Reznor MAPS III, Cabinet D RECB Users Manual - Manual (Page 24)

Form O-MAPSIII Cabinet D, P/N 222918R9, Page 24
Check the Ignitor and Flame Sensor
Flame Sensors
FIGURE 10 - Ignitor
showing required Spark
Gap Measurement
1/8 inch
(3.2mm)
Ignitor - Locate the ignitor. Disconnect the wire; remove the screw and the ignitor.
Clean the ignitor assembly with an emery cloth.
Spark gap must be maintained to 1/8". See
FIGURE 10.
Ignitor
4.1.3 Maintenance
Instructions for the
Venter Motor and
Wheel
If the venter assembly is not already removed, remove it by following STEPS 1-4 in
Paragraph 4.1.1 for accessing the heat exchanger ( NOTE: It is not necessary to open
the blower door.)
Note that during normal operation of the AG70 deep modulation control system, the
current draw of the venter motor can exceed the full load amp rating on its nameplate.
This condition is common when employing electronic wave-chopping technology to
reduce the running speed of a single-phase type PSC alternating current motor. The
technology reduces energy to the main winding by momentarily interrupting current for
a variable amount of time, resulting in a reduction of the motor speed. The increased
current is a result of increased slip, which is the difference between the rotation speeds
of the rotor and stator fields. All motors used in MAPS III systems are custom designed
and built for this unique modulating application and cannot be replaced with a non-
approved motor. All prototype motors have been thoroughly tested with regards to
temperature of the windings and bearings at all operating points and ambient condi-
tions and approved by the manufacturer to assure the elevated current does not affect
the normal motor life expectancy.
Remove dirt and grease from the venter housing, the motor casing, and the venter
wheel. Venter motor bearings are permanently lubricated.
If replacing venter parts, see
FIGURE 11 for proper spacing. If the motor plate gasket
is damaged or deteriorated, replace it with P/N 222856.
4.1 Heat Exchanger, Burner, & Venter Maintenance (cont'd)
IMPORTANT: When re-assembling, the brown ground wire must remain attached to
the ignitor.
Flame Sensor - Locate the flame sensor on the burner.
Disconnect the wires; remove the screws and the flame
sensor. Clean with an emery cloth.
CAUTION: Due to high
voltage on the spark
wire and electrode,
do not touch when
energized.
4.0 Gas Heat
Section
Maintenance
(cont'd)
4.1.2 Instructions for Inspecting/Cleaning the Burner (cont'd)
of the burner end caps. Remove the screws that hold the end caps to the burner
housing. Lightly tap end caps to remove.
Clean all foreign material from the burner and venturi. After the burner is
thoroughly cleaned, replace the end caps making certain that they are tight
against the burner housing. NOTE: If any of the burner components are damaged
or deteriorated, replace the burner assembly.
FIGURE 11 - Venter
Wheel Position on
Shaft
1/2” (13mm) from
motor plate to wheel
NOTE: Measure from
plate and not
the gasket.
Venter
Motor
Motor Plate
with Gasket
Venter Wheel
NOTE: Manufacturer recommends
replacing venter motor capacitor See
FIGURE 12.) when replacing venter motor.
Use only factory-authorized replacement
parts.