Appendix A
Service Bulletin 0074
– NCC Electronic Temperature Control
http://www.gmpopcorn.com
Page 35
GOLD
MEDAL
PRODUCTS
COMPANY
10700 Medallion Drive
Phone:
(513) 769-7676
Cincinnati, Ohio 45241-4807
Fax:
(513) 769-8811
U.S.A.
SERVICE BULLETIN 0074
Date Issued – 8/23/04
REVISED 1/28/14
Model(s) Affected- All Poppers with NCC Electronic Temperature Control
This bulletin describes popcorn machines equipped with an Electronic Temperature Control manufactured by
NCC for Gold Medal Products. There are no mechanical thermostats used with this control. The mechanical
thermostats are replaced by two Thermocouple Sensors, one for the High Limit and one for Temperature
Control. This model is also equipped with a beeper and an indicator light that activate when the kettle heat
switch is on and the kettle is at or over the dump temperature set point.
Note: All components listed in this service bulletin are shown in Figure 1 on page 5).
Operation
The control is factory set to a temperature which stops power to the kettle when the thermocouple in the
kettle reaches the set temperature. See Table 1 for a list of temperature jumper settings. There is a Kettle
Dump Potentiometer that is used to set the Alarm point for loading and dumping the kettle. This
potentiometer will subtract up 10% of the set point jumper value to fine tune the alarm point. If the kettle
heat switch is turned on and the beeper is sounding one of the following actions should be taken:
1.
Load the corn and oil or
2.
Dump the popped corn from the kettle or
3.
Turn off the kettle heat switch if you are finished popping corn.
The High Limit Control is fixed at 550ºF and cannot be adjusted.
Overshoot Potentiometer
For a
stainless steel kettle
the Patented First Time Overshoot Circuit Potentiometer is set to -20%, full
clockwise (CW). DO NOT change this setting. This setting prevents the
kettle from getting too hot during the
first time heat up.
When power is applied to the kettle and the kettle temperature is below the first time overshoot
temperature set point the power to the kettle will be turned off at the overshoot temperature. The alarm
will NOT sound. The kettle will then cool to a point below the first time overshoot value and start to
reheat. When the kettle reaches the alarm temperature the alarm will sound and it is time to load the
kettle with corn and oil. The kettle will now operate from the alarm and
jumper set points. The first time overshoot set point is based on the power set point jumper setting. For
example if the power set point jumper is set at 460ºF the first time overshoot set point will be 368ºF
(460ºF-92ºF). The 92ºF is 20% of the 460ºF value.
