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The internal temperature sensor installed in this controller has been calibrated and should not require further adjustment. The thermostat may be calibrated with trim screw through hole provided on dial face under the setpoint knob. Avoid undue pressure on trim screw. Adjustments are very slight and 1/8 turn either way is usually adequate. Place thermometer next to controller and let it stabilize to ambient temperature. Unplug fans or CO2 equipment from controller during this procedure. The controller should remain plugged in with switch “on”. Outlet light will indicate switch points. Turn thermostat knob to the left until exhaust outlet indicator light comes “on”. Slowly turn knob back to the right until light switches back to the equipment outlet side. This point should match the temperature reading on the thermometer. If not, turn knob back to the left, adjust trim screw very slightly and turn knob right again to re-check switch point temperature. When switch point temperature matches that of thermometer calibration is complete. During adjustment, pressure on trim screw will cause incidental switching. This is normal and has no affect on adjustment procedure.
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