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Document DEVICE REPORTLennox-Commercial-TouchScreen-Thermostat-Installation-Instructions-ManualE2008 Lennox Industries Inc. Dallas, Texas, USA COMMERCIAL CONTROLS 505103M 11/08 Supersedes 01/2007 INSTALLATION INSTRUCTIONS Commercial Touch Screen Thermostat 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 S Battery only S Direction connection to a 24 Vac transformer only. S Direct connection to a 24 Vac transformer with battery backup. System Types S Conventional (up to 2 heat, 2 cool stages) S Heat Pump (up to 3 heat, 2 cool stages) Changeover Manual or automatic changeover (selectable) System Set- Heat-Off-Cool-Auto tings 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: D Drafts or dead spots behind doors and in corners. D Hot or cold air from ducts. D Radiant heat from sun or appliances. D Concealed pipes and chimneys. D Unheated (uncooled) areas such as an outside wall behind the thermostat. 11/08 *2P1108* 505103M *P505103M* Separate Wallplate from Thermostat Separate the wallplate from the thermostat (see figure 2). WALLPLATE WIRE HOLE THERMOSTAT M22267 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 WIRES THROUGH WALL AND WIRE SLOT WALL ANCHORS (2) MOUNTING HOLES 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. HEAT PUMP CONVENTIONAL Y2 Y2 RC RC L L R R A A W O/B W1 W2 Y Y S1 S1 G G S2 S2 C C SCREW TERMINALS 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). MOUNTING SCREWS (2) M19916 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. 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. 505103M 11/08 Page 2 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 Command wire from secondary side (see note 2) 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 Economizer/Time-of-Day (TOD) out- (see note 4) put-powered via R terminal. S1 Optional outdoor or indoor remote (see note 5) sensor. S2 Optional outdoor or indoor remote (see note 5) 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. WIRE WALLPLATE WALL OPENING SHADED AREA Figure 6. Restrict Wires to Shaded Area of Wire Hole Terminal A Wiring Details for Economizers S Wire the A" terminal as shown in diagrams in figures 7, 8, 9 and 10. S The 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. A2 THERMOSTAT UNIT TB1 Figure 7. Wire LG/LC/LH/SG/SC Units. Page 3 A2 THERMOSTAT UNIT TB1 SUBBASE SUBBASE 20K Ohm 10K Ohm SUBBASE 10K Ohm Figure 8. Wire TG/TC/TH 090-300S Units A2 THERMOSTAT UNIT TB1 Figure 9. Wire TG/TC/TH 036-060 Units A2 THERMOSTAT UNIT TB1 Figure 10. Wire CB/CBH17 Used with HS29 and HP29 Units 20K Ohm 20K Ohm 10K Ohm SUBBASE 20K Ohm 20K Ohm SUBBASE 20K Ohm 20K Ohm 20K Ohm 20K Ohm 20K Ohm 10K Ohm 10K Ohm All combinations of sensors shown here have an equivalent resistance of 20K ohms. Select option 4 on installer setup number 0340. Figure 11. Sensor Wiring for Temperature Averaging Power The Thermostat You can choose from three methods to power the thermostat: S Batteries only (AAA alkaline). S 24 Vac direct connection only. S 24 Vac direct connection with battery backup (AAA alkaline). Wiring 24 Vac Common S 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. S Two-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). 505103M 11/08 Page 4 See steps 1 through 4, in the Advanced Settings section to set year, month and day. SET CURRENT DAY SET MONTH MON TUE WED THU FRI SA SUN OK TO PICK MUL TIPLE DAYS SCREEN LOCKED CHANGE FIL TER UV LAMP HUMIDIFIER P AD 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 TAB DONE USE ARROWS TO SET YEAR AND TIME MON WED THU FRI SA SUN OK TO PICK MUL TIPLE DAYS SCREEN LOCKED CHANGE FIL TER UV LAMP HUMIDIFIER P AD PM DONE REMOVE DURING INSTALLATION 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 IRNESMTOAVLELADTUIROINNG 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 wallplate until it snaps into place (see figure 15). WA L L Figure 15. Mount Thermostat to Wallplate. Page 5 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). MO Insi de SYST E M EM HEAT OF F DON E SA SU Se t To Followin g Sch edu l e CANC 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 beginning with zero. The current setting is displayed 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 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. 505103M 11/08 Page 6 Table 3. Installer Setup Menu Installer Installer Default Setup No. Setup Name Setting All Settings Notes 0120 0130 0140 0150 0160 0170 0175 0180 0185 0190 0220 0230 0240 0250 0260 0270 Date (Year Upper) 20 20-22xx 21-21xx Available year range:2001-2178 Date (Year Lower) 04 00-99 Available year range:2001-2178 Date (Month) 6 1-12 Date (Day) 15 1-31 (Month Dependent) Schedule Options 4 0-Non-Programmable 4-Programmable System Selection 1-1H/1C 2-1H/1C HP* 3-1H w/o fan 4-1H with fan 6-1C 8 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. TOD/Economizer output (terminal A) 0-Unused 0 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. 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. Pre-occupancy Purge Duration 0-No duration 0 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). 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. 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. CPH for second stage compressor 3 1-6 Only shown if two stages of cool selected. CPH for first stage conventional heat 5 1-12 Only shown if system is conventional with heat stages. Selection in this stage changes default CPH of second stage heat. CPH for sec- ond stage con- 5 1-12 ventional heat Only shown with at least two stages conventional heat or 2H/1C heat pump selected. CPH for third Stage Heat 9 1-12 Only shown if 3H/2C heat pump is selected. CPH for Auxiliary Heat 9 1-12 Only shown if multi-stage heat pump is selected (heat pump with more heat than cool stages). table continued on next page Page 7 Table 3. Installer Setup Menu Installer Installer Default Setup No. Setup Name Setting All Settings Notes 0280 0300 0310 0320 0330 0340 0350 0360 0535 0540 Continuous Backlight Changeover Deadband Temperature Indication Scale Daylight Saving Remote Temperature Sensor Heat Pump Compressor Lockout Heat Pump Auxiliary Lockout Temporary Occupied Duration Limit Number of Periods 0 1 3°F (2°C) 0 2 0 0 0 3 4 0-No 1-Yes 0-Manual 1-Auto 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) Always shown. If AC power not present the option is overridden and normal backlight operation occurs. Only shown if system has both heat and cool stages. Only shown if Automatic Changeover Selected 0-°F 1- °C 0-Disabled, 1-Enabled (US, 1987) 2-Enabled (2007), 3-Enabled (Europe) 0-None 1-Outdoor for Display 2-Outdoor for Control 3-Remote 10K Indoor 4-Remote 20K Indoor 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) 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) 0-None 1-one hour 2-two hours 3-three hours 4- four hours 2- 2 Periods 4- 4 Periods Averaging would not include on- board sensor. It is accomplished by series/parallel combinations. 2 applies only to Heat Pump applications (allowing compressor lockout while displaying temperature). Set for total equal resistance for combination of sensors. 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 outdoor for control. Must enforce a dead band between this and Auxiliary Lockout 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 outdoor for control. Must enforce a dead band between this and Heat Pump Compressor Lockout. 0 means no limit Does not appear if Non- programmable is chosen. 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 505103M 11/08 Page 8 Table 3. Installer Setup Menu Installer Installer Default Setup No. Setup Name Setting All Settings Notes 0580 0600 0610 0640 0650 0660 0670 0680 0690 0685 0695 0700 0710 Minimum Compressor Off Time 0- Off 2- 2 minutes 0 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. Heat Tempera- ture Range 90 40 to 90° F (4 to 32° C) Only shown if system has heat stages. Stops Cool Tempera- ture Range 50 50 to 99°F (10 to 37°C) Only shown if system has cool stages. Stops Clock Format 12 12-12 Hour 24- 24 Hour Extended Fan- on time Heat 0 0-Off 90- 90 seconds Not displayed with fan set to fossil or with cool- only systems. Extended Fan- on time Cool 0 0-Off 40- 40 seconds Only shown if system has cool stages. Keypad Lockout 0-Unlocked 0 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. Temperature Control Heat 1-Less Aggressive 2 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 recovery or setpoint change). More Aggressive stops signal prior to reaching the setpoint. (For use with oversized equipment.) Temperature Control Cool 1-Less Aggressive 2 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 recovery or setpoint change). More Aggressive stops signal prior to reaching the setpoint. (For use with oversized equipment.) 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). 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). Temperature Display Offset -3 (-1.5) -3°F(-1.5°C) -2 (-1.0)- -2°F (- 1.0°C) 0 -1 (-0.5)- -1°F (-0.5°C) 0 (0.0)-0°F (0.0°C) 1 (0.5)-1°F (0.5°C) This offset applies to both the control temperature and to the display temperature for indoor sensor (and remote indoor sensor). 2 (1.0)- 2°F (1.0°C) 3 (1.5)-3°F (1.5°C) Restore Factory 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. Page 9 Table 4. Installer Tests Test 1 Test Cool 0-Off 0 1-Cool Stage 1 2-Cool Stage 2 Test 2 Test Fan 0 0-Off 1-Fan On Test 3 Test Heat 0-Off 0 1-Heat Stage 1 2-Heat Stage 1 and 2 3- Heat Stage 1, 2 and 3 Test Auxiliary 4 Heat 0 0-Auxiliary Heat Off 1-Auxiliary Heat On Test TOD/ 8 Economizer 0 0-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 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 5 shows default program settings. See Owner's Guide for complete instructions to change the program. Table 5. Energy Star Default Program Settings Schedule Period Time Setpoints 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 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 absorb 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. 505103M 11/08 Page 10 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 temperature 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. 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. System type Selection is incorrect. Set system Selection to correct position. 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 equipment 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 thermostat is functional. Check the heating equipment to find the cause of the problem. Loose or broken wire connection between thermostat and heating equipment. 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 cooling equipment are running 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. Heating and cooling wires are shorted together. Set System Type (Installer Setup Number 0170) to match the installed heating and/or cooling equipment 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 thermostat is functional. Check the cooling equipment to find the cause of the problem. Loose or broken wire connection 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 thermostat and the cooling equipment. Fan does not turn on in a call for heat (electric furnace). Fan Control in Heating is set to Gas or Oil Furnace (Setting 0180). Set Fan Control in Heating to Electric Furnace (Setting 0180). table continued on next page Page 11 Table 7. Troubleshooting Symptom Possible Cause Action 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 temperature setting is set below room temperature (Heat On is not in the display). 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 display. 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 display. System setting is not set to Cool and/or the temperature 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 Wait up to five minutes for the cooling or heating (heat timer is active. 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 partially locked. Check ISU 0670 to change keypad locked options. Specifications Electrical Ratings: W (Heating) Y (Cooling) G (Fan) A (Economizer/TOD) 20 - 30 Vac 0.02 - 1.0A 20 - 30 Vac 0.02 - 1.0A 20 - 30 Vac 0.02 - 0.60A 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 - 47W36 Wall-Mount Remote Indoor Sensor 20K ohm - 47W37 Wall-Mount Remote Indoor Sensor 10K ohm 505103M 11/08 Page 12My Name