Follett Maestro Plus MC-425A/W, Maestro Plus MF-425A/W, Maestro Plus... Setup guide

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Installation, Operation and Service Manual
After serial number K39863
Please visit https://www.follettice.com/technicaldocuments
for the Operation and Service manual for your unit.
MC_425A/W, MF_425A/W, _P425A/W
Ice Machines - 230 V 50 Hz, 220 V 60 Hz
MCC425A/W_S
MCE425A/W_S
ER425A/W
MCC425A/W_T
MCE425A/W_T
MFC425A/W_T
MFE425A/W_T
CP425A/W
EP425A/W
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, review this guide carefully
before you begin your installation.
Should you have need technical help, please call our Technical Service group at [phone] or [phone].
Please have your model number, serial number and complete and detailed explanation of the problem when
contacting Technical Service.
Getting Started
After uncrating and removing all packing material. Inspect the equipment for concealed shipping damage. All freight
is to be inspected upon delivery. If visible signs of damage exist, please refuse delivery or sign your delivery receipt
"damaged." Follett Customer Service must be notied within 48 hours. Wherever possible, please include detailed
photos of the damage with the original packaging so that we may start the freight claim process.

2 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 ................................................................................ 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 - 230 V 50 Hz ....................................................... 37
Air-cooled ice machines - 220 V 60 Hz ....................................................... 38
Air-cooled ice machines - 220 V 60 Hz ....................................................... 39
Water-cooled ice machines - 230 V 50 Hz ..................................................... 40
Water-cooled ice machines - 230 V 50 Hz ..................................................... 41
Water-cooled ice machines - 220 V 60 Hz ..................................................... 42
Water-cooled ice machines - 220 V 60 Hz ..................................................... 43
Electrical components .................................................................... 44

CAUTION!
§Do not tilt 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.
§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 the dispenser in accordance with instructions found in this manual.
§Do not block air intake or 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.
§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 designed for commercial use.
§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.
§Connect to potable water supply only.
§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

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

Specications
Electrical
§Each ice machine and dispenser requires 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 (20 mm per 1 m 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)
Shipping weight
§73 kg (160 lb)
MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines 5

Technical specications
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
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)
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 aDimensions 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 and 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

Cleaning
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 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 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.
Recommended cleaning intervals*
Maestro 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 cleaned prior to start-up.
Weekly
The exterior may be cleaned with a stainless cleaner such as 3M™ Stainless Steel Cleaner & Polish or equivalent.
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 procedure should always include both the ice machine and bin/dispenser.
§Icemaking system can be cleaned in place.
Cleaning Tool Checklist
§(1) 1.5 gallon (or larger) plastic bucket
§(2) clean cloths
§Sanitary gloves
§Safety glasses
§SafeCLEAN™ Plus ice machine cleaner
§(2) SaniSponge™ (PN 00131524 - single sponge)
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 SafeCLEAN Plus solution.
§Use only Follett approved cleaners.
§Do not use solvents, abrasive cleaners, metal scrapers or sharp objects to clean any part of the dispenser.
SafeCLEAN Plus Solution: Follow the directions on the SafeCLEAN Plus packaging to mix 1 gal. (3.8 L) of Follett
SafeCLEAN Plus solution. Use 100 F (38 C) water.
Cleaning 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 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 cycle then rinse three times; this process
takes approximately 15 minutes.
7. When machine is nished cleaning, the MAINTENANCE light will turn off.
8. Remove top bearing insulation. 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. Soak one SaniSponge 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. Replace top bearing insulation.
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 the 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