Camus Hydronics DynaMax DMH081, Installation, Operation And Service Manual

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PART 7 COMPONENTS
7.1 DIRECT SPARK IGNITER
The direct spark igniter is inserted directly through the
combustion chamber front door and held in place by two
torx-20 screws. Care must be taken when removing and/or
installing the igniter. Always remove the igniter prior to
removing the fan assembly for inspection of the burner and
heat exchanger.
Figure 27: Direct Spark Igniter
During a trial for ignition sequence a properly operating
igniter will generate a continuous spark with a 9/64” (3.6mm)
spark gap. It is recommended to clean the direct spark
igniter using steel wool as required. DO NOT use sandpaper
or grit-cloth since this will contaminate the metal surface.
7.2
FLAME SENSOR
The flame sensor is inserted directly through the combustion
chamber front door and is screwed into the combustion
chamber front door by torx-20 screws. 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.
Figure 28: 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 0.8Vdc must be fed back to the
module. Oxide deposit on the sensor rod must be removed
with steel-wool. DO NOT use sand-paper or grit-cloth since
this will contaminate the metal surface.
7.3 COMBUSTION AIR FAN
DynaMax HS uses a modulating 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 120 VAC, Single-
Phase EC/DC 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 GAS VALVE
Figure 29: DynaMax HS 80 -250/260 Gas Valve
Figure 30: DynaMax HS 299 -399 Gas Valve
The gas valve supplied with the DynaMax HS boiler is a
combined valve/venturi assembly. A servo pressure
regulator is incorporated into the gas valve to provide stable
gas supply. Pressure taps are provided to check inlet and
outlet gas pressures. An internal fine mesh screen is
incorporated in the inlet of the gas valve to prevent debris
from entering the combustion chamber. Gas valves are
factory set at low and high fire and modulates to maintain
combustion characteristics across the full operating range.
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
Inlet gas
pressure
Inlet gas
pressure