All installations and services must be performed by qualified service personnel.
For example, if a 13% CO2 (3.5% O2) is measured at a trace of smoke, open the air shutter until a zero smoke reading is obtained with a 12% CO2 or 4.5% O2.
The reason for recommending the lower CO2 setting even though it may result in slightly lower efficiency is it allows the burner to better tolerate uncontrollable variables, such as low oil temperatures, dirty oil, low heating content oil, a cold heat exchanger, and down draft conditions. This operational tolerance means less service and maintenance during heating seasons.
4.FLUE GAS TEMPERATURE: The flue gas temperature will vary to some degree depending on input rate, duct design, and the airflow across the heat exchanger. The suggested minimum NET stack temperature is 350° F, and the maximum stack temperature is 500° F. The lower the stack temperature, the higher the efficiency. However, stack temperatures under 350° F may cause condensation which in turn may lead to metal corrosion.
5.TEMPERATURE RISE: Supply air temperature minus return air temperature. The temperature rise across the furnace (operating at steady state conditions) should be 70°F. A higher temperature rise will slightly lower the efficiency. A lower temperature rise may cause condensing. The supply air temperature should be measured in the supply air trunkline approximately 12 inches down stream of the plenum.
NOTE: Minimum temperature rise is 55°; maximum temperature rise is 85°.
III. DEALER MAINTENANCE
A. TROUBLE SHOOTING:
THIS SECTION IS ONLY TO BE PERFORMED BY TRAINED, QUALIFIED SERVICE PERSONNEL, AND NOT BY THE FURNACE OWNER.
1.Check for 115VAC line supply voltage to the furnace. If there is no supply voltage, check fuses and service switch.
?CAUTION: When testing electrical equipment, always follow standard electrical procedures.
2.Make sure thermostat is calling for burner operation.
3.Check oil supply and make sure all valves are open.
The troubleshooting chart beginning on the following page should help identify the type of malfunction or deviation from normal operation. To use this diagram, just follow the instructions in the boxes. If the answer is yes or the condition is true, go down to the next box. If the answer is no or the condition is false, go to the box on the right. Continue checking and answering questions and conditions in each box until a problem and/or repair is found. After any maintenance or repair, the trouble shooting sequence should be repeated until normal system operation is achieved.
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