Bard WH422D Installation Instructions Manual

Manual 2100-443Page 19CHECKING TEMPERATURE SENSOROUTSIDE UNIT CIRCUIT1. Disconnect temperature sensor from board and fromoutdoor coil.2. Use an ohmmeter and measure the resistance of thesensor. Also use ohmmeter to check for short oropen.3. Check resistance reading to chart of resistance. Usesensor ambient temperature. (Tolerance of part is± 10%.)4. If sensor resistance reads very low, then sensor isshorted and will not allow proper operation of theheat pump control.5. If sensor is out of tolerance, shorted, open or readsvery low ohms then it should be replaced.TEMPERATURE F VS. RESISTANCE R OF TEMPERATURE SENSORF R F R F R-25.0-24.0-23.0-22.0-21.0-20.0-19.0-18.0-17.0-16.0-15.0-14.0-13.0-12.0-11.0-10.0-9.0-8.0-7.0-6.0-5.0-4.0-3.0-2.0-1.00.01.02.03.04.05.06.07.08.09.010.011.012.013.014.015.016.017.018.019.020.021.022.023.024.0196871190099183585177318171289165487159904154529149355144374139576134956130506126219122089118108114272110575107010103574100260970649398191008881398537182699801217763275230729107067068507664186439962449605655874556985552845364052051505144902847590462004485543554422954107725.026.027.028.029.030.031.032.033.034.035.036.037.038.039.040.041.042.043.044.045.046.047.048.049.050.051.052.053.054.055.056.057.058.059.060.061.062.063.064.065.066.067.068.069.070.071.072.073.074.0398983875737652365833554834545335743263431723308402998629157283552757726823260922538324696240302338422758221502156120989204351989619374188671837517898174341698416547161221571015310149211454414177138201347413137128101249212183118831159111307110311076275.076.077.078.079.080.081.082.083.084.085.086.087.088.089.090.091.092.093.094.095.096.097.098.099.0100.0101.0102.0103.0104.0105.0106.0107.0108.0109.0110.0111.0112.0113.0114.0115.0116.0117.0118.0119.0120.0121.0122.0123.0124.010501102471000097609526929990778862865384498250805778697686750773347165700068406683653163836239609859615827569755705446532652085094498248734767466345624464436742744182409340063921383837573678360135263452