Scotsman FM1202RL User manual

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.

This Remote Low side unit 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-404A system.

Table of Contents

FOR THE INSTALLER: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2

FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

FOR THE INSTALLER: Final Check List Initial Start Up . . . . . . . . . . . . . . . . . . Page 6

COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . . Page 8

COMPONENT DESCRIPTION: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . Page 9

ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14

CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . Page 16

REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . Page 19

REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20

REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21

REMOVAL AND REPLACEMENT: Evaporator . . . . . . . . . . . . . . . . . . . . . . . Page 22

REMOVAL AND REPLACEMENT: Gearmotor . . . . . . . . . . . . . . . . . . . . . . . Page 23

CIRCUIT BOARD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24

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

This manual was printed on recycled paper. Keep

it for future reference.

Note the Warning symbol where it appears. It

marks a potential hazard.

Single System RL

January 1997

Page 1

FOR THE INSTALLER: Specifications

The unit is designed to fit a variety of Scotsman

storage bins. See sales literature for more

information.

Installation Limitations: The remote low side 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.U.L.

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.

Model Cabinet Size System Refrigerant BTUH required Voltage Ice Type

FME1200RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Flaker

NME950RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Nugget

FM1202RL 21"w x 27"h x 24"d R-22 8,000 208-230 Flaker

NM952RL 21"w x 27"h x 24"d R-22 8,000 208-230 Nugget

FME1500RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Flaker

NME1250RL 21"w x 27"h x 24"d R-404A 8,000 208-230 Nugget

Single System RL

January 1997

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 building’s

refrigeration system, check to be

sure that the system has enough

extra capacity to handle a minimum

of additional 8,000 BTU’s per hour @

1100F. liquid line temperature

(assume a 00F. evaporator

temperature).

Storage Bin:

Using a mechanical lift, install the ice

machine onto the top of the storage

bin.

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.

Notes:

•Suction Line and Liquid Line

Stubs are at the back of the

cabinet.

•1.5 ounces of the appropriate

refrigerant is in the system as a holding charge.

•Be sure there is enough BTU capacity.

•Be sure that the liquid connection is NOT in

series with another liquid line valve.

•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

FME1200RL

BX87 BIN

EXTENSION

B90 STORAGE BIN

Single System RL

January 1997

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 it’s

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

Single System RL

January 1997

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 80 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

Single System RL

January 1997

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 80?

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 ice

maker?

13. Has the owner been given the name and

telephone number of the local Scotsman service

agency?

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 valve (in the liquid line).

5. Open the ball valve (in the suction line).

6. Switch on the 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. When operating, the sight glass should remain

full, and the low side pressure will be about:

RLE1202/952 - 25 PSIG + or - 2 PSIG

RLE1200/950 - 36 PSIG + or - 2 PSIG

RLE1500/1250 - 25 PSIG + or - 2 PSIG

Gearmotor amp draw should not exceed the

nameplate rating.

8. Check the system very carefully for any

refrigerant leaks, repair as needed.

Single System RL

November 1999

Page 6

COMPONENT IDENTIFICATION

Liquid line valve

This valve operates 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. The liquid line valve opens, and liquid

refrigerant flows to the thermostatic expansion

valve.

Thermostatic Expansion Valve

The metering device of the system, the valve

senses the temperature of the suction line and

varies 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. 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 its

inlet (evaporator) side regardless of the pressure

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

set, adjust only if needed. After adjusting, re-check

TXV superheat.

EPR Settings:

RLE1202/952: 25 PSIG + or - 2 PSIG

RLE1200/950: 36 PSIG + or - 2 PSIG

RLE1500/1250: 25 PSIG + or - 2 PSIG

Evaporator:

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

Single System RL

November 1999

Page 7

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

Single System RL

January 1997

Page 8

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 split phase 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

Single System RL

January 1997

Page 9

ELECTRICAL SEQUENCE

Refer the wiring diagram as needed.

Each system is separate

If the machine is switched off at the master switch,

but is otherwise ready to go, switching the master

switch to on does the following:

•The bin empty light on the circuit board goes on

•There is a 15 second delay

•If there is enough water in the reservoir, the

circuit board will allow the machine to start up.

Start up consists of:

•The liquid line relay and auger motor relay

become energized, connecting power to the

windings of the auger motor.

•The auger motor starts, and the centrifugal

switch closes, connecting power to the liquid

line valve coil.

•The liquid line valve opens, and the refrigerant

flows to the thermostatic expansion valve and

into the evaporator.

•As ice goes past the ice level sensors, the bin

empty light will stay on, and the machine will

continue to run, unless the ice stays between

the sensors for more than 15 seconds (bin full).

At that point, the bin empty light goes out, and

the machine shuts down.

Shut Down consists of:

•The liquid line relay opens.

•The liquid line valve closes

•Ice making stops

•The auger motor is run by the circuit board for 2

more minutes, clearing out ice in the

evaporator, and then

•The auger motor relay opens, and the auger

motor stops.

If the ice level sensor is clear (bin empty) for more

than 15 seconds, the machine will start up again.

Another purpose of the circuit board is to turn the

machine off if there is not enough water in the

machine.

•When the water level in the reservoir falls

below the water level sensor, the machine will

"shut down"

•When the water refills the reservoir, the

machine will start up again.

Separate from the circuit board:

•The master switch is the manual control for

each system, but it is not a service disconnect.

Single System RL

January 1997

Page 10

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