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Honeywell TB7220U Installation Instructions Manual
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Honeywell TB7220U Installation Instructions Manual

Ultrastat
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See also: Owner's Manual
TB7220U
Ultrastat

Programmable Thermostat

APPLICATION
The TB7220U Programmable Thermostat provides electronic control of 24 Vac heating and cooling systems.
See Table 1 for a description.
Feature
Powering Methods
System Types
Changeover
System Setting
Fan Setting
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. TB7220U Thermostat Description.
• Battery only
• Direct connection to a 24 Vac transformer only
• Direct connection to a 24 Vac transformer with battery backup
• Conventional (up to 2 Heat, 2 Cool stages)
• Heat Pump (up to 3 Heat, 2 Cool stages)
Manual or automatic changeover (selectable)
Heat-Off-Cool-Auto
Auto-On
INSTALLATION INSTRUCTIONS
Description
Select Thermostat Location
Select a location for the thermostat about 5 ft (1.5m)
above the floor in an area with good air circulation at
average temperature. See Fig. 1.
NO
NO
Fig. 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.
NO
YES
5 FEET
[1.5 METERS]
62-0223—1
M22258

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  • Page 1: Programmable Thermostat

    TB7220U Ultrastat Programmable Thermostat INSTALLATION INSTRUCTIONS APPLICATION The TB7220U Programmable Thermostat provides electronic control of 24 Vac heating and cooling systems. See Table 1 for a description. Table 1. TB7220U Thermostat Description. Feature Description Powering Methods • Battery only • Direct connection to a 24 Vac transformer only •...

  • Page 2: Separate Wallplate From Thermostat

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT WIRING Separate Wallplate from Thermostat 1. Separate the wallplate from the thermostat. See Fig. 2. IMPORTANT — All wiring must agree with applicable codes, ordinances and regulations. WALLPLATE — Use 18 gauge thermostat wire. Shielded cable is not required.
  • Page 3 TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT 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.

  • Page 4: Conventional System Wiring

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT Conventional System Wiring (HOT) 24 VAC (HOT) 24 VAC OUTDOOR/INDOOR HEAT RELAY TEMPERATURE HEAT RELAY SENSOR OUTDOOR/INDOOR COMPRESSOR CONTACTOR POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD TEMPERATURE PROTECTION AS REQUIRED. SENSOR FAN RELAY FACTORY INSTALLED JUMPER.
  • Page 5 TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT (HOT) (HOT) 24 VAC 24 VAC COOLING TRANSFORMER FAN RELAY OUTDOOR/INDOOR COOL RELAY 1 COOL RELAY 2 OUTDOOR/INDOOR TEMPERATURE TEMPERATURE SENSOR COOL RELAY 1 COOL RELAY 2 SENSOR FAN RELAY (HOT) HEAT RELAY 2 HEAT RELAY 2...

  • Page 6: Heat Pump System Wiring

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT Heat Pump System Wiring (HOT) 24 VAC (HOT) 24 VAC CHANGEOVER VALVE OUTDOOR/INDOOR TEMPERATURE COMPRESSOR CONTACTOR SENSOR CHANGEOVER VALVE OUTDOOR/INDOOR FAN RELAY TEMPERATURE COMPRESSOR CONTACTOR SENSOR AUXILIARY HEAT RELAY FAN RELAY POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

  • Page 7: Sensor Wiring For Temperature Averaging

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT Sensor Wiring for Temperature Averaging SUBBASE SUBBASE T7770A1006 T7770A T7770A T7770A3002 T7770A1006 T7770A T7770A THE T7770A3002 IS A 10K OHM SENSOR. M22934 M22831 Fig. 19. Wiring two T7770A1006 (20K ohm) Sensors Fig. 17. Wiring four T7770A1006 (20K ohm) Sensors.

  • Page 8: Power The Thermostat

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT POWER THE THERMOSTAT You can choose from three methods to power the thermostat: REMOVE • Batteries only (AA alkaline). • 24 Vac direct connection only. • 24 Vac direct connection with battery backup (AA alkaline). Wiring 24 Vac Common •...

  • Page 9: Setting Calendar And Time

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT SETTING CALENDAR AND TIME 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 and time for this thermostat:...

  • Page 10: Installer Setup Numbers, Settings, And Tests (Table 4)

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT INSTALLER SETUP NUMBERS, SETTINGS, AND TESTS (TABLE 4) Configure Installer Setup Installer System Tests 1. Press and release the System key. Use Installer System Test to test heating, cooling and fan. 2. Press System and Done keys simultaneously.
  • Page 11 TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT Table 4. Installer Setup Menu. (Continued) Installer Setup Installer Setup Default Number Name Setting All Settings Notes 0250 CPH for second 1-12 Only shown for conventional system with at least stage conventional two stages conventional heat or 2H/1C heat pump heat (ISU 0170).
  • Page 12 TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT Table 4. Installer Setup Menu. (Continued) Installer Setup Installer Setup Default Number Name Setting All Settings Notes 0640 Clock Format 12—12 Hour 24—24 Hour 0650 Extended Fan-on 0—Off Not displayed with cool-only systems (ISU 0170 at time Heat 90—90 seconds...

  • Page 13: Operation

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT OPERATION System Settings Outdoor or Indoor Temperature Sensor — Heat: Thermostat controls the heating system. When installing a temperature sensor: — Off: Both heating and cooling systems are off. 1. Allow the sensor to absorb the air for a minimum of —...

  • Page 14: Troubleshooting (Table 6)

    TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT TROUBLESHOOTING (TABLE 6) Table 6. Troubleshooting. Symptom Possible Cause Action Display does not come on. Thermostat is not being powered. Check for 24 Vac between RC and C. Check that AA batteries are installed correctly and are good.
  • Page 15 TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT Table 6. Troubleshooting. (Continued) Symptom Possible Cause Action Fan does not turn on during a System does not control the fan and Set Heat Fan Operation for the thermostat to call for heat. Heat Fan Operation is set for it to do so control the fan (set ISU 0180 to 1).

  • Page 16: Specifications

    TB7220U ULTRASTAT 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.

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