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APPLICATION
The TB7220 Ultrastat Programmable Thermostat is an effortless, seven-day programmable thermostat that provides universal system compatibility, precise comfort control, and is easy to program. The TB7220 provides temperature control for gas, oil, electric, and heat pumps for up to 2 heat, and 2 cool systems.
Thermostat Description: See Table 1.
Electrical Ratings: See Table 2.
Humidity Ratings (RH, non-condensing)
Table 1. Thermostat Description
Feature | Description |
Powering methods | • Battery only • 24 Vac only • 24 Vac with battery backup |
System types (up to 2 heat/2 cool) | • Gas or electric heat with air conditioning • Warm air, hot water, high-efficiency furnaces, and heat pumps • Heat only • Heat only with fan • Cool only |
Changeover | Manual or Auto changeover selectable |
System setting | Heat-Off-Cool-Auto |
Fan setting | Auto-On |
Table 2. Electrical Ratings
Terminal | Voltage (50/60 Hz) | Running Current |
W (Heating) | 20 – 30 Vac | 0.02 – 1.0A |
Y (Cooling) | 20 – 30 Vac | 0.02 – 1.0A |
G (Fan) | 20 – 30 Vac | 0.02 – 0.60A |
Table 3. Energy-saving Default Program Settings
Schedule Period | Time | Setpoints | |
Heat | Cool | ||
Occ1 | 8:00am | 70°F (21°C) | 75°F (24°C) |
Unocc1 | 10:00pm | 55°F (10°C) | 85°F (29.5°C) |
Occ2 | — | — | — |
Unocc2 | — | — | — |
Cycle Rates (at 50% Load)
Heating: Selectable 1 – 12 cycles per hour.
Cooling: Selectable 1 – 6 cycles per hour.
Interstage Differential
Droopless control. Once the first stage is running at 90% load, the thermostat energizes the second stage.
Cool Indication: Displays “Cool On” when Cool is activated.
Heat Indication: Displays “Heat On” when Heat is activated.
Auxiliary Heat Indication: Displays “Aux. Heat On” when Auxiliary Heat is activated.
Clock Accuracy: ±1 minute per month.
Finish: TB7000: Premier White® color.
C7189U Wall Mount Remote Indoor Sensor: Premier White® color.
T7770A Wall Mount Remote Indoor Sensor: Premier White® color.
Batteries: Two replaceable AA alkaline batteries: Power thermostat when 24 Vac common is not used.
Non-replaceable lithium battery with ten-year life: Under normal conditions holds calendar and time settings.
NOTE: Alkaline batteries keep a calendar and time if the lithium battery is no longer functional
Resistance Characteristics of Remote Sensors
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering numbers. If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
Calibration (TB7220, C7089U, C7189U, T7770A)
No field calibration is required.
Mounting Means
TB7220: Direct wall mount using mounting screws and anchors provided. Fits standard vertical or horizontal 2 in. x 4 in. junction box.
C7089U: Mounts outside of living space with mounting clip and screws provided.
C7189U, T7770A: Mounts directly on the wall using mounting screws and anchors provided. Fits a vertical 2 x 4 in. junction box.
Cover Plate: 32003796-001 Cover Plate is used to cover marks left on the wall by the old thermostat.
Dimensions: TB7220 Thermostat: See Fig. 1.
C7089U Outdoor Sensor Mounting Clip: See Fig. 3.
C7189U Remote Indoor Sensor: see Fig. 5.
T7770A: See Fig. 4.
32003796-001 Cover Plate: See Fig. 2.
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 it properly. Contact your local waste management authority
for instructions regarding recycling and the proper disposal of an old control.
When Installing this Product…
CAUTION
Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect the power supply before installation.
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 an average temperature. See Fig. 6.
Do not install the thermostat where it can be affected by:
Install Wallplate (See Fig. 8)
Mount the thermostat horizontally on the wall:
WIRING
CAUTION
Electrical Shock Hazard. Can cause electrical shock or equipment damage. Disconnect the power supply before connecting the wiring.
IMPORTANT
NOTES
Table 4. Wiring Diagrams
System Type | Wallplate Terminal Identifications | Wiring Diagram Figure |
Standard Heat/Cool | Conventional | 12, 13 |
Heat Only | Conventional | 14 |
Cool only | Conventional | 15 |
Standard Multistage up to 2 Heat/2 Cool | Conventional | 16, 17 |
Heat Pump (No Auxiliary Heat) | Heat Pump | 18, 19 |
Heat Pump (with Auxiliary Heat) | Heat Pump | 20, 21 |
Multiple T7770A Sensors | — | 26, 27, 28 |
Multiple C7189U Sensors | — | 29 |
Table 5. 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) | Common 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. |
S1 (See Note 5) | Optional outdoor or indoor remote sensor. |
S2 (See Note 5) | Optional outdoor or indoor remote sensor. |
NOTES:
Conventional System Wiring
Fig. 12. Typical wiring of single transformer 1H/1C system
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
FACTORY-INSTALLED JUMPER.
