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SERVICING INSTRUCTIONS — ELECTRICAL
OPERATION
SEE PAGE 11 FOR COMPONENT NAMES / NUMBERS
1. Pressing the POWER key energizes the unit. The
POWER LED will glow whenever the unit is ON.
2. Automatic fill is accomplished via a FILL SOLENOID
(32) and a WATER LEVEL PROBE (7). The probe
senses ground through the water in the tank. When the
water level falls below the probe and ground is no longer
sensed, the CONTROLLER (20) energizes the fill
solenoid until the water level again reaches the water
level probe.
3. Pressing the BREW key begins the brew cycle.
Pressing the CANCEL key at any time during the
brew cycle terminates the brew. The BREW SOLENOID
(18) is energized by the CONTROLLER (20) for a time
determined by the setting of the BREW TIME
CONTROL. A second brew can be started only after the
brew time plus the time set on the DRIP OUT TIMER
has elapsed.
4. Brew water temperature is controlled via a water
temperature sensor and a HEATING ELEMENT (15)
controlled by a TRIAC (17) electronic switch. The
element is energized according to the sensed water
temperature and the desired temperature setting of the
BREW TEMP control. An over-temperature condition
will trip the HI-LIMIT THERMOSTAT (4), de-energizing
the heating element.
5. Individual WARMER PLATES (27) are heated by
WARMER ELEMENTS (28), which are controlled by the
WARMER keys. Pressing a warmer key will turn ON or
OFF the corresponding warmer and LED.
Because coffee loses its freshness after sitting on a
warmer, a quality time function is included. The
WARMER LEDS will begin to flash some time after the
last brew cycle, based on the setting of the QUALITY
TIMER. Note: QUALITY TIMER does not turn off the
warmer elements.
6. The unit will revert to the energy-saver mode some
time after the last brew, based on setting of the AFTER
HOURS TIMER.
WARMER
CONTROLLER
WARMER
ELEMENT
QUALITY
TIMER
FILL
SOLENOID
WATER
LEVEL
PROBE
CONTROLLER
FILL
BREW
BREW
TIME
BREW
SOLENOID
DRIP OUT
TIME
BREW
CANCEL
CONTROLLER
BREW
WATER
TEMP
PROBE
BREW
TEMP
TRIAC
HEATING
ELEMENT
T
HI-LIMIT
STAT
LINE
VOLTAGE
CONTROLLER
WATER TEMPERATURE
WARMER
PLATES
10