OPERATION (continued)

WATER HEATER

Water temperature is sensed by a thermobulb inserted into the water tank. This temperature signal is fed to the mechanical thermostat.

The temperature setpoint is adjustable. Heating element is energized by the thermostat.

Excessive temperature will trip the hi-limit safety switch. The hi-limit will automatically reset when the brewer cools.

WATER FLOW

AUTOMATIC OPERATION

Fig. 5 Heat Control Diagram

 

 

Pressing the BREW switch starts the timer, which in turn energizes the solenoid valves. This allows water from an external water supply to flow into the water tank. The incoming water forces heated water out of the tank to perform the brew. Additionally, a measured amount of unheated water is bypassed into the dispenser to dilute and cool the brew.

The solenoid uses a flow control device so that flow is consistent between 20 p.s.i. and 90 p.s.i.

The length of time the solenoid is open is controlled by the timer setting.

Fig. 6 Water Flow Diagram

608 p/n 76467 8740 Tea Brewer Owners Manual

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Bloomfield 8740 owner manual Water Heater, Automatic Operation

8740 specifications

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