Lennox Harmony II Zone Control System User manual

Page 1
06/06 502,861M
*2P0606* *P502861M*
2006 Lennox Industries Inc.
Dallas, Texas, USA
Zone System
Control Center
(cover removed)
Zone System
Control Center
(cover in place)
Harmony®II Zone System Control Panel
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
Harmony®II Zone Control
System
CONTROLS
502,861M
06/06
Supersedes 02/2000
Table of Contents
Introduction 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Residential Zone Control System − Field Wiring 2. . .
Residential Zone Control System Dimensions 3. . . .
Component Selection:
Gas Heat/Condensing Unit Systems 4. . . . . . . . . . .
Heat Pump (HP) System 5. . . . . . . . . . . . . . . . . . . . .
Gas Heat/HP Sys. W/FM21 Heat Pump Control 6.
System Components 7. . . . . . . . . . . . . . . . . . . . . . . . . .
System Design Guidelines 8. . . . . . . . . . . . . . . . . . . . . .
Heat/Cool Equipment Options & Installation 10. . . . . . .
Component Selection & Installation 10. . . . . . . . . . . . . .
Blower Speed Adjustments 12. . . . . . . . . . . . . . . . . . . . .
Control Center Jumper Settings 15. . . . . . . . . . . . . . . . .
Common System Component Wiring 14. . . . . . . . . . . .
Component Specific Wiring 18. . . . . . . . . . . . . . . . . . . . .
Option 1 Field Wiring Diagram 22. . . . . . . . . . . . . . . . . .
Option 2 Field Wiring Diagram 23. . . . . . . . . . . . . . . . . .
Option 3 Field Wiring Diagram 24. . . . . . . . . . . . . . . . . .
Opt. 1 W/Economizer Option Field Wiring Diagram 25
Opt. 2 W/Economizer Option Field Wiring Diagram 26
System Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Lights 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic/Bypass Button 29. . . . . . . . . . . . . . . . . . . . . .
Time Delays 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
New System Start−Up & Checkout 30. . . . . . . . . . . . . . .
Troubleshooting 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping & Packing List
Harmony®II Zone Control System
1 − Control center
1 − Control panel
1 − Discharge air probe
Additional Items
1 − Dampers and transformers
1 − Thermostat zone
Heat Pump Option
1 − Pressure switch (#21J18)
G32V Option
1 − Temperature modulator switch (#72H45)
Economizer Optional
1 − Heat pump (#69J5701)
1 − Furnace relay/air conditioner relay (P−8−3251)
Litho U.S.A.

Page 2
Introduction
The Lennox Harmony®II Zone Control System manages the
distribution of conditioned air to specific areas or zones in a
house or small commercial building.
The zone control system allows the user to heat or cool occu-
pied areas without conditioning unused areas, which may re-
sult in lower utility bills. This control orchestrates the system
components to provide a balanced and comfortable environ-
ment.
The Harmony®II zone control system operates with any of the
following HVAC system combinations:
Option 1 − G32V/G21V/GSR21V series furnace and either
a single− or two− speed condensing unit
Option 2 − CB31MV series blower coil unit and either a Len-
nox single− or two− speed heat pump or air conditioner.
Option 3 − G32V/G21V/GSR21V series furnace, a Lennox
heat pump, and the FM21 control
The Harmony®II zone control system uses off−the−shelf
thermostats and dampers with any of the above options to
distribute conditioned air to different zones. Without this
control, a homeowner would have to purchase multiple
HVAC systems to condition different areas of a residence.
The zone control system operates in two modes: Central
Control mode or Zone Control mode. Based upon a de-
mand from the master thermostat, the Central Control mode
allows the heating and cooling system to condition all of the
zones. When the zone control system is in the Zone Control
mode, a zone is conditioned only upon demand. The Har-
mony®II control panel uses light emitting diodes (LEDs) to
indicate the current operating mode.
The zone control system is easy to install. The wiring to the
control center is all low voltage; therefore, use ordinary 18
AWG thermostat wire. The zone control system is ideal for
retrofit as well as new construction. The zone control sys-
tem controls the air volume of the blower, which eliminates
the need for bypass dampers and discharge temperature
limit switches.
Operating the zone control system is simple. The user oper-
ates the system with the control panel and the zone thermo-
stats. The Harmony®II control panel does not require pro-
gramming. However, a programmable thermostat is
available which allows the user to choose a specialized heat-
ing and cooling sequence. While in zone mode, a standard
thermostat controls the temperature for its particular zone.
There is no over−riding or reprogramming to condition the
zone.
Harmony®II Residential Zone Control System − Field Wiring
COIL
ZONE
SYSTEM
CONTROL
PANEL
ZONE
DAMPER
G21V /
GSR21V
FURNACE
OR
CB31MV
BLOWER
COIL UNIT
ZONE 1 ZONE 2
*ZONE 3 *ZONE 4
POWER
* NOTE  Zone 3 and Zone 4 Not Available
With Single Speed Outdoor Unit.
THERMOSTAT
(MASTER)
ZONE
SYSTEM
CONTROL
CENTER
ZONE
DAMPER
THERMOSTAT
(ZONE)
CONDENSING
UNIT
OR
HEAT PUMP
OUTDOOR
UNIT
ZONE
DAMPER
ZONE
DAMPER
A
A
A
A
B
B
B
B
C
D
G
B
ZONE DAMPER
TRANSFORMER
THERMOSTAT
(ZONE)
THERMOSTAT
(ZONE)
E
F
FM21
PLENUM MOUNTED
DISCHARGE PROBE
HI
J
FUEL MASTER
1ST STAGE HP =10 WIRE
2ND STAGE HP = 12 WIRE
OUTDOOR
THERMOSTAT
A − Three wire low voltage (gas heat systems)  18 ga. minimum
Five wire low voltage (heat pump systems)  18 ga. minimum
B − Two wire low voltage  18 ga. minimum
C − Seven wire low voltage  18 ga. minimum
D − Six wire low voltage  18 ga. minimum
E − Two wire low voltage (single speed condensing unit) 18 ga. minimum
Three wire low voltage (two speed condensing unit) 18 ga. minimum
Four wire low voltage (single speed heat pump outdoor unit) 18 ga. minimum
Five wire low voltage (two speed heat pump outdoor unit) 18 ga. minimum
F − Two wire low voltage (discharge air sensor) 18 ga. minimum
G − Two wire low voltage  pressure switch (heat pump only)  18 ga. minimum
H − Eight wire  18 ga. minimum
I − Three wire  18 ga. minimum
J − Two wire  18 ga. minimum

Page 3
Harmony®II Zone Control System Dimensions
−
3/8 5/8
1-5/16
Top View
MOUNTING
BASE
10
1
1
1
1
10
4
1
13-1/8
5
3/8
27/32
1
4
Top View
Front View
ELECTRICAL INLETS
(Top and Bottom) MOUNTING
KEYHOLE SLOTS (4)
1-3/4
Control Panel Control Center
Harmony II
3-1/2
4-3/4
2-3/8
2-3/8
5/16
7/16
Front View
MOUNTING
HOLE
(16)
(10)
(33)
(254)
(25) (25)
(25)
(25)
(44)
(121)
(60) (8)
(90)
(60)
(11)
(333)
(21)
(25) (25)
(254)
(102) (102)
(127)
(10)
Inches (mm)
or Gas

