Scotsman CU50 Installation guide

CU50
Cube Ice Machine
Scotsman
Technical Training

Major Topics
•Overview
•Installation
•StartUp
•Sequence of Operation
•Maintenance
•Diagnostics
•Service Procedures

Models
•Two Base Models
–GravityDrain
– Pump Drain
•15” wide
•50 lb capacity
•Stainless

Reverse Door Swing
•Remove hinge pin
•Tip door forward, lift off
•Remove hinges
•Switch hinges top to bottom
& left to right
•Place door on bottom pin
•Attach with top hinge pin

Installation Prep
•Remove back panel
•Remove front service panel
•If needed, remove kickplate

Installation – Free Standing Gravity Drain
•Route water supply tubing
to inlet water solenoid valve
•Attach drain tubing to bin
drain hose
– Elbow and hose clamps
•Route drain tubing to
building drain

Installation – Built In Gravity Drain
•Plan the installation for machine removal
– Coil of water supply tubing
– Arrange the drain tubing so it does not kink when the
machine is pushed into place
• Recommended drain tube size is 5/8” ID, 7/8” OD
plastic hose
• Will connect to elbow on machine drain
• Use 2-3 foot section of 5/8” OD copper to guide
drain tube into cabinet while pushing unit back
• Reach back to insert elbow into hose, secure with
clamp

Installation – Built In Pump Drain
•Remove back panel
•Route water supply tubing to
inlet water connection on
solenoid valve
•Route drain hose to building
drain

Water Supply
Route Water
Supply Tubing
¼” Compression
Fitting

Operation – Initial Start Up
•Remove shipping
materials
•Connect water
•Check for leaks
•Connect power
•Push and release the
On / Off button

Sequence of Operation
•Inlet water solenoid valve opens to fill the
reservoir
•Hot gas valve opens to equalize the system
•Compressor, fan and pump start
•Hot gas valve closes, freeze cycle begins
•Freeze cycle continues until evaporator
temperature reaches a preset point - 0, which
triggers a 10 minute (default) timer
•In 10 minutes the Harvest cycle begins

Sequence of Operation - Harvest
•Hot gas valve opens
•Pump and Fan motor stop
•Inlet water valve opens and refills the reservoir
– Fill time varies with evaporator temperature
• Timed during a power restart or in clean cycle
•Harvest continues
– When the evaporator temperature warms to a preset
point – 50, a 20 second (default) timer starts
– When the time expires, harvest ends

Harvest Details
•24 individual cubes per cycle
•Hot gas defrost with a water assist
•Water flows onto top of evaporator platen to
– Warm up the platen & obtain a faster harvest
– Remove heat from the water for the next cycle

Control System
•Electronic controller
– 12 volt power supply
– Evaporator thermistor
– Water quality sensor
– Bin thermostat
•Operates
– Compressor
–Pump
– Fan motor
– Hot gas valve coil
– Inlet water
solenoid valve coil

Mechanicals
Curtain
Bracket
Fastener
Curtain

Controller
Hi Voltage
Connector
Power
Supply
Connector
Evaporator Thermistor
Water Sensor
Bin Thermostat
Control Panel Ribbon Cable
Power
Comp
Water
Hot Gas
Fan

Controls
On – Off Button Green when set
to ice making Blinks Red if out
of water Yellow if its been 6
months since it was
cleaned
Used in
cleaning
process

Control Operation – Check Water
•Red blinking light indicates a lack of water
•Water must fill reservoir within 2 minutes
•Unit automatically re-tries filling the reservoir every 20
minutes

Control Details
•Maximum freeze time: 60 minutes
– Automatically harvests after 60 minutes of freeze
•Maximum harvest time: 6 Minutes
•Time between restarts: 4 minutes
•Power interruption restart:
– Timed harvest cycle to clear ice

Control Details – Water Sense
•Water conductivity varies by mineral content
– More minerals = more conductivity
•Control system senses conductivity, varies water
use to rinse more water if there is high
conductivity, reducing mineral build up potential
•System is able to sense very clean water, such
as RO water to 10 microSiemens/cm of
conductivity