Lennox Commercial Touchscreen Thermostat User manual

11/08 505103M
*2P1108* *P505103M*
COMMERCIAL
CONTROLS
505103M
11/08
Supersedes 01/2007
INSTALLATION
INSTRUCTIONS
Commercial Touch
Screen Thermostat
E2008 Lennox Industries Inc.
Dallas, Texas, USA
Application
The Lennox Commercial Touchscreen Thermo-
stat provides electronic control of 24 Vac heating
and cooling systems. See Table 1 for a descrip-
tion.
Table 1. Thermostat Description
Feature Description
Powering
Methods
SBattery only
SDirection connection to a 24 Vac
transformer only.
SDirect connection to a 24 Vac
transformer with battery backup.
System
Types
SConventional (up to 2 heat, 2 cool
stages)
SHeat Pump (up to 3 heat, 2 cool
stages)
Changeover Manual or automatic changeover (se-
lectable)
System Set-
tings
Heat−Off−Cool−Auto
Fan Settings Auto−on
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old con-
trol in the trash. Dispose of properly.
Contact your local waste management authority for
instructions regarding recycling and the proper dis-
posal of an old control.
Installation
When Installing this Product...
1. Read these instructions carefully. Failure to
follow them could damage the product or
cause a hazardous condition.
2. Check ratings given in instructions and on the
product to ensure the product is suitable for
your application.
3. Installer must be a trained, experienced ser-
vice technician.
4. After installation is complete, check out prod-
uct operation as provided in these instruc-
tions.
CAUTION
Electrical Shock or Equipment Damage haz-
ard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
Select Thermostat Location
Select a location for the thermostat about 5 feet
(1.5m) above the floor in an area with good air cir-
culation at average temperature (see figure 1).
YES
NO
NO
NO
5 FEET
(1.5 METERS)
Figure 1. Select Thermostat Location
Do not install the thermostat where it can be af-
fected by:
DDrafts or dead spots behind doors and in
corners.
DHot or cold air from ducts.
DRadiant heat from sun or appliances.
DConcealed pipes and chimneys.
DUnheated (uncooled) areas such as an
outside wall behind the thermostat.

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505103M 11/08
Separate Wallplate from Thermostat
Separate the wallplate from the thermostat (see fig-
ure 2).
THERMOSTAT
WIRE HOLE
M22267
WALLPLATE
Figure 2. − Separate Wallplate from Thermostat
Install Wallplate
Install the thermostat horizontally on the wall (see
figure 3):
1. Pull the wires through the wire hole on the
wallplate.
2. Position the wallplate on the wall with the arrow
pointing up. Level the wallplate for appearance
only.
3. Use a pencil to mark the mounting holes.
WA L L
MOUNTING
HOLES
M19916
MOUNTING
SCREWS (2)
WALL ANCHORS (2)
WIRES THROUGH WALL
AND WIRE SLOT
Figure 3. Install Wallplate
4. Remove the wallplate from the wall and drill
two 3/16 inch holes in in the wall (if drywall) as
marked. For firmer material such as plaster,
drill two 7/32 inches holes. Tap the wall an-
chors (provided) into the drilled holes until
flush with the wall.
5. Pull the wires through the wire hole on the
wallplate and position the wallplate over the
wall anchors.
6. Insert the mounting screws into the wall an-
chors and tighten.
Wiring
IMPORTANT
− All wiring must agree with applicable codes, ordi-
nances and regulations
− Use 18 gauge thermostat wire. Shielded cable is
not required.
NOTES −
− Sensor wires must have a cable separate from
the thermostat control cable.
− Refer to Table 2 for terminal designation descrip-
tions.
− See figure 7 through 10 for wiring diagrams from
specific equipment applications.
1. Select conventional set of terminal identifica-
tions which correspond to the system type
(conventional or heat pump (see figure 4).
Lennox commercial equipment does not use
the heat pump system terminals.
S1
S2
Y2
W1
RC
C
Y2
L
A
W2
S1
S2
HEAT PUMP
CONVENTIONAL
L
A
RC
R
W
Y
G
C
SCREW
TERMINALS
R
O/B
Y
G
Figure 4. Terminal Identifications for System
Type
2. Loosen screw terminals used for the applica-
tion.
3. Insert the wires into the terminal block and
tighten each screw terminal (see figure 5).
M19917
Figure 5. Insert Wires into Terminal Block
4. Push excess wire back into the wall opening
and restrict wires to the shaded area (see fig-
ure 6).
5. Plug the wall opening with non−flammable in-
sulation to prevent drafts from affecting the
thermostat.