Page 4
Harmony®II Residential Zone Control System − Component Selection
(Gas Heat/Condensing Unit Systems)
STOP
ROUND
ZONE DAMPERS
RECTANGULAR
ZONE DAMPERS
NO
DAMPER
TRANSFORMER
up to 5 Dampers
(87344) 45VA
ECONOMIZER
DAMPERS
EMD14-65 or
EMD14M-65
ECONOMIZER
DAMPERS
WIRING HARNESS
120 volts (14H57)
ELECTRONIC AIR
CLEANER
EAC17-14 (75H10)
EAC17-14SQ (75H11)
EAC17-20 (75H12)
ZONE
THERMOSTAT
(One Required
For Each
Additional Zone)
TWO ZONES
TWO, THREE
OR FOUR
ZONES
SINGLE SPEED
CONDENSING UNIT
HS26
HS27
HS29
10ACB
TWO-SPEED
CONDENSING UNIT
HS21
CONTROL
CENTER
(16J95)
START
UP-FLOW
HORIZONTAL OR
DOWN-FLOW
UP-FLOW
FURNACE
G21V SERIES
OR
G32V SERIES
W/ EVAP. COIL
HORIZONTAL OR
DOWN-FLOW
FURNACE
GSR21V SERIES
W/ EVAP. COIL
GAS
HEAT/
CONDENSING
UNIT
NO
CONTROL
PANEL
(16J96)
DISCHARGE AIR
SENSOR PROBE
(16J98)
ZONE 1
MASTER
THERMOSTAT
TEMPERATURE
MODULATION
SWITCH
(72H45)
G32V Only
NO
RECOMMENDED MASTER THERMOSTATS
(For a complete selection of alternate thermostats, see
Thermostats Bulletin in Accessories section.)
Catalog
Description No.
*1 Htg.-1 Clg. 7 Day Programmable 90J38. . . . . . . . . . . . . . . . .
1 Htg.-1 Clg. 5-2 Day Programmable 18H10. . . . . . . . . . . . . . . . .
1 Htg.-1 Clg. 7 Day Programmable 18H11. . . . . . . . . . . . . . . . . .
1 Htg.-1 Clg. 5-1-1 Day Programmable 27H31. . . . . . . . . . . . . . .
1 Htg.-1 Clg. Set Back Day Programmable 90J34. . . . . . . . . . .
*Recommended master thermostat.
RECOMMENDED MASTER THERMOSTATS
(For a complete selection of alternate thermostats, see
Thermostats Bulletin in Accessories section.)
Catalog
Description No.
*1 Htg.-1 Clg. 7 Day Programmable 90J38. . . . . . . . . . . . . . . . .
1 Htg.-1 Clg. 5-2 Day Programmable 18H10. . . . . . . . . . . . . . . . .
1 Htg.-1 Clg. 7 Day Programmable 18H11. . . . . . . . . . . . . . . . . .
1 Htg.-1 Clg. 5-1-1 Day Programmable 27H31. . . . . . . . . . . . . . .
1 Htg.-1 Clg. Set Back Day Programmable 90J34. . . . . . . . . . .
*Recommended master thermostat.
RECTANGULAR DAMPERS
Catalog
Description No.
10 in. x 8 in. (254 x 203 mm) 78G04. . . . . . . . . . . . . . . . . . . . . . . .
12 in. x 8 in. (305 x 203 mm) 78G05. . . . . . . . . . . . . . . . . . . . . . . .
14 in. x 8 in. (356 x 203 mm) 78G06. . . . . . . . . . . . . . . . . . . . . . . .
16 in. x 8 in. (406 x 203 mm) 78G07. . . . . . . . . . . . . . . . . . . . . . . .
18 in. x 8 in. (457 x 203 mm) 78G08. . . . . . . . . . . . . . . . . . . . . . . .
20 in. x 8 in. (508 x 203 mm) 78G09. . . . . . . . . . . . . . . . . . . . . . . .
ROUND DAMPERS
Catalog
Description No.
6 in. (152 mm) dia. 77G99. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 in. (203 mm) dia. 78G00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 in. (254 mm) dia. 78G01. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 in. (305 mm) dia. 78G02. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14 in. (356 mm) dia. 78G03. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ZONE DAMPERS

Page 5
Harmony®II Residential Zone Control System − Component Selection
(Heat Pump Systems)
STOP
ROUND
ZONE DAMPERS
RECTANGULAR
ZONE DAMPERS
NO
NO
DAMPER
TRANSFORMER
up to 5 Dampers
(87344) 45VA
ECONOMIZER
DAMPERS
EMD14-65 or
EMD14M-65
ECONOMIZER
DAMPERS
WIRING HARNESS
120 volts (14H57)
ELECTRONIC AIR
CLEANER
EAC17-14 (75H10)
EAC17-14SQ (75H11)
EAC17-20 (75H12)
ZONE
THERMOSTAT
(One Required
For Each
Additional Zone)
ZONE 1
MASTER
THERMOSTAT
DISCHARGE AIR
SENSOR PROBE
(16J98)
START MULTI-POSITION
TWO ZONES
TWO, THREE
OR FOUR
ZONES
SINGLE SPEED
OUTDOOR UNIT
HP26
HP27
HP29
10HPB
12HPB
MULTI-POSITION
BLOWER COIL
CB31MV SERIES
HEAT PUMP
SYSTEM
PRESSURE
SWITCH
(21J18)
CONTROL
CENTER
(16J95)
TWO-SPEED
OUTDOOR UNIT
HP21
CONTROL
PANEL
(16J96)
Catalog
Description No.
*2 Htg.-1 Clg. 7 Day Programmable 91H72. . . . . . . . . . . . . . . . . .
3 Htg.-2 Clg. 7 Day Programmable 18H13. . . . . . . . . . . . . . . . . . .
3 Htg.-2 Clg. Digital Setpoint 13K97. . . . . . . . . . . . . . . . . . . . . . . .
2 Htg.-1 Clg. 5-1-1 Day Programmable 27H30. . . . . . . . . . . . . . .
**2 Htg.-1 Clg. Electro−mechanical w/ Subbase 51H40. . . . . . . .
*Recommended programmable master thermostat or zone thermostat.
**Recommended electro−mechanical zone thermostat.
ROUND DAMPERS
Catalog
Description No.
6 in. (152 mm) dia. 77G99. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 in. (203 mm) dia. 78G00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 in. (254 mm) dia. 78G01. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 in. (305 mm) dia. 78G02. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14 in. (356 mm) dia. 78G03. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECTANGULAR DAMPERS
Catalog
Description No.
10 in. x 8 in. (254 x 203 mm) 78G04. . . . . . . . . . . . . . . . . . . . . . . .
12 in. x 8 in. (305 x 203 mm) 78G05. . . . . . . . . . . . . . . . . . . . . . . .
14 in. x 8 in. (356 x 203 mm) 78G06. . . . . . . . . . . . . . . . . . . . . . . .
16 in. x 8 in. (406 x 203 mm) 78G07. . . . . . . . . . . . . . . . . . . . . . . .
18 in. x 8 in. (457 x 203 mm) 78G08. . . . . . . . . . . . . . . . . . . . . . . .
20 in. x 8 in. (508 x 203 mm) 78G09. . . . . . . . . . . . . . . . . . . . . . . .
RECOMMENDED THERMOSTATS
(For a complete selection of alternate thermostats, see
Thermostats Bulletin in Accessories section.)
ZONE DAMPERS

