Taylor Freezemaster 336 User manual

Models 336, 338, 339, 750, (8)751, (8)754, 774 & 794
TAYLOR COMPANY
a Specialty Equipment company
Rockton, Illinois 61072

Table of Contents
Section 1: troductionIn
Safety 1 2
2Refrigerant
3Model 336 Specifications
Model 338 Specifications 4
Model 339 Specifications 5
Model 750 Specifications 6
7Models 751/8751 Specifications
Models 754/8754 Specific tions 8a
Model 774 Specifications 9
Model 794 Specifications
Installation Instructions
10
11
Running Specifications 12
13
Section 2: Controls
14Generation II Control Logic Board
19Service Tips for Generation II Boards
22Control Overview
Pump Operation 23
25
Section 3: Troubleshooting
26General Troubleshooting Guide
29Troubleshooting Pump Style Freezers
30Electrical Trou leshootingb
Section 4: Parts
31
32Warranty Explanation
33Model 336 Exploded View
35Model 336 Panel Identification
37Model 338 Exploded View
39Model 338 Panel Identification
41Model 339 Exploded View
43Model 339 Panel Identification
45Model 750 Exploded View
47Model 750 Panel Identification
49Model 751 Exploded View
51Model 751 Panel Identification
53Model 754 Exploded View

Model 754 Panel Identification 55
Model 774 Exploded View 57
Rail A-Syrup X42541 59
Model 774 Panel Identification 60
Model 794 Exploded View 62
Model 794 Panel Identification 64
Control A - X38324-27A (Model 336) 66
Control A - X42865-27 (Model 338) 67
Control A - X32963-27A (Models 339 & 754) 68
Control A - X52614-27 (Model 750) 70
Control A - X47194-27A (Models 751/8751) 71
Control A - X42603-27A (Model 774) 72
Control A - X48236-27A (Model 794) 73
Control A - X48237-27 (Model 794) 74
Box A-Cap & Relay - X48535-27 75
Box A-Cap & Relay - X51593-27 (Model 338) 76
Box A-Cap & Relay - X52665-27 (Model 339) 77
Box A-Cap & Relay - X50317-27 (Model 751) 78
Box A-Cap & Relay - X50297-27 (Model 754) 79
Box A-Cap & Relay - X50373-27 (Model 774) 80
Blower A X47833-27 81
Switch A-Draw X43417-SER (Model 336) 82
Switch A-Draw X38547 (Models 338, 339, 754, 774, 794) 83
Switch A-Draw X33322-SP (Models 750, 751) 84
Air/Mix Pump-Soft Serve X45316-B 85
Models 336/338/339 Three-Spout Door A 86
Models 750/751 One-Spout Beater Door A 87
Models 754/774/794 Three-Spout Beater Door A 88
Pump A-Syrup 036623 (774) 89
Accessories 90
Parts List 91
Wiring Diagrams 114
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.
© January, 1999 Taylor All
rights reserved.

Safety
We at Taylor Company, 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.
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.
This manual is intended exclusively for Taylor Company
authorized service personnel.
Refrigerant
Taylor Company uses R404A refrigerant in the standard
softserve freezers. This refrigerant is generally considered
non-toxic and non-flammable;
however, any gas under pressure is potentially hazardous.
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.
The Taylor Company 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.
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.
The Taylor Company 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.

Model 336 Specifications
Freezing Cylinder
Two, 2.8 quart (2.7 liter) volume.
Mix Hopper
Two, 8 quart (7.6 liter) capacity.
Beater Motor
Two, 1.0 hp.
Refrigeration Unit
One, approximately 9,500 btu/hr compressor.
Refrigerant R404A.
One independent (SHR) compressor, approximately
400 btu/hr. Refrigerant R134a.
(BTU's may vary based on compressor used.)
Electrical
One dedicated connection.
Maximum Minimum
Electrical
Fuse Size Circuit Ampacity
208-230/60/1 Air 35 29
208-230/60/1 Water 35 26
208-230/60/3 Air 25 21
208-230/60/3 Water 25 18
This unit is manufactured in other electrical characteristics.
Refer to the Distributor Data Book for availability. (For exact
electrical information, always refer to the data label of the
unit.)
Air Cooled
Clearance: 3" (7.6 cm.) around all sides. A deflector has
been added to underside, preventing recirculation of warm
air. This will assure proper air flow across condensers to
obtain optimum performance.
Water Cooled
Water inlet and drain connections under side of base 3/8"
FPT
Dimensions
Width: 20-7/16" (51.9cm.)
Depth: 33-3/16" (84.3cm.)
Height: 60" (152.4 cm.)
Floor Clearance: 7-3/4" (19.7 cm.) mounted on
standard casters.
Approximate Weights
Net: 575 Ibs. (260.8 kgs.) Crated: 628 Ibs. (284.9 kgs.),
39.1 cu.ft. (1.10cu.m.)
Availability and specifications are subject to change
without notice.
This unit is designed and constructed to meet stringent safety
and sanitation requirements for NSF and UL.