Page 3
Table 2. Terminal Designation Descriptions
Terminal
Designation Description
Rc
(see note 1)
Power for cooling−connect to secon-
dary side of cooling system trans-
former.
R
(see note 1)
Power for heating−connect to secon-
dary side of heating system trans-
former.
YCompressor output.
C
(see note 2)
Command wire from secondary side
of cooling system transformer.
WHeat relay.
GFan relay.
W2 Second stage heat relay.
Y2 Second stage cooling.
O/B
(see note 3)
Changeover valve for heat pumps.
Terminal not used with Lennox com-
mercial equipment.
A
(see note 4)
Economizer/Time−of−Day (TOD) out-
put−powered via R terminal.
S1
(see note 5)
Optional outdoor or indoor remote
sensor.
S2
(see note 5)
Optional outdoor or indoor remote
sensor.
LPowers red LED behind plastic in
upper right corner of the thermostat.
NOTES −
1 When used in a single−transformer system, leave
metal jumper wire in place between Rc and R. If used
on a two−transform system, remove metal jumper
wire between Rc and R.
2 Common wire is optional when thermostat is used
with batteries. When using separate transformer for
heating and cooling, the common must come from
the cooling transformer.
3 Lennox commercial heat pumps do not use this
terminal to energize the reversing valve. Thermostat
will always be conventional type.
4 Reference economizer literature for wiring details.
When set for economizer operation, the A terminal
provides the occupancy signal. (Power indicates oc-
cupied.)
5 Sensor wires must have a cable separate from
the thermostat control cable.
WALLPLATE
WALL OPENING
WIRE
SHADED AREA
Figure 6. Restrict Wires to Shaded Area of Wire
Hole
Terminal A Wiring Details for Economizers
SWire the A" terminal as shown in diagrams in
figures 7, 8, 9 and 10.
SThe A" signal is powered from the R" termi-
nal and energizes the economizer to signal
occupied status and drive the damper to the
set minimum position.
UNIT TB1A2 THERMOSTAT
Figure 7. Wire LG/LC/LH/SG/SC Units.

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505103M 11/08
UNIT TB1
A2
THERMOSTAT
Figure 8. Wire TG/TC/TH 090−300S Units
UNIT TB1A2
THERMOSTAT
Figure 9. Wire TG/TC/TH 036−060 Units
UNIT TB1A2 THERMOSTAT
Figure 10. Wire CB/CBH17 Used with HS29
and HP29 Units
SUBBASE
SUBBASE
SUBBASE
20K Ohm 10K Ohm
SUBBASE
All combinations of sensors shown here have an
equivalent resistance of 20K ohms. Select option 4
on installer setup number 0340.
SUBBASE
20K Ohm
20K Ohm 20K Ohm
20K Ohm 20K Ohm
10K Ohm10K Ohm20K Ohm
20K Ohm
10K Ohm
20K Ohm
20K Ohm 10K Ohm
Figure 11. Sensor Wiring for Temperature Av-
eraging
Power The Thermostat
You can choose from three methods to power the
thermostat:
SBatteries only (AAA alkaline).
S24 Vac direct connection only.
S24 Vac direct connection with battery backup
(AAA alkaline).
Wiring 24 Vac Common
SSingle−Transformer System−Connect the
common side of the transformer to the C
screw terminal of the thermostat wallplate.
Leave the metal jumper wire in place between
Rc and R.
STwo−Transformer System−Connect the com-
mon side of the cooling transformer to the C
screw terminal of the thermostat wallplate.
Remove the metal jumper wire between Rc
and R.
Installing Batteries
1. Install three AAA alkaline batteries on the
back of the thermostat as marked (see figure
12).

