Taylor 430 Torque User manual

SERVICE
MANUAL
Model 430
Shake/Slush Freezer
Original Service Instructions
051430−S 2/98 (Original Publication)
(Updated 10/5/15)

Table of Contents Model 430
Table of Contents
Section 1: Introduction 1...............................................
Safety 2.............................................................
Model 430 Specifications 4.............................................
Running Specifications 6...............................................
General Installation Instructions 7.......................................
Environmental Notices 10...............................................
Section 2: Systems and Controls 11......................................
Refrigeration System 12................................................
Torque Control 13......................................................
Thermistor Control 15..................................................
Thermistor Curve 17...................................................
Mix Level Control (Thermistor Units) 18...................................
Mix Level Control Diagram (Thermistor Units) 19...........................
Section 3: Troubleshooting 21...........................................
General Troubleshooting Guide 22.......................................
Electrical Troubleshooting Guide 25......................................
Troubleshooting Torque Components 26..................................
Troubleshooting Thermistor Components 27..............................
Section 4: Parts 29......................................................
Parts Warranty Explanation 30...........................................
Operator Parts Identification 31..........................................

Model 430 Table of Contents
Table of Contents −Page 2
Model 430 Exploded View 32............................................
Door Assembly 34.....................................................
Control Box Exploded View (X50663−12) 35...............................
Draw Switch Assembly 36...............................................
Torque Switch Assembly 37.............................................
Accessories 38........................................................
Parts List 39...........................................................
Wiring Diagrams 51....................................................
CAUTION: Information in this manual is intended to be used by Taylor Authorized Service
Technicians only.
Note: Continuing research results in steady improvements; therefore, information in this
manual is subject to change without notice.
Note: Only instructions originating from the factory or its authorized translation
representative(s) are considered to be the original set of instructions.
E1998 Carrier Commercial Refrigeration, Inc.
(Updated October, 2015)
051430−S
Any unauthorized reproduction, disclosure, or distribution of copies by any person of any portion of this work may be
a violation of Copyright Law of the United States of America and other countries, could result in the awarding of Statutory
Damages of up to $250,000 (17 USC 504) for infringement, and may result in further civil and criminal penalties.
All rights reserved.
Taylor Company
a division of Carrier Commercial Refrigeration, Inc.
750 N. Blackhawk Blvd.
Rockton, IL 61072

1
Model 430 Introduction
Section 1: Introduction
SSafety
SModel 430 Specifications
SRunning Specifications
SGeneral Installation Instructions
SEnvironmental Notices

2
Introduction Model 430
081202
Safety
_________________________________
We at Taylor are committed to manufacturing safe
operating and serviceable equipment. The many
built−in safety features that are part of all Taylor
equipment are aimed at protecting operators and
trained service technicians alike.
This manual is intended exclusively for
Taylor authorized service personnel.
DO NOT attempt to run the equipment unless
you have been properly trained to do so.
CAUTION: THIS EQUIPMENT MUST BE
PROPERLY GROUNDED! Do not operate this freezer
unless it is properly grounded and all service panels
and access doors are restrained with screws. Failure
to do so can result in severe personal injury from
electrical shock!
SDO NOT attempt any repairs unless the
main power supply to the freezer has been
disconnected.
SDO NOT operate the freezer with larger
fuses than specified on the data label.
SStationary appliances which are not
equipped with a power cord and a plug or
other device to disconnect the appliance
from the power source must have an all−
pole disconnecting device with a contact gap
of at least 3 mm installed in the external in-
stallation.
SAppliances that are permanently connected
to fixed wiring and for which leakage cur-
rents may exceed 10 mA, particularly when
disconnected or not used for long periods,
or during initial installation, shall have pro-
tective devices such as a GFI, to protect
against the leakage of current, installed by
the authorized personnel to the local codes.
SSupply cords used with this unit shall be oil−
resistant, sheathed flexible cable not lighter
than ordinary polychloroprene or other equi-
valent synthetic elastomer−sheathed cord
(Code designation 60245 IEC 57) installed
with the proper cord anchorage to relieve
conductors from strain, including twisting, at
the terminals and protect the insulation of
the conductors from abrasion.
Failure to follow these instructions may result in
electrocution or damage to the machine.
Note: This unit is provided with an equipotential
grounding lug that is to be properly attached to either
the rear of the frame or the under side of the base pan
near the entry hole for incoming power, by the
authorized installer. The installation location is marked
by the equipotential bonding symbol (5021 of IEC
60417-1) on both the removable panel and the
equipment’s frame, as well as on the diagram.
DO NOT remove the freezer door or any
internal operating parts (examples: beater, scraper
blades, etc.) unless all control switches are in the OFF
position. Failure to follow these instructions may result
in severe personal injury from hazardous moving
parts.
THIS UNIT HAS MANY SHARP EDGES
THAT CAN CAUSE SEVERE INJURIES.
Examples:
Sscraper blades
Scondenser fins
This unit must be installed on a level surface
to avoid the hazard of tipping. Extreme care should be
taken in moving this equipment for any reason.
Two or more people are required to safely move this
unit. Failure to comply may result in personal injury or
equipment damage.

3
Model 430 Introduction
081202
This unit must NOT be installed in an area
where a water jet or hose can be used. NEVER use a
water jet or hose to rinse or clean this unit. Using a
water jet or hose on or around this equipment may
result in electrocution to the user or damage to the
equipment.
Cleaning and sanitizing schedules are
governed by your state or local regulatory agencies
and must be followed accordingly. Please refer to the
cleaning section of the Operator Manual for the proper
procedure to clean this unit.

4
Introduction Model 430
150210
Model 430 Specifications
Freezing Cylinder
One, 4 quart (3.8 liter) capacity.
Mix Hopper
One, 14 quart (13.2 liter) capacity.
Refrigerated and insulated.
Beater Motor
One, .25 hp. motor.
Refrigeration Unit
One, approximately 4,000 btu/hr compressor.
Refrigerant 404A.
Electrical
Standard is 115/60/1. This equipment is supplied with
a 3-wire cord and grounding type plug, for connection
to a single phase, 60 cycle, branch circuit supply. This
unit must be plugged into a properly grounded
receptacle. The cord and plug provided are 20 amp. for
115/60/1, or 15 amp. 208-230/60/1. Therefore, the wall
outlet must also be 20 amp. for 115/60/1 or 15 amp. for
208-230/60/1. For exact electrical information, always
refer to the data label of the unit.
Air Cooled
Clearance: 3” (76.2 mm) around all sides.
Water Cooled
The water inlet and drain connections are located in
the rear panel (3/8” FTP / 9.5 mm).
Dimensions
Width: 16-7/16” (418 mm).
Depth: 28-3/4” (730 mm).
Height: 27-1/2” (699 mm).
Floor Clearance: Designed to rest on a plastic pad
directly on a counter top.
Approximate Weights
Net: 176 lbs. (79.8 kgs.).
Crated: 215 lbs. (97.5 kgs), 14.5 cu. ft. (.40 cu. m.).
Specifications are subject to change without notice.
This unit is designed and constructed to meet stringent
safety and sanitation requirements for NSF, UL, and
CSA.