Page 6
Harmony®II Zone Residential Control System − Component Selection
(Gas Heat/Heat Pump Systems With FM21 Heat Pump Control)
CONTROL
CENTER
(16J95)
STOP
ROUND
ZONE DAMPERS
RECTANGULAR
ZONE DAMPERS
NO
DAMPER
TRANSFORMER
up to 5 Dampers
(87344) 45VA
ECONOMIZER
DAMPERS
EMD14-65 or
EMD14M-65
ECONOMIZER
DAMPERS
WIRING HARNESS
120 volts (14H57)
ELECTRONIC AIR
CLEANER
EAC17-14 (75H10)
EAC17-14SQ
(75H11)
EAC17-20 (75H12)
ZONE
THERMOSTAT
(One Required
For Each
Additional Zone)
ZONE 1
MASTER
THERMOSTAT
DISCHARGE
AIR SENSOR
PROBE
(16J98)
CONTROL
PANEL
(16J96)
TWO ZONES
TWO, THREE
OR FOUR ZONES
SINGLE SPEED
OUTDOOR UNIT
HP26
HP27
HP29
10HPB
12HPB
NO
TWO-SPEED
OUTDOOR UNIT
HP21
FM21 HEAT
PUMP
CONTROL
(16J92)
PRESSURE
SWITCH
(21J18)
DEFROST AIR
TEMPERING
MODULE
(16J93)
SERVICE
LIGHT
MODULE
(16J94)
OUTDOOR
THERMOSTAT
NO
NO
START
GAS HEAT/
HEAT PUMP
SYSTEM
HORIZONTAL OR
DOWN-FLOW
UP-FLOW
FURNACE
G21V SERIES
OR
G32V SERIES
W/ EVAP. COIL
HORIZONTAL OR
DOWN-FLOW
FURNACE
GSR21V SERIES
W/ EVAP. COIL
NO
TEMPERATURE
MODULATION
SWITCH
(72H45)
G32V Only
NO
RECOMMENDED THERMOSTATS
Catalog
Description No.
*2 Htg.-1 Clg. 7 Day Programmable 91H72. . . . . . . . . . . .
3 Htg.-2 Clg. 7 Day Programmable 18H13. . . . . . . . . . . . .
3 Htg.-2 Clg. Digital Setpoint 13K97. . . . . . . . . . . . . . . . . .
2 Htg.-1 Clg. 5-1-1 Day Programmable 27H30. . . . . . . . .
**2 Htg.-1 Clg. Electro-mechanical w/ subbase 51H40. . . . .
ZONE DAMPERS
ROUND DAMPERS
Catalog
Description No.
6 in. (152 mm) dia. 77G99. . . . . . . . . . . . . . . . . . . . . . . .
8 in. (203 mm) dia. 78G00. . . . . . . . . . . . . . . . . . . . . . . . .
10 in. (254 mm) dia. 78G01. . . . . . . . . . . . . . . . . . . . . . . . .
12 in. (305 mm) dia. 78G02. . . . . . . . . . . . . . . . . . . . . . . . .
14 in. (356 mm) dia. 78G03. . . . . . . . . . . . . . . . . . . . . . . . .
ZONE DAMPERS
RECTANGULAR DAMPERS
Catalog
Description No.
10 x 8 in. (254 x 203 mm) 78G04. . . . . . . . . . . . . . . . . . . . .
12 x 8 in. (305 x 203 mm) 78G05. . . . . . . . . . . . . . . . . . . . .
14 x 8 in. (356 x 203 mm) 78G06. . . . . . . . . . . . . . . . . . . . .
16 x 8 in. (406 x 203 mm) 78G07. . . . . . . . . . . . . . . . . . . . .
18 x 8 in. (457 x 203 mm) 78G08. . . . . . . . . . . . . . . . . . . . .
20 x 8 in. (508 x 203 mm) 78G09. . . . . . . . . . . . . . . . . . . . .

Page 7
System Components
Harmony®II Control Components
Control Panel (Figure 1)The user selects the mode of
operation on the Harmony®II control panel. Raised but-
tons and corresponding LEDs for each mode are on the
control panel.
Control Center (Figure 2)The control center is the brain"
of the zone control system. The control organizes the opera-
tion of the thermostats, dampers, and HVAC equipment for to-
tal comfort.
Other System Components (Ordered Separately)
ThermostatsThermostats are required for each zone and
may be programmable or conventional but must have a dead
band between HEAT and COOL. In Central Control mode, the
zone 1 thermostat is designated as the master thermostat.
The other thermostats are not used. In the Zone Control
mode, the unused zones are referred to as zone 2, zone 3,
and zone 4.
Dampers and Damper TransformerMotorized damp-
ers are used in the supply duct system to allow air distribu-
tion to the zones. The dampers use 24VAC to close and
spring−return to open.
The dampers are powered by a separate, field−provided
24VAC transformer. The transformer must have an ade-
quate VA rating for the number of operating dampers.
Discharge Air Temperature ProbeA discharge air tem-
perature probe or sensor monitors the supply air. This
probe gathers temperature information across the air
stream. It is not a limit switch.
Pressure SwitchA pressure switch is required for ap-
plications with a Lennox heat pump (Options 2 and 3). The
pressure switch acts as a safety device in case of high
head pressures during first− and second−stage heating.
Temperature Modulation SwitchWhen applying the
Harmony®II zone control system to the G32V furnace (op-
tions 1 and 3), you must install a temperature modulation
switch. The switch senses the temperature of the supply
air. Based on that air temperature, the switch will allow the
gas valve to change from high fire to low fire or from low fire
to high fire. The normally closed switch (72 H45) is not sup-
plied with the zoning control or with the furnace and must
be ordered separately.
Harmony®II Control Panel
Figure 1
Harmony®II Control Center
or Gas
−
or Gas
Discharge/
Bypass But-
ton
Figure 2

