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Page 13 American Metal Ware 67710E Coffee Urn
To Change the Water Tank Temperature (cont)
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Timer Adjustment
See figure 6.
Two timers control the brew cycle including the air agitation.
When a start switch is pressed, the timer sends power to the
pump through the normally open contact. Also, the brew
light is turned on. These stay on for the set amount of time.
After the time is up, the air agitation turns on to stir the
coffee.
The time is set by turning an adjustment potentiometer,
see figure 6. This potentiometer is factory set to spray for 12 1/2 minutes.
To Adjust the Timer:
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Flow Rate Adjustment
See figure 7.
Two valves - one for each liner - control the flow rate of water
from the pump to the sprayover. They have been factory set to
provide proper rate for a twelve minute brew time. Only adjust
these if the rate has obviously come out of adjustment.
To Adjust the Rate:
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Figure 7, Flow Valve
Figure 6, Brew Timer
Spray Over Rate
Control
Timer
Adjust
Insert a miniature, flat screwdriver into the center of the shaft.
Turn the screw slightly to make adjustments: clockwise to increase the
temperature, counterclockwise to lower.
Turn the power back on and allow the temperature to equalize. The water
hot light turns on when the heaters are off.
Check the water temperature inside the tank. Repeat adjustment if needed.
Turn off power to the urn.
Remove the control enclosure access cover.
Locate the timer you need to adjust.
Find the marked adjustment potentiometer on the front of the timer.
Insert a screwdriver and turn the potentiometer to the approximate time you need.
Restart the brewer and measure the time of a brew - start button pressed to
sprayover stop.
Re-adjust the potentiometer to make fine corrections if needed.
Turn off all power to the urn.
Remove the control enclosure access cover.
Locate the valve to the liner you want to adjust.
Open the valve slightly for faster sprayover, close
for slower sprayover.
Turn the urn back on and wait for the water hot light to turn on.
Brew water into the liner for the standard 12 1/2 minutes. Adjust the
timer if it does not run the pump for the correct time.