Lennox T7300 Installation Instructions Manual

Dallas, Texas, USA 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 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 (selectable) System Settings 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. 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. 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). YES NO NO NO 5 FEET (1.5 METERS) 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.

1− Separate the wallplate from the thermostat (see figure 2). THERMOSTAT WIRE HOLE M22267 WALLPLATE Figure 2 − Separate Wallplate from Thermostat Install Wallplate (See Figure 3) Mount the thermostat horizontally on the wall: 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. WALL 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 anchors (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 anchors and tighten. WIRING IMPORTANT − All wiring must agree with applicable codes, ordinances 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 descriptions. − See figure 7 through 10 for wiring diagrams from specific equipment applications. 1. Select conventional set of terminal identifications 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 application. 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 figure 6). 5. Plug the wall opening with non−flammable insulation to prevent drafts from affecting the thermostat.

Hole Table 2 − Terminal Designation Descriptions Terminal Designation Description Rc (see note 1) Power for cooling−connect to secondary side of cooling system transformer. R (see note 1) Power for heating−connect to secondary side of heating system transformer. 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 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. 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 occupied.) 5. Sensor wires must have a cable separate from the thermostat control cable. Terminal A Wiring Details for Economizers − Wire the �A" terminal as shown in diagrams in figures 7, 8, 9 and 10. − The �A" signal is powered from the �R" terminal and energizes the economizer to signal occupied status and drive the damper to the set minimum position.

UNIT TB1 RT2 A2 THERMO- STAT Figure 8 − Wire TG/TC/TH 090−300S Units UNIT TB1 RT2 A2 THERMO- STAT Figure 9 − Wire TG/TC/TH 036−060 Units 1 2 3 4 5 6 7 8 9 10 12 11 13 UNIT TB1 A2 THERMO- STAT RT2 Figure 10 − Wire CB/CBH17 Used with HS29 and HP29 Units

SUBBASE 20K Ohm 20K Ohm 20K Ohm 20K Ohm S1 S2 SUBBASE 10K Ohm 10K Ohm S1 S2 SUBBASE 20K Ohm 20K Ohm 10K Ohm S1 S2 SUBBASE 20K Ohm 10K Ohm 20K Ohm 20K Ohm S1 S2 10K Ohm All combinations of sensors shown here have an equivalent resistance of 20K ohms. Select option 4 on installer setup number 0340.

You can choose from three methods to power the thermostat: − Batteries only (AAA alkaline). − 24 Vac direct connection only. − 24 Vac direct connection with battery backup (AAA alkaline). Wiring 24 Vac Common − Single−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. − Two−Transformer System−Connect the common 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 11). BATTERIES (3) Figure 11 − Installing Batteries 2. Locate and remove the tab labeled Remove (see figure 12). IMPORTANT This tab must be removed in order to set the real−time clock. REMOVE DURING INSTALLATION REMOVE TAB REMOVE DURING INSTALLATION Figure 12 − Remove tab labeled REMOVE from thermostat back. 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 13). SETTING CALENDAR AFTER THERMOSTAT IS ALREADY FUNCTIONING See steps 1 through 4, in the Advanced Settings section to set year, month and day. DONE MON MON TUE WED WED THU THU FRI FRI SA SA SUN CHANGE FILTER UV LAMP HUMIDIFIER PAD OK TO PICK MUL TIPLE DAYS SCREEN LOCKED DONE MON MON WED WED THU THU FRI FRI SA SA SUN PM CHANGE FILTER UV LAMP HUMIDIFIER PAD OK TO PICK MUL TIPLE DAYS SCREEN LOCKED SET CURRENT DAY SET MONTH USE ARROWS TO SET YEAR AND TIME Figure 13 − Setting Date and Time after Initial Powerup

1. Align the terminal screw blocks with the pins on the back of the thermostat. 2 Push the thermostat straight onto the wallplate until it snaps into place (see figure 14). WA L L REMOVE DURING INSTALLATION Figure 14 − Mount Thermostat to Wallplate. 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 15). 3. The Setup Number displays to the lower−left area of the screen. It is a four−digit code beginning with zero. The current setting is displayed to the right. NOTE: To cycle through the Setup Numbers, press the up or down arrow.

O E D N MO CANC SA SU S S E M EM HEAT O Y T F F g Sc Followin hedu el s de Se In i o t T M19923 Figure 15. Entering Installer Setup. Installer System Tests Use the Installer System Test to test the heating, cooling and fan. Refer to the latter portion of Table 3. CAUTION Equipment Damage hazard. Minimum compressor off time is by- passed 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 Number 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−occupancy Purge Duration 0 0−No duration 1−One hour 2−Two hours 3−Three hours Shown only if system has fan and schedule pro- grammable. 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 commercial equipment. 0220 Cycles Per Hour (CPH) for first stage com- pressor 3 1−6 Only shown for system with cool stages. Selec- tion in this stage changes default CPH of sec- ond stage cool.

