Scotsman CU50GA1A User Manual
CU50
Service Manual
Introduction:
This ice machine is the result of Scotsman’s
decades of experience as an industry leader in the
design and manufacture of both commercial and
residential ice machines.
This manual includes the information needed to
install, start up, maintain and service the ice
machine. Note any Caution or Warning indicators,
as they provide notice of potential hazards. Keep
this manual for future reference.
Table of Contents
Specifications .......................................... Page 2
Cabinet Layout ......................................... Page 3
Air flow ............................................. Page 4
Water Quality .......................................... Page 5
Door Covering .......................................... Page 6
Door Panel Attachment ..................................... Page 7
Custom Panel .......................................... Page 8
Door swing change ....................................... Page 9
Installation: Water & Drain ................................... Page 10
Gravity Drain .......................................... Page 11
Electrical ............................................ Page 12
Cube Size Adjustment ..................................... Page 13
Harvest Time Adjustment .................................... Page 14
Control Settings ......................................... Page 15
Use ............................................... Page 16
How to clean the condenser and winterize. ........................... Page 17
How to remove scale from the ice making system. ....................... Page 18
System Information ....................................... Page 19
Water System .......................................... Page 20
Components .......................................... Page 21
Controller ............................................ Page 22
Performance Information .................................... Page 23
Refrigeration System ...................................... Page 24
Thermistor Values ........................................ Page 25
Service Diagnosis ........................................ Page 26
Service Diagnosis ........................................ Page 27
Removal and Repair ...................................... Page 28
Removal and Repair ...................................... Page 29
Removal and Repair - Cabinet Removal ............................ Page 30
Refrigeration Service ...................................... Page 32
March 2010
Page 1
CU50
Service Manual
Specifications
This ice machine is designed to be used in a
controlled environment. It can be used in a wide
variety of environmental conditions and under
limited conditions (see user manual), outdoors, but
there are limits. Use outside of the listed limitations
is misuse and will void the warranty.
Air temperature limits:
The ice machine will operate adequately within the
limits, but functions best in temperatures between
70 and 80 degrees F.
Minimum – 50 degrees F. (10oC)
•
Maximum – 100 degrees F. (38oC)
•
Water temperature limits:
Minimum – 40 degrees F. (4.5oC)
•
Maximum – 100 degrees F. (38oC)
•
Water pressure limits:
Minimum – 20 psi (1.4 bar)
•
•
Maximum – 80 psi (5.5 bar)
Options:
Kickplate Extension
levelers will be extended enough to become visible.
A kit to extend the kickplate over the legs is KKPF.
Cabinet Stability
installations it may be prudent to add a bracket that
secures the back of the cabinet to a wall. That kit
number is KATB.
Drain Conversion:
A gravity drain model can be converted to a drain
pump model by installing a drain pump kit. The
drain pump kit consists of a drain pump, wiring
harness and associated tubing. The kit number is
A39462-021.
Warranty Information
Warranty information is supplied separately from
this manual. Refer to it for coverage. In general, the
warranty covers defects in materials or
workmanship and does not cover corrections of
installation errors or maintenance.
: In some situations the leg
: In some free standing
Because the ice machine is making a food product,
the water supply to the ice machine must be
potable, or fit for human consumption.
Electrical
•
115 volt, 60 Hz. Plug into dedicated 15 amp
circuit.
•
Power consumption: 275 - 400 Watts. Varies
during Freeze and Harvest cycles.
Voltage limits:
•
Minimum - 104 volts
•
Maximum – 126 volts
Models: There are two models, all air cooled:
•
CU50PA-1 – Pump model
•
CU50GA-1 – Gravity drain model
March 2010
Page 2
CU50
1.00
LEG
ADJUSTMENT
[25.40]
14.88
377.95
AIR OUT AIR IN
3.88
98.55
17.45
443.23
FLOOR DRAIN
AC CESS HOLE
34.38
873.25
3.85
97.79
29.66
753.24
22.29
566.17
23.89
606.68
1.60
40.51
3.20
81.28
3.27
82.99
2.44
62.04
1.57
39.75
7.44
188.98
3.83
97.16
115V
PO WERCORD
PO TAB LEWATER INLET
1/4"COMPRESSION FITTING
DRAIN
FLEXIBLETUBING
3/8 I.D.PUMP MODEL (INCLUDED)
5/8 I.D.GRAVITY MODEL (NOTINCLUDED)
Service Manual
Cabinet Layout
March 2010
Page 3
CU50
Service Manual
Air flow
The machine takes in room temperature air at the
lower right front and forces warm air out the lower
left front. Restricting the airflow will adversely affect
the ability of the ice machine to make ice.
Control Panel
Warm Air Out
Scotsman Ice Systems are designed and
manufactured with the highest regard for safety
and performance. They meet or exceed the
standards of agencies like U.L.
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 parts and/or other components not
specifically approved by Scotsman.
Air Intake
Ice Making
Area
Scotsman reserves the right to make design
changes and/or improvements at any time.
Specifications and designs are subject to change
without notice.
March 2010
Page 4
CU50
Service Manual
Water Quality
All water, including potable water supplied by
municipalities, contains some impurities or
minerals. Water absorbs impurities from the air as
rain and/or as it flows through the ground. Some of
the impurities are solid particles, these are known
as suspended solids, and a fine particle filter will
remove them. Other impurities are chemically
bonded to the water molecules, and cannot be
filtered out, these are called dissolved solids.
Ice made by this machine will have a lower mineral
content than the water it was made from. This is
due to the method of making ice. Purer water will
freeze first in the ice making molds. The reason for
this is that anything dissolved in water lowers the
water’s freezing temperature. This concentrates
most of the impurities in the ice machine water
reservoir where they may form hard deposits
known as scale. The machine dilutes the
concentration of minerals by over-filling the
reservoir during the harvest cycle (with the excess
water flowing down the drain). Between 2 and 4
pints of water flow into the unit each cycle.
Between 1 and 3.5 pints of that rinses the reservoir
and goes down the drain.
Some impurities will inevitably remain, and will stick
to the parts in the machine, and will cause
malformed ice cubes. Eventually, built up mineral
scale can shorten machine life.
Filters and Treatment
In general, it is always a good idea to filter the
water. A water filter, if it is of the proper type, can
remove taste and odors as well as particles. Some
methods of water treatment for dissolved solids
include reverse osmosis, and polyphosphate
feeders.
RO Water
This machine can be supplied with Reverse
Osmosis water, but the water conductivity must be
no less than 10 microSiemens/cm. A reverse
osmosis system should include post treatment to
satisfy the R.O. water’s potential aggressiveness.
Deionized water is not recommended and is too
clean to allow the machine to function.
Because water softeners exchange one mineral for
another, softened water may not improve water
conditions when used with ice machines. Where
water is very hard, softened water could result in
white, mushy cubes that stick together.
If in doubt about the water, contact a local point of
use water specialist for recommendations on water
treatment.
Installation Overview
To keep the machine operating properly, these
impurities or minerals will have to be regularly
dissolved by an acid cleaning, using Scotsman Ice
Machine Scale Remover. Directions for this may be
found in the section under cleaning.
March 2010
Page 5
The ice machine must:
•
be connected to cold, potable water
•
be connected to a drain
•
be connected to the proper power supply
•
be able circulate air through the vents at the
front.
Note: Do not build in so that the door is recessed.
CU50
Service Manual
Door swing change
The door can be attached to open with hinges on
the left or right. Retain all screws for re-use.
To change:
1. Remove top hinge pin from hinge.
6. Remove original bottom hinge.
7. Remove two plugs or screws from upper
cabinet bracket.
8. Attach bottom hinge to upper cabinet bracket
using the original screws.
2. Tilt top of door away from cabinet and lift door
off bottom hinge.
3. Remove two screws and top hinge.
9. Place the door on bottom hinge, tip up to slide
under top hinge.
10. Insert hinge pin into top hinge and door.
11. Tighten hinge pin.
12. Replace screws or plugs into holes left by
hinges.
13. Check action and swing of door.
4. Remove plugs or screws from lower cabinet
bracket
5. Attach top hinge to lower cabinet bracket using
original screws.
March 2010
Page 6
CU50
Service Manual
Installation Notes
Sealing to floor: In some cases the base of the ice
machine must be sealed to the floor to meet local
code. Food grade silastic sealant such as
Scotsman part number 19-0529-01 is
recommended.
Place the machine in the intended location. Turn
the leg levelers in until the bottom of the unit is as
close to the floor as possible. Be sure the unit is
level and all four levelers are in contact with the
floor.
Place a bead of the sealant between the floor and
the outside edge of the cabinet. The bead must fill
the space between the cabinet bottom edges and
the floor.
Built In Situations: If a finished floor is to be
installed in the area after the ice machine has been
built in, shims the expected thickness of the floor
should be installed under the unit to keep the
machine level with the planned floor level.
Installations on a slab: Use a pump model and
pump the water to the point of drainage. Pump
models will pump 1 story (10 feet) high.
Installations over a crawl space or basement:
Either gravity drain or pump model units may be
used, if there is not enough room behind the
machine for a drain/waste receptacle, the drain will
have to be below the floor.
Note: When installed in a corner, the door swing
may be limited due to handle contact with the wall
or cabinet face.
March 2010
Page 7
CU50
Service Manual
Installation: Water & Drain
The recommended water supply tubing is ¼ inch
OD copper. Stainless steel flex or reinforced PVC
tube may also be used. Install an easily accessible
shut-off valve between the supply and the unit. This
shut-off valve should not be installed behind the
unit.
Note: Do not use self-piercing type valves.
1. Remove the front service panel.
Screw
Securing
Front Service
Panel
Drains
There are two types of ice machine models, one
that drains by gravity and one that has an internal
drain pump.
Drain Pump Model drain installation
1. Locate the coil of 3/8” ID plastic drain tubing
secured to the back of the unit.
2. Route the plastic drain tube from the back of the
unit to the drain connection point.
IMPORTANT NOTE: Often an air gap is required by
local codes between the ice maker drain tube and
the drain receptacle.
2. Route the tubing through the right hole in the
back to the inlet water solenoid valve inlet.
3. Install a compression fitting on the tubing and
connect to the inlet of the solenoid.
Drain Tube,
Route to
building drain
Water Inlet
Tube (field
supplied)
Back View, Drain Pump Model
March 2010
Page 8
CU50
Service Manual
Gravity Drain
Caution: Restrictions in the drain system to the
machine will cause water to back up into the ice
storage bin and melt the ice. Gravity drain tubing
must be vented, have no kinks and slope to the
building drain. Air gaps are typically required by
local code.
1. Place the ice machine in front of the installation
opening. Adjust leveling legs to the approximate
height.
2. Remove the front service access panel and the
upper back panel.
Note: If you are connecting a gravity drain model
and the drain opening has been located in the floor
under the base pan according to the pre install
specifications, follow steps 3 through 5 to drain the
unit through the base. If not, proceed to step 6b.
3. Remove the clamp and barbed elbow and take
off the plastic cover in the base pan below the drain
hose.
4. Connect a straight 5/8” barbed connector to the
drain hose, securing with the clamp removed in
step 4.
5. Cut an 8” piece of 5/8” ID X 7/8” OD tygon (clear
plastic) tubing. Slide one end of the tube onto the
outlet of the barbed connector and secure with a
clamp. Leave the other end of the tube lying on the
floor of the base pan until the unit is positioned
over the floor drain.
6. Route the drain tube. Either a) Insert the drain
tube through the base pan into the floor drain or b)
Route the drain tube through the left hole in the
lower back panel and connect to barbed elbow and
secure with a clamp.
7. Reinstall the upper back panel.
8. Reinstall the service access panel. Level the
unit.
Drain Hose
Drain Hose,
Route to
building drain
Barbed Elbow
Water Inlet
Tube (field
supplied)
Back View, Gravity Drain Model
March 2010
Page 9
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