Component Selection; Typical System Layout - Lennox HARMONY III Manual

COMPONENT SELECTION

START
Lennox Indoor Unit
Equipped with Variable
Speed Blower
(Gas Furnace with Indoor
Coil or Air Handler Unit)
TRANSFORMER
(see page 6 for
selection)
ZONE
THERMOSTAT
One per zone
(See Page 6)

TYPICAL SYSTEM LAYOUT

ZONE 2
ZONE 2
THERMOSTAT
ZONE
DAMPER
ZONE
DAMPER
ZONE 3
THERMOSTAT
ZONE 3
Lennox Single Speed
Air Conditioner or Heat Pump Outdoor Unit
For zone system with two equal size zones
Lennox Two-Stage
Air Conditioner or Heat Pump Outdoor Unit
For two, three or four, zone systems
Pressure Switch
(Heat Pump Applications Only)
(27W13) - R-410A
ZONE DAMPERS
at least one per zone
(See Page 6)
ZONE 1
ZONE 1
THERMOSTAT
ZONE
DAMPER
ZONE
DAMPER
ZONE 4
THERMOSTAT
ZONE 4
Harmony III
Panel with
Discharge
Air Sensor
(X9953)
Defrost Tempering
Switch (Optional for
Dual-Fuel Heat Pump
applications Only)
(67M41)
®
Humiditrol Zoning
Accessory
(EDA Applications Only)
(39W67)
SUPPLY
HEATING/
COOLING
UNIT
AIR
DISCHARGE
AIR SENSOR
TRANSFORMER
Harmony III Zoning System / Page 7
Balance Point Sensor
(Heat Pump
applications Only)
(56A87)
STOP
RETURN
AIR
ZONE
CONTROL
PANEL