Model 338 Specifications
Freezing Cylinder
Two, 2.8 quart (2.7 liter) volume.
Mix Hopper
Two, 20 quart (18.9 liter).
Beater Motor
Two, 1.0 hp.
Refrigeration Unit
One, approximately 9,500 btu/hr compressor. Refrigerant
R404A.
One independent (SHR) compressor, approximately 400
btu/hr. Refrigerant R134a. (BTU's may vary based on
compressor used.)
Electrical
One dedicated connection.
Maximum Minimum
Electrical
Fuse Size Circuit Ampacity
208-230/60/1 Air 35 28
208-230/60/1 Water 35 28
208-230/60/3 Air 25 19
208-230/60/3 Water 25 19
This unit is manufactured in other electrical characteristics.
Refer to the Distributor Data Book for
availability. (For exact electrical information, always refer to
the data label of the unit.)
Air Cooled
Clearance: 6" (15.2 cm.) on both sides. It is recommended to
install a skirt to one side of the unit, and to place the back of
the unit against a wall. This will assure proper air flow across
condensers to obtain optimum performance.
Water Cooled
Water inlet and drain connections under side of base 3/8"
FPT.
Dimensions
Width: 26-7/16" (67.2 cm.)
Depth: 31-3/16" (79.2 cm.)
Height: 38-3/4" (98.4 cm.)
Counter Clearance: 3-1/2" (8.9 cm.) mounted on
standard legs.
Approximate Weights
Net: 465 Ibs. (219.0kgs.) Crated: 542 Ibs. (245.9 kgs.), 29.9
cu. ft. (.84 cu. m.)
Availability and specifications are subject to change
without notice.
This unit is designed and constructed to meet stringent safety
and sanitation requirements for NSF and UL.

Model 339 Specifications
Freezing Cylinder
Two, 2.8 quart (2.7 liter) volume.
Mix Hopper
Two, 20 quart (18.9 liter) capacity.
Beater Motor
Two, 1.0 hp.
Refrigeration Unit
Two, approximately 6,000 btu/hr compressors.
Refrigerant R404A.
One independent (SHR) compressor, approximately
400 btu/hr. Refrigerant R134a.
(BTU's may vary based on compressor used.)
Electrical
Two dedicated connections.
Maximum Minimum Circuit
Fuse Size Ampacity
Electrical
Left Right Left Right
208-230/60/1 Air 25 20 19 14
208-230/60/1 Water 20 20 16 14
208-230/60/3 Air 20 15 16 12
208-230/60/3 Water 20 15 14 12
This unit is manufactured in other electrical
characteristics. Refer to the Distributor Data Book for
availability. (For exact electrical information, always refer
to the data label of the unit.)
Air Cooled
Clearance: 3" (7.6 cm.) around all sides. A deflector has
been added to underside preventing recirculation of
warm air. This will assure proper air flow across
condensers to obtain optimum performance.
Water Cooled
Water inlet and drain connections under side of base 1/2"
FPT.
Dimensions
Width: 26-7/16" (67.2 cm.)
Depth: 33" (83.8 cm.)
Height: 59-7/8" (152.1 cm.)
Floor Clearance: 7-1/2" (19.1 cm.) mounted on
standard casters.
Approximate Weights
Net: 608 Ibs. (275.8 kgs.) Crated: 698 Ibs. (316.6 kgs.),
48.1 cu. ft. (1.3 cu. m.)
Availability and specifications are subject to change
without notice.
This unit is designed and constructed to meet stringent
safety and sanitation requirements for NSF and UL

