Page 1
MCD425A/W, R425A/W, MFD425A/W, P425A/W
Ice Machines
Operation and Service Manual
MCD425A/W_S
R425A/W
P425A/W
MCD425A/W_T
MFD425A/W_T
Following installation, please forward this manual
totheappropriate operations person.
801 Church Lane • Easton, PA 18040, USA
Toll free (877) 612-5086 • +1 (610) 252-7301
www.follettice.com
01033646R03
Page 2
2 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 3
Contents
Welcome to Follett. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Before you begin ............................................................................ 4
Specications .............................................................................. 5
Electrical ................................................................................ 5
Plumbing ................................................................................ 5
Ambient ................................................................................. 5
Water usage (water-cooled condenser only) .................................................... 5
Dimensions and clearances ................................................................. 6
Operation .................................................................................. 7
Cleaning/descaling and sanitizing ............................................................ 7
Weekly ................................................................................. 7
Monthly ................................................................................. 7
Semi-Annually (more often if conditions dictate) ................................................. 7
Service .................................................................................... 9
Ice machine Operation (all models) ........................................................... 9
Water system ........................................................................... 10
Electrical system ..........................................................................11
Technical specications (all models) ......................................................... 13
Electrical control system schematic .......................................................... 14
Electrical control system operation ........................................................... 15
Refrigeration system (all models) ............................................................ 24
Replacement parts ......................................................................... 27
Replacement ice machine ordering matrix ..................................................... 27
Air-cooled skins assembly (MCD425A_S, R425A) .............................................. 28
Water-cooled skins assembly (MCD425W_S, R425W) ........................................... 29
Louvered docking station (MCD425A/W_T) .................................................... 30
Electrical components ....................................................................31
Evaporator ............................................................................. 32
Air-cooled ice machines ................................................................... 34
Water-cooled ice machines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 3
Page 4
Welcome to Follett
!
MCD425ABT
Application
V – Vision
B – Bin
H – Harmony
Configuration
S – RIDE
®
T – top-mount
Ice machine capacity and refrigerant
400 – 425 lbs (193 kg)/day, R404A
Ice machine series
Nugget ice machine
Voltage
D – 115V 60Hz
Condenser type
A – air-cooled
W – water-cooled
MCD – RIDE model installation, Vision
™
ice and beverage dispensers and top installation, Follett ice storage bins
R – Remote installation, Symphony
™
ice and water dispensers
P – Replacement icemaker, Symphony ice and water dispensers
Flake ice machine
MFD – Top installation, Follett ice storage bins
Follett equipment enjoys a well-deserved reputation for excellent performance, long-term reliability and outstanding
after-the-sale support. To ensure that this equipment delivers that same degree of service, we ask that you review
the installation portion of this manual before beginning to install the unit. Our instructions are designed to help you
achieve a trouble-free installation. Should you have any questions or require technical help at any time, please call
our technical service group at (877) 612-5086 or +1 (610) 252-7301.
Note: To expedite assistance, all correspondence or communication MUST include the model number, serial number
and complete and detailed explanation of the problem.
Before you begin
After uncrating and removing all packing material, inspect the equipment for concealed shipping damage. If damage
is found, notify the shipper immediately and contact Follett Corporation so that we can help in the ling of a claim,
if necessary.
Check your paperwork to determine which model you have. Follett model numbers are designed to provide
information about the type and capacity of Follett equipment. Following is an explanation of the different model
numbers in the 425 series.
Important cautions
Moving parts. Do not operate with front cover removed.
Hot parts. Do not operate with cover removed.
To reduce risk of shock disconnect power before servicing.
Most ice machine cleaners contain citric or phosphoric acid, which can cause skin irritation. Read caution label
on product and follow instructions carefully.
Ice is slippery. Maintain counters and oors around dispenser in a clean and ice-free condition.
Ice is food. Follow recommended cleaning instructions to maintain cleanliness of delivered ice.
4 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 5
Specications
Electrical
§ Each ice machine and dispenser require a separate circuit with electrical disconnect within 10 ft (6 m).
§ Equipment ground required.
§ Standard electrical – 115 V, 60 Hz, 1 phase.
§ Connect to a dedicated 15A circuit.
§ Maximum ice machine amperage – 11A each.
§ Cord and plug provided on ice machine.
Plumbing
§ 3/8" FPT water inlet
§ 3/4" MPT drain
§ 3/8" FPT condenser inlet (water-cooled condenser only)
§ 3/8" FPT condenser drain (water-cooled condenser only)
Notes:
§ Slope to drain of 1/4" per foot (6 mm per 30.4 cm run) with a 1/2" min. is recommended.
§ Water shut-off recommended within 10 feet (3 m), drain to be hard piped and insulated.
§ Separate drains for ice machine and condenser. To prevent back ow, do NOT connect drains.
§ Follett recommends a Follett water lter system be installed in the ice machine inlet water line (standard capacity
#00130229, high capacity #00978957, carbonless high capacity #01050442).
Ambient
Air temperature* 100 F/38 C max. 50 F/10 C min. (best performance below 80 F/27 C)
†
Water temperature
90 F/32 C max. 45 F/10 C min. (best performance below 70 F/21 C)
Water pressure 70 psi max. (482 kPA) 10 psi min. (68 kPA)
Condenser water
90 F/32.2 C max. 45 F/7.2 C min
temperature
Condenser water
125 psi (862 kPA) max. 10 psi (68 kPA) min.
pressure
*
Ambient air temperature is measured at the air-cooled condenser coil inlet.
†
Ambient water temperature is measured in the ice machine reservoir.
Water usage (water-cooled condenser only)
§ 0.25 gpm @ 50 F (10 C)
§ 0.5 gpm @ 70 F (21 C)
§ 1.25 gpm @ 90 F (32 C)
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 5
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Dimensions and clearances
§ Entire front of ice machine must be clear of obstructions/connections to allow removal.
§ 12" (30.5 cm) clearance above ice machine for service.
§ 6" (15.3 cm) minimum clearance between exhaust side of ice machine and any adjacent equipment.
§ MCD425A & R425A – 18" (45.7 cm) minimum, 10 ft (3 m) maximum clearance between discharge and air
intake grilles.
MCD425A/W_T
MFD425A/W_T
Front view — top mount
Side view — top mount
21.29" (54.1 cm)
MCD425A/W_S
R425A/W
Front view — air-cooled
2.5" (6.4 cm)
18.88" (48 cm)
Front view — water-cooled
C
F
B
4.81"
(12.0 cm)
A
2.31" (5.7 cm)
C
22.49" (57.1 cm)
Back view — top mount
15.22" (38.7 cm)
11.03" (28.0 cm)
8.03" (20.4 cm)
5.03" (12.8 cm)
2.34" (6 cm)
A – 3/4" MPT drain
B – 3/8" FPT water inlet
C – Electrical cord
2.32"
(5.9 cm)
CONDENSER
OUTLET
22.69" (57.6 cm)
C
E
D
22.46" (57.1 cm)
18.88" (48 cm)
Side view — air-cooled and water-cooled
E
8.25" (20.9 cm)
10.62" (27.0 cm)
22.75" (57.8 cm)
20.75" (52.7 cm)
D
B
A
17.00"
4.40" (11.2 cm)
(43.2 cm)
RIDE model air-cooled units only
D – 3/8" FPT condenser inlet
E – 3/8" FPT condenser drain
F – Bin signal connection (DO NOT APPLY VOLTAGE!)
F
B
A
4.81"
(12.0 cm)
2.31"
(5.7 cm)
5.25"
(13.3 cm)
6 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
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Operation
Cleaning/descaling and sanitizing
Follett ice machines and dispensers, and their associated cleaning and sanitizing procedures, are designed for
use with potable water sources. The presence, or suspected presence, of infectious agents may call for additional
measures, including the replacement of components and more comprehensive disinfection measures. Follett
recommends that these cleaning and sanitizing procedures be reviewed with the appropriate infectious agent subject
matter experts to assure complete remediation.
Periodic cleaning/descaling and sanitizing of Follett’s ice machine system is required to ensure peak performance
and delivery of clean, sanitary ice. The recommended cleaning procedures that follow should be performed at least
as frequently as recommended and more often if environmental conditions dictate.
Cleaning of the condenser can usually be performed by facility personnel. Cleaning/descaling and sanitizing of
the ice machine system should be performed by your facility’s trained maintenance staff or a Follett authorized
service agent. Regardless of who performs the cleaning, it is the operator’s responsibility to see that this cleaning is
performed according to the schedule below. Service problems resulting from lack of preventive maintenance will not
be covered under the Follett warranty.
Symphony Plus Frequency
Drain Line weekly
Drain Pan/Drip Pan weekly
Exterior, Water Station Tube as needed
Condenser monthly (air-cooled only)
Ice Machine semi-annually
Transport Tube semi-annually
* Ice machine must be sanitized prior to start-up.
Weekly
The exterior may be cleaned with a stainless cleaner such as 3M* Stainless Steel Cleaner & Polish or equivalent.
* 3M is a trademark of 3M Company.
Monthly
Condenser (air-cooled ice machine only)
1. Use a vacuum cleaner or stiff brush to carefully clean condenser coils of lint and debris to ensure optimal
performance.
2. When reinstalling counter panels in front of RIDE model ice machines, be sure that ventilation louvers line
up with condenser air duct.
Semi-Annually (more often if conditions dictate)
§ A cleaning/descaling and sanitizing procedure should always include both the ice machine and bin/dispenser.
§ Icemaking system can be cleaned/descaled in place.
Cleaning & Sanitizing Tool Checklist
§ (2) 1.5 gallon (or larger) plastic buckets
§ (2) clean cloths
§ Sanitary gloves
§ Safety glasses
§ (2) Sani-Sponge™ (P/N 00131524 - single sponge)
§ (1 ) Packet of SafeCLEAN™ (P/N 00132001 - 24 packets)
§ 1.6 oz. of Nu-Calgon IMS-II or IMS-III Sanitizer (P/N 00979674 - 16 . oz. bottle)
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 7
Page 8
CAUTION!
§ Wear rubber gloves and safety goggles (or face shield) when handling cleaner or sanitizer mixtures.
§ Use only Follett approved cleaners.
§ It is a violation of Federal law to use the Cleaning or Sanitizing solution in a manner inconsistent with their
labeling.
§ Do not use solvents, abrasive cleaners, metal scrapers or sharp objects to clean any part of the dispenser.
Cleaning Solution: Mix cleaning solution of 1 gal. (3.8 L) 100 F (38 C) water and 7 oz. (198 g) (one 7 oz. packet) of
Follett SafeCLEAN ice machine cleaner/descaler (P/N 00132001).
Sanitizing Solution: Mix a sanitizing solution of 1 gal. (3.8 L) 100 F (38 C) water and 1.6 oz. (47 ml) Nu-Calgon IMS-II or
IMS-III Sanitizer (P/N 00979674).
Cleaning/descaling procedure
Note: Check drains and drain cup to ensure they are open and owing freely.
1. If ice machine was running recently, ensure that the evaporator is completely free of ice before proceeding.
If there is ice in the evaporator, complete steps 2-7 using only hot water to remove the ice then begin
Cleaning/Descaling Procedure again.
2. Remove front or top cover.
3. Disconnect bin signal cable from ice machine electrical box.
4. Press CLEAN switch. The MAINTENANCE light will turn on and the machine will drain. Wait for the LOW
WATER light to turn on.
5. Remove lid from cleaning cup and ll (about 1 quart) until cleaning solution completely lls the reservoir.
Place lid back on cup.
6. CLEANER FULL light will turn on and machine will start cleaning cycle then rinse three times; this process
takes approximately 15 minutes.
7. When machine is nished cleaning, the MAINTENANCE light will turn off.
Sanitizing Procedure
8. Press CLEAN switch. The MAINTENANCE light and LOW WATER light will turn on.
9. Fill cleaning cup with sanitizing solution until completely lls the reservoir. Place lid back on cup. Save
remainder of sanitizing solution.
10. CLEANER FULL light will turn on and machine will start sanitizing cycle then rinse three times; this
process takes approximately 15 minutes.
11. When machine is nished rinsing, the MAINTENANCE light will turn off. Remove top bearing insulation and
nozzle insulation, then loosen phillips-head screw on nozzle connected to evaporator. Remove nozzle from
evaporator side only, leave other side of nozzle connected to transport tube.
12. Place one Sani-Sponge in remaining sanitizing solution.
13. Insert the sponge soaked in sanitizing solution into nozzle then insert a dry sponge into the nozzle.
14. Replace nozzle onto evaporator and tighten screw. Ensure drain is connected to reservoir and vent tubes
are connected to evaporator drain pan.
15. Reconnect bin signal cable. Wait for ice to push sponges through transport tube.
16. Collect sponges from ice storage bin.
1 7. Replace front or top cover.
18. After 10 minutes, dispense all ice and discard.
19. Clean/descale and sanitize dispenser/bin.
8 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
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Service
Ice machine Operation (all models)
Follett’s ice machine consists of four distinct functional systems:
§ Harvesting system
§ Water system
§ Electrical control system
§ Refrigeration system
These four systems work together to accomplish the production and harvesting of ice. A problem in any one of these
systems will result in improper operation of the entire ice production cycle. When troubleshooting the ice machine,
it is important to analyze the entire system operation to determine which system is not functioning properly, then
pinpoint the component within that system that is malfunctioning. Determine what corrective action must be taken
before making any adjustments or replacing any components.
The icemaking process
The Maestro Plus ice machine uses a stainless steel jacketed evaporator and operates on a continuous freezing
cycle. Water is supplied to the evaporator from the water reservoir where the water level is controlled by a oat valve.
This valve also shuts off the water supply when the ice machine is not running.
When the ice machine is running, a layer
of ice forms on the interior surface of the
evaporator. This ice is continuously removed
by a slowly rotating (12RPM) auger. The
auger carries the ice upward into the cavity
formed by the top bearing housing and the
compression loop, where it is compressed to
remove excess water. When the ice reaches
the desired hardness it rotates within the
cavity and is forced through a discharge
port and compression nozzle and into the
ice transport tube. The discharge tube and
compression nozzle are slightly restricted to
further compress the ice and produce the
desired hardness.
A solid state control board located in the
electrical box of the ice machine controls
the normal operation of the ice machine
and monitors gearmotor torque. This control
board will shut down the ice machine should
an over-torque condition occur. It is very
important that you familiarize yourself with
the operational sequences detailed in this
manual before attempting to service the ice
machine.
water
inlet
evaporator
port
ice transport tube
compression nozzle
auger
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 9
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Water system
B
A
C
D
The water level in the evaporator is controlled by a ll solenoid (Fig 1) and level detecting sensors. Water sensing
rods (Fig. 2) extend down into the reservoir at the end of the evaporator assembly. The system works via electrical
conductivity as follows:
One of the longest probes is a common. When water is between any of the other probes and the common, the
PC board will sense the activation. During normal operation, the water level rises and falls between the Normal
High and Normal Low sensors. As water is consumed to make ice, the level will fall until the Normal Low sensor is
exposed, triggering the water feed solenoid on. Water will ll until the Normal High sensor is activated.
Note: The potable water dissolved solids content must be greater than 10 ppm for the water control system to
function properly. If using reverse osmosis water ltration system, ensure T.D.S level is greater than 10 ppm.
Fig. 1 Water system diagram
VENT
CLEANING CUP
RESERVOIR FILL
ICE
NOZZLE
SOLENOID
EVAPORATOR
DRAIN PAN
DRAIN
Fig. 2 Water level diagram
A ALARM LOW (RED)
B COMMON (BLACK)
C NORMAL HIGH (ORANGE)
D NORMAL LOW (YELLOW)
WATER
RESERVOIR
WATER SUPPLY
3/8" FPT, 45-90 F (7-32 C)
10-70 PSI (69-483 KPA)
WASTE WATER DRAIN
3/4" FPT
C
NORMAL OPERATING RANGE
D
A
B
10 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
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Electrical system
FLASHINGON or OFF
Legend:
OFFON
ATTENTION!
To prevent circuit breaker overload, wait 15 minutes before restarting this unit. This allows the compressor
to equalize and the evaporator to thaw.
Normal control board operation
The PC board indicator lights provide all the information necessary to determine the machine's status. Green
indicator lights generally represent “go” or normal operation; Yellow indicators represent normal off conditions; Red
indicators generally represent alarm conditions, some of which will lock the machine off.
A ashing green light labeled POWER indicates power to the machine. All other normal operation status indicators
are covered as follows:
Ice machine disposition Operating conditions
1. Ice machine is making ice. 1. Normal running.
2. Ice machine is not making ice.
DIP Switch Settings
OFF POSITION ON POSITION
MCD425A/W_T, MCD425A/W_S, R425A/W
OFF ON
Sleep cycle
disabled
Not used
Sleep cycle
dispense duration
20 min. time delay
Flush disabled
Maint. timer ON
Replacement P425A/W installed in Symphony dispenser
OFF ON
Sleep cycle
disabled
Not used
Sleep cycle
dispense duration
20 min. time delay
Flush disabled
Maint. timer ON
1 2 3 4 5 6 7 8
Sleep cycle
enabled
Not used
Sleep cycle
dispense duration
60 min. time delay
Flush enabled
Maint. timer OFF
1 2 3 4 5 6 7 8
Sleep cycle
enabled
Not used
Sleep cycle
dispense duration
60 min. time delay
Flush enabled*
Maint. timer OFF
2. Normal time delay. When the bin lls with ice, the LOW BIN
light goes out momentarily and the refrigeration and auger
drive systems immediately shut down. (Note: The fan motor
will continue to run for 10 minutes to cool condenser) The TIME
DELAY light comes on, initiating the time delay period. When
the time delay expires, the machine will restart provided that the
LOW BIN light is on.
425A/W installed in Symphony Plus
25/50/110 CI, CT, or FB
OFF ON
1 2 3 4 5 6 7 8
Sleep cycle
disabled
Not used
Sleep cycle
dispense duration
20 min. time delay
Flush disabled
Maint. timer ON
Sleep cycle dispense duration
OFF ON
1 2 3 4 5 6 7 8
4 5 4 5
35 s
15 s
Sleep cycle
enabled
Not used
Sleep cycle
dispense duration
60 min. time delay
Flush enabled
Maint. timer OFF
4 5 4 5
5 s
60 s
* Flush can be enabled on Symphony CT and FB models. Flush should be disabled on Symphony CI units due to risk of internal leak if
drain line is blocked. All Symphony Plus models should be set to Flush enabled.
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 11
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Relay/triac output indication
Each relay on the board has an indicator light associated with its output. For example, when the relay for the water
feed solenoid is energized, the adjacent indicator light glows green.
Flushing logic
Off cycle: At the completion of off-cycle time delay, the machine checks for a cumulative one (1) hour of ice making
time since the last off-cycle ush. If the cumulative ice making time exceeds one (1) hour, the machine will open
the drain valve for 60 seconds to drain the evaporator in its entirety. It will then rell with water, ush again and rell,
and begin making ice. If the ice making time is less than 1 hour, the machine will start and begin making ice without
draining the evaporator.
Error faults
The Maestro Plus PC board monitors various operating parameters including high pressure, auger gearmotor
amperage limits, clogged drain, and low water alarm conditions. There are two types of errors namely “hard” or “soft”.
A hard error is one that shuts the machine off and will not allow restart until the reset button is pressed. Even cycling
power will not reset a hard error. A soft error can either be automatically reset should the condition rectify, or if power
is cycled. Should an error occur, consult the troubleshooting guide in this manual or a Follett service technician.
Soft errors:
Note: For all soft errors, the ice machine will remain off for 1 hour.
LO WATER: During operation, the water level cycles between the normal low and normal high sensors. Should the
water be shut off to a running machine, a soft error will occur. The error sequence is as follows: During operation,
the water level falls to the normal low sensor, and when it does the water feed solenoid is energized. If water is not
detected at the normal low sensor within 10 seconds, a soft error will occur. The machine will shut down and TIME
DELAY and LOW WATER LEDs will be lit. After time delay, the solenoid will energize and remain energized until the
water level is sufficient for restart.
HI PRESSURE: Should the refrigeration pressure rise above 425 psi, the machine will shut down and the TIME
DELAY and HIGH PRESSURE will be illuminated. After the time delay, and if the pressure has fallen back below the
reset point of 295 psi, the machine will restart and the TIME DELAY and HIGH PRESSURE will clear.
HI AMPS: The PC board monitors the amperage of the auger motor. Should the gear motor experience current draw
above the allowable 3A limit or no current draw (0A), the machine will shut down and the TIME DELAY and HI AMP
will be illuminated. After the time delay the machine will restart and the TIME DELAY and HI AMP will clear.
Hard error:
HI AMPS: If a second hi-amp error occurs within 1 hour of the initial hi-amp error, the ice machine will shut off and
the reset on the board must be pressed to clear the error. If a second hi-amp has occurred, the HI AMP LED only will
be illuminated.
DRAIN CLOG: The drain clog sensor, located in the evaporator drain pan will detect the presence of water just below
the top edge of the pan. If water does not properly ow out of the internal or external drain lines it will backup into the
drain pan (especially during a self-ushing purge cycle). Pressing the reset button will restart the ice machine.
12 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 13
Technical specications (all models)
condenser
filter dryer
thermostatic
expansion
valve
evaporator
high side
service port
low side
service port
high pressure
switch
compressor
high
pressure
vapor
low
pressure
vapor
high
pressure
liquid
low
pressure
liquid
Refrigeration system diagram
Refrigeration pressure data
§ Water regulating valve is factory set at 300 (±10) PSIG head pressure.
§ Readings within 10% of table values should be considered normal.
Compressor data
Locked rotor amps 58.8A
Compressor current draw
Air-cooled
Ambient air temperature 60 F/15.6 C 70 F/21.1 C 80 F/26.7 C 90 F/32.2 C 100 F/37.8 C
Amperage 6.3A 6.5A 6.7A 6.9A 7.1A
High-side pressure (psi) 190 220 250 290 330
Low-side pressure (psi) 27 29 31 33 36
Water-cooled
Water temperature at oat 50 F/10 C 60 F/15.6 C 70 F/21.1 C 80 F/26.7 C 90 F/32.2 C
5.6A 5.6A 5.7A 5.8A 5.8A
Water-cooled Ice Machine Refrigeration Pressure
Discharge Pressure/Suction Pressure
Condenser inlet water temperature ˚F/˚C
˚F/˚C
50/10
70/21
90/32
Ice machine inlet water
temperature ˚F/˚C
Gearmotor data Split-Phase PSC (permanent split capacitor)
Gearmotor current 1.8A-1.9A (nominal) 0.8A-0.9A (nominal)
Locked rotor amps 14A 7A-14A (temperature dependent)
50/10
280/27
280/27
280/27
70/21
285/29
285/29
285/29
90/32
290/31
290/31
290/31
psi
psi
psi
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 13
Page 14
Air-Cooled ice machine capacity/24hrs.
Ambient Air Temperature F/C
F 60 70 80 90 100
C 16 21 27 32 38
50 460 425 390 355 320 lbs.
10 208 193 177 161 145 kg.
60 437.5 405 372.5 340 307.5 lbs.
16 198 184 169 154 139 kg.
70 415 385 355 325 295 lbs.
21 188 175 161 147 134 kg.
80 405 375 345 315 285 lbs.
27 184 170 156 142 129 kg.
90 395 365 335 305 275 lbs.
Inlet Water Temperature F/C
32 179 166 152 138 125 kg.
Note: Nominal values - actual production may vary by ±10%.
Electrical control system schematic
L1
L2/N
GND
DISP
BLACK #26
WHITE #25
GRN-YEL #24
BLACK #23
Water-Cooled ice machine capacity/24hrs.
Condenser Water Temperature F/C
F 50 60 70 80 90 100
C 10 16 21 27 32 38
50 486 465 443 422 400 389 lbs.
10 220 2 11 201 191 181 176 kg.
60 464 445 425 406 386 367 lbs.
16 210 202 193 184 175 166 kg.
70 443 425 408 390 372 358 lbs.
21 201 193 185 177 169 162 kg.
80 422 406 389 373 356 340 lbs.
27 191 184 176 169 161 154 kg.
90 400 385 371 356 341 326 lbs.
Inlet Water Temperature F/C
32 181 175 168 161 155 148 kg.
BLACK #23
BLACK #51
BIN
CONTACT
CLOSURE
WHITE #52
RED #54
BLACK #51
ORANGE #55
BLACK #56
GREEN #53
1 2 3 4 5 6 7 8 9
WHITE #62
WHITE #64
BLACK #61
BLACK #65
BLACK #66
GREEN #63
GREEN #67
2
5
6
1
4
C1 RUN
BLACK #66
BLACK #69
BLACK #68
BLACK #69
GREEN #57
BLACK #58
BLACK #59
COMPRESSOR
ELECTRICAL
BLACK #71
BOX
O.L.
C2 START
COMPRESSOR
P2
N N N N N N N N N
D37
P5
P4
DRAIN CLOG
SENSOR
T1
GRN #17
A B C D
BLACK #01
L1 L1L1
P1
P6
P21
P20
P19
P3
P22
RED #16
WHITE #121
WHITE #13
BROWN #14
BLACK #122
#15
FEED VALVE
#04
#05
FAN
DRAIN VALVE
BLUE #07
BLUE
BLACK
WHITE
START
RELAY
4
CAPACITOR
2
BLACK
YELLOW
3
BLACK
YELLOW
START
START
RUN
BLACK #51
WHITE #52
GREEN #53
COMP.
BLACK
WHITE
C
S
R
SPLIT-PHASE
RUN
PSC MOTOR
D17
D48
T.O.L.
T.O.L.
D19D22D21D20
CURRENT SENS
T2
OR
BLUE
K3
AUGER
WATER SENSOR
D18
RESERVOIR
ICE AUX WATER AUX
P15
P16
HI PRS
P14
P10
SERIAL COMM
P17
WATER LEVELS
BIN RS485
P11
P12
P18
P17
WATER LEVELS
VIOLET
BLACK
RED
ORANGE
YELLOW
BLACK
S2
P12
P13
P14
PRESS
D16
BIN
HI PRS
HIGH
MODEL SELECT
P9
2
1
PROGRAM
RESET
P7
P11
P
K1
6
5
RS485 UI
P8
CLEAN SAFE
COMPRESSOR
S1
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
MAINT.
CLEAN
14 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 15
Electrical control system operation
The P425A/W, MCD425A/W_S and R425A/W wiring diagrams which follow illustrate the circuitry of Follett ice
machines used with ice dispensers. Both normal operation of the ice machine (Stages 1–6) and non-normal
diagnostic sequences showing torque-out (Stages 7–10) for use in troubleshooting ice machine problems are
shown.
Circuitry notes
When the ice machine is used with a dispenser it receives power from the main power supply. Disconnect the
power source before performing service. When performing electrical service, always use a meter to determine
whether or not the components being serviced are energized.
§ High pressure cutout opens at 425 PSI and closes at 287 PSI (auto reset).
§ The bin signal input to the control board in the 425A/W ice machine must only be initiated by contact closure. Do
not supply power. To run the ice machine in the workshop, use the bin signal jumper (P/N 01069095).
Note: The operation stage descriptions that follow are based on the unit containing the split-phase gear
motor.
Normal operation – Stage 1
Power is supplied to L1 of the control board, the POWER LED light begins ashing. The ice level bin thermostat in
the dispenser is closed and calling for ice, supplying contact closure to the control board. The LOW BIN LED will
be on. The control board will now go through the start-up sequence. The board checks the water sensors (located
in the reservoir) for continuity between the common probe (B) and the high probe (C). If continuity is not sensed,
the water ll valve (P21) is energized.
Capacitor
YELLOW
NO CONNECT
BLACK
OR
T.O.L.
RED
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
R
S
C
Compressor
Start
Relay
WHITE
Drain
Valve
Drain Clog Sensor
Run
2
5
Compressor
Electrical Box
Fill
Valve
Start
1
Bin T-Stat
Fan
WHITE
N
L1
RED
BROWN
BLACK
BLUE
L1
P22
AUGER
Ice Dispense Input
N
BLACK
P6
P21
P20
P19
P3
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
Clean Switch
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 15
Page 16
Normal operation – Stage 2
When continuity is seen between B and C, the water valve de-energizes, the AUGER output (P4) comes on along
with the MAKING ICE LED. The auger gearmotor’s start windings are energized through a current style start relay
that is pulled in by the initial high current draw of the gearmotor.
PSC: Start winding
energized through
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
capacitor.
Capacitor
YELLOW
NO CONNECT
OR
BLACK
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
Drain
Valve
Fill
Valve
Drain Clog Sensor
Bin T-Stat
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
P6
P21
P20
P19
P3
P22
N
BLACK
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
Clean Switch
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
Normal operation – Stage 3
After the initial high current draw drops off, the gearmotor start relay contacts open, dropping out the start winding.
The condenser fan output (P3) comes on 0.5 seconds later.
PSC: Start
windings stay
energized.
Capacitor
YELLOW
BLACK
NO CONNECT
OR
T.O.L.
RED
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
R
S
C
Compressor
Start
Relay
WHITE
Drain
Valve
Drain Clog Sensor
Run
2
5
Compressor
Electrical Box
Fill
Valve
Start
1
Bin T-Stat
Fan
WHITE
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
Ice Dispense Input
N
BLACK
P6
P21
P20
P19
P3
P22
P4
P15
HI PRS
1 2 3 4 5 6 7 8
WATER LEVELS
BIN
COMPRESSOR
RESET
P11
Clean Switch
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
16 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 17
Normal operation – Stage 4
Water Sensors
One second (1 s) after the fan comes on, the COMPRESSOR output comes on. The compressor circuit uses both
run and start capacitors along with a potential start relay. The start capacitor in energized through the normally
closed contacts of the start relay.
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
Capacitor
YELLOW
NO CONNECT
BLACK
OR
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
Drain
Valve
Fill
Valve
N
L1
RED
BROWN
BLACK
BLUE
L1
P6
P3
P22
AUGER
P21
P20
P19
N
BLACK
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
A B C D
Drain Clog Sensor
Bin T-Stat
Clean Switch
Normal operation – Stage 5
As the compressor comes up to normal running speed, its start winding generates a voltage potential across the
relay’s coil. This energizes the coil to open the contact and drop out the start capacitor.
The ice machine is now in a normal ice making mode. The ice machine will produce ice until the bin level control
in the ice dispenser is satised.
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
Capacitor
YELLOW
NO CONNECT
OR
BLACK
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
Drain
Valve
Fill
Valve
N
L1
RED
BROWN
BLACK
BLUE
L1
P22
AUGER
P6
P21
P20
P19
P3
N
BLACK
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
A B C D
Clean Switch
Water Sensors
Drain Clog Sensor
Bin T-Stat
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 17
Page 18
Normal operation – Stage 6
Once the bin thermostat control opens, the LOW BIN LED goes out. The compressor and gear motor outputs turn
off, the MAKING ICE LED goes out and the TIME DELAY LED comes on. .
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
Capacitor
YELLOW
NO CONNECT
BLACK
OR
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
Drain
Valve
Fill
Valve
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
P6
P21
P20
P19
P3
P22
N
BLACK
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
A B C D
Clean Switch
Water Sensors
Drain Clog Sensor
Bin T-Stat
Normal operation – Stage 7
The fan motor continues for 10 minutes before shutting off. The TIME DELAY LED remains on for 20 minutes.
The ice machine will not start while the TIME DELAY LED is on. To restart the ice machine for troubleshooting
purposes, depress the reset button to clear the control board.
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
Capacitor
YELLOW
NO CONNECT
BLACK
OR
Start
Relay
3
R
4
2
BLACK YELLOW
S
C
Gearmotor
Drain
Valve
Fill
Valve
N
L1
L1
RED
BROWN
BLACK
BLUE
AUGER
A B C D
Bin T-Stat
Water Sensors
Drain Clog Sensor
18 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
P6
P21
P20
P19
P3
P22
N
BLACK
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
COMPRESSOR
Clean Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
Page 19
Normal operation – Stage 8
When the dwell time of 20 minutes has expired, the TIME DELAY LED goes off. If 5 seconds of ice has been
dispensed and the SLEEP CYCLE LED (Symphony Plus only) is off, the ice machine will go through the normal
start-up sequence when the bin level control signals the control board for ice.
Capacitor
YELLOW
NO CONNECT
BLACK
OR
T.O.L.
RED
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
R
S
C
Compressor
Start
Relay
WHITE
Drain
Valve
Drain Clog Sensor
Run
2
5
Compressor
Electrical Box
Fill
Valve
Start
1
Bin T-Stat
Fan
WHITE
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
Ice Dispense Input
N
BLACK
P6
P21
P20
P19
P3
P22
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
WATER LEVELS
BIN
Pressure
Switch
COMPRESSOR
P11
Clean Switch
High
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
Quiet Night/Sleep cycle (Symphony Plus only)
The board monitors ice dispensing through a line voltage input to P15. If the ice dispense has not be initiated for
more than 5 seconds during the 20 minute time delay, the SLEEP CYCLE LED comes on. The machine will stay
off for 12 hours unless 5 seconds of dispensing is seen. After 12 hours, the SLEEP CYCLE LED goes out and the
ice making will resume if the bin thermostat is closed. The sleep cycle dispense duration is adjustable using the
DIP switches on the control board.
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 19
Page 20
Self-ushing (when enabled)
Water Sensors
At the completion of the 20 minute time delay, the machine checks for a cumulative one hour of ice making time
since the last off-cycle ush. If the cumulative ice making time exceeds one hour, the machine will energize the
drain valve P19 for 60 seconds to drain the evaporator. It will then rell with water, ush again, rell and begin
making ice if the LOW BIN LED is on. If the ice making time is less than 1 hour, the machine will start and begin
making ice without draining the evaporator.
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
Capacitor
YELLOW
NO CONNECT
BLACK
OR
Start
Relay
3
R
C
A B C D
4
2
BLACK YELLOW
S
Gearmotor
Drain
Valve
Fill
Valve
Drain Clog Sensor
Bin T-Stat
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
P6
P21
P20
P19
P3
P22
N
BLACK
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
Clean Switch
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
Diagnostic Stages
High gearmotor amps – Stage 1
The HI AMPS error and TIME DELAY LEDs are on indicating that the control board has sensed an over-torque
condition at the P4 terminal (more than 3 amps from the gearmotor) or no current draw (0A) and shut the ice
machine down (strike one). The HI AMPS and TIME DELAY LEDs will remain on for 60 minutes after an over-
torque condition has occurred. The ice machine will remain off as long as these two LEDs are on. After the
60 minute time delay, these LED lights turn off, and the control board will try to go through a normal start-up
sequence.
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
Capacitor
YELLOW
NO CONNECT
BLACK
OR
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
Drain
Valve
Fill
Valve
Drain Clog Sensor
Bin T-Stat
N
L1
L1
RED
BROWN
BLACK
BLUE
AUGER
20 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
P6
P21
P20
P19
P3
P22
N
BLACK
WATER LEVELS
P4
P15
HI PRS
BIN
1 2 3 4 5 6 7 8
RESET
P11
Clean Switch
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
Page 21
High gearmotor amps – Stage 2
If the restart is successful the board will continue to monitor the current draw on P4 for 60 minutes looking for
a second high amps (above 3A) occurrence. If the ice machine runs without problems for 60 minutes and no
additional torque errors occur, the ice machine will continue normal operation.
Capacitor
YELLOW
NO CONNECT
BLACK
OR
Start
Relay
T.O.L.
RED
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
R
S
C
Compressor
Start
Relay
WHITE
Drain
Valve
Run
2
5
Compressor
Electrical Box
Fill
Valve
Start
1
Fan
WHITE
N
L1
RED
BROWN
BLACK
BLUE
AUGER
L1
P6
P21
P20
P19
P3
P22
Ice Dispense Input
N
P15
BLACK
HI PRS
WATER LEVELS
P4
1 2 3 4 5 6 7 8
RESET
BIN
COMPRESSOR
P11
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
A B C D
Clean Switch
Water Sensors
Drain Clog Sensor
Bin T-Stat
High gearmotor amps – Stage 3
If a second occurrence happens during the 60 minute monitoring period, the HI AMPS LED will come on again
and shut the machine down (strike two). The HI AMPS LED (wihout the TIME DELAY LED) will indicate to the
technician that two consecutive over-torque situations have occurred. The ice machine is shut down at this time
and locked out. It will not restart unless the manual reset button is depressed while power is on.
Capacitor
YELLOW
NO CONNECT
BLACK
OR
T.O.L.
RED
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
R
S
C
Compressor
Start
Relay
WHITE
Drain
Valve
Drain Clog Sensor
Run
2
5
Compressor
Electrical Box
Fill
Valve
1
Start
Bin T-Stat
Fan
WHITE
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
Ice Dispense Input
N
BLACK
P6
P21
P20
P19
P3
WATER LEVELS
P22
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
High
Pressure
Switch
COMPRESSOR
Clean Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 21
Page 22
Loss of water
During operation, the water level cycles between the normal low (D) and normal high (C) water probes - the ll
valve (P21) cycling on and off. If continuity is not detected between the common probe (B) and normal low (D)
within 10 seconds, the LOW WATER and TIME DELAY LEDs will come on and the machine will shut down for
the one hour time delay period. After the time delay, the ll valve will re-energize and wait for continuity between
the common probe and normal high before restarting. LOW WATER LED will remain ON until the water level is
satised.
T.O.L.
RED
R
S
C
Compressor
Start
Relay
WHITE
Run
2
5
Compressor
Electrical Box
Start
1
Fan
WHITE
Ice Dispense Input
High
Pressure
Switch
Capacitor
YELLOW
NO CONNECT
BLACK
OR
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
Drain
Valve
Fill
Valve
Drain Clog Sensor
Bin T-Stat
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
P6
P21
P20
P19
P3
P22
N
BLACK
WATER LEVELS
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
Clean Switch
POWER
LOW BIN
MAKING ICE
COMPRESSOR
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
22 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 23
High refrigerant pressure
Should the refrigeration pressure rise above 425 psi, the high pressure switch contacts will open. The board sees
the open circuit and the HIGH PRESSURE and TIME DELAY LEDs will come on, the machine shuts down. After
the one hour time delay, the machine will attempt to restart. If the pressure has fallen below the reset point of 295
psi and the board see the contacts closed, the machine will resume normal operation. If the contacts are still open
after the restart, the board will again go into HIGH PRESSURE and TIME DELAY, cycling until contact closure is
seen.
Capacitor
YELLOW
NO CONNECT
BLACK
OR
T.O.L.
RED
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
R
S
C
Compressor
Start
Relay
WHITE
Drain
Valve
Drain Clog Sensor
Run
2
5
Compressor
Electrical Box
Fill
Valve
Start
1
Bin T-Stat
Fan
WHITE
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
Ice Dispense Input
N
BLACK
P6
P21
P20
P19
P3
P22
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
WATER LEVELS
BIN
Pressure
Switch
COMPRESSOR
P11
Clean Switch
High
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
Drain clog
If continuity is seen between the two drain clog sensor probes, the DRAIN CLOG LED will come on and the
machine will shut down. The machine will not restart unless the manual reset button is depressed while power is
on.
Capacitor
YELLOW
NO CONNECT
BLACK
OR
T.O.L.
RED
Start
Relay
4
2
3
BLACK YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
R
S
C
Compressor
Start
Relay
WHITE
Drain
Valve
Drain Clog Sensor
Run
2
5
Compressor
Electrical Box
Fill
Valve
Start
1
Bin T-Stat
Fan
WHITE
N
L1
RED
BROWN
BLACK
BLUE
L1
AUGER
Ice Dispense Input
N
BLACK
P6
P21
P20
P19
P3
WATER LEVELS
P22
P4
P15
HI PRS
1 2 3 4 5 6 7 8
RESET
P11
BIN
High
Pressure
Switch
COMPRESSOR
Clean Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
CLEANER FULL
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 23
Page 24
Refrigeration system (all models)
All service on refrigeration systems must be performed in accordance with all federal, state and local laws. It is the
responsibility of the technician to ensure that these requirements are met. Recharging ice machine to other than
factory specications will void the warranty.
R404A ice machine charge specications
Model Charge Refrigerant type
MCD425A, MFD425A, R425A, P425A (air-cooled) 15 oz. (425 g) R404A
MCD425W, MFD425W, R425W, P425W (water-cooled) 9 oz. (255 g) R404A
Refrigerant replacement requirements
1. Non-contaminated refrigerant removed from any Follett refrigeration system can be recycled and returned
to the same system after completing repairs. Recycled refrigerant must be stored in a clean, approved
storage container. If additional refrigerant is required, virgin or reclaimed refrigerant that meets ARI
standard 700-88 must be used.
2. In the event of system contamination (for example, a compressor burn out, refrigerant leak, presence of
non-condensibles or moisture), the system must be repaired, evacuated and recharged using virgin or
reclaimed refrigerant that meets ARI standard 700-88.
3. Follett Corporation does not approve of recovered refrigerants. Improper refrigeration servicing
procedures will void the factory warranty.
Evacuation
Evacuate the system to a level of 500 microns. When the 500 micron level is reached, close valves and both
manifold and shut down the vacuum pump. Allow the system to sit for approximately 20 minutes. During this period
the system pressure should not rise. If the system pressure rises and stabilizes there is moisture in the system and
further evacuation is needed. If the pressure continues to rise check the system for leaks.
Ice capacity test
Ice machine production capacity can only be determined by weighing ice produced in a specic time period.
Replace all panels on ice machine.
1. Run ice machine for at least 15 minutes.
2. Weigh and record weight of container used to catch ice.
3. Catch ice for 15 or 20 minutes.
4. Weigh harvested ice and record total weight.
5. Subtract weight of container from total weight.
6. Convert fractions of pounds to decimal equivalents (ex. 6 lb 8 oz. = 6.5 lb).
7. Calculate production using following formula:
1440 min. x wt. of ice produced
= Production capacity/24 hr. period
Total test time in minutes
8. Calculated amount per 24 hours should be checked against rated capacity for same ambient and water
temperatures in Ice Production Tables.
24 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 25
Evaporator disassembly
Note: The upper bearing, lower bearing and auger assemblies must be replaced as assemblies. The bottom and
top bearing assemblies cannot be eld assembled to factory specications.
1. Press CLEAN switch.
2. Wait for LOW WATER light to illuminate.
3. Turn OFF power.
4. Remove top bearing insulation and
compression nozzle insulation.
5. Disconnect vent and drain tube from nozzle.
6. Disconnect compression nozzle from
evaporator.
7. Disconnect evaporator water feed line.
8. Remove nut and upper v-band coupling from
top of evaporator.
9. Lift top bearing assembly straight up with a
slight rotating motion and remove.
10. Remove ice compression loop located at top of
auger.
11. Lift auger straight up and out of evaporator.
12. Remove nut and lower vee band coupling from
bottom of evaporator.
13. Lift evaporator to clear bottom bearing
assembly.
14. Loosen hex head bolt in side of mounting
base with 5/16 wrench and lift lower bearing
assembly.
15. Remove condensate shield.
16. Remove 4 Allen head machine screws holding
mounting base to gearbox.
Fig. 3
FLAKER COMPONENTS
COMPRESSION
LOOP 00124115
AUGER 00124123
Evaporator reassembly
1. Clean gearmotor boss, output shaft and shaft
well.
Fig. 4
Apply grease in well
2. Install drain pan and evaporator mounting
base.
3. Fill gear motor shaft well with food grade
grease (Fig. 4).
4. Install condensate shield and seat against
gear motor boss.
Evaporator drain pan and mounting base not shown for clarity.
5. Install bearing O ring in groove in evaporator
mounting base.
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 25
Page 26
6. Lower bottom bearing assembly into
evaporator mounting base.
7. While maintaining rm downward pressure
on bottom bearing assembly, tighten hex
head bolt with a 5/16 wrench.
8. Position evaporator over lower bearing
assembly and align grooves with pins in
bearing assembly.
9. Install vee band clamp and nut to 70 in/lb.
(Fig. 5).
Note: Clamp must be oriented as shown
in order for the insulation to be placed
properly.
10. Place auger in center of evaporator and
rotate to mate with drive pin.
11. Install ice compression loop, orienting loop.
12. Install upper bearing and seal assembly,
rotating bearing to slip pin into auger slot.
13. Install upper vee band clamp and nut to
70in/lb.
14. Install evaporator insulation.
15. Install compression nozzle and tubing.
16. Secure ice transport tube with clamp
(Fig.6.1).
Note: Clamp must be oriented as shown
in order for the insulation to be placed
properly.
Fig. 5
Fig. 6
2
4
3
1 7. Install compression nozzle insulation
(Fig.6.2).
18. Install vent and drain tube (Fig.6.3).
19. Install top bearing insulation (Fig.6.4).
Gearmotor replacement
1. Disassemble evaporator.
2. Disconnect the wire connectors.
3. Remove 4 screws holding gear motor
mounting plate to base of ice machine and
lift gearbox and motor clear of ice machine.
4. Remove machine screws holding mounting
plate to motor.
5. Install new motor in reverse order.
3
1
26 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 27
Replacement parts
Replacement ice machine ordering matrix
Dispenser models Replacement ice machine model
Dispensers with top mounted ice machines
50CT425A & 50HT425A P425A
50HT425W & 50HT425W P425W
25CT 425A & 25HT425A P425A
25CT425W & 25HT425W P425W
110CT425A P425A
110CT425W P425W
Dispensers with remote ice machines
25CR425A & 25HR425A R425A
25CR425W & 25HR425W R425W
50CR425A & 50HR425A R425A
50CR425W & 50HR425W R425W
110CR425A R425A
110CR425W R425W
All U150/VU155 series with air-cooled ice machines MCD425AVS
All U150/VU155 series with water-cooled ice machines MCD425W
All VU300 series with air-cooled ice machines MCD425A
All VU300 series with water-cooled ice machines MCD425W
Freestanding dispensers with ice machines in the base
25FB425A P425A
25FB425W P425W
50FB425A P425A
50FB425W P425W
110FB425A P425A
110FB425W P425W
Nugget ice machine on top of bin
MCD425ABT MCD425ABT*
MCD425WBT MCD425WBT*
Flake ice machine on top of bin
MFD425ABT MFD425ABT*
MFD425WBT MFD425WBT*
* New bin top required.
Ice machine cleaner/descaler
00132001 SafeCLEAN environmentally-friendly cleaner, carton of 24 x 7 oz packets
Ice machine sanitizer
00979674 Nu-Calgon IMS-II or IMS-III Sanitizer, 16 oz. bottle
00131524 Sponge, sanitary, each
Miscellaneous
Part # Description
501860 Condensate pump
502775 Oil, gearmotor, 1 pint
501111 Grease, Mobile FM 222, 14 oz tube
500377 Clamp, ice tube
501425 Grille
01075431 Sponge, sanitary, pack of 24
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 27
Page 28
Air-cooled skins assembly (MCD425A_S, R425A)
7
6
8
2
1
Reference # Description Part #
1 Gasket, duct 502781
2 Duct (including gasket) 01068188
3 Front panel 01068204
4 Spacer, base 01068220
5 Panel, right side 01068238
6 Panel, left side and rear (1 piece) 01068246
7 Bushing 01026152
8 Panel, top 01068253
9 Tube, drain 01016948
10 Fitting, water 01065375
11 Fitting, drain 00109728
3
4
10
11
9
5
28 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 29
Water-cooled skins assembly (MCD425W_S, R425W)
9
8
10
4
1
1
2
3
Reference # Description Part #
1 Fitting, condenser 00195966
2 Fitting, water 01065375
3 Fitting, drain 00109728
4 Panel, front 01068261
5 Spacer, base 01068220
6 Panel, right side 01068238
7 Tube, drain 01016948
8 Panel, left side and rear (1 piece) 01068246
9 Bushing 01026152
10 Panel, top 01068253
5
7
6
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 29
Page 30
Louvered docking station (MCD425A/W_T)
4
3
2
1
Reference # Description Part #
1 Louver, front 01006154
2 Cover, front 01068279
3 Tube, drain 01055185
4 Lovered docking station 01068287
30 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 31
Electrical components
1
3
4
Reference # Description Part #
1 Capacitor, run 00997759
2 Relay start, compressor, 115 V, 60 Hz 00997726
3 Board, control circuit, 115 V, 60 Hz 01064708
4 Switch, clean 00117036
Not shown Bin thermostat (MCD425A/WBT, MCD425A/WHT, MFD425A/WBT and
MFD425A/WHT only)
Not shown Board, stand off control (8 required) 00903005
Not shown Relay, power to contact closure 01020734
Not shown Jumper, bin signal 01069095
Not shown Cord and plug, power 01075589
Not shown Converter, bin signal, Vision 01067156
Not shown Relay, bin signal (power to contact closure) 01020734
2
500514
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 31
Page 32
Evaporator
FOOD SERVICE
23
HEALTHCARE
15
17
17
18
25
19
30
27
2
24
FLAKER
1
3
4
5
COMPONENTS
3
4
26
20
1
FLAKER
32
28
18
12
21
22
7
6
8
10
11
16
9
13
31
29
13
32 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 33
Evaporator
Reference # Description Part #
1 Coupling, vee band, includes nut 502735
2 Bearing assembly, top 502736
3 Loop, ice compression, beveled (see below for Flaker-specic components) 502110
4 Auger (see below for Flaker-specic components) 502737
5 Evaporator (includes insulation jacket, 502740) 01064658
6 O ring, bearing housing 500496
7 Bearing assembly, bottom (includes O rings and condensate shield) 502738
8 O ring, mounting base 501063
9 Shield, condensate 500744
10 Screw, Allen 1/4 20 x 1/2 (set of 4) 501080
11 Mounting base, evap. (includes 501063) 502733
12 Bolt, mounting base 502227
13 Gearbox and motor 502730
Not shown Mounting base, gearbox 01067693
15 Compression nozzle, with single drain 01064674
16 Drain pan, evaporator 00181990
17 Tube, compression nozzle vent 01027804
18 Tube, compression nozzle, single drain 01027416
Not shown Grease, Chevron SRI-2, 14 oz 501111
19 Bracket, vent hoses 01007087
20 Insulation jacket, evaporator 01049592
21 Relay, gearmotor (for split-phase motor only) 00142042
22 Cover, black plastic 01012228
23 Nozzle, compression, dual drain 01067446
24 O ring, top bearing 01064963
25 Tube, compression nozzle, dual drain 01033778
26 Sensor, overow 01039783
27 Insulation, top bearing 01049600
28 Insulation, compression nozzle, single drain 01049584
29 16 µF Capacitor (for PSC motor only) 01103142
30 Screw, compression nozzle 00956250
31 Cover, aluminum 01106376
Not shown O-ring, compression nozzle 00988097
Flaker-specic components
Reference # Description Part #
3 Loop, compression, notched 00124115
4 Auger (with paddle) 00124123
18 Tube, compression nozzle, single drain 01027416
32 Compression nozzle, aker 01067453
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 33
Page 34
Air-cooled ice machines
9
23
22
16
25
11
1
5
13
2
18
14
15
7
19
12
4
24
21
6
8
10
17
34 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
20
3
Page 35
Air-cooled ice machines
Reference # Description Part #
1 Drier 502724
2 Condenser coil, A/C 01067461
3 Reservoir mounting bracket, a/c 01072909
4 Reservoir assembly 01064682
5 Bracket, electrical box 01068170
6 Evaporator (see page 32 and 33 for complete breakdown) —
Not shown Tubing, polypropylene, reservoir supply (sold by foot) 502079
7 Valve, expansion, thermal 502726
8 Drain pan, evaporator 0018190
9 High pressure cutout 502732
10 Mounting bracket, gearbox 01067693
11 Gearbox & motor assembly, 115 V, 60 Hz 502730
12 Tubing, clean and vent 00998765
13 Fan blade 500474
14 Motor, fan, 115 V, 60 Hz 500672
15 Bracket, fan motor 01067107
Not shown Overload, compressor, 115 V, 60 Hz 01027572
16 Compressor, 115 V, 60 Hz 01065259
17 Tube, ll/purge - reservoir-solenoid-evaporator feed 01051192
Not shown Water inlet tting, brass 01065275
Not shown Fitting, reservoir, plastic 1/4" stem x 1/4" push-in 00121699
18 Jacket, insulation, TXV 502830
19 Bracket, ice tube entry 01067644
20 Solenoid, purge 00991216
21 Solenoid, ll 01082403
Not shown Tube, drain, MCD425AxT 01055185
Not shown Tube, drain, MCD425AxS 01016948
22 Tube, ice transport, MCD425A/WxT 01003532
23 Jacket, insulation, TXV bulb 00106534
24 Cup, cleaning 01065226
Not shown Gasket, reservoir 00990978
25 Capacitor, start 01026145
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 35
Page 36
Water-cooled ice machines
23
15
7
11
16
16
13
6
4
18
1
25
22
21
5
9
8
10
17
19
3
4
20
2
24
14
36 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 37
Water-cooled ice machines
Reference # Description Part #
1 Drier 502724
2 Valve, water regulating (includes Iso-washer) 500537
Not shown Iso-washer (for water regulating valve) 501810
3 Reservoir assembly 01064682
4 Reservoir mounting bracket 01068162
Not shown Tubing, polypropylene, reservoir supply (sold by foot) 502079
Not shown Fitting, reservoir, plastic 1/4" stem x 1/4" push-in 00121699
5 Evaporator (see page 32 and 33 for complete breakdown) —
6 Bracket, electrical box tower 01068121
7 Valve, expansion, thermal 502726
8 Drain pan, evaporator 00181990
9 Gearbox & motor assembly, 115 V, 60 Hz 502730
10 Mounting bracket, gearbox 01067693
11 Bracket, electrical box mounting 01068139
Not shown Overload compressor, 115 V, 60 Hz 01027572
12 Compressor, 115 V, 60 Hz 01065259
13 Coil, condenser 00195933
14 Tube, clean and vent 00998765
Not shown Water inlet tting, brass 01065275
15 High pressure cutout 502732
16 Ty-rap (2 required) 204584
17 Tube, ll/purge - reservoir-solenoid-evaporator feed 01051192
18 Bracket, ice tube entry 01067644
19 Solenoid, purge 00991216
20 Solenoid, ll 01082403
Not shown Tube, drain, 25/50CI 01054576
Not shown Tube, drain, MCD425AxT 01055185
Not shown Tube, drain, MCD425AxS 01016948
21 Tube, ice transport, MCD425A/WxT 01003532
22 Jacket, insulation, TXV 502830
23 Jacket, insulation, TXV bulb 00106534
24 Cup, cleaning 01065226
Not shown Bracket, ll solenoid 01072867
Not shown Gasket, reservoir 00990978
25 Capacitor, start 01026145
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 37
Page 38
Water treatment accessories for Symphony ice and water dispensers
Reference # Description Part #
Standard capacity lter system
Not shown Follett QC4-FL4S water lter system (includes FL4S primary cartridge and head, coarse
pre-lter and head, pressure gauge, ushing valve; assembled and installed on mounting
bracket), one per ice machine
Not shown Follett FL4S primary replacement cartridge 00130245
Not shown Water lter cartridge – primary, carton of 6 00954297
Not shown Everpure coarse pre-lter cartridge 00130211
Not shown Water pre-lter cartridge – pre-lter, carton of 12 00954305
High capacity lter system
Not shown High capacity water lter system (one per ice machine) 00978957
Not shown High capacity water lter cartridge – primary, single 00978965
Not shown High capacity water lter cartridge – primary, carton of 6 00978973
Not shown Water pre-lter cartridge – pre-lter, single 00130211
Not shown Water pre-lter cartridge – pre-lter, carton of 12 00954305
Carbonless high capacity lter system
Not shown Carbonless high capacity water lter system (one per ice machine) – Horizon™ and Mae-
stroPlus series ice machines
Not shown Carbonless high capacity water lter cartridge – primary, single 01050426
Not shown Carbonless high capacity water lter cartridge – primary, carton of 6 01050434
Not shown Water pre-lter cartridge – pre-lter, single 00130211
Not shown Water pre-lter cartridge – pre-lter, carton of 12 00954305
Other ltration
Not shown Claris hardness removal ltration system 00986059
Not shown Replacement lter for Claris system 00985127
Not shown Reverse osmosis system, 200 gallons per day 00986034
Not shown Replacement reverse osmosis cartridge 00985085
Not shown Replacement reverse osmosis pre-lter 00985077
Not shown Cleaning plug for reverse osmosis system 00985119
Not shown Cleaning cartridge for reverse osmosis system 00985101
Water pressure
Not shown Water pressure regulator (25 psi) 501781
00130229
01050442
Miscellaneous
Reference # Description Part #
Not shown Diverter plate (single agitator Cornelius dispensers and left-hand
307277
dispense chute on dual-agitator Cornelius dispensers)
Not shown Diverter plate (right-hand dispense chute on dual-agitator dispensers) 00996207
Not shown Diverter plate, Cornelius Flavor Fusion 01100825
38 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Page 39
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines 39
Page 40
SafeCLEAN, SensorSAFE, Maestro Plus, Symphony Plus, Quiet Night and Sani-Sponge are trademarks of Follett Corporation.
Follett and RIDE are registered trademarks of Follett Corporation, registered in US.
801 Church Lane • Easton, PA 18040, USA
Toll free (877) 612-5086 • +1 (610) 252-7301
www.follettice.com
© Follett Corporation 12/15
01033646R03
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