background image

Removal and Replacement: Refrigeration System

I

f the refrigeration system must be serviced, the

quality of service must insure that there will not be
a repeat failure, as repeat failures will cause
refrigerant to be discharged into the air by the
failure or when the failure is corrected:

The access valves are at the front of the cabinet,
behind the left grill. To use them, remove the cap
from the stem, and using an 3/16" allen wrench,
check that the valve is CLOSED. Then remove the
core cap and attach guages in the usual way. The
valve may then be opened to service the system.
Note: several turns are required to fully open the
valve. 

Close the valve and replace the caps when the
job is finished. The Valve MUST be Closed and
the caps MUST be on, or the VALVE WILL
LEAK.

••

If there has been a compressor burn out, check
for acid in the oil. If acid is indicated, extra steps
must be taken to clean up the system. 

••

Never use refrigerant, such as R-11, to clean
up or flush out a refrigeration system. When
system clean-up is required, the use of suction
line filter-dryers and liquid line filter-dryers are
recommended.

••

Always replace the dryer when repairing a leak
or replacing a refrigeration component. 

••

Evacuate the system with a good vacuum
pump to 200 microns or less. If the triple
evacuation method is used, the vacuum should
be broken each time with dry nitrogen, not
refrigerant. Evacuation must be from both sides
of the system. 

••

Weigh in or measure in the nameplate charge.
Recharge into the high side.

••

Check for leaks with a high quality, electronic
leak detector. Halide torches will not locate the
very small leaks. 

If an ice machine is to be discarded and still
contains refrigerant, Scotsman recommends that
the refrigerant be recovered, reclaimed, or
recycled so that it is not discharged into the air.

Control Box Service

The control box may be lifted up from its normal
position to improve service access.

To Move Control Box

1. Disconnect electrical power.

2. Go thru the steps to remove the hood, door and
bin.

3. Locate and remove the 3/8" hex head screw
holding the control box to the base, just below the
purge switch.

4. Pull the control box forward about an inch.

5. The control box may now be moved up the
height of the control box, be careful not to kink any
capillary tubes.

6. After service, replace the control box in its
normal position.

ALLEN

WRENCH

Torque Stem

to 6-8 ft. lbs.

Torque Stem Cap

to 8-12 ft. lb.

ACCESS VALVE

Torque Core Cap

to 7-12 ft. lb.

Note: There are

NO Schrader

cores in the valve.

Access

Valve Use

Electrical shock hazard.

Electrical shock can
cause personal injury.
Disconnect power before
beginning to service
components.

AFE400

May 1995

Page 25

Summary of Contents for AFE400

Page 1: ...llow service access without removing the ice machine from its installed location The refrigeration system uses R 134a as the refrigerant Table of Contents Specifications page 2 Limitations page 3 Installation page 4 Plumbing page 5 Final Check List page 6 Cabinet Removal page 7 Component Location page 8 Electrical Sequence page 9 Initial Start Up page 10 Cleaning page 11 Water Schematic page 15 Re...

Page 2: ...al Amps Maximum Fuse Refrigerant Charge R 134a AFE400AE 1A 33 x 241 4 x 24 115 60 1 Flake Air 9 15 15 oz AFE400WE 1A 33 x 241 4 x 24 115 60 1 Flake Water 9 15 10 oz AFE400AE 6A 33 x 241 4 x 24 230 50 1 Flake Air 9 15 15 oz A scoop and legs 6 are included The nameplate is located on the back panel A serial number plate is located behind the right grill in front of the control box on the base SERIAL...

Page 3: ... of UL NSF and CUL Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way including the use of any part and or other components not specifically approved by Scotsman Scotsman reserves the right to make design changes and or improvements at any time Specifications and design are subject to change without notice Airflow on ...

Page 4: ...s out suspended solids to a dimension of 5 microns or less The finer the filter the better but finer filters may plug up sooner than course ones It may be necessary to add a course filter ahead of the fine filter to prolong filter life Have the water tested Either acidic water or alkaline water will cause corrosion Dissolved solids cannot be filtered out Check with a water treatment specialist reg...