Page 5
BATTERIES (3)
Figure 12. Installing Batteries
2. Locate and remove the tab labeled Remove"
(see figure 13).
IMPORTANT − This tab must be removed in order
to set the real−time clock.
REMOVE DURING
INSTALLATION
REMOVE
TAB
REMOVE DURING
INSTALLATION
Figure 13. Removing REMOVE tab
Setting Calendar and Time
Setting calendar
This thermostat is designed to, under normal use,
automatically keep current time and day in
memory for up to ten years once the calendar is
set. There are two ways to set the calendar for this
thermostat:
Setting calendar when thermostat is first
powered
When the thermostat is first powered, the display is
ready to set the calendar and time. The thermostat
proceeds through a sequence of setup screens
(see figure 14).
Setting calendar after thermostat is already
functioning
See steps 1 through 4, in the Advanced Settings
section to set year, month and day.
DONE
MONMON TUE WEDWED THUTHU FRIFRI SASA SUN
CHANGE FIL TER UV LAMP HUMIDIFIER P AD
OK TO PICK MUL TIPLE DAYS SCREEN LOCKED
DONE
MONMON WEDWED THUTHU FRIFRI SASA SUN
PM
CHANGE FIL TER UV LAMP HUMIDIFIER P AD
OK TO PICK MUL TIPLE DAYS SCREEN LOCKED
SET CURRENT DAY
SET MONTH
USE ARROWS TO SET YEAR AND TIME
Figure 14. Setting Date and Time after Initial
Powerup
Mount Thermostat to Wallplate
1. Align the terminal screw blocks with the pins
on the back of the thermostat.
2. Push the thermostat straight onto the wall-
plate until it snaps into place (see figure 15).
WA L L
REMOVE DURING
INSTALLATION
Figure 15. Mount Thermostat to Wallplate.

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505103M 11/08
Advance Settings
The thermostat has advanced settings to match the
HVAC system. These settings can be adjusted to
match specific needs. Access to these settings is
obtained as follows:
1. From the main screen, press SYSTEM. Five
blank touch keys show on the bottom on the
screen between DONE and CANCEL.
2. Press and hold the two blank keys on either
side of the center blank key for approximately
five seconds (see figure 16).
OED N
MO
CANC
SA SU
SSE
M
EM
HEAT
O
Y T
FF
g
Sc
Followin
eduhel
sde Se In i ot T
M19923
Figure 16. Entering Installer Setup.
3. The Setup Number displays to the lower−left
area of the screen. It is a four−digit code begin-
ning with zero. The current setting is dis-
played to the right.
NOTE − To cycle through the Setup Numbers,
press the up or down arrow.
Installer Setup Numbers, Settings
and Tests
Installer System Tests
Use setup numbers in table 3 setting up the thermo-
stat.
Use the Installer system test to test the heating,
cooling and fan (see table 4).
CAUTION
Equipment Damage hazard.
Minimum compressor off time is bypassed
during installer system test.
Avoid cycling compressor quickly.
IMPORTANT − Use Installer System Test to test
heating, cooling and fan. The setting chosen for
System Type (Installer Setup Number 0170) can
prevent some System Test Numbers from appear-
ing.

Page 7
Table 3. Installer Setup Menu
Installer
Setup No.
Installer
Setup Name
Default
Setting All Settings Notes
0120 Date (Year
Upper) 20 20−22xx 21−21xx Available year range:2001−2178
0130 Date (Year
Lower) 04 00−99 Available year range:2001−2178
0140 Date (Month) 6 1−12
0150 Date (Day) 15 1−31 (Month Dependent)
0160 Schedule
Options 40−Non−Programmable 4−Programmable
0170 System
Selection 8
1−1H/1C
2−1H/1C HP*
3−1H w/o fan
4−1H with fan
6−1C
7−2H/1C HP*
8−2H/2C Conv
9−2H/1C Conv
10−1H/2C Conv
11−2H/2C HP*
12−3H/2C HP*
*Setting not used with Lennox commercial
equipment.
0175
TOD/Econo-
mizer output
(terminal A)
0
0−Unused
1−TOD
2−Economizer
Economizer energizes A during a call for cool.
TOD energizes A during Occupied period and
de−energizes A during Unoccupied. Use
1−TOD.
0180 Heat Fan
Operation 00−Fossil 1−Electric
Only shown for conventional system with heat
stages and fan capability selected. If heat pump
is selected, fan defaults to electric.
0185
Pre−occupan-
cy Purge
Duration
0
0−No duration
1−One hour
2−Two hours
3−Three hours
Shown only if system has fan and schedule
programmable. Pre−occupancy purge enabled
by nonzero duration (and sends economizer to
minimum position).
0190 Reversing
Valve O/B 00−O (O/B On Cool) 1−B (O/B On Heat)
O or B setting not used with Lennox commer-
cial equipment.
0220
Cycles Per
Hour (CPH)
for first stage
compressor
3 1−6
Only shown for system with cool stages.
Selection in this stage changes default CPH of
second stage cool.
0230
CPH for
second stage
compressor
3 1−6 Only shown if two stages of cool selected.
0240
CPH for first
stage conven-
tional heat
5 1−12
Only shown if system is conventional with heat
stages.
Selection in this stage changes default CPH of
second stage heat.
0250
CPH for sec-
ond stage con-
ventional heat
5 1−12 Only shown with at least two stages conven-
tional heat or 2H/1C heat pump selected.
0260 CPH for third
Stage Heat 9 1−12 Only shown if 3H/2C heat pump is selected.
0270 CPH for Auxil-
iary Heat 9 1−12
Only shown if multi−stage heat pump is se-
lected
(heat pump with more heat than cool stages).
table continued on next page

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505103M 11/08
Table 3. Installer Setup Menu
Installer
Setup No. NotesAll Settings
Default
Setting
Installer
Setup Name
0280 Continuous
Backlight 00−No
1−Yes
Always shown. If AC power not present the
option is overridden and normal backlight op-
eration occurs.
0300 Changeover 1 0−Manual
1−Auto
Only shown if system has both heat and cool
stages.
0310 Deadband 3°F
(2°C)
2 (1.5)−2°F (1.5°C)
3 (2.0)− 3°F (2.0°C)
4 (2.5)− 4°F (2.5°C)
5 (3.0)− 5°F (3.0°C)
6 (3.5)− 6°F (3.5°C)
7 (4.0)−7°F (4.0°C)
8 (4.5)− 8°F (4.5°C)
9 (5.0)− 9°F (5.0°C)
Only shown if Automatic Changeover Selected
0320
Temperature
Indication
Scale
00−°F
1− °C
0330 Daylight
Saving 2
0−Disabled,
1−Enabled (US, 1987)
2−Enabled (2007),
3−Enabled (Europe)
0340
Remote
Temperature
Sensor
0
0−None
1−Outdoor for Display
2−Outdoor for Control
3−Remote 10K Indoor
4−Remote 20K Indoor
Averaging would not include on− board sensor.
It is accomplished by series/parallel combina-
tions. 2 applies only to Heat Pump applications
(allowing compressor lockout while displaying
temperature). Set for total equal resistance for
combination of sensors.
0350
Heat Pump
Compressor
Lockout
0
0− None
15(−9.5)−15°F(−9.5°C)
20(− 6.5)−20°F(− 6.5°C)
25(− 4.0)−25°F(− 4.0°C)
30(− 1.0)−30°F(− 1.0°C)
35(1.5)−35°F(1.5°C)
40(4.5)−40°F(4.5°C)
45(7.0)−45°F(7.0°C)
Lennox commercial equipment does not use
heat pump mode. Only shown for heat pump
systems with more heat stages than cool
selected and remote sensor selection is out-
door for control. Must enforce a dead band
between this and Auxiliary Lockout
0360
Heat Pump
Auxiliary Lock-
out
0
0− None
40(4.5)−40°F(4.5°C)
45(7.0)−45°F(7.0°C)
50(10.0)−50°F(10.0°C)
55(13.0)−55°F(13.0°C)
60(15.5)−60°F(15.5°C)
Lennox commercial equipment does not use
heat pump mode. Only shown for heat pump
systems with more heat stages than cool se-
lected and remote sensor selection is outdoor
for control. Must enforce a dead band between
this and Heat Pump Compressor Lockout.
0535
Temporary
Occupied
Duration Limit
3
0−None
1−one hour
2−two hours
3−three hours
4− four hours
0 means no limit
0540 Number of Pe-
riods 42− 2 Periods 4− 4 Periods
Does not appear if Non− programmable is cho-
sen. Applies to all days of the week. With 2
selected the Cancel Period option does not
appear on the display.
table continued on next page

Page 9
Table 3. Installer Setup Menu
Installer
Setup No. NotesAll Settings
Default
Setting
Installer
Setup Name
0580
Minimum
Compressor
Off Time
0
0− Off
2− 2 minutes
3− 3 minutes
4− 4 minutes
5− 5 minutes
Only shown if system has cool stages. Set to
0. Not needed for 3 phase systems.
0600
Heat Tempera-
ture Range
Stops
90 40 to 90°F (4 to 32°C) Only shown if system has heat stages.
0610
Cool Tempera-
ture Range
Stops
50 50 to 99°F (10 to 37°C) Only shown if system has cool stages.
0640 Clock Format 12 12−12 Hour 24− 24 Hour
0650 Extended Fan−
on time Heat 00−Off 90− 90 seconds
Not displayed with fan set to fossil or with cool−
only systems.
0660 Extended Fan−
on time Cool 00−Off 40− 40 seconds Only shown if system has cool stages.
0670 Keypad Lock-
out 0
0−Unlocked
1−Partial Lockout 1
2−Partial Lockout 2
3−Fully Locked
Unlocked: All functions accessible.
Partial 1: Locks all but Holiday, Override, and
Up/Down.
Partial 2: Locks all but Holiday and Override.
Full: Entire interface locked/non−functional.
0680 Temperature
Control Heat 2
1−Less Aggressive
2−Standard
3−More Aggressive
Only shown if system has heat stages.
Only integral gains affected. Affects control
operation in all control regimes (not just recov-
ery or setpoint change).
More Aggressive stops signal prior to reaching
the setpoint. (For use with oversized equip-
ment.)
0690 Temperature
Control Cool 2
1−Less Aggressive
2−Standard
3−More Aggressive
Only shown if system has cool stages.
Only integral gains affected. Affects control
operation in all control regimes (not just recov-
ery or setpoint change).
More Aggressive stops signal prior to reaching
the setpoint. (For use with oversized equip-
ment.)
0685
Recovery
Heat Ramp
Rate
5 0−20°F/hour
Only shown if system has heat stages.
0 disables ramped recovery (step setpoint
change at period start time).
0695 Recovery Cool
Ramp Rate 3 0−20°F/hour
Only shown if system has cool stages.
0 disables ramped recovery (step setpoint
change at period start time).
0700 Temperature
Display Offset 0
−3 (−1.5) −3°F(−1.5°C)
−2 (−1.0)− −2°F (−
1.0°C)
−1 (−0.5)− −1°F (−0.5°C)
0 (0.0)−0°F (0.0°C)
1 (0.5)−1°F (0.5°C)
2 (1.0)− 2°F (1.0°C)
3 (1.5)−3°F (1.5°C)
This offset applies to both the control tempera-
ture and to the display temperature for indoor
sensor (and remote indoor sensor).
0710 Restore Fac-
tory Defaults 00 −No
1−Yes
Resets all ISU parameters to default values
and resets the schedule to default Energy Star.
Retains only calendar settings and time.

Page 10
505103M 11/08
Table 4. Installer Tests
Test
1Test Cool 0
0−Off
1−Cool Stage 1
2−Cool Stage 2
Test
2Test Fan 00−Off 1−Fan On
Test
3Test Heat 0
0−Off
1−Heat Stage 1
2−Heat Stage 1 and 2
3− Heat Stage 1, 2 and 3
Test
4
Auxiliary
Heat 00−Auxiliary Heat Off 1−Auxiliary Heat On
Test
8
TOD/
Economizer 00−TOD/Economizer Off 1−TOD/Economizer On
NOTE − Press the Done button to exit the Installer
System Test.
Operation
System Settings
Heat Thermostat controls the heating system.
Off Both heating and cooling systems are off.
Cool Thermostat controls the cooling system.
Auto Thermostat automatically changes be-
tween heat and cool operation, depending on in-
door temperature.
Fan Settings
Auto Fan runs only when heating/cooling system
is on. On−Fan runs continuously.
Table 5 shows default program settings. See Own-
er’s Guide for complete instructions to change the
program.
Table 5. Energy Star Default Program Settings
Schedule
Time
Setpoints Fan
Schedule
Period Time Heat Cool
Fan
Setting
Occ1 08:00
am
70oF
(21oC)
75oF
(24oC) Auto
Unocc1 10:00
pm
55oF
(10oC)
85oF
(29.5oC) Auto
Occ2a−−−−
Unocc2a−−−−
aThe thermostat default setting is two period only. To
use four periods, change the appropriate setup pa-
rameter.
Outdoor or indoor temperature
sensor
Allow outdoor or indoor temperature sensor to ab-
sorb the air for a minimum of five minutes before
taking a reading. See the Sensor instructions for
more information.
Economizer/TOD Logic (Table 6)
Table 6. Terminal A Operation
Effective Call for Terminal A
Effective
Occupancy
Call
for
Cool TOD
Occupied − Energized
Unoccupied
Ye s De−energized
Unoccupied No De−energized
Override − Energized
Allow outdoor or indoor temperature sensor to ab-
sorb the air for a minimum of five minutes before
taking a reading. See the Sensor instructions for
more information.
Troubleshooting
Table 7 lists symptoms, causes and actions to take
to remedy problems.