How The Power Supply System Works; How The Water Heating System Works; Technician Troubleshooting Guides - Frymaster Pasta Magic Service Manual

1.4.1 How the Power-Supply System Works
Line voltage is supplied to the system via a power cord that is plugged or hard-wired into the store's
electrical service. The power cord is connected to pins 1 and 5 of the high voltage 8-pin terminal
block. Line voltage is supplied to a 24VAC transformer from pins 4 and 8 of the high voltage ter-
minal block. Pin 6 on the relay behind the control panel supplies 24VAC to a heat relay, which con-
trols line voltage to the blower motor and 24VAC to the gas valve via the ignition module. The
transformer supplies 24VAC to the power switch and to the coils of the 24VAC relays.

1.4.2 How the Water Heating System Works

The power switch provides the interface between the operator and the system components. The
power switch switches 24VAC supplied through pins 5 and 6 on the switch. Internal circuitry senses
the water level and water temperature. The boil/simmer switch switches power through the thermo-
stat in simmer mode, which controls water temperature or in boil mode which bypasses the thermo-
stat and sends voltage to the 24VAC relay which controls burner firing.
To prevent lighting the burners when there is no water in the cookpot, these units are equipped with
a low-water float switch. This switch must close when the water in the cookpot rises to a safe level,
before the control circuitry will allow firing of the burners. Starch or lime build-up on the low-
water-level float switch may keep the switch from closing, therefore always make sure the sensor is
clean and its lead is firmly connected to the relay. NOTE: Do not use deliming solution to clean
these units. Use of deliming solution will damage all stainless steel parts.)
In addition to the low-water-float sensor discussed above, the water heating system has two more
parts: the electronic ignition system, the thermostat.
The electronic ignition system controls firing of the burners. See Page 1-2 for a complete
description of this system.
The thermostat is used only when the unit is in the simmer mode. When the simmer mode is
selected, the thermostat monitors the temperature of the water. When the water temperature drops
below the thermostat simmer setpoint, the thermostat closes the heat relay, causing the burners to
fire. When the water temperature reaches the setpoint, the thermostat opens the heat relay,
extinguishing the burners. This process repeats as required to maintain the temperature at the
setpoint programmed on the thermostat.

1.4.3 Technician Troubleshooting Guides

PROBLEM
Cooker does not turn
on.
(Green light is not
illuminated.)
PROBABLE CAUSES
A. Cooker power cord not plugged in.
B. Main circuit breaker tripped.
C. Failed transformer.
Test: Check for 24VAC on trans-
former secondary.
D. Failed power switch.
CORRECTIVE ACTION
A. Plug power cord into appropriate
outlet.
B. Reset main circuit breaker.
C. If voltage is incorrect, replace
transformer.
D. Replace power switch.
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