Dunkirk Helix VX Vertical Laser Tube Wall Hung Stainless Steel Modulating Condensing Boiler - Manual (Page 39)

39
9 - START UP PROCEDURE
Natural Gas and Propane
3. Measure CO
2
at high fire and compare to table.
Adjust CO
2
if needed using figure 9-3. See figure
9-5 for combustion air analyzer port.
High Fire Combustion - 50/75/100/15/200 MBH
Gas
CO
2
Design
Target
CO
Flame
Signal
Min. Max. μA
Natural Gas 9.0 9.5% 9.5%
<200ppm 6.5-7.5
Propane 10.0 11.0 11.0%
Low Fire Combustion - 50/75/100/15/200 MBH
Gas
CO
2
Design
Target
CO
Flame
Signal
Min. Max. μA
Natural Gas 8.8 9.3% 9.0%
<100ppm >3.3
Propane 9.8 10.5 10.0%
NOTICE
Contact Technical Support @ 800-325-5479 for
additional information or assistance.
Natural Gas only
4. Measure input. Compare to table 11. Continue to
measure input and CO
2
until both measured values
are within range specified in tables .
Propane Gas
Most propane systems do not have flow meters.
1. Check CO
2
. Propane should be between 10% and
11.0%.
• If CO
2
is low increase gas flow following figure
9-3.
• If CO
2
is high decrease gas flow following figure 9-3.
1/4" Flat Head
Screwdriver
FIGURE 9-3 Gas Valve - Models
• To increase gas flow turn 'throttle' left or counter
clockwise .
• To decrease gas flow turn 'throttle' right or
clockwise .
• Limit adjustment to one turn and retest.
Verify Burner, Proper Operation
1. Inspect burner flame through Sight Glass. See
figure 11-1.
2. Operate boiler through several heating cycles,
including domestic hot water, if used. Verify proper
operation.