Adjusting Main Burner - Maytag 111990" Automatic Dryers Service Manual

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Dynamic losses result from air turbu-
lence which occur when the air flow
changes direction or when there is a
change in the cross-section area of the
duct.
1. A change of cross-sectional area i5
illustrated in the above drawing.
The reducer deceases the cross-
sectional area which increases the
velocity and results in dynamic
pressure loss. The amount of fric-
tion through a reducer varies
directly with the square of the
velocity of air. This simply means
that the resistance through a
reducer is very high as compared to
a straight run of duct.
Proper operation and efficient
drying is dependent upon proper air
flow. The dryer is designed for use
of a 4" duct and reductions in the
duct are not recommended.
2.. Dynamics
\
Between 2 and 3 in the drawing, a
reducer has been added to the duct.
ED/GD401 1090
The reducer opposes the air flow·
and sets up air turbulence which
results in a pressure loss.
There are many factors influencing
air flow such as the considerations
listed under Guide for Proper
Exhausting. In addition to these
items, the operator's practices also
affect air flow, efficiency and the
resulting drying times.
A. Failure to clean the lint filter
regularly will result in a reduction in
air flow and will cause the dryer to
take longer to dry the clothes.
B.
Overloading restricts proper air
flow through the drum which will
also decrease efficiency and extend
the dry time.
ADJUSTING MAIN BURNER
To adjust main burner flame, loosen
screw holding air shutter and rotate
shutter until a yellow flame appears.
Then reverse the rotation of the shutter
until the yellow disappears and the
burner has a steady blue flame. To
achieve this, it may be necessary to
adjust the flame until only a very small
yellow flame is at the tip of the blue
flame. After a period of about five
minutes, all of the yellow should disap-
pear. If not, readjust the shutter
slightly. When the desired results are
achieved, tighten the screw to lock the
shutter in place.
SECTION 4. PRE-INSTALLATION CONSIDERATiONS
4-6