Cornelius 500 - Series User manual

$5
.P
Quality Designers & Manufac Maker Industry
- I &*.". % - I ~
IMI CORNELIUS INC.
MODULAR
CUBED
ICE MAKER
SERVICE MANUAL
SERIES 500
MANUALPART NUMBER 16-1 951 -81 2 REV "B"
1
THIS DOCUMENT CONTAINS IMPORTANT INFORMATION
This Service Manual must be read and understood before the installation and operation of this Ice
Maker.
IMI Cornelius Inc. 04-94

Part # Corrections/Update Document
Unit Type/Model # Manual #
Series 500 161951812
Page Item Old Part Description New Part Description Agent Date Notes
21 1 161079002 Control board 161456038 Control board KC 6/15/04
21 5 42297 Dump valve 161456010 Dump valve KC 6/15/04
21 21 41448 Reservoir water 631500008 Reservoir water KC 6/15/04
21 38 28883 Capacitor run 630900732 Capacitor run KC 6/15/04

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t
DESCRIPTION
Control, Circuit Board
Switch, On-Off-Clean
Switch, Harvest-Bin Prox.
Relay, Power
Valve, Water Dump Solenoid
Plug, Dump Valve
Drier
Valve Crankcase Pressure Reg.
Valve, Shrader
Core, Shrader Valve
Cap, Shrader Valve
Compressor
Motor, Fan
Blade, Fan
Shroud
Condenser
Pump, Water
Valve, Thermo Expansion
Valve, Hot Gas
Tube, Water Panto Pump Inlet
Strainer, Water
Reservoir, Water
Float and Valve
Bracket, Float and Valve
Tee
Orifice, Restrictor
Evaporator
Distributor
Asy, Water
Tube Inner, Distributor
Tube Outer, Distributor
Cap w/o Hole, Distributor
Cap w/Hole, Distributor
Cover, Evaporator
Bracket, Front Cover Mount
Kit, Evaporator Sensor
Switch, Water Dump Valve
Bracket, Back Cover Mount
Shield, Splash
Sensor, Thermo
Press Control
Asy
Relay, Start
Capacitor, Start
Capacitor,
Run
Cap, Reservoir Drain
Valve, Water
Condenser Sensor
Suction Line Sensor
AIC WIC
PIN PIN
161 4 5603%
L
161297002 161297002
43446 43446
164884004 164884004
45880 45880
21850 21850
164876001 164876001
20654 20654
21214 21214
23988 23988
162964004 162964004
161871002 07470
Ir
38669 09355
38754
N/A
38668 22499
41011 41011
161921001
z- 161921001
09214 09214
165636003NL165636003
08023 08023
ft848'631gw8-
165681000 165681000
165692001 165692001
00987 00987
22176 22176
45905 45905
43056 43056
45899 45899
45902 45902
164951002 164951002
164951001 164951001
166050001 166050001
43530 43530
161456002 161456002
45866 45866
38743 38743
41464 41464
39130 39130
N/A 39404
161998004 161998004
161165002 161165002
28883 28883
45681 45681
N /A 01211
38703 38703
38703 38703
.4;h2BF- -q%ICIS@I 0
17

Y
18
c

......
TABLE OF CONTENTS
INTRODUCTION ........................................... 1
STACKING KIT INSTRUCTION ....................... 8
STACKING KIT ILLUSTRATION ...................... 9
SPECIFICATIONSFOR 500 ............................ 2
......................................
UNPACKING ................................................ 3 WIRING DIAGRAM 11
LEVELING ................................................... 3
SANITIZINGAND CLEANING PROCEDURE ...... 12
DIAGRAM 1 ................................................ 3
DIAGRAM 8 ................................................ 12
....................... ............
UNIT LOCATION .......................................... 3 WATER TREATMENT ! 12
.......................................
UNIT SET-UP ............................................... 3 WINTER STORAGE 12
DIAGRAM 2 4 . CLEANING THE CONDENSER C.OIL ................,. 13
POWER SUPPLY CONNECTIONS .................... 4
TROUBLESHOOTINGSOLID STATE BOARD ..... 15
PLUMBING CONNECTIONS ........................... 4
TROUBLESHOOTINGTHE SENSORS ............... 15
................................................
DIAGRAM 3 ................................................ 4 DIAGRAM 9 15
DRAIN ........................................................ 5 REPLACEMENT OF SENSORS ......................... 16
DRAIN CONNECTIONS ................................. 5 REMOVALOF SOLID STATE CONTROL 16
f.. 29
..........
WATER LEVELRESERVOIR ........................... 5
REINSTALLATION OF SOLID STATE CONTROL 16
PARTS LIST. ................................................ 17
ILLUSTRATIONPARTS BREAKDOWN ............. 18
DIAGRAM 4 ................................................ 5
STARTING THE UNIT ................................... 5
DIAGRAM 5 ................................................ 6
MOUNTING ON DRINK DISPENSERS ............. 6
ELECTRICAL CIRCUIT ................................... 6
DIAGRAM 6 ................................................ 6
ADJUSTMENT FOR ICE BRIDGE ..................... 7
DIAGRAM 7 ................................................ 7
CHECKOUT FOR HARVEST SWITCHES ........... 7
ADJUSTMENT FOR HARVEST SWITCHES ....... 7
3

SPECIFICATIONS
es.00
L
500 SERIES
1.00 J--1"*"7
7 21.00
_il -3
A WATER INLET
/ B PUMP OUT DRAIN
30.00 C ELECTRICAL CONNECTION
D CONDENSATE DRAIN
E CONDENSER WATER OUT)(W/C ONLY)
BACK VIEW
F CONDENSER [WATER iN)(w/C ONLY)
BOTTOM VIEW
ICE PRODUCTION CAPACITY (approximate)
1 Model Number I Ambient I Incoming Water Temp F
Compressor Electrical Rating ........................................ 3/4 H.P.
Compressor Model ...................................................... Tecumseh AK9474J
Condenser
................................................................. Air or Water Cooled
Refrigerant Charge
......................................................
AC - 30 02. R-22
Refrigerant Control.
..................................................... TXV
TXV Superheat Serting
................................................ 6O to loo
Inlet Water Supply ..................................................... .3/8" SAE Male Flare
Voltage
.................................................................... .1 1 5V-60hz-1ph
Total Amp. Draw..
..................................................... .10.0 amps
........................................................................... WC - 24 OZ. R-22
2

".
1"
UNPACKING ," L
1. Uncrate machine and/or bin by re-
I moving the staples from around the
bottom of cardboard crate and lift
off.
2.
Remove bolts fastening the crate skid
tothe bottom of
the unit. If auxiliary
legs have been purchased for
the
bin, they should be installed at this
time.
LEVELING
If legs are used, adjust the leveling
legs of the storage bin
until the unit is
level and
all four (4) legs are in solid
contact
with the floor. Leveling is
very important to obtain proper
draining and to maintain
the proper
level
in the water pan of the ice cu-
ber.
NOTE: If the bin is to be installed flush to
the floor, the machine must be sealed to the
floor with
an approved mastic such as Daw
) R.T.V. #732, 734, or G.E. #102, 108. This
is an
N.S.F. requirement and is the
responsibility of the installer.
UNIT LOCATION
1 Allow at least a minimum of six (6)
inches at the rear and side of the ice
machine for proper air circulation.
2.
This unit has been designed to be in-
stalled in an indoor location which is
clean and which can be adequately
ventilated. The air and water
temperatures should never exceed
looo F or fall below 50° F.
(Temperaturesabove looo F will cut
the ice making capacity below an
economical level. Temperatures
below
SOo F will cause a malftpction
of thermostatic sensors).
3.
The unit should be located where air
circulation is not restricted. The unit
should not be located near a kitchen
grill. Air which contains grease va-
pors will deposit grease on
the con-
denser. The condenser should al-
ways be kept clean.
UNIT SET-UP
1.
Take off front panel of machine and
remove hardware bag or service
manual envelope with
the water
strainer enclosed.
2.
Mount the ice maker to the top of the
ice storage bin or adapter in the
proper position over the ice drop
opening. The ice maker must then be
sealed both on
the outside and the
inside bottom edges with an ap-
proved
N.S.F. mastic such as Dow
R.T.V. #732, 734, or G.E. R.T.V.
#102,
108. This is and N.S.F.
requirement and the responsibility of
the installer.
3. Remove shipping tape from evapora-
tor curtains.
Diagram
1
3

MAKE PLUMBING CO NNECT IONS
I I
ILL030
Diagram 2
MAKE ELECTRICAL POWER SU PPLY CON-
"
Requirements: 11W60hz. 1 ph. or 220v
50hz.
1 ph when used.
REFER TO SERIAL PLATE FOR MINIMUM
CIRCUIT AMPACITY AND MAXIMUM TIME
DELAY FUSE
SIZE.
ALL WIRING MUST CONFORM TO NA-
TIONAL AND LOCAL ELECTRICAL CODES.
BQlE TAKE CARE NOT TO
KINK
OR COLLAPSE
VINYL TUBING.
Water supply - (Install per local codesHSee
diagram
3)
The water inlet connection to the unit is a
3/8" male flare connection located at the
rear of the ice machine.
WARNING: N the water pressure exceeds
50 pounds, a water pressure regulator
should be installed in the water inlet
line
between the water shut-off valve and the
strainer.
Install a reducer fitting on the shut-off valve
to accommodate
the water strainer, which is
supplied
with each ice machine and MUST
be used. Install the water strainer
with the
arrow in the proper direction of flow and
with
the clean out plug down. This is very
important for cleaning. Connect either
3/8"
or 1/2" copper tubing between the water
inlet fitting of the ice machine and the water
strainer.
For water cooled units, two water inlet con;
making (evaporator) section which
is located
on the back
of the machine and is a 3/8"
flared connection. The other is for the wa-
ter cooled condenser.
nections are provided. One for
the ice' E
POWER CORD
/ (322 UNIT ONLY)
SERVICE VALVES
30 PSI MAX.
\ WATER SUPPLY
ICE MAKlNC
' WATER SUPPLY
WC CONDENSER
DUMP VALVE DRAIN
PLUMBING MUST BE
DONE PER LOCAL
CODES.
Diagram 3
4

The regson for the separate water inlet con-
nections is that some instalkions use a
water tower for cooling
the water used in
the water cooled condenser and some instal-
' lationsuse treated water (filtered) for the ice
making inlet water connection. Be sure to
install water line (incoming) tothe
318" male
flare connection on
the back of the unit that
supplies water
to the water regulating valve
inside. The setting of the water regulating
valve from
the factory should be 240 PSlG
for
R-22 units. NOTE Always flush out
water lines before starting unit.
Adjustments, if necessary, should be done
at installation.
'
Provide a suitable trapped open drain as
close as possible to
the area where the ice
maker is going to be installed. This may be
an existing floor or a
1-114" trapped open
drain. Two separate drain lines are required
for air cooled units, one for
the storage bin
and one for the dump valve drain hose.
An additional separate drain line will be re-
) quired for water cooled units from the outlet
of
the condenser coil to the drain. Run all
gravity drain lines with a good fall to the
open drain.
ALL PLUMBING MUST BE INSTALLED IN
ACCORDANCE WITH LOCAL CODES.
NOTE: ln some cases it may be necessary
to insulate the water supply line and drain
line. Condensate dripping to the floor can
cause serious staining
of carpets or hard-
woods.
WATER LEVEL RESERVOIR
The Float Valve is mounted in a fixec
position thru it's mounting bracket to
maintain the proper water level
in the water
reservoir. For the
500 series units the
bracket is mounted thru the top hole of the
bracket.
SUPPORT, I
n\WEB \ ADJUST I
WATER
FLOAT
LEVEL
ASSEMBLY
Diagram 4
WARNING: Ice maker will not operate prop-
erly when water supply temperature
is be-
low
50° F or sbove looo F.
Water supply
pressure must not exceed
50 PSI.
STARTING THE UN IT
After the ice cuber has been unpacked and
leveled and
all plumbing and electrical con-
nections
have been made, start the unit, and
check for proper operation.
1.
DRAIN CONNECTION INSTALLATION IN-
STRUCTIONS
Taking care not to kink or collapse vinyl
tubing at any point, route tubes to any open,
trapped or vented floor drain. Run tubing
to
drain separately. Do not tee any drain hoses
together. Add drain tubing required to reach
b floor drain.
A cuber has three separate circuits: the
water circuit, the refrigerant circuit and the
electrical circuit.
Start checking the water circuit
by
making sure that there are not thread
or flare joint teaks, either outside
the
unit or in the compressor section.
Next check
the water flow over the
evaporator and make sure that all
holes in the water distributor are
open, (See Diagram
5) and that there
is no undue splash or
loss of water
into
the ice bin.
Also check to see if
the float valve is func-
tioning properly and
the correct water level
is being maintained. Re-adjustif necessary.
5

2.
3.
WATER '4
DISTRIBUTOR
HOLES
ILL025 -
Diagram 5
Check the refrigerant circuit by mak-
ing sure that the condenser fan is
running. (This
will be evident by air
noise.) Is the compressor running?
(Feel the casing for vibration.)
Is the
evaporator getting cold.
Check bin-harvest switch operation.
(See procedure
in manual).
ELECTRICAL CIRCUIT SEQUENCE OF
DPERATION
An L.E.D. digit display mounted on the solid
state control board will show
a status
number
0, 1, 2, 4, & 6 and a decimal point
to indicate what is happening
in the
operation of the unit.
The electrical sequence of operation you will
see on the digit display for
a normal ice
making cycle
will be as follows:
The status number
0 will be shown telling
you
the unit is making ice. The solid state
control
DELAYS the start of the water pump
until the evaporator temperatures reaches
20° F. Approximately six minutes after the
start up in the freeze cycle a decimal point
will appear to the lower right of
the "0" to
tell you
that the evaporator sensor has been
switched on. After the evaporator
temperature has pulled down low enough for
the correct amount of ice to be on the
evaporator, the decimal point will begin to
flash and stay flashing for approximately
20
seconds. If evaporator stays below the set
number
"1 " on the digit display will indicate
that
the machine is in its harvest cycle with
the hot gas valve open. The water pump
continues to operate and
the water dump
solenoid valve is now open. The water
pump shuts off approximately
15 seconds
later after
the water reservoir is pumped out.
point,
the harvest cycle will start. A
PLEASE NOTE; During the freeze cycle in
low ambient condition the condenser fan
motor will be cycled
on and off throygh the
condenser sensor and solid state control
board. The fan cycling pressures in relation
to the temperatures sensed will be
approximately
180# for cut out and 230#
for cut in of the fan motor.
I
Diagram 6
6

ADJUSTMENT FOR ICE 8 RIDGE THICKNESS CHECKOUT
.- PROCfiDUjW FOR HARVEST
BIN SWITCHES
An ice bridge connecting all cubes is neces-
sary for a proper harvest of discharge of
cubes from the evaporator.
1
To increase ice bridge thickness carefully
turn adjustment screw counter-clockwise
11p
more than one turn at a time. Wait and
check thickness befora re-adjusting.
(See
Diagram 6 & 7)
Turn on the ice machine and move the
evaporator curtain(s1 away from the evapo-
rator(s1. The ice machine should
then shut-
off
in approximately 8 seconds. (See detail
A
& B).
Slowly let the evaporator curtain(s1 move
back toward the evaporator(s1
until the bot-
tom edge
of the curtainfs)is at least at edge
on
the water reservoir or closer to the evap-
orator. With
the curtainb) at that position,
the machine should start. (See detail,C).
ADJUSTMENT PROCEDURE FOR HARVEST
BIN
SW ITCHES
c
If adjustment is necessary, loosen acorn
nuts and move proximity switch closer to
the curtaints1 and make sure the curtain is
properly mounted. (See detail
A).
Re-check per above procedure.
Diagram
7
DETAIL ” B”
\
\
THERMOWELL
EVAPORATOR
CURTAIN
DETAIL ”A”
7

STACKING KIT INSTALLATION
INSTRUCTIONS
5 - Screw 8/32 x 318
2 - Tie strap
1
- Ice slide diverter
1
- Retainer shield assembly
1
- Interfacecable
PLEASE SEEUSTRATlONS FOB
PEFERENCE FOR THE FOLLOW1NO INSTALL
PROCEDURE
1.
2.
3.
4.
5.
6.
7.
After the bottom
unit of the stack
has been positioned on the bin,
the
sealing gasket supplied with second
unit must be cemented to the base.
Nearly any adhesive can be used,
however
it should not be water
soluble. This
is an N.S.F. requirement
and the responsibilityof the installer.
Remove the top and front panels
from bothunits.
Mount
the unit on top of the bottom
one of the stack.
(It is not
recommended to stack more than
one
unit.)
Removeevaporator curtain cover.
N
/A
Put the ice slide diverter through the
top
unit evaporator section and hook
over the front edge of the top
unit
water reservoir.
Secure ice slide diverter to
the back
wall of the lower unit
with a provided
screw.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
Insert
the retainer shield from the
front of the lower unit evaporator
section and align
the holes to the
diverter and support bracket and
secure
with the screws provided.
Remove electrical box covers from
bothunits.
Remove lowest grommet from
the
left side of each electrical box.
Insert the interface cable through
each hole and insert into the split
grommets.
NOTE; The cable will fall
across the front of both mbchines
with the front panel covering the
cable.
Reinstall grommets into electrical
box.
Plug the interface cable end into the
open middle left socket on each solid
state board being careful to make
sure of a good connection.
t
Replace electrical box covers. d
-
Plug the weld nut hole found to the
right of the compressor with RTV
sealant.
Remove
the screws from both sides
of bothunitsand insert the tie straps.
Reinstall screws.
When reinstalling
the front panels,
take care
in the positioning of the
interface cable.
i
8

STACKING KIT ILLUSTRATION
i
RETAINER I
c
S
CABLE u
FILL & SEAL HOLE
TIE W/RTV SEALANT
STRAP
a
9
ILL 154

I 11
OUTLET BOX
BK
.---- ----&
COMPRESSOR COMPRESSOR I '
RUN START
COMPRESSOR CAPACITOR CAPACITOR
j ,
POWER RELAY
BK
wn
i
d.
r OR
yL
COOLING FAN
NOTOR
OR
r
IWH
WH
BK l-' WH
OR
BK
I
BK
lb :* yL - I (W/C ONLY) WH
-
I
I
I
I
ON
SWITCH
START RELAY
BR CONDENSOR
FAN MOTOR
(A/C ONLY)
WH
- OR '10: OR -
L-----J
HIGH PRESSURE
CONTROL(W/C ONLY)
WH WH
WATER DUMP
VALVE
I
HOT GAS
SOLENOID
WH
J
WATERPUMP
BK
I
RD
RCV-
I
CONTROL
I
BL rhl ~- 1
115 VOLTS 60 HZ
<CAD
IMI CORNELIUS INC.
NOTES: The solid state control DELAYS the start of
the water pump until the evaporator
temperature reaches
20' F.
IMPORTANT: White and black connector blocks are
-KEYED- and MUST be inserted correctly
on circuit board.
10
111149

/
I 1 7
COMPRESSOR COMPRESSOR
RUN START
CAPACITOR CAPACITOR
POWER RELAY COMPRESSOR
WH -
YL
COOLING FAN
MOTOR
OR
W H
BK
OR
BK WH
(W/C ONLY) 7 WH
--Lt. BL-
CONDENSOR
UNIT
START REUY
OW
ON
I
BL
WH
FAN MOTOR
(A/C ONLY)
HIGH PRESSURE
CONTROL(W/C ONLY)
I
RCV-1
CONTROL
1
1. w.4 IM
.an-
WATER DUMP
VALVE
HOT GAS
SOLENOID
OPTIONAL RD
REMOTE
l~ul uom gg,
L
RI. d
wH
WH
m
--
CY
I WH
208/230 VOLTS 50 HZ
<CAD
IMI CORNRLIUI INC.
NOTES: The solid state control DELAYS the start of
the water pump until the evaporator
temperature reaches
20' F.
White and black connector blocks are
-KEYED- and
on circuit boa
11
ill 150

SANITIZING AND CLEANING PROCEDURE
11,. 08
\A-
1.
Remove front panel to gain access to
the on-off-clean switch.
lUlY
2.
Push switch to "clean" and allow the
ice on the evaporator to release or
meltaway.
3.
Remove ice from storage bin.
4.
If lime scale is present add 2 02. of
"Lime-A-Way" or "Calgon Nickelsafe
Ice Machine Cleaner" directly into
water reservoir. Circulate for no
longer than
15 minutes. Depress
dump valve switch on control box
and allow cleaner or sanitizer to drain
away. Allow float valve to fill
reservoir
with clean, fresh water.
Circulate for approximately
1 minute.
Depress dump valve switchand allow
water to drain away. Repeat three
times.
CAUTION:
All ice machine cleaner must be
flushed out
of the system before the sanitiz-
ing solution is used in Step
5. The reaction
of the two chemicals can cause hazardous
gases to be generated.
5.
Pour 112 02. of household bleach into
the water reservoir and circulate for
15 minutes to sanitize the circulating
water system including the evapora-
tor, pump, distributor and all inter-
connecting vinyl tubing. Depress
dump valve switch on control box
and allow cleaner or sanitizer to drain
12
6.
A.
B.
C.
7.
8.
9.
away. Allow float valve to fill
reservoir
with clean, fresh water.
Circulate for approximately
1 minute.
Depress dump valve switch and allot
water to drain away. Repeat three
times.
Mix a sanitizing solution of
1/2 02.
household bleach to one gallon of
water. This mixture
will provide 200
ppm cholrine. Using a non-metallic
bristle brush, scrub the following:
Inside surface of the ice bin including
top and door.
Inside surface of the ice maker to
in-
clude evaporator section in the ice
machine including the top, front panel
and evaporator splash curtain.
c
Make sure splash curtain is correctly
positioned.
Depress
dump valve switch on
control box and allow cleaner or
sanitizer to drain away. Allow floa'
valve to fill reservoir
with clean, fresh
water. Circulate for approximately
1
minute. Depress dump valve switch
and allow water to drain away. Re-
peat three times.
1
-
Push switch from "clean" to "on"
position.
Replace front panel.
WATER TREATMENT
Depending
on the water source for the ice
maker, water treatment may be necessary
to prevent calcium or lime scale deposits,
bad taste and odor, clorine problems, as well
as slime growth. If these conditions exist,
contact your Cornelius Distributor or Dealer
for information on water treatment systems
Cornelius offers.

WINTER STO RAGE
If the unit is to be stored in an area where
the temperature will drop below freezing, it
is most important that all water lines be
drained to prevent them from freezing and
possible rupture.
To blow out the waterline, disconnect the
water supply at
the cabinet inlet and use air
pressure to force the water into
the water
reservoir pan. This can then be removed
from the water pan.
.Remove
th.e front Qanel of the machine.
With a vacuum cleaner, remove all
accumulated dust and
lint that has adhered
tothe finned condenser.
CAUTION; Condenser cooling fins are
sharp. Use care when cleaning.
1. If the condenser is being cleaned
from
the back of the machine, re-
move all accumulated dust, dirt, etc.,
that
has adhered to the finned sur-
face with a vacuum cleaner.
CLEANING THF~ =DENSER
2.
If the unit is being cleaned from the
In order to produce at full capacity, the re- front, remove front panel,
tu+ the
frigeration condenser must be kept clean. power switch off and blow through
The frequency of cleaning
will be determined
the finned surface of the condenser
by surrounding conditions.
A good past the fan blade to remove
maintenance plan calls for an inspection
at
accumulated dust, etc.
least every twomonths.
13

STATUS INDICATOR
STATUS
0
1
2
4
6
EXPLANATION POSS IBLE C AUSE
Unit is in freeze cycle, making
ice, no problems.
Unit is in harvest cycle, ice
should drop shortly, no problems.
Indicatesa full bin condition,
unit off, water curtain being held
open
with ice.
Unit
p4f Que tosuction line not
pulling down toat least
40OF.
Unit is p4f due to condenser
temperature climbing too high.
Manual reset required.
Decimal
Point
OFF
Indicatesthat all sensors, except
condenser, are switched off for
first six minutes of freeze cycle.
Decimal Indicatesthat evaporator and
switched
" 0 N " .
Point suction line sensors have
ON
Decimal Indicatesevaporator temperature
Point has pulled down and
unit will go
FLASHING into harvest after time delay.
If
"2" isshown but binisn't full,
check for individualcube holding
curtain open. Harvest Bin switch
not adjusted properly.
Low on refrigerant. Defective
TXV. Compressor defective or
inefficient. Defective power
relay, won't close. Defective
start relay, won't start
compressor.
Low voltage tocompressor, no
start. DefectiveC.P.R. valve.
Defectivesensor (brownwire).
SENSOR NOT INSULATED
PR 0 PER LY.
Dirty condenser. Defectivefan
motor or blade." Gross over-
charge. Extremely high ambient
temperature, above
12OOF.
Defective sensor (orange
wire).
* *
Normal time delay, approximately
6 minutes.
Normaltime delay, approximately
20 seconds before harvest cycle
begins.
FOR MANUAL RESET
- PUSH MASTER SWITCHTO "OFF" - WAIT 10 SECONDS -
PUSH TO "ON' OR PUSH RESET BUTTON
*Not applicable to Water-cooled units.
* 'Not applicable to Remote units.
14

Y
i,; *: ?
TROUBLE SHOOTING THE SOL ID STATE
CONTROL BOARD
To determine if the circuit board and sensors
are functioning correctly under all operating
parameters, the adverse conditions must be
simulated to check out
the digital display
status numbers.
I
PROCE DURE
1. To check #6 sensor - Block
condenser fan blade on start up. Condenser
should get hot
within two minutes and shut
unit off on #6 condensertoo hot.
2. To check #4 sensor - Remove
suction line sensor from thermowell anytime
during freeze cycle. Machine should shut-
off on
#4, suction line too warm when the
evaporator temperature gets low enough to
start the harvest cycle.
3. To check #2 sensor - Hold
water curtain open anytime after unit goes
into harvest. Machine should shut down
within approximately
8 seconds on #2, full
) bin.
4. To check #1 sensor - Push
defrost button anytime during freeze cycle
and
unit should go into harvest. #1
indicates a harvest cycle, no problems.
5. To check #O sensor -A "0" indicates
that the
unit is in the freeze cycle and there
are no problems.
PLEASE NOTE: In rare cases a "0" can be
displayed on the control board and the
compressor not running in water cooled and
remote air cooled machines. If this occurs,
the manual reset high pressure control will
be open and must be reset for proper
operation. The control is located in the
upper rear, right corner of the compressor
compartment.
After reset, check out the machine for the
possible causes of the problem.
'15r
TROUBLESHOOTING THE SENSORS
1.
2.
3.
4.
5.
6.
7.
8.
Turn off power to machine.
Remove the front panel and electrical
box cover of the machine.
Cut the Luspected sensor wire at
least six inches from
the thermowell
in which it is located.
Remove
the sensor from the ther-
mowell.
Carefully separate
the wires and strip
the insulationoff
the end.
Pack a glass or container
with ice
and add some water to make an ice
water solution. Check
the tempera-
ture of the ice
water with an accu-
rate thermometer. Ice water must be
32O F.
.
L
Insert the sensor into the ice water
and soak for a minimum of two min-
utes.
With a zerod ohmmeter, measure
the
resistance across the two wires of
the sensor lead.
It should read 281 5
ohms + or -10% (281 ohms) on
units built before March
1994; + or -
5% (140 ohms) on units built from
March on.
NOTE: If the above ohm reading is not
within the range stated, the sensor is bad
and should be replaced.
I ILL058
Diagram 9
15

RECONNFCTION OF A GOOD OR RE-
PLACEMENT SENSOR AFTER TROU-
BLESHOO TlNG
1. Carefully separate the wires of the
sensor leads coming from the solid
state control and strip the insulation
off the end of each wire.
2.
Reconnect the sensor leads and twist
the stripped ends tightly. Secure
with the proper sized wire nuts.
3.
Tape all wire nut connections to insu-
late connections from each other.
CAUTION The circuit board is fragile, han-
dle with care.
1.
Turn off power to machine.
2. Removefront panel.
3. Remove electrical box left front
cover.
5. Carefully lift any corner of the circuit
board while pinching closed
the top
part of
the plastic "standoff " support
with needle nose pliers. The circuit,
board has to be gradually worked up
over all of the "standoff" supports.
The circuit board
will not "pop off"
until all supports have been pinched
closed and the board
is then holding
them
in that position.
J?ElNSTALLATlON 0 F SOLID ST ATE CON-
TROL
1. Align all holes in the circuit board
over the plastic standoff suppbts.
2.
Carefully push downward at all hole
locations
until board seats on 811 the
standoff supports. (Sometimes a
snap
will be heard as this seating
takes place.)
3. After the circuit board is seated,
carefully connect the three plugs to
the circuit board.
NOTE: Plug connects are polarized. Make'
sure the plug is inserted correctly.
)
d
4. Disconnect the through wire plug
connections from circuit board.
16