Low-High-Low system and the straight Oil Low-High-Low system
for specific adjustment details (pages 14, 16 and 18).
The oil side operation can be supplied with
either a Suntec or a Webster oil pump.
Refer to the mechanical operation for the
specific system for adjustment details.
Gas Full Modulation System with Oil Full Modulation System
The Gas system uses an automatic diaphragm or motorized gas
shutoff valve to control the on/off flow of the gas. The Oil system
employs an oil solenoid valve to control the on/off flow of oil to the
oil nozzle. A modulating motor controls the modulated positioning
of a butterfly type Gas Proportioning Valve while a V ported
metering oil valve provides the modulating function in the oil nozzle
return line. The modulating motor also controls the positioning of
the combustion air dampers, through appropriate sequencing -
providing low fuel/air input for a smooth low fire start and an infinite
number of fuel/air positions between full low and
high fire. Additional finite fuel/air adjustments are provided when
the optional Power Flame VaricamTM characterized fuel metering
system is used. (optional).
When firing Gas the oil metering valve will open and close
because it is linked to the modulating motor; however, the oil
solenoid shutoff valve remains closed, and so no oil is allowed to
flow to the nozzle. Similarly, when firing Oil, the butterfly gas valve
will open and close, because it is linked to the modulating motor;
however, the main automatic gas supply shutoff valve (motorized
or diaphragm type) remains closed, and so no gas is allowed to
flow to the burner head.
Refer to the mechanical operation of the Gas Full Modulation
system and the Oil Full Modulation system (pages 14 and 19, as
well as page 21 entitled Gas/Oil Linkage Arrangement Full
Modulation - Standard System) for specific adjustment detail. If
supplied, also refer to page 20, covering Detail and Adjustments
on Modulating VaricamTM Characterized Fuel Metering System.
Burner Start Up and Service Test Equipment Required
The following test equipment is required to ensure proper start-up
and adjustment of burner equipment to obtain maximum efficiency
and reliability of operation.
See page 36 for CO2/O2/Excess Air Curves
For Any Fuel
CO2 indicator or O2 analyzer
U-tube manometer or calibrated
gauge 0-30 vacuum/0-30 PSIG
Draft gauge or inclined
0-10 and 035 W.C. pressure
0-400# oil pressure gauge (two
required for internal bypass type
D.C. microammeter or D.C.
voltmeter, as required by Flame
Safeguard programmer selection
When firing gas fuels, it is possible to attain CO2
readings that appear to be acceptable (i.e., 8%, 9%,
condition. At such CO2 readings, a deficiency of air
will create the formation of CO (carbon 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.
5. GAS START UP
Refer to page 21 General Start Up Procedures - All Fuels and
Section 3 for mechanical operation detail of specific modes of
Combination Gas/Oil systems should also refer to page 22,
Information on Fuel/Air Modes of Operation for Combination
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 air inlet housing.
Air diffuser movement (fore and aft) may be necessary to produce
the best flame pattern or smoothest operation. See page 20 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 20 Gas or Gas/Oil Burner Fuel/Air
Premix Adjustment for further information.