Grindmaster FDD2500-1-M-B User Manual

Grindmaster Model FDD2500

Service Manual

for

Model FDD2500

Warning Labels.................................... 12

Installation ..........................................

13

Programming ......................................

14

Start-up & Adjustments ......................

17

Cleaning ..............................................

18

Shipping Preparation........................

110

Replacing Controller ............................11

Replacing Components ........................11

Product Out Adjustment......................11

Troubleshooting Guide ........................12

Assembly Drawings ..............................14

Wiring Diagrams.................................. 28

Table of Contents

Prior authorization must be obtained from Grindmaster
Corporation for all warranty claims.

© Grindmaster Corporation, 2005 0307 Form # AM-342-04
PRINTED IN USA Part #63361

Grindmaster Corporation

4003 Collins Lane

Louisville, KY 40245 USA

[phone]

[phone] (USA & Canada only)

FAX: [phone]

www.grindmaster.com

Model FDD2500-1-M-B
Model FDD2500-3-M-B
Model FDD2500-1-3A-B
Model FDD2500-3-3A-B

Page 2 Model FDD2500

Warning Labels

The following warning labels were on your dispenser when it was shipped from the factory. They should remain on your dispenser
in good, readable condition at all times. If one of your labels is missing or damaged, order a replacement label immediately.

Part #71582

Located on machine cover and spout mounting bracket.

Part #63370

For FDD2500- -M-B models only
Located on front splash panel

Part #63371

Located next to center spout

Part #62981

Located on front splash panel

Part #63448

Located on tank drain hose

ADVERTENCIA

Contenidos pueden causar
quemaduras severas si el
uso es inadecuado.

AVERTISSEMENT

Contenu peut provoquer
des brûlures grâves si il est
manipulé incorrectement.

WARNING

Contents can cause
severe burns if
handled improperly.

PN# 62981

*

Model FDD2500 Page 3

Installation

WATER INLET CONNECTION

The National Sanitation Foundation requires the following for an NSF approved water hook-up:

1. A quick disconnect water connection or enough coiled tubing so that the machine can be moved for cleaning
underneath.

2. An approved backflow prevention device, such as a double check valve to be installed between the machine and
water supply. On units plumbed to permanent water line, installation of a water filter/softener system is recommended
to prevent lime and scale build up in the machine. On units pumping from remote water container, filtered water
is recommended to prevent lime and scale buildup in the machine.

3. Water pipe connections and fixtures directly connected to potable water supply shall be sized, installed and maintained
in accordance with Federal, State, and Local codes.

WATER HOOK-UP

1. Install the 4" legs and hand tighten. Install the plastic drain tray onto the
drain tray bracket and install drain grid. (Note: The drain tray is provided with
a drill-out port to allow for plumbing to a drain.)

2. Remove front splash panel for access to water hook-up. (see Figure 1)

3. Ensure the 3/8" water supply hose has sufficient length to allow the machine
to be moved for cleaning or service. Supplying hot water to the machine will
greatly increase the capacity of the machine. The use of copper tubing is
required to prevent rupture when using a hot water supply. A maximum inlet
water temperature of 160°F (71°C) is recommended.

4. Flush the water line to purge any debris from the supply line.

5. Connect a 3/8" water line to the 3/8" male flare connection.

6. Ensure water supply to machine is within 20 to 100psi. Install a pressure
regulator if pressure is too high.

7. Turn on water supply and check for leaks.

WARNING: ELECTRIC SHOCK HAZARD

Only qualified service personnel should perform installation of this appliance.
Improper installation could result in serious injury or death.

WARNING: ELECTRIC SHOCK HAZARD

Always disconnect power to the machine before servicing or cleaning. Risk
of electric shock is present which can cause serious injury or death.

WARNING: ELECTRIC SHOCK HAZARD

Never use the ground conductor as a neutral conductor. Serious injury or
death could occur in the event of a fault condition.

Figure 1







Page 4 Model FDD2500

Installation (cont.)

ELECTRICAL HOOK-UP

Ensure water connection is made to machine before proceeding.

The electrical ratings for your dispenser are located on the serial plate on the outside cabinet and inside door.
For configuration of three heater models to optional wattages, refer to page 31 of service manual.

1. For cord connected models, plug the power cord into an appropriate grounded
and dedicated electrical outlet. Go to step 8.

2. For hard-wired models not supplied with an electrical cord, the dispenser
should be connected to a dedicated circuit with a fused disconnect switch or
a circuit breaker near the dispenser.

3. Strain relief is supplied under the machine chassis for power entry.
(see Figure 2)

• Electrical connections and wiring materials must conform to local

codes and/or be in compliance with the National Electric Code

• Use only copper conductors

4. Note: Wiring diagram is on inside of left side panel.

5. Connect the power supply conductors, neutral (optional) and ground wire to
the appropriate positions on the terminal block. The ground lug is separate
from the terminal block. Note: machine is equipped with a stepdown
transformer to provide the necessary 120 volt power supply for the control
circuits. Neutral will not be used.

6. Remove lid and left side panel. (see Figure 3)

7. Install the front splash panel.

8. Install the plastic drain tray into the drain tray rails then place drain grid onto
drain tray.

9. Flip power supply to machine “ON” at the branch supply disconnect.

10. Flip power switch to the “ON” position and allow the water tank to fill. The
machine will make a subtle hissing sound while filling. Allow 3-4 minutes for
fill time depending on water pressure.

Attention: This machine employs an interlock switch to disable
the dispense and fill circuits when the front door is open. Ensure
the front door is closed while installing or operating the machine.
A watchdog circuit also monitors the water level in the tank and
will disable the machine if the water level in the tank is not normal
within (5) minutes of fill time. The machine will require power to
be reset to clear the watchdog timeout.

11. After the water tank has completed the fill cycle, the display will read “Water Heating” signifying that the heating
element has been activated. Allow 10-45 minutes for the display to read “Ready” signifying the water tank has
reached operating temperature. (Note: Heatup time is dependent on water inlet temperature and input wattage
to the machine.)

Figure 2

Figure 3

Move red wire on transformer to:

• “H2” for 208V supply

• “H3” for 240V supply

Model FDD2500 Page 5

Programming Machine from Touchpads

Tools Required: None

MACHINE PROGRAMMING: The machine operating parameters can be changed from the touchpad and LCD display
without opening up the machine. (See illustration below).

To enter Programming Mode:
Press and hold (>) and (+) at the same time for approximately 5 seconds.
Tip: Use the eraser end of two pencils to press the buttons if you are having difficulty entering programming mode.

To Exit programming mode at anytime:

• Wait 20 seconds without pressing a button.

• The display will prompt “Exit?”

• Press (+) or (-) to toggle between YES and NO.

• After selecting YES, you MUST press (>) to SAVE changes, or wait for ready message and machine
will exit without saving.

Tip: To verify changes successfully save, re-enter programming mode and check settings.

1) Press (>) to select Language. (1A)
Press (+) to choose English, Spanish, German, or French.

2) Press (>) to set the Time of day on the machine.
Press (+) or (-) to change the time.

3) If password is activated, enter password now.
a) Press (+) to enter first number.
b) Press (>), then (+) to enter second number.
c) Press (>), then (+) to enter third number.

NOTE: The default password is “111”. If the password has been changed and forgotten, press “I/O” and “+” at the
same time to proceed.

4) Press (>) to change Password settings. (2B)
Press (+) or (-) to toggle between ON (enable password) and OFF (disable password).
If ON is selected, press (>) to change password.

a) Press (>) to enter new password. (following steps 3 a, b, c)
b) Press (>) to confirm new password. (following steps 3 a, b, c)

5) Press (>) to program Dispense Settings. (to change Portion Sizes) (2E) (For FDD2500-**-3A models only)
a) Press (+) for message “Select Dispense Button”. (5A)
b) Press the dispense button for the dispense head you wish to adjust the settings. LCD will display L, M,

or R for left, middle, or right dispense head to acknowledge your selection.

c) Once the dispense head is selected, press (+) or (-) to change the amount of time (portion size) for the

beverage being dispensed.

6) Press (>) to change Whipper Settings. (5A1)
a) Press the dispense button for the dispense head you wish to adjust the settings. LCD will display L, M,

or R for left, middle, or right dispense head to acknowledge your selection.

b) Once the dispense head is selected, press (+) or (-) to toggle between ON (turn whipper ON) and OFF

(turn whipper OFF).

7) Press (>) to return to Dispense Settings. (2E)
Repeat steps 6 & 7 for remaining heads.

8) Press (>) to modify Drink Strength. (7A)
a) Press (>) to Select a Dispense Button. (7B)
b) Press the dispense button for the dispense head that you want to change the drink strength for.
c) Press (+) or (-) to modify the auger speed which changes the drink strength (0-100% of maximum auger

speed in 1% increments).

Note: A faster speed will result in a stronger drink and a slower speed will result in a weaker drink.

PROCEED

POWER ON/OFF

(STANDBY)

INCREMENT UP

INCREMENT DOWN

Page 6 Model FDD2500

Programming Machine from Touchpads (cont.)

9) Press (>) to modify Auger Delay.
a) Press (>) and select dispense button.
b) Press the dispense button for the dispense head that you want to change the auger ON delay time.
c) Press (+) or (-) to modify the time in tenths of a second.

10) Press (>) to modify Auger Off Delay.
a) Press the dispense button for the dispense head that you want to change the auger OFF delay time.
b) Press (+) or (-) to modify the time in tenths of a second.

11) Press (>) to change Heater settings. (8A)
Press (+) or (-) to toggle between ON (water tank heater ON) and OFF (water tank heater OFF).

12) Press (>) to modify Water Tank Temperature. (7A)
Press (+) or (-) to increase or decrease water tank temperature.

13) Press (>) to modify Low Temp/No Brew settings. (7B)
Press (+) or (-) to toggle between ON (will not allow drinks to dispense if water temperature is below
programmed temperature) and OFF.

a) If turned ON press (>) to modify Minimum Dispensing Temp.
b) Press (+) or (-) to increase or decrease Minimum Dispensing Temp.

14) Press (>) to change Sleep Mode settings. (8A)
Press (+) or (-) to toggle between OFF and ON (forces the water tank temperature to a programmed temperature
after a programmed time of inactivity – used for energy savings).

a) If turned ON, press (>) to change Sleep Mode Settings.
b) Press (+) or (-) to increase or decrease the amount of time the unit is inactive before going into sleep mode.
c) Press (>) to change sleep mode water tank temperature setting.
d) Press (+) or (-) to increase or decrease the water tank temperature during sleep mode.

15) Press (>) to view Manual Dispense mode. (9A)
(Models with manual Free-Flow Tomlinson handles cannot be changed to portion control.)

16) Press (>) for Sales Mode. (14A) (This option for future use. “Free” is currently the default setting.)

17) Press (>) to retrieve Sales Data. (15A)

18) Press (>) to view Total Dispense data (number of drinks dispensed per head). (15B)
Press the dispense buttons that you want to retrieve information about.
After viewing each head’s data, proceed to next step.

19) Press (>) to view Total Brews data. (15E)
LCD will display total number of drinks dispensed by the unit.

20) Press (>) for Clear Data options. (16A)
Press (+) or (-) to toggle between YES (resets sales data counter to “0”) and NO.

Important: After selecting YES and then pressing (>) all data will be cleared immediately.

21) Press (>) to view Dispenser Type. (17A)
LCD will display type of dispenser.

22) Press (>) to display Date Code information. (18A)
LCD will display manufacture date.

23) Press (>) to display Software Version on controller. (19A)
Displays current software version stored in controller memory.

24) Press (>) to Retrieve Error Codes. (20A)
Press (+) or (-) to toggle through and review all error codes. The LCD will display the number of times each
error code has occurred. Error Codes:
SC1: No Water Pressure
SC2: Reset Power (Error has occurred that requires power to be reset).
SC3: Low Water Level (Inlet valve ON for more than 5 minutes.)

Model FDD2500 Page 7

Programming Machine from Touchpads (cont.)

24) Press (>) to Retrieve Error Codes. (20A) (cont.)
SC4: Thermistor Failure (Temperature is out of range – less than 32°F or greater than 210°F.)
SC6: Check Heating (Tank is too hot.)
SC8: Overcooling
SC9: Overflow (Water level safety probe is tripped.)
SC10: Adjust Temperature (Temperature adjusted from touchpad.)

25) Press (>) for Clear Error Code options. (20B)
Press (+) or (-) to toggle between YES (clears all stored error codes from memory) and NO.

Important: After selecting YES and then pressing (>) all data will be cleared immediately.

26) Press (>) for EXIT option
Press (+) or (-) to toggle between YES and NO.

Important: After selecting YES, you MUST press (>) to SAVE changes, or wait for READY message and machine
will exit without saving.

FILLING PRODUCT HOPPERS (see Figure 4)

1) Open door.

2) Lift hinged top.

3) Remove hopper lid.

4) Carefully pour product into hopper.

5) Replace hopper lid.

6) Lower hinged top.

7) Close door.

THERMOSTAT ADJUSTMENT

(See machine programming procedure: Water tank temperature)

Tools required: None
NOTE: The thermostat range is approximately 40°F to 205°F (4°C to 96°C). The water tank temperature is factory

set at 190°F (87°C), making the beverage temperature slightly lower than 190°F (87°C).

HOW TO DISPENSE A DRINK

Machine is equipped to dispense into cups, decanters, 1.3 L servers, 2.2 L airpots or hose connected to 5 gal. containers.

WARNING: Server must rest flat on tray with a 1/4" (6 mm) clearance between cup and spout. Contents can cause
severe burns if handled improperly.

For Manual Machines FDD2500-1-M-B and FDD2500-3-M-B:

1) Place a server under the selected drink dispense nozzle.

2) Pull dispense handle until cup is 2/3 full, then release handle.

For Automatic Machines FDD2500-1-3A-B and FDD2500-3-3A-B:

1) Place a server under the selected drink dispense nozzle.

2) Press and release desired dispense button.

NOTE: To stop a dispense, simply press-and-release any button.

Figure 4

 WARNING: Disconnect power before servicing machine.

DRINK STRENGTH ADJUSTMENT
Tools required: None

1) Dispense a drink to determine if drink is too strong or weak.

2) See Drink Strength section within machine programming.

NOTE: Water flow rate cannot be adjusted. Flow rate will be in the range
of 2.0-2.4 oz/second. To change drink

strength, adjust auger speed from the programming menu.

Estimated grams of coffee per ounce of water for Soluble and Freeze
Dried Coffee at each auger speed setting (see chart on right):

Auger (%)

Soluble Coffee
(grams/oz)

Freeze Dried
Coffee (grams/oz)

15 0.13 0.11
20 0.17 0.15
25 0.22 0.20
30 0.28 0.24
35 0.32 0.29
40 0.39 0.33
45 0.44 0.36
50 0.54 0.40
55 0.55 0.43
60 0.62 0.46
65 0.70 0.50
70 0.73 0.54
75 0.77 0.55
80 0.84 0.63
85 0.88 0.63

Page 8 Model FDD2500

PORTION SIZE ADJUSTMENTS (FDD2500-*-3A-B Models Only)
To adjust portion sizes for each button, adjust times within “Dispense Settings” section from the programming menu.
Estimated portion times for given volumes:

Weekly Cleaning

Cleaning the Funnel – Disassembly Cleaning the Funnel – Reassembly

1.

Open the door and remove the large tube
from the funnel cover, then remove the
cover.

1.

Place funnel into position, then
connect hoses.

2.

Remove the mixing funnel by removing sili­cone tube at the side, then remove funnel.

2.

Place funnel cover on funnel and connect
large tube.

3.

PARTS IN CONTACT WITH FOOD MUST BE WASHED,
RINSED, SANITIZED, AND AIR DRIED.

Daily Cleaning

1.

CAUTION: When cleaning the unit, do not use cleansers, liquid bleach, powders or any other substance that contains

chlorine. These products promote corrosion of stainless steel and plastic parts. Use of these products will void the warranty.

Empty drip pan as needed and wash daily in a dish detergent.

Wipe down all surfaces of the dispense spouts, product storage cabinet, splash panel and drip tray areas with a clean
soft cloth using a mixture of one ounce Ivory liquid detergent (or equivalent) to one gallon of fresh water. Follow by
wiping down all surfaces of the dispense spouts, product storage cabinet, splash panel and drip tray areas with a clean
soft cloth moistened with fresh water and allow to air dry.

2.

Rinse out the funnel by placing the rinse switch (located to the right of the dispensing valves
when the door is open) in the ON position. Dispense one to two cupfuls until the water is clear.
Short bursts of dispensing may also help clean the chambers. When
complete, return the rinse switch to the OFF position.

 WARNING: Disconnect power before servicing machine.

 WARNING: Do not use a water jet to clean machine. Risk of electric shock.

Cleaning

Ounces Liters

Portion Time
(seconds)

12 0.35 5.3

32 1.0 14

44 1.3 9

60 1.8 26

74 2.2 33

84 2.5 38

5 Gallons 19 280

Model FDD2500 Page 9

Cleaning (cont.)

Weekly Cleaning (cont.)

Cleaning Hoppers – Disassembly Cleaning Hoppers – Reassembly

CAUTION: Do not wash hopper without first

disassembling.

IMPORTANT: All components must be completely dry prior
to reassembly.

1.

Open door, disconnect large hose from
funnel cover and then lift off funnel
cover.

1.

Place driveshaft bearing inside hopper
with threads going through hole in the
rear of the hopper.

2.

Lift off ring heater and set aside.

2.

Secure the bearing by attaching the palnut
to the bearing outside rear hopper opening. Use
one hand inside the hopper to push
the bearing outward while turning the
palnut clockwise.

3.

Lift open lid and remove coffee spill
pan.

4.

Remove the hopper from the cabinet.

3.

Install the auger spring driveshaft
and the auger spring by inserting the
flat end of the spring into the
hole in the auger spring driveshaft.

5.

Remove the hopper
cover and empty
hopper contents.

4.

Insert assembly into lower front hopper
opening, making sure the threaded end of
the auger spring driveshaft completely
inserts into the plastic driveshaft bearing in
the rear of the hopper. The driveshaft
bearing threads should be accessible
from the outside rear of the hopper.

6.

Remove the auger pinwheel by pulling it
forward while stretching out the sides of
the hopper.

5.

Place the washer over the driveshaft
bearing threads followed by securing
the drivelink onto the driveshaft bearing
by turning counterclockwise. Secure
the auger spring with one hand while
attaching the drivelink with the other.

7.

Remove the drivelink and washer at
the rear of the hopper by holding the
auger spring with one hand at the front
of the hopper while turning the drivelink
clockwise with the other hand.

6.

Replace the auger pinwheel making sure
the pins are securely positioned inside the
locator holes in the hopper.

8.

Remove the auger
spring and auger spring
driveshaft by pulling out
through the lower front open­ing of the hopper.

7.

Carefully fill
the hopper
with product
and replace
the cover.

9.

Remove the palnut at the
rear of the hopper by turning
it counterclockwise then remove
the driveshaft bearing from the
inside of the hopper.

8.

Reinstall hopper into the
machine, making sure it is
properly aligned.

10.

All parts in contact with food must be washed, rinsed,
sanitized, and air dried.

1

Install ring heater to front spout.

Open lid and install coffee

spill pan.

11.

Driveshaft

Bearing



PULL

Auger Spring

Driveshaft

9.

10.

Install funnel cover with large
tube attached.

Page 10 Model FDD2500

Prepare for Shipment

Important: Always completely empty water tank and PRODUCT HOPPERS prior to shipping unit. (See Draining

the Tank and Cleaning the Hoppers section).

NEVER SHIP UNIT WITH PRODUCT IN HOPPER OR WATER IN TANK –

THIS WILL CAUSE IRREPARABLE DAMAGE.

Draining the Tank

Always empty the tank before shipping.

WARNING: Draining of the tank should be performed by a qualified service technician. The tank contains

7.5 gallons (28.4L) of very hot water. May cause severe burns.

1.

Prepare a heat resistant container to drain 7.5 gallons
(28.4L) of hot water from the tank into.

5.

Pinch hose with fingers and
remove the hose clamp
and plug.

2.

Disconnect power to machine.

6.

Allow the tank to drain
completely.

NOTE: It may be necessary to pinch
the hose and stop the water before
container is full. Carefully re-install
plug, then empty container. Repeat
steps 4-6 to completely drain tank.

3.

Remove the drain tray and front access panel.

7.

Once the tank is empty, securely
replace the plug and clamp on
the end of the hose. Reposition
the drain hose.

4.

Locate the silicone drain hose.
Put the end of the drain hose
into the container. Secure the
end of the drain hose (i.e. with
tape) into the container.

8.

Reassemble the front access panel and drain tray.



Model FDD2500 Page 11

REPLACING COMPONENTS
Tools Required: Phillips Head Screwdriver

1. Remove drain tray.

2. Remove 2 screws then remove front panel.

3. Remove 4 screws then remove lid.

4. Lift off side panels and/or rear panel.

5. Replace components as needed.

 WARNING: Disconnect power before servicing machine.

ADJUSTMENT TO “ADD PRODUCT” SENSORS

Capacitive Sensors might need to be adjusted if either situation occurs:

• Hoppers are full and display reads “ADD PRODUCT” when attempting a dispense.

• Hoppers are empty and display does NOT read “ADD PRODUCT” when attempting
a dispense.

Adjusting Capacitive Sensors:

1. Remove one hopper.

2. Install empty hopper securely in place.

3. With small screwdriver, turn adjustment inside sensor until light turns ON.
(see Figure 5)

4. Slowly turn adjustment until light turns OFF.

5. Display should read “Add Product”.

6. Install full hopper.

7. Display should NOT read “Add Product”.

8. Readjust if needed.

9. Repeat on other head if needed.

Figure 5

REPLACING CONTROLLER
Tools Required: Phillips Head Screwdriver

1. Remove 4 screws and lift off lid.

2. Lift off right side panel.

3. Carefully disconnect each wiring connector from controller.
NOTE: Pull only on connectors. Do not pull on wires.

4. Carefully spring-back mounting clips and lift controller out of clips.
NOTE: Do not pull or press on sensitive controller components. Handle controller by

touching the edges.
NOTE: Reverse procedure to install controller. Make sure connector ramps and pins

are properly aligned before installing connectors.