Bunn U3/SRU service manual Plumbing Requirements, Initial Setup U3

PLUMBING REQUIREMENTS

These brewers must be connected to a cold water system with operating pressure between 20 (138) and 90 psi (620 kPa) from a 1/2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water inlet fitting is 3/8" flare.

NOTE - Bunn-O-Matic recommends 3/8" copper tubing for installations from the 1/2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the countertop. Bunn-O-Matic does not recom- mend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.

This equipment must be installed to comply with the International Plumbing Code of the International Code Council and the Food Code Manual of the Food and Drug Administration (FDA). For models installed outside the U.S.A., you must comply with the applicable

Plumbing/Sanitation Code for your area.

INITIAL SETUP - U3

CAUTION - The brewer must be disconnected from the power source throughout the initial setup, except when specified in the instructions.

IMPORTANT: Brewer must be level and installed on a sturdy structure.

Electrician's and Plumber's Instructions are provided. These instructions should be carefully followed before proceeding with initial setup.

Be sure all electrical and plumbing connections are tight.

1.Open manual fill valve located on the bottom of the brewer. Water should start filling the tank. When water is visible in the hot water gauge glass (center spigot), close valve. Approximate time for filling manually is 3 minutes.

CAUTION: Never leave brewer unattended while manually filling tank.

2. Connect the brewer to the power source. Turn "ON/OFF" switch to the "ON" position. Water should finish filling tank automatically.

NOTE: It is recommended that the "ON/OFF" switch be left in the "OFF" position at the end of the operating day or when unattended for a long period of time.

3.Disconnect the brewer from the power source. Remove front cupola cover for access to thermostat knob and timer. On some brewers the thermostat knob is located on the front of the cupola cover.

4.Turn the thermostat knob clockwise to an approximate 5 o'clock position. Allow 1-1/2 hours for water to heat. Time will vary with incoming water temperature.

5.On initial warm-up, some water may flow thru the overflow spigot due to expansion of the cold water in the tank. This will not recur during the use of the brewer and may be avoided on the initial warm-up by drawing off 1/2 gallon decanters of water each 15 minutes till brewing temperature is reached.

6.Brewing cycles may be started whenever water temperature is correct. This condition is indicated by the dial thermometer on front of the brewer. Whenever the pointer is in the green, brewer is ready for brewing. The recommended brewing temperature is approximately 200° F (93°C). Water temperature may be increased by turning thermostat knob clockwise, decreased by turning knob counterclockwise.

7.When desired temperature is reached, insert funnel support, funnel and funnel cover in position. Be sure the water swing spout is over the center of the funnel cover, turn "ON/OFF" switch to the "ON" position, push and release "START" and run a brew cycle of hot water only. At the end of this cycle, brewer will be ready for checking timer adjustment.

8.The timer has been preset for a 4 minute cycle. This setting will deliver approximately 3 gallons of water per brewing cycle. To increase or decrease amount of water, adjust the timer as required. See Adjusting Brew

Volumes.

9.Having determined final settings of the thermostat and the timer, replace front cupola cover. Brewer is now ready for brewing coffee.

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