Scotsman FM2402RH 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 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
15
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