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Technicians Only: Harvest Cycle Sequence & Other Notes

Harvest

The Purge Valve will be open for 40 seconds.
The water pump shuts off, it will restart before 40

seconds, the restart time is based on the Purge

Level Setting.
The pump restarts and pumps water out of the

reservoir until the purge valve closes.
The inlet water valve will stay on for about 30

seconds to add enough water to assist with

harvest.
The Hot Gas Valve will be open for the entire

length of the Harvest Cycle.
The Harvest Bypass Valve will be open for a few

seconds (between 4 and 12, depending upon

discharge temperature) at the beginning of the

Harvest Cycle.
During the Harvest Cycle, ice will be falling from

the evaporators and between the ice sensor’s

electric eyes. The AutoIQ Controller monitors the

ice falling and uses that information to determine

the next harvest cycle length.
The first Harvest after a restart will take about 6

minutes to establish a base line, then the time it

took to release that ice is used to determine the

next harvest cycle’s length.
The maximum harvest time is 14 minutes.
If no cubes fall (or are sensed) by the end of the

Maximum Harvest Time, the machine senses a

Refrigeration error. If the next cycle also produces

a Refrigeration error, the machine will shut down.
Note: The last Harvest cycle before shutting off on

Bin Full will be about 6 minutes long.
Note: The machine will not restart for 4 minutes

after switching off on Bin Full, unless the Freeze

button is pressed.
Bin Full: The controller will switch on the

compressor for 30 seconds after 25 hours of off

time to keep refrigerant out of the compressor oil.
Continuous Run Time
A unit that operates 24 hours a day 7 days a week

is too small for the user’s needs. To maintain

harvest integrity, the controller will extend the

harvest time to 6 minutes every 15th consecutive

harvest cycle.

Bin Thermostat:

In normal ambients the thermostat will react to ice

on the bulb in a few seconds. Reaction after

removal will take about a minute under normal

conditions, and longer in colder rooms.

Diagnostic Light Code Table

If a Diagnostic

Light

Water Light

Refrigeration

Light

Blinks once and

repeats

Water pump will

not start

Very long ice

harvest

Blinks twice and

repeats

Lack of water fill No harvest of

ice

Blinks three

times and

repeats

not used

High Discharge

Temperature

Is ON all the

time

Water valve

leaking thru

rapidly

Check for low

discharge

temperature or

long freeze

cycle

Both ON all the

time

Check for thermistor set unplugged

or failed

Note: Diagnostic lights remain on until the

controller is manually reset or until it successfully

restarts the machine.

CME456R

December 2000

Page 22

Содержание CME456R

Страница 1: ...ge 6 For The Installer Remote Condenser Page 7 Remote Condenser Location Page 8 Coupling Instructions Page 9 Fan Relay Kit Page 10 Electrical Page 11 Plumbing Page 12 After Utility Connections Page 13 Component Location and Function Page 14 AutoIQ Controller Page 15 Initial Start Up Page 16 Adjustments Page 17 How To Operate The AutoIQ Controller Page 18 How The Electronic Cuber Works Page 19 How ...

Страница 2: ...arts and or other components not specifically approved by Scotsman Bins Designed to fit a standard 22 wide or wider open top Scotsman Ice Storage Bin Some examples are BH360 Direct Fit HTB555 use KBT27 Bins with short or no baffles require the addition of thermostat kit KSTAT 22 to lower the ice level Dispensers ID150 Add adapter kit KBT42 HD22 Direct fit Condensers Single Circuit 60 Hz ERC111 1 D...

Страница 3: ... Machine Layouts Bin Stat Bracket Mounting Holes Bin Stat Thru Hole Plan View Ice Opening 22 00 in 55 9 cm 3 75 in 9 5 cm 12 88 in 32 7 cm 4 00 in 10 2 cm 8 75 in 22 2 cm 2 63 in 6 7 cm 11 38 in 28 9 cm 1 25 in 3 2 cm 1 75 in 4 4 cm 16 7 in 42 4 cm ...

Страница 4: ...heck with a water treatment service for a recommendation Cube Ice machines use more water than what ends up in the bin as ice While most water is used during ice making a portion is designed to rinse out the water system to keep hard water scale from clogging up the machine That water rinse combined with water filters prolongs the times between needed water system cleaning Service Technicians All ...

Страница 5: ...o the bin with food grade sealant Level the top edge of the bin front to back and left to right If the ice machine has not been unpacked do so now Remove the carton from the skid Remove shipping straps Remove the front panel and all packaging materials After all packing materials have been removed from the ice machine lift or hoist the machine onto the bin Align the sides and back of the machine w...

Страница 6: ...nd to controller 4 Locate bin thermostat bracket 5 Carefully position the thermostat bulb on the bracket 6 Fasten the bracket to the bottom of the ice machine with the two 3 pronged knobs supplied with the unit 7 Pull excess capillary tubing into the machine 8 Return the baffle to the bin and continue with the installation Note If the machine is located at an altitude higher than 2 000 ft adjust t...

Страница 7: ...ds of each line have quick connect couplings the end without access valves goes to the ice maker 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 2 Check local codes a separate hole may be required for the electrical powe...

Страница 8: ...s Rise s Horizontal Run dd rd hd Calculated Line Length Configurations that do NOT meet these requirements must receive prior written authorization from Scotsman Do NOT Route a line set that rises then falls then rises Route a line set that falls then rises then falls Calculation Example 1 The condenser is to be located 5 feet below the ice machine and then 20 feet away horizontally 5 feet x 6 6 3...

Страница 9: ...hat the threads are properly engaged 4b Using two wrenches one to rotate the swivel nut and one to hold the tubing in place tighten each coupling It is CRITICAL that ONLY the NUT on the pre charged tube be turned or the diaphragms will be torn by the piercing knives and become loose in the refrigeration system causing severe operational problems Note As the coupling is tightened the diaphragms in ...

Страница 10: ...nnected properly the relay will fail in a cycle or two and there may be an electrical overload A Before initial start up Compare the illustration of the KCMR120 terminal strip to the connections at the KCMR120 Terminals 1 and 3 must be connected to a common leg such as L1 Terminals 2 and 4 must be connected to a common leg such as N B After initial start up test with a volt meter compressors must ...

Страница 11: ...ion box Note Central Condensers connected to more than one refrigeration system will likely have a wiring scheme to control the fan motor Follow those directions for condenser wiring Electrical connections are made in the junction box in the back of the cabinet 1 Remove the junction box cover 2 Knock out both holes for a field supplied strain relief 3 Install wires and strain reliefs per code Note...

Страница 12: ...filter manufacturer When replacing a prior ice machine do NOT assume that the water flow capacity of the filter will be adequate All Drain Tubing Material must be RIGID Flexible tubing will eventually cause a restricted drain Drain All models have 1 gravity drain connection a 3 4 FPT fitting at the back of the cabinet Use only RIGID TUBING Flexible tubing may be easily kinked or become cracked The...

Страница 13: ...y connections been properly made with the correct size tubing ___ 5 Have all the drain connections been properly made ___ 6 Has the unit been leveled Level the unit at the bin ___ 7 Have all unpacking materials been removed ___ 8 Is the water pressure adequate ___ 9 Is the machine secured to the ice storage bin ___ 10 Is the bin control system been properly installed ___ 11 Have the drain connecti...

Страница 14: ...additional refrigerant into the harvest system Water Pump Forces the water from the reservoir to the top of the evaporator s The motor is kept separate from the water to minimize contact with moisture Hot Gas Valve Closed during freeze it opens during harvest to divert hot discharge refrigerant gas into the inlet of the evaporators Purge Valve Opens during the first part of harvest when the water ...

Страница 15: ...The compressor remote fan motor and water pump are ON Harvest The refrigeration and water systems are operating to harvest the ice cubes While the compressor and fan motors are on for the full cycle the water pump will be off at the beginning and the inlet water valve will switch off before the end Clean Water valve opens to fill the reservoir The Water pump starts The Clean indicator light is swi...

Страница 16: ...valve closes The Inlet water valve will open for a short time The Bin Full indicator light will go on and off as ice falls from the evaporators 8 Machines are shipped from the factory with the purge level set to accommodate average water conditions To achieve optimal machine performance set the purge level to the minimum setting Note While the amount of water purge is adjustable only those install...

Страница 17: ...ds then release it This switches the machine Off 2 Push and hold the OFF button for more than 3 seconds just until all Lights flash on then release it Do not hold it in it too long 3 Examine the green Lights They should have all flashed once then certain ones will have turned on to indicate which purge level the machine is set at There are 5 levels of purge available 1 Maximum Purge is when All 5 ...

Страница 18: ...Clean Button Pushing and releasing this button will cause the machine to empty the reservoir refill and leave only the water pump on for circulation of ice machine cleaner After the ice machine cleaner has circulated for about 10 minutes a second push of this button will switch on the rinsing system to flush out the dissolved scale and ice machine cleaner 4 Off Button Pushing and releasing this bu...

Страница 19: ...essor through the check valves to the evaporator inlets At the same time a Harvest Bypass Valve opens for a few seconds to add the refrigerant needed for harvest After that the Harvest Bypass Valve and the closed Discharge Check Valve keeps the refrigerant in the condenser out of the Hot Gas Circuit This warms up the evaporators and the surface of the ice frozen to the evaporator surface melts Ice...

Страница 20: ...f the next freeze cycle The AutoIQ Controller operates the ice machine by monitoring several input measures and switching various loads on and off Controller Inputs 1 Reservoir water temperature This is measured by a thermistor located in the water pump outlet 2 Discharge line temperature This is measured by a thermistor located on the compressor discharge line 3 Water level This is measured by an...

Страница 21: ...e AutoIQ Controller then measures how long it takes to lower the water level If the water level does not fall the machine Shuts Down on a Water Error 7 Once per freeze cycle the machine will shut off the water pump It only does this when the water temperature reaches a preset minimum The pump will only be off for a few seconds 8 As the machine makes ice the water level in the reservoir will ultima...

Страница 22: ...geration error the machine will shut down Note The last Harvest cycle before shutting off on Bin Full will be about 6 minutes long Note The machine will not restart for 4 minutes after switching off on Bin Full unless the Freeze button is pressed Bin Full The controller will switch on the compressor for 30 seconds after 25 hours of off time to keep refrigerant out of the compressor oil Continuous ...

Страница 23: ...ter stops flowing in lift sump cover and pour 24 ounces of Scotsman Ice Machine Cleaner into the reservoir water Return the sump cover and freezing compartment cover to their normal positions 14 After the ice machine cleaner has circulated for 10 minutes push and release the Clean button This starts the rinsing process The Clean indicator light will be ON Note The rinse process flushes any residua...

Страница 24: ...and a plastic bristle brush 7 Examine the water distributors Although they are made of a material that is resistant to mineral build up some may be present Soak or scrub the distributors in or with a solution of Scotsman Ice Machine Cleaner and warm potable water 8 Return the water distributors to their normal installed position 9 Push and release the clean button to flush the water system 10 Afte...

Страница 25: ... inlet fitting and remove valve from machine 8 Examine the inlet screen if dirty brush off screen Note Screen is not replaceable and may only be removed by taking off the covering bracket The bracket forms part of the inlet water system and must be water tight to the valve body removal is not recommended 9 Reverse to reassemble To drain reservoir if desired 1 Remove front panel 2 Push and hold the...

Страница 26: ...ild up They may be wiped clean with ice machine cleaner to assist in removal of the build up Note Do NOT use abrasive materials or cleaner on the ice sensor lenses A soft toothbrush works well to get into the hard to reach spots 8 Reverse steps 1 6 to reassemble To Clean the Remote Air Cooled Condenser 1 Disconnect and lock out the electrical power 2 At the remote condenser check for loose debris ...

Страница 27: ... and everything else is OK replace the water level sensor Unit is off on a Refrigeration Error Low discharge or long freeze cycle Check refrigeration Light If the Light is glowing there is a probable refrigeration problem fan motor could have failed Harvest problem Check refrigeration Light If the Light blinks once and repeats look for a harvest problem where some cubes were sensed Check refrigera...

Страница 28: ...leak in reservoir Check for a leak thru the purge valve Low ice capacity Dirty condenser Clean condenser Recirculation of air Block air re circulation or move condenser Low refrigerant charge Check system If there is a low charge find the leak recover the refrigerant repair the leak replace the dryer evacuate and weigh in the nameplate charge Too much water Check for inlet water valve leak thru Un...

Страница 29: ...ions if ok replace AutoIQ Controller Hot Gas Valve leaks thru warm tube temperatures on both sides of valve during freeze Mechanical problem in valve Replace valve Water Inlet Valve does not open Open solenoid coil Replace valve Stuck valve Replace valve No power to valve best checked at the beginning of Freeze Check wire connections if ok replace AutoIQ Controller Water Inlet Valve does not flow ...

Страница 30: ...motor Clean the condenser repair the fan motor Extreme hot location Relocate the cabinet Extremely hot condenser location Move condenser or provide shade Overcharge of refrigerant Recover evacuate and weigh in the nameplate charge Hot gas valve leaks thru unit off on refrigeration error At the end of the freeze cycle there should be a definite difference in temperature between the inlet and outlet...

Страница 31: ... In 350 PSIG Headmaster Valve Setting is 217 PSIG CME456R December 2000 Page 31 70o F condenser air 70o F indoor air 55o F water 90o F condenser air 90o F indoor air 70o F water Suction End of Freeze 30 to 36 PSIG 34 to 38 PSIG Suction Peak in Harvest 75 to 85 PSIG 80 to 90 PSIG Discharge 5 minutes into Freeze 225 to 235 PSIG 230 to 240 PSIG 70o F condenser air 70o F indoor air 50o F water 90o F c...

Страница 32: ...rness from purge valve coil 4 Locate and remove the two screws securing the purge valve to the machine 5 Pull the inlet and outlet hoses off the purge valve and remove it from the machine 6 Reverse to reassemble There are no internal parts available for this valve Purge Valve Timer The purge valve timer is sensitive to electrostatic discharge Be certain to touch a grounded surface before touching ...

Страница 33: ...o the cabinet 9 Switch on the electrical power All Lights should lite up 10 Push and release the Freeze button 11 Replace the front panel Electric Eyes Ice Sensors These must be replaced as a set 1 Remove front panel 2 Push and release the Off button 3 Remove evaporator cover 4 Remove cascading shield 5 Locate the front and back ice sensors Each has a rectangular tab that was holding the cascading...

Страница 34: ... to the controller they are plugged into 5 with the water temperature sensor and must be replaced with it 6 Reverse to replace be sure that the discharge line sensor is 6 up from the compressor discharge port The discharge line sensor is marked with yellow tape Note Route wires so they do NOT contact the discharge line Water Temperature Sensor Note This sensor is replaced as a set with the Dischar...

Страница 35: ... 300 microns Charging 1 Use an electronic scale to measure the charge 2 Place a drum or cylinder of R 404A on the scale in position to dispense liquid refrigerant 3 A refrigeration manifold is assumed to be attached to the service access valves Attach the charging hose to the cylinder of R 404A Open the cylinder s valve and purge the hose to the manifold 4 Be sure that the low side access valve is...

Страница 36: ...should start in a few minutes To Manually Reset the machine 1 Remove the front panel 2 Locate the AutoIQ Controller If a red diagnostic light is glowing note which one and its blink rate Then push and release the off button 3 Push and release the Freeze button 4 The machine should begin to operate If there is a lack of water it will soon shut off again 5 Return the front panel to its normal positi...

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