Specifications
Gas burners - INDITHERM
MAXON UNITED STATES - MAXON EUROPE - MAXON ASIA - WWW.MAXONCORP.COM
E 2.160.13
3/05
All data shown on this page are subject to change without notice.
To start-up an INDITHERM burner for the first time
Close main gas cock and pilot gas cock.
Establish correct blower direction of rotation. Observe direction of rotation of
blower motor (rotating towards blower discharge as per arrow on blower housing).
The direction in which the motor shaft is rotating can be easily determined by
momentarily energizing the motor circuit. As the motor slows to a stop, watch the
shaft at the point where it is connected to the impeller. If the impeller turns back-
wards when 3-phase alternating current is used as the power supply, reverse any
two of the leads and recheck for correct rotation.
Disconnect automatic control motor.
Disconnect wiring between control motor and burner control crank to allow manual
handling.
Start motor of combustion air fan (with main gas cock still closed).
Purge combustion chamber.
Start combustion fan and move the burner control crank arm toward “HI” fire posi-
tion. So that air only will be flowing through burner and combustion chamber,
purging any explosive vapours that may have accumulated prior to initial start-up or
during a periodic shut-down. When it is certain that the system is completely free of
explosive vapours move the burner control crank arm toward “LO” fire position.
Length of purge time required will usually be specified by insurance or approval
agency having jurisdiction.
Bleed air from the fuel supply line.
After completion of purging remove the adjusting screw cover from the top of the
pilot gas pressure regulator (if applicable) and unscrew adjusting screw com-
pletely up to the top (counter clockwise).
Make sure that burner gas control valve is in “LO” position.
Open main gas cock and pilot gas cock together and press ignition push button.
The spark ignitor is energized (as can be seen through the observation port of the
burner), the pilot solenoid valve will open to allow gas flow to the burner.
While energizing spark ignitor, turn the pilot gas regulator screw in (clockwise) until
pilot gas is ignited. Flame should be blue and stable. It may take several seconds
before the air is bleeded from the fuel supply line and replaced by gas. The pilot gas
regulator should have an outlet pressure of 5-15 mbar.
In most of the cases, pilot ignition should take place automatically and stop after a
determined period of time. As soon as UV scanner detects pilot flame, the safety
circuit will open the pilot solenoid valve and energize the main safety valve which
will open to allow main gas flow to the main burner.
Remark: should you have questions regarding the operation of the control/safety
systems, please contact Maxon.
Adjustment of the main gas pressure regulator.
Adjust air/gas ratio; the precise adjustment of the main gas pressure regulator,
which controls the gas pressure supplied to the burner, will influence combustion
efficiency. Make sure that burner control crank is in “LO” fire position. Observe
flame presence through observation port at the rear of the burner. Open main gas
shut-off valve to ignite main burner. Remove top cover of main pressure regulator
and adjust burner inlet pressure as indicated in the selection table (page
2.600.2.1). To obtain correct burner operation we recommend to check burner
adjustments by analysing the combustion products. At max. burner capacity the
oxygen content in the fumes should be approx. 3%. Slowly move burner control
crank toward “HI” fire position. Adjust main gas pressure regulator to provide the
desired burner conditions. The required gas pressure under normal operating con-
ditions and the kW capacity are stamped on the burner nameplate. Replace the
regulator covers and proceed.
Reconnect automatic control linkage.
Reconnect linkage and run control motor to its extreme limits of travel. Check that
linkage does not bind and that burner firing rate control handle does not go beyond
the words “LO” or “HI”. The full range of firing rates from “LO” to “HI” should be used
if the rated maximum capacity (see nameplate) and turn-down is desired.
If interrupted pilot is used.
If pilot is to be interrupted after start-up so flame failure detection operates from