Specifications

Gas burners - INDITHERM
MAXON UNITED STATES - MAXON EUROPE - MAXON ASIA - WWW.MAXONCORP.COM
E 2.160.8
3/05
All data shown on this page are subject to change without notice.
Specifications
BACK PRESSURE: static pressure within combustion affects maximum burner
capacity.
PILOTING: is accomplished by internally bypassing the built-in gas butterfly valve
(which is in the closed position at “LO” fire). The pilot gas is admitted to the gas nozzle
via the main gas conduit and is issued from the same gas nozzle ports as the main gas.
The pilot is the adjustment means for minimum burner capacity. An interrupted pilot
offers no safety advantage but it may result in an increased minimum, as the linkage
must be set above “LO” to secure adequate main gas flow for the minimum.
LOW FIRE START is essential for burners with a nominal capacity higher than 350 kW.
Direct burner start is allowed (without pilot burner) for all capacities below 350 kW.
To secure burner turndown characteristics, low fire (“LO”) position must be as low as
possible (adjust “LO” position).
GAS PRESSURE ADJUSTMENT: outlet of the gas pressure regulator equals:
 static pressure (or depressure) within combustion chamber
 gas pressure at burner inlet (see selection table - page 2.160.2.1)
 pressure drop over butterfly valve (5 mbar for natural gas, 2 mbar for propane)
 pressure drop over safety valves
GAS PIPE-TRAIN: the safety valves should be selected to resist the gas pressure
regulator. Their total pressure drop should be not more than 10 mbar (4 mbar if
propane). Capacity of gas pressure regulator can be approx. 130% of burner
requirements.
PROPANE AND BUTANE: all INDITHERM burners are suitable for operation on
propane and butane. Specify when placing order.
TOWN GAS : INDITHERM can be used with town gas having a high hydrogen content,
however this requires a modification. Specify when placing order.
FLAME LENGTHS shown are approximate.
COMBUSTION AIR PRESSURE SWITCH: a differential connection of switch,
blower-to-combustion chamber is recommended. The combustion air pressure switch
should be selected to have a set point ranging from 2 to 10 mbar for a static pressure of
0 mbar within the combustion chamber (equivalent to a differential connection).
Setpoint to be 2.5 mbar lower than min. pressure measured (at high fire).
MEASURING STATIC PRESSURE IN COMBUSTION CHAMBER: if there is no direct
pressure test connection with the combustion chamber, proceed as follows:
Connect one end of manometer with the gas pressure test connection - the other end
being in the ambient air.
Start combustion air ventilation.
Gas is closed and burner is in low fire position (“LO”); read pressure (positive or
negative) indicated on manometer.
To adjust air/gas ratio, pressure indicated on manometer is to be added to the value
indicated in the burner capacity table.
Example:
1. Static pressure in combustion
chamber:+1.5 mbar
Gas pressure indicated in
catalogue:+10 mbar (diff.)
Required gas pressure at test connection: