Gas Start Up - Power Flame C Series Installation & Operation Manual

Note:
When firing gas fuels, it is possible to attain CO
appear to be acceptable (i.e., 8%, 9%, 10%, etc.) while actually
producing an unsafe condition. At such CO
deficiency of air will create the formation of CO (carbon
5.

GAS START UP

Notice
Refer to page 23 General Start Up Procedures - All Fuels and Section 3 for mechanical operation detail of specific modes of burner
operations. Combination Gas/Oil systems should also refer to page 23, Information on Fuel/Air Modes of Operation for Combination
Gas/Oil Units.
General Information
Some applications may require the burner to function at
the low end of its rated capacity. As a result, the two
combustion air inlets may supply more air than is required
for efficient combustion. In such instances, it may be
desirable to operate the system using only one combustion
air inlet and one combustion air inlet damper. This may
be accomplished by removing cross connecting linkage
between dampers and locking the unused damper in a
fixed, closed position. One way of locking the damper is
to use a 10-24 machine screw through the hole in the
linkage arm, and drill and tap the air inlet housing, or use
two nuts on the screw and let the screw bear against the
Burner Start Up Sequence Instructions
1. Prior to burner start up - contact the local gas
company to determine if any correction factors have
to be applied to their indicated meter flow rates. This
information is important as relates to achieving specific
heat exchanger BTU/HR inputs. Refer to page 41 for
additional combustion analysis information and to
page 6 for firing rate information.
2. Refer to the gas piping diagram furnished with the
burner. Check gas piping, controls and valves for leaks
and compliance with codes.
3. Check all linkages. If the system is a packaged burner/
heat exchanger system, the linkage was probably set
when the system was test fired at the heat exchanger
manufacturer's factory. It should, however, be checked
to ensure that it was not damaged in shipment. On
conversion units (where the burner and heat exchanger
are mated in the field), the linkage will have to be set
to suit the particular operating conditions.
4. Do not secure flame safeguard control into its wiring
base until it has been determined that there are no
shorts or grounds in the system.
5. Remove the pilot assembly and check for proper
settings of the spark gap, tightness of electrode in its
bracket and firm connections of the electrode cable.
(See page 39 and 40.)
6. Close main, checking and pilot gas cocks. Install one
gas pressure gauge to read burner firing head pressure
(use a 0-10" W.C. gauge or a manometer). See Section
3 for pressure sensing locations. Install a second gas
pressure gauge to read gas supply pressure between
the main gas cock and the inlet to the main gas pressure
regulator (use a 0-35" W.C. gauge or as appropriate).
If there is no tapping in this location, install a tee at the
point where the pilot gas supply is connected to the
main gas line. Slowly open the main gas cock in order
readings that
2
readings, a
2
monoxide) in the flue gases. Therefore, when firing gas, test for
CO to make certain that the burner is adjusted so that it has an
excess, rather than a deficiency, of air. CO is a dangerous
product of incomplete combustion and is associated with
combustion inefficiency and increased fuel cost.
air inlet housing.
Air diffuser movement (fore and aft) may be necessary to
produce the best flame pattern or smoothest operation.
See page 22 Gas, Oil or Gas/Oil Burner Diffuser Adjustment
for further information.
Gas and Gas/Oil burners for Scotch marine and other
selected applications incorporate a gas/air premix
adjustment. This adjustment is identified by diametrically
opposed adjustment knobs on the blast tube. See page 22
Gas or Gas/Oil Burner Fuel/Air Premix Adjustment for
further information.
to determine that the incoming gas pressure is within
the specified limits of the main and pilot gas pressure
regulators, automatic fuel valves and gas pressure
switches. Many systems are rated for a maximum gas
supply pressure of 14" W.C. If pressure exceeds this
value, consult the first page of the Burner Specification
Sheet and/or gas component product bulletins supplied
with the burner to ensure that the supplied system can
operate properly at the elevated supply pressure.
7. Disconnect pilot line at inlet to the pilot gas pressure
regulator and purge air from the pilot gas line. Purging
of gas lines must be done in accordance with NFPA
54 of the National Fire Protection Association's
National Fuel Gas Code. After the air is purged from
the gas supply system, close the pilot cock and
reconnect the pilot line. Leave the pilot cock closed.
8. Install required system measuring devices:
a) appropriate flame signal meter to the flame safeguard
control; b) manometer (or 0-10" W.C. gauge) in the pilot
test tee port: c) stack thermometer and CO
line to the breaching; and d) draft gauge to the
combustion chamber test point.
9. It is strongly recommended that an automatic gas valve
bubble leak test be performed in accordance with the
gas valve manufacturer's instructions on every new
installation and periodically afterwards in order to
ensure that the valve is functioning according to the
manufacturer's specifications. It is also suggested that
the test be conducted during a normal prepurge burner
operation. This test will reveal any problems that relate
to incorrect wiring of the automatic gas valve that could
cause premature energization of the valve.
* Note: Although Underwriters Laboratories permits higher
readings of CO (Carbon Monoxide), it is desirable to obtain
readings between 0 and 100 PPM, depending on local codes
and heat exchanger manufacturer's recommendations.
C25
Rev.304
or O sample
2 2