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 30 seconds.
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 30 seconds after the last cooling stage.
10. Take note of the room (and discharge) air tem-
peratures. If the analog output is set for Cooling,
press the Cooler button 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 operating.
11. Go back to programming step #14 and set the
setpoint 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 settings.
12. If using remote sensors, 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.
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 heating
LED is on, and at least one stage of cooling is on when-
ever 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 heating
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 cool-
ing 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
Initially, verify the wiring connections to check for prob-
lems (poor connections, opens, or shorts). If the tem-
perature is at a minimum or maximum reading, check
that the sensor dipswitch positions are correct as shown
in the Setup section of this document. Also, verify the
resistance reading for the sensor in question. A remote
sensor should read 1080 to 1090 ohms at room tem-
perature. The built-in sensor should read 108 to 109
ohms at room temperature. If any of the temperatures
are still reading slightly high or low, you can add in a
temperature offset (calibration) using Ubiquity or TCS
Insight. In Ubiquity, you can edit the calibration offset
for each temperature input (room, discharge, outdoor
air, etc.) on the controller's programming page. For
example, if the room temperature is reading 2 degrees
high, you would subtract 2 from the existing offset in
the room temperature calibration offset field and submit
the page. In TCS Insight, the process is similar. Refer
to the Calibrate Using TCS Insight Tech Bulletin # 1019
for details. As a last resort and only when directed to do
so by TCS technical support, you may be able to use
the on-board adjustment pots. Refer to the Thermostat
Sensor Calibration Tech Bulletin # 1005 for details.
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.
Analog Output Not Working Properly
Check wiring. A separate transformer should be used for
the SZ1018 and a separate transformer should be used
for the damper motor(s). Check to make sure that the
analog output is programmed correctly.
Check the Service Menu. The Mod Out Screen will tell
R
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
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