Page 8
System Design Guidelines
Designing a duct system for a Harmony®II zoning applica-
tion is similar to non−zoned duct design, but with a few extra
considerations. Certain decisions must be made before
ducts, dampers, supply registers, return grilles, and ther-
mostats are installed. This section is a general guide to de-
termine how to group rooms into zones. Refer to ACCA
Manual D for detailed duct design guidelines. ACCA
Manual G helps in selecting which design is best for a given
application.
A−Zoning Considerations
Structural/Architectural
Overheating may occur in the second story of multi−level
houses that use regular HVAC systems. Because heated
air rises to the second floor, these second story rooms be-
come too hot. Zoning will remedy this situation by splitting
the conditioned space into two specific zones (first and
second floors). The second floor temperature is now con-
trolled by its own thermostat, not that of the first floor.
never group rooms on different levels into the same
zone
all zones should be roughly equal in load
Climate
Overheating and undercooling because of weather
changes are problems associated with homes that are
conditioned by one thermostat. Zoning reduces overheat-
ing and undercooling by grouping rooms with the same di-
rectional exposure into one zone. Therefore, a room with a
northern exposure and a room with a southern exposure
should not be zoned together. During the winter, the north-
ern 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 directional expo-
sure.
Never group rooms with opposite directional expo-
sures into the same zone.
Occupancy
A single structure contains different types of living spaces.
Without zoning, it is difficult to condition those areas so that
everyone will be comfortable. Zoning a home or office al-
lows the user to control the zones which need to be condi-
tioned.
Rooms that are used or occupied at the same time should be
zoned together. For instance, bedrooms which are generally
occupied at night, should not be zoned with a living room that
is used only during the day or evening.
Never group rooms that are not usually occupied at the
same time into the same zone.
B−Standard Zone Duct Systems
The Harmony®II zone control system allows independent
zone conditioning for up to four areas in a house or build-
ing. Ideally, a four zone system will use four trunks, each
with one damper. However, the existing duct system in
some retrofit applications may not have been designed for
zoning. In these cases, the duct system must be modified
either with new duct or extra dampers to ensure that each
zone is isolated from the others.
In new construction, it is recommended that each zone
have its own return air register. This will better isolate each
zone and prevent air from mixing. In retrofit applications
with few return registers, there may be a tendency for air to
mix between zones. If this is the case, install extra return
registers.
Designing Ducts for the Harmony®II Zone Control
System
1− Perform a standard heat/cool load calculation of the
home or office.
2− Keeping the previous calculations in mind, determine
which rooms will be grouped into each zone.
3− From the load calculation, determine the cfm at each reg-
ister. For each zone, add the cfm from the registers. No
one zone should have less than 20−25% of total cfm.
4− Using ACCA guidelines and work sheets, choose the best
duct system design. Duct layout will depend on the struc-
ture of the building and the region of the country. Figures
3 and 4 show applications of reduced radial and extended
plenum systems.

Page 9
Typical Reduced Radial Zone Duct Design
Laundry
Room
Kitchen Bath #1 Bedroom
#2
Bedroom
#3
Bath #1
Master
Bedroom
Living
Room
Dining
Area
Front Door
Back Door
Zone
Dampers
Zone 1
Return Register
Zone 4
Return Register
Zone 4
Thermostat
Zone 2
Thermostat
Zone 1
Return Register
Zone 3
Return Register
Zone 3 Thermostat
Zone Control
Panel
Zone 1
Thermostat
Zone
Dampers
Figure 3
Furnace
Zone 2
Return Register
Typical Extended Plenum Zone Duct Design
Laundry
Room
Kitchen Bath #1 Bedroom
#2
Bedroom
#3
Bath #1
Master
Bedroom
Living
Room
Dining
Area
Front Door
Back Door
Zone 2
Zone 4Zone 3
Zone Dampers
Zone 1
Return
Register
Zone 2
Return
Register
Zone 4
Return
Register
Zone 4
Thermostat
Zone 2
Thermostat
Zone 1
Return Register
Zone 3
Return Register
Zone 3 Thermostat
Zone
Control
Panel
Zone 1
Thermostat
Zone
Dampers
Figure 4
Zone 1

Page 10
Heat/Cool Equip. Options & Installation
Option 1 − Gas Furnace (with VSM) & Condens-
ing Unit
G32V/G21V/GSR21V Series Gas Furnace
The G32V/G21V (upflow) and the GSR21V (horizontal/re-
verse−flow) are high efficiency gas furnaces that employ a
variable speed blower motor (VSM). The VSM allows the
zone control system to distribute the amount of air that
goes to each zone. These are the only furnaces available
that work with the Harmony®II zoning system. See instal-
lation instructions for the G32V, G21V, or GSR21V, which
are provided with the furnace.
Condensing Unit
Any Lennox condensing unit may be used with the Harmo-
ny®II zone control system. If a single−speed condensing
unit is used, only two zones are allowed. To reach the full
benefit of the system, a two−speed condensing unit should
be used, which allows up to four zones.
Install the condensing unit as outlined in the installation in-
structions provided with the unit. Install the matching evapora-
tor coil according to the installation instructions furnished with
the coil. The total HVAC system must be properly proportioned
to provide the best comfort.
Option 2 − Blower coil unit (with VSM) & Lennox
Heat Pump
CB31MV Series Blower Coil Unit
The CB31MV (upflow/reverse-flow/horizontal) blower coil
units are equipped with a variable speed blower motor
(VSM) which allows the zoning system to proportion the
amount of air going to each zone. This is the only blower
coil unit that may be used with the Harmony®II control sys-
tem. Refer to the CB31MV installation instructions, pro-
vided with the unit, for installation procedures.
Lennox Heat Pump Unit
Any Lennox heat pump unit may be used with the Harmo-
ny®II zone control. If a single−speed heat pump is used,
only two zones are allowed. To reach the full benefit of the
zone control system, a two−speed heat pump should be
used, which allows up to four zones.
Install the heat pump as outlined in the installation instruc-
tions provided with the unit. The total HVAC system must be
properly proportioned to provide the best comfort.
Option 3 − Gas Furnace (with VSM) Lennox Heat
Pump, & FM21 Control
G32V/G21V/GSR21V Series Gas Furnace
The G32V/G21V (upflow) and the GSR21V (horizontal/re-
verse−flow) are high efficiency gas furnaces that employ a
variable speed blower motor (VSM) which allows the zone
control system to distribute the amount of air that goes to
each zone. These are the only furnaces available that work
with the Harmony®II zoning system. See the installation
instructions for the G32V, G21V, or GSR21V which are pro-
vided with the furnace.
Lennox Heat Pump Unit
Any Lennox heat pump unit may be used with the Harmo-
ny®II zone control system. If a single−speed heat pump is
used, only two zones are allowed. To reach the full benefit
of the system, a two−speed heat pump should be used,
which allows up to four zones.
Install the heat pump as outlined in the installation instruc-
tions provided with the unit. The total HVAC system must be
properly proportioned to provide the best comfort.
Lennox FM21 Control
The FM21 control coordinates the operation of any Lennox
heat pump and a G32V, G21V, or GSR21V furnace to supply
the different stages of heat. Two optional kits are available for
use with the FM21: the SLC1−service light kit and the
DTR1−defrost kit. Refer to the FM21, SLC1, and/or DTR1 in-
structions for installation and operation sequences.
Component Selection & Installation
A − Control Panel
Install the Harmony®II control panel so that it is accessible to
the user. Typically, locate the control panel near the zone 1
master thermostat.
Harmony®II Control Panel
Figure 5
CAUTION
Do not damage the PC board as you install the con-
trol panel.
1− Remove the cover of the control panel by holding the
base section and gently pulling the cover out at the bot-
tom. Pivot the cover up and lift it away from the base.
2− Drill two holes to accommodate the anchors that will
hold the control panel. Use a saw or sheetrock knife to
cut out a rectangular section of the wall. You will run the
thermostat cable from the control center to the control
panel through this section.
3− Insert two plastic anchors into the wall.
4− Attach a six−wire thermostat cable to the terminal block
which is located on the back of the system control pan-
el. Identify and mark each of the six wires (1, 2, 3, 4,
5, and 6) for wiring to the zone control center.
5− Using the provided screws, position the mounting base
and secure it to the wall. Route the thermostat wires
through the opening in the middle of the mounting base.

