Welcome to Follett Corporation............................................................................................................................ 4
Ice transport tube .................................................................................................................................. 15
Start up .................................................................................................................................................. 17
Cleaning/descaling and sanitizing ..................................................................................................................... 17
Service .................................................................................................................................................................. 19
Refrigeration system diagram ................................................................................................................ 20
Refrigeration pressure data ................................................................................................................... 20
Compressor data ................................................................................................................................... 20
Gearmotor data ..................................................................................................................................... 21
Electrical control system operation ............................................................................................................... 22
Refrigeration system .................................................................................................................................... 28
Service procedures ...................................................................................................................................... 29
Replacement parts .............................................................................................................................................. 32
ice and beverage dispensers and top installation, Follett ice storage bins
R – Remote installation, Symphony
™
ice and water dispensers
D – Replacement icemaker, Symphony ice and water dispensers
Flake ice machine
MFD – Top installation, Follett ice storage bins
Follett equipment enjoys a well-deserved reputation for excellent performance, long-term reliability and outstanding
after-the-sale support. To ensure that this equipment delivers that same degree of service, we ask that you review
the installation portion of this manual before beginning to install the unit. Our instructions are designed to help you
achieve a trouble-free installation. Should you have any questions or require technical help at any time, please call
our technical service group at (877) 612-5086 or +1 (610) 252-7301.
Note: To expedite assistance, all correspondence or communication MUST include the model number, serial number
and complete and detailed explanation of the problem.
Before you begin
After uncrating and removing all packing material, inspect the equipment for concealed shipping damage. If damage
is found, notify the shipper immediately and contact Follett Corporation so that we can help in the ling of a claim,
if necessary.
Check your paperwork to determine which model you have. Follett model numbers are designed to provide
information about the type and capacity of Follett equipment. Following is an explanation of the different model
numbers in the
400 series.
Important cautions
Moving parts. Do not operate with front cover removed.
Hot parts. Do not operate with cover removed.
To reduce risk of shock disconnect power before servicing.
Most ice machine cleaners contain citric or phosphoric acid, which can cause skin irritation. Read caution label
on product and follow instructions carefully.
Ice is slippery. Maintain counters and oors around dispenser in a clean and ice-free condition.
Ice is food. Follow recommended cleaning instructions to maintain cleanliness of delivered ice.
§ 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
#00130299, high capacity #00978957, carbonless high capacity #01050442).
Ambient
Air temperature100 F/38 C max.50 F/10 C min. (best performance below 80 F/27 C)
Water temperature90 F/32 C max.40˚F/4˚C min. (best performance below 70 F/21 C)
Water pressure70 P.S.I max. (482 kPA)10 P.S.I. min. (89 kPA)
Ice machine performance is very sensitive to the quality of installation. To ensure proper performance, ease of
service and warranty coverage, it is critical that you follow the requirements detailed in this manual. If you cannot
meet these requirements or have questions, call our technical service group immediately at (877) 612-5086 or
+1(610) 252-7301.
Top mount ice machine on bin installation procedure (models MCD400A/WBT and
MFD400A/WBT)
Install ice machine and rough-in utilities
1. Install ice storage bin in its nal location.
2. Install one supplied grommet in large knockout in base of ice machine and second supplied grommet in ice
hole provided in top of ice storage bin.
3. Rough in plumbing and electrical per specications provided.
4. Flush all water lines before nal hook up.
5. Position ice machine with utility connections facing rear of bin.
§ If new storage bin and ice machine – position ice machine with connections facing rear of bin.
§ If using existing bin – place supplied gasket 2.5" (64 mm) from front of bin (Fig. 1). Position ice machine with utility
connections facing rear of bin.
Fig. 1
bin top
top view shown
Apply supplied gasket to bin top
as shown. Position ice machine
on
bin top.
existing gasket
add gasket
2.5"
(64 mm)
front of ice machine
6. Make nal plumbing and electrical connections.
7. Working from inside bin storage area, push end of transport tube without fasteners up through grommets
into ice machine, leaving about 2" (51 mm) hanging down in bin.
8. Route free end of tube to evaporator port.
9. Slip a hose clamp in free end of tube.
10. Push free end of tube on evaporator port and tighten clamp, making sure clamp is positioned on evaporator
side of ange (no ange on MFD400 series ake ice machine).
11. Position ice tube under oat bracket retaining tab.
12. Carefully slip ice level control stat alongside transport tube through both grommets and down into bin.
13. Run ice level control stat down through one side of cap tube fasteners attached to ice transport tube, form a 180˚ bend at end of tube and run back up through fastener (Fig. 2).
Fig. 2
bin top
ice transport tube
ice level control
stat fastener
ice level control stat
14. Adjust loop length to provide desired ice level. Loop must below end of ice transport tube.
15. Carefully bend end of cap tube to prevent it from slipping out of clamp.
Before turning power on
1. Clean and sanitize ice storage bin in accordance with cleaning procedure in ice storage bin installation
4. Push down on oat to force water out overow tube and into evaporator drain pan.
5. Check that water drains freely from evaporator drain pan.
6. Lift oat and check that oat valve shuts off incoming water when raised.
After turning power on
1. Turn power to ice machine on and conrm that gearmotor, compressor and fan motor start immediately.
2. Check that ice begins to enter bin within approximately 10 minutes.
3. With ice machine running, check that oat reservoir water level is approximately 3/8" (10mm) below internal
overow and adjust to this level (raised line on side of reservoir) if necessary.
4. After making ice for 10 minutes, put ice against ice level control stat cap tube and check that ice machine
shuts down.
5. Warm ice level control stat with your ngers and check that ice machine restarts in approximately
20minutes. (Bin must be calling for ice.)
RIDE model ice machine installation procedure (models MCD400A/WHS and MCD400A/WVS)
RIDE model ice machine performance is very sensitive to the quality of installation. To ensure proper performance,
ease of service and warranty coverage. it is critical that you follow the requirements detailed in this manual. If you
can not meet these requirements or have questions, call our technical service group immediately at (877) 612-5086
or +1(610) 252-7301.
Installing RIDE model ice machine and rough-in utilities without optional slide-out accessory
The requirements below are for ice machine installation without the Follett slide-out accessory. These procedures
ensure that the ice machine can be easily removed as one unit for cleaning and maintenance. For installation
with the slide-out accessory, refer to instructions to install ice machine and rough-in utilities with optional slide-out
accessory.
General requirements
§ Front of ice machine free of obstructions, plumbing lines, electric conduits.
§ 12" (305 mm) minimum clearance above ice machine for access to ice machine components.
§ 6" (15.3 cm) minimum clearance between exhaust side of ice machine and adjacent equipment.
§ Do NOT weld ice machine to counter channels.
§ Large, removable panels in counter face to allow ice machine removal.
§ Machine stand accessory required for ice machines not supported on counter channels.
Connection requirements
§ Compression ttings for water and drain lines.
§ Separate drains for condenser and ice machine. Do NOT connect drains.
§ 20A power supply with 6 feet.
bin signal from
dispenser
to ice machine
12"
305mm
separate power
to dispenser
front of
ice machine
clear
clearance
separate power
to ice machine
water shut off
compression fittings
for water and drain lines
Note: Diagram intended as guide only. All eld wiring to be installed in accordance with NEC and local electrical
Field wiring diagrams for RIDE model ice machine installations
§ All eld wiring must be installed in accordance with NEC and local electrical codes.
§ Field wiring diagram is intended only to aid electrician or technician in understanding how equipment works.
§ Should local codes require a hard-wired connection and/or shielded wiring, eliminate the cord and plug(s) and
follow the appropriate eld wiring diagram.
§ MCD400A/W and R400A/W ice machines have separate power supply from dispenser.
§ Electric disconnects required within 10 ft (3 m) for all hard-wired connections.
Recommended junction box preparation of hard-wired RIDE
model ice machines.
1. Cut plugs from supplied power cords.
2. Replace upper (power) strain relief with
a cord connector.
3. Mount two 2" x 4" junction boxes using supplied holes in
ice machine face.
4. Make power and bin signal connections.
25, 50 or 110 ice and water dispenser with ONE RIDE model ice machine
Installing RIDE model ice machine and rough-in utilities with optional slide-out accessory
The slide-out accessory allows the ice machine to be pulled out on a track from below a counter without
disconnecting utilities. A leg supports the ice machine in the full-out position. If your order did not include a slide-out
accessory proceed to ice machine ventilation and exhaust.
Step 1 – Installing track accessory (Follow either A or B below for RIDE model ice machine)
Track must be positioned ush against inside of counter and slightly above counter access opening.
A. When ice machine stand is used (required if ice machine is not supported on counter channels)
1. Bolt vertical utility panel to slide-out track assembly with supplied 10/32 screws.
2. Secure slide-out track assembly to ice machine stand with 10/32 screws provided.
3. Position ice machine stand in desired location and adjust stand legs to proper height and level in both
directions.
4. Using holes in anged legs as template, mark oor for 12 anchoring holes to be drilled.
5. Remove stand/track assembly and drill marked holes.
6. Reposition and anchor stand to oor with 12 fasteners appropriate to oor material (not supplied).
CAUTION!
Stand must be anchored to avoid tipping and possible injury when ice machine is pulled out.
B. When ice machine is supported on counter channels
1. Bolt vertical utility panel to slide-out track assembly with supplied 10/32 screws.
2. Position track assembly on counter channels (Fig. 3).
3. Using holes in track assembly as a template, mark and drill required holes in counter channels.
4. Remove track assembly on channels and drill marked holes.
5. Reposition track assembly on channels and secure using appropriate hardware (not supplied).
RIDE model ice machine ventilation and exhaust requirements
Exhaust air
Air intake
Standard
louvered grille
(supplied)
Supplied 2" (51mm) duct MUST be installed
to front of ice machine and mated flush to inside
of counter face opening.
Air in
through louver
Exhaust air
out side to
opening at least
18” (45.7) cm
from air intake
Air out through louver
Provide at least 100 sq. in.
(645 sq. cm) of counter
opening for exhaust air
Standard 2” (51 mm)
duct mates counter
opening (behind
grille) to condenser
front
Fabricator-supplied, custom air intake grilles must have 12" x 12" (30.5 cm x 30.5 cm) opening yielding
100sq.inches (645 sq. cm) of open air space within duct perimeter. Block off any open area outside of the air duct.
RIDE model ice machine ice transport tube installation
Incorrect ice transport tube installation can result in wet ice and dispensing problems. Follow guidelines below to
ensure correct installation. Call factory for assistance if you are unable to meet these requirements.
General requirements
§ Maximum length of tube run – 20 ft (6 m). Factory approval required for longer runs.
§ Run tube without dips.
§ One continuous length of tube; no splices.
§ Minimum radius of bends in tube – 6" (15.3 cm) inside radius.
§ Maximum number of bends – 6.
§ Insulation on entire run of ice tube.
Procedure
1. If installing MCD series ice machine refer to additional connection specications for Vision series ice and
beverage dispensers instructions below.
2. Select side, rear or top knockout in ice machine cabinet for tube entrance.
3. Install supplied grommet in knockout.
4. Remove ice machine top panel.
5. Install supplied insulation on entire length of tube.
6. Run insulated tube without dips between ice machine and dispenser and secure in place.
7. Cut insulation off tube where tube enters grommet.
8. Slide end of tube without insulation through grommet and run to evaporator port.
9. Cut tube to that length.
10. Install a section of insulation on tube from grommet to evaporator port.
11. Slip supplied hose clamp over free end of tube.
12. Pull insulation back from free end of tube.
13. Push tube on evaporator port.
14. Position clamp behind lip on evaporator port and tighten clamp.
Correct installation Incorrect installation
§ Length of run no more than 20 ft (6 m)
§ Tube run continuously from ice machine to
dispenser
§ Insulation on entire run of tube
§ No dips or tight bends
§ Tube secured in place
§ No splices
§ Dips in tube where water can collect
§ Splice or tight bend that restricts ice ow
§ Uninsulated tube that results in wet ice and
potential dispensing problems
Heat end of transport tube in cup of 160 F
(71 C) hot water to soften (1) and spread with
pliers before making connection (2).
Evaporator
install clamp behind lip
on evaporator port
grommet
RIDE model ice machine start up procedure
The start-up procedure below is intended to ensure that ice machine is operating properly after installation has been
made. Check each item listed and call factory immediately for assistance if you experience problems with unit.
Before turning on power
1. Turn on water to ice machine.
2. Push down on oat to force water through overow chamber into evaporator drain pan and check for proper
drainage of drain pan.
3. Check that oat valve shuts off incoming water when raised.
4. Check that hose clamp securely holds ice transport tube on evaporator port.
After turning on power
1. Turn on power to ice machine and conrm that gearmotor, fan motor and compressor start immediately.
2. Check that ice begins to enter dispenser bin area within approximately 10 minutes.
3. Check that oat reservoir water level is approximately 3/8" (.95mm) below overow during ice machine
operation and adjust to this level if necessary.
4. Put ice against bin level thermostat in dispenser bin and check that compressor and fan motor shut down
approximately 10 seconds after thermostat opens. Gearmotor should run for an additional 60 seconds.
5. Check that ice machine comes back on in approximately 20 minutes (bin signal must be present).
Cleaning/descaling and sanitizing
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.
SymphonyFrequency
Drain Lineweekly
Drain Pan/Drip Panweekly
Exterioras needed
Condensermonthly (air-cooled only)
Ice Machinesemi-annually
Transport Tubesemi-annually
* Ice machine must be cleaned and sanitized prior to start-up.
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 dispenser; ice
machine should be cleaned and sanitized rst, followed by the dispenser.
§ Icemaking system can be cleaned/descaled in place.
To ensure that your ice machine and dispenser are cleaned/descaled and sanitized properly, proceed as follows:
1. Clean/descale the ice machine
2. Sanitize the ice machine
3. Clean/descale the dispenser
4. Sanitize the dispenser
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.
Solution A: Following manufacturer’s instructions, mix cleaning solution of 1 gal. (3.8 L) 120 F (49 C) water and 7oz.
Continue to make ice with Solution B for 20 minutes.
2 1. Turn power to ice machine OFF.
22. Disconnect ice transport tube from evaporator outlet port. Rinse ice compression nozzle and drain lines in clean
water and reinstall on evaporator outlet. Reconnect ice transport tube to ice compression nozzle.
23. Drain any remaining Solution B from evaporator.
24. Fill reservoir almost to overowing with 120 F (49 C) clean water to rinse. Drain. Repeat two more times. Re-
clamp pinch clamp, replace drain plug, and re-secure drain tube ensuring that end of drain tube is above water
level in reservoir.
25. Open water supply valve (or unblock oat) and replace reservoir cover; restore power to ice machine and ensure
compressor switch is in ON position. Make ice for at least 15 minutes to ush any remaining Solution B from
system (RIDE ice machines with long ice transport hoses may take longer to ush out). Discard this ice and all
ice made during sanitizing.
26. Reinstall all parts and replace any panels removed prior to cleaning.
Service
Ice machine Operation (all models)
Follett’s ice machine consists of four distinct functional systems:
§ Refrigeration system
§ Water system
§ Harvesting 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 Follett ice machine uses a stainless steel jacketed
evaporator and operates on a continuous freezing
cycle. Water is supplied to the evaporator from the
Harvest system diagram
evaporator
port
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
ice transport tube
continuously removed by a slowly rotating (12 RPM)
auger. The auger carries the ice upward into the
compression nozzle
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
water
inlet
auger
compression nozzle are slightly restricted to further
compress the ice and produce the desired hardness.
Note: MFD series ake ice machines have no
compression nozzle. As the formation of ice continues,
ice in the transport tube is pushed through the tube to
the storage compartment in the ice dispenser or ice
storage bin.
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.
Performance with new RG Group 1/2 ton coil
(Note: Data expressed in lbs/hr and kg/hr)
Ambient Air Te mperature ˚F/˚C
60
16
451
204
423
192
394
179
371
168
352
160
70
21
447
202
413
187
390
177
361
163
342
155
50
10
60
16
70
21
80
27
90
32
Inlet Water Temperature ˚F/˚C
F
C
80
27
442
200
409
185
380
172
352
160
333
151
90
32
437
199
399
181
371
168
342
155
323
146
100
38
428
194
394
179
361
163
333
151
309
140
lbs.
kg.
lbs.
kg.
lbs.
kg.
lbs.
kg.
lbs.
kg.
Note: Nominal values – actual production may vary by ± 10%
Gearmotor data
Gearmotor current 2.25A (nominal)
Locked rotor amps 14A
Electrical control system operation
MCD400A/WBT, MCD400A/WHT and MFD400A/WBT wiring diagram
Follett ice machines used on top of an ice storage bin have a slightly different circuitry. A diagram for these ice
machines is shown below. The operational and diagnostic stages for these ice machines will be otherwise the same
as the following Stages 1 - 10.
The D400A/W, MCD400A/WVS and R400A/W wiring diagrams which follow illustrate the circuitry of Follett ice
machines used with ice dispensers. Both normal operation of the ice machine (Stages 1 - 6) and non-normal
diagnostic sequences showing torque-out (Stages 7 - 10) for use in troubleshooting ice machine problems are
shown.
Follett ice machines used on top of an ice storage bin have a slightly different circuitry. The operational and
diagnostic stages for these ice machines will be otherwise the same as Stages 1 - 10 that follow.
Circuitry notes
When the ice machine is used with a dispenser it receives power from two sources – the main power supply and
the bin control signal power from the dispenser. Disconnect both power sources before performing service. When
performing electrical service, always use a meter to determine whether or not the components being serviced are
energized.
§ High pressure cutout opens at 425 PSI and closes at 287 PSI (auto reset).
§ Compressor switch should read open in on position.
§ Compressor start relay is position sensitive. See label on start relay for proper orientation.
§ Bin signal may be 120 V, 60 Hz; 230 V, 50 Hz; or 24 V, 60 Hz. If bin signal is 24 V, 60 Hz, black bin signal wire must
be moved from LINE VAC terminal to 24 V terminal.
§ Flashing water LED at any time indicates that water signal to board had been lost for more than
one second.
§ Ten-second delay: There is a 10 second delay in reaction to loss of water (WTR) or bin (B-E) signals. If signals are
not lost for more than 10 seconds, no reaction will occur.
Normal operation – Stage 1
Power is supplied to L1 of the control board. The ice level control in the dispenser is closed and calling for ice,
supplying signal voltage to the control board. The control board will now go through the start-up sequence. Less than
30 seconds will elapse as the water sensor located in the oat reservoir checks for water in the reservoir. The Bin
Empty LED (B-E) will be on.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
RED
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
STA RT
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
OR
WATER
SENSOR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
PWR
RESET
DR
C
20M
60M
24V
WHITE
2ND
WTR
B-T
B-E
COMPRESSOR
WHITE
RED
COMMON
LINE VAC
BLACK
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
The water sensor veries water in the oat. The Water OK LED (WTR) comes on. At the same time, the gearmotor,
compressor, and condenser fan motor come on, lighting the Drive LED (DR) and compressor LED (C). The
compressor is started through a current style relay that is pulled in by the initial high current draw of the compressor.
The gearmotor start windings are also energized through a current relay (or start capacitor). The B-E and WTR LED
remain on.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
OR
WATER
SENSOR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
PWR
RESET
DR
C
20M
60M
24V
WHITE
2ND
WTR
B-T
B-E
COMPRESSOR
WHITE
RED
COMMON
LINE VAC
BLACK
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
RED
RED
SWITCH
BIN T-STAT
Normal operation – Stage 3
After the initial high current draw drops off, the gearmotor start relay contacts open dropping out the start winding (or
start capacitor). As the compressor comes up to normal running speed, the compressor start relay contacts open,
dropping out the start winding of the compressor. The ice machine is now in a normal icemaking mode. The ice
machine will produce ice until the bin level control in the ice dispenser is satised. The B-E, DR, C and WTR LEDs
are all on.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
RED
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
STA RT
RUN
1
L
T.O.L.
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
OR
WATER
SENSOR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
Once the ice level control opens, the B-E LED goes out. After a 10 second delay the LED (C), compressor, and
fan motor go off and the B-T LED comes on. (Should the ice level control not remain open for 10 seconds, the ice
machine will continue to run.) The gearmotor continues to run for 60 seconds. The purpose of this function is to drive
the remaining ice out of the evaporator and to boil off any refrigerant remaining in the evaporator.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
SENSOR
OR
WATER
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
PWR
RESET
DR
C
20M
60M
24V
WHITE
2ND
WTR
B-T
B-E
COMPRESSOR
WHITE
RED
COMMON
LINE VAC
BLACK
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
RED
RED
SWITCH
BIN T-STAT
Normal operation – Stage 5
The B-T LED will remain on for 20 minutes. The ice machine will not start while the B-T LED is on. To restart the ice
machine for troubleshooting purposes, depress the reset button to clear the control board.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
RED
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
STA RT
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
OR
WATER
SENSOR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
PWR
RESET
DR
C
20M
60M
24V
WHITE
2ND
WTR
B-T
B-E
COMPRESSOR
WHITE
RED
COMMON
LINE VAC
BLACK
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
When the dwell time of 20 minutes has expired, the B-T LED goes off. The ice machine will go through the normal
start-up sequence when the bin level control signals the control board for ice. The WTR LED will remain on as long as
the water sensor in the oat reservoir senses water.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
RED
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
STA RT
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
WATER
SENSOR
OR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
COMMON
LINE VAC
BLACK
24V
WHITE
PWR
RESET
DR
C
20M
60M
2ND
WTR
B-T
B-E
COMPRESSOR
SWITCH
WHITE
RED
BIN T-STAT
RED
RED
Diagnostic sequence – Stage 7
The 20 minute error LED (20M) is on indicating that the control board has sensed an over-torque condition (above 3A
on the gearmotor) and shut the ice machine down. The 20M LED will remain on for 20 minutes after an over-torque
condition has occurred. The ice machine will remain off as long as the 20M LED is on. When the 20M LED goes off,
the control board will try to go through a normal start-up sequence. The WTR LED remains on as long as the water
sensor in the oat reservoir senses water.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
RED
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
STA RT
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
OR
WATER
SENSOR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
If the restart is successful the 20M LED goes off, the 60 minute timer LED (60M) comes on. The 60M LED will remain
on for 60 minutes from restart. A lighted 60M LED tells the technician that the ice machine has experienced an overtorque condition. If the ice machine runs without problems for 60 minutes and no additional torque errors occur, the
60M LED will go off and the ice machine will continue normal operation.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
OR
WATER
SENSOR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
COMMON
LINE VAC
BLACK
24V
WHITE
PWR
RESET
DR
C
20M
60M
2ND
WTR
B-T
B-E
COMPRESSOR
SWITCH
WHITE
RED
BIN T-STAT
RED
RED
Diagnostic sequence – Stage 9
The second error (2ND) LED will come on if an over-torque condition occurs while the 60M LED is still lighted. The
2ND LED will indicate to the technician that two consecutive over-torque situations have occurred. The ice machine
will shut down at this time and lock out. It will not restart unless the manual reset button is depressed.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
RED
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
STA RT
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
SENSOR
OR
WATER
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
If the water level in the oat reservoir drops to an unacceptable level, the WTR LED will go out, shutting the ice
machine off. Also, the BT LED will come on, preventing the ice machine from restarting for twenty minutes. If water is
restored, the WTR LED will come back on and ash to alert the technician that water to ice machine has been lost.
The ice machine will then restart at the end of the 20 minute time delay. The ashing WTR LED can be cleared by
pressing the reset button.
INPUT
POWER
G
B
W
WHITE
WHITE
COMPRESSOR
C
T.O.L.
RED
STA RT
RELAY
4
GRD
BLACK
R
S
2
3
BLACK
BLACK
YELLOW
START CAP.
RED
FAN
M
BLACK
ORANGE
HIGH PRESSURE
SAFETY SWITCH
GEAR MOTOR
GEAR MOTOR
BLACK
M
S
STA RT
RUN
STA RT
1
L
T.O.L.
BLACK
BLACK
BLACK
BISON GEARMOTOR
LINIX GEARMOTOR
OR
WATER
SENSOR
WHITE
WHITE
RED
GRD
L1
L1
L2
CONTROL
L2
L2
BOARD
L2
L2
COMPRESSOR
FAN
DRIVE
BLACK
BLUE
PWR
RESET
DR
C
20M
60M
24V
WHITE
2ND
WTR
B-T
B-E
COMPRESSOR
WHITE
RED
COMMON
LINE VAC
BLACK
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
All service on refrigeration systems must be performed in accordance with all federal, state and local laws. It is the
responsibility of the technician to ensure that these requirements are met. Recharging ice machine to other than
factory specications will void the warranty.
1. Non-contaminated refrigerant removed from any Follett refrigeration system can be recycled and returned to
the same system after completing repairs. Recycled refrigerant must be stored in a clean, approved storage
container. If additional refrigerant is required, virgin or reclaimed refrigerant that meets ARI standard 700-88 must
be used.
2. In the event of system contamination (for example, a compressor burn out, refrigerant leak, presence of noncondensibles or moisture), the system must be repaired, evacuated and recharged using virgin or reclaimed
refrigerant that meets ARI standard 700-88.
3. Follett Corporation does not approve of recovered refrigerants. Improper refrigeration servicing procedures will
void the factory warranty.
Evacuation
Evacuate the system to a level of 500 microns. When the 500 micron level is reached, close valves and both manifold
and shut down the vacuum pump. Allow the system to sit for approximately 20 minutes. During this period the system
pressure should not rise. If the system pressure rises and stabilizes there is moisture in the system and further
evacuation is needed. If the pressure continues to rise check the system for leaks.
Ambients Minimum Maximum
Air temperature1 50 F/10 C 100 F/37.8 C
Water temperature2 40 F/4.4 C 90 F/32.2 C
1
Ambient air temperature is measured at the air-cooled condenser coil inlet.
2
Ambient water temperature is measured in the ice machine oat reservoir.
Ice capacity test
Ice machine production capacity can only be determined by weighing ice produced in a specic time period.
1. Replace all panels on ice machine.
2. Run ice machine for at least 15 minutes.
3. Weigh and record weight of container used to catch ice.
4. Catch ice for 15 or 20 minutes.
5. Weigh harvested ice and record total weight.
6. Subtract weight of container from total weight.
7. Convert fractions of pounds to decimal equivalents (ex. 6 lb 8 oz. = 6.5 lb).
8. Calculate production using following formula:
1440 min. x wt. of ice produced
= Production capacity/24 hr. period
Total test time in minutes
9. Calculated amount per 24 hours should be checked against rated capacity for same ambient and water
temperatures in Ice Production Tables.
Flashing water LED at any time indicates that water signal to board had been lost for more than one second.
Ten-second delay: There is a 10 second delay in reaction to loss of water (WTR) or bin (B-E) signals. If signals are not
lost for more than 10 seconds, no reaction will occur.
ProblemIndicatorsCorrective Action
Ice machine will not
run.
System status:
compressor,
gearmotor, and fan
motor inoperative.
Compressor will not
run.
System status:
gearmotor and fan
motor run.
Unit cycles
intermittently.
System status:
compressor, gearmotor,
and fan motor cycle.
Low ice production.
Poor quality ice.
Water leaks
from bottom of
evaporator.
Ice machine runs for
short period of time
and shuts down on
torque error.
System status: 20M or
2nd LED is lit.
Evaporator is iced up
on the outside. No ice
production.
System status:
compressor, gearmotor
and fan motor running.
1. No power to unit.
2. Open bin level control.
3. Water OK LED (WTR) not on.
4. 20M or 2ND LED is on indicating that rst or
second torque error has occurred.
5. Gear motor locked up (immediate torque error
indicated by LEDs when board is reset).
6. Open coil on gearmotor start relay causing an
immediate torque error.
1. Condenser coil plugged causing open overload or
high pressure cut-out.
2. Defective starting capacitor.
3. Defective starting relay.
4. Open motor winding.
5. No power output from compressor output terminal
on control board.
1. Float reservoir running dry, sensing probe
signalling for system to shut down.
1. Dirty air lter or condenser coil.
2. Restricted air ow to condenser coil.
3. Mineral coated evaporator.
4. Improper exhaust air provisions.
5. Faulty expansion valve.
6. Low refrigerant charge.
7. Superheat incorrect.
8. Inefficient compressor.
1. O ring seal broken.1. Replace O ring.
1. Kink in ice transport tube.
2. Bin level control remains in closed position.
3. Ice transport tube ruptured internally.
4. Worn evaporator bearings.
5. Faulty gearmotor start relay. Ice machine torques
out within 5 seconds of start-up.
6. Torque out occurs when storage bin lls to capacity.
1. Gearmotor running but no output rotation.
2. Float reservoir empty.
3. Air bubble in water supply line. Water
in reservoir but not in evaporator.
1. Check that unit is plugged in, circuit breakers are on.
2. Adjust or replace ice level control.
3. Check reservoir for water, restore water to unit.
4. See #6 below.
5. Repair or replace gearmotor.
6. Replace gearmotor start relay.
1. Clean condenser coil and replace overload if
necessary.
2. Replace start capacitor.
3. Replace relay.
4. Ohm out windings and replace compressor if
necessary.
5. Check terminal connection and replace control board
if necessary.
1. Check water supply to oat and oat operation. PC
board will have ashing WTR LED.
1. Clean or replace lter, clean condenser.
2. Remove obstruction.
3. Clean evaporator.
4. Provide proper exhaust air provisions per Follett
installation manual.
5. Replace expansion valve.
6. Check for leaks; repair, evacuate, and weigh in correct
charge.
7. Check that TXV sensing bulb is securely clamped in
place and not damaged; check that insulated bulb
cover is in place.
8. Replace compressor.
1. Eliminate kink and check that tube routing complies
with Follett ice machine installation manual.
2. Adjust or replace control.
3. Replace complete length of ice transport tube.
4. Inspect bearings for roughness or binding and replace
if necessary.
5. Replace gearmotor start relay.
6. Ensure that ice contacts bin thermostat before
backing ice up in transport tube. Refer to dispenser
manual for proper thermostat and ice tube mounting.
1. Check for broken gearmotor output shaft or damaged
gearbox.
2. Check for defective water sensor (water OK (WTR)
LED remains on even when oat empty or probe
removed from water).
25CR400A & 25HR400A R400A
25CR400W & 25HR400W R400W
50CR400A & 50HR400A R400A
50CR400W & 50HR400W R400W
110CR400A R400A
110CR400W R400W
All U150/VU155 series with air-cooled ice machines MCD400A
All U150/VU155 series with water-cooled ice machines MCD400W
All VU300 series with air-cooled ice machines MCD400A
All VU300 series with water-cooled ice machines MCD400W
Dispenser models Replacement
ice machine model
Order parts online
www.follettice.com
Freestanding dispensers with ice machines in the base