Scotsman AFE325 Manuale utente

AFE325 Product Manual

Purpose of this manual: To provide detailed

installation and operation instructions; to give

insights into how the machine works; to list

possible causes for problems; and to suggest

procedures for specific types of service.

The AFE325 is an ice maker that makes and

stores flaked ice.

The refrigeration system is either air or water

cooled, and it uses R-134a as a refrigerant. The

control system uses thermostat as a bin control

and a water pressure switch as the water safety

control.

Table of Contents

Specifications: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

To The Installer: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

For The Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

For The Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

Final Check List & Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

User Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

Component Location: Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

Refrigeration System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9

Water System Operation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

Mechanical Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

Sanitation and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

Maintenance And Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

Maintenance: Air Cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

Maintenance: Component Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16

Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

Water Seal & Bottom Bearing Replacement: . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 19

Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

Gear Reducer Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21

Gear Reducer Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

A Parts List and Wiring Diagram are located in the center of this manual, printed on yellow paper.

AFE325

August 1994

Page 1

Specifications:

.Model Dimensions Basic

Electrical Condenser

Type Min. Circ.

Ampacity Max. Fuse

Size Refrigerant Charge

(R-134a)

AFE325AE-1A 33 x 36 1⁄16 x 24 115/60/1 Air Cooled 10.7 15 11 oz.

AFE325AE-6A 33 x 36 1⁄16 x 24 230/50/1 Air Cooled 5.4 15 11 oz.

H’ x W" x D"

The finish for this machine is either

painted enamel or stainless steel. No

panel kit is available to convert an

enamel machine to stainless steel.

Scotsman ice machines, like the

AFE325, are designed to be installed

indoors, in a controlled environment.

The minimum and maximum

operating conditions are:

•Minimum Air Temperature:

50oF.

•Maximum Air Temperature:

100oF.

•Minimum Water Temperature:

40oF.

•Maximum Water Temperature:

100oF.

•60 Hz Voltage may vary between

104 and 126 volts.

•Water Pressure may vary

between 20 and 80 psi.

Operating the machine

outside these

conditions constitutes

misuse and voids the

warranty.

Scotsman Ice Systems

are designed and

manufactured with the

highest regard for

safety and

performance. They

meet or exceed the

standards of UL, NSF

and CSA.

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 parts

and/of other components

not specifically approved

by Scotsman.

Scotsman reserves the

right to make design

changes and/or

improvements at any

time. Specifications and

designs are subject to

change without notice

AFE325

August 1994

Page 2

To The Installer:

A professional installation of any product is critical

to the long term satisfaction of the user. The

AFE325 is designed to be installed indoors, near a

drain. Determine the location from the anticipated

use and any options planned for.

This air cooled machine blows air out the back and

left sides of the cabinet. Do not install the machine

where the air flow might be blocked.

The machine will require electrical power, water

and a drain. Follow all local codes. Rough in the

utilities before placing the machine into position

(see For The Electrician and For The Plumber).

After uncrating, install the legs or optional casters.

If the building’s drain is a floor drain near the

machine, the cabinet can be placed on the floor

and sealed around the edges.

Place the cabinet in the place where it will be

operating. Note that the electrical and water

connections need to be made.

Level the unit front to back and left to right.

Water Quality:

The quality of the water supplied to the machine

will directly affect the purity of the ice and the

reliability of the machine. While the condition of the

water supplied to a building is normally out of the

control of the user, water can be treated at the

point of use.

There are two major types of water impurities:

suspended solids (those that are carried along

with the water and may be filtered out) and

dissolved solids (those that are part of the water

and have to be treated). A water filter is always a

good idea, but does require regular maintenance

to change the cartridge. In some water conditions,

water treatment may be required. Generally this

means a polyphosphate feeder of some kind.

Water softeners are not recommended for the

AFE325.

Cool Air In

Warm Air Out

Warm Air

Out

Airflow Direction

Utility

Connections

Here

Nameplate Is Located

On The Back Panel.

AFE325

August 1994

Page 3

For The Plumber

Drains: The ice maker requires a gravity drain for

the reservoir overflow and bin drain. The pitch on

the drain tubes must be at least 1/4 inch fall per

foot of horizontal run. On long horizontal runs, a

vent at the back of the cabinet will improve

draining, and is recommended.

Water supply:

Connect cold, potable water to the machine. A

hand valve near the location is recommended. A

water filter is also a good idea.

Follow all local codes.

There are two drains and one water inlet

connection to make.

The drains are: a copper bin drain tube; and a

rubber reservoir overflow tube.

The water inlet connection is a 3/8" male flare.

Route a drain line to the reservoir overflow drain

hose. Route a separate drain to the bin drain tube.

Route the inlet water line to the fitting on the

corner post.

Water Inlet

3/8" Male Flare

Drain

7⁄16" I.D. Flexible Hose

AFE325

January 2005

Page 4

For The Electrician

Electrical connections:

Follow All Local, State & National Codes

Check the nameplate for voltage and current

requirements. An electrical cord is not supplied.

Connect the AFE325 to a separate electrical

circuit. Wiring to the machine must conform to all

codes. A licensed electrician may be required in

some situations. The electrical connection is made

in the control box inside the machine.

This unit must be grounded.

Route the electrical power cord thru the corner

post to the control box inside the cabinet.

To make the electrical connection, remove the

following parts:

•Top panel

•Bin door

•Rubber moulding

•Left moulding cover

•Left track

•Upper front panel

•Upper baffle

•Left side panel

•Front louvered panel

•Control box cover

If the machine will be started up later, after making

the electrical connections, replace all panels.

Upper Front

Panel

Bin Door

Spacer

Bin Door

Left Track

Left Moulding

Cover

Upper BaffleFront Louvered

Panel

Ice Discharge Tube

(Ref)

Top Panel

Left Side

Panel

Control Box Cover

Electrical

Inlet

Serial Number

Plate

AFE325

August 1994

Page 5

Final Check List & Initial Start Up

1. Is the machine located indoors where the

temperature limitations are not exceeded?

2. Is there at least 6" clearance on the left side and

the back of the cabinet for adequate air flow?

3. Is the water supply adequate, and has a shut off

valve been installed?

4. Is the cabinet level?

5. Have all of the electrical and drain connections

been made?

Initial Start Up

1. Remove the following parts:

•Top panel

•Bin door

•Rubber molding

•Left molding cover

•Left track

•Upper front panel

•Upper baffle

•Left side panel

•Front louvered panel

•Control box cover

•the top panel.

2. Open the water shut off valve.

3. Watch the water fill the reservoir. Check that it

flows in and fills the reservoir near to the mark

molded into the side of the reservoir. Check that

the float shuts off the water flow when the tank is

full. Check for leaks. Tighten hose clamps as

needed.

4. Plug the unit in or switch on the electrical power.

5. Switch the master switch to ON.

6. Let the machine operate, listen for any unusual

noises. If needed, reposition tubing & panels to

eliminate vibration.

After the unit has been operating for about 10

minutes, there should be enough ice in the bin to

test the bin thermostat.

7. Pick up some ice and hold it up against the

bottom of the ice thermostat tube.

8. After a short time the bin thermostat should

switch the machine off.

9. Pour water into the bin and check that the drain

does not leak but drains the water rapidly.

10. Replace all panels.

11. Explain to the user the maintenance

requirements and operation of the machine.

12. Fill out the Warranty Registration and

Customer Evaluation form. Mail it to Scotsman.

13. Leave the service manual with the owner/user

and explain who should be called if service is

needed.

Adjustment Altitude (ft.

above seal level) Amount of

adjustment from

factory setting

Range

Screw CW 2,000 35o

4,000 90o

6,000 145o

8,000 190o

Note: For High Altitude Installations an Altitude

Adjustment May Be Required:

(11-0354-01, 20 Ranco brand bin thermostats only)

AFE325

August 1994

Page 6

User Operation

The AFE325 is an automatic ice flaked machine.

All it requires is cool air, clean water, a drain, and

an adequate supply of electrical power.

The user must regularly sanitize and clean the

machine.

Component Location & Function

Evaporator. This is a vertical cylinder full of water

and refrigerated. Also in the cylinder is a slowly

rotating auger. The auger forces the ice up the

evaporator walls and compresses it at the top. The

resulting flaked ice then falls by gravity into the ice

storage bin.

Water Reservoir. The water reservoir contains the

inlet float valve and the water level sensor. The

float valve controls the flow of water into the

reservoir.

Water Pressure Cut Out Switch: The purpose of

this switch is to stop the ice maker if the water

supply fails.

Condenser. The AFE325 uses an air cooled

condenser. It blows air out, away from the fan

motor. The heat removed from the water is

exhausted from the condenser.

Compressor. The refrigeration system

compressor provides the force to move the

refrigerant around the system.

Auger Drive. The auger drive

is a direct drive gear reducer.

AFE325

August 1994

Page 7

Component Location: Control Box

Auger Delay Pressure Control: This pressure

switch, connected to the low side of the

refrigeration system, controls the auger drive

motor.

On-Off switch: This toggle switch shuts off the

machine. It is not a complete disconnect.

Bin Thermostat: This thermostat turns the

machine on and off in response to changes in

temperature of the capillary tube. It opens at 350F.

and closes at 450F. The capillary tube is mounted

on the inside of the ice chute.

Auger Delay Pressure

Control

Toggle Switch

Terminal Strip

Bin Thermostat

Control Box

AFE325

August 1994

Page 8

Refrigeration System Operation

The AFE325 uses a forced draft air cooled

condenser, capillary tube and hermetic

compressor. The system uses R-134a as a

refrigerant. High pressure, high temperature

refrigerant is forced thru the condenser where it

looses enough heat to condense. The high

pressure liquid refrigerant then passes thru the

capillary tube which causes a pressure drop in the

evaporator. As the high pressure liquid refrigerant

moves into the evaporator’s area of low pressure,

the warm water and low pressure cause the

refrigerant to evaporate and absorb heat from the

metal walls of the evaporator. After the refrigerant

has flowed thru the evaporator it goes back to the

compressor thru the suction line as a low pressure

vapor. At the compressor the cycle is repeated.

The AFE325 uses a low side pressure control as a

safety, it will shut the system down if the suction

pressure is too low for reliable operation.

System Characteristics:

Note: This ice machine has a sealed

refrigeration system. Tap into the system ONLY

when it’s absolutely necessary. After tapping

in, recovery, repair, evacuation and recharging,

the piercing valve must be removed and the

system re-sealed.

Typical Low Side Pressure*: 7 - 10 PSIG

Typical Discharge Side Pressure*: 130 - 165 PSIG

Typical Auger Drive Motor Amps (60 Hz): 2.8 - 3.1

Auger Drive Output RPM (60 Hz): 9.6

System Refrigerant Charge: 11 Ounces of R-134a

* Pressures depend upon air and water

temperatures. Numbers listed are for 70oF.

air/50oF. water and 90oF. air/70oF. water.

Evaporator

Suction Line

Compressor

Capillary Tube

Drier

Air Cooled

Condenser

Refrigeration System Schematic

AFE325

August 1994

Page 9

Water System Operation:

The water system consists of a float valve and

reservoir. The water level in the reservoir tank is

the same level as that inside the evaporator.

Building water supply flows to the float valve and

the float valve opens to add water to the reservoir

as water flows out to the evaporator.

Inside the evaporator there is a water seal. This

seal is the type that has a rotating half and a

stationary half. The area where the two seals

touch are smooth flat surfaces. When the auger is

installed in the evaporator, it forces the rotating

half of the seal against the stationary half. The

stationary half is spring-loaded and provides a firm

pressure against the auger portion of the seal.

Reservoir

Float

Water Inlet

Water Line

Bin Drain

Evaporator

Reservoir Overflow

Gear Reducer

Ice Tube

Bin

Thermostat

Bracket

Ice

Clamp

Spout

Water System Schematic

Grommet

AFE325

August 1994

Page 10

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