Kold-Draft GB337 Service Manual
R
Technical Service and
Replacement Parts Manual
Ice Equipment for 50 Hz. Applications
Models GB457, GB657, GB1257,
GB1258, GT357, and GT557
KDIndustries, Inc.
Erie. PA 16511-1088 U.S.A.
814-453-6761
FAX: 814-455-6336
www.kold-draft.com
LIT 09506 ENG 1-07
1525 East Lake Road
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KOLD-DRAFT®
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SAFETY WARNINGS AND INFORMATION
KNOWLEDGE OF PROPER INSTALLATION AND SERVICE PROCEDURES IS
ESSENTIAL TO THE SAFE OPERATION AND MAINTENANCE OF KOLD-DRAFT
EQUIPMENT. REFER ALL INSTALLATION AND SERVICE WORK TO QUALIFIED
TECHNICIANS.
ALWAYS DISCONNECT THE POWER SUPPLY BEFORE SERVICING THE EQUIPMENT
OR WHEN THE EQUIPMENT WILL NOT BE USED FOR A PERIOD OF TIME. SOME
CIRCUITS REMAIN ENERGIZED WHEN THE ICE MACHINE IS SWITCHED OFF.
NEVER OPERATE EQUIPMENT THAT HAS BEEN DAMAGED OR DOES NOT HAVE ALL
THE PROTECTIVE COVERS IN PLACE.
NEVER OPERATE EQUIPMENT THAT HAS BEEN ALTERED FROM THE ORIGINAL
KOLD-DRAFT SPECIFICATIONS.
SPECIAL ATTENTION SHOULD BE GIVEN TO POTENTIAL HAZARD LABELING ON
THE EQUIPMENT AND THE SIGNAL WORDS AND SYMBOLS THAT ARE USED
THROUGHOUT THIS MANUAL.
WARNING- Warning is used to indicate the presence of a hazard which can
cause personal injury, death or substantial property or equipment damage, if the
statement is ignored.
CAUTION- Caution is used to indicate the presence of a hazard which can
cause minor personal injury or property damage, if the statement is ignored.
ELECTRICAL CAUTION- Used to indicate the presence of an electrical hazard
which can cause personal injury or property damage, if the statement is
ignored.
NOTE-
which is important, but not a cause of personal injury or property damage.
Note is used to notify personnel of installation, operation or maintenance information
KOLD-DRAFT®
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Table of Contents
Section 1 General Information
Equipment Identification
Serial Number Plate Location . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Model Number Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Date Code Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Section 2 Installation Information
Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Assembly and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Section 3 Operational Information
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Controls and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Wiring Diagrams
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
GB457A/W and GB657A/W . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
GB1257A/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
GB1258A/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
GT357A/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27
GT557A/W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
Operational Parameters
Water Fill Levels, Cycle Times and Harvest Weights . . . . . . . . . . . . 3-29
Cube Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
Typical Refrigerant Operating Pressures . . . . . . . . . . . . . . . . . . . 3-29
Refrigerant Charge Information . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
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Table of Contents
Section 4 Service Information
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Problems and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Test Procedures
Actuator Motor Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Liquid Level Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Compressor Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Illustrations
Actuator Motor, Switch and Water Plate Spring Relationship . . . . . . . . . 4-15
Water Plate Alignment . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Web Thickness Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Section 5 Parts
Ice Making Section All GB and GT550 . . . . . . . . . . . . . . . . . . . . 5-2
Water Level Control All GB and GT550 . . . . . . . . . . . . . . . . . . . . 5-3
Water Level Control GT350 . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Ice Making Section GT350 . . . . . . . . . . . . . . . . . . . . . . . . 5-5
GB4(2,3,4,5)7
Chassis Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Control and Electrical Components . . . . . . . . . . . . . . . . . . . . 5-7
Refrigeration Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
GB6(2,3,4,5)7
Chassis Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Control and Electrical Components . . . . . . . . . . . . . . . . . . . . 5-10
Refrigeration Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
GB12(2,4,5)8
Chassis Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Control and Electrical Components . . . . . . . . . . . . . . . . . . . . 5-13
Refrigeration Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
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Table of Contents
GT3(3,4,5)7
Chassis Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Control and Electrical Components . . . . . . . . . . . . . . . . . . . . 5-16
Refrigeration Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
GT557
Chassis Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
Control and Electrical Components . . . . . . . . . . . . . . . . . . . . 5-19
Refrigeration Components . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
KOLD-DRAFT®
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GENERAL INFORMATION EQUIPMENT IDENTIFICATION
WARNING- USE ONLY GENUINE KOLD-DRAFT REPLACEMENT PARTS
USE OF NON-APPROVED PARTS WHEN SERVICING KOLD-DRAFT EQUIPMENT MAY
CREATE A SAFETY HAZARD OR CAUSE EQUIPMENT AND PROPERTY DAMAGE.
