Scotsman FM2400RL 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.
The 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 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 . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
INITIAL START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . . Page 9
COMPONENT DESCRIPTION: Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . Page 17
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.
Double System RL
March 1997
Page 1

FOR THE INSTALLER: Specifications
The machine is designed to fit the Scotsman
storage bins BH800 or B90. Leg kit KLP4 is
recommended when using both the B90 bin and
an extension.
Installation Limitations: The machine 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.
15.53"
3.1"
SUCTION LINE CONNECTION 7⁄8"
LIQUID LINE CONNECTION 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
Model Cabinet Size System
Refrigerant BTUH required Voltage Ice Type
FME2400RL 42"w x 27"h x 24"d R-404A 16,000 208-230 Flake
NME1850RL same R-404A 16,000 208-230 Nugget
FM2402RL same R-22 16,000 208-230 Flake
NM1852RL same R-22 16,000 208-230 Nugget
Double System RL
March 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 R-404A 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 BX87,
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 FME2400RH 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.
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 enought BTU capacity.
•Be sure 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
Ice Machine
BX87 BIN
EXTENSION
B90 STORAGE BIN
Double System RL
March 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
Double System RL
March 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
Double System RL
March 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?
Double System RL
March 1997
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:
That 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
2400 or 1850 models (R-404A) 36 PSIG, + or - 2
2402 or 1852 models (R-22) 25 PSIG, + or - 2
Gearmotor amp draw should not exceed the
nameplate rating.
9. Check the system very carefully for any
refrigerant leaks, repair as needed.
Double System RL
March 1997
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. 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 (evaporators) 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:
R-22 models (2402/1852): 25 PSIG
R-404A models (2400/1850): 36 PSIG
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
Double System RL
March 1997
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
Double System RL
March 1997
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 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
Double System RL
March 1997
Page 10