Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler - Manual (Page 38)

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9.4 Boiler Start-up and Operational Test
1. Verify air is purged from hydronic piping
2. System test pumps - verify each pump is
operational
3. Verify gas piping
• Confirm pressure test. See section 7.3.
• Visually inspect piping to determine there are no
open fittings or ends, and all valves at unused
outlets are closed and plugged/capped.
• Purge air from piping
• Check piping and connections for leaks
immediately after gas is turned on. Shut off
gas supply and make necessary repairs if leaks
found.
4. Follow OPERATING INSTRUCTIONS to initiate boiler
operation. See section 10.
5. Inspect combustion air and vent piping. Verify pipe
is not leaking and terminations are unobstructed
and vent gas discharge is not a nuisance or hazard.
6. Verify boiler functions.
7. Inspect condensate disposal system. Verify
condensate flows adequately and is disposed
properly.
8. Check control module operation.
9. Check field sourced limits, low water cutoffs, etc.
per manufacturer's instructions.
9.5 Check Combustion
Natural Gas
1. Measure input. English units*
• Turn off gas to all other appliances.
• Activate some heating zones to dissipate heat.
• Set boiler on high fire.
• Use ½, 1 or 2 cu ft dial on gas meter. Measure
time required for one or more complete
revolutions. Measure time for 1-2 minutes.
• Calculate input.
Input (MBH) =
3600 x cu ft
seconds
Example: Gas flow from
Meter = 2 cu ft
Measured time = 72 seconds
Rate (MBH) =
3600 x 2 cu ft
= 100 MBH
72 seconds
*Metric - See Glossary
2. Compare measured input to table. Adjust input rate
if needed using Table 12 below.
Table 1 2 - Rate @ High Fire
Rate @ High Fire
Size From To
050 45 51
075 65 76
100 90 102
150 140 153
200 185 204
299 285 315
Natural Gas and Propane
3. Measure CO
2
at high fire and compare to table.
Adjust CO
2
if needed using figure 9-3 & 9-4. See
figures 9-5 and 9-6 for combustion air analyzer
port.
9 - START UP PROCEDURE