2
Prepare boiler
14
DIR #2000582949 00
DIR #2000582949
00
DIR #2000582949 00
DIR #2000582949
00
ALLEN
WRENCH
ADJUSTMENT
SCREW
Figure 2-3
Gas Valve Adjustment - Models 400-500
10.
For Models 400-500:
Remove the front panel from the
unit (no tools required for removal).
For Models 650-1000:
Remove the top access cover from
the unit (no tools required for removal).
11.
For Models 650-1000:
Remove the cover on top of the gas
valve (FIG. 2-4).
12. Use a combustion analyzer to verify CO
2
is within the range
of 9.4 – 10.4%. If not, adjust the screw
counterclockwise
incrementally to raise CO
2
and
clockwise
to lower CO
2
(FIG. 2-3 and 2-4).
13. Replace the gas valve cover and access covers.
14. Replace the front access panel removed in Step 1 and
resume operation.
COVER
ALLEN WRENCH
ADJUSTMENT SCREW
Figure 2-4
Gas Valve Adjustment - Models 650 - 1000
⚠
WARNING
After converting to LP, check combustion
per the Start-up procedure in Section 11
of this manual. Failure to check and verify
combustion could result in severe personal
injury, death, or substantial property
damage.
Installation & Operation Manual
Combustion air filter
This unit has a standard air filter located at the combustion air
inlet. This air filter is provided to help ensure clean air is used
for the combustion process. Check this filter every month and
replace when it becomes dirty. You can find these commercially
available filters at any home center or HVAC supply store.
Filters by model sizes:
KBX0400-1000 / 12 x 12 x 1 filter
Note: Replacement filter should have a MERV rating no greater
than 4.
Follow the steps below when replacing the combustion air filter:
1. Locate the combustion air filter box.
2. Lift and remove the air filter box cover to gain access to the
air filter.
3. Slide the air filter out the top of the air filter box.
4. Inspect the air filter for dirt and debris, replace if necessary.
5. Replace the air filter and the air filter box cover.
