Follett MCE425A/W T Operation And Service Manual

MCC425A/W_S

MCE425A/W_S

ER425A/W

MCC425A/W_T

MCE425A/W_T

MFC425A/W_T

MFE425A/W_T

CP425A/W

EP425A/W

01083856R01

801 Church Lane • Easton, PA 18040, USA

Toll free (877) 612-5086 • +1 (610) 252-7301

www.follettice.com

Operation and Service Manual

MC_425A/W, MF_425A/W, _P425A/W

Ice Machines - 230 V 50 Hz, 220 V 60 Hz

Following installation, please forward this manual

totheappropriate operations person.

2 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

CAUTION!

§ Do not tilt any unit further than 30° off vertical during uncrating or installation.

§ Dispenser bin area contains mechanical, moving parts. Keep hands and arms clear of this area at all times. If

access to this area is required, power to unit must be disconnected rst.

§ This appliance is not suitable for installation in an area where a water jet could be used.

§ This appliance must not be cleaned by a water jet.

§ User maintence should not be done by children without supervision.

§ 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).

§ Prior to operation clean and sanitize the dispenser in accordance with instructions found in this manual.

§ Do not block right side air intake or top air exhaust.

§ This appliance should be permanently connected by a qualied person in accordance with application codes.

§ A qualied person shall provide a readily accessible disconnect device incorporated into the xed wiring.

§ If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualied

persons in order to avoid a hazard.

§ Connect to potable water supply only.

§ This appliance can be used by children aged 8 years and above and persons with reduced physical, sensory,

or mental capabilities, or lack of experience and knowledge if they have been given supervision or instruction

concerning use of the appliance in a safe way and understand the hazards involved. Children should be

supervised to ensure that they do not play with the appliance.

§ This appliance is intended to be used for household and similar applications such as staff kitchen areas

in shops, offices and other working environments; farm houses and by clients in hotels, motels and other

residential type environments; bed and breakfast type environments; catering and similar non-retail

applications.

§ WARNING! To avoid a hazard due to instability of the appliance, it must be xed in accordance with the

instructions.

§ Warranty does not cover exterior or outside installations.

§ To reduce risk of shock, disconnect power before servicing.

§ 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.

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 3

4 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

Contents

Welcome to Follett. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Before you begin ............................................................................ 5

Specications .............................................................................. 6

Electrical ................................................................................ 6

Plumbing ................................................................................ 6

Ambient ................................................................................. 6

Water usage (water-cooled condenser only) .................................................... 6

Dimensions and clearances ................................................................. 7

Operation .................................................................................. 8

Cleaning/descaling and sanitizing ............................................................ 8

Weekly ................................................................................. 8

Monthly ................................................................................. 8

Semi-Annually (more often if conditions dictate) ................................................. 8

Service ................................................................................... 10

Ice machine Operation (all models) .......................................................... 10

Water system ............................................................................11

Electrical system ......................................................................... 12

Technical specications (all models) ......................................................... 14

Electrical control system schematic - 230 V 50 Hz .............................................. 16

Electrical control system schematic - 220 V 60 Hz .............................................. 17

Electrical control system operation ........................................................... 17

Refrigeration system (all models) ............................................................ 27

Replacement parts ......................................................................... 30

Replacement ice machine ordering matrix ..................................................... 30

Air-cooled skins assembly (MCE425A_S) ..................................................... 31

Water-cooled skins assembly (MCE425W_S) .................................................. 32

Louvered docking station (MCE425A/W_T) .................................................... 33

Evaporator ............................................................................. 34

Air-cooled ice machines - 230 V 50 Hz ....................................................... 36

Air-cooled ice machines - 220 V 60 Hz ....................................................... 38

Water-cooled ice machines - 230 V 50 Hz ..................................................... 40

Water-cooled ice machines - 220 V 60 Hz ..................................................... 42

Electrical components .................................................................... 44

Welcome to Follett

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 LLC 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.

