TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT
13 62-0223—1
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 operates heat or cool,
depending on indoor temperature.
Fan Settings
— Auto: Fan runs only when heating/cooling system on.
—On: Fan runs continuously.
NOTE: The default fan settings can only be changed
manually. They cannot be reprogrammed.
Table 5 shows default program settings. See Owner’s
Guide for complete instructions to change the program.
Table 5. Energy Star Default Program Settings.
a
The default fan settings can only be changed manually.
Minimum-Off Timer
(Compressor Protection)
The thermostat has an adjustable Minimum-Off Timer that
can be set from zero to five minutes (factory default: 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 (ISU 580). The Minimum-Off
Timer activates after the compressor turns off:
— If the thermostat is system powered (common wire),
the Minimum-Off Timer also activates upon initial
startup and after power interruptions.
— If there is a call for cooling or heating during the
Minimum-Off Time, the thermostat displays “Wait.”
— When the Minimum Off Timer expires, “Cool On” or
“Heat On” (heat pumps only)” appears in the display
and the compressor and fan turn on.
Outdoor or Indoor Temperature Sensor
When installing a temperature sensor:
1. Allow the sensor to absorb the air for a minimum of
five minutes before taking a reading.
2. See the instructions packed with the sensor for
more information.
NOTE: Only heat pump systems can provide more than
display of outdoor temperature.
Heat Pump Temperature Lockouts
Heat Pump with Auxiliary (Backup) Heat and
Outdoor Temperature Sensor
1. Choose correct heat pump application (ISU 0170).
2. Choose Outdoor Temperature Sensor for Control
(set ISU 0340 to 2).
3. Choose correct Compressor Lockout Temperature
(ISU 0350).
4. Choose the correct Auxiliary Lockout Temperature
(ISU 0360).
NOTE: There is a 5°F deadband between Compressor
and Auxiliary Heat lockout temperatures.
Operation in Heat Mode (Fig. 26)
When the outdoor temperature is:
— Below the Compressor Lockout Setting (ISU 0350):
— Only the Auxiliary Heat operates.
— The fan (G terminal) does not energize when the
thermostat calls for heat.
— Above the Auxiliary Lockout Setting (ISU 0360):
— Only the compressor operates.
— The fan (G terminal) energizes when the thermo-
stat calls for heat.
— Between the two temperatures, both the Compressor
and Auxiliary Heat operate.
Fig. 26. Heat Pump Operation with Lockout
Temperatures Set.
Schedule
Period Time
Setpoints
Fan
Setting
a
Heat Cool
Occ1 8:00am 70°F
(21°C)
75°F
(25.5°C)
On
Unocc1 10:00pm 55°F
(10°C)
85°F
(24°C)
Auto
Occ2 1:00pm 70°F
(21°C)
75°F
(25.5°C)
On
Unocc2 12:00pm
(Noon)
55°F
(10°C)
85°F
(24°C)
Auto
35
M19950
COMPRESSOR
LOCKOUT
TEMPERATURE
AUXILIARY
LOCKOUT
TEMPERATURE
COMPRESSOR ONLY
BOTH COMPRESSOR AND
AUXILIARY HEAT
AUXILIARY ONLY
50
OUTDOOR TEMPERATURE
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