HELIX VX-050 Installation, Operation & Maintenance Manual page 37

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 page 32.
• 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 - START UP PROCEDURE
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.
• Operate boiler for 10 minutes, prior to sampling
• Set boiler on high fire.
• Use ½, 1 or 2 cu ft dial on gas meter. Measure
• Calculate input.
Input (MBH)
Example: Gas flow from
Rate (MBH)
*Metric - See Glossary
2.
Compare measured input to table. Adjust input rate
if needed using Table 11 below.
Table 11 - Rate @ High Fire
Natural Gas and Propane
3. Measure CO
Adjust CO
37
with analyzer.
time required for one or more complete
revolutions. Measure time for 1-2 minutes.
3600 x
=
Meter = 2 cu ft
Measured time = 72 seconds
3600 x 2 cu ft
=
72 seconds
Rate @ High Fire
Size From
050 45
075 65
100 90
150 140
200 185
at high fire and compare to table.
2
if needed using figure 9-3. See figure
2
cu ft
seconds
= 100 MBH
To
51
76
102
153
204