Page 11
6− Attach the control panel cover to the mounting base.
B − Control Center
Install the Harmony®II control center in a non−condensing
area, such as a closet, but where the temperature will not
exceed 130F. A convenient, central location is necessary
to facilitate the wiring from thermostats, dampers, pres-
sure switch (if used), FM21 (if used), control panel, and
HVAC equipment. The control center mounting box must
be grounded. The electrical power for the zoning control
center and furnace or blower coil unit must be from the
same source. In addition, the Harmony®II control center
power−up must occur at the same time or before the fur-
nace or blower coil unit power−up.
C − Thermostats
In Central Control mode, the zone 1 thermostat is designated
as the master thermostat. The other thermostats are not used.
In the Zone Control mode, the unused zones are referred to as
zone 2, zone 3, and zone 4.
For Option 1 (G32V/G21V/GSR21V and condensing unit), a
single−stage thermostat (1 HEAT/1 COOL) is recommended.
Option 2 (CB31MV and Lennox heat pump) and Option 3
(G32V/G21V/GSR21V, Lennox heat pump, and FM21) re-
quire a two−stage heat pump thermostat (2 HEAT/1COOL).
One of the unique features of the Harmony®II zone control
system is that any conventional or programmable thermo-
stat may be used. However, Lennox recommends that the
zone 1, master thermostat be programmable. Individual
zone thermostats may also be programmable. Refer to the
Lennox engineering handbook for appropriate thermo-
stats.
You may use autochangeover thermostats on all zones.
The fan switch on all thermostats of the zone control sys-
tem is non−functional. You can use non−autochangeover
thermostats, but you must synchronize the thermostat’s
system switch with the current zone mode. For example,
zones 2, 3, and 4 thermostat system switches must be in
Heat for heating to be supplied to those zones.
Locate each thermostat in its zone. If two or more rooms
are within one zone, place the thermostat in a location that
is close to all rooms. For example, if a zone contains two
bedrooms, try to place thermostat in a hallway location
near both bedrooms.
Install thermostats as directed in the thermostat installation
instructions. Do not install thermostats in drafty areas, be-
hind doors or in corners, near radiant heat sources such as
appliances and sunny windows, near concealed pipes and
chimneys, or in unconditioned spaces such as closets or
exterior walls.
D − Dampers
Motorized dampers in the supply duct system allow air to
distribute to the zones. The dampers use 24 VAC to close
and spring−return to open. Rectangular and round damp-
ers are available from Lennox in sizes ranging from 6 inch-
es (152mm) to 14 inches (357mm) (round) and 10 inches
(254mm) x 8 inches (203mm) to 20 inches (508) x 8 inches
(203mm) (rectangular). See Lennox engineering hand-
book for zone damper model numbers.
Each application of the zone control system will be unique
and may require more than one damper per zone. The rec-
ommended damper transformer with zone control center will
handle up to five dampers. If more dampers are needed, a
larger transformer and isolation relays will be necessary. See
the wiring diagram in the Common System Component Wir-
ing section. Refer to the Zone Design section in this manual.
For more effective zone isolation, the return duct system
may also be dampered by zone; the dampers for each
zone must be wired in parallel.
Install dampers in the desired location and run thermostat
wire from the damper to the control center.
E−Damper Transformer
The dampers are powered by a separate, field provided
24VAC transformer. The transformer must have an adequate
VA rating for the number of operating dampers. Minimum VA
rating = 11 x (no. of dampers − 1). For example, a system using
five dampers will need a 24VAC damper transformer with a
rating of at least 44 VA.
Install the damper transformer in an electrical junction box
near the control center.
F−Discharge Air Temperature Probe
1− Locate an area in the discharge plenum downstream
from the cooling coil to install the discharge air temper-
ature probe.
2− Install the probe so that the discharge air passes over
the sensor before the air is distributed into the duct
system.
3− Ensure that the sensor is mounted according to the air-
flow sticker on the mounting plate.
G−Pressure Switch
A pressure switch is only required for applications that use
a heat pump (Option 2 or Option 3). Using the pressure
switch is a safety measure to protect the compressor from
high head pressure during first−stage heating. The Lennox
part number for the pressure switch is 21J18.
NOTE − If pressure switch is factory installed in the unit, do
not remove switch or switch wires.
1− Install the pressure switch with a saddle valve (3/8 inch
or 1/2 inch) in the discharge line between the compres-
sor and the reversing valve.

Page 12
Blower Speed Adjustment
The G21V and GSR21V furnace, and the CB31MV blower
coil unit are equipped with a variable speed blower motor. The
blower motor speed must be adjusted to produce the zoning
CFM requirements managed by the zone control system.
The variable speed motor in the G32V, G21V, or GSR21V is
controlled by the VSP2−1 drive control. The motor in the
CB31MV is controlled by the BDC3 drive control.
The adjustment of these drive controls is by jumper setting
selection and is described in sections A and B.
CAUTION
Electrical Shock Hazard
Disconnect power from unit and wait at least five
minutes to allow capacitors to discharge before at-
tempting to adjust motor speed tap settings.
G32V, G21V, or GSR21V Blower Control Board
Jumper Settings
Locate the VSP2−1 board in the furnace control box area.
The jumper settings on the VSP2−1 board control the blow-
er CFM. See figure 6.
Setting the upper limit of blower CFM −
1− Determine the maximum system CFM requirements
This is the sum of all the individual zones.
2− From the Blower Motor Performance table (see unit
installation instructions) determine the HIGH Speed
(cool) jumper setting that corresponds to this CFM.
3− Set the HIGH Speed (cool) jumper setting on the board
to this value.
Setting the lower limit of blower CFM −
1− Determine the minimum system CFM requirements.
This is the CFM for the smallest zone.
2− From the Blower Motor Performance table determine
the LOW Speed (cool and heat) jumper setting corre-
sponding to this CFM.
3− Set the LOW Speed (cool and heat) jumper setting on
the board to this value.
NOTE − HEAT Speed jumper setting is only used when the
primary limit has been tripped.
NOTE − The HTG BLOWER jumper setting must be set to
position 2.
For more information on setting the blower speed, refer to
section on Blower Speed and Adjustment" in the G32V,
G21V, or GSR21V installation instructions.
CB31MV Blower Control Board Jumper Settings
Locate the BDC3 board in the control box of the CB31V.
The jumper settings on the BDC3 board control the blower
CFM. See figure 7.
Setting the upper limit of blower CFM −
1− Determine the maximum system CFM requirements
This is the sum of all the individual zones.
2− From the Blower Motor Performance table (see unit
installation instructions) determine the COOL Speed
jumper setting that corresponds to this CFM.
3− Set the COOL Speed jumper setting on the board to
this value.
NOTE − The lower limit of blower CFM is factory set. It is not
field adjustable.
For more information on setting blower speed refer to sec-
tion on Blower Speed and Adjustment" in the CB31MV
installation instructions.

Page 13
JP2
HIGH LOW ADJUST HEAT
CFM
HI/LOW
ON/OFF
HEAT
HTG.
BLOWER
12 DS2
DS3
DS1
DS4
1
2
3
4
1
2
3
4
1
2
3
4
TEST
−
+
NORM
210
150
90
270
JP1
VSP2−1 VARIABLE SPEED CONTROL BOARD SELECTIONS
DIAGNOSTIC
DS LEDS
FAN OFF
TIMING PINS
JP2
13 PIN PLUG
(BOARD TO MOTOR)
JP1
15 PIN PLUG
(BOARD TO VARIOUS POINTS IN FUR-
NACE)
HIGH Speed
MAXIMUM CFM
SELECTION
LOW Speed
MINIMUM CFM
SELECTION
PRIMARY LIMIT
TRIPPED CFM
OPERATIONAL
SELECTOR PINS
Affects both High
and Low CFM
1
1
POSITION 2
SELECTION RE-
QUIRED
Figure 6
BDC3 VARIABLE SPEED CONTROL BOARD SELECTIONS
JP1
15 PIN PLUG
(BOARD TO MOTOR)
1
2
3
4
1
2
3
4
1
2
3
4
TEST
−
+
NORM
ADJUST HEAT COOL DELAY CFM RUN
24V/1A
ACC
JP1
ACCESSORY RELAY CONTACTS
(DRIVES OPTIONAL
ACCESSORY RELAY)
OPERATIONAL
SELECTOR PINS
(Affects both heating and cooling
modes)
DIAGNOSTIC
LEDS
FAN DELAY
SELECTOR PINS
MAXIMUM
CFM SELECTION
NOT USED
NOTE − Minimum blower
CFM is not adjustable.
Figure 7

Page 14
Lennox Harmony®II Control Center Terminal Connections and Jumper Blocks
DAMPER
TRANSFORMER
CONNECTION
ZONE DAMPER
CONNECTIONS (4)
INDOOR UNIT
CONNECTIONS
(G32V/G21V/GSR
21V SERIES OR
CB31M SERIES)
OUTDOOR UNIT
CONNECTIONS
(SINGLE− OR
TWO−STAGE
CONDENSING UNIT
OR HEAT PUMP)
INDOOR UNIT CONNEC-
TIONS
(G32V/G21V/GSR21V SE-
RIES OR CB31MV SERIES)
FOUR ZONE
THERMOSTAT
CONNECTIONS
Harmony®II
CONTROL PANEL
CONNECTIONS
HIGH PRESSURE SWITCH
CONNECTIONS
(HEAT PUMP
APPLICATIONS ONLY)
DISCHARGE
TEMPERATURE
PROBE CONNECTIONS
HEAT AIR
REDUCTION
JUMPER PINS
OUTDOOR
UNIT
JUMPER
PINS
DISCHARGE AIR
TEMPERATURE
JUMPER PINS
INDOOR UNIT
JUMPER PINS
CONTINUOUS AIR
REDUCTION
JUMPER PINS
CFM JUMPER PINS
FOR FOUR ZONES
TROUBLESHOOTING
DIAGNOSTIC
RED LIGHTS
(4−LEDs)
DIAGNOSTIC/
BYPASS
BUTTON
2 AMP
SLOW BLOW FUSES
DAMPER LEDs
1ST & 2ND STAGE
COOLING
AND REVERSING
VALVE LEDs
BLOWER & 1ST,
2ND, & 3RD
STAGE HEATING
LEDs
COOLING DEMAND,
REVERSING VALVE, &
HEATING
DEMAND LEDs
FOR EACH ZONE
THERMOSTATS SW1
AIR SELECTION
INDOOR UNIT
TRANSFORMER
INDOOR
UNIT
OUTDOOR
UNIT
CONTINUOUS AIR
REDUCTION
HEATING AIR
REDUCTION
OUTDOOR
UNIT
DISCHARGE AIR
TEMPERATURE
INDOOR
UNIT
G
W1
W2
W3
CONTROL
PANEL
PRESSURE
SWITCH
DISCHARGE
PROBE
HP3
HP2
HP1
G21V
or Gas
H−
C−
H+
C+
1 SPD
2 SPD
40%
20%
75%
50%
0%
24VAC
IN
1DZ
2DZ
3DZ
4DZ
25%
35%
45%
55%
65%
75%
85%
95%
25%
35%
45%
55%
65%
75%
85%
95%
OFF
25%
35%
45%
55%
65%
75%
85%
95%
OFF
25%
35%
45%
55%
65%
75%
85%
95%
OFF
W1
Y1
Y2
O
Y1
Y2
O
W3
W2
W1
G
DS
0%
ZONE 1
ZONE 2
ZONE 3ZONE 4
F2
F1
ZONE 1
ZONE 2ZONE 3
ZONE 4
Y1
O1
W1
C1
W1
O1
Y1
R1
DIAG
DIAG
DIAG
DIAG
1
2
3
4
Y2
O2
W2
C2
W2
O2
Y2
R2
Y3 O3
W3
C3
R3
W3
O3
Y3
Y4
O4
W4
C4
R4
Y4
O4
W4
ZONE 1
ZONE 2
ZONE 3ZONE 4
Figure 8

Page 15
Control Center Jumper Settings
The Lennox Harmony®II control center is designed to ac-
commodate a wide variety of applications. Some set−up is
required to allow the control center to perform in a specific
application. (Only qualified technicians should perform
equipment set−ups.) The control center contains nine
jumper blocks in six areas on the circuit board. The position
of these jumpers determines how the system will function.
See figure 8. The small plastic covered jumpers are in
place when the control is shipped.
To change jumper positions, gently pull the jumper off the
pins and place it on the desired set of pins. If the jumpers
are changed while the equipment is operating, DIAG 2 will
flash and the new operation will immediately take effect. If
the jumper is not needed, it may be stored by placing it on
one pin only so that electrical contact cannot be made. See
figure 9.
Storing Jumpers
STORE JUMPER BY PLACING
IT ON ONE PIN SO THAT
ELECTRICAL CONTACT
CANNOT BE MADE.
PINS
JUMPER
Figure 9
Additional jumpers are available from Lennox as part
#38L94.
CAUTION
Discharge static electricity before touching the Har-
mony®II control center. Static electrical discharge
will damage electronics.
CFM Air Selection Jumpers
The zone control system allows the user to select the ap-
propriate air volume for each zone. The user must select air
volumes for at least zone 1 and one other zone. Unused
zones must have their air selection jumper placed on the OFF
pins. See figure 10. The range of jumper settings is from 25%
to 95%.
ZONE 1
AIR SELECTION
ZONE 2
NOTE−Only zones 2 through 4 have an OFF setting.
AIR SELECTION JUMPER PINS
(located on system control center)
Place jumper on pins that correspond
with the desired CFM.
Pin shown with jumper on 35%.
Pin shown with jumper on 25%.
25%
35%
45%
55%
65%
75%
85%
95%
25%
35%
45%
55%
65%
75%
85%
95%
OFF
Figure 10
To Determine Air Selection Jumper Settings:
1. Use a cooling load analysis to determine the required
CFM for each zone.
2. Determine the minimum CFM for the indoor unit. To
find the CFM, compare the jumper settings on the
unit’s blower control board with the specific furnace or
blower coil blower chart.
3. Calculate the pulse width modulation multiplier (PWM)
using the two values from step 1 and 2:
Formula PWM Multiplier = (Req’d CFM − Min. CFM)
(Max CFM − Min. CFM)
4. Go to figure 11. On the vertical axis, find the PWM you
calculated in step 3. Proceed horizontally to the 0% re-
duction (cooling) line, then down vertically to the hori-
zontal axis. Read the percent air.
5. Set the air selection jumper pin for the zone using the
percent air determined in step 4. If the percent air falls
between available jumper settings, select the next
highest setting.
6. Repeat steps 1−5 for each zone.
Example − 1Given that maximum CFM is 2220 and
minimum CFM is 720, and Zone 1 requires 1020 CFM,
find the total % air for zone 1.
Formula PWM Multiplier = (Req’d CFM − Min. CFM)
(Max CFM − Min. CFM)
Solution PWM Multiplier = (1020−720) = 0.2
(2220−720)
In figure 11, example 1, enter the vertical axis at 0.2,
proceed horizontally to the 0% reduction (cooling) line,
then go vertically down to the horizontal axis and read
40% of air. Since there is no 40% jumper setting, go to
the next higher setting. Then, 45% will be the air selec-
tion jumper setting for this zone. Repeat the calcula-
tion above for all zones to determine each zones multi-
plier.

Page 16
25 7535 45 50 55 60 65 70 80 85 90
Pulse Width Modulation (PWM) Multiplier Chart
Figure 11
0.0
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.0
PULSE WIDTH MODULATION (PWM) MULTIPLIER
PERCENT AIR
(% of Total Air of All Zones Calling)
30 40 95 100
0 %
REDUCTION
(Cooling)
20 %
REDUCTION
(Heating)
40 %
REDUCTION
(Heating)
50 %
REDUCTION
(Continuous Air)
Note − For 75 % reduction use minimum
CFM
EXAMPLE 1
EXAMPLE 2 part 1
EXAMPLE 2 part 2

75%
50%
0%
CONTINUOUS
AIR
REDUCTION
Figure 12
40%
20%
0%
HEATING
AIR
REDUCTION
Figure 13
Page 17
Continuous Air Reduction Jumper
During continuous fan mode with no heating or cooling de-
mand, the blower runs at the total percentage of the CFM
jumpers which cannot exceed 100% of blower capacity.
The continuous air reduction
jumper enables the blower speed
to be reduced by a percentage of
the blower speed during continu-
ous fan mode.
The selections are 75%, 50%, and 0%. The factory places
the jumper on 0%. See figure 12.
Heating Air Reduction Jumper
The heating air reduction jump-
er enables the blower speed,
during heating, to be reduced by
a percentage of the cooling
blower speed.
The selections are 40%, 20% and 0%. Jumper is placed on
0% from the factory. See figure 13.
NOTE − For heat pump applications Option 2 or Option
3, you MUST ALWAYS set the jumper on 0%. High head
pressures may result if air during heating mode is re-
duced. High head pressures may result if air is reduced
during heating mode.
Determine Actual Air Delivered By Blower
The actual CFM delivered to each zone will be deter-
mined by the control center settings, blower motor con-
trol board settings, zone thermostat demand status
[calling for heating, cooling, continuous fan, or no de-
mand (zone damper closed)], and the air distribution
system’s duct size.
When the zone control system is set for a particular
zone jumper, heating reduction jumper, and/or continu-
ous air reduction jumper, determine the total CFM avail-
able from the unit as follows:
1. Determine total unit % air selectionTotal unit %
air selection = (% air of zone 1 + zone 2 + zone 3+
zone 4)
The % air for each zone is the zone jumper setting on the
zone control system board as determined in the preced-
ing section entitled A − CFM Air Selection Jumpers."
NOTE − The % air of each zone is increased by 10%
if the zone is calling for emergency or auxiliary heat.
If total unit % air is calculated as greater than 100%
use 100% in step b.
2. Determine total unit PWM Multiplier using chart
(example 2 in figure 11)If total unit % air is 60%
and heat reduction jumper is set for 20%, enter the
horizontal axis at 60 % air, proceed vertically to the
20% reduction heating line, then go horizontally
across to the vertical axis and read 0.31 PWM Multi-
plier.
3. Determine total unit available CFMTotal unit
available CFM = PWM Multiplier x (Max CFM − Min.
CFM) + Min. CFM.
Again, the maximum and minimum CFM values used in
the formula should correspond to the jumper settings on
the blower control board (PWM Multiplier is as deter-
mined in 2" above).
Example 2
Given − % air of zone 1 = 35; zone 2 = 50; zone 3 = 25;
there is no zone 4; Max CFM = 2220; Min. CFM = 720.
Part 1 − Find total unit available CFM if zones 1 and 3
are calling for heating with heat reduction jumper set
at 20%.
Part 2 −Find total unit available CFM if zones 1 and 3
are calling for cooling (0% reduction).
Solution to part 1
ATotal unit % air selection = (% air of zone 1 +
zone 2 + zone 3+ zone 4) = 35 + 25 = 60.
BIn figure 11 enter the horizontal axis at 60 % air,
proceed vertically to the 20% reduction heating
line, then go horizontally across to the vertical
axis and read 0.31 PWM Multiplier.
CTotal unit available CFM = PWM Multiplier x (Max
CFM − Min. CFM) + Min. CFM = 0.31 x (2220−720)
+ 720 = 1185
Solution to part 2
ATotal unit % air selection = (% air of zone 1 +
zone 2 + zone 3+ zone 4) = 35 + 25 = 60.
BIn figure 11 enter the horizontal axis at 60 % air,
proceed vertically to the 0% reduction cooling
line, then go horizontally across to the vertical
axis and read 0.47 PWM Multiplier.
CTotal unit available CFM = PWM Multiplier x (Max
CFM − Min. CFM) + Min. CFM = 0.47 x (2220−720)
+ 720 = 1425
Indoor Unit Jumper
The indoor unit jumper must be in place to select the
type of heating system that has been installed. For Op-
tion 1, place the jumper on G21V (or GAS). For Option 2,
place jumper on the set of pins which reflect the number
of stages of auxiliary heat; HP1 for one stage, HP2 for
two stages, and HP3 for three stages of auxiliary heat. If
no auxiliary heat is used with Option 2, place the jumper
on HP1. See figure 14.
For Option 3 with the FM21, DO
NOT place the jumper on any
set of pins. Store the jumper by
placing it on one pin only so that
electrical contact cannot be
made. See figure 9. Figure 14
INDOOR UNIT
HP3
HP2
HP1
G21V or Gas

