HELIX VX-399 Installation, Operation & Maintanance Manual page 35

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 using vibration, noise and amp draw.
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. Confirm there is a steady
gas supply to the boiler.
• 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 Firing Rate
1.
Measure input, if a gas meter is installed in the
system.
• 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 two or more complete
revolutions. Measure time for one or more
minutes.
• Calculate input.
For Natural Gas :
Input (MBH) =
Example: Natural Gas - Gas flow from
Meter = 2 cu ft
Measured time = 18 seconds
Rate (MBH) =
9 - START UP PROCEDURE
3600 x cu ft
seconds
3600 x 2 cu ft
= 400 MBH
18 seconds
For Propane (LP):
Input (MBH)
For Metric formulas- See Glossary
2.
Compare measured input to Table 12. If calculated
input is not in range given in Table 12, check firing
rate again after setting the combustion following
steps in section 9.6.
Table 12 - Rate @ High Fire
Rate @ High Fire
Size
399
9.6 Combustion Adjustment
Calibrated Combustion Analyzer is necessary for the
following combustion adjusment.
Before setting combustion in HIGH fire, activate all
heating zones to dump heat generated by the boiler
running on high fire.
1. Enter installer menu (Enter + Menu buttons for 4
seconds).
A. Scroll down to System Test.
B. Push Enter button to enter System Test. When
"System Test Off" displays, push Enter button and
"Off" will start flashing.
C. Scroll up to High Power and push Enter. "High
Power" will stop flashing and becomes solid.
D. Unit is now locked in high fire.
35
9160 x cu ft
=
seconds
From To
380 407
NOTICE
P/N 240010943, Rev. C [09/07/2016]