MCE425ABT

Application

V – Vision

B – Bin

H – Harmony

J – Drop-in

Configuration

T – top-mount

Ice machine capacity and refrigerant

400 – 425 lbs (193 kg)/day, R404A

Ice machine series

Maestro

Voltage

E – 230 V 50 Hz

C - 220 V 60 Hz

Condenser type

A – air-cooled

W – water-cooled

Ice machine type

C – Chewblet ice

M - MicroChewblet ice

F - Flake ice

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 5

Specications

Electrical

§ Each ice machine and dispenser require a separate circuit with electrical disconnect within 10 ft (6 m).

§ Equipment ground required.

§ Standard electrical – 230 V, 50 Hz, 1 phase or 220 V, 60 Hz, 1 phase

§ Connect to a dedicated circuit.

§ Maximum ice machine amperage – 5.5A.

§ Cord 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

temperature

90 F/32.2 C max. 45 F/7.2 C min

Condenser water

pressure

125 psi (862 kPA) max. 10 psi (68 kPA) min.

*

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 (0.95 L/m)@ 50 F (10 C)

§ 0.5 gpm (1.90 L/m)@ 70 F (21 C)

§ 1.25 gpm (4.73 L/m)@ 90 F (32 C)

6 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

Side view — air-cooled and water-cooled

20.75" (52.7 cm)

22.75" (57.8 cm)

17.00"

(43.2 cm)

RIDE model air-cooled units only

Front view — top mount

MCE425A/W_T

MFE425A/W_T

MCE425A/W_S

ER425A/W

Side view — top mount

22.49" (57.1 cm)

21.29" (54.1 cm)

22.69" (57.6 cm)

22.46" (57.1 cm)

Back view — top mount

A

B

D

E

C

Front view — water-cooled

CONDENSER

OUTLET

10.62" (27.0 cm)

8.25" (20.9 cm)

4.81"

(12.0 cm)

2.31"

(5.7 cm)

5.25"

(13.3 cm)

C

F

E

D

A

B

Front view — air-cooled

4.81"

(12.0 cm)

2.31" (5.7 cm)

2.5" (6.4 cm)

C

F

A

B

18.88" (48 cm)

2.32"

(5.9 cm)

4.40" (11.2 cm)

15.22" (38.7 cm)

11.03" (28.0 cm)

8.03" (20.4 cm)

5.03" (12.8 cm)

2.34" (6 cm)

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.

§ MCE425A & ER425A – 18" (45.7 cm) minimum, 10 ft (3 m) maximum clearance between discharge and air

intake grilles.

A – 3/4" MPT drain

B – 3/8" FPT water inlet

C – Electrical cord

D – 3/8" FPT condenser inlet

E – 3/8" FPT condenser drain

F – Bin signal connection (DO NOT APPLY VOLTAGE!)

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 7

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 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 Plus™ (P/N 01050863 - 24 packets)

8 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

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 Solution A or Solution B 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.

SafeCLEAN Plus 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 Plus ice machine cleaner/descaler and sanitizer.

Cleaning/descaling and Sanitizing 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

SafeCLEAN Plus

solution completely lls the

reservoir. Place lid back on cup.

6. CLEANER FULL light will turn on and machine will start cleaning and sanitizing cycle then rinse three

times; this process takes approximately 15 minutes.

7. When machine is nished cleaning and sanitizing, the MAINTENANCE light will turn off.

8. Loosen phillips-head screw on nozzle connected to evaporator. Remove nozzle from evaporator side only,

leave other side of nozzle connected to transport tube.

9. Place one Sani-Sponge in remaining

SafeCLEAN Plus

solution.

10. Insert the sponge soaked in

SafeCLEAN Plus

solution into nozzle then insert a dry sponge into the nozzle.

11. Replace nozzle onto evaporator and tighten screw. Ensure drain is connected to reservoir and vent tubes

are connected to evaporator drain pan.

12. Reconnect bin signal cable. Wait for ice to push sponges through transport tube.

13. Collect sponges from ice storage bin.

14. Replace front or top cover.

15. After 10 minutes, dispense all ice and discard.

16. Clean/descale and sanitize dispenser/bin.

Exterior Cabinet

§ Clean stainless steel panels with stainless steel cleaner.

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 9

Service

Ice machine Operation (all models)

Follett’s ice machine consists of four distinct functional systems:

§ Harvesting system

§ Refrigeration system

§ Water system

§ Electrical control 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 (10RPM) 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

auger

compression nozzle

ice transport tube

evaporator

port

10 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

Water system

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

CLEANING CUP

WATER SUPPLY

3/8" FPT, 45-90 F (7-32 C)

10-70 PSI (69-483 KPA)

RESERVOIR FILL

SOLENOID

WASTE WATER DRAIN

3/4" FPT

WATER

RESERVOIR

EVAPORATOR

ICE

NOZZLE

DRAIN PAN

VENT

DRAIN

Fig. 2 Water level diagram

B

A

C

D

NORMAL OPERATING RANGE

A ALARM LOW (RED)

B COMMON (BLACK)

C NORMAL HIGH (ORANGE)

D NORMAL LOW (YELLOW)

B

A

B

A

C

D

C

D

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 11

12 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

Electrical system

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

FLASHINGON or OFF

Legend:

OFFON

1. Ice machine is making ice. 1. Normal running.

2. Ice machine is not making ice.

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.

DIP Switch Settings

Sleep cycle dispense duration

OFF ON

1 2 3 4 5 6 7 8

4 5 4 5

35 s

15 s

5 s

60 s

OFF POSITION ON POSITION

Sleep cycle

enabled

Not used

Sleep cycle

dispense duration

60 min. time delay

Flush enabled*

Maint. timer OFF

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

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

MCE425A/W_T, MCE425A/W_S, ER425A/W

Replacement EP425A/W installed in Symphony dispenser

Sleep cycle

enabled

Not used

Sleep cycle

dispense duration

60 min. time delay

Flush enabled

Maint. timer OFF

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

425A/W installed in Symphony Plus

25/50/110 CI, CT, or FB

* 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.

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 13

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 rell with water, ush again and rell,

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 1.8A 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.

14 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

Technical specications (all models)

Refrigeration system diagram

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 pressure data

§ Water regulating valve is factory set at 300 ±10 PSIG (2068.4 ± 69 kPA) head pressure.

§ Readings within 10% of table values should be considered normal.

Compressor data

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

220 V 230 V 220 V 230 V 220 V 230 V 220 V 230 V 220 V 230 V

Amperage 2.65 2.25 2.77 2.36 2.89 2.46 3.01 2.57 3.13 2.68

High-side pressure (psi) 219 199 256 233 293 266 330 306 367 346

Low-side pressure (psi) 28 29 30 31 33 33 35 36 38 38

Water-cooled

Condenser water

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

220 V 230 V 220 V 230 V 220 V 230 V 220 V 230 V 220 V 230 V

Amperage 2.8 2.4 2.9 2.5 2.9 2.5 2.9 2.5 3.0 2.6

High-side pressure (psi) 290 290 291 291 292 292 292 293 293 294

Low-side pressure (psi) 31 32 31 32 32 33 32 34 33 34

Locked rotor amps 220 V: 19.6A 230 V: 18.2A

Condenser water usage: @70 F/70F: 0.26 gal/min @90 F/70F: 0.56 gal/min

Gearmotor data 220 V/60 Hz 230 V/50 Hz

Gearmotor current 1.0A (nominal) 1.3A (nominal)

Locked rotor amps 6.8A 6.8A

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 15

Air-Cooled ice machine capacity/24hrs. - 220 V/60 Hz

Ambient Air Temperature F/C

Inlet Water Temperature F/C

F 60 70 80 90 100

C 16 21 27 32 38

50 454 426 398 363 328 lbs.

10 205 193 181 165 149 kg.

60 437 408 379 346 314 lbs.

16 198 185 172 157 142 kg.

70 420 390 359 330 300 lbs.

21 191 177 163 150 136 kg.

80 401 374 348 319 290 lbs.

27 182 170 158 145 132 kg.

90 381 359 337 308 280 lbs.

32 173 163 153 140 127 kg.

Air-Cooled ice machine capacity/24hrs. - 230 V/50 Hz

Ambient Air Temperature F/C

Inlet Water 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.

32 179 166 152 138 125 kg.

Water-Cooled ice machine capacity/24hrs. -

220 V/60 Hz

Condenser Water Temperature F/C

Inlet Water Temperature F/C

F 60 70 80 90 100

C 16 21 27 32 38

50 454 442 431 419 408 lbs.

10 206 200 195 190 185 kg.

60 435 421 407 394 380 lbs.

16 197 191 185 179 172 kg.

70 416 400 384 368 351 lbs.

21 187 181 174 167 159 kg.

80 396 381 365 350 335 lbs.

27 180 173 166 159 152 kg.

90 375 361 346 332 318 lbs.

32 170 164 157 151 144 kg.

Water-Cooled ice machine capacity/24hrs. -

230 V/50 Hz

Condenser Water Temperature F/C

Inlet Water Temperature F/C

F 60 70 80 90 100

C 16 21 27 32 38

50 429 407 386 364 353 lbs.

10 195 185 175 165 160 kg.

60 409 389 370 350 331 lbs.

16 185 176 168 159 150 kg.

70 389 372 354 336 322 lbs.

21 176 169 161 152 146 kg.

80 370 353 337 320 304 lbs.

27 168 160 153 145 138 kg.

90 349 335 320 315 290 lbs.

32 158 152 145 143 132 kg.

Note: Nominal values - actual production may vary by ±10%.

16 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

Electrical control system schematic - 230 V 50 Hz

WATER LEVELS

P17

BIN

P12

CLEAN SAFE

P11

POWER

LOW BIN

MAKING ICE

SLEEP CYCLE

TIME DELAY

LOW WATER

MAINTENANCE

SERVICE

HI AMPS

HI PRESSURE

CLEANER FULL

RESERVOIR

WATER SENSOR

MAINT.

CLEAN

HI PRS

P14

HIGH

PRESS

P

A B C D

BLACK

YELLOW

ORANGE

RED

GRN #17

BLACK #51

BLACK #23

BIN

CONTACT

CLOSURE

L1

L2/N

DISP

GND

BLACK #23

GRN-YEL #24

WHITE #25

BLACK #26

WHITE

BLUE

START

RELAY

3

4

2

YELLOW

BLACK

T.O.L.

START

RUN

FAN

FEED VALVE

DRAIN VALVE

RED #16

WHITE #121

WHITE #13

BROWN #14

BLACK #122

BLUE #07

BLACK #51

WHITE #52

COMP.

R

C

S

O.L.

C2 START

1 2 3 4 5 6 7 8 9

GREEN #53

COMPRESSOR

ELECTRICAL

BOX

BLACK #51

WHITE #52

GREEN #53

RED #54

ORANGE #55

BLACK #56

GREEN #57

BLACK #58

BLACK #59

6

4

1

2

5

BLACK #61

WHITE #62

GREEN #63

WHITE #64

BLACK #65

BLACK #66

GREEN #67

BLACK #68

BLACK #69

C1 RUN

BLACK #66

BLACK #69

BLACK #71

#15

#04

#05

WHITE

DRAIN CLOG

SENSOR

BLACK

VIOLET

DRAIN CLOG

MODEL SELECT

SERIAL COMM

COMPRESSOR

AUGER

WATER LEVELS

HI PRS

BIN RS485

RS485 UI

CURRENT SENS

RESET

PROGRAM

P5

ICE AUX WATER AUX

D9

D8

D7

D6

D5

D4

D37

D3

D2

D18

D16

D15

D14

D13

D12

D11

D10

D1

T1

P18

P11

P13

P17

P12

P14

P16

P15

P4

T2

S1

S2

K1

P7

P8

P10

K3

1

2

6

5

P9

L1 L1L1

N N N N N N N N N

P2

P1

P21

P20

P19

P3

BLACK #01

P6

P22

D19D22D21D20

D17

D48

BLACK

Electrical control system schematic - 220 V 60 Hz

P17-WATER LEVELS

P12-BIN

P11-CLEAN SAFE

POWER

LOW BIN

MAKING ICE

SLEEP CYCLE

TIME DELAY

LOW WATER

MAINTENANCE

SERVICE

HI AMPS

HI PRESSURE

CLEANER FULL

RESERVOIR

WATER SENSOR

MAINT.

CLEAN

HIGH

PRESS

P

A B C D

BLACK

YELLOW

ORANGE

RED

GRN #17

BLACK #51

BLACK #23

BIN

CONTACT

CLOSURE

L1

L2/N

DISP

GND

BLACK #23

GRN-YEL #24

WHITE #25

BLACK #26

FAN

FEED

VALVE

DRAIN

VALVE

RED #16

WHITE #121

WHITE #13

BROWN #14

BLACK #122

BLUE #07

BLACK #51

WHITE #52

GRN / YEL #53

#15

#04

#05

WHITE

DRAIN CLOG

SENSOR

BLACK

VIOLET

DRAIN CLOG

MODEL SELECT

COMPRESSOR

P4-AUGER

P7-RS485 UI

RESET

PROGRAM

P5

D9

D8

D7

D6

D5

D4

D37

D3

D2

D18

D16

D15

D14

D13

D12

D11

D10

D1

T1

P18

P11

P13

P12-BIN

P14-HI PRS

P15

T2

S1

S2

K1

P8-RS485

K3

1

2

6

5

P9

L1

N N N N N N N N N

P2

P1

P21

P20

P19

P3

BLACK #01

P6

P22

D19

D22

D21

D20

D17

D48

BLACK

BLUE

SPLIT-PHASE MOTOR

START

RELAY

3

4

2

YEL

BLK

T.O.L.

START

RUN

WHITE

4

1

2

5

BLACK #51

WHITE #52

GRN / YEL #53

C2-START

BLACK

C1-RUN

BLUE

BROWN

VIOLET

GRN / YEL

COMPRESSOR

VIOLET

BLACK

GRN / YEL

GRAY

S

C

R

THERMAL

O.L.

P14-HI PRS

ICE

AUX

CURRENT

SENS

P17

WATER LEVELS

P10

SERIAL

COMM

JUNCTION

BOX

START

RELAY

GROUND TERMINALS

ON MOUNTING PLATE

Electrical control system operation

The wiring diagrams that follow illustrate the circuitry of these 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 (2930.3 kPA) and closes at 287 PSI (1978.8 kPA)(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).

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 17

Normal operation – Stage 1 - 230V 50 Hz

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.

5

2

1

Start

Run

Compressor

T.O.L.

MAINTENANCE

LOW WATER

TIME DELAY

SLEEP CYCLE

MAKING ICE

LOW BIN

POWER

SERVICE

HI AMPS

HI PRESSURE

DRAIN CLOG

CLEANER FULL

High

Pressure

Switch

R

S

C

Gearmotor

Start

Relay

Start

Relay

N

L1

Fan

A B C D

Water Sensors

RESET

Fill

Valve

Drain

Valve

3

4

2

Bin T-Stat

Clean Switch

Drain Clog Sensor

P6

P21

P20

P19

P3

P22

P4

AUGER

WATER LEVELS

BIN

P11

HI PRS

L1

R

S

C

RED

WHITE

BLACK

BROWN

BLUE

RED

BLACK YELLOW

Compressor

Electrical Box

COMPRESSOR

1 2 3 4 5 6 7 8

BLACK

N

P15

Ice Dispense Input

Normal operation – Stage 1 - 220 V 60 Hz

The 220 V 60 Hz is identical to the 230 V 50 Hz EXCEPT that the compressor output and neutral are reversed, as

shown in the diagram below. The remaining Stages show only the 230 V 50 Hz applications.

Start

Run

Compressor

MAINTENANCE

LOW WATER

TIME DELAY

SLEEP CYCLE

MAKING ICE

LOW BIN

POWER

SERVICE

HI AMPS

HI PRESSURE

DRAIN CLOG

CLEANER FULL

High

Pressure

Switch

R

S

C

Gearmotor

Start

Relay

Start

Relay

N

L1

Fan

A B C D

Water Sensors

RESET

Fill

Valve

Drain

Valve

3

4

2

Bin T-Stat

Clean Switch

Drain Clog Sensor

P6

P21

P20

P19

P3

P22

P4

AUGER

WATER LEVELS

BIN

P11

HI PRS

L1

RED

WHITE

BLACK

BROWN

BLUE

RED

BLACK YELLOW

Compressor

Electrical Box

COMPRESSOR

1 2 3 4 5 6 7 8

BLACK

N

P15

Ice Dispense Input

5

2

1

T.O.L.

R

S

C

18 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

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.

5

2

1

Start

Run

Compressor

T.O.L.

MAINTENANCE

LOW WATER

TIME DELAY

SLEEP CYCLE

MAKING ICE

LOW BIN

POWER

SERVICE

HI AMPS

HI PRESSURE

DRAIN CLOG

CLEANER FULL

High

Pressure

Switch

R

S

C

Gearmotor

Start

Relay

Start

Relay

N

L1

Fan

A B C D

Water Sensors

RESET

Fill

Valve

Drain

Valve

3

4

2

Bin T-Stat

Clean Switch

Drain Clog Sensor

P6

P21

P20

P19

P3

P22

P4

AUGER

WATER LEVELS

BIN

P11

HI PRS

L1

R

S

C

RED

WHITE

BLACK

BROWN

BLUE

RED

BLACK YELLOW

Compressor

Electrical Box

COMPRESSOR

1 2 3 4 5 6 7 8

BLACK

N

P15

Ice Dispense Input

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.

5

2

1

Start

Run

Compressor

T.O.L.

MAINTENANCE

LOW WATER

TIME DELAY

SLEEP CYCLE

MAKING ICE

LOW BIN

POWER

SERVICE

HI AMPS

HI PRESSURE

DRAIN CLOG

CLEANER FULL

High

Pressure

Switch

R

S

C

Gearmotor

Start

Relay

Start

Relay

N

L1

Fan

A B C D

Water Sensors

RESET

Fill

Valve

Drain

Valve

3

4

2

Bin T-Stat

Clean Switch

Drain Clog Sensor

P6

P21

P20

P19

P3

P22

P4

AUGER

WATER LEVELS

BIN

P11

HI PRS

L1

R

S

C

RED

WHITE

BLACK

BROWN

BLUE

RED

BLACK YELLOW

Compressor

Electrical Box

COMPRESSOR

1 2 3 4 5 6 7 8

BLACK

N

P15

Ice Dispense Input

MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 19

Normal operation – Stage 4

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.

5

2

1

Start

Run

Compressor

T.O.L.

MAINTENANCE

LOW WATER

TIME DELAY

SLEEP CYCLE

MAKING ICE

LOW BIN

POWER

SERVICE

HI AMPS

HI PRESSURE

DRAIN CLOG

CLEANER FULL

High

Pressure

Switch

R

S

C

Gearmotor

Start

Relay

Start

Relay

N

L1

Fan

A B C D

Water Sensors

RESET

Fill

Valve

Drain

Valve

3

4

2

Bin T-Stat

Clean Switch

Drain Clog Sensor

P6

P21

P20

P19

P3

P22

P4

AUGER

WATER LEVELS

BIN

P11

HI PRS

L1

R

S

C

RED

WHITE

BLACK

BROWN

BLUE

RED

BLACK YELLOW

Compressor

Electrical Box

COMPRESSOR

1 2 3 4 5 6 7 8

BLACK

N

P15

Ice Dispense Input

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 satised.

5

2

1

Start

Run

Compressor

T.O.L.

MAINTENANCE

LOW WATER

TIME DELAY

SLEEP CYCLE

MAKING ICE

LOW BIN

POWER

SERVICE

HI AMPS

HI PRESSURE

DRAIN CLOG

CLEANER FULL

High

Pressure

Switch

R

S

C

Gearmotor

Start

Relay

Start

Relay

N

L1

Fan

A B C D

Water Sensors

RESET

Fill

Valve

Drain

Valve

3

4

2

Bin T-Stat

Clean Switch

Drain Clog Sensor

P6

P21

P20

P19

P3

P22

P4

AUGER

WATER LEVELS

BIN

P11

HI PRS

L1

R

S

C

RED

WHITE

BLACK

BROWN

BLUE

RED

BLACK YELLOW

Compressor

Electrical Box

COMPRESSOR

1 2 3 4 5 6 7 8

BLACK

N

P15

Ice Dispense Input

20 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines

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