Grindmaster 67710E Adjustments, Bypass Adjustment, Thermostat Adjustment, Service Personnel Only

Figure 4, Bypass Valve

Adjustments

!	WARNING, ELECTRIC SHOCK HAZARD
	INSTALLATION SHOULD BE PERFORMED BY QUALIFIED
	SERVICE PERSONNEL ONLY.

Bypass Adjustment

See figure 4.

Each liner has an independent bypass which is adjustable. The Bypass valve controls the ratio of water sprayed over the grounds to the water poured directly into the liner -bypassing the grounds.

The urn is shipped from the factory with the bypass open 3 1/2 turns. This means approximately 25% of the water

bypasses the coffee grounds. See the next section on Brew Techniques about the effect of bypass on coffee.

If you desire more of the water to go through the coffee grounds, close the valve. Open the valve to allow more water to bypass the coffee. Each liner’s valve must be adjusted separately. You may need to adjust the brew timer slightly if you adjust the bypass to maintain the correct volume.

Thermostat Adjustment

See figure 5.

The thermostat controls the temperature of the water in the tank by switching the heater contactor on and off. A capillary tube monitors temperature near the heaters. The thermostat is calibrated such that when the shaft is turned all the way on, the temperature is 200 degrees Fahrenheit.

To change the water tank temperature:

Adjustment Screw

•	Turn off power to the urn.
•	Remove the control enclosure access cover.
•	Locate the thermostat shaft inside the control
	enclosure.	Figure 5, Thermostat
•	Turn the shaft full on.

American Metal Ware 67710E Coffee Urn Page 12