TCS Basys Controls SZ1041A Product Manual

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TCS Basys Controls SZ1041A Product Manual Manual pdf 13 page image

R2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com13Fan does not Come onThe fan is on whenever the fan LED is on. If the fanshould be on, but the fan LED is off, check the fan andsystem switch modes, and the unoccupied fan modein programming. If the fan is off but the fan LED is on,check wiring. Short terminals “R” to “G” and see if thefan comes on. This is a check for a mechanical relayfailure.heating or Cooling does not Come onAt least one stage of heating is on whenever the heat-ing LED is on, and at least one stage of cooling is onwhenever the cooling LED is on. If heating or coolingshould be on but the heating or cooling LED is off, checkthe fan and system switch modes. Also, check the heat-ing and cooling setpoints, offsets and differentials, andthe room temperature to be sure heating or coolingshould be on. If using outdoor air heating and coolinglockouts, or discharge air high and low limits, checktheir values to be sure heating or cooling is allowed. Ifheating or cooling is off, but the corresponding LED ison, check the wiring. Short terminals “R” to “Y/W1” or“Y/W2” and see if the heating or cooling comes on. Thisis a check for a mechanical relay failure.Wrong temperature displayIf any of the temperatures are reading slightly high or low,there are three adjustment pots located in the cover toadjust them. “T1” is for the room temperature, “T2” is forthe discharge air temperature, and “T3” is for the outdoorair temperature. If the temperature is at a minimum or maxi-mum reading, check the sensor dipswitch positions. (Seesetup instructions.) Check for wiring problems (opens orshorts). A remote 1000 Ω sensor should read 108 to 109 Ωat room temperature.T1T2T31 21 2 3 4 5adjust display contrastService led is onIf 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 offFirst check the room temperature and the setpoints anddetermine whether the output should be on. There aredelays and minimum on and off times for the fan andheating and cooling stages. Also, check the servicestatus menus to verify that the outputs are on. Turningthe system to “off” will instantly turn all outputs off. Thethermostat can be reset by pressing the system switchbutton and the service status button simultaneously.the WARMER (up) button. The setpoint adjustmentscreen should now be showing. Press the WARMERbutton until the heating setpoint is greater than thecurrent temperature by at least five degrees. The fanwill come on. The heating stage(s) will sequence onafter 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 fanwill turn off 2 minutes after the last heating stage.8. Press the cooler button until the cooling setpoint isless than the current temperature by at least fivedegrees. The fan will come on. The cooling stage(s) willsequence on after 2 minutes.9. Press the warmer button until the cooling setpoint isgreater than the current temperature by one degree.The cooling stage(s) will sequence off. The fan willturn off 2 minutes after the last cooling stage.10. For a heating or cooling analog output: Take noteof the room (and discharge) air temperatures. If theanalog output is set for Cooling, press the Cooler but-ton until the cooling setpoint is less than the currentroom temperature by at least 5°. The cooling deviceshould start operating. If the analog output is set forHeating, press the Warmer button until the heatingsetpoint is greater than the current room temperatureby at least 5°. The heating device should start operat-ing.11. For an economizer analog output: Take note of thedischarge and outdoor air temperatures. Go to pro-gramming step #42 and set the outdoor air setpoint5° greater than the outdoor air temperature. Go toprogramming step #43 and set the discharge airsetpoint 10° less than the discharge air temperature.Press the Cooler button until the cooling setpoint isless than the current room temperature by at least5°. The damper should now be fully open. Raisingthe discharge air setpoint, will modulate the damperclosed. Raising the cooling setpoint above the roomtemperature or lowering the outdoor air setpointbelow 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 anyother 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 iscorrect. If not, see Wrong Temperature Display introubleshooting section.tRoUBleShootingno displayCheck for 24 VAC on terminals “+24” and “-24”. Checkthe cable connecting the cover to the base for a goodconnection.

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