OPERATION (continued) |
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| WATER HEATER | |
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| Water temperature is sensed by a thermobulb | |
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| inserted into the water tank. This temperature signal | |
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| is fed to the mechanical thermostat. | |
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| The setpoint temperature is adjustable. Heating | |
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| element is energized by the thermostat. | |
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| Excessive temperature will trip the | |
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| switch. The | |
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| brewer cools. | |
Fig. 4 | Heat Control Diagram | WATER FLOW | |
AUTOMATIC OPERATION | |||
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| In COFFEE mode, pressing the BREW switch | |
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| causes the timer to energize the coffee brew | |
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| solenoid valve. This allows water from an external | |
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| water supply to flow into the water tank. | |
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| In TEA mode, pressing the BREW switch causes | |
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| the timer to energize the tea brew solenoid valve. | |
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| This allows water from an external water supply to | |
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| flow into the water tank. Additionally, the tea bypass | |
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| solenoid is energized, sending cold dilution water | |
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| from an external source to the dispenser. | |
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| Water flowing into the tank forces a like amount of | |
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| heated water out of the tank to perform the brew. | |
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| If an external water source is unavailable, one | |
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| decanter of cold water may be poured into the | |
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| recommended for brewing tea. | |
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| AUTOMATIC OPERATION TIMER | |
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| The length of time a brew or bypass solenoid is open | |
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| is controlled by the timer. The timer signal is routed | |
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| to either the coffee brew solenoid, or to the tea brew | |
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| and bypass solenoids, according to the position of | |
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| the mode switch. | |
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| HOT WATER FAUCET | |
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| The faucet water coil is submerged in the hot water | |
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| tank and draws heat from the brew water. Water | |
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| going to the water coil is not controlled by either | |
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| brew solenoid valve. | |
Fig. 5 Water Flow Diagram | Hot water is provided at the faucet, at supply water | ||
pressure, any time the faucet | |||
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| 8 |
M628 76201 Owners Manual 8781A Tea Brewer