Goldmedal 2556 User manual

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Part No. 69922
Revised May 2002
DISCOVERY
Instruction Manual
Model #2556
Cincinnati, OH 45241-4807 USA
www.gmpopcorn.com

DISCOVERY
MODEL 2556
2
Safety Precautions

DISCOVERY
MODEL 2556
3
INSTALLATION INSTRUCTIONS
Inspection of Shipment:
Unpack the shipping container and thoroughly inspect the machine for any damage that may have occurred
during transit. Notify the freight carrier immediately in order to file a damage claim.
Setup:
Your new Discovery Popcorn Machine is completely assembled and tested at the factory.
Remove all packing material and tape before starting operation.
Electrical Requirements:
Domestic models only: 120v/208v or 120v/240v 60 Hz.
A 30 amp – 4 wire wall receptacle is shipped with each machine. This receptacle will accept the attachment
plug on the popper and must be used. Your electrician must furnish sufficient current for proper operation of
your machine. We recommend this popper be on a dedicated and circuit
protected line. (note: The Discovery “uses” both “hot to neutral” legs, 120v. The machine does not “use” the
208v or 240v, “hot to hot” connection.
FINAL PREPARATIONS
The popcorn machine was adjusted, inspected, and tested before it left the factory.
After the machine has been installed, mount the kettle assembly in the hanger arms
and plug in the kettle lead-in cord. Tighten the ring on the kettle lead-in plug.
If supplied with automatic oil delivery system:
Connect the clear oil line from the pump to the aluminum line from the popper with
the supplied hose clamp. Connect the 6 pin connector from the popper to the
receptacle on the oil pump. Both Bucket pump (2114 or 2114EX) and Bag-in-a-Box
pump 2257H or 2257HX) have the same receptacle.
Follow the instructions provided in the oil pump manual to set the oil delivery amount.
The proper amount of oil for the 32oz. Discovery is between 8oz. to 9.6oz.
To check for proper amount of oil, and assure oil is liquid, dispense a “shot” into a
measuring cup.

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MODEL 2556
4
OPERATING INSTRUCTIONS
CONTROLS AND THEIR FUNCTIONS
LIGHT SWITCH
Operates on all the lights, interior and dome, on your popcorn machine.
WARMER SWITCH
Operates the warmer in the corn storage area, keeps popped corn warm.
KETTLE HEAT SWITCH
Operates the heating elements in the popping kettle.
KETTLE MOTOR AND EXHAUST SWITCH
Operates both the kettle agitator motor and the exhaust blower. The exhaust blower is only required
when popping corn.
OIL SYSTEM MASTER SWITCH (If supplied)
Sends power to the oil pump, either the Bucket Pump or Bag-in-a-Box models. The warmer/blower on
the oil pump is activated. The warmer/blower on the oil pump will keep coconut popping oil liquid if
the doors on the base are kept closed. It may be desirable to keep this switch on at night, if you have
problems keeping the coconut oil liquid. Coconut oil will congeal at temperatures below approximately
76º F [24º C].
“RED” OIL DISPENSE MOMENTARY SWITCH(If supplied)
When pushed, will dispense the predetermined amount of oil into the kettle.
SALT/SWEET SWITCH (If supplied)
Adjust the kettle temperature for salt or sugar based popcorn.
LIGHT & AUDIBLE SIGNAL (LOAD – DUMP)
Alerts the operator to:
1. Load the corn and oil or
2. Dump the popped corn from the kettle or
3. Turn off the kettle heat switch if they are done popping corn

DISCOVERY
MODEL 2556
5
POPPING CORN
1. Turn on all Switches.
2. When popping with coconut oil, be sure the oil is liquid. Dispense oil into a measuring cup first then
use that oil for the first popping cycle.
3. When the kettle is ready (about 5-8 minutes), the Light and Audible Signal turn on. Lift the kettle lid
and pour in 32 oz. of corn (use the supplied corn cup) and 8 teaspoons (21 cc) of Flavacol. Close lid.
4. Press the RED oil pump button (if supplied). The proper amount of oil is pumped into the kettle. The
Light and Signal will turn off.
5. When the popcorn has completed popping, the Light and Signal will turn on. Dump the Popcorn.
6. On the final kettle of corn, turn the “KETTLE HEAT” switch off, just as the lids are forced open by the
popping corn. This saves electricity, and helps eliminate smoke and odor after you have stopped
popping.
REMEMBER:
If the kettle heat switch is turned on and the Signal 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 done popping corn
When you are finished popping, make sure “KETTLE HEAT” and “KETTLE MOTOR” switches are turned
“OFF”.
NEVER LEAVE THE HEAT ON WHEN YOU ARE NOT POPPING.

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MODEL 2556
6
CLEANING INSTRUCTIONS
DAILY:
Clean the Kettle
1. As you pop corn, wipe the kettle with a clean cloth. It is easy to keep the outside clean when the kettle is
warm and the oil is not baked on.
CAUTION: The hot kettle will cause burns if you touch it with your hand.
2. Every night, mix a gallon of Heat’n Kleen solution (2 tablespoons per gallon of water). Turn on the kettle
heat. When the water starts to boil, turn off the heat and let it work overnight.
3. The next morning, dump the solution in a bucket and wipe the inside of the kettle with a cloth.
4. A CLEAN-IN-PLACE hook is located behind the operator side kettle support arm. Just tilt the kettle to
the dump position, and swing the hook into position to hold the kettle in the dumped position. This
feature will help you clean the kettle.
Clean the Popcorn Machine
1. Wipe the stainless steel parts with a clean cloth and cleaner designed for stainless steel. Do not use
oven cleaners, as they will damage parts of the machine.
2. Ammonia cleaners will damage the plastic doors. Use only non-ammonia cleaners.
WEEKLY:
Clean the filters in the popcorn machine
1. Loosen the screw on the filter cover plate on the ceiling inside the popper. Remove the cover and mesh
filters. Clean the mesh filters in warm soapy water. Let dry overnight and reinstall.
CAUTION: Keeping the filters clean is important to let the exhaust system “do its job”.
2. Check the condition of the clear oil lines and tighten or replace as required.
Item No. Part No. Description
1 41250 Metal mesh filter

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MODEL 2556
7
MAINTENANCE INSTRUCTIONS

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MODEL 2556
8
TROUBLESHOOTING
LONG POPPING CYCLES
If your pop cycle is longer than 4 minutes, it can be the result of several things:
A. HEATING ELEMENT - One of the heating elements in the kettle may be burned out. This would
result in the kettle never reaching the proper operating temperature.
B. LOW VOLTAGE - If the machine is operated on low voltage, this could cause the kettle not to reach
the proper operating temperature. Voltage for each leg, with kettle turned on, must be at least 110v.
C. INADEQUATE SUPPLY LINES - Inadequately sized electrical supply lines, in addition to being a fire
hazard, would also prevent the kettle from reaching the proper operating temperature. Check with a
qualified electrician.
D. INFERIOR CORN - Inferior quality corn would result in longer popping cycles. Use only top quality
hybrid popcorn from reputable suppliers. Even then, if you let your corn pick up moisture or dry out,
your popping cycles will be slow.
KETTLE DOES NOT HEAT
Before you go any further, make sure the kettle lead-in cord is plugged in and the circuit breakers are
not tripped. Make sure all electrical connections are tight.
A. KETTLE HEAT SWITCH - Check the voltage to and from the “KETTLE HEAT” switch, and if the
switch is defective replace it.
B. CONTROL - A defective thermocouple lead will cause the kettle not to heat. Check for good
connections from the kettle to the control.
C. MAIN RELAY
MOTOR WILL NOT TURN AGITATOR
WARNING! If the kettle agitator shaft is not rotating, Do Not Pop corn.
Adjust the clearance between the kettle bottom and the stir blade to 1/32” (use a dime). Loosen the set
screw in the collars above and below the crossbar and adjust the agitator shaft as necessary. Then re-
tighten the set screws in the collars.
OIL PUMP DOES NOT DELIVER OIL TO KETTLE
If the pump is operating but oil is not dispensed, the oil may be solid in the oil lines. If the pump is not
operating see the pump manual for instructions.

DISCOVERY
MODEL 2556
9
TROUBLESHOOTING
REPLACING BROKEN GLASS
Should you accidentally break a panel of glass, it can be replaced very easily without disassembling the
popper.
1. Remove all loose pieces of glass.
2. Unscrew the glass retaining strips.
3. Remove all rigid glass channels from around the glass to be replaced. Set it aside as it must be
reused.
4. Carefully remove the rest of broken glass.
5. Apply decals to the new glass panel.
6. Slide rigid glass channels over the exposed sides and bottom. Maneuver the new glass into
position.
7. Replace glass retaining strips using the same screws you removed earlier.
Glass Size: (Front) 31 1/16” X 32 3 /16 " X 1 /8 "
(Sides) 23 15 /16" x 33 3 /16" x 1 /8"

DISCOVERY
MODEL 2556
10
ELECTRONIC TEMPERATURE CONTROL
This section describes the Electronic Temperature Control on your 32oz. Discovery. The temperature of the
popcorn kettle is controlled by an Electronic Control. Mechanical high limit thermostats are still used as a
limit control. This model is also equipped with a pulsing buzzer and light that signal when the kettle heat
switch is on but the kettle is at or over the temperature set point.
Operation
The control is factory set to 412F – 415F which stops power to the kettle when the thermocouple reaches
412F – 415F. On the Discovery machine, this is also the ideal point to dump the popped corn out of the
kettle. On the first start-up this is also the ideal time to load the corn and oil. Therefore if the kettle heat
switch is turned on and the buzzer is sounding one of the following actions should be taken:
·Load the corn and oil or
·Dump the popped corn from the kettle or
·Turn off the kettle heat switch if you are done popping corn
Adjustment of Electronic Control
If you would like to have the buzzer sound sooner or later than the factory setting, adjust the temperature
setting as follows:
1. To sound the buzzer sooner, lower the temperature setting. A change of 3 to 6 seconds can be
achieved with a change in temperature of 5 to 10 degrees.
2. To sound the buzzer later, raise the temperature setting.
The Electronic Control is located under the dome facing the operator on the left side. A calibrated dial is
located on the control for this purpose.
Adjustment of Buzzer Sound Level
If you would like to adjust the buzzer volume, turn the baffle on the buzzer.
1. If the kettle does not heat and the buzzer sounds continuously, then one of the following has happened:
a. The kettle plug is not tightened completely to the receptacle
b. The thermocouple wire is loose or broken.
2. If the kettle heats but the popping cycle is very long, check for a defective high limit thermostat. (buzzer
operates normally)
3. If the kettle is popping normally but the buzzer does not sound, check for a defective buzzer.
4. Caution: If the kettle pops too quickly, and the buzzer does not sound, do not continue popping
corn. Check for a loose thermocouple in the kettle. It is also possible the thermocouple leads are
“switched” from the correct polarity. (See note 2 below)
Either situation will result in the control to “ask” for more heat and the kettle will operate on the high limit
thermostats.
Notes:
1. Do not adjust the (3) potentiometers on the electronic control. If adjusted, the performance will be erratic
and could result in an over temperature condition. The only adjustment is described on page 1.
2. Thermocouple wire consists of (2) different wires made of different materials that are color-coded have a
polarity. It is important that red (-) is connected to red (-), and yellow (+) is connected to yellow (+), at
the lead-in plug, the receptacle, and at the electronic control. Note that the red lead is magnetic if you
have trouble determining which is which. If switched, the control will not operate.

DISCOVERY
MODEL 2556
11
ORDER SPARE PARTS
1. Identify the worn or broken part by checking it with the illustrations and parts list.
2. When ordering parts, include part number, part name, and quantity required.
3. Include you model name and machine serial number (found on nameplate) with your order.
4. Address orders to:
Jarco Industries
order toll free 800-458-7578
or order online at www.concessionstands.com

DISCOVERY
MODEL 2556
12
HOW CHUTE DOOR WORKS
When filling bags of popcorn, take the chute door and turn it around so the front of the door is facing the
popcorn machine. Place the chute door back into the door guides.

DISCOVERY
MODEL 2556
13
CABINET PART LIST
Item No. Part No. Description
1 41351 Female Long Right
2 41352 Female Long Left
3 41349 Male Short Left
4 41350 Male Short Right
5 41190 Side Glass
6 68896 Door
7 82986 Bag Filler Chute
8 69914 Chute Door
9 40276 Old Maid Pan
10 32112 Lead In Cord
11 47026 Strain Relief
12 69801 Drop Panel With Chute (68895 Plastic Drop Panel)
13 41635 Front Glass
14 41013 Door Knob
15 50013 Magnet
16 41941 Hanger Arm Assembly
17 41833 Shock Absorber Pin
18 41618 Clean In Place Latch (Knob is 12319)
19 41380 Spur Gear
20 41432 Gear Block

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MODEL 2556
14
CABINET ASSEMBLY
14
5
3
13
6
8
7
9
15
12
11
10
1
4
2

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MODEL 2556
15
CABINET ASSEMBLY
18
16
19
20
17

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MODEL 2556
16
ELECTRICAL PARTS LIST
Item No. Part No. Description
1 41015 Exhaust Blower, 115 V
2 46081 Relay
3 48018 Exhaust Blower, 120 V
4 48664 Electronic Temperature Control
5 47047 Lamp Holder
6 48547 Lens (for Indicator Light)
7 48545 Bulb (for Indicator Light)
8 48547 Housing (for Indicator Light)
9 61154 Buzzer
10 42798 Switches
11 48301 Motor Capacitor
12 41449 Drive Motor
13 47364 Circuit Breaker
14 41516E Kettle Receptacle

DISCOVERY
MODEL 2556
17
ELECTRICAL ASSEMBLY
1 2
3
4
5

DISCOVERY
MODEL 2556
18
ELECTRICAL ASSEMBLY
Control Panel
Without
Automatic Oil
Delivery, With
Optional
Salt/Sweet
Control.
610 9
9
10
11
12
13
14
8
7

DISCOVERY
MODEL 2556
19
KETTLE PARTS LIST
Item No. Part No. Description
1 41775 Lid and Agitator Assembly
2 41867 Oil Tube With Funnel *
3 41742 Set Screw
4 47976 Crossbar Fastener
5 41776 Crossbar Assembly
6 47749 Warning Label, Moisture
7 41944 Front, Lid Assembly
8 48977 Bushing
9 12611 LH 5/16-18 Button Soc Head
10 41400 Needle Bearing
11 41730 Woodruff Key #3
12 41380 Spur Gear
13 47326 Set Collar (2 req)
14 47977 Crossbar Fastener
15 47154 Warning Label, Immerse
16 41936 Rear, Kettle Lid
17 41940 Agitator Weld Assembly
18 47751 Set Screw
19 41450 1/4-20 x 1/2" Countersink Screw
20 61108 Thermostat Plate (Not Shown)
21 41533 Kettle Welded Assembly
22 82231 Heat Element, 1800 W
23 41534 Heat Transfer Plate
24 41536 Heat Element, 1000 W
25 47090 Heat Element, 1050 W
26 41491 Element Clamp
27 82219 Thermostat (2)
28 46311 Hex Grip Nut
29 41434 Retaining Nut
30 47999 Threaded Block (2)
31 41139 Plastic Handle
32 41597 Kettle to Shell Gasket (Not Shown)
33 41528 Kettle Shell Assembly
34 40963 Junction Box Gasket
35 48290 Kettle Lead Assembly
36 41129 Terminal Block
37 40965 Junction Box Gasket
38 41296 Junction Box Cover
39 61084 Junction Box Assembly
* When Supplied with Oil Delivery System.