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Page 5
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 ConsiderationsĊIn 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.
2. Climate ConsiderationsĊExposure 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.
3. Occupancy ConsiderationsĊA 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
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.
OWNER REMINDER! Be sure the system installer has re-
corded the zoning information in Table 1 on page 6 and
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.
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.
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.