Scotsman FM2402RH SERVICE MANUAL

TO THE OWNER OR USER:

FM2402RH

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.

August 1992

Page 1

2.7

16,000

Minimum

Circuit

Ampacity

BTU’s

Required

POTABLE WATER INLET 3/8" FLARE

DRAIN 3/4" FPT

FM2402RH

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

BACK VIEW

20.84"

9.43"

5.25" 3"

15.53"

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

3.1"

SUCTION LINE CONNECTION

LIQUID LINE CONNECTI0N

⁄8"

⁄2"

17.8"

18.8"

21.66"

designed for indoor installations only. The machine must also be in a controlled environment where the air temperature does not fall below 50 go above 100

The water temperature must be between 40 and 100

F., or

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.

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

Model Number Dimensions (w/o Bin)

H" x W" D"

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

Ice

Type

Basic

Electrical

ELECTRICAL INLET

Maximum

Fuse

Size

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 @ 110 Assume a 0 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.

F. liquid line temperature.

F. evaporator

TYPICAL INSTALLATION: ALLOW ROOM FOR SERVICE ACCESS

FM2402RH

BIN

EXTENSION

B90 STORAGE

BIN

//////////////////////////////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.

August 1992

Page 3

POWER SUPPLY

FM2402RH

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

August 1992

Page 4

FOR THE PLUMBER

3/8" MALE FLARE

VENT THIS DRAIN

CONFORM TO ALL APPLICABLE CODES

FM2402RH

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:

SHUT OFF

VALVE

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.

3/4" FPT

WATER INLET

BIN DRAIN

FLOOR DRAIN

FIELD

SUPPLIED

WATER FILTER

August 1992

Page 5

FM2402RH

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?

August 1992

Page 6

INITIAL START UP

FM2402RH

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.

August 1992

Page 7

EVAPORATOR

FM2402RH

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 4-8 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

F. Measure the

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.

THERMO VALVE

LIQUID LINE

VALVE

EPR VALVE

THERMO

VALVE

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.

FM2402RH

ON/OFF SWITCH

TRANSFORMER

CIRCUIT

BOARD

TERMINAL STRIP

August 1992

Page 9

+ 18 hidden pages