TB8220 COMMERCIAL VISIONPRO™ PROGRAMMABLE THERMOSTAT
63-2625—3
20
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 SCREEN
LOCKED, the touch screen interface is either fully or partially
locked.
Fully Locked Screen
In this mode, the entire interface is locked and not functional.
To unlock screen, see the Advanced Settings section. The
screen continuously displays SCREEN LOCKED.
Partially Locked Screen
When partially locked:
— Pressing a locked key prompts the screen to indicate
SCREEN LOCKED for five to seven seconds.
— Pressing an unlocked key with SCREEN LOCKED active
removes SCREEN LOCKED from the display.
PARTIAL LOCKOUT 1
This mode locks all keys except HOLIDAY, OVERRIDE, and
temperature Up/Down arrows:
— User can change the temperature setpoint, but cannot
change schedule settings.
— The temporary temperature change lasts until next
scheduled period. The screen displays that time.
— User can change the temperature setpoint, but cannot
change schedule settings.
— Pressing HOLIDAY sets the temperature to the Unoccupied
setting for the selected period of time. The next Occupied
period switches back to the program settings.
— Pressing OVERRIDE sets the temperature to the Occupied
setting for the selected period of time. The next Unoccupied
period switches back to the program settings.
— To cancel the temperature override and follow the
programmed schedule, press CANCEL.
— To unlock the screen, see Advanced Settings section.
PARTIAL LOCKOUT 2
This mode locks all keys except HOLIDAY and OVERRIDE:
— Pressing HOLIDAY sets the temperature to the Unoccupied
setting for the selected period of time. The next Occupied
period switches back to the program settings.
— Pressing OVERRIDE sets the temperature to the Occupied
setting for the selected period of time. The next Unoccupied
period switches back to the program settings.
— To cancel the temperature override and follow the
programmed schedule, press CANCEL.
— To unlock the screen, see Advanced Settings section.
Temperature Recovery
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 overshoot.
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.
Minimum-Off Timer Compressor Protection
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:
— If the thermostat is system powered (common wire), the
Minimum-Off Timer is also activated 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 solidly in the display and
the compressor and fan turn on.
Economizer/TOD Logic (Table 8)
Table 8. Operation of Terminal A.
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:
1.
Choose correct heat pump application in ISU 0170.
2.
Choose
Outdoor Temperature Sensor for Heat Pump
Temperature Lockouts
Option
in ISU 0340.
3.
Choose appropriate
Balance Point Temperature
in
ISU 0350.
OPERATION IN HEAT MODE ABOVE 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 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.
Effective
Occupancy
Call for
Cool
Terminal A
Economizer
TOD
Occupied
—
Energized
Energized
Unoccupied Yes
Energized
De-energized
No
De-energized
De-energized
Override
—
Energized
Energized