WHEN USING BATTERIES, THE 24V COMMON CONNECTION IS OPTIONAL
You can choose from three methods to power the thermostat:
Wiring 24 Vac Common
Installing Batteries
Mount the sensor where (see Fig. 24)
Do not mount the sensor
Use the following steps to mount the sensor
CAUTION
Electrical Interference (Noise) Hazard. Can cause erratic system operation. Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts, and
large power distribution panels. Use the shielded cable to reduce interference when rerouting is not possible.
Locate and Mount T7770A or C7189U Remote
Indoor Temperature Sensor (Optional)
Locate and mount the sensor in the same fashion as the Thermostat. See the Select Thermostat Location section. Consider the following as well:
Wire Indoor Sensor
CAUTION
Electrical Interference (Noise) Hazard. Can cause erratic system operation. Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts and
large power distribution panels.
Fig. 27. Wiring two T7770A3002 (10K ohm) Sensors to provide a temperature averaging network.
Fig. 28. Wiring two T7770A1006 (20K ohm) Sensors and one T7770A3002 (10K ohm) sensor to provide a temperature-averaging network
This thermostat is designed to, under normal use, automatically keep the 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 Once Functioning
See steps 1 through 4, in the Advanced Settings section, to set year, month, and day.
Setting Calendar When First Powered
When first powered, the thermostat proceeds through a sequence of screens to set the calendar. When first powered, the thermostat proceeds through a the sequence of screens to set the calendar. See Fig. 30.
Advanced Settings
The thermostat has advanced settings to match the HVAC system. These settings can be adjusted to match specific needs. There are two different groups of settings:
Installer Settings (Complete Set)
Access to the installer settings is obtained as follows:
User Settings (Simple Set)
Access to the user settings is obtained as follows:
INSTALLER SETUP NUMBERS (ISU), SETTINGS, AND TESTS (TABLE 6)
Use the Installer System Test to test the heating, cooling, and fan. Refer to the latter portion of Table 6.
CAUTION
Equipment Damage Hazard. Minimum compressor off time is bypassed during
Installer System Test
Avoid cycling compressors quickly.
IMPORTANT
Use Installer System Test to test heating, cooling, and fan. The setting was chosen for System Type (ISU 0170) can prevent some System Test Numbers from
appearing.
NOTE: Unless otherwise noted, setup items are accessible through only the Installer setup and not the User setup.
Table 6. Installer Setup Menu
Installer Setup Number | Installer Setup Name | Default Setting | All Settings | Notes |
0120a | Date (Year Upper) | 20 | 20—20xx 21—21xx | Available year range: 2001 – 2178 |
0130a | Date (Year Lower) | 04 | 00-99 | Available year range: 2001 – 2178 |
0140a | Date (Month) | 6 | 1-12 | |
0150a | Date (Day) | 15 | 1-31 (Month Dependent) | |
0160a | Schedule Options | 4 | 0—Non-Programmable 4—Programmable | |
0170 | System Selection | 8 | 1—1H/1C Conv 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 | |
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 programmable. Pre-occupancy purge enabled by nonzero duration. |
0190 | Reversing Valve O/B | 0 | 0—O (O/B On Cool) 1—B (O/B On Heat) | Only shown with heat pump system selected. |
0220 | 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. |
0230 | CPH for second stage compressor | 3 | 1-6 | Only shown if two stages of cool selected. |
0240 | 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. |
0250 | CPH for second stage conventional heat | 5 | 1-12 | Only shown with at least two stages conventional 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. |
Installer Setup Number | Installer Setup Name | Default Setting | All Settings | Notes |
0270 | CPH for Auxiliary 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 option is overridden and normal backlight operation 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 |
0320a | Temperature Indication Scale | 0 | 0—°F 1—°C | |
0330a | Daylight Saving | 2 | 0—Disabled 1—Enabled (US 1987) 2—Enabled (US 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 (allowing compressor lockout while displaying temperature). |
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) | 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 |
0360 | Heat Pump Auxiliary Lockout | 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) | 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. |
0535 | Temporary Occupied Duration Limit | 3 | 0—no duration 1—one hour 2—two hours 3—three hours 4—four hours | 0 means no limit |
0540a | Number of Periods | 4 | 2—2 Periods 4—4 Periods | 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. |
0580 | Minimum Compressor Off Time | 5 | 0—Off 2—2 minutes 3—3 minutes 4—4 minutes 5—5 minutes | Only shown if system has cool stages. |
0600 | Heat Temperature Range Stops | 90 | 40 to 90°F (4 to 32°C) | Only shown if system has heat stages. |
0610 | Cool Temperature Range Stops | 50 | 50 to 99°F (10 to 37°C) | Only shown if system has cool stages. |
Installer Setup Number | Installer Setup Name | Default Setting | All Settings | Notes |
0640a | 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 Lockout | 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 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.) |
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) |
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 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.) |
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 temperature and to the display temperature for indoor sensor (and remote indoor sensor) |
0710 | Restore Factory Defaults | 0 | 0—No 1—Yes | Resets all Installer Setup parameters to default values and resets the schedule to default. Retains only calendar settings and time. |
INSTALLER SYSTEM TEST ITEMS | ||||
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 Auxiliary Heat | 0 | 0—Auxiliary Heat Off 1—Auxiliary Heat On |
Fig. 34. Main screen selections.
PROGRAMMING
Table 7 shows the default program settings. Table 7. Energy-saving Default Program Settings
Schedule Period | Time | Setpoints | |
Heat | Cool | ||
Occ1 | 8:00am | 70°F (21°C) | 75°F (24°C) |
Unocc1 | 10:00pm | 55°F (10°C) | 85°F (29.5°C) |
Occ2 | — | — | — |
Unocc2 | — | — | — |
Auto: The fan runs only when the heating/cooling system is on. See the Fan Schedule section for more information.
On: Fan runs continuously.
Heat: The thermostat controls the heating system. Off: Both heating and cooling systems are off. Cool: The thermostat controls the cooling system.
Auto: Thermostat automatically changes between heat and cool operation, depending on indoor temperature
The thermostat can control up to four different scheduled periods per day:
OCC 1: Work arrival time. Period to keep space at a comfortable temperature.
UNOCC1: Work exit time. Period to keep space at an energy-saving temperature.
OCC 2: Second occupied period.
UNOCC2: Second unoccupied period.
NOTE: Available schedule times are at 15-minute intervals.
Editing Schedule
NOTES
Setting Time
IMPORTANT
The current day of the week should already be set correctly. If not, see the Advanced Settings section to set the day.
Setting Temperature Overrides
There are three temperature override options:
HOLD TEMPERATURE UNTIL
Holds the temperature temporarily until the time set by the user, or the next scheduled period time.
OVERRIDE
Changes temperature setting until the next period takes effect.
For use during Unoccupied periods.
HOLIDAY
Changes temperature setting for a designated number of days. Press MORE and then HOLIDAY. The screen shows “Hold Until 1 day”.
Fan Status Displayed on Main Screen
When the thermostat is running the fan, the fan blade symbol appears next to FAN to indicate the thermostat has the fan on.
NOTE: If the thermostat is not controlling the fan—typical for many gases, forced-air heating systems—the fan blade symbol will not appear even though the fan may be running.
Replacing Batteries
Not all thermostat models require batteries. If the thermostat has batteries, a low battery warning (see Fig. 38) flashes on the main screen for approximately 30 days.
NOTES
Replace the batteries as follows:
If connected to an installed remote indoor temperature sensor, the thermostat displays the indoor temperature from the remote sensor(s).
NOTE: If connected to an installed remote indoor temperature sensor, the thermostat internal sensor is not used.
ONE REMOTE INDOOR SENSOR INSTALLED
If one remote indoor temperature sensor is used, the screen showing the Inside temperature reading displays the temperature at the indoor remote sensor location.
MULTIPLE REMOTE INDOOR SENSORS INSTALLED
If more than one remote indoor sensor is used, the screen showing the Inside temperature reading displays the average of all the remote indoor sensors. Reading Outdoor Temperature
If connected to an outdoor sensor, the thermostat can display the Outside temperature.
VIEW OUTSIDE TEMPERATURE
View the outdoor temperature by pressing MORE until the outside temperature shows where the Indoor temperature was displayed. The word Outdoor will be displayed on the LCD.
