33
iN401 - iN501 Adjusting
CO2
Level
May
2019
-
Revision
00
NOTICE
Do NOT change the blower speed settings. This adjustment
MUST be performed by factory personnel ONLY. Changing
this setting WILL VOID the warranty!
5. Create a hot water flow of at least 6.0 GPM as shown on
the display screen.
Note:
If flow rate is inadequate, a pop-up message will notify
to increase the flow.
6. At at a flow rate of 6.0 GPM, Top Heat Engine will start.
7. Allow three minutes of operation at High Fire.
8. Record “initial output” in Hire Fire Recorded Values table.
9. If the CO
2
values are within appropriate range, proceed to
Step 10, otherwise continue.
a. Use a flat blade screwdriver to turn the High Fire
screw clockwise to decrease and counterclockwise to
increase the CO
2
value.
b. Adjust in ¼ turn increments.
c. Wait three minutes to stabilize flue gas readings and
recheck values.
d. Adjust until values fall with specified range.
High Fire Screw
10. Once the desired values are achieved, record the new
High Fire CO
2
“adjusted values” in the table.
CO
2
and CO Standards
Description
CO
2
Range
Max. CO Level
Natural Gas High Fire
9.1% to 9.3%
< 200 ppm
Propane High Fire
10.1% to 10.5%
< 200 ppm
High Fire Recorded Values
Date ____ / ____ / _______
Heat Engine
(TOP)
Initial Output
Adjusted Value
CO
2
Value %
Max CO ppm
Heat Engine
(BOTTOM)
Initial Output
Adjusted Value
CO
2
Value %
Max CO ppm
11. From the display screen, press Bottom Heat Engine and
repeat the High Fire procedure for all heat engines.
