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