Installer Setup Number Installer Setup Name Default Setting All Settings Notes 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 convention- al 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 selected (heat pump with more heat than cool stages). 0280 Continuous Backlight 0 0−No 1−Yes Always shown. If AC power not present the op- tion is overridden and normal backlight opera- tion 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 combinations. 2 applies only to Heat Pump applications (allow- ing compressor lockout while displaying temper- ature). Set for total equal resistance for com- bination 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 se- lected and remote sensor selection is outdoor for control. Must enforce a dead band be- tween this and Auxiliary Lockout

Installer Setup Number Installer Setup Name Default Setting All Settings Notes 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 Oc- cupied 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 se- lected the �Cancel Period� option does not ap- pear on the display. 0580 Minimum Com- pressor 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 op- eration in all control regimes (not just recovery or setpoint change). More Aggressive stops signal prior to reaching the setpoint. (For use with oversized equip- ment.)

Installer Setup Number Installer Setup Name Default Setting All Settings Notes 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 op- eration in all control regimes (not just recovery 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 Facto- ry Defaults 0 0 −No 1−Yes Resets all ISU parameters to default values and resets the schedule to default Energy Star. Re- tains only calendar settings and time. INSTALLER TESTS Test 1 Installer Test Cool 0 0−Off 1−Cool Stage 1 2−Cool Stage 2 Test 2 Installer Test Fan 0 0−Off 1−Fan On Test 3 Installer Test Heat 0 0−Off 1−Heat Stage 1 2−Heat Stage 1 and 2 3− Heat Stage 1, 2 and 3 Test 4 Installer Test Auxil- iary Heat 0 0−Auxiliary Heat Off 1−Auxiliary Heat On Test 8 Installer Test TOD/ Economizer 0 0−TOD/Economizer Off 1−TOD/Economizer On NOTE: Press the Done button to exit the Installer System Test.

Off−both heating and cooling systems are off. Cool−Thermostat controls the cooling system. Auto−Thermostat automatically changes between heat and cool operation, depending on indoor temperature. Fan Settings Auto−Fan runs only when heating/cooling system is on. On−Fan runs continuously. Table 4 shows default program settings. See Owner’s Guide for complete instructions to change the program. Table 4 − 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 −−−− a The thermostat default setting is two period only. To use four periods, change the appropriate setup parameter. Outdoor or Indoor Temperature Sensor Allow outdoor or indoor temperature sensor to absorb the air for a minimum of five minutes before taking a reading. See the Sensor instructions for more information. Economizer/TOD Logic (Table 5) Table 5 − Terminal A Operation Effective Call for Terminal A Effective Occupancy Call for Cool TOD Occupied − Energized Unoccupied Yes De−energized Unoccupied No De−energized Override − Energized

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 tti d t h The upper or lower tempera- ture limits were reached. Check temperature setpoints. Check Installer Setup Numbers 0600 and 0610; modify as needed. settings do not change. The keypad is fully locked. Check Installer Setup Number 0670 to change keypad locked options. Thermostat minimum off− time is activated. Wait up to five minutes for the system to respond. Heating or cooling does not come on. System selection not set to Heat or Cool. Set system Selection to correct position. not come on. System type Selection is in- correct. Check Installer Setup Number 0170 and make sure cor- rect 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 cor- rect 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 equipment failure. Check for 24Vac at the equipment on the secondary side of the transformer between power and common. If volt- age 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 thermostat 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 thermostat 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 Set- up Number 0170) is set to Heat Pump. Set System Type (Installer Setup Number 0170) to match the installed heating and/or cooling equipment ning at the same time. 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 dis- play). Cooling equipment failure. Check for 24 Vac at the equipment on the secondary side of the transformer between power and common. If volt- age is not present, check the cooling equipment to find the cause of the problem. Check for 24 Vac between the cool terminal (Y) and trans- former common. If 24 Vac is present, the thermostat is functional. Check the cooling equipment to find the cause of the problem. Loose or broken wire con- nection between thermostat and cooling equipment. 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.

call for heat (electric fur- nace). Fan Control in Heating is set to Gas or Oil Furnace (Set- ting 0180). Set Fan Control in Heating to Electric Furnace (Setting 0180). Heating equipment is running 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 Set- up 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 Set- up 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 temperature 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 tempera- ture setting is not set below 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 partial- ly locked. Check ISU 0670 to change keypad locked options.

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 Temperature Setting Range: Heating: 40°F to 90°F (4.5°C to 32°C). Cooling: 50°F to 99°F (10°C to 37°C). Operating Ambient Temperature: 0°F to 120°F (−18°C to 49°C). Shipping Temperature: −30°F to 150°F (−34.4°C to 65.6°C). Operating Relative Humidity (Non−condensing): 5% to 90%. Thermostat Dimensions: 3−3/4 in. (95mm) high x 6 in. (152mm) wide x 1−3/8 in. (35mm) deep. Accessories: X4148 Outdoor Sensor: 10K ohm NTC. 29M55 Wall−Mount Remote Indoor Sensor: