Goldmedal Discovery 2556EX User manual

Part No. 69922EX
Instruction Manual
10700 Medallion Drive, Cincinnati, Ohio 45241-4807 USA
Discovery
Model No. 2556EX, 2557EX, 2563EX

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 2
gmpopcorn.com
SAFETY PRECAUTIONS
DANGER
Machine must be properly grounded to prevent electrical shock to personnel.
Failure to do so could result in serious injury, or death.
DO NOT immerse any part of this equipment in water.
DO NOT use excessive water when cleaning.
Keep cord and plug off the ground and away from moisture.
Always unplug the equipment before cleaning or servicing.
Make sure all machine switches are in the OFF position before plugging the
equipment into the receptacle.
008_051514
DANGER
Improper installation, adjustment, alteration, service, or maintenance can
cause property damage, injury, or death. Any alterations to this equipment will
void the warranty and may cause a dangerous condition. NEVER make
alterations to this equipment. Read the Installation, Operating, and
Maintenance Instructions thoroughly before installing, servicing, or operating
this equipment.
014_051514
WARNING
To avoid burns, DO NOT touch the kettle or any heated surface.
DO NOT place or leave objects in contact with heated surfaces.
013_092414
WARNING
ALWAYS wear safety glasses when servicing this equipment.
010_010914
WARNING
No user serviceable parts inside. Refer servicing to qualified service
personnel.
011_051514
WARNING
Read and understand operator’s manual and all other safety instructions
before using this equipment. To order copies of the operator’s manual go to
gmpopcorn.com or write to Gold Medal Products Co., 10700 Medallion Drive,
Cincinnati, OH 45241 USA 1-(800)-543-0862
022_010914

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 3
gmpopcorn.com
SAFETY PRECAUTIONS (continued)
WARNING
DO NOT allow direct contact of this equipment by the public when used in
food service locations. Only personnel trained and experienced in the
equipment operation may operate this equipment.
Carefully read all instructions before operation.
012_010914
WARNING
This machine is NOT to be operated by minors.
007_010914
Note:Improvements are always being made to Gold Medal’s equipment. This
information may not be the latest available for your purposes. It is critical that
you call Gold Medal’s Technical Service Department at 1-800-543-0862 for any
questions about your machine operations, replacement parts, or any service
questions. (Gold Medal Products Co. does not assume any liability for injury due
to careless handling and/or reckless operation of this equipment.)

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 4
gmpopcorn.com
INSTALLATION INSTRUCTIONS
Inspection of Shipment
After unpacking, check thoroughly for any damage which may have occurred in transit. Claims
should be filed immediately with the transportation company. The warranty does not cover
damage that occurs in transit, or damage caused by abuse, or consequential damage due to the
operation of this machine, since it is beyond our control (reference warranty in back of manual).
Manual
Read and understand the operator’s manual and all other safety instructions before using this
equipment. To order copies of the operator’s manual go to gmpopcorn.com or write to Gold
Medal Products Co., 10700 Medallion Drive, Cincinnati, OH 45241 USA 1-(800)-543-0862.
Model Description
The 32 oz. Discovery Popcorn Machine has the following capabilities according to the Model:
2556EX:Front Counter Unit, no automatic oil capability.
2557EX:Back Counter Unit, has automatic oil.
2563EX:Front Counter Unit, has automatic oil.

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 5
gmpopcorn.com
Setup
Your new Discovery Popcorn Machine is tested at the factory.
1. Remove all packing material and tape before starting operation.
2. Remove the Drop Panel located under the doors of the popper (it is held in place with
magnets); take out the Kettle, Old Maid Pan, and accessories from inside the base of
the machine.
3. Slide the Old Maid Pan into the opening provided in the base.
4. For shipping, the Corn Deck is packed on top of the popcorn machine. Remove all
packing material and assemble the Deck as shown in the steps below:
Accessories Included With Your Machine
•2 Tbs. Measure (29.6cc)
•32oz. Corn Cup
•Perforated Jet Scoop
•Flavacol Container
•Tube Brush
Step 1: Insert Corn Deck into the base of
the popper.
Step 2: Plug the Corn Deck element in to the
plug end provided.
Step 3: Lay the corn Deck down into
position.
Step 4: Reattach the Drop Panel; be sure it is
tucked under the Corn Deck.
Corn Deck
Old Maid Pan
Element
Plug