Model 750 Specifications
Freezing Cylinder
One, 3.4 quart (3.2 liter) volume.
Mix Hopper
One, 20 quart (18.9 liter) capacity.
Beater Motor
One, 1.5hp.
Refrigeration Unit
One, approximately 4,900 btu/hr compressor. Refrigerant
R404A.
One independent (SHR) compressor, approximately 400
btu/hr. Refrigerant R134a. (BTU's may vary based on
compressor used.)
Electrical
One dedicated connection.
Maximum Minimum
Electrical
Fuse Size Circuit Ampacity
208-230/60/1 Air 20 18
208-230/60/1 Water 20 18
208-230/60/3 Air 15 12
208-230/60/3 Water 15 12
This unit is manufactured in other electrical
characteristics. Refer to the Distributor Data Book for
availability. (For exact electrical information, always refer
to the data label of the unit.)
Air Cooled
Clearance: 6" (15.2 cm.) on both sides. It is
recommended to place the back of the unit against a
wall. This will assure proper air flow across condensers
to obtain optimum performance.
Water Cooled
Water inlet and drain connections 3/8" FPT.
Dimensions
Width: 18-7/16" (46.8cm.)
Depth: 31-3/16" (79.2cm.)
Height: 37-7/8" (96.2 cm.)
Counter Clearance: 4-1/2" (10.8 cm.) mounted on
standard legs.
Approximate Weights
Net: 360 Ibs. (163.3 kgs.) Crated: 410 Ibs. (186.0 kgs.),
29.1 cu. ft. (.81 cu. m.)
Availability and specifications are subject to change
without notice.
This unit is designed and constructed to meet stringent
safety and sanitation requirements for NSF and UL.

Models 751/8751 Specifications
Freezing Cylinder
One, 3.4 quart (3.2 liter) volume.
Mix Hopper
One, 20 quart (18.9 liter) capacity.
Beater Motor
One,1.5 hp.
Refrigeration Unit
One, approximately 9,500 btu/hr compressor.
Refrigerant R404A.
One independent (SHR) compressor, approximately
400 btu/hr. Refrigerant R134a.
(BTU's may vary based on compressor used.)
Electrical
Electrical One dedicated connection.
Maximum Minimum
Model 751 Fuse Size Circuit Ampacity
208-230/60/1 Air 35 26
208-230/60/1 Water 30 24
208-230/60/3 Air 25 19
208-230/60/3 Water 20 17
Model 8751
208-230/60/1 Air 35 28
208-230/60/1 Water 35 25
208-230/60/3 Air 25 21
208-230/60/3 Water 25 18
These units are manufactured in other electrical
characteristics. Refer to the Distributor Data Book for
availability. (For exact electrical information, always refer to
the data label of the unit.)
Air Cooled
Clearance: 3" (7.6 cm.) around all sides. A deflector has
been added to underside preventing recirculation of warm air.
This will assure proper air flow across condensers to obtain
optimum performance.
Water Cooled
Water inlet and drain connections 3/8" FPT.
Dimensions
Width: 18-7/16" (46.8cm.)
Depth: 31-3/16" (79.2 cm.)
Height: 59-7/8" (152.1 cm.)
Floor Clearance: 7-1/2" (19.1 cm.) mounted on
standard casters.
Approximate Weights
Model 751:
Net: 455 Ibs. (201.9 kgs.) Crated: 476 Ibs. (215.9 kgs.),
35.4 cu. ft. (.99 cu. m.)
Model 8751:
Net: 480 Ibs. (217.7 kgs.) Crated: 501 Ibs. (227.2 kgs.),
35.4 cu. ft. (.99 cu. m.)
Availability and specifications are subject to change
without notice.
These units are designed and constructed to meet stringent
safety and sanitation requirements for NSF and UL.

Models 754/8754 Specifications
Freezing Cylinder
Two, 3.4 quart (3.2 liter) volume.
Mix Hopper
Two, 20 quart (18.9 liter) capacity.
Beater Motor
Two, 1.5 hp.
Refrigeration Unit
Two, approximately 9,500 btu/hr compressors.
Refrigerant R404A.
One independent (SHR) compressor, approximately
400 btu/hr. Refrigerant R134a.
(BTU's may vary based on compressor used.)
Electrical
Two dedicated connections.
Maximum Minimum Circuit
Electrical
Fuse Size Ampacity
Model 754 Left Right Left Right
208-230/60/1 Air 35 30 26 22
208-230/60/1 Water 30 30 24 22
208-230/60/3 Air 25 20 19 15
208-230/60/3 Water 20 20 17 15
Model 8754
208-230/60/1 Air 35 30 28 24
208-230/60/1 Water 35 30 25 24
208-230/60/3 Air 25 20 21 17
208-230/60/3 Water 25 20 18 17
These units are manufactured in other electrical
characteristics. Refer to the Distributor Data Book for
availability. (For exact electrical information, always refer to
the data label of the unit.)
Air Cooled
Clearance: 3" (7.6 cm.) around all sides. A deflector has
been added to underside preventing recirculation of warm air.
This will assure proper air flow across condensers to obtain
optimum performance.
Water Cooled
Water inlet and drain connections under side of base 1/2"
FPT.
Dimensions
Width: 26-7/16" (67.2 cm.)
Depth: 33" (83.8 cm.)
Height: 59-7/8" (152.1 cm.)
Floor Clearance: 7-1/2" (19.1 cm.) mounted on
standard casters.
Approximate Weights
Model 754:
Net: 680 Ibs. (308.4 kgs.) Crated: 707 Ibs. (320.7 kgs.),
47.3 cu. ft. (1.34 cu. m.)
Model 8754:
Net: 730 Ibs. (331.1 kgs.) Crated: 768 Ibs. (348.4 kgs.),
47.3 cu. ft. (1.34 cu. m.)
Availability and specifications are subject to change
without notice.
These units are designed and constructed to meet stringent
safety and sanitation requirements for NSF and UL.

Model 774 Specifications
Freezing Cylinder
Two, 3.4 quart (3.2 liter) volume.
Mix Hopper
Two, 20 quart (18.9 liter) capacity.
Beater Motor
Two, 1.5 hp.
Refrigeration Unit
Two, approximately 9,500 btu/hr compressors.
Refrigerant R404A.
One independent (SHR) compressor, approximately
400 btu/hr. Refrigerant R134a.
(BTU's may vary based on compressor used.)
Electrical
Two dedicated connections.
Maximum Minimum Circuit
Fuse Size Ampacity
Electrical
Left Right Left Right
208-230/60/1 Air 35 30 28 22
208-230/60/1 Water 35 30 25 22
208-230/60/3 Air 25 20 21 15
208-230/60/3 Water 25 20 18 15
This unit is manufactured in other electrical characteristics.
Refer to the Distributor Data Book for
availability. (For exact electrical information, always refer to
the data label of the unit.)
Air Cooled
Clearance: 3" (7.6 cm.) around all sides. A deflector has
been added to underside preventing recirculation of warm air.
This will assure proper air flow across condensers to obtain
optimum performance.
Water Cooled
Water inlet and drain connections under side of base 1/2"
FPT.
Dimensions
Width: 26-7/16" (67.2 cm.)
Depth: 36-3/16" (91.9cm.)
Height: 59-7/8" (152.1 cm.)
Floor Clearance: 7-1/2" (19.1 cm.) mounted on
standard casters.
Approximate Weights
Net: 760 Ibs. (344.7 kgs.) Crated: 865 Ibs. (392.4 kgs.),
49.7 cu. ft. (1.3 cu. m.)
Availability and specifications are subject to change
without notice.
This unit is designed and constructed to meet stringent safety
and sanitation requirements for NSF and UL.

Model 794 Specifications
Freezing Cylinder
Two, 3.4 quart (3.2 liter) volume.
Mix Hopper
Two, 14 quart (13.3 liter) capacity.
Beater Motor
Two, 1.5 hp.
Refrigeration Unit
Two, approximately 9,500 btu/hr compressors.
Refrigerant R404A.
One independent (SHR) compressor, approximately
400 btu/hr. Refrigerant R134a.
(BTU's may vary based on compressor used.)
Electrical
Two dedicated connections.
Maximum Minimum Circuit
Fuse Size Ampacity
Electrical
Left Right Left Right
208-230/60/1 Air 35 35 28 23
208-230/60/1 Water 35 35 25 23
208-230/60/3 Air 25 20 20 16
208-230/60/3 Water 25 20 17 16
This unit is manufactured in other electrical characteristics.
Refer to the Distributor Data Book for
availability. (For exact electrical information, always refer to
the data label of the unit.)
Air Cooled
Clearance: 3" (7.6 cm.) around all sides. A deflector has
been added to underside preventing recirculation of warm air.
This will assure proper air flow across condensers to obtain
optimum performance.
Water Cooled
Water inlet and drain connections under side of base 1/2"
FPT.
Dimensions
Width: 20-7/16" (51.9cm.)
Depth: 33-3/16" (84.3 cm.)
Height: 59-1/2" (151.1 cm.)
Floor Clearance: 7-1/2" (19.1 cm.) mounted on
standard casters.
Approximate Weights
Net: 690 Ibs. (312.9kgs.) Crated: 747 Ibs. (338.8 kgs.), 39.1
cu. ft. (1.1 cu. m.)
Availability and specifications are subject to change
without notice.
This unit is designed and constructed to meet stringent safety
and sanitation requirements for NSF and UL.

Installation Instructions
Air Cooled Units
Air cooled units require a minimum of 3" (7.6 cm.) of
clearance around all sides of the freezer (6" [15.2 cm] for
Models 338 and 750). Failure to allow for adequate clearance
can reduce the refrigeration capacity of the freezer and
possibly cause damage to the compressor.
Water Cooled Units
A cold water supply must be provided with a hand shut-off
valve. Refer to the "Specifications" section in this manual to
identify inlet and outlet water connections for the condensers.
(See "Specifications" pages 3 through 10 for proper line
sizes.) If there is more than one unit, larger lines should be
used. (Flexible lines are recommended if local codes permit.)
The water lines must be flushed of foreign substances before
connection. Depending on local water conditions, it may be
advisable to install a water strainer to prevent foreign
substances from clogging the water system. After connecting
the inlet water line, install a flexible drain line to an open trap
drain. An open trap drain is used so that drain water flow can
be observed. Do not install a shut-off valve on the drain line.
Incorrect hook-up will result in continuous water flow through
the lines.
Recommended water pressure supplied to the unit is 35PSI
(241.3kPa).
Electrical Connections
Each freezer requires a dedicated power supply. Check the
data label on the freezer for fuse, circuit ampacity and
electrical specifications. Refer to the wiring diagram, provided
inside the control box, for proper power connections.
This equipment is intended to be installed in accordance with
the National Electric Code (NEC), NFPA 70. The purpose of
this 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.
Compliance therewith and proper maintenance will result in
an installation essentially free from hazard.
CAUTION: THIS EQUIPMENT MUST BE
PROPERLY GROUNDED! FAILURE TO DO SO CAN
RESULT IN SEVERE PERSONAL INJURY FROM
ELECTRICAL SHOCK!
FOLLOW YOUR LOCAL ELECTRICAL CODES!
Beater Rotation
Beater rotation must be clockwise as viewed looking into the
freezing cylinder.
Figure 1.
To correct rotation on a single-phase unit, exchange leads
inside the beater motor. (Follow the diagram printed on the
motor.)
To correct rotation on a three phase unit, exchange leads at
the main terminal block (splice box).
CAUTION: Make sure the power switch is in the
OFF position before correcting the beater rotation.
Failure to do so may result in electrocution or
component damage.
Electrical connections are made directly to the terminal block
provided in the control box.

Running Specifications
Pressures/Temperatures
The following are the Taylor Company recommended
settings for various components within these models. All
freezers in this manual use Refrigerant HP62 (R404A).
Expansion Valve Soft
Serve
Air Cooled - 21 psi. (145 kPa)
Water Cooled - 20 to 22 psi. (138 to 152 kPa) for a
normal product of 16° to 18°F. (-8.8°to -7.7° C.).
Expansion Valve Adjustment
Place your gauge on the access valve on the suction line
(located at the compressor).
Adjust the pressure higher or lower by turning the
adjustment screw. Clockwise turns will raise the pressure
and counterclockwise turns will lower the pressure.
Note: Make expansion valve adjustments with mix in the
cylinder and the freezer in the AUTO mode. Be sure to
allow adequate time for the pressure to stabilize.
Important: On the Models 336 and 338, expansion
valves on each side of the unit must be set separately.
Pressures must be set at 4 PSI (28 kPa) lower than what
is indicated on the tag.
Low Side (Suction)
Suction pressure equals the expansion valve
setting.
High Side (Discharge)
High side pressure varies for air cooled units, depending
on the ambient temperature.
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.
(1,758kPa).
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 cylinder and
the freezer in the AUTO mode. Be sure to allow
adequate time for pressure to stabilize.

