Lochinvar knight 81-286 사용자 설명서

        

                       Service Manual

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.

8.0% - 10%

3.0% - 6.5%

9.0% - 11%

4.1% - 6.9%

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.

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.

 WARNING

120 vac input to the main control board has 
dropped below 80 vac.

•  Check 120 vac supply to the transformer.

• Check wiring connections at the low voltage 
 terminal 

strip.

•  Check the wire size/length to remote devices.

•  Replace the transformer.

The main control board has detected an 
internal fault.

•  Replace the main control board.

The main control board has detected an 
internal fault.

•  Replace the main control board.

The main control board has detected an 
internal fault.

•  Replace the main control board.

The main control board has detected an 
internal fault.

•  Replace the main control board.