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15. CONVEYOR BELT SPEED CALIBRATION
The conveyor belt requires calibration to properly align the speed control knob on the Electric Control Box.
Calibration is done by timing the belt as it passes between two timing marks located on the conveyor frame.
This method will work regardless of belt travel direction. Follow the instructions below.
Idler Shaft
Belt Travel
(Standard)
Timing Marks
on Conveyor Frame
Conveyor Frame
5” (1620E), or 7” (1828E)
A. Remove the adjustment knob of the conveyor belt speed control (see page 10) using a small,
standard screwdriver to loosen the setscrew.
B. Locate the two timing marks as shown above. For the Dual Air VH-, VHVA1620E series, the marks
are 5 inches apart; for the Dual Air VH-, VHVA1828E the marks are 7 inches apart. IF the timing
marks are NOT present, use a black marking pen to mark the frame in the same manner.
C. These distances represent exactly ¼ of the distance of the cook chamber: ¼ x 20” cook chamber
(DualAir 1620E) = 5”; ¼ x 28” cook chamber (DualAir 1828E) = 7”.
D. With this 1:4 ratio, it is possible to calibrate the belt speed. For example:
1. For a cook time of 1 minute, the time required to pass between timing marks would be: 60
seconds / 4 = 15 seconds. If the belt passes from one mark to the next in 15 seconds, this is
exactly the same as a 1-minute cook time.
2. For a cook time of 6 minutes, the required time to pass between timing marks would be: 6
minutes x 60 seconds / 4. This equals 360 seconds / 4 = 90 seconds between marks. The
belt needs to take 90 seconds (1-1/2 minutes) to move from one mark to the next to equal a
6-minute cook time.
E. Using a black marking pen, mark any belt link near the outer edge. Using a stopwatch, check the
time it takes for this link to move between the timing marks. Repeat this procedure several times
until the distance is traveled in 90 seconds (recommended calibration interval), which equals a 6-
minute cook time.
F. Now that the belt is moving at this calibrated speed, CAREFULLY re-mount the adjustment knob
onto the belt conveyor speed control shaft, and tighten the setscrew so that the KNOB indicating
mark is pointing at the number “6” on the surrounding label.
G. The conveyor belt is now calibrated for ALLranges as indicated on the label. The label numbers are
COOK TIME in MINUTES. Simply point the knob indicating line to the desired cook time.
The label COOK TIME marks are close approximates, and may vary slightly from actual
timing results using the method described.
H Cook/Bake Time is not the same as time of delivery. is the actual time required
for the first item, leading edge to trailing edge. is leading edge to leading
edge. For example, the for a 16” pizza with a 6 minute (using the
DualAir 1828 conveyor) is 9.4 minutes.
NOTE:
Time of Delivery
Cook/Bake Time
Time of Delivery Bake/Cook Time