Follett L78614 Setup guide

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.
Installation and Service Videos:
www.follettice.com/servicevideolibrary
01234608R07
801 Church Lane • Easton, PA 18040, USA
Toll free [phone] • [phone]
www.follettice.com
Installation, Operation and Service Manual
After serial number L78614
Please visit https://www.follettice.com/technicaldocuments
for the Operation and Service manual for your unit.
Symphony Plus™12 Series
Ice and Water Dispensers
12CI425A, 12HI425A

Contents
Welcome to Follett. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Before you begin.......................................................................... 3
Specications .............................................................................. 4
Electrical ................................................................................ 4
Ambient................................................................................. 4
Plumbing................................................................................ 4
Ventilation clearances...................................................................... 4
Dry weight............................................................................... 4
Installation ................................................................................. 5
Before you begin.......................................................................... 5
Installing countertop dispensers without legs.................................................... 5
Installing countertop dispensers with legs accessory (P/N AF10LBLEGS) ............................. 6
Installing wall mount dispensers.............................................................. 6
User information ........................................................................... 11
How the dispenser works ...................................................................11
Panel removal ........................................................................... 12
Cleaning and sanitizing ..................................................................... 13
Weekly ................................................................................ 13
Monthly ................................................................................ 13
Semi-Annually (more often if conditions dictate) ................................................ 14
Ice Machine and Dispenser ................................................................ 14
Service ................................................................................... 16
Ice machine operation (all models) .......................................................... 16
The icemaking process.................................................................... 16
Water system ........................................................................... 17
Electrical system......................................................................... 18
Wiring diagram .......................................................................... 20
Wiring diagram - Lever only ................................................................ 22
Wiring diagram - SensorSAFE only .......................................................... 23
Ice machine operational and diagnostic sequences ............................................. 24
Diagnostic stages ........................................................................ 29
Refrigeration pressure data ................................................................ 33
Compressor data ........................................................................ 33
Refrigeration system...................................................................... 33
Dispenser troubleshooting .................................................................. 35
Lever model troubleshooting guide .......................................................... 35
SensorSAFE model troubleshooting guide .................................................... 35
Disassembly and replacement instructions..................................................... 36
Fan removal ............................................................................ 40
Thermostat and ice transport tube replacement ................................................ 41
Replacement parts ......................................................................... 42
Dispenser exterior........................................................................ 42
Wheelmotor and drive system .............................................................. 43
Dispense chute and splash panel (models with lever dispensing) .................................. 44
Dispense chute and splash panel (models with SensorSAFE infrared dispensing) ..................... 45
Ice machine components .................................................................. 46
Electrical components .................................................................... 48
Compressor ............................................................................ 49
Evaporator replacement parts .............................................................. 50
Water supply and drains................................................................... 52
Water treatment accessories for Symphony Plus ice and water dispensers.......................... 53
2 12CI425A, 12HI425A

Check your paperwork to determine which model you have. Follett model numbers are designed to provide
information about the type and capacity of Follett ice dispensing equipment. Following is an explanation of the
different model numbers.
12CI425A-LI
I = ice-only; no water
Dispense actuation, L = lever, S = SensorSAFE
Condenser type, A = air-cooled
Ice machine capacity in lbs per day
Ice machine location, I = integral
Dispenser conguration, C = countertop, H = wall mount
Approximate storage capacity in lbs
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.
§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.
§Ice is slippery. Be sure counters and oors around dispenser are clean, dry and free of ice.
§Do not block right side air intake or top air exhaust.
12CI425A, 12HI425A 3

Specications
air exhaust
16.00 "
(40.7 cm)
4.00 "
(10.2 cm)
3/8 " FPT
water inlet
3/4 " MPT drain
23.5 "
(59.7 cm)
18.00 "
(45.8 cm)
32.00 "
(82.6 cm)
air
intake
Front View Side View Rear View
22.625 "
(57.5 cm)
power cord (NEMA 5-15)
Electrical
§115 V, 60 Hz, 1 phase, 11.0A
§Connect to a 15A dedicated circuit.
Ambient
Air temp* 100 F/38 C Max. 50 F/10 C Min. Best performance below 80 F (27 C)
Water temp†90 F/32 C Max. 45 F/4 C Min. Best performance below 70 F (21 C)
Water pressure (psi/bar) 70/5 Max. 10/0.7 Min.
* Ambient air temperature is measured at the air-cooled condenser coil inlet.
† Ambient water temperature is measured in the ice machine reservoir.
Plumbing
12CI425A 12HI425A
Dispenser drain 3/4" MPT 3/4" MPT
Water inlet 3/8" FNPT 3/8" FNPT
Note: Water shut-off recommended within 10 ft. (3 m) of dispenser. Drain to be hard-piped and insulated. Maintain at
least 1/4" per foot (20 mm per 1 m) run of slope.
Ventilation clearances
§6" (15.3 cm) on right side of dispenser, 6" (15.3 cm) at top, and 12" (30.5 cm) at top recommended for service.
Note: Do not block right side air intake or top air exhaust.
Dry weight
§144 lb (65 kg)
4 12CI425A, 12HI425A

* Dow Corning is a registered trademark of Dow Corning Corporation in the United States and other countries.
Refrigeration system
Important: All service on refrigeration system must be performed in accordance with all federal, state and
local laws that pertain to the use of refrigerants. It is the responsibility of the technician to ensure that these
requirements are met.
R425 ice machine charge specications
Model Charge Refrigerant type
12CI425A, 12HI425A (air-cooled) 15 oz R404A
Refrigeration pressure data
Ambient Air Temperature ˚F/˚C
Inlet Water Temperature ˚F/˚C
F
C
50
10
60
16
70
21
80
27
90
32
60
16
460
208
437
198
415
188
405
184
395
179
70
21
425
193
405
184
385
175
375
170
365
166
80
27
390
177
372
169
355
161
345
156
335
152
90
32
355
161
340
154
325
147
315
142
305
138
100
38
320
145
307
139
295
134
285
129
275
125
lbs.
kg.
lbs.
kg.
lbs.
kg.
lbs.
kg.
lbs.
kg.
Air-cooled ice machine capacity/24 hrs.
Compressor data
Compressor current draw
Air-cooled
Air temp (F) 60 70 80 90 100
Comp Amperage (A) 5.8 6.1 6.2 6.2 6.3
High-side Pressure
(psi)
190 220 250 290 330
Low-side Pressure (psi) 27 29 31 33 36
Locked rotor amps 48A
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)
12CI425A, 12HI425A 5

Installation
Before you begin
§All dispensers must be installed level in both directions to ensure proper operation.
§Service and ventilation clearances: 6" (15.3 cm) on right side of dispenser, 6" (15.3 cm) at top for ventilation and
12" (30.5 cm) at top recommended for service.
§Countertop units installed without legs provide the option of taking utilities out bottom or back of dispenser (on
wall mount units and countertop units with legs, utilities exit from back). See counter cutout drawings for bottom
exiting utilities. For installations where utilities exit through back of dispenser, refer to back view drawings.
§Wall mount models without drain pan are designed for use above sinks.
§Counter depth must allow front of sink to be a minimum of 30.00" (76.2 cm) from wall.
Installing countertop dispensers without
legs
1. Position dispenser in desired location, mark
dispenser outline on counter and remove
dispenser.
2. Regardless of whether utilities will exit
through back or bottom of dispenser,
drill four 7/16" holes in counter to anchor
dispenser to counter (Fig. 1).
3. For utilities exiting through bottom only:
(a) Make cut out (Fig. 1).
(b) Move drain tting from back of dispenser and
mount (Fig.2).
(c) Cut drain tube to length and attach to barbed
connection.
(d) Move inlet water tting from back of
dispenser and mount (Fig.2).
(e) Cut water tubing to length and re-insert into
water tting.
4. For all units: Apply a thick bead
approximately 1/4" (7 mm) diameter of
NSF-listed silicone sealant (Dow Corning
RTV-732®or equivalent) 1/4" (7 mm) inside
marked outline of dispenser.
5. Carefully lower dispenser on counter in
proper position and secure to counter with
four (4) 3/8"-16UNC bolts.
6. Smooth excess sealant around outside of
dispenser.
Fig. 1
2.00"
(5.1 cm)
12.00"
(30.5 cm)
14.37"
(36.5 cm)
4X
Ø.437"
(11 mm)
hole 1.04"
(2.6 cm)
16.00"
(40.7 cm)
Cutout
connections
through
bottom
12.00"
(30.5 cm)
0.81"
(2.1 cm)
16.00"
(40.7 cm)
1.50"
(3.8 cm)
17.87"
(45.4 cm)
5.62"
(14.3 cm)
Fig. 2 - Bottom exiting utilities (countertop units)
bracket
inlet
tting
drain
tting
drain tube
6 12CI425A, 12HI425A

Installing countertop dispensers with legs accessory (P/N AF10LBLEGS)
CAUTION!
§Do not tilt unit further than 30° off vertical plane.
§Countertop dispensers that sit on legs (not bolted to counter) can be inadvertently moved. Care should be taken
when operating and cleaning to avoid accidents.
1. Carefully tip dispenser back to expose
underside and block up in place.
2. Screw legs (shipped taped to drain pan of
dispenser) into dispenser bottom, taking
care to seat legs securely against underside
of dispenser.
3. Attach bottom panel and hardware to bottom
of dispenser with supplied screws (Fig. 3).
4. Position unit in desired location and adjust
legs to level in both directions.
5. Make nal connections.
Fig. 3 - Bottom panel and leg assembly
bottom panel
screw
leg
12CI425A, 12HI425A 7

Installing wall mount dispensers
CAUTION!
§WALL PREPARATION: Wall and fasteners must be of sufficient strength to carry weight of unit (185 lb (83.9kg).
Hardware for this is not included.
Notes:
§SensorSAFE™ infrared dispensing is standard.
1. Recommended minimum counter depth and mounting height (Fig. 6) ensures that ice will drop into sink.
2. See Fig. 6 for model dimensions. The dimensions include the 0.5" (13 mm) mounting bracket supplied with the
unit.
3. Cut utility hole in wall as shown (Fig. 5).
4. Mount support bracket to wall using fasteners of sufficient strength (fasteners not included, see Fig.4).
5. Rough in water and drain lines (3/4" copper recommended for drain) (Fig. 9).
6. Lift dispenser onto support bracket, positioning unit so that hook on back of dispenser is captured by support
bracket angle (Fig. 6).
7. Install two (2) supplied 3/8"-16UNC screws through bottom of support bracket into bottom of dispenser (Fig. 4).
Slotted holes in support bracket allow you to adjust and level the dispenser. Ensure that the top of dispenser is
level or tilted slightly back toward the wall.
8. Remove bottom cover and make nal connections (Fig. 7).
9. Attach bottom panel and hardware to bottom of dispenser (Fig. 8).
10. Clean dispenser prior to use.
Fig. 4 – Wall mount bracket and fastener requirements
support bracket
screw
wall mounting bracket
= Customer supplied.
8 12CI425A, 12HI425A

Fig. 5 – Wall mount dimensions
ANCHOR POINTS
0.438" (11 mm)
CLEARANCE
FRONT VIEW
13.00" (33.0 cm)
16.00" TYP.
(40.6 cm)
2.88" (7.3 cm)
2.88" (7.3 cm)
13.50" (34.3 cm)
WALL CUTOUT
WALL STUDS
WALL MOUNT
BRACKET
1.08" (2.7 cm)
8.08" (20.5 cm)
15.08" (38.3 cm)
Fig. 6 – Wall mount side view
20.53" (52.2 cm)
18.51" (47.0 cm)
30.00" (76.2 cm)
MIN DISTANCE TO SINK FRONT
23.70"
(60.2 cm)
SUGGESTED POWER
CORD ROUTING
32.00" (81.3 cm)
CAUTION!
§Do not rest dispenser weight on bottom of support bracket. Dispenser weight to rest on top of the support bracket
(Fig. 6).
Fig. 7 – Wall mount unit bottom panel assembly
3/8” FNPT
Water
3/4” MNPT
Drain
BOTTOM VIEW
Fig. 8 – Wall mount unit bottom panel assembly
nut
support
bracket
screw
bottom panel
12CI425A, 12HI425A 9

Fig. 9 – Wall mount, utility location
FRONT VIEW
WALL MOUNT
BRACKET
3.70" (9.4 cm)
POTABLE WATER SUPPLY
3/8 COPPER TUBE
7.88" (20.0 cm)
DRAIN
3/4 COPPER TUBE 11.75" (29.9 cm)
POWER CORD EXIT
1.41" (3.6 cm)
0.92" (23 mm)
1.72" (4.4 cm)
WALL
CUTOUT
water and
drain tubing
(7.7 m)
MAX.
3.00"
WALL
SIDE VIEW UTILITIES EXITING WALL
User information
How the dispenser works
Follett’s 12 series automatic-load ice and water dispensers are equipped with Follett’s 425 lb (193 kg)/day ice
machine. In the continuous icemaking process, water freezes to the inside wall of the evaporator. A rotating
stainless steel auger carries the ice to the top of the evaporator where it is compressed and extruded through an
outlet port. The ice is then pushed through a tube to the storage hopper. When the hopper is full, a bin thermostat
opens and shuts the ice machine off. When the dispense mechanism is activated, a dispense motor is turned on,
causing the wheel to turn. This moves ice to the dispense chute where it drops by gravity into the container held
below the chute.
How SensorSAFE infrared dispensing works
Follett’s SensorSAFE infrared dispensing maximizes sanitation and minimizes the possibility of cross-contamination
by eliminating physical contact between the cup or container and dispenser. Sensors in the panel use reected
infrared light to detect the presence of the container and send a signal to a control board which then activates the
appropriate components for ice or water dispensing.
The SensorSAFE infrared dispensing package includes a cleaning switch under the left side of the front cover
which temporarily shuts off dispensing to allow cleaning of the panel and lenses. If the switch is not turned back on
after cleaning, the dispenser automatically resets after two minutes for normal operation.
SensorSAFE infrared dispensing also includes a time limit safety feature which automatically stops ice dispensing
after one minute of continuous dispensing. Dispensing can be resumed by moving the container away from the
dispenser and returning it to the activation zone.
10 12CI425A, 12HI425A

Panel removal
Fig. 10 Fig. 11
Top cover: Lift cover up and off Velcro strips. Front cover: Pull bottom of cover, then lift cover up and
forward to unhook from keyhole slots.
Fig. 12 Fig. 13
Splash panel: Remove 4 screws. Pull out bottom
of panel to allow top to slide out from under hopper
support lip.
Side panels: Remove screws. Lift panel to disengage
from back panel, then remove. Note: Before removing
right hand side, remove side louver panel by lifting up
and pulling forward on panel.
12CI425A, 12HI425A 11

Cleaning 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 of Follett’s ice and water dispenser and 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.
Follett recommends sanitizing the pressurized water lines prior to cleaning the ice machine/dispenser. Follett
offers two kits: order P/N 01089572 when a Follett lter system with a pre-lter bowl is present, or P/N 01089580
when a Follett lter system is not present. Follow the instructions provided with the respective kits to sanitize the
pressurized water lines immediately before cleaning the ice machine/dispenser.
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*
Symphony Plus Frequency
Drain Line weekly
Drain Pan/Drip Pan weekly
Exterior as needed
Condenser monthly (air-cooled only)
Dispenser and Components semi-annually
Ice Machine semi-annually
Transport Tube semi-annually
Ice Storage Area/Bin semi-annually
Pressurized Water Sanitizing semi-annually
* Ice machine and dispenser must be cleaned prior to start-up.
12 12CI425A, 12HI425A

Weekly
CAUTION!
§Do not use solvents, abrasive cleaners, metal scrapers or sharp objects to clean any part of the dispenser.
Dispenser drain pan and drain line
§Pour 1 gal. (3.8 L) of hot tap water into drain pan to ush drains.
Splash panel front, SensorSAFE infrared dispensing
1. Deactivate dispensing by pressing and releasing clean switch located on left side of unit under top front
cover.
2. Clean lens and splash panel front using a soft cloth and mild, non-abrasive, non-chlorine based cleaner.
3. Reactivate dispensing by pressing and releasing clean switch again.
Monthly
CAUTION!
§Do not use solvents, abrasive cleaners, metal scrapers or sharp objects to clean any part of the dispenser.
Condenser (air-cooled ice machine only)
§Use a vacuum cleaner or stiff brush to carefully clean condenser coils of lint and debris to ensure optimal
performance.
Semi-Annually (more often if conditions dictate)
§A cleaning procedure should always include both the ice machine and dispenser.
§Icemaking system can be cleaned in place.
CAUTION!
§Wear rubber gloves and safety goggles (or face shield) when handling SafeCLEAN Plus and IMS-III solutions.
§Use only Follett approved cleaners.
§It is a violation of Federal law to use the Nu-Calgon®IMS-III solution in a manner inconsistent with its labeling.
§Do not use solvents, abrasive cleaners, metal scrapers or sharp objects to clean any part of the dispenser.
Cleaning & sanitizing tool checklist
§(1 or 2) 1.5 gallon (or larger) plastic bucket
§(2) clean cloths
§Sanitary gloves
§Safety glasses
§(2) SaniSponge™ (P/N 00131524 - single sponge)
§SafeCLEAN Plus ice machine cleaner
§[OPTIONAL] Nu-Calgon IMS-III no-rinse sanitizer (P/N 00979674 – 16  oz. bottle)
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.
[OPTIONAL] No-rinse Sanitizing Solution: Follow the directions on the Nu-Calgon IMS-III packaging to mix
1gal. (3.8 L) of sanitizing solution. Use 100 F (38 C) water.
12CI425A, 12HI425A 13

Ice Machine and Dispenser
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 cover and turn OFF bin signal switch.
3. Dispense all ice from storage hopper and discard.
4. Remove top of machine and hopper lid.
5. Press CLEAN switch. The MAINTENANCE light will turn on and the machine will drain. Wait for the LOW
WATER light to turn on.
6. Remove lid from cleaning cup and ll (about 1 quart) until SafeCLEAN Plus solution overows from the
ice transport tube into the hopper. Place lid back on cup. Save remainder of SafeCLEAN Plus solution.
7. CLEANER FULL light will turn on and machine will start cleaning cycle then rinse three times; this
process takes approximately 15 minutes.
8. While ice machine is cleaning, clean dispenser as follows:
a. Remove center thumbscrew, locking plate, two wingnuts and backing plate from front of storage hopper.
b. Remove stud assembly, baffle, wheel, and any remaining ice.
c. Remove dispense chutes from splash panel.
d. Remove water dispense tube. Soak in SafeCLEAN Plus solution and clean thoroughly with a small brush.
Rinse with clean water and reinstall.
e. Submerse drain grille in SafeCLEAN Plus solution and allow to soak to remove any scale buildup.
f. Wipe inside of hopper lid, stud assembly, baffle, wheel, inside of storage area, dispense chutes, drain grille
and drain pan with damp cloth wrung out in SafeCLEAN Plus solution. Thoroughly rinse all parts with damp
cloth wrung out with clean water.
Note: To avoid possible damage to motor assembly, only use a damp cloth to clean storage hopper. Do not
allow water to run through motor shaft hole in bottom of hopper.
9. When machine is nished cleaning, the MAINTENANCE light will turn off.
Finish cleaning – SafeCLEAN Plus only
10. Reinstall dispense chutes, wheel, baffle, stud assembly and knurled nuts.
11. 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.
12. Soak one SaniSponge in remaining SafeCLEAN Plus solution.
13. Insert the sponge soaked in SafeCLEAN Plus 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. Replace top bearing insulation.
15. Turn ON bin signal switch. Wait for ice to push sponges through transport tube.
16. Collect sponges from ice storage bin.
1 7. Replace hopper lid, machine top, and install front cover.
18. After 10 minutes, dispense all ice and discard.
14 12CI425A, 12HI425A

[OPTIONAL] Finish cleaning – No-rinse sanitizing with Nu-Calgon IMS-III
19. Press CLEAN switch. The MAINTENANCE light will turn on and the machine will drain. Wait for the LOW
WATER light to turn on.
20. Remove lid from cleaning cup and ll (about 1 quart) until sanitizing solution overows from the ice
transport tube into the hopper. Place lid back on cup. Save remainder of sanitizing solution.
2 1. CLEANER FULL light will turn on and machine will start sanitizing cycle then rinse three times; this
process takes approximately 15 minutes.
22. While ice machine is sanitizing, sanitize dispenser as follows:
a. Wipe inside of hopper lid, stud assembly, baffle, wheel, inside of storage area, dispense chutes, drain grille
and drain pan with damp cloth wrung out in sanitizing solution. Do not rinse off the sanitizing solution.
Note: To avoid possible damage to motor assembly, only use a damp cloth to clean storage hopper. Do not
allow water to run through motor shaft hole in bottom of hopper.
23. Reinstall dispense chutes, wheel, baffle, stud assembly and knurled nuts.
24. When machine is nished rinsing, the MAINTENANCE light will turn off.
25. 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.
26. Soak one SaniSponge in remaining sanitizing solution.
2 7. Insert the sponge soaked in sanitizing solution into nozzle then insert a dry sponge into the nozzle.
28. 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.
29. Turn ON bin signal switch. Wait for ice to push sponges through transport tube.
30. Collect sponges from ice storage bin.
3 1. Replace hopper lid, machine top, and install front cover.
32. After 10 minutes, dispense all ice and discard.
User Interface and Exterior Cabinet
§Clean stainless steel panels with stainless steel cleaner.
12CI425A, 12HI425A 15

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
conductivity probes.
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 (12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
16 12CI425A, 12HI425A

Water system
The water level in the evaporator is controlled by a ll solenoid (Fig. 14) and level detecting sensors. Water sensing
rods (Fig. 15) 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. 14 – 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
WATER
RESERVOIR
EVAPORATOR
ICE
NOZZLE
DRAIN PAN
VENT
TO DRAIN CUP
Fig. 15 – Water level diagram
B A
C
D
B: COMMON (BLACK)
C: HIGH (ORANGE)
A: ALARM LOW (RED)
D: LOW (YELLOW) NORMAL OPERATING RANGE
12CI425A, 12HI425A 17

Access to electrical box and control board
The 12 series electrical box has been designed to slide out for easy access to the control board and more
convenient troubleshooting.
1. Remove top and front panels of dispenser
(for panel removal instructions see page12).
2. Remove electrical box cover.
3. Pull electrical box toward front of unit.
Fig. 16
electrical box
electrical
cover
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.
18 12CI425A, 12HI425A

Control board DIP switch settings
Sleep cycle dispense duration
OFF ON
12345678
4 5 4 5 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
12345678
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 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.
12CI425A, 12HI425A 19

Wiring diagram
WATER LEVELS
P17 BINP12 CLEAN SAFEP11
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
L1
GND
L2/N
BIN LEVEL
T-STAT
A B C D
BLACK
YELLOW
ORANGE
RED
BIN SIGNAL
SWITCH
MOUNTED ON
SPLASH PANEL
SOL
WTR
NEUTRAL
COMPONENTS
SENSOR
WATER SENSOR
ICE
CLN
WM
PWR
WTR
L1
GND
ICE
WHITE
BLUE
BISON GEARMOTOR
START
RELAY
3
42
YELLOW
BLACK
T.O.L.
START
RUN
FAN
FEED VALVE
DRAIN VALVE
RED #16 BROWN #14 BLACK #36 BLUE #07
GRN #17
GRN #27
BLACK #51
BLACK #23
BLACK #18
BLACK #21 WHITE #22
BLACK #25
GRN #20
BLACK #23 WHITE #26 BLACK #25 BLACK #24 BLACK #38 BLACK #39
GND TO
MAIN FRAME
POWER SWITCH
BLACK #51 WHITE #52
COMP.
R
C
S
O.L.
C2 START
1 2 3 4 5 6 7 8 9
GREEN #53
COMPRESSOR
COMPRESSOR
ELECTRICAL
BOX
BLACK #51
WHITE #52
GREEN #53
RED #54
ORANGE #55 BLACK #56
GREEN #57
BLACK #58
BLACK #59
LEVER ONLY
SENSORSAFE ONLY
BLACK #24
BLACK #25
BLACK #24
BLACK #21 (SENSORSAFE)
BLACK #25 (LEVER)
CLEAN SWITCH
4
1
6
41
2
5
BLACK #61
WHITE #62
GREEN #63
WHITE #64
BLACK #65 BLACK #66
GREEN #67
BLACK #68 BLACK #69
C1 RUN
WHEELMOTOR
M
COMPONENTS
MOUNTED ON
MAIN FRAME
41
BLACK #33BLACK #41
S
BLACK #32
WHITE #34
WATER
DISPENSE
SOLENOID
BLACK #28
BLACK #31
41
BLACK #29
41
BLACK #30
LEVER ONLY
WHITE #05 WHITE #35 WHITE #13 WHITE #15
SENSORSAFE ONLY
BLACK #66
BLACK #69
BLACK #71
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
26
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
WATER STATION
SWITCH
ICE STATION
SWITCH
COVER
INTERLOCK
SWITCH
BLACK #19
BLACK #19
BLACK #23
WHITE #22
WHITE #26
BLACK #23
WHITE #22
WHITE #26
BLACK #24
BLACK #24
BLACK
BLACK
20 12CI425A, 12HI425A