Question about Scotsman CSW45 15" Ice Maker with 26 lb. Ice Storage Capacity, 44 lb Ice Production per Day, Drain R...

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Ice machine goes into a pump down during a freeze cycle but not all the time, so i change out the txv, thought it was sticking. still occuring. i was getting a pump down with very high superheat. then tech support told me low refrigerant charge but wouldn't happen all the time. then they told me that the headmaster might be bad, or both. any ideas.? right now it running for now.

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Check the electrical connections to the solenoid valves they might be dropping out at times. you have a high superheat due to the starvation to the evaporator.

Posted on Feb 21, 2009

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1 Answer

WHY scotsman iec machine shuts down on the refridgeration light ON CM3 CONT


Is the machine producing ice thick enough to come off the evaporator plate? the machine will try to harvest 3 times before it locks out on long harvest. Harvest cycle: The compressor and hot gas valve are both powered during the harvest cycle. The fan and pump are off at this time. The machine stays in the harvest cycle until the evaporator thermistor senses 52 DEG F. If the bin is not full, the unit goes into another freeze cycle. I would check the Thermistor

May 28, 2014 | Scotsman CSW45 15" Ice Maker with 26 lb....

1 Answer

Low ice output


Low ice production has multiple causes. First check condensing coil to see if they are dirty and not passing air. This is the most probable cause for low ice production. Next, measure freeze cycle time and harvest time. Freeze time is typically 20 to 30 minutes and harvest time is normally 1.5 to 3 minutes. If freeze time is long (> 35 minutes), first check water valve shuts after reservoir is full. If it does not shut off the water solenoid operated valve needs replaced. Second, find the harvest solenoid operated valve which branches off the compressor discharge and port high temperature gas into evaporator during harvest and see that evaporator side of harvest valve cools down to surrounding temperature in a few minutes 8 - 10 after freeze cycle starts and harvest time stops. If it does not cool off the valve is leaking by its seat and will require a technician to replace. Lastly, if long freeze cycle could be due to low refrigerant and will require and tech to charge properly. Ice machine are critically charged and a tech will know how to charge the right amount. Again, it is possible the metering device is not passing enough refrigerant and a technician can determine this by checking the superheat and subcool. Low subcooling <3 and a high superheat >20 typically indicate an txv (metering devise) needs replaced and will require a tech to replace.

Oct 13, 2013 | Scotsman Ice Machine - 290lb...

1 Answer

Ice machince is going max freeze cycle shut down


1. Possible cause. Water leak. Check purge valve, water curtain, sump, sump hose.
2. Air filters clogged. Clean air filters.
3. Dirty condenser. Clean condenser.
4. Restricted location, intake air to hot. Have machine moved.
5. Ice thickness sensor dirty or disconnected. Check ice thickness sensor probe.
6. Water distributor dirty. Remove and clean water distributor.
7. Inlet water valve leaks through during freeze cycle. Check water inlet valve.
8. Connected to hot water. Check for bleed through from missing check valve in building water supply.
9. Incomplete harvest. Check harvest system.
10.High pressure cut out opened. Check fan motor pressure control, check fan motor, check controller using test mode.
11. Fan motor pressure control open. Check fan pressure control.
12. Fan motor not turning. Check fan motor, check fan blade,check controller using test mode.
13.Water pump not pumping. Check pump motor,check controller using test mode.
14. Pump hose disconnected. Check hose.
15. Compressor not operating. check compressor contactor, check controller using test mode.
Check compressor start components, check PTCR resistance and temperature, check compressor voltage, check compressor windings.
16. Low refrigerant charge. Add some refrigerant and restart unit. If cycle time imporves, look for a leak.
17. Hot gas valve leaks through during freeze. Check hot gas valve for hot outlet during freeze.
18. Thermostatic expansion valve bulb loose. Check bulb.
19. Thermostatic expansion valve producing very low or high superheat. Check evaporator superheat, Change TXV if incorrect.
20. Compressor inefficent. Check compressor amp draw, if low and all else is correcy, change compressor.

Sep 28, 2013 | Scotsman Ice Maker CM3 30inW Cubed Ice...

2 Answers

Hoshizaki km1300maf


Replacing restricted TXV Hoshizaki Ice machine!

Jul 07, 2013 | Hoshizaki Freezers

1 Answer

My manitowoc series 420 has a code telling me the compressor discharge temperature


Which code is that? I don't see that in the service manual. There is an E09 that indicates that during the first six minutes of freeze the discharge temperature was below the average of the last 6 cycles. I have searched from E01 to E31 and don't see the code you indicate but I would say you either have a low refrigerant charge, a flooding TXV that is allowing too much refrigerant flow into the evaporator and not allowing enough flow to be diverted into harvest, or a weak compressor. Reset the unit and check the temperatures on the display while its running and time a freeze cycle. Should take about 15 minutes to make ice.

Jun 28, 2013 | Manitowoc ID-0452A 420 Lb Full Size Cube...

1 Answer

Scotsman ice maker cme 506 makes ice and turns off and blinks refrigeration


First check to make sure condenser fan is running during freeze cycle. Now check to make sure condenser coil is clean. Her is all the specks on the machine.
1. Ice production ( 500 at 70/50
2. BTUs per hour ( 7000)
3. Maximum times in Minutes. ( 50 freeze, 14 harvest.
4. Refrigerant charge ( R-404A ) ( A-D series: AC 32oz, WC 20 oz. E series AC 23 oz, WC 14 oz, F series AC 23 oz, WC 13 oz
5. Suction pressure ( PSIG ) 35-37 - end of freeze, 120-125-Peak in harvest.
6. Discharge pressure ( PSIG ) 240-260- 5 min in freeze.
165-175- minimum in harvest.
7. Metering device.( TXV plus distributor, E series and higher have two TXVs. superheat 3 to 15 deg F.
8. Average comp.amps. 10-11 during freeze, 11-12 during harvest.
9. Batch Weight. 6.5-7 lb
10. cycle time, 23 minutes @ 90/70. 19 minutes @ 70/50

Feb 24, 2013 | Scotsman Ice Maker CM3 30inW Cubed Ice...

1 Answer

I am working on a manitowoc qd452a ice machine, for a friend of mine. The problem it is making no ice at all. the coils have been brushed and filter cleaned. when i hook up my gauges the low side will...


Is the dump valve closing all the way and is the water valve letting in water and warming the water up.....during the freeze cycle. Is any of the coil getting cold. If only half of the coil is getting cold and the other not then I would add some freon..... Hope this helps

Mar 04, 2011 | Kitchen Ranges

1 Answer

I hooked a used unit up turned it on and got 3 beep any answers


this indicates that the backup freeze timer terminated the freeze cycle. Stayed in freeze cycle 60 minutes. Causes can be: stuck float switch, water valve leaking incoming water, and the more extreme can be hot gas valve leaking, txv not feed properly, low refrigerant charge, or bad compressor. Usually one of the first 2 items are the root cause.

Aug 21, 2010 | Hoshizaki Freezer Commercial Ice Machines...

3 Answers

Hoshizaki Ice Machine Model KM-500MAF


(Quated From Hoshizaki Technical Bulletin)
An alarm code of 3 beeps
every 3 seconds means that the control board has shut
down on the 60 minute freeze cycle back up timer.

The “E” control board has a 60 minute timer that starts at
the beginning of the freeze cycle. If the float switch fails
to open and start the next harvest within 60 minutes, the
board will automatically start the harvest cycle. If this
occurs in two consecutive cycles, the control board will
shut the unit down on the manual reset, freeze cycle
back- up timer. The yellow fault LED marked “60 min.”
will illuminate. This safety is designed to help prevent a
freeze up of the evaporator.

Once you have identified the 60 minute alarm, there are
several things to check. Reset the alarm by depressing
the white reset button to the right of the fault LED’s.
This must be done with the power “ON”. Now check the
float switch to see if it is stuck in the up position. A stuck
float can occur if scale is present on the reed switch
shaft inside the housing. To check it, drain the water
reservoir, unplug the black float switch connector (K5)
from the control board and check it with an ohm meter
for a closed switch (zero ohms). If the float switch is
sticking, clean it with ice machine cleaner or replace it as
necessary.
An inlet water valve which is slowly leaking by during the
freeze cycle can cause a 60 minute alarm. If the inlet
water valve is stuck wide open, it is unlikely that any ice
will form on the evaporator. Check for a slow leak by
allowing the unit to cycle into the freeze cycle and
disconnecting the hose at the outlet of the water valve. If
water leaks by during the freeze cycle, the water valve
diaphragm is likely damaged or the small diaphragm bleed
port is clogged with scale. Clean the bleed port or replace
the diaphragm or entire water valve as necessary.

(I Recommend to get a refrigeration tech for this part).

Another possibility is a refrigeration system problem. You
should use normal refrigeration diagnosis procedures to
check for one of these problems. If the thermostatic
expansion valve is not feeding properly or the refrigerant
charge is low, the evaporator will not form ice as it should
and a long freeze cycle will occur. This could also be the
result of the hot gas valve not closing completely during
the freeze cycle or if the compressor valves are weak or
inefficient. An inefficient compressor however, will
usually show up first on the KM model through a longer
than normal harvest cycle. This is because of cooler
than normal discharge gas. Use proper refrigeration
practices to repair a refrigeration system problem.
While these are not the only reasons for a 60 minute
freeze cycle, they are the most common and should be
checked to resolve a 3 beep/yellow fault LED alarm.

Feb 27, 2008 | Hoshizaki Commercial Freezer KM-500MAH

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