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6-1
ELECTRIC COOKER MODELS 17EC, 17ECS, ESW AND EWBS
CHAPTER 6: 17EC/17ECS SERVICE PROCEDURES & PARTS
6.1 Functional Description
The 17EC Electric Cooker contains a 16.5-gallon (62.5-liter) stainless steel cookpot. The water in
the cookpot is heated by a pair of 8.5-kilowatt heating elements. Electrical power to the elements is
controlled by a solid-state SMS III Spaghetti Magic computer specifically modified for this
application. NOTE: The SMS III computer used in the 17EC is identical in appearance to the SMS
III computers used in other model lines, but differs internally. Use only P/N 106-0385 SMS III
computers on this equipment. The 17EC is equipped with a basket lift, and also features automatic
filling (AutoFill) and automatic skimming (AutoSkim). This model also has a swing-away jointed
faucet. The 17ECS model has an attached 16.5-gallon (84.1-liter) rinse tank.
Turn the Master Power Switch ON and press the computer Power switch. A logic circuit checks the
water level by looking for a ground at the upper water-level sensor. A normally closed solenoid
valve opens if no ground is seen, indicating water is below the sensor, and water enters the cookpot.
The unit enters the Simmer mode when the heating elements are covered (indicated by grounding of
the low-water sensor). The cookpot continues to fill until water reaches the upper water-level sensor
and the solenoid closes. The cooker stays in Simmer mode until the Boil mode switch is pressed or
the unit is turned off. The water solenoid valve opens anytime the water level is below the upper
water-level sensor.
Logic circuits in the computer monitor the temperature and cycle power on and off to maintain the
simmer setpoint. (See Chapter 3 for instructions on adjusting the setpoint.) The cooker also has a
high-limit safety. If the cookpot fails to refill and the water level drops below the low-water sensor,
the high-limit will open, cutting off power to the elements, when the element temperature reaches
400 ±15ºF.
Pressing the Skim switch activates the AutoSkim feature. A logic circuit in the computer opens the
solenoid valve in the water supply line for three seconds every minute until the option is turned off
by again pressing the Skim switch.
The operator enters a cooking time by pressing the number pads on the computer. The computer
counts down the cook cycle time when the Start switch is pressed. When the computer times out, an
alarm sounds briefly, then the timer reverts to the last time entered.
Logic circuits in the computer also activate the basket lift motors when the Start switch is pressed,
lowering the basket into the cookpot. A pair of motors drive the basket lift arms down until a cam
attached to the left motor loses contact with a roller-activated microswitch and power to the motors
is cut. When the computer times out, the logic circuits reverse the switch positions so that the motor
circuit is again completed and the motors are restarted, raising the basket from the cookpot. The
cam again makes contact with the microswitch at the raised position, cutting power to the motors
and stopping the lift in the up position.