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SERVICING INSTRUCTIONS - ELECTRICAL
FUNCTION
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 (32) 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 BREW TIME setting.
A second brew can be started only after the brew time
plus the DRIP OUT time has elapsed.
4. Brew water temperature is controlled via a WATER
TEMPERATURE SENSOR (3) and a HEATING
ELEMENT (15) controlled by a TRIAC (17) electronic
switch. The element is energized according to the
sensed water temperature and the BREW TEMP setting.
An over-temperature condition will trip the HI-LIMIT
THERMOSTAT (4), de-energizing the heating element.
Note: On 120 volt units, hi-limit will automatically reset
once the tank has cooled by approximately 30ºF. On
240 volt units and dual voltage units, the hi-limit must be
manually reset by pressing the red button after the unit
cools.
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.
MAIN WARMER PLATE is turned ON automatically at
the start of a brew cycle.
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 QUALITY TIME setting.
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 AFTER HOURS TIME
setting.
WARNING:
RISK OF INJURY
The following servicing sections
are for operator reference only.
All servicing and/or repairs must
be performed by a qualified
technician
Reset Hi-Limit Thermostat
240 V & Dual Voltage Units
WARMER
WARMER
ELEMENT
FILL
SOLENOID
WATER
LEVEL
PROBE
CONTROLLER
FILL
WARMER
BREW
BREW
SOLENOID
BREW
CANCEL
CONTROLLER
BREW
BREW
TIME
DRIP OUT
TIME
WATER
TEMP
PROBE
TRIAC
HEATING
ELEMENT
T
HI-LIMIT
STAT
LINE
VOLTAGE
CONTROLLER
HEAT
BREW
TEMP
CONTROLLER
QUALITY
TIME
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