Scotsman FM2402RH Manuale utente

TO THE OWNER OR USER:

The service manual you are reading is intended to

provide you, and the maintenance or service

technician, with the information needed to install,

start up, clean, maintain and service this ice

system.

The FM2402RH (remote high side) is the freezer

portion of a commercial ice machine. It is designed

to be connected to the condensing section of a

refrigeration system, specifically a supermarket

R-22 system. It consists of two evaporators, two

gearmotors, two liquid line valves, two control

boxes, two thermostatic expansion valves, and an

EPR valve.

For the Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17

Removal and Replacement

Bin Controls and Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

Water Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23

Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25

Circuit Board Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26

Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.

FM2402RH

August 1992

Page 1

FOR THE INSTALLER: Specifications

The FM2402RH is designed to fit several

Scotsman storage bins. In some cases a bin top

kit will be required.

Installation Limitations: The FM2402RH is

designed for indoor installations only. The machine

must also be in a controlled environment where

the air temperature does not fall below 500F., or

go above 1000F.

The water temperature must be between 400F.

and 1000F.

The electrical power supply must not drop below

-5% of the lowest nameplate voltage or go above

10% of the highest nameplate voltage.

SPECIFICATIONS:

Scotsman Ice Systems are designed and

manufactured with the highest regard for safety

and performance. They meet or exceed the

standards of U.L., N.S.F., and C.S.A.

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 parts 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 designs are subject to change

without notice.

FM2402RH-32A 27" X 42" X 24" Flake 208-230/60/1

2.7

16,000

Model Number Dimensions (w/o Bin)

H" x W" D" Ice

Type Basic

Electrical

Minimum

Circuit

Ampacity

Maximum

Fuse

Size

BTU’s

Required

15.53"

3.1"

SUCTION LINE CONNECTION 7⁄8"

LIQUID LINE CONNECTI0N 1⁄2"

20.84"

9.43"

5.25" 3"

17.8"

18.8"

21.66" ELECTRICAL INLET

POTABLE WATER INLET 3/8" FLARE

DRAIN 3/4" FPT

BACK VIEW

FM2402RH

August 1992

Page 2

FOR THE INSTALLER

Select the Location:

The unit can only be installed indoors

within the limitations described on

page 2.

The ice machine will have to be

connected to the buildings R-22

refrigeration system, check to be

sure that the system has enough

extra capacity to handle a minimum

of additional 16,000 BTU’s per hour

@ 1100F. liquid line temperature.

Assume a 00F. evaporator

temperature.

Storage Bin:

Scotsman’s B90 will be the

presumed bin of choice. If using the

bin extension, install heavy duty leg

kit KLP4 and place the bin into

position.

Remove the paper tape from the bin

edge gasket, and install the bin

extension onto the B90.

Remove the paper tape from the bin

extension top edge, and using a

mechanical lift, install the FM2402RH

onto the top of the storage bin

assembly.

Fasten the ice machine to the bin

using (4) 5/15-18 2.5" cap screws.

Level the assembly by:

a. Turning the leg levelers in or out

on the standard legs.

b. Use shims under the heavy duty

legs of the KLP4.

Locate the Nameplate: The

nameplate is located on the back

panel of the machine, and contains

the electrical characteristics

particular to the unit being installed.

Refrigeration Installation:

The skills of a refrigeration technician are required

to connect the ice machine to the buildings

refrigeration system.

//////////////////////////////Caution/////////////////////////////

Connect to a R-22 system only.

////////////////////////////////////////////////////////////////////////

Local Codes must be observed.

A P-trap should be installed where there will be

more than 10’ of vertical rise in the suction line.

TYPICAL INSTALLATION: ALLOW ROOM FOR SERVICE ACCESS

FM2402RH

BIN

EXTENSION

B90 STORAGE

BIN

FM2402RH

August 1992

Page 3

FOR THE ELECTRICIAN

CONFORM TO ALL APPLICABLE CODES

Electrical Connections:

Locate the nameplate for the current

requirements, and then determine the

wire size and type per the National

Electric Code. The machine requires a

solid chassis to earth ground wire.

Refer to the wiring diagram. The ice

machine should be connected to its

own electrical circuit, and be

individually fused.

Voltage, when the unit is under full

load, must remain within the limitations

listed on page 2.

LOW VOLTAGE CAN CAUSE

EQUIPMENT MALFUNCTION

AND/OR DAMAGE

All external wiring should conform to

the National, State, and local electrical

codes. Usually the services of a

licensed electrician will be required.

DETAIL OF

JUNCTION BOX

JUNCTION

BOX

POWER SUPPLY

FM2402RH

August 1992

Page 4

FOR THE PLUMBER

CONFORM TO ALL APPLICABLE CODES

Water Supply:

The recommended water supply line is 3/8" O.D.

copper tubing, with a minimum operation pressure

of 20 PSIG, and a maximum of 120 PSIG.

Connect to cold water using the male flare

connection at the back of the machine. Install a

shut off valve in an accessible space between the

ice maker and the water supply.

Drain System:

All drains are of the gravity type, and must have a

minimum of 1/4" fall per foot of horizontal run. The

drains must be installed to conform to local

plumbing codes. The use of a vent at the machine

and at the bin will allow the system to drain

properly. Use only rigid tubing for drains; insulation

of the bin drain is recommended.

SHUT OFF

VALVE

FIELD

SUPPLIED

WATER FILTER

3/8" MALE FLARE

3/4" FPT

VENT THIS DRAIN

WATER INLET

BIN DRAIN

FLOOR DRAIN

FM2402RH

August 1992

Page 5

FOR THE INSTALLER: Final Check List

1. Is the unit installed where the air and water

temperatures are within and will remain within the

limitations for the unit?

2. Is there 6" clearance at the rear of the machine

for utility connections?

3. Has the water supply line be checked for

pressures between 20 and 120?

4. Has the unit been leveled?

5. Has the shipping material been removed from

inside the cabinet?

6. Have the electrical connections been made?

7. Have the drains been installed and checked for

leaks?

8. Has the refrigeration supply been installed and

checked for leaks?

9. Has the bin and cabinet been wiped clean or

sanitized?

10. Has the warranty registration card been

properly filled out and mailed to Scotsman?

11. Has the owner been given the service manual

and been instructed on how to maintain the

icemaker?

13. Has the owner been given the name and

telephone number of the local Scotsman service

agency?

FM2402RH

August 1992

Page 6

INITIAL START UP

1. Remove the top and front panels.

2. Open the water valve, and observe that the two

float reservoirs fill up with water and shut off.

3. Switch on the electrical power.

4. Open the hand valves (in the liquid lines).

5. Open the ball valves (in the suction lines).

6. Switch on one master switch, and observe:

The liquid line valve opens

The gearmotor runs

Within a short time, that side of the machine

begins to make ice.

Water flows from the water reservoir, and the float

drops, letting in more water.

7. Switch on the other master switch, observe that:

The liquid line valve opens

The gearmotor runs

Within a short time, that side of the machine

begins to make ice.

Water flows from the water reservoir, and the float

drops, letting in more water.

8. With both sides operating, the sight glass

should remain full, and the low side pressure will

be about 24 psig, + or - 2 psig. Gearmotor amp

draw should not exceed the nameplate rating.

9. Check the system very carefully for any

refrigerant leaks, repair as needed.

FM2402RH

August 1992

Page 7

COMPONENT IDENTIFICATION

Liquid line valve(s)

These valves operate to turn the ice making

process on and off.

When the ice level drops in the ice chute, the ice

level sensor will cause the circuit board to close

the liquid line relay, which energizes the liquid line

valve for that side of the system. The liquid line

valve opens, and liquid refrigerant flows to the

thermostatic expansion valve.

Thermostatic Expansion Valve

The metering device of each system, the valve(s)

sense the temperature of the suction line and vary

the amount of liquid refrigerant that passes

through the valve into the evaporator, thus

maintaining a constant level of refrigeration. TXV’s

are factory set. Do not adjust unnecessarily.

DO NOT ADJUST THE TXV UNTIL THE EPR

HAS BEEN SET.

The superheat setting is 4-80F. Measure the

temperature of the evaporator outlet at the TXV

bulb, and check the low side pressure at the EPR

valve (about 24 PSIG). Convert the pressure to

temperature (using a temperature pressure chart)

and subtract the amount from the outlet

temperature. The result is the superheat. Use an

electronic thermometer.

EPR: Evaporator Pressure Regulator Valve

This valve maintains a constant pressure on it’s

inlet (evaporators) side regardless of the pressure

on the outlet (suction) side. The EPR is factory set,

adjust only if needed. After adjusting check TXV

superheat.

Evaporators:

Where the water is frozen into ice crystals. As the

water cools, it begins to turn into ice, and the

slowly turning auger lifts the ice, as it is being

made, and forces it up and out of the "breaker" or

spout where the extra water is compressed out of

the ice. The ice then drops through the chute, into

the storage bin.

LIQUID LINE

VALVE

THERMO VALVE EPR VALVE THERMO

VALVE

EVAPORATOR

FM2402RH

August 1992

Page 8

COMPONENT DESCRIPTION: Control Box

Circuit Board: Controlling the ice machine

through sensors and relays. The sensors are: ice

level, and water level. The relays are for the gear

motor (with a built in time delay to clear the

evaporator of ice when the unit turns off) and for

the liquid line valve.

Transformer: Supplies low voltage to the circuit

board.

On/Off Switch: Manual control for that side of the

machine.

ON/OFF SWITCH

TRANSFORMER

CIRCUIT

BOARD

TERMINAL STRIP

FM2402RH

August 1992

Page 9

COMPONENT DESCRIPTION: Evaporator

Evaporator: A refrigerated vertical tube filled

water and containing a water seal and auger.

Auger: A solid stainless steel double spiral auger,

it pushes the ice crystals up to the top of the

evaporator.

Water Seal: A two part "face" seal, the top half

rotating with the auger, the bottom half stationary,

the sealing action being where the two seal "faces"

meet.

Ice Sweep: A plastic cap with "fingers". It revolves

with the auger to "sweep" the ice into the ice chute.

Divider: Where the ice is compressed and much

of the extra water is squeezed out of it before it is

discharged into the bin.

Motor: A motor that drives the gear reducer.

Bearing: As the ice is pushed up the evaporator,

the auger is thrust down, and pressure from the

auger thrust is taken up by this bearing.

BEARING ICE SWEEP

DIVIDER

EVAPORATOR

AUGER

WATER

SEAL

MOTOR

FM2402RH

August 1992

Page 10

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