Screen Locked Portions of the touch screen interface can be fully or partially locked. See the Advanced Settings section for information to use these features. When the thermostat displays LOCKED, the buttons are either fully or partially locked. Fully Locked Screen In this mode, the entire interface is locked and not functional. To unlock the screen, see the Advanced Settings section. The screen continuously displays SCREEN LOCKED
Partially Locked Screen
When partially locked:
PARTIAL LOCKOUT 1
This mode locks all keys except HOLIDAY, OVERRIDE, and temperature Up/Down arrows:
PARTIAL LOCKOUT 2
This mode locks all keys except HOLIDAY and OVERRIDE:
The thermostat is equipped with a feature to eliminate guesswork when setting a schedule. That is, the user need not know the amount of time for the HVAC system to bring the space to temperature (without overshoot) prior to the scheduled time. The thermostat manages that automatically. Simply set the program schedule to the desired time to have the space at comfort temperature. In addition, program the temperature to this comfort temperature. The thermostat activates the heating or cooling at the proper time to reach the scheduled temperature at the scheduled time.
NOTE: The setpoint changes gradually to use economical stages and avoid overshooting. For example—the space will be occupied at 8:00 AM and the desired temperature is 70°F. Set the OCC 1 period for 8:00 AM and 70°F. The thermostat turns on the heat prior to 8:00 AM to raise the temperature to 70°F by 8:00 AM. The thermostat provides an alert that the heating or cooling system is coming on before a scheduled time by displaying “Recovery” on the screen.
The thermostat has an adjustable Minimum-Off Timer that can be set from zero to five minutes (Factory Setting—five minutes). The Minimum-Off Timer can be bypassed through the Installer System Test or it can be bypassed permanently by setting the Minimum-Off Timer to 0 minutes in the Installer Setup. The Minimum-Off Timer is activated after the compressor turns off:
Heat Pump Temperature Lockouts
Dual Fuel Heat Pump and Outdoor Temperature Sensor In this operation, there is no external fossil fuel kit (dual fuel kit) installed; the thermostat controls this function:
OPERATION IN HEAT MODE ABOVE THE BALANCE POINT (OUTDOOR TEMPERATURE)
When the outdoor temperature is above the selected Balance Point Temperature (ISU 0350), only the compressor operates and the fan (G terminal) energizes when the thermostat calls for heat.
OPERATION IN HEAT MODE BELOW THE BALANCE POINT (OUTDOOR TEMPERATURE)
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) does not energize when the thermostat calls for heat. Heat Pump with Auxiliary (Backup) Heat and Outdoor
Temperature Sensor
Operation in Heat Mode
When the outdoor temperature is:
Operating Sequence
The thermostat energizes specific terminal(s), depending on the demand for heating, cooling or fan. The thermostat screen shows the time, inside temperature, system and fan selections. Additional indicators are shown when the heating, cooling or fan is energized. See Tables 8 and 9 for specification information.
Table 8. The sequence of Operation for Conventional Systems.
System Setting | Fan Setting | Call for Action | Energize Terminals | Screen Message |
Off | Auto | — | — | — |
Cool | Auto | — | — | — |
Cool or Auto | Auto | Stage 1 Cooling | Y, G | Cool On |
Cool or Auto | Auto | Stages 1 and 2 Cooling | Y, Y2a, G | Cool On |
Heat | Auto | — | — | — |
Heat or Auto | Auto | Stage 1 Heating | W, Gb | Heat On |
Heat or Auto | Auto | Stages 1 and 2 Heating | W, W2c, Gb | Heat On |
Table 9. The sequence of Operation for Heat Pump Systems.
System Setting | Fan Setting | Call for Action | Energize Terminals | Screen Message |
Off | Auto | — | O/Ba | — |
Cool | ||||
Cool or Auto | Auto | Stage 1 Cooling | Y, G, O/Ba | Cool On |
Stages 1 and 2 Cooling | Y, Y2b, G, O/Ba | |||
Heat | Auto | None | O/Ba | — |
Heat or Auto | Auto | Stage 1 Heating | Y, G, O/Ba | Heat On |
Stages 1 and 2 Heating | Y, W1c, G, O/Ba | Auxiliary Heat On | ||
Stages 1, 2 and 3 Heating | Y, Y2b, W1d, G, O/Ba |
Second Stage Heat and Cool Control
While maintaining a setpoint, several factors affect when 2nd stage energizes such as load conditions, environmental conditions, P+I control, and home insulation. The second stage energizes when the thermostat senses 1st the stage is running at 90% capacity. This operation is dropless control. Temperature Sensor Operation and Checkout Allow outdoor or indoor temperature sensors to absorb the air for a minimum of five minutes before taking a reading. See the Sensor instructions for more information.