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 6
gmpopcorn.com
Electrical Requirements
The following power supply must be provided for your machine:
2556EX, 2557EX, 2563EX: 230V, 5760W, 50Hz
DANGER
Machine must be properly grounded to prevent electrical
shock to personnel. Failure to do so could result in serious
injury, or death.
Do NOT immerse any part of this equipment in water.
Do NOT use excessive water when cleaning.
Keep cord and plug off the ground and away from
moisture.
Always unplug the equipment before cleaning or servicing.
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 power for proper machine operation. We recommend
this popper be on a dedicated and protected circuit. Failure to wire properly will void the
warranty and may result in damage to the machine. It is Gold Medal Products Company’s
recommendation that this machine be plugged directly into a wall outlet. The use of extension
cords is not recommended due to safety concerns, and may cause sacrificed and/or reduced
performance.
Note: The Discovery “uses” both “hot to neutral” legs, 120v. The machine does not
“use” the 208v or 240v, “hot to hot” connection.
Before You Plug In Machine
1. Make sure all machine switches are in the OFF position before plugging the equipment
into the receptacle.
2. Make sure the wall outlet can accept the grounded plugs (where applicable) on the
power supply cord.
3. The wall outlet must have the proper polarity. If in doubt, have a competent
electrician inspect the outlet and correct if necessary.
4. DO NOT use a grounded to un-grounded receptacle adapter.
5. Install the unit in a level position.

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 7
gmpopcorn.com
Final Preparations
WARNING
To Avoid serious burns, do NOT touch the kettle while
it is hot!
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.

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 8
gmpopcorn.com
OPERATING INSTRUCTIONS
Controls and their Functions
LIGHT SWITCH
This switch operates 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
WARNING
To Avoid serious burns, do NOT touch the kettle while
it is hot!

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 9
gmpopcorn.com
Controls and their Functions (Continued)
Kettle Heat
Switch
Kettle Motor and
Exhaust Switch
“Red” Oil Dispense
Momentary Switch
(If Supplied)
Light Switch
Warmer
Switch
Oil System
Master Switch
(If Supplied)
Light & Audible
Signal (Load/Dump)
Pilot Light Green
(If Supplied)

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 10
gmpopcorn.com
POPPING CORN
Standard Popping Instructions
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. The proper amount of oil for the
32oz. Discovery is between 8oz. to 9.6oz.
3. Note: If the machine is supplied with an automatic oil delivery system, follow the
instructions provided in the oil pump manual to set the oil delivery amount.
4. 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.
5. 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.
6. When the popcorn has completed popping, the Light and Signal will turn on. Dump the
Popcorn.
7. 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!

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 11
gmpopcorn.com
Care and Cleaning
DANGER
Machine must be properly grounded to prevent electrical shock to personnel.
DO NOT immerse in water.
Always unplug the equipment before cleaning or servicing.
025_020314
Good sanitation practice demands that all food preparation equipment be cleaned regularly (only
use non-toxic, food grade cleaners). A clean looking, well-kept machine is one of the best ways of
advertising your product.
Note: It is extremely important to follow all of the cleaning procedures, otherwise
parts damage and equipment failure will result. The warranty does not
cover parts that are damaged due to improper cleaning.
Daily Kettle Cleaning Instructions
Under no circumstances should the kettle be removed from the machine for cleaning.
1. In between batches of popping corn, wipe the kettle with a clean, soft cloth. It is easy
to keep the outside of the kettle clean when it is warm and the oil is not baked on.
CAUTION: The hot kettle will cause burns if you touch it with your hand. Allow
kettle to cool at least 1 hour before attempting to clean.
WARNING
To avoid serious burns, DO NOT touch the kettle while it is hot!
028_020314
2. Every night, mix Gold Medal’s Heat’n Kleen solution (Item No. 2095), 2 tablespoons
per gallon of water. It is not necessary use the entire gallon at once; only use enough
to fill the kettle 1/2 inch deep.
3. Turn the kettle heat ON. When the water starts to boil, turn the kettle heat OFF.
4. Allow to cool for 30 minutes, then dump the solution into a bucket and wipe the inside
of the kettle with a clean cloth. Make sure all of the solution goes into the bucket; do
not spill any in the interior of the machine.
If the kettle is very dirty, this step may be repeated more than once or allow solution
to work overnight. The next morning, dump the solution into a bucket and wipe the
inside of the kettle with a clean cloth.
5. A Clean-In-Place Hook is located behind the operator side kettle support arm (see
image on next page). Tilt the kettle to the dump position, and swing the hook into
position to hold the kettle in the dumped position. This feature will safely hold the
kettle in place for cleaning, and allow access to hard to reach places, without removing
the kettle.

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 12
gmpopcorn.com
6. With the unit OFF and unplugged, wipe the kettle lead cord with a clean SLIGHTLY damp
cloth. DO NOT get moisture into the kettle lead-in cord, severe damage will result.
Daily Unit Cleaning Instructions
1. With the machine OFF, unplug the unit and allow it to cool before attempting to clean.
2. Make sure to clean all pans/accessories in order to sanitize them before each use.
3. Take a clean, SLIGHTLY damp cloth and wipe excess grease from the glass and cabinet.
4. Wipe the stainless steel parts with a clean cloth and cleaner designed for stainless
steel, such as Gold Medal Watchdog Stainless Cleaner (Item No. 2088).
DO NOT use oven cleaners or abrasive materials as they will damage parts of the machine.
5. Clean the glass panels with glass cleaner. Gold Medal Watchdog Glass Cleaner (Item
No. 2588) is recommended.
Ammonia cleaners will damage the plastic doors. Use only non-ammonia cleaners,
such as Gold Medal Watchdog Glass Cleaner (Item No. 2588).
Clean-In-Place Hook

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 13
gmpopcorn.com
Filter Cleaning
Your popcorn machine is equipped with an efficient and durable filtration system. The first mesh
filter should be cleaned on a daily basis, and the two internal filters should be cleaned weekly to
maintain maximum efficiency. Follow the steps below for proper filter cleaning:
Step 2: Weekly Filter Cleaning
Loosen the 2 screws on the filter
cover plate, on the ceiling inside
the popper. Remove the cover, the
Bag Filter, and the 2 Mesh Filters.
Step 3:
Clean the bag filter and the mesh
filters in warm soapy water, then
rinse. Let dry overnight and
reinstall.
CAUTION: Keeping the filters
clean is important to let the
exhaust system do its job.
Oil Mist Bag Filter
(2) Metal Mesh Filters
Loosen
2 Screws
Step 1: Daily Filter Cleaning
Remove the first Mesh Filter, and clean
it each day after use. This filter can be
removed without taking off the filter
cover. See Step 3 for instructions on
cleaning the Mesh Filter.
Clean first Mesh Filter daily.

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 14
gmpopcorn.com
TROUBLESHOOTING
Long popping Cycles
If your pop cycle is longer than 4 minutes, it can be the result of several things:
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.
LOW VOLTAGE -If the machine is operated on low voltage, this could cause the kettle not
to reach the proper operating temperature.
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.
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 Kettle shunt
trip breaker is not tripped. The shunt trip beaker may trip during transit, if the breaker is reset
then trips again; contact a service technician for inspection/repair before going any further.
KETTLE HEAT SWITCH -Check the voltage to and from the Kettle Heat switch, and if the
switch is defective replace it.
CONTROL - A defective thermocouple lead will cause the kettle not to heat. Check for
good connections from the kettle to the control.
KETTLE AGITATOR -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 supplied on your machine)
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, it may be necessary to replace it.

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 15
gmpopcorn.com
Replacing Broken Glass
If you accidentally break a panel of glass, it can be replaced very easily without disassembling the
popper. Gold Medal Products does not ship glass. Obtain from local glass shop and always
purchase double strength type glass.
1. Remove all loose pieces of glass.
2. Remove all rigid glass channels from around the glass to be replaced. Set it aside as it
must be reused.
3. Carefully remove the rest of broken glass.
4. Apply decals (if desired) to the new glass panel.
5. Slide rigid glass channels over the exposed sides and bottom. Front and side glass slide
under top and is then lowered into bottom channel.
Glass Dimensions:
Front Glass: 31 15/16” X 32 3/8” X 1/8”
Side Glass: 31 15/16” X 24 3/8” X 1/8”

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 16
gmpopcorn.com
MAINTENANCE INSTRUCTIONS
DANGER
Machine must be properly grounded to prevent electrical shock to personnel.
Failure to do so could result in serious injury, or death.
DO NOT immerse any part of this equipment in water.
DO NOT use excessive water when cleaning.
Keep cord and plug off the ground and away from moisture.
Always unplug the equipment before cleaning or servicing.
Make sure all machine switches are in the OFF position before plugging the
equipment into the receptacle.
008_051514
DANGER
Improper installation, adjustment, alteration, service, or maintenance can
cause property damage, injury, or death. Any alterations to this equipment will
void the warranty and may cause a dangerous condition. NEVER make
alterations to this equipment. Read the Installation, Operating, and
Maintenance Instructions thoroughly before installing, servicing, or operating
this equipment.
014_051514
WARNING
No user serviceable parts inside. Refer servicing to qualified service
personnel.
011_051514
CAUTION
THE FOLLOWING SECTIONS OF THIS MANUAL ARE INTENDED ONLY
FOR QUALIFIED SERVICE PERSONNEL WHO ARE FAMILIAR WITH
ELECTRICAL EQUIPMENT. THESE ARE NOT INTENDED FOR THE
OPERATOR.
027_010914

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 17
gmpopcorn.com
Electronic Temperature Control (Export)
Operation
The temperature control is factory set to stop the power to the kettle when the thermocouple
reaches setpoint. This is also the ideal point to dump the popped corn out of the kettle. On the
first start-up, this is 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 finished popping corn.
Adjustment of Electronic Control
This unit has an electronic kettle control with 2 thermocouples (TC), one for control and one for
limit. There are no mechanical thermostats in this kettle.
There are (4) factory adjustments on the control:
1. Control Setpoint Temperature – This is factory set, DO NOT adjust.
2. Signal to Dump – If you want the signal to dump to be a little sooner or later, you can
adjust the Kettle Dump potentiometer (see image below). Turn clockwise (CW) to signal
sooner, counterclockwise (CCW) to signal later.
3. The patented Overshoot circuit is tuned for the kettle, DO NOT adjust this potentiometer.
4. The Audible Signal to Dump has three options; full volume, half volume, no sound (yellow
light only). Adjustments are made by jumper positions (see image below). The unit is
shipped with full volume.
It does not matter which TC goes
to A or B; it
DOES
matter that the
yellow leads go to the positive
terminals.
Remove this
jumper for
no sound.
Remove this
jumper for
lower volume.
Control Setpoint Temperature
This is factory set
, DO NOT ADJUST.
Overshoot – This is factory set,
DO NOT ADJUST.
Kettle Dump - This is factory set
to signal when kettle is ready to
dump. Turn CW to signal sooner;
CCW to signal later. ONLY make
small adjustments if needed.
L2 Neutral Lead
Jumper Wire C for 230 VAC
L1 Hot Lead
Audible Signal to Dump

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 18
gmpopcorn.com
ORDERING SPARE PARTS
1. Identify the needed part by checking it against the photos, illustrations, and/or
parts list.
2. Use only approved replacement parts when servicing this unit.
3. When ordering, please include part number, part name, and quantity needed.
4. Please include your model number, serial number, and date of manufacture (located
on the machine nameplate/data plate) with your order.
5. Address all parts orders to:
Parts Department
Gold Medal Products Co.
10700 Medallion Drive
Cincinnati, Ohio 45241-4807
Or, place orders by phone or online:
Phone: [phone]
[phone]
Fax: [phone]
[phone]
E-mail: [e-mail]
Web Page: gmpopcorn.com

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 19
gmpopcorn.com
32 oz. Kettle Assembly – 2127XNH (No Oil), 2127EX (Oil Ready)
18
21
13, 14
20
15
19
1
2
3
7
6
5
Complete Agitator Assembly
(Includes Lids)
8
Plug used for
NO oil supplied.
Complete Agitator Assembly
16
Funnel & Tube if oil supplied.
17
4
Kettle Assembly 2127EX (Shown)
10, 11
9
12

Discovery Model No. 2556EX, 2557EX, 2563EX
Page 20
gmpopcorn.com
32 oz. Kettle Assembly – Parts List
2127XNH – used for Model 2556EX (no oil supplied).
2127EX – used for Models 2557EX, 2563EX (oil ready).
Item Part Description Qty.
Part Number
2127XNH
2127EX
1
CROSSBAR FASTENER, NO PINS
1
47976
47976
2
RH KETTLE BOTTOM ASSY (see next section
for parts breakdown)
1
62300EX
62300EX
3
KETTLE LEAD ASSEMBLY
1
55140
55140
4
DUMP HANDLE PLASTIC
1
41139
41139
5
THREADED BLOCK
2
47999
47999
6
1/4-20 X 5/8 PH FL HD M/S
4
67947
67947
7
CROSSBAR FASTENER
1
47977
47977
8
32 OZ LID AGITATOR ASSY (Complete
Assembly – includes itemized parts listed
below)
1
41775NH
41775
9
BEARING, CAM FOLLOWER
1
61225
61225
10
SPUR GEAR
1
41380
41380
11
SET SCREW #10-32 X 3/16
2
41742
41742
12
WOODRUFF KEY #3 1/8 X 1/2
1
41730
41730
13
SET COLLAR 1/2ID X 7/8OD
2
47326
47326
14
SET SCREW 1/4-20 X 3/16
2
47751
47751
15
OIL TUBE W/FUNNEL (Oil Ready)
1
47689
16
THREADED PLUG (for No Oil Supplied)
1
68071
17
FRONT KETTLE LID 32 OZ.
1
41935
41935
18
AGITATOR SHAFT WELD ASSY.
1
61221
61221
19
CROSSBAR ASSY
1
41776
41776
20
REAR LID 32 OZ.
1
41936
41936
21
THREADED PLUG
1
68071
68071