Lennox Harmony III Manual

Harmony III Zoning System / Page 8
FIELD WIRING
COIL
ZONE
DAMPER
VARIABLE
SPEED
FURNACE
OR AIR
HANDLER
ZONE 1
ZONE 2
*ZONE 3
*ZONE 4
POWER
THERMOSTAT
(ZONE 1 or
CENTRAL
CONTROL
thermostat when
in Vacation Mode)
ZONE
DAMPER
THERMOSTAT
(ZONE)
AIR
CONDITIONER
OR
HEAT PUMP
OUTDOOR
UNIT
ZONE
DAMPER
ZONE
DAMPER
F
TRANSFORMER to
power Zone Control
Board, Thermostats
and Dampers; also
powers HZA board
when EDA is used)
THERMOSTAT
(ZONE)
THERMOSTAT
(ZONE)
A − Five wire low voltage − 18 ga. minimum
B −Two wire low voltage − 18 ga. minimum
C − Up to nine wire low voltage − 18 ga. minimum
D −Two wire low voltage (single-stage air conditioner or
EDA) 18 ga. minimum
− Three wire low voltage (two-stage air conditioner)
18 ga. minimum
− Up to seven wire low voltage (single-stage heat
pump outdoor unit) 18 ga. minimum
− Up to eight wire low voltage (two-stage heat pump
outdoor unit) 18 ga. minimum
E−−Two wire low voltage (discharge air sensor) − 18 ga.
minimum
F−−Two wire low voltage − pressure switch (heat pump only
)
− 18 ga. minimum
G −Two wire − 18 ga. minimum
OUTDOOR
THERMOSTAT /
BALANCE
POINT SENSOR
ZONE
CONTROL
SYSTEM
BOARD
A
B
B
A
A
B
B
B
A
E
C
D
G
OPTIONAL
HZA
BOARD
B
D
NOTE − Zone 3 and zone 4 not available with single-stage outdoor unit.

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English