Lennox Harmony III Manual

Harmony III Zoning System / Page 5
OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA
CONTROLS
Transformer
24VAC transformer is required for operation of Zone
Control Panel, thermostats and zone dampers.
Transformer size is determined by the total power
requirements of the control panel, thermostats and
damper.
See page 6 for ordering information.
Zone Control Panel and Thermostats require 10VA
Dampers require 10VA each.
Balance Point Sensor
Used to lock out the heat pump at low ambient
conditions (below the system balance point).
Defrost Tempering Kit
For dual-fuel heat pump applications. Used to temper
the indoor air during the defrost cycle.
Pressure Switches
A pressure switch is required for applications with a
Lennox heat pump.
Guards against high head pressures during rst- and
second-stage heating.
DAMPERS
Zone Dampers
Any style 24VAC damper is
compatible with the Harmony
III™ Zoning System.
Spring-open/power-close
dampers are the preferred,
however, power-open/spring-
close and power-open/power-
close dampers can be used.
At least one damper per zone is required.
Up to 5 dampers per zone may be connected in parallel
to the Harmony Panel, not to exceed a total of six
dampers for entire system. If additional dampers are
required, refer to the special wiring diagram in the
Installation Instructions for additional information.
See page 6 for ordering information.
ZONE THERMOSTATS
A single-stage, non-heat pump, non-power-robbing
electronic thermostat is required for each zone.
Each thermostat must have a dead band between
HEAT and COOL. In central control mode, the zone
1 thermostat is designated as the master thermostat
and it controls the entire house. The other thermostats
are not used. Lennox recommends that the zone 1
(master) thermostat be programmable. Individual
zone thermostats can also be programmable. For all
zones, use single-stage, electronic, non-heat pump
thermostats.
Recommended thermostats include ComfortSense
®
7500, 5500 and 3000 Series Thermostats. See
Controls Section and Lennox Price Book for additional
thermostats.
ComfortSense
®
7500 Touchscreen Fully
Programmable Thermostat
4 Heat/2 Cool
7 Day programmable.
Auto-changeover
Easy-to-use, touch screen
thermostat.
See the Product
Specications bulletin in
the Controls section for
more information.
ComfortSense
®
5500 Touchscreen Fully
Programmable Thermostat
1 Heat/1 Cool
7 Day programmable.
Easy-to-use, touch screen
thermostat.
See the Product
Specications bulletins in
the Controls section for
more information.
ComfortSense
®
3000 5-2 Day Programmable and
Non-Programmable Thermostats
1 Heat/1 Cool
Easy-to-use
5-2 Day programmable or
non-programmable models
available.
See the Product
Specications bulletins in
the Controls section for
more information.

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English