5
Model 430 Introduction
Figure 1

6
Introduction Model 430
150210
Running Specifications
Expansion Valve Setting
404A/HP62: 35 - 36 PSI (241 - 248 kPa.).
Low Side Pressure
Low side pressure = expansion valve setting.
To adjust the low side pressure, place the gauge on the
low side suction port at the compressor. With the
compressor running, turn the adjustment knob of the
automatic expansion valve clockwise to raise low side
pressure and counterclockwise to lower pressure.
High Side Pressure
Air Cooled: The following chart indicates normal
operating head pressures at various ambient
temperatures:
Ambient Temperature Normal Operating
Head Pressures
F. C. PSI
70_21.1_240 - 270
(1,655 - 1,862 kPa.)
80_26.7_270 - 300
(1,862 - 2,069 kPa.)
90_32.2_300 - 340
(2,069 - 2,344 kPa.)
100_37.8_340 - 380
(2,344 - 2,620 kPa.)
Water Valve
On a water−cooled unit, the water valve should be set
to maintain a compressor head pressure of 255 PSI
(1,758 kPa).
Water Valve Adjustment
Place your gauge on the high side access port of the
compressor. Turning the adjustment stem on the water
valve clockwise will lower the pressure.
Note: Make this adjustment with mix in the freezing
cylinder and the unit in the AUTO mode. Be sure to
allow adequate time for the pressure to stabilize.
E.P.R. Valve Setting
The product temperature in the mix hopper is
maintained by the main refrigeration system and can
be adjusted by the E.P.R. valve. The E.P.R. valve is
factory set at 67 - 69 PSI (462 - 476 kPa.) in order to
maintain hopper product temperature below 40_F.
(4_C.).

7
Model 430 Introduction
150210
General Installation Instructions
The following are general installation instructions. For
complete installation details, please see the check out
card.
ALL WIRING AND PLUMBING MUST
CONFORM TO NATIONAL AND LOCAL CODES.
Site Preparation
Review the area the unit is to be installed in before
uncrating the unit. Make sure that all possible hazards
the user or equipment may come into have been
addressed.
Clearance: Air Cooled Units
Air cooled units require a minimum of 3” (76.2 mm) of
clearance around all sides of the freezer. Failure to
allow for adequate clearance can reduce the
refrigeration capacity of the freezer and possibly
cause damage to the compressor.
For Indoor Use Only: This unit is designed to operate
indoors, under normal ambient temperatures of 70_-
75_F (21_- 24_C). The freezer has successfully
performed in high ambient temperatures of
104_(40_C) at reduced capacities.
This unit must NOT be installed in an area
where a water jet or hose can be used. NEVER use a
water jet or hose to rinse or clean this unit. Using a
water jet or hose on or around this equipment may
result in electrocution to the user or damage to the
equipment.
This unit must be installed on a level surface
to avoid the hazard of tipping. Extreme care should be
taken in moving this equipment for any reason.
Two or more people are required to safely move this
unit. Failure to comply may result in personal injury or
equipment damage.
Uncrate the machine. Inspect the unit for damage.
Report any damage to the Taylor factory immediately.
This piece of equipment is made in the USA and has
USA sizes of hardware. All metric conversions are
approximate and vary in size.
Installer Safety
In all areas of the world, equipment should be
installed in accordance with existing local codes.
Please contact your local authorities if you have any
questions.
Care should be taken to ensure that all basic safety
practices are followed during the installation and
servicing activities related to the installation and
service of Taylor equipment.
SOnly authorized Taylor service personnel
should perform installation and repairs on
the equipment.
SAuthorized service personnel should consult
OSHA Standard 29CFRI910.147 or the ap-
plicable code of the local area for the in-
dustry standards on lockout/tagout proced-
ures before beginning any installation or
repairs.
SAuthorized service personnel must ensure
that the proper PPE is available and worn
when required during installation and ser-
vice.
SAuthorized service personnel must remove
all metal jewelry, rings, and watches before
working on electrical equipment.
THIS UNIT HAS MANY SHARP EDGES
THAT CAN CAUSE SEVERE INJURIES.
Examples:
Sscraper blades
Scondenser fins

8
Introduction Model 430
081202
Electrical Connections
In the United States, this equipment is
intended to be installed in accordance with the
National Electrical Code (NEC), ANSI/NFPA 70-1987.
The purpose of the NEC code is the practical
safeguarding of persons and property from hazards
arising from the use of electricity. This code contains
provisions considered necessary for safety.
In all other areas of the world, equipment should be
installed in accordance with the existing local codes.
Please contact your local authorities.
Each unit requires one power supply for each data
label on the unit. Check the data label on the unit for
fuse, circuit ampacity and other electrical
specifications.
Refer to the wiring diagram provided inside of the
electrical box for proper power connections.
FOLLOW YOUR LOCAL ELECTRICAL CODES!
CAUTION: THIS EQUIPMENT MUST BE
PROPERLY GROUNDED! FAILURE TO DO SO
CAN RESULT IN SEVERE PERSONAL INJURY
FROM ELECTRICAL SHOCK!
Note: This unit is provided with an equipotential
grounding lug that is to be properly attached to either
the rear of the frame or the under side of the base pan
near the entry hole for incoming power, by the
authorized installer. The installation location is marked
by the equipotential bonding symbol (5021 of IEC
60417-1) on both the removable panel and the
equipment’s frame, as well as on the diagram.
SDO NOT operate the freezer with larger
fuses than specified on the data label.
SStationary appliances which are not
equipped with a power cord and a plug or
another device to disconnect the appliance
from the power source must have an all-pole
disconnecting device with a contact gap of
at least 3mm installed in the external install-
ation.
SAppliances that are permanently connected
to fixed wiring and for which leakage cur-
rents may exceed 10 mA, particularly when
disconnected or not used for long periods,
or during initial installation, shall have pro-
tective devices such as a GFI, to protect
against the leakage of current, installed by
the authorized personnel to the local codes.
SSupply cords used with this unit shall be
oil-resistant, sheathed flexible cable not
lighter than ordinary polychloroprene or oth-
er equivalent synthetic elastomer-sheathed
cord (Code designation 60245 IEC 57) in-
stalled with the proper cord anchorage to
relieve conductors from strain, including
twisting, at the terminals and protect the in-
sulation of the conductors from abrasion.
Failure to follow these instructions may result in
electrocution or damage to the machine.
Beater Rotation
Beater rotation must be clockwise as viewed
looking into the freezing cylinder.
The following repairs must be performed by an
authorized Taylor Service Technician.
Disconnect all power to the unit. Failure to
follow this instruction may result in electrocution.
To correct rotation on a single-phase unit, change the
leads inside the beater motor by following the diagram
printed on the motor label.

9
Model 430 Introduction
150210
Water Connections
(Water Cooled Units, Only)
An adequate cold water supply must be provided
with a hand shut-off valve. The water inlet and drain
connections are located on the underside of the
base. These connections are 3/8” FTP.
Flexible lines are recommended, if local codes
permit. In Europe, hose sets for connection of
appliances to the water mains must comply to the
International IEC 61770 standard.
The water expansion valve setting should be set at
255 PSIG (1758 kPa).
Depending on local water conditions, it may be
advisable to install a water strainer to prevent
foreign substances from clogging the automatic
water valve. There will be only one water “in” and
one water “out” connection.
DO NOT install a hand shut-off valve on the water
“out” line! Water should always flow in this order:
First, through the automatic water valve; second,
through the condenser; and third, through the outlet
fitting to an open trap drain.
A back flow prevention device is
required on the incoming water connection side.
Please refer to the applicable National, State, and
local codes for determining the proper configuration.
Refrigerant
In consideration of our environment, Taylor proudly
uses only earth friendly HFC refrigerants. The HFC
refrigerant used in this unit is R404A. This refrigerant
is generally considered non-toxic and non-flammable,
with an Ozone Depleting Potential (ODP) of zero (0).
However, any gas under pressure is potentially
hazardous and must be handled with caution.
NEVER fill any refrigerant cylinder completely with
liquid. Filling the cylinder to approximately 80% will
allow for normal expansion.
Refrigerant liquid sprayed onto the skin may
cause serious damage to tissue. Keep eyes and skin
protected. If refrigerant burns should occur, flush
immediately with cold water. If burns are severe, apply
ice packs and contact a physician immediately.
Taylor reminds technicians to be cautious of
government laws regarding refrigerant recovery,
recycling, and reclaiming systems. If you have any
questions regarding these laws, please contact the
factory Service Department.
WARNING: R404A refrigerant used in
conjunction with polyolester oils is extremely moisture
absorbent. When opening a refrigeration system, the
maximum time the system is open must not exceed 15
minutes. Cap all open tubing to prevent humid air or
water from being absorbed by the oil.
Compressor Warranty Disclaimer
The refrigeration compressor(s) on this machine are
warranted for the term indicated on the warranty card
accompanying this machine. However, due to the
Montreal Protocol and the U.S. Clean Air Act
Amendments of 1990, many new refrigerants are
being tested and developed; thus seeking their way
into the service industry. Some of these new
refrigerants are being advertised as drop−in
replacements for numerous applications. It should be
noted that, in the event of ordinary service to this
machine’s refrigeration system, only the refrigerant
specified on the affixed data label should be used. The
unauthorized use of alternate refrigerants will void
your compressor warranty. It will be the owners’
responsibility to make this fact known to any
technicians they employ.
It should be noted, that Taylor does not warrant the
refrigerant used in its equipment. For example, if the
refrigerant is lost during the course of ordinary service
to this machine, Taylor has no obligation to either
supply or provide its replacement either at billable or
unbillable terms. Taylor does have the obligation to
recommend a suitable replacement if the original
refrigerant is banned, obsoleted, or no longer available
during the five year warranty of the compressor.
Taylor will continue to monitor the industry and test
new alternates as they are being developed. Should a
new alternate prove, through our testing, that it would
be accepted as a drop−in replacement, then the above
disclaimer would become null and void. To find out the
current status of an alternate refrigerant as it relates to
your compressor, call the local Taylor Distributor or the
Taylor Factory. Be prepared to provide the
model/serial number of the unit in question.

10
Introduction Model 430
081202
Environmental Notices
_________________________________
In consideration of our environment, Taylor proudly
uses only earth friendly HFC refrigerants. The HFC
refrigerant used in this unit is R404A. This refrigerant
is generally considered non-toxic and non-flammable,
with an Ozone Depleting Potential (ODP) of zero (0).
However, any gas under pressure is potentially
hazardous and must be handled with caution.
If the crossed out wheeled bin symbol is
affixed to this product, it signifies that this product is
compliant with the EU Directive as well as other similar
legislation in effect after August 13, 2005. Therefore,
it must be collected separately after its use is
completed, and cannot be disposed as unsorted
municipal waste.
The user is responsible for returning the product to the
appropriate collection facility, as specified by your local
code.
For additional information regarding applicable local
laws, please contact the municipal facility and/or local
distributor.
NOISE LEVEL: Airborne noise emission does not
exceed 78 dB(A) when measured at a distance of 1.0
meter from the surface of the machine and at a height
of 1.6 meters from the floor.

11
Model 430 Systems and Controls
Section 2: Systems and Controls
SRefrigeration System
STorque Control
SThermistor Control
SThermistor Curve
SMix Level Control
SMix Level Control Diagram
IMPORTANT: The Model 430 was first manufactured with the Thermistor Control and
is now designed with the Torque Control. The information in this manual covers both
designs.

12
Systems and Controls Model 430
080522
Refrigeration System
Figure 2

13
Model 430 Systems and Controls
Torque Control
Operation
When the unit is placed in the “AUTO” mode, the
beater motor is activated. After a three second delay,
the compressor starts. When the torque sensor
indicates that viscosity has been achieved, it trips a
microswitch, and the compressor stops. The beater
motor continues to run for 20 seconds and then stops.
If the torque sensor returns to the unsatisfied position
during the additional 20 seconds of beater operation,
the compressor will run again for an additional 10
seconds (minimum), and will continue until the torque
sensor is satisfied. The beater motor will run for 20
seconds.
If the torque sensor remains in the satisfied position
after a 7 or 12 minute cycle time has elapsed, the
refrigeration system will reactivate for 12 seconds, or
until viscosity is satisfied.
Figure 3

14
Systems and Controls Model 430
Features
Mix Low / Mix Out
The Taylor Model 430 torque control is equipped with
the mix low/mix out function. When the mix supply is
low, the sensor activates the “MIX LOW” light to
indicate a need for mix replenishment.
When a mix out condition is detected, the sensor
activates the “MIX OUT” light. The beater motor and
compressor are disabled at the completion of the draw.
Once the mix supply has been replenished, there is a
30 second delay before the refrigeration system
continues.
Protection Fuse
There is an external fuse located on the control board.
(See illustration on page 13.) Although it appears to be
soldered to the board, it is actually plugged into two
small sockets on the board. The fuse protects the
transformer from damage in the event that the
secondary side of the board becomes shorted. When
the fuse is open (blown), all board functions are
interrupted. The fuse must then be replaced.
Lockout (Optional)
The unit is equipped with an optional lockout mode.
This is a selectable lockout for either 1−day or 4−days.
The lockout mode requires that the unit be taken apart
and cleaned every 1 or 4 days, depending on the
lockout selection. (Taylor recommends, and most local
health code laws demand, daily cleaning.)
If the unit is not taken apart and cleaned within the
allotted time frame, the control will enter the lockout
mode. The beater motor and the compressor are then
disabled.
The 1−day lockout is enabled by placing a jumper on
J2−3&4. The lockout light starts flashing four hours
prior to lockout. The lockout light illuminates
continuously when the unit is locked out.
The 4−day lockout light starts flashing four hours prior
to lockout. The lockout light illuminates continuously
when the unit is locked out.
The lockout mode works by use of a magnet. The
magnet has been placed in the upper right hand corner
of the freezer door. Behind the front panel of the
freezer, there is a reed switch. (Door switch on the wire
diagram.) When the freezer door is in place on the
freezer, the magnet holds the reed switch open,
signaling the control that the door is in place. When the
freezer door is removed, the reed switch closes,
signaling the control that the door is not in place. The
control must sense that the reed switch is closed for at
least five minutes and that the power switch is in the
“OFF” position before the lockout is cleared and the
timer is reset.
Ready Light (Optional)
When the control determines that the product is at a
servable viscosity, the “READY” light on the front panel
illuminates. Servable viscosity is determined in the
following manner.
When the control switch is first placed in the “AUTO”
position, the product must freeze down to the viscosity
set point (until the torque switch is satisfied). Once the
torque switch is satisfied, the “READY” light will
illuminate. During normal draw patterns, the control
monitors how long the draw valve is open to estimate
the amount of product drawn, and the control monitors
how long the compressor has run to estimate the
amount of cooling that has taken place. Within the
software a “Reference Value” has been established to
determine the status of the “READY” light.
Drawing product raises the reference value,
compressor operation lowers it. When the reference
value drops to the pre-determined value, the ready
light illuminates.

15
Model 430 Systems and Controls
Thermistor Control
Function
The thermistor control maintains temperature in the
freezing cylinder by monitoring the resistance of the
thermistor probe.
Specifications
Temperature Differential: cut in = 2_F. (1.1_C.)
above cut-out.
Coarse Adjustment Range: 10_to 30_F. (-12_to
-1_C.).
Fine Adjustment Range: 4_F. (2_C.) total.
Coarse Adjustment Potentiometer: 1/4 turn =
approximately 6_F. (3_C.).
Input Voltage Supply: 24 VAC.
Thermistor Probe (Part # 038061-BLK)
The resistance value of the thermistor probe
corresponds with the product temperature in the
freezing cylinder. As the product becomes colder, the
probe resistance increases. As the product becomes
warmer, the probe resistance decreases.
Approximate probe resistance readings:
1. 10,000 ohms at room temperature:
78_F. (25_C.).
2. 46.012 ohms at serving temperature:
20_F. (-6.6_C.).
Operation
The thermistor probe is positioned in the bulb-well
located at the front of the freezing cylinder. The
thermistor control becomes operational when
powered by the 24 VAC transformer.
When the desired product is achieved (control
set−point) the thermistor control relay opens and
discontinues the power sent to the compressor relay
coil.
When the product in the freezing cylinder reaches 2_F.
(1_C.) above the control set-point, the thermistor relay
closes, sending L1 power to the compressor relay coil.
The refrigeration system will run until the control
set-point is achieved.
Anticipator
The anticipator signals the thermistor control to
activate the refrigeration system whenever product is
drawn. As the draw valve is raised (freezer draw switch
closes), continuity is created between the thermistor
control anticipator terminals. The thermistor control
relay will close within 1 second to start the refrigeration
system.
Upon completing the draw, the thermistor control
recognizes the loss of continuity between the
anticipator terminals, but will continue refrigeration for
at least 25 seconds. This allows for additional blending
and freezing of the warmer mix which has entered the
freezing cylinder. After approximately 25 seconds
have elapsed, the thermistor control returns to normal
operation and cycles off the refrigeration system when
the set-point temperature is achieved.
Cycle Timer
During periods when no product is being dispensed, an
8 minute cycle timer will signal the thermistor control
to activate the refrigeration system. As the timer
cycles, continuity is created between the thermistor
control anticipator terminal. The thermistor control
relay will close within 1 second. The refrigeration
system will then activate.

16
Systems and Controls Model 430
Setting Temperature
1. Position the thermistor fine adjustment at
mid-range. This will limit the fine adjustment
temperature range to ±2_F. (±1_C.).
2. Turn the coarse adjustment clockwise to the
coldest setting.
3. With the freezer correctly primed, place the
power switch in the “AUTO” position.
4. After the appropriate freezing time, test the
product temperature. When a sample portion
temperature is approximately 1_above the
desired temperature setting, slowly turn the
coarse adjustment counterclockwise (warmer)
until the refrigeration system cycles off.
5. Allow the refrigeration system to cycle through
at least two “OFF” cycles. After the unit cycles
off, draw a sample of product and check the
temperature. Readjust the coarse adjustment
as required, but make only small adjustments.
Note: The anticipator automatically activates the
refrigeration system 0 - 1 second after the draw valve
is opened. If several small samples are drawn, the
temperature may drift lower. To accurately set the
control, let the product temperature stabilize by
allowing the thermistor control to cycle the freezer on
and off by the control set point instead of the
anticipator.
Service Tips
If a problem arises with the thermistor control
assembly, identify and replace only the faulty
component. For example, if the probe is defective,
replace only the probe.
A varistor must be connected to the thermistor
control’s 24 VAC terminals in order to protect the
control from voltage spikes (varistor part number
X31547).
Fill the bulb-well with automotive antifreeze before
installing the thermistor probe, and be sure the probe
is installed completely into the bottom of the bulb-well.
Note: Lower the probe to the point where the wires
extend from the probe and a resistance is felt. This
indicates the probe is installed completely in the
bottom of the bulb-well.
If the thermistor relay which starts the compressor will
not close, check the following items:
ELECTRICAL SHOCK AREA! USE CAUTION!
1. Make sure power is being supplied to the
freezer and that all operating switches are in
the correct position.
2. Using a voltmeter, check the voltage supply to
the thermistor control. The control requires 24
volts to operate.
3. Using an ohmmeter, check probe resistance.
(Refer to the thermistor curve chart on page 17
for proper readings.)
If the thermistor relay which deactivates the
compressor will not open, check the following items:
ELECTRICAL SHOCK AREA! USE CAUTION!
1. Make sure the thermistor relay opens when the
freezer control switch is in the “OFF” position.
2. Make sure the thermistor probe is connected to
the correct probe terminals.
3. Using an ohmmeter, check the thermistor probe
for proper resistance. (Refer to the thermistor
curve chart on page 17 for proper readings.)
4. Disconnect one wire to an anticipator terminal.
If the thermistor relay opens after
approximately 25 seconds, the problem is in the
anticipator wiring circuit.
When problems such as erratic product quality occur,
it is of utmost importance to determine if the thermistor
components are defective before replacing them.
For a diagram of the thermistor control, see
page 27 (Troubleshooting Thermistor
Components).