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TB8220U
Commercial VisionPRO™
Programmable Thermostat
INSTALLATION INSTRUCTIONS
APPLICATION
The TB8220U Programmable Thermostat provides electronic control of 24 Vac heating and cooling systems.
See Table 1 for a description.
Table 1. TB8220U Thermostat Description.
Feature Description
Powering Methods • Battery only
• Direct 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 P
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT 4. Remove the wallplate from the wall and drill two 3/16 in. holes in the wall (if drywall) as marked. For firmer material such as plaster, drill two 7/32 in. 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 NO YES and position the wallplate over the wall anchors. 6. Insert the mounting screws into the wall anchors NO and tighten. NO 5 FEET
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT 3. Insert the wires into the terminal block and tighten each screw terminal. See Fig. 5. WIRE WALLPLATE M19917 Fig. 5. Insert wires into terminal block. WALL OPENING 4. Push excess wire back into the wall opening and restrict wires to the shaded area. See Fig. 6. SHADED AREA M22266 5. Plug the wall opening with nonflammable insulation to prevent drafts from affecting the thermostat. Fig. 6. Restrict wires to shaded area of wire hole. Table
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Conventional System Wiring Y2 RC 2 1 2 L R L1 (HOT) Y2 RC 1 A W 2 24 VAC L2 L R L1 W2 Y (HOT) A W S1 G 24 VAC W2 Y S2 C L2 S1 G 3 S2 C 3 OUTDOOR/INDOOR HEAT RELAY TEMPERATURE FAN RELAY SENSOR OUTDOOR/INDOOR ECONOMIZER TEMPERATURE COMPRESSOR CONTACTOR SENSOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD HEAT RELAY PROTECTION AS REQUIRED. ECONOMIZER 2 FACTORY INSTALLED JUMPER. 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD 3
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Y2 RC Y2 RC 2 1 2 1 L R L R L1 L1 A W (HOT) A W (HOT) W2 Y 24 VAC W2 Y 24 VAC S1 G L2 S1 G L2 S2 C S2 C 3 3 OUTDOOR/INDOOR OUTDOOR/INDOOR FAN RELAY TEMPERATURE FAN RELAY TEMPERATURE SENSOR SENSOR COOL RELAY 2 COOL RELAY 1 1 HEAT RELAY 2 COOL RELAY 2 COOL RELAY 1 HEAT RELAY 2 L1 (HOT) ECONOMIZER HEAT RELAY 1 ECONOMIZER HEAT RELAY 1 24 VAC L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 POWER SUPPLY. PRO
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Heat Pump System Wiring L1 L1 (HOT) (HOT) Y2 24 VAC 24 VAC 2 RC Y2 RC 2 L L2 L2 R L R 1 1 A O/B 4 A O/B 4 W1 Y W1 Y S1 G S1 G S2 C S2 C 3 3 FAN RELAY FAN RELAY OUTDOOR/INDOOR OUTDOOR/INDOOR TEMPERATURE TEMPERATURE 5 COMPRESSOR CONTACTOR 5 COMPRESSOR CONTACTOR SENSOR SENSOR CHANGEOVER VALVE CHANGEOVER VALVE ECONOMIZER AUXILIARY HEAT RELAY ECONOMIZER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEAN
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Sensor Wiring for Temperature Averaging SUBBASE SUBBASE S1 S2 S1 S2 T7770A T7770A T7770A1006 TT TT TT T4 T3 1 T7770A3002 T7770A T7770A T7770A1006 TT TT TT M22831 1 THE T7770A3002 IS A 10K OHM SENSOR. M22934 Fig. 18. Wiring four T7770A1006 (20K ohm) Sensors. Fig. 20. Wiring two T7770A1006 (20K ohm) Sensors and one T7770A3002 (10K ohm) sensor to provide a SUBBASE temperature averaging network S1 S2 Y2 T4 T3 T4 T3 W2 1 S1 C7189 C7189 S2 1 1 T7
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT POWER THE THERMOSTAT You can choose from three methods to power the IMPORTANT thermostat: This tab must be removed in order to set the • Batteries only (AAA alkaline). real-time clock. • 24 Vac direct connection only. • 24 Vac direct connection with battery backup (AAA alkaline). REMOVE TAB Wiring 24 Vac Common • Single-Transformer System—Connect the common side of the transformer to the C screw terminal of the thermostat wallplate. Lea
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Advanced Settings WALL 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 of 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 Fig. 26.) 3. The
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Table 4. Installer Setup Menu. (Continued) Installer Setup Installer Setup Default Number Name Setting All Settings Notes 0170 System Selection 8 1—1H/1C Conv To use the Emergency Heat button, select setting 2—1H/1C HP #7 or #12. See Fig. 16 or 17 for auxiliary heat 3—1H w/o fan wiring. 4—1H with fan 6—1C 7—2H/1C HP (Aux. Heat) 8—2H/2C Conv 9—2H/1C Conv 10—1H/2C Conv 11—2H/2C HP 12—3H/2C HP (Aux. Heat) 0175 TOD/Economizer 0 0—Unused Econ
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Table 4. Installer Setup Menu. (Continued) Installer Setup Installer Setup Default Number Name Setting All Settings Notes 0340 Remote 0 0—None Averaging would not include on-board sensor. It is Temperature 1—Outdoor for Display accomplished by series/parallel combinations. Sensor 2—Outdoor for Control 2 applies only to Heat Pump applications (allowing 3—Remote 10K Indoor compressor lockout while displaying temperature). 4—Remote 20K Indo
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Table 4. Installer Setup Menu. (Continued) Installer Setup Installer Setup Default Number Name Setting All Settings Notes 0690 Temperature 2 1—Less Aggressive Only shown if system has cool stages. Control Cool 2—Standard Only integral gains affected. Affects control 3—More Aggressive operation in all control regimes (not just recovery or setpoint change). More Aggressive stops signal prior to reaching the setpoint. (For use with oversize
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT — When the Minimum Off Timer expires, “Cool On” or OPERATION IN HEAT MODE BELOW BALANCE POINT “Heat On” (heat pumps only)” appears solidly in the (OUTDOOR TEMPERATURE) display and the compressor and fan turn on. When the outdoor temperature is below the selected Balance Point Temperature (ISU 0350), only the Fossil Fuel (auxiliary heat) operates and the fan (G terminal) Outdoor or Indoor Temperature Sensor does not energize when the therm
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT TROUBLESHOOTING (TABLE 7) 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 The upper or lower temperature limits Check temperature setpoints. change. were reached. Check Installer Setup Numbers 0600 and 0610; modify as needed. The keypad is fully locke
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT Table 7. Troubleshooting. (Continued) Symptom Possible Cause Action Fan does not turn on in a call Fan Control in Heating is set to Gas or Set Fan Control in Heating to Electric for heat (electric furnace). Oil Furnace (Setting 0180). Furnace (Setting 0180). Heating equipment is running Heating equipment is not a heat pump Set System Type (Installer Setup Number in the cool mode. but System Type (Installer Setup 0170) to match the installed
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TB8220U COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT SPECIFICATIONS Electrical Ratings: Thermostat Dimensions: 3-3/4 in. (95 mm) high x 6 in. (152 mm) wide x 1-3/8in. (35 mm) deep. Voltage Running Terminal (50/60 Hz) Current Accessories: W (Heating) 20 - 30 Vac 0.02 - 1.0A C7089U Outdoor Sensor: 10K ohm NTC. C7189U Remote Indoor Sensor: 10K ohm NTC. Y (Cooling) 20 - 30 Vac 0.02 - 1.0A C7772 Flush-Mount Remote Indoor Sensor: G (Fan) 20 - 30 Vac 0.02 - 0.60A 20K ohm NTC. T7770A1006 Wall-Mount
