Maxx Ice MIM250 User Manual

Automatic Ice maker

Service manual

MIM250

Table of contents

Installation Guidelines ---------------------------------------------------------3 How the Ice Maker Works ----------------------------------------------------4 Water System --------------------------------------------------------------------5 Wiring Connections and Controller ------------------------------------------8 Exploding Drawing -------------------------------------------------------------11

TroubleShooting ----------------------------------------------------------------13 Before Maintenance ------------------------------------------------------------13 Basic Checking ------------------------------------------------------------------13 TroubleshootingGuide ----------------------------------------------------------14

Adjustment and Replacement -------------------------------------------------19 Advanced component troubleshooting techniques --------------------------20

Spare parts list ------------------------------------------------------------------- 26

Installation Guidelines

Note: Installation should be performed by a trained Service Technician. For proper operation of the ice machine, the following installation guidelines must be followed. Failure to do so may result in loss of production capacity, premature part failures, and may void all warranties.

Ambient Operating Temperatures

Minimum Operating Temperature: 50°F (10°C) Maximum Operating Temperature 100°F (38°C).

Note: These products are not designed for outdoor installation.

Incoming Water Supply

Minimum incoming water temperature: 40°F (5°C) Maximum incoming water temperature: 90°F (32°C) Minimum incoming water pressure: 15 psig Maximum incoming water pressure: 80 psig

Note: If water pressure exceeds 80 psig, a water pressure regulator must be installed. Drains: Route bin drain, purge drain and water condenser drain individually to a floor drain. The

use of condensate pumps for draining water on equipment producing over 200 lbs./day is not recommended by Manufactor. We assumes no responsibility for improperly installed equipment.

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 rear, top, and sides of the ice machine for proper air circulation. Since undercounter machines breathe from the front, top and side clearances are minimal.

Stacking

If the ice machines are to be stacked, refer to the instructions in the stacking kit. We does not endorse stacking aircooled ice machines.

Dispenser Application

A thermostatic bin control kit must be installed if the ice machine is placed on a dispenser. A bin top may or may not be required.

Ice Maker Maintenance

Maintenance Procedure

1. Clean the icemaking section per the instructions below. Cleaning should be performed a minimum of every 6 months. Local water conditions may require that cleaning be performed more often.

2. Check ice bridge thickness. Proper thickness should be 1/16-1/8’’.

3. Check water level in trough. See troubleshooting for proper water level and adjustment.

4. Clean the condenser to insure unobstructed air flow.

5. Check for leaks of any kind: Water, Refrigerant, Oil, Etc.

6. Check the bin switch for proper adjustment.

7. Check all electrical connections.

8. Oil the fan motor if the motor has an oil fitting.

Cleaning and Sanitizing

Harvest problems may occur if the following procedures are not performed every 6 months.

1. Remove the ice machine front panel.

2. Make sure that all the ice is off of the evaporator. If ice is being made, wait for cycle completion, then turn the machine “OFF” at the selector switch.

3. Remove or melt all ice in the storage bin.

4. Add recommended amount of approved ice machine cleaner to the water trough according to label instructions on the container.

5. Initiate the clean cycle at the controller board switch by turning on the machine and activating the switch marked as “CLEAN”. Note: This must be done within 3 minutes of turning the machine “ON”. Allow the cleaner to circulate for approximately 15 minutes to remove mineral deposits.

6. After 15 minutes (or 30 minutes automatically), stop the process and drain the sump. Refill with clean water run another 5 minutes and drain again. Fill the trough with fresh incoming water.

7. Terminate the wash cycle at the switch by placing the switch in the “OFF” position. Remove the splash curtain (if available) and inspect the evaporator and water spillway (the plastic top of the evaporator) to assure all mineral residue has been removed.

8. If necessary, wipe the evaporator, spillway and other water transport surfaces with a clean soft cloth 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 remove residue.

9. Turn OFF ice machine water supply and clean the water trough thoroughly to remove all scale or slime buildup. If necessary, remove the water trough to reach all splash areas and float.

10. Prepare 1½ to 2 gallons (5.7 to 7.5 liters) of approved (EPA/FDA) sodium hypochloride food equipment sanitizer to form a solution with 100 to 200 ppm free chlorine yield.

11. Add enough sanitizing solution to fill the water trough to overflowing and activate the switch to the “CLEAN” position and allow circulation to occur for 10 minutes and inspect all disassembled fittings for leaks. During this time, wipe down all other ice machine splash areas, plus the interior surfaces of the bin, deflector and door with the remaining sanitizing solution. Inspect to insure that all functional parts, fasteners, thermostat bulbs (if used), etc. are in place.

12. After 3 minutes, stop the process and drain the sump. Refill with clean water run another 5 minutes and drain again. Fill the trough with fresh incoming water.

13. Place the switch to the “ON” position and replace or close the panel. Discard the first two ice harvests.

How the Ice Maker Works

Refer to the Operation section of the User’s Manual (pages 12 to 14) for a clear description of how the ice maker makes ice and uses water. There are 3 systems: the Cooling System, the Water System and the Electrical System.

Cooling System

ITEM NO

DESCRIPTION

Compressor

Discharge tube

Cu three ways

Condenser

Drier and filter

Capillary tube

Connection tube

Hot gas valve

Hot gas tube

Evaporator (Ice Mold)

Fan blade(φ200X28°)

Suction pipe

Motor 5W

Motor 10W

Temperature sensor of the evaporator

Temperature sensor of the condenser

Controller

During the icemaking stage, the hot gas solenoid valve is closed. The hot refrigerant gas is pumped out of the compressor to the condenser. The hot gas is cooled by fanforced air to cool 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 form while in the presence of water. Low pressure refrigerant gas returns to the compressor from the evaporator where the cycle continues. During the ice harvest stage, the solenoid valve is open. The hot refrigerant gas is pumped out of the compressor to the evaporator through the hot gas valve. As the hot gas is not cooled by the condenser, the refrigerant warms the evaporator. Ice in contact with the evaporator begins to melt on the back side. The ice gradually ice slides off of the evaporator and drops to the storage bin.

Water System

ITEM NO.

DESCRIPTION

Water supply tube

Water inlet connector

Nut of water inlet tube

Supporting tube

Water pump inlet tube

Floater valve

Water trough

Water pump

Water pump outlet tube

Ice slideway

Water distribution tube

Evaporator (Ice Mold)

Magnetism switch

Gasket

Screw cap

When the water inlet is connected with the main water supply, water will fill the trough through the float valve until the water level in the trough closes the valve. During the icemaking stage, water is pumped from the water trough 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 of freeze cycle and during harvest, the water dump valve is opened and the mineral laden remaining water is pumped down the drain.

Wiring Connection :

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