Operation
3-6
IC-SA-1511 (02/2014)
V/LNV Series Manual
3.8 — Startup and Operating
3.8.1 — Gas Burners
A gas valve leak test (Bubble Test) must be performed on the automatic safety shutoff valves located in the
main gas train prior to any initial commissioning or subsequent maintenance of the burner and gas train
systems, where automatic valve proving systems interlocked with the main burner safety control are not
provided. This test should be performed periodically to ensure no leakage of valves in their closed or de-
energized position (refer to valve manufacturers procedures).
The unit should be taken out of service if the unit fails any part of the gas valve leak test. Any defective part
must be replaced prior to putting the equipment back into service.
1.
Close the main and pilot gas cocks.
2.
Make sure the ON-OFF switch is in the “OFF” position and the fuel selector switch is turned to “GAS.”
3.
Actuate the manual reset button of the flame safeguard control to close the safety switch contacts.
4.
Set the MANUAL-AUTO switch in the “MANUAL” position.
5.
Set the manual potentiometer in the low fire position.
6.
Open the gas pilot cock.
7.
Set the ON-OFF switch to “ON.” The burner will start and pre-purge. After pre-purge, the ignition
transformer and the gas pilot solenoid are energized. Before proceeding, conduct electrical interference
and pilot turndown tests if not previously done (see Section 3.2).
8.
On initial startup it is recommended that the main gas shutoff cock remains closed until the programmer
has cycled through pre-purge and pilot sequence. Then determine that the main gas valve opens. When
this is confirmed, turn the burner switch “OFF” and let the programmer finish its cycle.
Should a starting failure occur for any reason, combustible fumes may fill the combustion chamber. Never
attempt to re-light the burner under these conditions. The combustion chamber must first be purged before re-
lighting.
Keep fingers away from the combustion air intake below the damper. The damper is actuated with sufficient
force to cause severe injury. Always make high and intermediate rate adjustments when the burner has reached
low fire position. Do not disturb the low fire setting.
Failure to follow this startup procedure may result in explosion, fire, property damage, and personal injury. This
procedure must be performed only by authorized and qualified personnel.
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Warning
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Warning
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Warning