Page 5: ... P T brass Drain tube material must be rigid and meet local code Traps in the bin drain line without vents ahead of them will cause poor draining The bin drain must be vented if there is a long horizontal run 5 or more All drains are gravity and must have a minimum fall of 1 4 per foot of horizontal run Maintain the air gap required by local code between the end of the drain tubes and the building...

Page 6: ... ice maker cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified 2 Has the water supply been connected 3 Is the water pressure adequate 4 Have the water connections been checked for water leaks 5 Have the drain connections been made 6 Have the drain connections been checked for leaks 7 Is the cabinet level 8 Is the ice machine plugged into an electr...

Page 7: ... until it can be lifted up Caution the door may be free to come out the back of the hood when removed from the cabinet base 4 To remove the cabinet base the hood must be removed first 5 Remove 4 screws and the two grills at the front of the base 6 In the area exposed when the grills are removed are two knobs similar to those removed in step 2 Unscrew and remove the two knobs 7 Locate bin drain Loo...

Page 8: ...e motor High Pressure Cut Out water cooled only The pressure switch is designed to open and shut off the machine should the high side refrigeration pressure become too high usually as a result of not enough water through the water cooled condenser It is a manual reset On Off switch This toggle switch shuts off the machine It is not a complete disconnect Bin Thermostat This thermostat turns the mac...

Page 9: ...ssure Control This switch is designed to open should the water pressure to the machine drop too low The next control is the Bin Thermostat It is closed when there is no ice on the portion of the control inside the thermostat bracket It is open when there is ice on the portion of the control inside the thermostat bracket Closing of the bin thermostat begins the process of making ice because the lin...

Page 10: ...nutes Then pour clean water into the bin to melt the ice This will flush out most manufacturing or shipping materials that may have strayed into the water ice making system 7 Check the operation of the bin thermostat by placing ice over the sensing tube A properly operating bin thermostat will open when ice covers the sensing tube When the bin thermostat opens the compressor will stop but the auge...

Page 11: ...th cold water or if torn or so dirty it can t be cleaned replace with a new filter 5 Return the filter to its installed position 6 Replace the bracket removed in step 2 7 Replace the grill Do not operate the unit without the filter in place Note If the unit has been operated without the filter in place the fins of the condenser will become fouled with dirt and must be cleaned Scotsman recommends t...

Page 12: ...Move the master switch to ON continue to pour cleaning solution into the reservoir until it has all been used 17 After all of the solution has been poured in remove the block from under the float 18 Operate the unit for 15 more minutes and then taste the ice if not sour tasting all of the ice machine cleaner has been used up Do not go to the next step until the ice has no sour taste 19 Pour clean ...

Page 13: ...Mix sanitizing solution of 1 ounce of household bleach to 2 gallons of water 2 Using clean rubber gloves and a clean cloth wipe all interior surfaces of ice storage bin hood and door with sanitizing solution Be sure and wipe the joint between the hood and bin with the sanitizing solution Use a clean brush to thoroughly swab all interior surfaces with the sanitizing solution 3 Reassemble and allow ...

Page 14: ...n Note The auger can t be pulled out when the unit is installed under the counter 1 Remove the hood door and ice storage bin 2 Remove stainless steel cover plate 3 Remove cover from reservoir and block the float or shut off the water supply 4 Locate evaporator drain and drain the evaporator reservoir 5 Remove O ring holding insulation halves together at the top of the evaporator 6 Remove insulatio...

Page 15: ...porator the water chills into ice crystals and is pushed up the evaporator by the auger At the top of the evaporator the ice is pressed against a restriction called a breaker and some of the water is squeezed out of the crystalline ice The flaked ice then flows through the chute into the bin WATER SCHEMATIC STRAINER WATER SAFETY SWITCH RESERVOIR OVERFLOW DRAIN RESERVOIR EVAPORATOR DRAIN BIN DRAIN ...

