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 | • Battery only • Direction connection to a 24 Vac transformer only. • Direct connection to a 24 Vac transformer with battery backup. |
System Types | • Conventional (up to 2 heat, 2 cool stages) • Heat 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 control in the trash. Dispose of properly.
Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control.
When Installing this Product…
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).
Do not install the thermostat where it can be affected by:
Separate Wallplate from Thermostat
Separate the wallplate from the thermostat (see Figure 2).
Install the thermostat horizontally on the wall (see figure 3):
IMPORTANT
NOTES
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. |
Y | Compressor output. |
C (see note 2) | Command wire from secondary side of cooling system transformer. |
W | Heat relay. |
G | Fan 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. |
L | Powers 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. |
Terminal A Wiring Details for Economizers
You can choose from three methods to power the thermostat:
Wiring 24 Vac Common
Installing Batteries
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.
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:
Installer System Tests
Use setup numbers in table 3 setting up the thermostat.
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 appearing.
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 | 4 | 0−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 | 0 | 0−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 | 0 | 0−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 a multi−stage heat pump is se- lected (heat pump with more heat than cool stages). |
Table 3. Installer Setup Menu | ||||
Installer Setup No. | Installer Setup Name | Default Setting | All Settings | Notes |
0280 | Continuous Backlight | 0 | 0−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 | 0 | 0−°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 | 4 | 2− 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 3. Installer Setup Menu | ||||
Installer Setup No. | Installer Setup Name | Default Setting | All Settings | Notes |
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 | 0 | 0−Off 90− 90 seconds | Not displayed with fan set to fossil or with cool− only systems. |
0660 | Extended Fan− on time Cool | 0 | 0−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 | 0 | 0 −No 1−Yes | Resets all ISU parameters to default values and resets the schedule to default Energy Star. Retains only calendar settings and time. |
Table 4. Installer Tests
Test 1 | Test Cool | 0 | 0−Off 1−Cool Stage 1 2−Cool Stage 2 |
Test 2 | Test Fan | 0 | 0−Off 1−Fan On |
Test 3 | Test 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 | 0 | 0−Auxiliary Heat Off 1−Auxiliary Heat On |
Test 8 | TOD/ Economizer | 0 | 0−TOD/Economizer Off 1−TOD/Economizer On |
NOTE − Press the Done button to exit the Installer System Test. |
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 Period | Time | Setpoints | Fan Setting | |
Heat | Cool | |||
Occ1 | 08:00 am | 70oF (21oC) | 75oF (24oC) | Auto |
Unocc1 | 10:00 pm | 55oF (10oC) | 85oF (29.5oC) | Auto |
Occ2a | −−−− | |||
Unocc2a | −−−− | |||
a The thermostat default setting is two period only. To use four periods, change the appropriate setup pa- parameter. |
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 Occupancy | Call for Cool | Terminal A |
TOD | ||
Occupied | − | Energized |
Unoccupied | Yes | De−energized |
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.
Table 7 lists symptoms, causes and actions to take to remedy problems.
Table 7. Troubleshooting | ||
Symptom | Possible Cause | Action |
Display does not come on. | Thermostat is not being powered. | Check for 24 Vac between C and Rc. Check that AAA batteries are installed correctly and are good. |
Temperature settings do not change. | The upper or lower tem- perature limits were reached. | Check temperature setpoints. Check Installer Setup Numbers 0600 and 0610; modify as needed. |
The keypad is fully locked. | Check Installer Setup Number 0670 to change keypad locked options. | |
Heating or cooling does not come on. | Thermostat minimum off− time is activated. | Wait up to five minutes for the system to respond. |
System selection not set to Heat or Cool. | Set system Selection to correct position. | |
System type Selection is incorrect. | Check Installer Setup Number 0170 and make sure correct System type is chosen. | |
Thermostat is calling for Heat (Heat on) or Cool (Cool on) but no heating or cooling is running. | Heating or cooling equip- ment is not operating. | Check wiring. Check Installer Setup Number 0170 and make sure correct system type is chosen. Verify operation of equipment in System Test mode. |
Heat does not turn on (Heat On is solid in the display). |
Heating equipmentfailure. | Check for 24Vac at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the heating equipment to find the cause of the problem. Check for 24 Vac between the heat terminal (W) and transformer common. If 24 Vac is present, the thermo- stat is functional. Check the heating equipment to find the cause of the problem. |
Loose or broken wire con- nection between thermo- stat and heating equip- ment. | Check for 24 Vac between the heat terminal (W) and transformer common. If voltage is not present, check wire connection (loose or broken) between the thermo- stat and the heating equipment. | |
Both the heating and cool- ing equipment are run- ning at the same time. | The heating equipment is not a heat pump but the System Type (Installer Setup Number 0170) is set to Heat Pump. | Set System Type (Installer Setup Number 0170) to match the installed heating and/or cooling equipment |
Heating and cooling wires are shorted together. | Separate the shorted heating and cooling wires. | |
Cooling does not turn on (Cool On is solid in the display). |
Cooling equipment failure. | Check for 24 Vac at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the cooling equipment to find the cause of the problem. Check for 24 Vac between the cool terminal (Y) and transformer common. If 24 Vac is present, the thermo- stat is functional. Check the cooling equipment to find the cause of the problem. |
Loose or broken wire con- nection between thermo- stat and cooling equip- ment. | Check for 24 Vac between the cool terminal (Y) and transformer common. If voltage is not present, check the wire connection (loose or broken) between the ther- mostat and the cooling equipment. | |
Fan does not turn on in a call for heat (electric fur- nace). | Fan Control in Heating is set to Gas or Oil Furnace (Setting 0180). | Set Fan Control in Heating to Electric Furnace (Setting 0180). |
Table 7. Troubleshooting | ||
Symptom | Possible Cause | Action |
Heating equipment is run- ning in the cool mode. | Heating equipment is not a heat pump but System Type (Installer Setup Number 0170) is set to Heat Pump. | Set System Type (Installer Setup Number 0170) to match the installed heating and/or cooling equipment. |
Heating equipment does not turn off and heat tem- perature setting is set be- low room temperature (Heat On is not in the dis- play). | Heating equipment is not a heat pump but System Type (Installer Setup Number 0170) is set to Heat Pump. |
Set System Type (Installer Setup Number 0170) to match the installed heating and/or cooling equipment. |
Cannot set the system setting to Heat. | System Type (Installer Setup Number 0170) is set to Cool Only. | Set System Type (Installer Setup Number 0170) to match the installed heating and/or cooling equipment. |
Cannot set the system setting to Cool. | System Type (Installer Setup Number 0170) is set to Heat Only or Heat Only with Fan. | Set System Type (Installer Setup Number 0170) to match the installed heating and/or cooling equipment. |
Heat On is not in the dis- play. | System setting is not set to Heat and/or tempera- ture setting is not set above room temperature. | Set the system setting to Heat and set the temperature setting above the room temperature. |
Cool On is not in the dis- play. | System setting is not set to Cool and/or the temper- ature setting is not set be- low room temperature. | Set the system setting to Cool and set the temperature setting below the room temperature. |
Wait is in the display. | Compressor minimum off timer is active. | Wait up to five minutes for the cooling or heating (heat pump) equipment to turn on. |
Screen Locked” appears on the screen and all or some of the keys do not respond. | The keypad is fully or par- tially locked. | Check ISU 0670 to change keypad locked options. |
Electrical Ratings:
W (Heating) | 20 − 30 Vac | 0.02 − 1.0A |
Y (Cooling) | 20 − 30 Vac | 0.02 − 1.0A |
G (Fan) | 20 − 30 Vac | 0.02 − 0.60A |
A (Economizer/TOD) | 20 − 30 Vac | 0.02 − 1.0A |
Download manual:
Lennox Commercial Touch Screen Thermostat Installation Guide
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