set to ON
Emergency Heat OFF to allow Heat Pump
to provide heat.
Emergency Heat ON to force auxiliary
(backup) heat to provide all heating
(disallows heat pump from providing any
heat).
LEDs come on to indicate the current operating mode
Page 3
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How do I use the thermostat controls?
What does the service light indicate?
On heat pump systems only, the service light, located on
the master thermostat, indicates that the outdoor unit re-
quires service. The service lights on zone 2, 3 and 4 ther-
mostats are not functional. Call your Lennox service tech-
nician if the service light on the zone 1 thermostat is lit.
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:
S
S
S
HEAT setting tells the control center that it should pro-
vide heat to the zone(s) when it is needed.
How do I use the central (Vacation) mode?
When you choose central (Vacation ON) mode, heating
and cooling will affect all zones.
COOL setting tells the control center to provide cool air
to the zone(s) when there is a need.
1. Move the Vacation switch on the control center to ON.
2. Choose either HEAT or COOL or AUTO on the master
(zone 1) thermostat.
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 morn-
ing but still warms in the afternoon. By placing the ther-
mostats in AUTO, heating would come on in the morn-
ing and cooling in the afternoon, if needed.
3. Choose either FAN AUTO or FAN ON on the master
thermostat.
4. Set master thermostat to desired room temperature.
How do I use the zone mode?
When you choose zone (Vacation OFF) mode, heating
and cooling is controlled by specific zone thermostats.
1. Move the Vacation switch on the control center to OFF.
S
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 sys-
tem make it possible to have some zones call for con-
tinuous fan (FAN ON) while other zones are set to FAN
AUTO.
2. Choose either HEAT or COOL or AUTO on each ther-
mostat (thermostats need not be set alike).
3. Choose either FAN AUTO or FAN ON on each thermo-
stat (these may be set differently in each zone).
4. Set thermostats to desired room temperature.
Page 4
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time are zoned together. Bedrooms which are general-
ly used at night, should not zoned with a living room
that is used only during the day or evening.
How are zones determined?
Your Lennox dealer has sectioned the rooms of your home
or building into zones using the following considerations:
1. Structural and Architectural ConsiderationsꢁIn multi-
level houses using regular HVAC systems, heated air
rises to the upper floor(s) causing those rooms be-
come too hot. Zoning will remedy this situation by split-
ting the conditioned space into two specific zones (first
and second floors). The second floor temperature is
now controlled by its own thermostat, not that of the
first floor.
OWNER REMINDER! Be sure the system installer has re-
has identified a contact person and phone number in case
of problems.
Thermostat replacement
In the event a thermostat should fail and require replace-
ment, be aware that not all thermostats will work for all sys-
tems. Certain types of thermostats, known as power-rob-
bing thermostats, have no ꢀC" (common) wire connection
terminal; these can cause unintended system operation
and therefore must not be used. Call your Lennox dealer to
help you identify and install an appropriate thermostat with
a ꢀC" terminal.
2. Climate ConsiderationsꢁExposure 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 expo-
sure 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 expo-
sure.
Maintenance
Once your Lennox Harmony IIIt Zone Control System is
properly installed, no maintenance is required for the con-
trol panel’s components. Only standard heating and cool-
ing equipment (HVAC) maintenance is required.
3. Occupancy ConsiderationsꢁA single structure con-
tains 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 condi-
tioned. Rooms that are used or occupied at the same
If you experience problems turning the system on to either
heat or cool, the problem may simply be a programmed
time delay, which, in most cases, would expire within 5 to
20 minutes. Such delays are normal and are built-in to as-
sure proper equipment operation.
Page 5
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