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Page 110
10.B.2 Combustion Setup Procedure
Hi-Fire, Low-Fire
The gas system must be set up properly, so the
boiler will run efficiently throughout its modulation range
under the installed conditions. This setup should only
be performed by a factory trained technician.
1. Set up a gas pressure gage (monometer) on the
incoming gas line. A test plug is provided on the back
of the boiler gas line. If the gas pressure is greater
than 10.5" w.c., turn off the main gas shut-off valve
upstream of the boiler and adjust or replace fuel
regulating components as necessary.
2. Locate the pressure adjustment on the Pressure
Regulating Gas Valve by removing the brass cap at
the top front of the unit. See Figure 43
3. Install a combustion analyzer at the boiler
exhaust duct.
4. On the touchscreen display navigate to
the O 2 screen and disable the O 2 Trim.
5. Provide a call for heat to terminals TT-1
and allow the system to sequence to the
Run State. Ensure that all inputs (Safety
Chain) are satisfied. See Digital Inputs /
Outputs in 8.E.2 on page 99
6. On the touchscreen display proceed to
the Manual Firing Rate Control Screen
and Enable the Manual Firing Control.
7. Select Firing Rate and set the Manual
Firing Rate to 100%.
Once in Run and firing at 100%,
check the CO 2 measurement on your
combustion analyzer. Be Patient! Give it
about 5 minutes to stabilize.
Also check the gas pressure at the inlet.
The gas pressure must be greater
than is 4" w. c. and less than 10.5"
See Table 23 on page 111.
w.c.
If gas pressure is not sufficient, shut
down system and update and/or repair
as necessary to achieve sufficient gas
pressure. Once adequate gas pressure
is achieved, start again a Step 1.
LAARS Heating Systems
Remove brass cap to access fuel
pressure adjustment screw
+
NOTE: A quarter turn only
per adjustment.
-
Figure 43. Fuel Pressure Adjustment Screw
100
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