Lennox Harmony III Installation Instructions

GENERAL
Page 3
HARMONY IIIT ZONE CONTROL SYSTEM
Residential Zone Control System − Overview of Field Wiring
VARIABLE SPEED
FURNACE OR AIR
HANDLER
ZONE 1
ZONE 2
*ZONE 4
POWER
THERMOSTAT (ZONE 1 OR CENTRAL CONTROL
THERMOSTAT WHEN IN VACATION MODE)
ZONE DAMPER
THERMOSTAT
(ZONE)
CONDENSING
UNIT OR HEAT
PUMP OUT-
DOOR UNIT
TRANSFORMER TO POWER
ZONE CONTROL PANEL, THER-
MOSTATS AND DAMPERS;
ALSO POWERS HZA CONTROL
WHEN EDA IS USED)
THERMOSTAT
(ZONE)
LEGEND −
A Five wire low voltage  18 ga. minimum
B Two wire low voltage OR Three wire if Power−open, Power−closed  18 ga. minimum
C INDOOR UNIT: Up to nine wire low voltage  18 ga. minimum
D OUTDOOR UNIT:
− Two (3, if LSOM equipped unit) wire low voltage (single-stage condensing unit or EDA) 18 ga. minimum
− Three (4, if LSOM equipped unit) wire low voltage (two-stage condensing unit) 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
H Refer to the Humiditrol® Zoning Accessory (HZA) for wiring requirements.
*NOTE − Zone 3 and zone 4 not available with single-stage outdoor unit.
OUTDOOR
THERMOSTAT /
BALANCE
POINT SENSOR
ZONE CONTROL
SYSTEM PANEL
A
B
DISCHARGE
AIR SENSOR
E
C
D
F
ZONE DAMPER
G
*ZONE 3
THERMOSTAT
(ZONE)
ZONE DAMPER
ZONE DAMPER
HUMIDITROL
®
ENHANCED
DEHUMIDIFICATION
ACCESSORY
HUMIDITROL
®
ZONING
ACCESSORY (HZA)
OPTIONAL
H
A
B
B
A
B
A
B

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English