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Lennox T7300 Installation Instructions Manual

Commercial touchscreen thermostat
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505,103M
1/2007
Supersedes 12/2005
Commercial Touchscreen
Thermostat
APPLICATION
The Lennox Commercial Touchscreen Thermostat provides electronic control of 24 Vac heating and cooling
systems. See Table 1 for a description .
Feature
Powering Methods
System Types
Changeover
System Settings
Fan Settings
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.
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 service
technician.
4.
After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Electrical Shock or Equipment Damage
hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
Table 1 − Thermostat Description
Description
S Battery only
S Direction connection to a 24 Vac transformer only.
S Direct connection to a 24 Vac transformer with battery backup.
S Conventional (up to 2 heat, 2 cool stages)
S Heat Pump (up to 3 heat, 2 cool stages)
Manual or automatic changeover (selectable)
Heat−Off−Cool−Auto
Auto−on
Page 1

INSTALLATION INSTRUCTIONS

Select Thermostat Location
Select a location for the thermostat about 5 feet (1.5m)
above the floor in an area with good air circulation at
average temperature (see figure 1).
NO
Figure 1 − Select Thermostat Location
Do not install the thermostat where it can be affected by:
− Drafts or dead spots behind doors and in corners.
− Hot or cold air from ducts.
− Radiant heat from sun or appliances.
− Concealed pipes and chimneys.
− Unheated (uncooled) areas such as an outside
wall behind the thermostat.
©2005 Lennox Industries, Inc.
Dallas, Texas, USA
NO
YES
NO
5 FEET
(1.5 METERS)

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Summary of Contents for Lennox T7300

  • Page 1: Installation Instructions

    Commercial Touchscreen Dallas, Texas, USA Thermostat INSTALLATION INSTRUCTIONS APPLICATION The Lennox Commercial Touchscreen Thermostat provides electronic control of 24 Vac heating and cooling systems. See Table 1 for a description . Table 1 − Thermostat Description Feature Description S Battery only Powering Methods S Direction connection to a 24 Vac transformer only.

  • Page 2: Separate Wallplate From Thermostat

    Select conventional set of terminal identifications which correspond to the system type (conventional THERMOSTAT or heat pump (see figure 4). Lennox commercial M22267 equipment does not use the heat pump system terminals. Figure 2 − Separate Wallplate from Thermostat...
  • Page 3 Fan relay. Second stage heat relay. Second stage cooling. O/B (see note 3) Changeover valve for heat pumps. Terminal not used with Lennox commercial equipment. A (see note 4) Economizer/Time−of−Day (TOD) output−powered via R terminal. S1 (see note 5) Optional outdoor or indoor remote sensor.
  • Page 4 UNIT THERMO- THERMO- UNIT STAT STAT Figure 7 − Wire LG/LC/LH/SG/SC Units. Figure 9 − Wire TG/TC/TH 036−060 Units UNIT THERMO- STAT THERMO- UNIT STAT Figure 10 − Wire CB/CBH17 Used with HS29 and Figure 8 − Wire TG/TC/TH 090−300S Units HP29 Units Page 4...

  • Page 5: Sensor Wiring For Temperature Averaging

    Sensor Wiring for Temperature Averaging SUBBASE 20K Ohm 20K Ohm 20K Ohm 20K Ohm SUBBASE 10K Ohm 10K Ohm SUBBASE 10K Ohm 20K Ohm 20K Ohm SUBBASE 20K Ohm 20K Ohm 20K Ohm 10K Ohm 10K Ohm All combinations of sensors shown here have an equivalent resistance of 20K ohms.

  • Page 6: Power The Thermostat

    POWER THE THERMOSTAT IMPORTANT This tab must be removed in order to set You can choose from three methods to power the the real−time clock. thermostat: − Batteries only (AAA alkaline). REMOVE − 24 Vac direct connection only. − 24 Vac direct connection with battery backup (AAA alkaline).

  • Page 7: Mount Thermostat To Wallplate

    Mount Thermostat to Wallplate Advance Settings Align the terminal screw blocks with the pins on the The thermostat has advanced settings to match the back of the thermostat. HVAC system. These settings can be adjusted to match Push the thermostat straight onto the wallplate until specific needs.

  • Page 8: Installer System Tests

    2−Two hours nonzero duration (and sends economizer to 3−Three hours minimum position). Reversing 0−O (O/B On Cool) O or B setting not used with Lennox commercial 0190 Valve O/B 1−B (O/B On Heat) equipment. Cycles Per Only shown for system with cool stages. Selec-...
  • Page 9 Set for total equal resistance for com- 4−Remote 20K Indoor bination of sensors. 0− None 15(−9.5)−15°F(−9.5°C) Lennox commercial equipment does not use 20(− 6.5)−20°F(− 6.5°C) heat pump mode. Only shown for heat pump Heat Pump 25(− 4.0)−25°F(− 4.0°C) systems with more heat stages than cool se-...
  • Page 10 Default Setup All Settings Notes Setup Name Setting Number 0− None Lennox commercial equipment does not use 40(4.5)−40°F(4.5°C) heat pump mode. Only shown for heat pump Heat Pump 45(7.0)−45°F(7.0°C) systems with more heat stages than cool se- 0360 Auxiliary Lock- 50(10.0)−50°F(10.0°C)
  • Page 11 Table 3 − Installer Setup Menu (Continued) Installer Installer Default Setup All Settings Notes Setup Name Setting Number Only shown if system has cool stages. Only integral gains affected. Affects control op- 1−Less Aggressive eration in all control regimes (not just recovery Temperature 2−Standard 0690...

  • Page 12: Operation

    OPERATION Outdoor Indoor Temperature Sensor System Settings Heat−Thermostat controls the heating system. Allow outdoor or indoor temperature sensor to absorb Off−both heating and cooling systems are off. the air for a minimum of five minutes before taking a reading. See the Sensor instructions for more Cool−Thermostat controls cooling...

  • Page 13: Troubleshooting (Table 6)

    TROUBLESHOOTING (TABLE 6) Symptom Possible Cause Action Check for 24 Vac between C and Rc. Display does not come Thermostat is not being Check that AAA batteries are installed correctly and are powered. good. Check temperature setpoints. The upper or lower tempera- Check Installer Setup Numbers 0600 and 0610;...
  • Page 14 Fan does not turn on in a Fan Control in Heating is set Set Fan Control in Heating to Electric Furnace (Setting call for heat (electric fur- to Gas or Oil Furnace (Set- 0180). nace). ting 0180). Heating equipment is not a Heating equipment heat pump but System Type...

  • Page 15: Specifications

    SPECIFICATIONS Operating Ambient Temperature: 0°F to 120°F (−18°C to 49°C). Electrical Ratings: Shipping Temperature: −30°F to 150°F (−34.4°C to 65.6°C). W (Heating) 20 − 30 Vac 0.02 − 1.0A Operating Relative Humidity (Non−condensing): Y (Cooling) 20 − 30 Vac 0.02 − 1.0A 5% to 90%.

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