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PART 7
COMPONENTS
7.1
HOT SURFACE IGNITER (GLOW BAR)
The silicon carbide igniter is inserted directly through the
fan flange and held in place by two screws. A hold down
bracket as well as sealing gasket above and below the
igniter assures a good seal. Care must be taken when
removing and/or installing the igniter since the silicon
carbide element is brittle. Always remove the igniter prior to
removing the fan assembly for inspection of the burner and
heat exchanger. Properly prepared igniter will have a bead
of silicone sealing the end mounting bracket to the ceramic
shaft.
Figure 34: Hot Surface Igniter
During trial for ignition a properly operating igniter will
generate 3.2+/-0.2A which is the proof current required by
the ignition module for reliable and consistent operation. It
is recommended that the hot surface igniter be replaced
every 4,000 hours of appliance operation to maintain peak
ignition efficiency.
7.2
FLAME SENSOR
The flame sensor is inserted directly through the fan flange
and is screwed into the fan flange. Care must be taken,
when installing the flame sensor, to align it perpendicular to
the fan flange and parallel to the burner tube and not to
over tighten. Always remove the flame sensor prior to
removing the fan assembly for inspection of the burner and
heat exchanger.
Figure 35: Flame Sensor
The ignition module relies on the flame sensor to provide a
flame rectification signal. Oxide deposits, improper
placement or damaged ceramic insulator will result in
insufficient signal leading to ignition module lock out. For
proper operation minimum 2.0 µA DC must be fed back to
the module. Oxide deposit on the sensor rod must be
removed with steel-wool. Do not use sand-paper since this
will contaminate the surface.
7.3
COMBUSTION AIR FAN
Figure 36: Fan, Burner, Hot Surface Igniter and Flame
Sensor Arrangement
DynaFlame uses a sealed air fan to provide combustible
air/gas mix to the burner and push the products of
combustion through the heat exchanger and venting
system. The fan assembly consists of a sealed housing and
fan wheel constructed from spark resistant cast aluminum.
The fan is operated by a fully enclosed 230 VAC, 3 Phase
electric motor. The fan housing and motor assembly is fully
sealed and SHOULD NOT be field serviced. The power
draw of the motor is proportional to the modulated gas input
rate of the appliance.
7.4
INNER JACKET
The inner jacket assembly is constructed from a special
corrosion resistant stainless steel. This includes both the
primary heat exchanger chamber and the secondary heat
exchanger chamber. All screws and fasteners used for
assembly
of the inner jacket and secondary heat exchanger
chamber are also stainless steel.
DO NOT mix stainless steel and standard plated
fasteners when disassembling and reassembling the
inner jacket sheet metal components. Standard plated
fasteners will be damaged by the flue product
condensate when used on the inner jacket assemblies.
7.5
OUTER JACKET
The outer jacket assembly is constructed from mirror finish
stainless Steel. This ensures a long life for the jacket
assembly, with full integrity
7.6
VENTING TRANSITION
All appliances are shipped with a rectangular to round
stainless steel adapter. Depending on the appliance
category an increaser will be required for the proper vent
configuration. Please refer to Table 4 dimensions and
specifications.
When installing Category II or IV appliances care must be
taken to properly seal all joints and provide slope for
drainage of condensate.
42
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