Scotsman CMS1002R Installation Manual

CMS1002R

INTRODUCTION

This manual is intended as a reference for the
installation and service of a Scotsman ice maker
model CMS1002.

This model is a remote condenser cuber, 30" wide
and should be connected to a Scotsman remote
condenser.

TABLE OF CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Environmental Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

For the Installer

Machine & Bin Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Page

Coupling Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Service Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.

September, 1993

Page 1

CMS1002R

SPECIFICATIONS

Always refer to the nameplate, located on the back
of the cabinet, for the:

••model number,

••serial number,

••basic electrical

requirements,

••minimum circuit ampacity,

••maximum fuse size,

••and refrigerant charge.

A serial number plate with the model number,
serial number and refrigerant charge is located
behind the front panel, below the control box.

The unit comes from the factory with the correct
refrigerant charge contained in the receiver. The
refrigerant charge information is for recharging,
should that be necessary.

All utility connections and refrigerant line
connections are made at the back of the ice maker.

Before beginning installation, be sure that all of the
components necessary for complete assembly of
the ice system are available, and are the correct
components with regard to model, voltage, and
finish.

A stacking kit (KSCMS) is required for stacking
CMS1002 ice machines. It interconnects the sonor
bin ice level controls. CMS1002 may only be
stacked onto another CMS1002.

The CMS1002 will fit any 30" wide Scotsman bin
without a bin top. Other bins require a bin top.

Model Number Dimensions W"

x D" x H"
CMS1002RE-32A 30 x 24 x 27 208-230/60/1 R-22 256 oz.
CMS1002RE-3A 30 x 24 x 27 208-230/60/3 R-22 256 oz.

* The total system refrigerant charge is contained within the receiver of the ice machine. This number is for
recharging purposes only. If the nameplate has a different value, go by the nameplate.

Use Scotsman Remote Condensers RC1022 or RC1222. Use precharged tubing kit RT2225 (25’), RT2240
(40’), or RT2275 (75’).

Air Temperature
(cabinet)

0

Minimum 50
Maximum 1000 F. 1200 F. +10% 1000 F

F. -200 F. -5% 400 F

Basic Electrical Refrigerant Type Refrigerant Charge*

Remote Condenser
Air Temperature

Voltage Water Temperature

.

.

September, 1993

Page 2

FOR THE INSTALLER: Environmental Limitations

CMS1002R

Installation Limitations

The ice making portion of this ice system is
designed to be installed indoors, in a controlled
environment.

Minimum Maximum

0

Air Temp 50
Water Temp 40
Water Pressure 20 PSI 80 PSI
Voltage 197 253
Operating the ice machine outside of the above

limitations, or outdoors, is potentially damaging to
the machine; also it is misuse of the machine,
which may void the warranty.

Scotsman Ice Systems are designed and
manufactured with the highest regard for safety
and performance. They meet or exceed the
standards of UL, NSF, and CSA.

Scotsman assumes no liability or responsibility of
any kind for products manufactured by Scotsman
that have been altered in any way, including the
use of any part and/or other components not
specifically approved by Scotsman.

F. 1000F.

0

F. 1000F.

Water Limitations

An ice machine is a food manufacturing plant; it
takes a raw material, water, and turns it into a food
product, ice. The purity of the water is very
important in obtaining pure ice and in maximizing
product life. These general recommendations
should help keep the ice maker clean:

1. Filter the water used to produce ice. Water filters
vary greatly in ability and function. Install one that
filters out suspended solids to a dimension of 5
microns or smaller. The finer the filter the better,
but finer filters will clog sooner than course ones. It
may be necessary to add a course filter ahead of
the fine filter to prolong filter life.

2. Check with a water treatment specialist for a
water test, and recommendations regarding filters
and treatment.

Service Limitations

Some space on the sides, the back and the top
should be allowed for service and utility
connections.

Scotsman reserves the right to make design
changes and/or improvements at any time.

Specifications and design are subject to change
without notice.

NAMEPLATE, LOCATED ON

BACK PANEL.

A SERIAL NUMBER PLATE IS

LOCATED BEHIND THE

FRONT PANEL, NEAR THE

CONTROL BOX.

September, 1993

Page 3

CMS1002R

FOR THE INSTALLER: Machine & Bin Assembly

Overview:

This ice system is comprised of 4 major
assemblies:

1. The ice storage bin.

2. The ice maker itself.

3. The interconnecting refrigerant lines.

4. The remote condenser.
Additionally, there will be interconnecting wires

between the ice maker and the condenser. The
Scotsman remote condenser is powered from the
ice maker. The condenser must be located above
the ice maker, usually on the roof.

Storage Bin:

1. Measure the location of the ice machine floor
drain relative to the installed location of the bin.
Route all drain lines so that when the machine is
installed in its normal position, the drain tubes
terminate just above the floor drain.

2. Using corner posts from the bin’s carton as a
cushion, lay the bin on its back.

3. Install the legs into the leg sockets.

4. Move bin back to an upright position.

5. Remove all material that is packed inside the bin.

Ice Maker:

1. Arrange for proper electric, water and drain.
See instructions for the plumber and for the

electrician.

2. Position the ice storage bin in the selected
location which should have a minimum room
temperature of 50-degrees F. and maximum room
temperature of 100 degrees F.

3. Inspect the bin top mounting gasket which
should be flat, with no wrinkles, to provide a good
water seal when the cuber is installed on top of the
bin.

4. Install the modular cuber on top of the bin using
care to be sure a good seal is made between the
two cabinets, use of a mechanical lift is
recommended. Align the holes in the bottom back
of the cabinet to mate with the two mounting straps
on the top rear of the bin.

5. Use bolts and straps found in the hardware
package to secure the ice machine to the ice
storage bin. Attach the bin bumpers to the bin with
the bolt holding the mounting strap to the bin.

When alignment and leveling are completed,
tighten the bolts to secure the mounting straps.

September, 1993

Page 4

FOR THE PLUMBER

WATER TREATMENT

DEVICE

BACK VIEW OF MACHINE ON BIN:

INLET WATER AND DRAIN

CONNECTIONS

CMS1002R

Water Supply

The recommended water supply line is a 3/8-inch
O.D. tubing with a minimum operating pressure of
20 PSIG and a maximum of 80 PSIG.

Connect to cold water supply line with standard
plumbing fittings, with shut off valve installed in an
accessible place between the water supply and
the cuber. ln some cases a plumber will be
required.

Drain Connections:

All drains are gravity type and must have a
minimum of 1/4 inch per foot fall on horizontal
runs.

VENT FOR ICE

MACHINE DRAIN

3

⁄4" FPT DRAIN

FITTING

The drains to be installed must conform with the
local plumbing codes. Use only 3/4" rigid tubing.
The ice machine’s drain must be separate from the
bin’s drain. Both use 3/4" FPT fittings. Insulation of
the bin drain is recommended.

Install a vertical open vent on the drain line(s) high
point to ensure proper draining. The ideal drain
receptacle is a trapped and vented floor drain.

CONFORM TO ALL LOCAL CODES.

3

⁄8" MALE FLARE WATER INLET

3

BIN DRAIN

OUT THE BOTTOM

OF THE BIN

VENT FOR BIN

FLOOR DRAIN

⁄4" FPT

DRAIN

SHUT OFF

VALVE

September, 1993

Page 5

CMS1002R

FOR THE INSTALLER: Remote Condenser

Locate the condenser as near as possible to the
interior location of the ice maker.

Location of the condenser is limited by the
specific length of pre-charged refrigerant tubing
supplied for the application. The pre-charged
tubing connects the icemaker to the remote
condenser. The condenser must be above the
ice maker.

Select the best available location, protecting the
condenser from extremes of dirt, dust, and sun.

Meet all applicable building codes.
Roof Attachment:

Install and attach the remote condenser unit to
the roof of the building, using the methods and
practices of construction that conform to the local
building codes, including having a roofing
contractor secure the condenser to the roof.

Pre-charged Line Routing

/////////////////////////////CAUTION///////////////////////////////
Do not connect pre-charged tubing until all routing

and forming of the tubing is complete. See the
coupling instructions for connecting instructions.

SCOTSMAN REMOTE

CONDENSER

PRE-CHARGED

REFRIGERANT

LINE SET

////////////////////////////////////////////////////////////////////////////

1. Each set of precharged refrigerant lines
consists of a 3/8 inch diameter liquid line, and a
1/2 inch diameter discharge line. Both ends of
each line have quick connect couplings, one end
has flexible tubing: that end goes to the icemaker.

Note: The openings in the building ceiling or wall,
listed in the next step, are the minimum sizes
recommended for passing the refrigerant lines
through.

2. Have the roofing contractor cut a minimum hole
for the refrigerant lines of 1.75". Check local
codes, a separate hole may be required for the
electrical power to the condenser.

/////////////////////////////CAUTION////////////////////////////////
DO NOT KINK OR CRIMP REFRIGERANT

TUBING WHEN INSTALLING IT.
////////////////////////////////////////////////////////////////////////////

3. Route the refrigerant lines through the roof
opening.

Any excess tubing MUST be retained within the
building.

4. Spiral any excess length of pre charged tubing
inside the building. Use a horizontal spiral (as
illustrated) to avoid any traps in the lines.

5. Have the roofing contractor seal the holes in the
roof per local codes.

Follow straight line routing whenever possible.

September, 1993

Page 6

FOR THE INSTALLER: Coupling Instructions

CMS1002R

/////////////////////////////CAUTION/////////////////////////////
The couplings on the sets of precharged lines are

self sealing when installed properly. Carefully
follow the instructions:

//////////////////////////////////////////////////////////////////////////

1. Remove the protector caps and plugs. Wipe the
seats and threaded surfaces with a clean cloth to
be certain that no foreign matter remains on them.

2. Lubricate the inside of the couplings, especially
the O-Rings with refrigerant oil.

•• The 3/8 inch liquid line (schrader valve end)

goes to the remote condenser fitting marked
“liquid line”.

•• The other end of the liquid line goes to the

icemaker fitting marked “liquid line.”

•• The 1/2 inch discharge line (schrader valve

end) goes to the remote condenser fitting
marked “discharge line”.

•• The other end of the discharge line goes to the

icemaker fitting marked “discharge line”.

3. Begin tightening the couplings together by
hand, then using two wrenches (it is important that
ONLY the nut on the precharged lines be turned,
the other parts of the couplings must NOT be
allowed to turn or the process will tear out the
diaphragms and they will be loose in the
refrigeration system) tighten the coupling until it
bottoms out or a definite increase in resistance is
felt.

ONLY TURN NUT ON

TUBING KIT, HOLD

TUBING STATIONARY

USE TWO

WRENCHES

4. Using a marker or pen, mark a line lengthwise
from the coupling union nut to the bulkhead. Then
tighten the coupling and additional 1/4 turn. As the
nut turns, the line will show when 1/4 turn is made.

5. After all connections are made, and after the
king valve has been opened, check the couplings
for leaks.

September, 1993

Page 7

CMS1002R

FOR THE ELECTRICIAN: Electrical Connections

See the NAMEPLATE for current requirements to
determine wire size to be used for electrical
hookup. The cuber requires a solid chassis to
chassis earth ground wire. See Wiring Diagram.

Be certain the cuber is connected to its own
electrical circuit and individually fused. Voltage
variation should not exceed ten percent of the
nameplate rating, even under starting conditions.
Low voltages can cause erratic operation and may
be responsible for serious damage to the
icemaker.

Electrical connections are made at the rear of the
icemaker, inside the junction box.

/////////////////////////////CAUTION///////////////////////////////

Do not switch the ice maker on at this time, make
certain the master and compressor switches are
OFF when power is connected to the icemaker.
Power must be connected to the ice maker long
enough in advance of start up to allow the
crankcase heater to warm the compressor, usually
about 12 hours.

//////////////////////////////////////////////////////////////////////////////
Scotsman Condenser:

Separate electrical connections are made from the
ice maker to the condenser, as there is line power
interconnecting the icemaker to the condenser.

All external wiring should conform to the
national, state and local electrical code
requirements. Usually an electrical permit and
services of a licensed electrician will be
required.

REMOTE CONDENSER ELECTRICAL

CONNECTION (SCOTSMAN CONDENSER)

TERMINAL STRIPS

POWER SUPPLY TO

REMOTE SCOTSMAN

CONDENSER

POWER SUPPLY

TO ICE MAKER

September, 1993

Page 8

FOR THE INSTALLER: Final Check List

1. Is the ice maker cabinet in a room where
ambient temperatures are within the minimum and
maximum temperatures specified?

2. Is there clearance at both sides of the cabinet
and at the back and top for service and utility
connections?

3. Has water supply pressure been checked to
insure a minimum of 20 PSIG and a maximum of
80 PSIG operating pressure?

4. Is the cabinet level?

5. Check that any shipping material has been
removed from inside the cabinet.

6. Have all electrical and piping connections been
made?

7. Are the Master and Compressor switches on
OFF?

8. Has power been connected to the ice maker?

CMS1002R

9. Is the water supply line shut off valve installed?

10. Check all refrigerant lines and conduit lines, to
guard against vibration or rubbing and possible
failure.

11. Have the bin and cabinet been wiped clean
and sanitized?

12. Has the Field Quality Audit form been properly
filled out? Check for correct model and serial
numbers from Serial nameplate, then mail the
completed form to the SCOTSMAN factory.

13. Has the owner been given the name and
telephone number of the authorized SCOTSMAN
Service Agency serving him?

September, 1993

Page 9

CMS1002R

INITIAL START UP

Remote Condenser:

1. Check that all connections have been made.

Ice Maker:

1. Remove front panel by pulling out to unsnap.

2. Remove two screws and the control box cover.

3. Remove the evaporator cover.

4. Remove the left side service panel.

5. Check that the ON/WASH/OFF rocker switch
and the Compressor ON-OFF toggle switch are in
the OFF position, on the control box.

6. Locate and open the king (service) valve on the
receiver. Check that the crankcase heater has
been on long enough to warm the compressor
dome (about 12 hours).

7. OPEN the water supply line shut off valve.

8. Inside the control box is the shaft of the timer
and the switch assembly. Rotate the shaft of the
timer and switch assembly clockwise to where the
actuator arm on the microswitch drops off outer
cam into cam slot. See Timer Cam Positions.

9. Move the ON/WASH/OFF rocker switch to the
ON position.

TIMER CAM POSITIONS

ACTUATOR

CAM &
SHAFT

MICROSWITCH

EVAPORATOR

COVER

“KING”

VALVE

ON/WASH/OFF

SWITCH

10. Observe water fill cycle: Water pump operates
and water inlet solenoid valve OPENS, incoming
water flows from the valve through the tubing, the
reservoir fills and excess water drains out the
machine drain. At the end of the harvest cycle, the
water inlet solenoid valve will close and the water
fill cycle is complete. If the reservoir is not full,
advance the shaft of the timer clockwise into a new
harvest cycle; this opens the water valve again.
The water pump pumps water up to the water
distributor at the top of each evaporator plate,
where water is uniformly dispensed, cascades
down both sides of each evaporator plate and
drains back into the reservoir for recirculation.

11. Check that the water cascades down over
each cube mold and into the reservoir.

FREEZE

PORTION

HARVEST

PORTION

12. When the reservoir is full, move the
compressor ON-OFF toggle switch, to the ON
position.

13. Check operation of the freezing cycle: The
compressor is operating.The icemaking process
begins; feeling the metal parts of the evaporator
plate reveals cold temperature, very shortly ice
begins to form. Tubing will become frosted at the
top of the evaporator plate. Freezing time will
range between 13 and 15 minutes. Longer time for
temperatures above 70 degrees F. and shorter
time required when temperatures are below
70-degrees F. Average complete cycle time is
about 16 minutes.

September, 1993

Page 10

INITIAL START UP

1 1⁄4"

CMS1002R

14. Check CUBE SIZE
The dimensions of the cubes are fixed by the size

and shape of the molds on the evaporator plate,
except that the thickness of the cube MAY need to
be adjusted at start up. There is only one size of
cube that is correct; adjusting the cube size control
to that size of cube will allow the ice maker to
produce ice at its most efficient size. The correct
size cubes will be fully formed at the edges; will
harvest off of the evaporators beginning with
individual cubes at the top of the evaporator, then
vertical strips for the balance; and will appear
similar to the illustration for “Correct Size Cube”.

Adjust for the correct size if needed:

To produce SMALLER sized ice cubes:
Locate cube size control knob, in the front of the

control box. Rotate this knob one eighth of a turn
counter clockwise. Observe size of the ice cubes
in the next ice cube harvest and adjust again if
needed, until the correct ice cube is achieved.

To produce LARGER ice cubes:
Locate cube size control on the front of the control

box. Rotate the knob one eighth of a turn
clockwise. Observe size of ice cubes in the next
cube harvest and adjust again until correct the ice
cube size is achieved.

CUBES (ACTUAL SIZE)

TOO

THICK

CORRECT

SIZE

CUBE

Note: Optimum performance will be achieved when

the ice machine is adjusted to produce this size and

shape of cube. The typical batch weight at this

1

⁄4"

1

setting is between 8.25 and 9 pounds.

15. Check harvest time. The machine must harvest
all of the cubes before returning to a freeze cycle.

Increase the harvest time if there is less than 15
seconds of harvest time after the last cube has
fallen into the bin.

Decrease the harvest time if there is much more
than 15 seconds of harvest time after the las cube
has fallen into the bin. Note: Harvest time is
dependent upon the water and air temperatures at
the ice machine. Do not adjust harvest time too
short, as this will cause a freeze up.

See the next page for detailed harvest time
adjustment instructions.

16. Check ICE BIN LEVEL CONTROL
The amount of ice maintained in the bin is

adjustable. The normal setting is “full”. If desired,
the machine may be adjusted to shut off the
machine when the bin is only partially full.

1. Open the bin door and locate on the bottom of
the ice machine, the ice level sensor. It’s in a

TOO

THIN

socket about 2" in diameter and located left of the
evaporator plates.

2. When the machine is running, wait untIl near the
end of a “harvest” cycle.

3. Hold a flat object about the size of this service
manual over the ice level sensor socket.

4. The ice machine should turn off at the end of the
harvest cycle.

5. Slowly lower the flat object straight down.

6. The ice machine will start again at the point
where it will maintain the ice level.

17. Replace all panels.

September, 1993

Page 11

CMS1002R

ADJUSTMENTS

TIMER CAM POSITIONS

ACTUATOR

CAM &
SHAFT

MICROSWITCH

Adjustment Of The Timer & Switch Assembly

One complete revolution of the cam on the timer
represents eight minutes. If left as factory set, four
and one-half minutes comprise the freezing cycle
portion during cam rotation, and the final three and
one-half minutes is the defrost/harvest cycle.
Rotating the shaft of the timer cam clockwise will
put the ice machine in the freeze or harvest cycle.

////////////////////////////// WARNING ///////////////////////////////
Disconnect electrical power supply to icemaker
whenever adjustment procedures are performed.

///////////////////////////////////////////////////////////////////////////////
To adjust the timer & switch assembly:

FREEZE

PORTION

TIMER ADJUSTMENT

MICROSWITCH

HARVEST
PORTION

SHAFT OF

CAM

1. Remove front panel.

2. Remove control box cover.
A. To start the HARVEST CYCLE: Slowly rotate

the shaft of the timer and switch assembly
clockwise until the actuator arm on the microswitch
begins the harvest cycle.

B. To start the FREEZING CYCLE: Slowly rotate
the shaft of the timer and switch assembly
clockwise, until the actuator arm on the
microswitch starts the freezing cycle.

C. To adjust the length of the harvest cycle:

1. Loosen the adjustment screw on the cam, and
rotate the shaft of the cam to move the top part of
the assembly. More of a gap between the high and
low portions will yield more harvest time.

2. Tighten the set screw.

3. Replace the control box cover and front panel.
lt is important that the length of the harvest cycle

allow enough time for all the ice cubes to fall from
the evaporator. Too short of a time will cause the
evaporator to freeze up and stop harvesting ice.
Too much time wastes icemaking capacity, energy
and water. Adjustment of the harvest cycle may
require an adjustment of the cube size control.

SET SCREW

Adjust Bin Ice Level

1. Locate ice level control switch.

2. Move switch to the desired position.

3. To test, wait until the ice machine is near the
end of a “harvest” cycle, if there is ice in the bin
higher than the position the ice level control is set
for, the ice machine will turn OFF at the end of the
harvest cycle. If no ice in the bin, test again as
described under, “To Test The Ice Level Setting”.

September, 1993

Page 12

COMPONENT DESCRIPTION

CMS1002R

Compressor Contactor

The compressor contactor carries the compressor
line current. The contactor is wired so any control
in the pilot circuit, such as the bin control, and high
pressure controls, etc., will cause the contactor
holding coil to be de energized, when the control
contact OPENS, thereby breaking the circuit to the
compressor.

Cube Size Control

This reverse acting (closes on temperature fall)
thermostat determines how long the freezing cycle
will be. The cube size control closes its contacts
when the evaporator cools to the set temperature,
starting the timer. A variation in heat load (either
ambient air or incoming water temperature) will
affect the efficiency of the refrigeration system, and
that will vary the length of time it takes the
evaporators to cool to the temperature at which the
cube size control is set to close, which, in turn, will
affect the overall cycle time. See CUBE SIZE
ADJUSTMENT BEFORE attempting to adjust the
control.

Hot Gas Solenoid Valve

The hot gas solenoid valve opens only during the
harvest cycle. When it opens, it diverts the hot
discharge gases so that they flow directly into the
evaporator plates, by-passing the condenser and
thermostatic expansion valve. The hot gases warm
the evaporators, releasing the ice cubes from the
ice cube molds. The hot gas solenoid valve is
installed in a branch of the discharge line from the
compressor, and when the timer switches the ice
machine into the harvest cycle, the energized
solenoid coil lifts the valve stem within the valve
body, allowing the hot discharge gas to be diverted
to the evaporators.

High Temperature Cut Out

This temperature sensor is located next to the hot
gas valve, on the outlet side.

During normal operation, it does not affect the ice
machine, but it will shut the machine off if the hot
gas line overheats. It is an automatic reset.

Relay

The multi-function, three pole, double throw, relay
plugs into a socket on the printed circuit board in
the control box. The relay functions in part to
by-pass the bin control during the harvest and
freeze cycles, preventing the icemaker from
shutting off in the middle of a cycle. The bypass
action allows only complete freeze and harvest
cycles; the only time that the ice maker can shut
off on bin control is as the end of the harvest cycle.

Timer - Timer & Switch Assembly

The timer begins to turn when activated by the
cube size control. The outer surface, or large
diameter lobe of the timer cam, determines the
length of time for finish freezing of the ice cubes,
while the inner surface, or small diameter lobe,
determines length of the harvest cycle. The
single-pole, double throw microswitch on the timer
controls the power to the plug in relay coil, making
it either the freezing or harvest cycle. The
microswitch is actuated by a cam assembly
directly connected to the timer motor. The timer
cam can be adjusted to vary the defrost time, as
required. One complete rotation of the cam will
take eight minutes. Harvest is preset at 2 and a
quarter minutes.

September, 1993

Page 13

THE USER CAN

SELECT THE

AMOUNT OF ICE

TO BE

MAINTAINED IN

THE BIN.

CMS1002R

COMPONENT DESCRIPTION

Ice Level Control

This electronic control uses sound waves to
measure the distance between the bottom of the
ice machine and the top of the ice in the bin. It is
designed to control the machines ice production to
maintain that distance.

The control is adjustable so that the ice machine
will maintain a certain height of ice. It will not fill
any closer to the ice machine than 8", and will not
work if the distance to the bottom of the bin is
greater than 8 feet.

Because it uses sound waves, a slight “ticking”
sound can be heard coming from the bottom of the
machine.

ICE LEVEL

SELECTOR

SWITCH

ON/OFF/WASH SWITCH

SOUND
WAVES

FULL

PARTIAL

September, 1993

Page 14

COMPONENT DESCRIPTION

WATER PUMP

CMS1002R

Electric Water Inlet Valve

The water inlet solenoid valve fills the reservoir
assembly with water. Excess water overflows out
the overflow standpipe located at the back of the
reservoir. This action fills and rinses the reservoir
during each harvest cycle. The flow rate is .75
g.p.m.

Water Distribution System

The water distribution system evenly supplies
water to all cells of the evaporator plates. The
water pump pumps water from the reservoir up the
vertical tygon tube to the tee. From there water is
channeled through the water manifold to the water
distributors, above each evaporator plate, and
from six holes within each distributor, water flows
to the cells of each side of the evaporator plates.
Gravity flow returns the unfrozen excess portion of
water to the reservoir for recirculation.

Reservoir

The reservoir, located below the evaporators,
stores the inlet water charge, and collects the
water that flows over the evaporator plates.

Strainer

A water strainer is located in the potable inlet water
line before the water inlet solenoid valve. Clean
the water strainer as needed.

High Pressure Safety Control

This is a manual reset control that shuts down the
icemaker, should the discharge pressure ever
reach 400 PSIG.

WATER

DISTRIBUTION

SYSTEM

STRAINER

EVAPORATOR

RESERVOIR

HIGH PRESSURE

CUT OUT

ELECTRIC WATER VALVE

September, 1993

Page 15

CMS1002R

SERVICE SPECIFICATIONS

When servicing a machine, it’s helpful to compare
that unit’s operating characteristics to those of a
new, clean, normally operating machine. What
follows is that type of information:

COMPONENTS

Timer: Makes one complete revolution in 8 minutes. The harvest time is factory preset at 2

The harvest time is adjustable as required.

Inlet Water Valve: Opens and admits
Cube Size Control: Reverse acting temperature control, contacts close between 24

adjusted to close at 13

0

F.

3

⁄4 gallon per minute during the harvest cycle.

0

F. and 00F. Typically

Pump Down Control: Contacts open at 20 P.S.I.G. and close at 35 P.S.I.G.
High Pressure Safety Switch: Contacts open at 400 P.S.I.G.
Bin or Ice Level Control

Maximum Full Height : 8" from the base of the ice machine.
Partial Fill Setting: 21" - 22" from the base of the ice machine.
Maximum Storage Bin Interior Height: 8’ from the base of the ice machine.

OPERATING CHARACTERISTICS

The values listed below are representative of
values seen at a wide range of air and water
temperatures and are for a normal cube size.

Temperatures are Condenser/ Ambient Air/ Water

FREEZE CYCLE

Average Discharge Pressure at Average Temp. 275-210 P.S.I.G.
Suction pressure at the end of the freeze cycle 26-23 P.S.I.G.
Freeze Time 13-15 minutes

1

⁄4 minutes.

HARVEST CYCLE

Average Discharge Pressure 175 P.S.I.G.
Average Suction Pressure Lo Temp (0/70/55) 75-80 P.S.I.G.

Average Temp (90/90/70) 80-90 P.S.I.G.
High Temp (110/90/80) 90-100 P.S.I.G.

Harvest time is assumed to be 2.25 minutes. This can be adjusted to suit local conditions.

This unit uses R-22. The system charge is 256 ounces. If the nameplate lists a different quantity of

refrigerant, go by the nameplate.

September, 1993

Page 16

CMS1002R

CLEANING

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In

order to receive the best return for that investment, it MUST receive periodic maintenance.
Maintenance and Cleaning should be scheduled at a minimum of twice per year.
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

CLEANING: ICEMAKER
///////////////////////////////WARNING/////////////////////////////
Electrical power needs to be on when doing in

place cleaning.
/////////////////////////////////////////////////////////////////////////////

1. Remove front panel.

2. Switch the Wash/Off/Ice switch to OFF.

3. Remove the front liner.

4. Remove and discard all ice from the storage bin.

5. Locate the reservoir drain cap, remove the cap
and drain the reservoir. Replace the drain cap. If
the reservoir doesn’t drain completely, disconnect
the pump hose attached to the water distributors
and place the end of the hose in a bucket. Switch
the Wash/Off/Ice switch to Wash, and allow the
pump to discharge the rest of the water. Reattach
the hose to the water distributors.

6. Mix 8 ounces of Scotsman Ice Machine Cleaner
with 1 gallon of warm (95
pour into the reservoir until full.

0

F. - 1150F.) water and

9. Switch the machine to “wash” and continue to
add fresh water to flush residual cleaner from the
system. Switch the Wash/Off/Ice switch off.

10. Sanitize the ice maker and bin, see “Sanitize
Water System”.

11. Replace the front liner.

12. Switch the Wash/Off/Ice switch back on.

13. Replace the front panel

14. Check the next batch of cubes to make sure all
of the acid taste is gone.

/////////////////////////////////CAUTION//////////////////////////////
DO NOT use ice produced from the cleaning

solution. Be sure none remains in the bin.
////////////////////////////////////////////////////////////////////////////////

15. Remove and discard all ice from the storage
bin, pour hot water into the storage bin to melt the
cubes and also clean out the bin drain.

16. The unit is now ready for continued automatic
operation.

7. Switch the Wash/Off/Ice switch to “wash”. Let

Scotsman Ice
Machine Cleaner
contains acids.
These compounds
may cause burns.

If swallowed, DO NOT
induce vomiting. Give
large amounts of water
or milk. Call Physician
immediately. In case of
external contact, flush

with water.

KEEP OUT OF THE
REACH OF CHILDREN.

the unit operate for 30 minutes, then switch the
unit off.

8. Drain the reservoir again (repeat step 5).

Strainer:

A water strainer is located in the water line before
the inlet water solenoid valve. It is designed to
catch large particles that may be in the water. To
clean:

1. Shut off
water supply.

2. Unscrew
screen from
strainer.

3. Brush
particles from
screen

4. Replace
screen in
strainer.

5. Turn water
supply back on.

SCREEN

September, 1993

Page 17

CMS1002R

CLEANING

SANITIZE WATER SYSTEM

1. Remove and discard all ice from the bin.

2. Remove front panel.

3. Drain the reservoir

4. Prepare 2 gallons of an approved sanitizer
solution in accordance with the instructions on the
package.

5. Pour 1 gallon of the sanitizer into the ice maker
reservoir.

6. Move the main switch to “Wash”, and allow the
solution to circulate for a MINIMUM of 5 minutes.

7. Move the main switch to “Off”.

8. Pull out the drain plug and drain the reservoir.

9. Using a clean sponge and the remainder of the
sanitizer solution, wipe the interior of the
evaporator cover and the inside of the storage bin,
taking care to wipe all surfaces that are normally in
contact with ice.

10. Replace the evaporator cover. Replace the
front panel.

11. Move the master switch to ON.

SCOTSMAN REMOTE CONDENSER

1. Disconnect electrical power at the icemaker.

///////////////////////////////WARNING///////////////////////////
Disconnect electrical power before beginning.
////////////////////////////////////////////////////////////////////////////

2. Wipe off any surface dust from the intake side of
the condenser.

3. Vacuum the coil, or clean with coil cleaner.

4. The coil is clean when light can be seen through
the fins.

5. Reconnect electrical power.

SANITIZE ICE STORAGE BIN

This procedure is to be done monthly

1. Remove and discard all ice from the bin.

2. Switch the ice maker off.

2. Prepare 2 gallons of an approved sanitizer
solution in accordance with the instructions on the
package.

3. Using a clean sponge wipe the inside of the
storage bin and door, taking care to wipe all

surfaces.

ON/OFF/WASH

SWITCH

4. Rinse the interior of the storage bin
using clean water and the sponge used
in step 3.

5. Switch the ice machine back on.

RESERVOIR

DRAIN

September, 1993

Page 18

FREEZING CYCLE OPERATION

CMS1002R

Water from the sump assembly is pumped to the
water distributor system at the top of each
evaporator plate. From the water distributor the
water cascades by gravity over all cells of the plate
and to the sump assembly below.

At the beginning of the freezing cycle, the electrical
circuit is completed to the compressor and the
water pump. The water pump operates
continuously, through both the freezing cycle and
the harvest cycle.

During the freezing cycle, the hot gas solenoid
valve is CLOSED and the water inlet solenoid
valve is CLOSED. When the ice cubes are partially
formed, the cube size control will sense the
temperature at which it is preset to CLOSE. This
will complete the electrical circuit to the timer. The
timer then controls the remainder of the freezing
cycle. The timer will keep the icemaker operating
in the freezing cycle for a selected length of time.
This will give the ice cubes time to fully form. after
that selected length of time, the timer will switch
the icemaker into the harvest cycle, through the
contacts of the timer assembly microswitch.

Low Temperature Freeze:

When the outside air temperature is low, the Head
Pressure Regulator will close off the liquid line to
the receiver, causing liquid refrigerant to back up
into the condenser unitl the head pressure builds
up to 220 PSIG. While this is occuring, the head
pressure regulator passes discharge gas into the
receiver to keep the refrigerant flowing.

September, 1993

Page 19

CMS1002R

HARVEST CYCLE - HOT GAS BYPASS

When the timer switches the icemaker into the
harvest cycle, high pressure, high temperature gas
refrigerant being discharged from the compressor
is diverted from the condenser through the hot gas
solenoid valve into each evaporator plate. During
this cycle, the refrigerant bypasses the condenser.
ln the electrical circuit, both the compressor and
the water pump are operating and the hot gas
solenoid valve is energized and OPEN and the
water inlet solenoid valve is OPEN.

The finished ice cubes are released from the sides
of each evaporator plate by the warming effect of
the hot gas condensing in each evaporator plate
and the water cascading over the ice cubes. The
released ice cubes drop into the ice storage bin
below. At the end of the harvest cycle, the timer
cam will push the actuator arm to the microswitch
IN. If the ice level control is still CLOSED, a whole
new cycle will begin. If the ice level control is
OPEN, the icemaker will begin to shut OFF.

Pump Down Cycle:

When the ice level control is open at the end of the
harvest cycle, power is removed from the liquid
line valve coil, and the pump down cycle begins.
The compressor will continue to run until the pump
down control, sensing low side pressure, opens at
20 PSIG.

September, 1993

Page 20

SERVICE DIAGNOSIS

CMS1002R

SYMPTOM

No ice, machine does not run 1. No electrical power 1. Restore power

No ice, compressor does not run,
rest of ice machine does.

No ice, no water over evaporators 1. Water pump does not pump 1. Check/replace water pump

No ice, everything runs 1. Too much heat load 1. Check for slow leak thru of water

Low ice production 1. Too much heat load. 1. Check condenser air inlet and

POSSIBLE CAUSE

2. Circuit breaker tripped or fuse
blown

3. High pressure control open. 3. Reset HPC, check fan motor for

4. Bin level control holding machine
off

5. High temp. cut out open 5. Hot gas valve leaks thru, replace

6. Timer switch open 6. Replace timer

7. On/Off switch open 7. Check or replace switch.

8. Circuit board open 8. Replace circuit board.

1. Compressor on/off switch open 1. Check or replace switch

2. Open contactor coil 2. Replace contactor

3. Liquid line valve does not open 3. Check electrical connections to

4. Pump down pressure switch
does not close

5. Thermostatic Expansion valve
clogged or does not open.

2. No water in reservoir 2. Check/replace water inlet valve.

2. Low on refrigerant 2. Check pressures, if low

3. Suction pressure too high 3. Defective compressor - replace

2. Compressor inefficient. 2. Replace compressor

3. Non condensable gasses in
refrigeration system.

PROBABLE CORRECTION

2. Reset breaker or replace fuse,
check for electrical fault.

proper operation, and condenser
coil for dirt.

4. Check ice level control circuit.
See page 25.

hot gas valve

liquid line valve, check coil, check
valve operation

4. Defective switch, or liquid line
valve does not open, or low on
refrigerant; check/replace

5. Check/replace TXV.

inlet valve.

find/repair leak. weigh in charge.

water temperatures.

3. Check head pressure, if very
high, and no other reason is
suspected, replace refrigerant
charge.

September, 1993

Page 21

CMS1002R

SERVICE DIAGNOSIS

SYMPTOM POSSIBLE CAUSE PROBABLE CORRECTION

Low ice production 3. High head pressure, a result of a

dirty condenser

4. Hot gas valve leaks thru 4. Replace hot gas valve

5. High air temp. for condenser. 5. If possible, reduce condenser air

No ice falling in bin, unit frozen up 1. Cube size control will not close 1. Check temp. of suction line, cube

2. Timer motor open 2. Replace timer

3. Plug in relay contacts open 3. Replace relay

4. Not enough time during the
harvest cycle to drop all ice

5. Cube size wrong 5. Adjust cube size

6. Hot gas valve restricted. 6. Replace hot gas valve.

7. Not enough water to help harvest. 7. Check for restriction of water

8. Head pressure too low 8. Check pressure control valve.

Ice maker stuck in harvest cycle 1. Relay coil open 1. Replace relay

2. Timer stuck in harvest cycle 2. Check for power to timer motor, if

3. Timer microswitch N.O. contacts
will not close.

Ice is mal-formed 1. Shortage of water 1. Check for restriction of water

2. Evaporator water passages
restricted.

3. Cube size set wrong 3. Adjust cube size control

Water overflows from reservoir into
bin.

1. Restricted sump drain 1. Repair drain

2. Inlet water valve lets in too much
water

3. Clean condenser, check fan
motor

inlet temperature.

size control will not close if temp.
too high. If temp. low enough,
replace cube size control

4. Adjust timer for more harvest time

supply.

Check for low refrigerant charge.

power replace timer, if no power to
timer motor, replace relay.

3. Replace timer.

supply. Check for leak.

2. Clean ice maker.

2. Replace valve

September, 1993

Page 22

SERVICE DIAGNOSIS: Ice Level Control Circuit

Electrical Shock Hazard

Can Cause Personal Injury.
Disconnect Power Before

Servicing.
Bin Thermostat Posts at Line

Voltage.

CMS1002R

CONDITION

Ice Machine does not run, it has
power to it, the high pressure
control is closed, the on/off switch is
set to ON (the compressor will not
operate until the liquid line valve
opens, but the pump should be
working if there is no ice in the bin).

DETERMINE CAUSE

A. Listen for a ticking sound from
transducer.

B. Open bin door and twist
transducer 1/4 turn and pull out.

NOT UNPLUG with power
connected

transducer, the inside must be
clean and dry.

C.

Check power to bin level

. Examine the

control board.

D.

Disconnect electrical power

and test ice machine circuit by
attaching a jumper wire between bin
thermostat posts on circuit board
part no. 12-1912-01 (the circuit
board with the timer on it).
Reconnect power.

E. Transducer or ice level board
assembly defective.

Machine runs, makes ice, switches
on and off, but ice level cannot be
controlled.

Machine runs, but will not shut off. Board relay stuck closed. Check

Ice level switch may be defective.
On boards with a light, check by
moving switch & watching light.

relay,

PROBABLE CORRECTION

If no noise, go to C. If there is a
noise, check for a light on the board
(models built after 4/93). If there is a
light on, check relay contacts N.O.
and COM. The contacts should be
CLOSED. If closed, go to D. If not,
replace the board. If light is off, or
prior model, go to B.

If the inside of the transducer
(above screen) was wet, replace it.

DO

Set bin level to FULL and aim at an
object about 1-3 feet away.
Machine should restart, if not go to
D.

Should be 12 volts from
transformer, if not replace
transformer. If there is power go to
D.

If machine does not start

to machine circuit.

starts, disconnect electrical power,
remove jumper wire and reconnect
electrical power. Then go to E.

Replace transducer. Set bin level to
FULL and aim at an object about
1-3 feet away. Machine should
restart. If this does not repair unit,
replace the board.

Replace ice level switch

If COM and N.O. are closed when
power is off, replace board. If open,
go to B above.

go back

If machine

PARTIAL VIEW

OF CIRCUIT

BOARD

12-1912-01

TIMER

PLUG - IN

RELAY

BIN THERMOSTAT

POSTS MENTIONED IN

“D” ABOVE

September, 1993

Page 23

REMOVAL OF TRANSDUCER

TRANSDUCER

SOCKET

CMS1002R

REMOVAL AND REPLACEMENT

TRANSDUCER

1. Disconnect electrical power BEFORE removing
transducer.

2. Open bin door and locate the transducer socket.

3. Twist inner portion of transducer counter­clockwise and push up gently.

4. Pull transponder down until plug connection is
accessible.

TRANSDUCER

LOCATION

5. Unplug transducer and remove from the
machine.

6. Reverse steps 1-5 to reassemble.

TRANSDUCER

PLUG

CONNECTION

September, 1993

Page 24

REMOVAL AND REPLACEMENT

CMS1002R

/////////////////////////////////WARNING//////////////////////////////
Disconnect electrical power before beginning.
/////////////////////////////////////////////////////////////////////////////////
Water Distributor Tubes And Manifold Tubes

To remove the water distributor tube and manifold
tube:

1. Pull out to unsnap catches and remove the front
panel.

2. Remove the evaporator cover.

3. Slide the water distributor tube to the front about
1/8-inch along the top of the evaporator plate, until
the water distributor tube can be unsnapped from
the flexible notch and lifted upward to the right
side.

4. Unsnap and disconnect water distributor tubes
from the water manifold section. To replace the
water distributor tubes and manifold tubes, reverse
the removal procedure. BE SURE the notches in
the water manifold tubes properly engage the
alignment keys in the tee. BE SURE the water
distributor tube is securely fastened
at the notch at both sides of the
evaporator plate. Check identical
attachment for the left water
distributor tube and notch; also, that
the distributor/manifold connections
at the top center of each evaporator
plate is snug against the top of the
plate.

Cube Size Control

To remove the cube size control:

1. Remove front panel.

2. Remove cover from control box.

3. Trace capillary tube, from the cube size control
to the refrigerant suction line.

4. Remove the coiled capillary tube bulb from the
tube well on the suction line.

5. Remove electrical leads from the cube size
control.

6. Remove screws and the cube size control. To
replace the cube size control, reverse the removal
procedure. Be certain that the bulb is re-insulated.

WATER

DISTRIBUTOR

TUBES

CUBE SIZE

CONTROL

September, 1993

Page 25

INLET WATER

VALVE

INLET WATER

SOLENOID

CMS1002R

REMOVAL AND REPLACEMENT

//////////////////////////////WARNING//////////////////////////////////

Disconnect electrical power before beginning.
//////////////////////////////////////////////////////////////////////////////////
Water Pump

1. Remove front panel.

2. Remove evaporator cover.

3. Unplug water pump electrical connection.

ELECTRICAL

CONNECTION

Inlet Water Solenoid Valve Assembly

To remove the inlet water solenoid valve assembly:

1. Shut OFF water supply to machine.

2. Loosen and remove outlet water line from the
inlet water solenoid valve assembly.

3. Remove screws and pull the water solenoid
valve out to gain access.

ELECTRICAL

CORD

DISCHARGE

WATER

PUMP

REMOVAL OF THE WATER PUMP

HOSE

4. Remove thumb screw retaining pump to cross
brace.

5. Pull pump partially out of reservoir and remove
discharge hose.

6. Remove two nuts holding pump cover to pump
body; separate the two and remove the pump from
the icemaker.

7. Reverse to reassemble.

8. Replace all panels.

9. Reconnect electrical power.

OUTLET

TUBE

REMOVAL OF INLET WATER SOLENOID VALVE

4. Pull electrical cord from solenoid coil terminals.

5. Remove inlet water fitting from the water
solenoid valve. To replace the inlet water valve
assembly, reverse the removal procedures.

September, 1993

Page 26

REMOVAL AND REPLACEMENT

CMS1002R

Head Pressure Control Valve

1. Remove side service panel, and top panel if
possible.

2. Discharge and recover refrigerant from the
system.

3. Break off the process tube on the dome of the
head pressure control valve.

4. Cut out or unsweat the tubing connections to
the valve. Remove the valve.

5. Wrap the new valve in wet cloths or other
effective heat sink material, and sweat the tubing
connections to the valve.

6. Weigh the nameplate charge into the receiver.

7. Replace all panels.

8. Reconnect electrical power.

Hot Gas Valve or Liquid Line Valve

1. Remove the side service panel, and top panel if
possible.

2. Discharge and recover the refrigerant from the
system.

Thermostatic Expansion Valve

1. Remove the side service panel, and top panel if
possible..

2. Discharge and recover the refrigerant from the
system.

3. Locate the TXV sensing bulb on the suction line,
unwrap the insulation and remove the bulb from
the clamp.

4. Cut out or unsweat the old TXV from the tubing
connections.

5. Wrap the new TXV body in wet cloths or other
efficient heat sink material.

6. Re-attach the TXV bulb to the suction line in the
same place as the original. Be certain to
re-insulate the bulb.

7. Sweat in the new valve. Do not overheat.

8. Weigh the nameplate charge into the receiver.

9. Replace all panels removed for service.

10. Reconnect electrical power.

3. Remove the electrical connections from the coil
of the valve

4. Cut out or unsweat the valve at the tubing
connections, remove the valve from the icemaker.

5. Install the new valve, wrap it in wet cloths or
other efficient heat sink material.

6. Sweat the tubing connections to the valve.

7. Connect the electrical wires to the terminals of
the valve coil.

8. Weigh the nameplate charge into the receiver.

9. Replace all panels removed for service.

10. Reconnect electrical power.

September, 1993

Page 27