NOTE: The C7089U, C7189U, and T7770A Temperature Sensors are calibrated at the factory and cannot be recalibrated in the field. C7089U Outdoor Temperature Sensor
When installed with Thermostat ISU 0340 set to 1 or 2, the thermostat can display the outside temperature.
Checkout
Allow C7089U Outdoor Sensor to absorb outdoor air for a minimum of twenty minutes before taking a reading. An accurate thermometer (±1°F [0.5°C]) measures the temperature at the sensor location, allowing time for the thermometer to stabilize before reading.To verify sensor resistance, remove one wire from one of the
C7089U 60-in. lead wires.
Use an ohmmeter to measure the resistance across the sensor. Then compare sensor accuracy with the temperature/resistance curve in Fig. 42. C7189U Remote Indoor Temperature Sensor
Operation
When installed with Thermostat ISU 0340 set to 3, the remote inside temperature is displayed on the Thermostat Home Screen as Inside Temperature. The thermostat’s internal temperature sensor is not used. The C7189U can be used to provide one remote sensor input or as a temperature-averaging network with multiple C7189U Sensors connected, as shown in Fig. 29.
Checkout
For best results, allow C7189U Wall Mount Temperature Sensor to absorb the air moving through the room for a minimum of twenty minutes before taking a resistance measurement.
An accurate thermometer (±1°F [0.5°C]) measures the temperature at the sensor location, allowing time for the thermometer to stabilize before reading. To verify sensor resistance, remove one wire from one of the C7189U wiring terminals. Use an ohmmeter to measure the resistance across the sensor. Then compare sensor accuracy with the temperature/resistance curve in Fig. 42.
Operation
When installed with Thermostat ISU 0340 set to 3 or 4, the remote inside temperature is displayed on the Thermostat Home Screen as Inside Temperature. The thermostat’s internal temperature sensor is not used. The T7770A can be used to provide one remote sensor input or as a temperature-averaging network with multiple T7770A Sensors connected, as shown in Fig. 26 through 28.
Checkout
For best results, allow T7770A Wall Mount Temperature Sensor to absorb the air moving through the room for a minimum of twenty minutes before taking a resistance measurement.
With an accurate thermometer (±1°F [0.5°C]) measures the temperature at the sensor location, allowing time for the thermometer to stabilize before reading. To verify sensor resistance, remove one wire from one of the wiring terminals. Use an ohmmeter to measure the resistance across the sensor. Then verify the sensor accuracy with the temperature/resistance in Fig. 43.
Table 10. 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 ISU 0600 and 0610; modify as needed. |
The keypad is fully locked. | Check ISU 0670 to change keypad locked options. | |
Heating or cooling does not come on. | Thermostat minimum off-time is activated. | Wait up to five minutes for the system to respond. |
System selection is not set to Heat or Cool. | Set system Selection to correct position. | |
System type Selection is incorrect. | Check ISU 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 ISU 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 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 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. | |
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). |
Heat pump puts out cool air in the heat mode and warm air in the cool mode. | Changeover Valve (ISU 0190) is not configured to match the changeover required by the installed heat pump. | Set Changeover Valve (ISU 0190) to match the changeover required by the installed heat pump. |
Both the heating and cooling equipment are running at the same time. | The heating equipment is not a heat pump but the System Type (ISU 0170) is set to Heat Pump. | Set System Type (ISU 0170) to match the installed heating and/or cooling equipment. |
Heating and cooling wires are shorted together. | Separate the shorted heating and cooling wires. |
Symptom | Possible Cause | Action |
Heating equipment is running in the cool mode. | Heating equipment is not a heat pump but System Type (ISU 0170) is set to Heat Pump. | Set System Type (ISU 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 (ISU 0170) is set to Heat Pump. | Set System Type (ISU 0170) to match the installed heating and/or cooling equipment. |
Cannot set the system setting to Heat. | System Type (ISU 0170) is set to Cool Only. | Set System Type (ISU 0170) to match the installed heating and/or cooling equipment. |
Cannot set the system setting to Cool. | System Type (ISU 0170) is set to Heat Only or Heat Only with Fan. | Set System Type (ISU 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 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 partially locked. | Check ISU 0670 to change keypad locked options. |
Perchlorate Material
This thermostat contains a Lithium battery which may contain Perchlorate material.
The following statement is required: Perchlorate Material—special handling may apply. See www.dtsc.ca.gov/hazardouswaste/perchlorate Automation and Control Solutions Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
® U.S. Registered Trademark
© 2011 Honeywell International Inc.
63-2636—03 M.S. Rev. 03-11
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