MODEL 300 COMBUSTION ANALYZERInstruction 24-9223 3-153.7 CHANGING FUELSTo change fuels after an efficiency test has been run, proceed as follows:1. If not already stopped, stop the pump by pressing the RUN key.2. Press and hold the FUEL key. The left display shows what fuel ispresently being used in the combustion efficiency calculations.3. While holding down the FUEL key, repeatedly press the left SELECTkey until the desired fuel is shown in the left display.3.8 COMBUSTION ANALYZER SHUTDOWN AND STORAGEProceed as follows to shut down and store your Model 300 CombustionAnalyzer:1. If not already stopped, press RUN key to stop the analyzer’s pump.WARNING!Probe may be hot. To avoid burns, always handle the probe withheat-protective gloves.2. Remove probe from the stack or flue, and seal the sampling hole.CAUTION:Before storing probe inside case, allow probe to cool.3. To quickly cool the probe tube, draw cool ambient air through the tubeby pressing the RUN key to restart the pump. Allow pump to run untilprobe reaches room temperature; then press RUN key to stop pump.4. Unplug AC power cord and store in case, or set battery pack Powerswitch to OFF (see Figure 3-9).5. Empty the panel-mounted filter/trap and the probe-mounted particu-late trap as follows: