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2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
13
Fan does not Come on
The fan is on whenever the fan LED is on. If the fan
should be on, but the fan LED is off, check the fan and
system switch modes, and the unoccupied fan mode
in programming. If the fan is off but the fan LED is on,
check wiring. Short terminals “R” to “G” and see if the
fan comes on. This is a check for a mechanical relay
failure.
heating or Cooling does not Come on
At least one stage of heating is on whenever the heat-
ing LED is on, and at least one stage of cooling is on
whenever the cooling LED is on. If heating or cooling
should be on but the heating or cooling LED is off, check
the fan and system switch modes. Also, check the heat-
ing and cooling setpoints, offsets and differentials, and
the room temperature to be sure heating or cooling
should be on. If using outdoor air heating and cooling
lockouts, or discharge air high and low limits, check
their values to be sure heating or cooling is allowed. If
heating or cooling is off, but the corresponding LED is
on, check the wiring. Short terminals “R” to “Y/W1” or
“Y/W2” and see if the heating or cooling comes on. This
is a check for a mechanical relay failure.
Wrong temperature display
If any of the temperatures are reading slightly high or low,
there are three adjustment pots located in the cover to
adjust them. “T1” is for the room temperature, “T2” is for
the discharge air temperature, and “T3” is for the outdoor
air temperature. If the temperature is at a minimum or maxi-
mum reading, check the sensor dipswitch positions. (See
setup instructions.) Check for wiring problems (opens or
shorts). A remote 1000
Ω
sensor should read 108 to 109
Ω
at room temperature.
T1
T2
T3
1 2
1 2 3 4 5
adjust display contrast
Service led is on
If the service LED is on, it may be for monitoring purpos-
es or it may indicate a critical problem. The first monitor-
ing screen accessed by pressing the service status but-
ton will display why the light is on.
outputs Will not Shut off
First check the room temperature and the setpoints and
determine whether the output should be on. There are
delays and minimum on and off times for the fan and
heating and cooling stages. Also, check the service
status menus to verify that the outputs are on. Turning
the system to “off” will instantly turn all outputs off. The
thermostat can be reset by pressing the system switch
button and the service status button simultaneously.
the WARMER (up) button. The setpoint adjustment
screen should now be showing. Press the WARMER
button until the heating setpoint is greater than the
current temperature by at least five degrees. The fan
will come on. The heating stage(s) will sequence on
after 30 seconds.
7. Press the cooler (down) button until the heating set-
point is one degree less than the current tempera-
ture. The heating stage(s) will sequence off. The fan
will turn off 2 minutes after the last heating stage.
8. Press the cooler button until the cooling setpoint is
less than the current temperature by at least five
degrees. The fan will come on. The cooling stage(s) will
sequence on after 2 minutes.
9. Press the warmer button until the cooling setpoint is
greater than the current temperature by one degree.
The cooling stage(s) will sequence off. The fan will
turn off 2 minutes after the last cooling stage.
10. For a heating or cooling analog output: Take note
of the room (and discharge) air temperatures. If the
analog output is set for Cooling, press the Cooler but-
ton until the cooling setpoint is less than the current
room temperature by at least 5°. The cooling device
should start operating. If the analog output is set for
Heating, press the Warmer button until the heating
setpoint is greater than the current room temperature
by at least 5°. The heating device should start operat-
ing.
11. For an economizer analog output: Take note of the
discharge and outdoor air temperatures. Go to pro-
gramming step #42 and set the outdoor air setpoint
5° greater than the outdoor air temperature. Go to
programming step #43 and set the discharge air
setpoint 10° less than the discharge air temperature.
Press the Cooler button until the cooling setpoint is
less than the current room temperature by at least
5°. The damper should now be fully open. Raising
the discharge air setpoint, will modulate the damper
closed. Raising the cooling setpoint above the room
temperature or lowering the outdoor air setpoint
below the outdoor air temperature will shut the damp-
er to minimum position.
12. Go back to programming step #20 and set the set-
point adjust limit back to the desired value. Make any
other changes in programming, clock, and schedule.
Set the fan and system modes to their desired set-
tings.
13. If using remote sensor(s), verify that the reading is
correct. If not, see
Wrong Temperature Display
in
troubleshooting
section.
tRoUBleShooting
no display
Check for 24 VAC on terminals “+24” and “-24”. Check
the cable connecting the cover to the base for a good
connection.