Page 18
Outdoor Unit Jumper
Position the outdoor unit jumper
according to the speed of the out-
door unit. For single−speed units,
place jumper on 1 SPD; for two−
speed units, place jumper on 2
SPD. See figure 15.
Discharge Air Temperature Jumper
The discharge air temperature jumper enables the dis-
charge air setpoints to be adjusted. The discharge ther-
mostat probe in the supply plenum sends a signal with
temperature information to the Harmony®II control
board. These jumper settings are only activated in ap-
plications that use either a two−speed condensing unit
or a two−speed heat pump. The H+ or H− setting will ad-
just the discharge temperature setpoint in applications
with two−speed heat pump or with single−speed heat
pumps with staged auxiliary heat. Therefore, the heat-
ing discharge temperature setpoint cannot be adjusted
for Option 1. The C+ or C− selection adjusts the cooling
setpoint in applications with a two−speed outdoor unit
only.
One heating and one cooling
adjustment may be made. This
jumper allows adjustment (by
5F) to the specific temperature
setpoints (see figure 16).
Jumpers may be set as follows:
H+ Raises heating temperature setpoint by 5F
H− Lowers heating temperature setpoint by 5F
C+ Raises cooling temperature setpoint by 5F
C− Lowers cooling temperature setpoint by 5F
Common System Component Wiring
The following section shows the wiring for components
used with the zone control system and any of the three
heating and cooling equipment options. This manual cov-
ers wiring for option specific components in their respec-
tive sections.
IMPORTANT
Avoid running any control wiring close to AC house
wiring. If this cannot be avoided, limit close parallel
of power and control wiring to a few feet.
Control Panel Wiring
Connect the marked wires from the control panel to the
control center as shown in figure 17 (refer also to table 1).
Figure 17
Control
Center
Table 1
Control Panel Inputs to Control Center
Pin Description
1Data pertaining to Central, Zone or Off mode
2Data pertaining to Auto, Cool or Heat mode
3Output signal to turn red service led on control panel on
4 Common
5 24VAC
6Data pertaining to fan in Auto or On mode
Dampers & Damper Transformer Wiring
The number of dampers used will depend on the duct sys-
tem design. Use thermostat wire to connect dampers to the
control center. Connect wires as shown in figure 18.
DAMPERS
FROM EACH ZONE
(Four zone application shown)
ZONE 1
ZONE 2
ZONE 3
ZONE 4
DAMPERS
1DZ
2DZ
3DZ
4DZ
ZONE 1ZONE 2ZONE 3ZONE 4
DAMPER DAMPER DAMPER DAMPER
Figure 18
24 VAC
IN
120 VAC
DAMPER TRANSFORMER
A total of five dampers may be connected at the damper out-
put terminals on the control center. If additional dampers are
used, additional transformers and relays will be needed.
Fuse F2 will protect the damper outputs from a short circuit or
overload in the damper wiring.
If dampers are applied to the return duct system, the damp-
ers for each zone must be wired in parallel.
Use thermostat wire to connect the damper transformer to
control center terminal block as shown in figure 18. Refer to
the wiring diagram for wiring connections (figure 19).
Figure 15
1 SPD
2 SPD
OUTDOOR
UNIT
FIGURE 16
C-
DISCH
C+
H-
H+
AIR TEMP

Page 19
Figure 19
TRANSFORMER RATING SHOULD BE SIZED TO ADE-
QUATELY HANDLE ZONE DAMPERS (1−4) PLUS RELAYS
(K1−K4) NOT TO EXCEED CLASS II WIRING LIMIT OF 70
VA.
COMBINED LOAD OF ZONE DAMERS AND ZONE RE-
LAYS NOT TO EXCEED 2 AMPS.
Discharge Air Temperature Probe Wiring
Wire discharge air temperature probe to control center us-
ing thermostat wire. Red wire is connected to the positive
(+) terminal and black wire is connected to the negative (−)
terminal. See figure 20.
Figure 20
DISCHARGE
TEMPERATURE
PROBE
CONTROL
CENTER
DISCHARGE
PROBE
Component Specific Wiring
THERMOSTAT WIRING
Option 1 − G32V/G21V/GSR21V Series Gas Furnace
& Condensing Unit
1. Wire each thermostat with four−wire thermostat cable
to terminals Y, W, R, and C.
2. Run thermostat cable from each of the thermostats to
the control center. Mark each cable according to the
zone thermostat that it is from.
3. Strip the cables and attach each of the three wires to
the control center as shown in figure 23.
4. Set heat anticipator of each thermostat to 0.10 .

Page 20
Option 2 − CB31MV Series Blower Coil Unit & Lennox
Heat Pump &
Option 3 − G32V/G21V/ GSR21V Series Gas Furnace,
Lennox Heat Pump & FM21
1. Wire each thermostat with five−wire thermostat cable
to terminals R, Y, O, W, and C.
2. Run thermostat cable from each of the thermostats to
the control center. Mark each cable according to the
zone thermostat that it is from.
3. Strip the cables and attach each of the five wires to the
control center as shown in figures 24 and 25.
4. Heat pump thermostats are equipped with an E, an A,
and an L terminal. For Option 2, wire from the L termi-
nal to the L terminal/wire at the outdoor unit. DO NOT
wire the E or A terminals. Set heat anticipator of each
thermostat to 0.10. An outdoor thermostat is not need-
ed due to the discharge air temperature probe feature.
For Option 3, wire as shown in figure 25. DO NOT use
A terminal on thermostat. Set heat anticipator of each
thermostat to 0.10.
Pressure Switch Wiring
Option 2 − CB31MV Series Blower Coil Unit & Lennox
Heat Pump and,
Option 3 − G32V/G21V/ GSR21V Series Gas Furnace,
Lennox Heat Pump & FM21
Pull a two-wire thermostat cable from the field−installed
pressure switch to the control center. Wire the pressure
switch to the control center using thermostat wire as shown
in figure 21.
Figure 21
CONTROL
CENTER
FIELD−INSTALLED
PRESSURE SWITCH PRESSURE
SWITCH
G32V/G21V/GSR21V Series Gas Furnace Wiring
After you have installed the furnace, field wire the unit
as shown in the installation instructions provided with
the furnace.
Option 1 − G32V/G21V/GSR21V Series Gas Furnace
& Condensing Unit
Use thermostat wire to connect the furnace and the control
center. Connections to the control center are marked as IN-
DOOR UNIT. See figure 23.
Option 3 − G32V/G21V/GSR21V Series Gas Furnace,
Lennox Heat Pump & FM21
Use thermostat wire to connect the furnace, the control cen-
ter, and the FM21 control system. Connections to the control
center are marked as INDOOR UNIT. See figure 25.
Temperature Modulation: Switch Installation & Wir-
ing (G32V only)
Install temperature modulation switch in the supply air
plenum so that the probe is in the air stream. The switch
should be located downstream of the evaporator coil and
before the supply plenum divides into ducts. Location
should be convenient for wiring the switch to the furnace
terminal strip.
Connect a field supplied wire from the FAN LINE terminal
on the switch to the W1 terminal on the G32V furnace. Con-
nect a field−supplied wire from the FAN LOW terminal on
the switch to the W2 terminal on the G32V furnace. See
system wiring diagrams in figures 23 and 25.
Temperature Modulation: Switch Lever Settings
(G32V only)
Once installed, the temperature modulation switch must
be set to the desired supply air temperatures. Pushing the
two levers as close as possible will result in the minimum
differential. Spreading the two levers apart will result in a
higher differential. See figure 22.
50 250
100
150
200
FIRST LEVER
SET AT 100F
(Switch Closes) SECOND LEVER
SET AT 130F
(Switch Opens)
TEMPERATURE MODULATION SWITCH
LEVER SETTINGS
Figure 22
Note− Align the highest point on the lever to the corresponding desired tem-
perature setting.
Set the first two levers on the desired high fire (switch
opens) and low fire (switch closes) temperatures. When
supply air temperature reaches the second lever setting,
the temperature modulation switch will open to allow the
gas valve to change to low fire operation. When the supply
air temperature lowers to the first lever setting, the switch
will close to allow the gas valve to change to high fire op-
eration.