Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-31
F.
Burner Design – General
1.
The burner shall be integral to the windbox.
2.
All air for combustion shall be supplied by a forced draft blower
mounted in the windbox, above the burner, to minimize noise
and vibration level.
3.
The blower motor shall be an open drip proof type with a
minimum service factor of 1.15.
4.
The impeller shall be an enclosed centrifugal fan type, properly
balanced, and directly connected to the blower motor shaft.
5.
The combustion air damper shall be integral to the windbox
and shall be operated by a single damper motor.
6.
The burner shall remain in the low fire position during ignition
and until main flame has been established.
7.
A combustion air proving switch shall be provided to ensure
adequate air for pre-purge and combustion.
G. Burner Design – Gas
1.
The burner shall be the high radiant multi–port type
approved for operation with natural gas.
2.
The burner shall operate on the
(low–high–
low or full modulation) principle and must return to the low fire
position prior to ignition.
3.
Automatic electric ignition of the premix gas pilot shall be
furnished. An electric scanner, of the UV principle, shall
monitor the pilot, preventing the primary fuel valve from
opening until the pilot flame has been established.
4.
The single combustion air damper motor shall operate the gas
butterfly valve. The damper motor shall regulate the fire
according to system demand in response to the firing rate
control.
H. Burner Design – No. 2 Oil
1.
The burner shall be the pressure atomizing type approved for
operation with commercial grade No. 2 oil.
2.
The burner shall operate on the low–high–low principle, and
must return to the low fire position prior to ignition.
3.
The burner shall remain in the low fire position during ignition
and until main flame has been proven. The ignition period
shall be monitored with an electric scanner, of the UV principle,
to confirm the presence of the low fire oil flame.
4.
Automatic electric ignition of the low fire oil supply shall be
provided with a minimum 10,000 volt transformer and heavy
duty electrodes.
Notice
Optional insurance compliance may require a premix gas pilot in lieu of direct spark
ignition.
