background image

25 

functioning properly. If the hot gas valve leaks during the freeze cycle, ice will not form on the top 
of the evaporator and suction pressure will be higher than normal. To check if the hot gas valve is 
leaking, let the machine run in the freeze cycle for approximately 5 minutes. Now feel the 
temperature between the inlet and outlet of the valve. A definite temperature difference should be 
felt. If the lines are the same temperature and the suction pressure is higher than normal; the valve is 
leaking and should be replaced. 
 
 
 
 
 
 
 
 
 

Evaporator 

As water is circulated over the front of the evaporator, liquid refrigerant is circulated through the 
tubing attached to the back of the evaporator. As the liquid refrigerant in the tubing vaporizes, it 
absorbs heat from the water causing the water to freeze. The evaporator should be completely 
flooded throughout most of the freeze cycle. A flooded evaporator will build ice evenly across the 
evaporator. A starved evaporator will have thick ice at the bottom and thin ice at the top. Most 
problems with ice formation or harvesting are not related to a defective evaporator. 
If the evaporator is flooded but not building ice evenly, it is possible the evaporator has coil 
separation. Evaporator coil separation is the separation of the refrigerant tubing from the back of the 
evaporator plate. This is very rare but occasionally occurs. The symptoms of coil separation are low 
suction pressure, ice not releasing from the evaporator during harvest and hollow cubes or uneven 
ice bridge on some areas of the evaporator. 
If coil separation is suspected, let the machine run in freeze until the timer has energized. Check the 
evaporator for areas where cubes are less developed than cubes in other areas. If the cubes are all 
the same size, coil separation is not the problem. If there are areas other than the top row with less 
developed cubes, check the refrigerant lines at the inlet(s) and outlet(s) of the evaporator, if both 
lines are frosted the coil is separated. To confirm coil separation, remove and check the back of the 
evaporator. If the coil is separated, the evaporator must be replaced. If the outlet(s) of the 
evaporator is not frosted, the problem is not with coil separation (refer to Troubleshooting). 

Note: 

Permanent discoloration of the evaporator plating is normal and will cause no problems with 

harvesting the ice or sanitary conditions. Before condemning the evaporator for plating problems, 
be certain it is not just discoloration. Good evaporators will not be covered under warranty. If the 
spillway (plastic evaporator top) becomes damaged, it can be replaced. It is not necessary to replace 
the entire evaporator. 
As liquid refrigerant leaves the evaporator, it changes to a lowpressure gas before returning to the 
compressor. Liquid refrigerant must not return to the compressor or damage will result. Frost on the 
suction line at the inlet of the compressor indicates liquid returning to the compressor. Check for 
frost at the end of the freeze cycle. If liquid is returning to the compressor, the problem must be 
located and corrected. See Refrigerant Charge, Thermostatic Valve and Evaporator. 

 
Refrigerant 

Refrigerant in a highpressure liquid form is fed to an expansion valve where the refrigerant is 
reduced to a lowpressure liquid. Under this low pressure, the liquid will absorb heat from the 
evaporator causing the liquid to change to a vapor. This vapor is the drawn into the compressor 

Содержание MIM1000

Страница 1: ...1 Automatic Ice maker Service manual MIM452 MIM600 MIM1000...

Страница 2: ...Works 4 Water System 7 Wiring Connections and Controller 9 Exploding Drawing 12 TroubleShooting 14 Before Maintenance 14 Basic Checking 14 TroubleshootingGuide 15 Adjustment and Replacement 20 Advanc...

Страница 3: ...t Water Filtration A water filter system should be installed with the ice machine Clearance Requirements Self contained air cooled ice machines must have a minimum of 6 inches 15cm of clearance at the...

Страница 4: ...oth to remove any remaining residue If necessary remove the water distribution tube disassemble and clean with a bottlebrush Reassemble all components and repeat steps 4 through 7 as required to remov...

Страница 5: ...5 Cooling System...

Страница 6: ...ol the liquid refrigerant after passing through the condenser The drier and filter reduce possible dirt and moisture in the refrigerant The refrigerant expands in the evaporator cooling it so ice will...

Страница 7: ...et tube 7 Floater valve 8 Water trough 9 Water pump 10 Water pump outlet tube 11 Water distribution tube 12 Evaporator Ice Mold 13 Ice full sensor 14 Drain pipe connector 15 Drain pipe hex nut 16 Drai...

Страница 8: ...ugh to the water distribution tube The distributed water flows over the surface of the cold evaporator where the purest water is converted to ice The unfrozen water returning to the trough At the end...

Страница 9: ...9 Wiring Connection...

Страница 10: ...rks regularly to keep the lower temperature for lower ice melting The rest of the electric components are powered off The WHITE LED indicates the ice full status and the GREEN AND YELLOW LEDs together...

Страница 11: ...e in the Ice Size Adjustment mode press the Clean button or the Mode button for the desired ice size Smaller ice setting By pressing the Clean button you can decrease the size of the ice cubes The FUL...

Страница 12: ...12 Exploding Drawing...

Страница 13: ...pipe 17 Water outlet pipe screw 18 water outlet pipe screw 19 Water inlet connector 20 foaming PE 21 top panel 22 compressor starting device component 23 compressor 24 discharge pipe1 25 suction pipe...

Страница 14: ...ront panel 48 compressor base 49 left panel 50 knob 51 compressor base support 52 Water distributor tube 53 Water out of pump 54 water pump support 55 Water pump 56 Drain pipe 57 Drain pipe connector...

Страница 15: ...he cycle of the icemaking and ice harvesting normal Does water run is the fan running and is the evaporator getting cold enough Check the water system especially at the connections Are there any water...

Страница 16: ...16...

Страница 17: ...17...

Страница 18: ...18...

Страница 19: ...19...

Страница 20: ...20...

Страница 21: ...e steps to reassemble Replacing the cooling system components To replace the condensing components see the Cooling System figure 1 Replacing the compressor and the compressor kit includes relay therma...

Страница 22: ...condenser The refrigerant changes to a liquid when cooled The refrigerant in a liquid state passes through a filter drier The filter drier traps small amounts of moisture and foreign particles from t...

Страница 23: ...proper voltage is supplied to the compressor and all wiring is properly connected If the compressor does not start and there is excessive amperage draw see locked rotor amps on compressor tag the com...

Страница 24: ...l suction pressure A low refrigerant charge will also starve the evaporator and cause low suction and discharge pressures If not sure of the amount of charge in the system the refrigerant should be re...

Страница 25: ...until the timer has energized Check the evaporator for areas where cubes are less developed than cubes in other areas If the cubes are all the same size coil separation is not the problem If there ar...

Страница 26: ...cycle When the freeze timer is energized the machine is in the timed portion of the freeze cycle When the machine enters harvest the temperature rises but the amount of time the machine is in harvest...

Страница 27: ...switch which detects its position When ice is sitting on the control the slideway faces down indicating that ice is present and disconnecting the circuit from the reed switch When the ice is removed t...

Страница 28: ...re sensor of condenser 19 3 1851700501 Temperature sensor of evaporator 20 1858442400 Transformer 24 1854700800 Drain valve 28 1854601900 Expansive valve 29 1 1854704410 Hot gas valve body 29 2 185470...

Отзывы: