Commercial Ice Machines Unit 27
Which type of ice maker has a continuous harvest cycle?
Which type of ice is made using a gear motor and auger?
What would be the symptoms of a defective float on an ice maker?
spillage or not enough water
What are the two functions of the dual float switch in an ice flake machine?
shut off alarm, low water
Which part of an ice flake machine is most prone to failure?
List two causes that may lead to auger wobble.
grease leaking out, worn bearings
What is the function of a flush cycle for an ice flake machine?
a way to control unwanted mineral build up
Name and explain three types of ice bin controls in ice flake machines.
mechanical flapper type, sonar, infared
Ice production in an ice flake machine depends mainly on two factors.
water inlet temp and air ambient temp
Explain the function of weep holes on the evaporator of a cell-type ice maker.
relieves suction force and breaks the vacuum
T/F: Stainless steel is often used for evaporators because it is durable, very sanitary, and resist corrosion.
Explain what is meant by ice-bridging in a cell-type ice maker.
the ice cubes are touching each other
Explain the function of a centrifugal pump in ice makers.
pumps city water to the cube maker
What is the function of the ice thickness probe in an ice maker?
What is the most common type of defrost during an ice maker harvest cycle?
Why do ice machines need to be cleaned periodically?
to remove and prevent lime and calcium build up known as scale
Why do ice machines need to be sanitized periodically?
to kill harmful bacteria, viruses, and protozoa
T/F: The same solution can be used to clean and sanitize an ice machine.
What is a common troubleshooting technique used on microprocessors?
input/output troubleshooting
One of the quickest and most thorough ways of obtaining technical service information for an ice machine is through the
Most of the time, the input signals to a microprocessor are
low voltage ac or dc, or resistance signals
A way in which a microprocessor communicates to a service technician about a certain malfunction in the ice machine is by
T/F: Entering air temperature and water temperature are the main factors determining the amount of ice produced in an air-cooled ice machine.
A measurement of the thermal capacity of water is
A build-up of minerals on the evaporator is called
A method for killing bacteria, viruses, and protozoa in ice machines is
T/F: Cleaning with an approved ice machine cleaner is a method of removing scale from an ice machine.
Water conditions can be broken down into three categories. Name these categories.
suspended solids, dissolved minerals and metals, and chemicals.
How do you remove heavy chemicals in the water?
Usually, sand and dirt in water are easily removed by
How does the outdoor ambient effect ice production?
outdoor air above 100F produces less ice
Explain how liquid slug can happen during defrost?
water can migrate to the compressor
Whats the minimum air temperature for an ice machine?
Whats the maximum air temperature for an ice machine?
Whats the minimum water pressure for an ice machine?
Whats the maximum water pressure for an ice machine?
Can you give the same ice machine different voltages?
Whats the clearance around the ice machine and why?
6 inches, the ambient air needs to circulate around the unit
How many water and drain lines are used on an air cooled cuber?
3 lines, water, overflow drain, bin
Do you vent the condenser water drain line for a water cooled condenser?
Can you have more than one evaporator in a cuber?
On a water cooled condenser, how do you adjust the head pressure?
With a newer style cuber, can you adjust the pruge cycle?
When cleaning the evaporator with acid, whats the first thing you do?
dump or remove ice from bin
Whats the total amount of time and procedure for a chemical treatment?
30-45 minutes, apply chemical to the harvest/purge cycle
throttling is when the _____ is starving.
bulb pressure = evap pressure + superheat spring
Bulb pressure is the only thing that will _______ the TXV.
Which direction closes the TXV?
Which direction opens the TXV? |
Ice production in an ice flake machine depends mainly on two factors. name these two factors.
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