USE OF NON-APPROVED PARTS WHEN SERVICING KOLD-DRAFT EQUIPMENT WILL
VOID THE EQUIPMENT WARRANTY.
SERIAL NUMBER PLATE LOCATION
NOTE-
A COMPLETE MODEL NUMBER AND DATE CODE ARE ESSENTIAL FOR THE
ACCURATE SELECTION OF REPLACEMENT PARTS.
SEE THE FOLLOWING FOR THE LOCATION OF THE SERIAL NUMBER PLATE.
>1/05
<1/05
KDINDUSTRIES, INC. ERIE, PA. U.S.A.
GB654WK 000000 5EU
208-230V/60HZ/1PH 22oz. R-404a
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GENERAL INFORMATION EQUIPMENT IDENTIFICATION
Classic Model Number Key
GB 4 5 1 W HK
Cube Size
C = Full Cube
HK = Half Cube
K = Cube-Let
Condenser Type
A = Air cooled condenser-self contained
W = Water cooled condenser-self contained
R = Remote air cooled condenser
Electrical Characteristics
1 = 115 volt-60 hz.-1ph. (2-wire plus ground)
4 = 208/230 volt-60 hz.-1ph. (2-wire plus ground)
5 = 208/230 volt-60 hz.-3ph. (3-wire plus ground)
7 = 220/240 volt-50 hz.-1ph. (2-wire plus ground)
8 = 220V/380V-50 hz.-3ph. (4-wire plus ground)
Modification Code
2 = R-502, Copeland compressor except GB1224/25 Bristol
3 = R-502, Bristol compressor
4 = R-404-a, Bristol inertia compressor/POE lubricant except
GT341/GT344 Bristol reed valve compressor/POE lubricant
5 = R-404a, Tecumseh compressor/POE lubricant
Series
3 = 300 Series
4 = 400 Series
5 = 500 Series
6 = 600 Series
12 = 1200 Series
Cabinet Width
GB = 42” Wide
GT = 28-1/2” Wide GT3XX models, 30” Wide GT55X models
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GENERAL INFORMATION EQUIPMENT IDENTIFICATION
DATE CODE KEY
YEAR KEY
4K = 1990 5K = 2000 6K = 2010 7K = 2020
4A = 1991 5A = 2001 6A = 2011 7A = 2021
4B = 1992 5B = 2002 6B = 2012 7B = 2022
4C = 1993 5C = 2003 6C = 2013 7C = 2023
4D = 1994 5D = 2004 6D = 2014 7D = 2024
4E = 1995 5E = 2005 6E = 2015 7E = 2025
4F = 1996 5F = 2006 6F = 2016 7F = 2026
4G = 1997 5G = 2007 6G = 2017 7G = 2027
4H = 1998 5H = 2008 6H = 2018 7H = 2028
4J = 1999 5J = 2009 6J = 2019 7J = 2029
MONTH KEY
M = JANUARY R = APRIL U = JULY X = OCTOBER
N = FEBRUARY S = MAY V = AUGUST Y = NOVEMBER
P = MARCH T = JUNE W = SEPTEMBER Z = DECEMBER
EXAMPLE
4CN = FEBRUARY, 1993 5ET = JUNE, 2005
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INSTALLATION INFORMATION GENERAL
NOTE!
CHECK FOR FREIGHT DAMAGE BEFORE PROCEEDING WITH THE
EQUIPMENT INSTALLATION. BE SURE TO INSPECT THE EQUIPMENT
CARFULLY FOR ANY DAMAGE THAT MAY NOT HAVE BEEN EVIDENT ON
THE OUTSIDE OF THE CARTON. CONTACT THE FREIGHT CARRIER
IMMEDIATELY TO REPORT ANY DAMAGE AND FILE A CLAIM.
WARNING
DO NOT OPERATE EQUIPMENT THAT HAS BEEN DAMAGED.
REFER ALL MAINTENANCE TO QUALIFIED PERSONNEL.
NEVER OPERATE THE ICE MAKER WITH ANY COVERS, PANELS OR
OTHER PARTS REMOVED OR NOT PROPERLY SECURED.
INSTRUCT ALL PERSONNEL IN THE PROPER USE OF THE EQUIPMENT.
CLEAN UP ANY SPILLAGE IMMEDIATELY.
CAUTION
FAILURE TO COMPLY WITH ALL KOLD-DRAFT INSTALLATION
GUIDELINES MAY CAUSE PERSONAL INJURY, EQUIPMENT OR
PROPERTY DAMAGE AND MAY VOID THE PRODUCT WARRANTY.
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INSTALLATION INFORMATION PLACEMENT
WARNING
ALWAYS INSTALL THE ICE MAKER ON A STABLE AND LEVEL SURFACE.
ALWAYS ATTACH THE ICE MAKER TO THE ICE STORAGE BIN.
ALL MODELS ARE INTENDED FOR INDOOR USE ONLY. DO NOT
INSTALL THE EQUIPMENT IN UNPROTECTED OUTDOOR AREAS.
DO NOT INSTALL THE EQUIPMENT IN WET AREAS.
DO NOT LOCATE THE EQUIPMENT NEAR ANY HEAT SOURCE, IN DIRECT
SUNLIGHT, IN HIGH AMBIENT AREAS, OR WITHOUT PROPER
CLEARANCE FOR VENTILATION. PLACING EQUIPMENT IN THESE
LOCATIONS WILL RESULT IN REDUCED CAPACITIES, HIGH SYSTEM
PRESSURES AND MAY CAUSE EQUIPMENT FAILURE.
AMBIENT OPERATING TEMPERATURES
Minimum 7°C (45°F) Maximum 32°C (90°F)
Ambient temperatures less than 15°C (60°F) may cause erratic bin thermostat operation.
Ambient temperatures higher than the maximum specification will result in reduced capacities
and high system pressures, in air cooled models.
EQUIPMENT CLEARANCE REQUIREMENTS
Clearance must be provided for ventilation and access for service. Ventilation is especially
important for models with air cooled condensers. Failure to provide adequate clearance may
result in reduced capacities and high system pressures. See the installation instructions,
provided with the ice machine, for proper minimum clearance dimensions for a particular
model.
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INSTALLATION INFORMATION PLUMBING
DRAINS
Separate drains must be provided for each ice maker and ice bin. An additional condenser
drain is required for any liquid cooled ice maker, when the condenser coolant will not be recirculated.
The size of the drain tubing must never be reduced along its length.
Make sure that the building drain system can accommodate all the drain water from the ice
machine operation.
Individual drains must never be directly connected to a common manifold, drain or standpipe.
If individual drains are to be discharged into a common manifold, drain or standpipe, a
minimum 38mm (1.5”) air gap must be provided at each connection. This is to prevent any
backflow of drain water into the ice maker or ice bin.
Drain lines must be installed with a minimum drop of 2.5 cm per meter run (.3 inch drop per
foot run).
Ice machine and bin drains may be insulated to prevent condensation.
COOLING TOWER APPLICATION
The ice machine does not need to be modified for use with a cooling tower provided the
cooling tower is properly designed for the application. Information regarding the amount of
heat rejection, as well as the pressure drop through the condenser and liquid valves is
required to properly design a cooling tower application for an ice machine.
Coolant entering the condenser must not exceed 32.2°C (90°F).
Coolant exiting the condenser must not exceed 43.3°C (110°F).
Allow for a pressure drop of 48 kPa (7 psi) between the liquid coolant inlet and outlet of the
condenser.
The condenser liquid control valve will regulate the flow of coolant through the condenser,
thereby controlling the high side pressure in the ice machine.
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INSTALLATION INFORMATION PLUMBING
POTABLE WATER SUPPLY
There are no specific requirements for water treatment provided that the water is potable, not
laden with sediment and does not exhibit a residual chlorine level greater than 0.2 ppm. The
use of water treatment, however, may increase the intervals between cleaning operations.
Do not connect the ice machine to a hot water supply line. Insulate the water line from
sources of heat or to prevent condensation.
NOTE- Purge all water supply lines before connecting them to the ice machine.
CAUTION
HIGH RESIDUAL CHLORINE (MORE THAN 0.2 PPM) CAN CAUSE CORROSION OF ICE
MAKER COMPONENTS AND EVEN THE 300 SERIES STAINLESS STEEL FRAME AND
SKIN PANELS. HIGH CHLORINE LEVELS MUST BE REDUCED, IN THE ICE MAKER
WATER SUPPLY, TO PROTECT THE EQUIPMENT AND PRESERVE THE PRODUCT
WARRANTY.
Please contact your local water conditioning expert for recommendations, about your specific
water supply, or consult the factory.
A minimum 0.2 Mpa (30 psig) dynamic water supply pressure is required for proper operation
of the ice maker water valve. Please note that on liquid cooled ice machines, where the
same water supply is used for both condenser cooling and the potable water supply, the
demand for condenser coolant may cause the supply pressure to drop. This is most notable
at the time of peak load, at the beginning of the freeze cycle.
Minimum water temperature 7°C (45°F) Maximum water temperature 32°C (90°F)
Water temperatures higher than the recommended maximum will cause reduced capacities.
Minimum water pressure 0.2 MPa (30 psig) Maximum water pressure 0.6 MPa (100 psig)
If a water pressure regulator is used, the recommended setting is 0.2 MPa to 0.3 MPa (30 to
50 psig) dynamic.
KOLD-DRAFT®
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INSTALLATION INFORMATION ELECTRICAL
WARNING
ALL KOLD-DRAFT MODELS ARE INTENDED TO BE INSTALLED WITH A
PERMANENT CONNECTION TO THE FIELD ELECTRICAL SUPPLY. DROP
CORD CONNECTIONS SHOULD NEVER BE USED WITH THIS EQUIPMENT.
ALWAYS BE SURE THE POWER SUPPLY IS THE SAME AS THE ICE
MACHINE SPECIFICATION. SEE THE ICE MACHINE ELECRICAL PLATE.
BRANCH CIRCUIT PROTECTION
PROPER PROTECTION MUST BE PROVIDED BY THE USE OF FUSES OR HACR TYPE
CIRCUIT BREAKERS. EACH ICE MAKER MUST BE CONNECTED TO A SEPARATE
PROTECTED CIRCUIT WITH NO OTHER LOADS. A FUSED DISCONNECT, INSTALLED
ADJACENT TO EACH ICE MAKER, IS RECOMMENDED AND MAY BE REQUIRED BY
LOCAL CODES.
Minimum ampacity does not indicate typical running current value. Refer to the equipment
electrical plate. Use the minimum ampacity value for sizing branch circuit conductors up to 8
meters (26 feet) in length. For conductor length over 8 meters, increase the wire gauge as
required.
Normal protector size is based on rated voltage and operation at lower than extreme
temperature limits. Branch circuit conductors may be sized to allow increasing the protector
value up to the specified maximum. This may avoid nuisance protector opening under harsh
operating conditions.
NOMINAL NO-LOAD MAXIMUM FULL-LOAD MINIMUM
220/240 250 210
380 420 360
VOLTAGE TOLERANCE
KOLD-DRAFT®
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INSTALLATION INFORMATION ASSEMBLY AND START-UP
ASSEMBLY
Remove the ice machine top-cover panel, front-cover panel and side-cover panels from the
ice machine frame.
The ice storage bin surface must be level. Use the ice storage bin leg adjusters, if they are
provided. If the bin will be mounted directly to the floor, use shims as required. Seal the bin
to the floor using a sealant with a National Sanitation Foundation certification. If there are
gaps larger than 3 mm install a cove molding around the bottom of the bin.
If not provided, a hole must be installed in the bin top corresponding to the ice drop zone.
Holes are provided in the ice machine frame for the purpose of attaching the ice machine to
the ice storage bin. Use the fasteners provided or other suitable non-corroding fasteners for
this purpose.
Apply gasket material to the ice storage bin top. The gasket material must be positioned at
the outside edge of the ice machine frame.
Carefully lift the ice machine and position it on the ice storage bin. Attach the ice machine to
the ice storage bin.
Make all plumbing and electrical connections to the ice machine and ice storage bin.
Remove all shipping materials from the ice machine including the water plate shipping strap.
Install the bin thermostat capillary tube, into the ice storage bin, according to the instructions
provided with the ice machine.
NOTE- Place the bin thermostat cap tube below any ice deflectors in the storage bin. If
ice piles up, above these deflectors, it may bridge over and not feed down to the lower
section of the bin.
START-UP
Be sure that the ice-off-wash switch is in the “off” (center) position.
Turn on the water supply and the electrical power and check all supply lines for leaks.
Make sure all pump and water tank hoses are connected, then pour .5 liter of clean potable
water into the circulation system to lubricate the pump seal.
KOLD-DRAFT®
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INSTALLATION INFORMATION ASSEMBLY AND START-UP
Move the ice-off-wash switch to the “wash” (right) position and observe the water filling the
water tank and the pump running. Pinch the flexible hose, which connects the water valve to
the water distributor tube, if the distributor tube holes do not produce full streams and it
appears and sounds like air is flowing through the tube. The water fill is complete when the
water level in the probe tube reaches the high-level probe. Observe that the water valve is
de-energized, at this time and there are no water leaks from the hoses or water tank into the
drain pan.
NOTE- For GB1220, 1240, and 1250 models observe that the water fill difference,
between the upper and lower water tanks, is less than 6 mm for “K” models and 3 mm
for “C” and “HK” models.
Pull down on the right side of the water plate, stretching the springs until the water pump
stops and the actuator motor rotates the cam arms counter-clockwise. Allow the cam arms to
rotate far enough so that the pump does not restart when the water plate is released.
Observe that the cam arms continue to turn, opening the water plate fully, dumping the water
in the tank. At this point, the cam arm rotation will reverse and close the water plate. The
cam arm rotation will stop when the water plate is fully closed and the water fill process will
repeat.
Move the ice-off-wash switch to the “ice” (left) position and observe that the compressor and
the fan motor (air cooled only) begin to run. The refrigeration system operation should be
checked and adjusted during the first few cycles. Consult the “OPERATION” section of this
manual for the proper adjustments to the refrigeration system.
Test the bin thermostat operation by holding ice against it. Adjust the thermostat, if required,
to shut off the ice machine within 30 seconds of contact between the ice and the thermostat
capillary tube.
Make sure that the drain pan, ice chute and/or ice deflectors are properly installed. Replace
and secure all the cabinet panels.
Discard all the ice from the start-up cycles, then clean and sanitize the ice storage bin
according to the instructions provided with the bin.
Complete and mail the registration certificate to the factory. Leave all instructions with the
owner/user.
NOTE- Emphasize all cautionary information to prevent personal injury, property
and/or equipment damage.
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KOLD-DRAFT®
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OPERATIONAL INFORMATION COMPONENTS
Note: See the Remote Air-Cooled Condenser section of the manual for additional
components related to these ice machines.
REFRIGERANT COMPRESSOR: Provided to pump refrigerant through the refrigeration
system. See the serial number plate for refrigerant specification and electrical
characteristics.
CONDENSER: All air-cooled and liquid-cooled models are provided with a self-contained
refrigerant condenser to remove heat from the refrigeration system. These condensers are
designated in the model number as (“A”) air-cooled and (“W”) liquid-cooled. Remote aircooled condensers are also available for some models. These are designated as (“R”) in the
model number. (See the remote air-cooled section of the manual for information on these
models.)
CONDENSER FAN AND MOTOR: Provided with all air-cooled (“A”) models to draw air
through the condenser.
CONDENSER COOLANT REGULATOR VALVE: Provided with all water-cooled (“W”)
models to regulate the flow of coolant through the condenser and maintain a specified
refrigerant discharge pressure.
RECEIVER: Provided on liquid-cooled and remote air-cooled condenser models for storage
of liquid refrigerant, as required during the operation of the ice machine.
HEAT EXCHANGER: Provided to sub-cool the refrigerant, ensuring that this refrigerant is
liquid at the inlet of the expansion valve.
FILTER DRIER: Provided as insurance that all moisture and impurities are removed from the
refrigeration system.
THERMOSTATIC EXPANSION VALVE: Maintains the proper flow of refrigerant, through the
system, as the load changes during the ice making cycle.
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OPERATIONAL INFORMATION COMPONENTS
EVAPORATOR: A plated copper evaporator is found in all models. The evaporator provides
the five freezing surfaces for ice cube formation.
There are three different evaporators available for Kold-Draft models, depending on the ice
size desired. These evaporators are designated in the model number as (“C”) full cube,
(“HK”) half cube and (“K”) cube-let.
DEFROST VALVE: Directs compressor discharge gas to the evaporator, causing it to warm
and release the ice cubes during the harvest cycle.
STRAINER-WATER INLET: Protects the water valve from particles in the water supply. This
strainer can be cleaned without disconnecting any tubing. If the need for cleaning is frequent,
an external water filter should be provided.
WATER TANK: Provided as a sump to hold the amount of water required to make one batch
of ice cubes.
WATER SOLENOID VALVE: Opens to allow potable water to enter the ice machine and
closes when the water tank is filled to the correct level.
WATER PLATE: Functions as a water manifold with a flat surface. This surface is positioned
close to the evaporator and acts to form the sixth side of the ice cubes. The water plate
surface has one spray hole for each cell in the evaporator, to provide water to the freezing
surfaces. The water plate surface also has two drain holes under each cell, to allow
unfrozen water to return to the water tank to be re-circulated. The water plate swings down
during the harvest cycle to allow the ice cubes to fall out of the evaporator.
There are two different water plate configurations available for Kold-Draft models, depending
on the ice size desired. One is used for (‘C”) full cube models and the other is used for (“HK”)
half cube and (“K”) cube-let models.
WATER PUMP: Continuously circulates the water from the water tank, through the water
plate during the ice making cycle. The water pump also operates during the wash cycle to
circulate cleaning solution.
ACTUATOR MOTOR: Rotates counter-clockwise, at the beginning of the ice harvest cycle,
to lower the water plate, so the ice can fall out of the evaporator. It then rotates clockwise, at
the end of the harvest cycle, to close the water plate for the next ice making cycle.
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OPERATIONAL INFORMATION COMPONENTS
CAPACITOR-ACTUATOR MOTOR: Installed between the two actuator motor windings, the
function of this capacitor is to determine the direction of the rotation of the actuator motor.
CAM ARMS: These are attached to the actuator motor output shaft and function initially to
separate the water plate from the evaporator and then to support the water plate as it opens
fully.
SPRINGS-WATER PLATE: Function as the connection between the cam arms and the
water plate. They also act as a safety mechanism, stretching if any ice remains on the water
plate surface as it is closing against the evaporator.
Additional Component for GB1250 Series Ice Machines
CHECK VALVE-DEFROST: Installed in the defrost tubing to the master (upper) evaporator
to prevent a flow of refrigerant from the master (upper) expansion valve to the slave (lower)
evaporator. This could occur during the ice making portion of the cycle.
KOLD-DRAFT®
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OPERATIONAL INFORMATION CONTROLS AND ADJUSTMENTS
NOTE- See the Remote Air-Cooled Condenser section of the manual for additional
controls, adjustments and considerations related to these ice machines.
BIN THERMOSTAT: Provides power to the ice-off-wash switch. This thermostat functions to
shut off the ice machine, when the ice bin is full. Contact between the ice and the thermostat
capillary tube will cause the thermostat switch to open.
ADJUSTMENT: While holding ice against the thermostat capillary tube, adjust the
thermostat to shut off the ice machine within one minute. A warmer (CCW) adjustment
will shut off the ice machine sooner. A colder (CW) adjustment will delay shut off.
ICE-OFF-WASH SWITCH: Controls the mode of operation of the ice machine.
The “Ice” position provides power to all control circuits including the contactor. (The
contactor provides power to the compressor and also the condenser fan motor in selfcontained air-cooled ice machines.)
The “Wash” position provides power to all control circuits except the contactor. This position
is useful for cleaning the ice machine and for test procedures where operation of the
compressor is not required or desired.
The “Off” position interrupts power to the control circuits.
Note: See the remote air-cooled condenser section of the manual for additional
considerations for these ice machines.
WARNING
ALL ICE MACHINE CIRCUITS ARE NOT DE-ENERGIZED WHEN THIS SWITCH IS IN THE
“OFF” POSITION. ALWAYS DISCONNECT THE POWER TO THE ICE MACHINE
BEFORE SERVICING.
CONTROL STREAM: This is a small clear box, divided into two sections and located on the
front face of the water plate. Water flowing into the left section of the box is returned to the
water tank and recirculated through the system. Water flowing into the right section of the
box is drained out of the system. The velocity of the stream flowing in the box, during the ice
making cycle, is an indicator of the water pressure inside the water plate. This pressure will
increase as the ice cubes fill out in the evaporator, covering the drain holes provided for each
cell. This pressure increase will cause the stream, normally flowing into the left section of the
box, to flow over the partition and into the right section, draining the system of excess water.
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OPERATIONAL INFORMATION CONTROLS AND ADJUSTMENTS
ADJUSTMENT: The stream of water should be adjusted to fall to the left of the control
stream box partition, during the early portion of the ice making cycle, before the cubes
are full.
LIQUID LEVEL CONTROL: This control mechanism is composed of a clear water level tube,
three stainless steel water level probes and a control board.
The water level tube is mounted in front of the water tank and is connected to it by a hose.
As water fills the tank, the water level is visible in the tube.
The water level probes are positioned in the water level tube. Continuity through the water,
between the common probe and the high level probe, will de-energize the water fill circuit. A
break in continuity between the common probe and the low level probe will initiate the harvest
cycle when the evaporator is cold, or energize the water fill circuit when the evaporator is
warm.
ADJUSTMENT: The common probe should be adjusted all the way down.
The low level probe should be adjusted so the tip is approximately 15 mm from the
bottom of the probe tube.
The high level probe determines how much water is taken into the system at the
beginning of a cycle. It is adjusted as required by the size of the cube (“C”, “HK” or
“K”) and the desired fullness (dimple size) of each cube. Typically all cubes should
have a small dimple at the end of the freeze cycle. Lack of a dimple in the cubes is an
indicator that the water tank level is too high at the start of the cycle.
Note: Making cubes without a dimple will reduce ice machine capacity and may
damage the water plate surface in extreme cases. If the control stream is draining
water for more than 15 seconds, at the end of the ice making cycle, the water level in
the tank is too high. Lower the high level probe slightly until proper operation is
evident.
PUMP AND DEFROST SWITCH: This switch is actuated by the water plate and controls the
operation of the water pump. The pump operates when the water plate is closed and the
switch lever is pushed up. If this switch is not actuated when the water plate closes, because
ice is remaining on the water plate surface, the actuator motor will reverse and reopen the
water plate. This will continue until the surface is clear.
ADJUSTMENT: The switch should be actuated when front cam arm is between the 10
o’clock and 11 o’clock positions. Adjust the actuation point on GT350 series machines
by adjusting the height of the actuation screw on the water plate. All other models
have a tab on the water plate that can be easily adjusted by bending it up or down as
required.
Note: Do not bend the switch lever to make this adjustment.
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OPERATIONAL INFORMATION CONTROLS AND ADJUSTMENTS
ACTUATOR THERMOSTAT: This thermostatic switch senses the temperature of the
evaporator, during the ice making cycle and switches from its warm position to its cold
position at approximately 3.3°C (coldest setting—maximum CW adjustment). No change in
the ice machine operation will be noticed at this time. With this thermostat in its cold position,
the circuitry is set up to start the defrost cycle when the cubes are formed and the system
water level drops below the low level probe. After the ice cubes have fallen out of the
evaporator and the evaporator warms to approximately 10°C, the thermostat returns to its
warm position. This ends the defrost cycle and allows the water plate to close and begin a
new ice making cycle.
ADJUSTMENT: The normal adjustment for this thermostat is fully CW (maximum
cold) position. Adjust the thermostat warmer (CCW) only if the defrost time is
insufficient to drop all the ice from the evaporator, before the water plate begins to
close. The defrost time should be increased no more than is required to insure all the
ice has fallen from the evaporator.
Note: Adjusting the thermostat fully CCW (warm) will lock it in its cold switch contact
position. This will keep the water plate open until the thermostat is adjusted CW.
COLD WATER THERMOSTAT: This thermostatic switch is provided on all models, except
the GT350 series and it senses the temperature of the evaporator. When the evaporator is
cold, it connects the defrost valve to the water fill (blue) circuit. When the evaporator is
warm, it connects the defrost valve to the defrost (red) circuit. The water fill (blue) circuit is
energized from the harvest initiation until the water fill is complete. The defrost (red) circuit is
energized whenever the water plate is not fully closed.
The cold water thermostat also acts to prevent false harvest cycles during the water fill
portion of the cycle. If the incoming water is very cold or filling the system at an abnormally
slow rate, the evaporator could become cold enough to switch the actuator thermostat to its
cold position. If this occurs before the water fill is complete, the ice machine will start a
defrost cycle. The water plate will open, dumping the water in the water tank and closing
again to start a new cycle. The cold water thermostat prevents this by energizing the defrost
valve, providing heat to the evaporator before the actuator thermostat can switch to its cold
position.
ADJUSTMENT: The normal adjustment for this thermostat is fully CW (maximum
cold) position. Adjust the thermostat warmer (CCW) only if ice is remaining on the
surface of the water plate between cycles and not being rinsed off. This condition may
be noticed when the supply water is cold and the water level is adjusted to fully form
the cubes (small or no dimples evident in the ice). Adjusting the water level may
improve this problem.
Note: A degraded water plate surface may also contribute to this problem.
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OPERATIONAL INFORMATION CONTROLS AND ADJUSTMENTS
ACTUATOR TOGGLE SWITCH: This switch acts to limit the travel of the actuator motor in
both directions and sets up the circuitry to run the motor in the proper direction when
energized. This is a two position switch that is operated by the output shaft of the actuator
motor. When the motor shaft rotates clockwise, to raise the water plate, it pushes the switch
lever up to stop the rotation when the front cam arm is in the 12 o’clock position (water plate
fully closed). When the motor rotates counter-clockwise, to lower the water plate, it pushes
the switch lever down to stop the rotation when the cam arm is in the 7 o’clock position (water
plate fully open).
ADJUSTMENT: The switch operator, which is attached to the output shaft of the
actuator motor, can be bent slightly to allow the front cam arm to stop in the proper
positions. Bend this operator only if needed to allow the front cam arm to stop at the
12 o’clock position (water plate closed) and the 7 o’clock position (water plate open).
Note: The front water plate spring must be on the left side of the cam hub when the
water plate is fully closed (cam arm in the 12 o’clock position).
CONTACTOR: Provided with all models to carry the compressor load. On air-cooled
models, the condenser fan motor is also connected to the contactor. The contactor coil is
rated for line voltage and the contacts are rated for definite purpose applications (FLA and
LRA).
HIGH PRESSURE CUTOFF: A manual reset pressure switch is provided, which will open
the circuit to the contactor coil if the discharge pressure should reach 3 mPa (gauge) (435
psig).
ADDITIONAL CONTROLS FOR GB1250 SERIES ICE MACHINES
DELAY TIMER-MASTER ACTUATOR MOTOR: This device is used to delay the master
(upper) actuator motor for two seconds to ensure that the slave (lower) actuator motor will
always run ahead of the master motor. The lower actuator toggle switch must always be
actuated before the upper switch. This is required for reliable water plate synchronization.
RELAY-WATER PLATE SYNCRONIZATION: The purpose of this relay, designated as Relay
#1, is to connect the operation of the slave (lower) actuator motor to the position of the
master (upper) actuator toggle switch. This is required for reliable water plate
synchronization.
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OPERATIONAL INFORMATION SEQUENCE OF OPERATION
THE ELECTRICAL SCHEMATICS ON THE FOLLOWING PAGES DESCRIBE THE
SEQUENCE OF OPERATION OF GB450, GB650 AND GT550 MODELS.
NOTE- The sequence of operation for GT350 models is similar except that these models do
not employ a cold water thermostat. The illustrations below describe this variation.
The sequence of operation for GB1250 models is identical to the GB450, GB650 and GT550
models except additional circuitry is employed to assist in the synchronization of the dual
water plates. This circuitry includes a relay and a delay timer. Also, two additional relays are
used to remove the actuator motor loads from the contacts of the actuator toggle switches.
NOTE- GB1250 models employ two each of the following electrical controls and components:
Condenser Fan Motor (air cooled models only) Water Valve
Water Pump Actuator Motor
Pump and Defrost Switch Actuator Toggle Switch
NOTE- See the Remote Air-Cooled Condenser section of the manual for additional
BK Black BU Blue PK Pink Y Yellow
BK/G Black/Green GY Gray R Red
BK/W Black/White O Orange R/W Red/White
GB450, GB650 AND GT550 GT350 VARIATION
considerations related to the operation of these ice machines.
Wire Color Code for Sequence of Operation Schematics
Energized
De-energized
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OPERATIONAL INFORMATION SEQUENCE OF OPERATION
#1 WATER FILL—EVAPORATOR TEMPERATURE ABOVE 10°C.
Control Status Component Status
Bin Thermostat Warm/Closed
IOF Switch Ice
Contactor Closed Compressor (Condenser Fan) On
Water Plate Closed
Pump and Defrost Switch Up Water Pump On
Cold Water Thermostat Warm Defrost Valve Closed
Actuator Thermostat Warm
Water Level Control Low/Level Rising Water Valve Open
Actuator Toggle Switch Up Actuator Motor Off
Ice None Control Stream Low
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OPERATIONAL INFORMATION SEQUENCE OF OPERATION
#2 WATER FILL WITH COLD WATER THERMOSTAT CYCLE
Control Status Component Status
Bin Thermostat Warm/Closed
IOF Switch Ice
Contactor Closed Compressor (Condenser Fan) On
Water Plate Closed
Pump and Defrost Switch Up Water Pump On
Cold Water Thermostat Cold Defrost Valve Open
Actuator Thermostat Warm
Water Level Control Low/Level Rising Water Valve Open
Actuator Toggle Switch Up Actuator Motor Off
Ice None Control Stream Low
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OPERATIONAL INFORMATION SEQUENCE OF OPERATION
#3
WATER FILL COMPLETE—ICE FORMING—EVAPORATOR TEMPERATURE > 3.3°C.
Control Status Component Status
Bin Thermostat Warm/Closed
IOF Switch Ice
Contactor Closed Compressor (Condenser Fan) On
Water Plate Closed
Pump and Defrost Switch Up Water Pump On
Cold Water Thermostat Cold Defrost Valve Closed
Actuator Thermostat Warm
Water Level Control High/Level Falling Water Valve Closed
Actuator Toggle Switch Up Actuator Motor Off
Ice Forming Control Stream Low
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OPERATIONAL INFORMATION SEQUENCE OF OPERATION
#4 ICE FORMING—EVAPORATOR TEMPERATURE < 3.3°C.
Control Status Component Status
Bin Thermostat Warm/Closed
IOF Switch Ice
Contactor Closed Compressor (Condenser Fan) On
Water Plate Closed
Pump and Defrost Switch Up Water Pump On
Cold Water Thermostat Cold Defrost Valve Closed
Actuator Thermostat Cold
Water Level Control High/Level Falling Water Valve Closed
Actuator Toggle Switch Up Actuator Motor Off
Ice Forming Control Stream Low
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