Page 16: ...tic expansion valve the liquid refrigerant passes from a high pressure zone to one of relatively low pressure and in the low pressure zone it evaporates The low pressure zone where the refrigerant evaporates is the evaporator When the refrigerant evaporates it absorbs heat from the metal parts of the evaporator and the water inside it From the evaporator the refrigerant flows back to the compresso...

Page 17: ...p Draw Compressor amps should be about 6 7 Superheat 6 8o F Air Cooled Fan Motor 16 watt rating 1500 RPM CW Water Cooled Fan Motor 5 watt rating 1500 RPM CW Compressor Tecumseh AE600AT 944 A4 Gearmotor 1 10 H P shaded pole motor 11 RPM output shaft speed Gearmotor amps will be about 2 8 3 2 Bin Thermostat 45o F cut in 35o F cut out minimum 61o F cut in 51o F cut out maximum Water Pressure Switch 1...

Page 18: ...rmostat replace it If the thermostat is closed and the unit will not start go to E E Check the water pressure to the unit The machine will not run if there is not enough water pressure Restore adjust water supply If the unit will not start with good water pressure go to F F Check that the Auger Delay contacts 3 2 are closed If open and the low side suction pressure is over 35 PSIG replace the auge...

Page 19: ...Replace those items found defective STATUS MAKES ICE BUT ALSO MAKES EXCESSIVE NOISE A Check if the unit has been cleaned recently it will make extra noise if minerals have stained the auger and or evaporator Clean it if in doubt B Check the coupling by greasing it C Check the bearings for wear D Check the evaporator for wear There are vertical ice guide marks machined into the evaporator s interio...

Page 20: ...e controls posts 6 Follow the capillary tube of the bin thermostat and remove it from the grommet in the back of the control box 7 Pull the end of the bin thermostat from the tube holder 8 Pull the capillary back through the grommet in the evaporator bracket until free Remove the bin thermostat from the ice machine 9 Reverse the above steps to replace Water on the capillary tube will make the inst...

Page 21: ...er of the auger so that when the water seal is placed on the auger the gap between the auger shoulder and the water seal is completely filled with the sealant 4 Clean the inside of the evaporator at the bottom bearing and water seal mounting area Lubricate the outside edge of the stationary seal with water 5 Carefully push the stationary part of the water seal up into the bottom of the evaporator ...

Page 22: ...ator and reservoir cover plate 3 Unscrew the bolts holding the gearmotor mounting plate to the ice machine chassis 4 Use a 1 2 box wrench to unscrew the three cap screws holding the evaporator to the gearmotor 5 Remove the motor and centrifugal switch electrical leads from their connections 6 Raise the evaporator assembly up enough that the output shaft clears the freezer adaptor 7 Remove the gear...

Page 23: ...se cover and torque at 80 90 inch pounds 4 Bench test the gearmotor assembly Test for noise amp draw must not be in excess of ice maker nameplate for gearmotor and oil leaks Return the gearmotor assembly to the unit Be certain all mounting surfaces are clean and reassemble to the gearmotor mounting plate Then bolt back onto ice machine chassis GEARMOTOR PARTS MOTOR HOUSING FAN STATOR ROTOR FIBER G...

Page 24: ...1 Raise the evaporator assembly up enough that the output shaft clears the freezer adaptor and remove the evaporator from the ice machine 12 After the evaporator has been removed from the ice machine the auger and bearings may be removed The fasteners auger breaker cover and insulation halves should be saved for use in the new evaporator New bearings and a water seal will be required when replacin...

Page 25: ...cuum pump to 200 microns or less If the triple evacuation method is used the vacuum should be broken each time with dry nitrogen not refrigerant Evacuation must be from both sides of the system Weigh in or measure in the nameplate charge Recharge into the high side Check for leaks with a high quality electronic leak detector Halide torches will not locate the very small leaks If an ice machine is ...

Reviews: