Lochinvar 81-286 service manual Combustion Analysis Procedure

Combustion Analysis Procedure

1.Turn the main power off to the boiler by placing the “On/Off” switch in the OFF position.

2.Remove the flue temperature sensor from the flue pipe connection. Note: Combustion measurements will be made at this point.

3.Turn the main power on to the boiler by placing the “On/Off” switch in the ON position.

4.Place the boiler into the active position by pressing the RIGHT SELECT [ON] key (see page 7).

5.Locate the pinhole button below the RESET button on the display board (see page 7). Insert a thin wire (such as a paper clip) into the hole and press the button once and hold for 5 seconds to place the boiler into Service Mode. In Service Mode the boiler will fire at ignition speed and will then modulate up to full fire.

6.Insert the probe from a combustion analyzer into the hole left by the removal of the flue temperature sensor.

7.Once the boiler has modulated up to full fire, measure the combustion. The values should be in the range listed in Table 3-5 above. The CO levels should be less than 150 ppm for a properly installed unit.

If the combustion is not within the specified range, reference the chart below for possible causes and corrective actions.

Table 3-5Flue Products

8.Once the combustion analysis is complete, test the safety shutoff device by turning the manual shutoff switch to the OFF position and ensuring that the boiler shuts down and registers an alarm. Turn the manual shutoff switch to the ON position, reset the control, and return to Service Mode.

9.Turn the main power off to the boiler and replace the flue temperature sensor into the flue pipe connection.

10.Place the boiler back into normal operation.

￿WARNING You must replace the flue gas temperature sensor to prevent flue gas spillage into

the room. Failure to comply could result in severe personal injury, death, or substantial property damage.