Harsco Industrial 1004905923 Installation & Owner's Manual page 30

checked using a combustion analyzer at start-up to verify that the combustion is proper. Remove the exhaust
vent plug and place the analyzer probe in the exhaust as shown. Be sure to replace the plug after combustion
has been set.
Start the boiler. Using the control panel, access the SERVICE menu. The service menu allows the operator to
manually set the boiler to HI or LOW operation for setup and/or troubleshooting. Pressing the SVC shortcut key
(DOWN button when the default screen is present) accesses the SERVICE menu. Users can also access the
SERVICE menu by pressing the MENU button and using the UP and DOWN buttons until the cursor is next to
SERVICE. Press ENTER.
Service Service Service
BNR ON Test HI LOW BNR ON Test HI LOW BNR ON Test HI LOW
BNR OFF Fan HI LOW BNR OFF Fan HI LOW BNR OFF Fan HI LOW
Two test modes are available:
1) BNR ON TEST HI LOW
2) BNR OFF FAN HI LOW
The first test mode allows the service technician to hold the boiler in high or low fire during operation so that the
combustion adjustment can be performed. Press the UP or DOWN button to select BURNER ON or BURNER
OFF, press ENTER. Then press the UP button followed by ENTER to select HIGH or DOWN followed by ENTER
to select LOW operation.
The second test mode checks the fan rate with the burner off at high speed or at low speed.
These test modes will automatically terminate after 15 minutes of inactivity or can be terminated from the
control/display panel by pressing the cancel/reset button
If the % O is not within the range above at high fire, the gas valve should be adjusted. To adjust the gas valve on
2
hi fire, turn the bottom screw "V" counterclockwise to reduce the % O
Once high fire is adjusted, place the boiler in low fire using the control panel and adjust the % O
turning the top screw "N" counterclockwise to reduce the % O
NOTICE! For High altitude adjustments contact Harsco Industrial, Patterson-Kelley Technical service for
Service Bulletin No. 05-08.
®
MODU-FIRE Forced Draft Gas-Fired Boiler 2500-3000
or turn it clockwise to raise the % O
2
or clockwise to increase the % O
2
30
.
2
if necessary, by
2
.
2