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FIGURE 9-5 Offset Screw Location - Models
050/075/100/150/200 MBH
White Plastic Offset
Screw Is Located
Under The Aluminum
Cap
FIGURE 9-6 Offset Screw Location - Model 299 MBH
9 - START UP PROCEDURE
White Plastic Offset
Screw Is Located
Under The Aluminum
Cap
42
LOW fire combustion - 50/75/100/150/200 MBH
CO2
Gas
Min
Max
Natural
8.8%
9.3%
Gas
Propane
9.8%
10.5%
LOW fire combustion - 299 MBH
CO2
Gas
Min
Max
Natural
8.8%
9.2%
Gas
Propane
9.8%
10.5%
4.
See Figures 9-5 and 9-6 for location of Offset Screw on
modulating gas valve of various boiler models. T40 male
Torx bit is necessary for removal of Offset Screw cap and
adjustment of Offset Screw.
5.
Set boiler to High Power using System Test to confirm
combustion in High Fire (Step 2).
6.
Combustion setting is now complete.
A. Exit System Test mode by pushing Enter. High Power
will start flashing.
B. Scroll down to "OFF". Push Enter button "OFF" stops
flashing.
C. Push Menu button twice to escape Installer Manual.
Boiler returns to CH mode or DHW mode depending
on type of call for heat available.
7.
Check ignition quality 4 times with front jacket off. Close
internal manual gas valve for 5 seconds and then re-open
it. Boiler will go through post purge – prepurge – ignition
sequence. Reset boiler if boiler goes into lockout.
8.
Check ignition quality 4 times with the front jacket on.
Close the external gas shutoff valve for 5 seconds and
re-open it. Boiler will go through a post purge – prepurge
– ignition sequence. Reset the boiler if boiler goes into
lockout.
Flame
signal
CO
Design
Target
9.0%
<100ppm
>3.3
10.0%
Flame
signal
CO
Design
Target
9.0%
<100ppm
>4.5
10.0%
PN 240011320 Rev. G 10/01/2021]
μA
μA
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