Generation II Control Logic Board
The Generation II logic board's primary function is to interpret
modes of operation. The board monitors mix levels and
temperatures by sending commands to the control's power
board. Commands are sent via a ribbon cable, enabling the
proper relays on the power board to open or close. (See
illustration on page 22.)
Function:
Interpret a mode of operation/monitor mix level and
temperature/monitor product viscosity or product temperature
and send a command to the power board through a ribbon
cable enabling the proper relays on the power board to be
open or closed.
Logic Board (Part Numbers):
As of July, 1996 we have modified the differential on
Generation II controls from 13'F/7.2'Cto4.5'F/2.5-C in order
to meet the new NSF mix temperature requirements. The
new control has a shunt (jumper) to select proper
temperatures. This shunt is located beneath the dip
switches on the left side of the control. The shunt is set in
the upper position for 4.5*F/2.5'C differential for use on mix
hopper systems and in the lower position for 13' F/7.2-C
differential for use on mix cabinet systems. The new control
is compatible with older units. This change will require new
part numbers as follows:
Old Part No. New Part No.
X36641-SERGen. II X36641SER1
X38523-SER Gen. ll-W/Chime X38523SER1
X41072-SER Gen. II-W/EVC X41072SER1
X42002-SER Gen. ll-Hopper Pump X42002SER1
Power Board (Part Numbers):
X32326-SER - Soft Serve
X34983-SER - Shake
Thermistor Probes:
There are three types of thermistor probes used on softech
freezers. The resistance value of the thermistor probes
corresponds with the temperature. As the temperature
becomes warmer, the probe resistance decreases.
X31602 -Barrel Probe (Senses product in
freezing cylinder.)
X34466 -Hopper Probe (Senses temperature
of mix in hopper.)
X50717 -Hopper (Senses temperature of mix in
hopper with new Generation II.)
X36267 -Cabinet Probe (Senses mix cabinet
air temperature.)
Approximate probe resistance readings:
10,000 OHMS at room temperature (77°F/25°C).
30,035 OHMS at hopper/cabinet temperature
(35°F/2°C).
38,830 OHMS at shake temperature (26°F/-3.3°C).
48,636 OHMS at soft service temperature (18°F/-7.7°C).
The part number for the Generation I logic board is
X32325-SER.

Viscosity Function:
In soft serve freezers the logic board monitors amp draw on
the beater motor, which is directly related to the viscosity of
the product in the freezing cylinder. When the amp draw
reaches its set point, the unit cycles off. Therefore, the
viscosity of the product will always be consistent even
through its temperature may vary slightly.
To monitor amperage, L1 power supplied to the beater motor
must pass through the power board beater terminals. The
same softech controls are used in both single and three
phase applications. For this reason the control must be set to
operate in an amperage range which relates to the beater
motor amperage and the desired product viscosity setting.
The selected amperage range simply determines the
adjustment span of the viscosity adjustment potentiometer on
the logic board. The jumper on the power board determines
the amperage range selection. The jumper is placed on the
pin which corresponds to the beater motor amperage when
the desired product viscosity is attained. See page 22 to
locate the range selection jumper.
Viscosity Control Range Selections:
2.4 PIN- 1.2 AMP to 2.4 AMP
5.0 PIN - 2.5 AMP to 5.0 AMP
8.0 PIN - 4.0 AMP to 8.0 AMP
11.2PIN - 5.7 AMP to 11.2 AMP
Setting Viscosity Adjustment:
1. Place an amp probe on one of the L1 leads on the
beater terminal on the power board.
2. Turn the viscosity adjustment screw to the "MAX"
position.
3. With the freezer properly primed, actuate the
refrigeration cycle (press "AUTO").
4. During the freezing process, draw a sample and
inspect the product appearance. When desired
product viscosity and appearance is achieved, note
the beater motor amperage.
5. Cancel the refrigeration cycle (press "AUTO").
6. Using the chart, set what range the beater motor
amperage falls into and place the jumper on the proper
pin. (Note: See chart above for amperage range.)
7. Press "AUTO". When amperage achieves the previously
noted beater motor amperage, turn the viscosity
adjustment screw counterclockwise slowly until the unit
cycles off.
8. Draw several samples to verify that the amperage
at cycle off and product quality remains consistent.
Mix Adjustment:
The mix setting is the temperature adjustment for the mix
cabinet or the mix hopper.
Ideal mix temperature = 38°F (3.3°C) to 40°F (4.4°C).
Cut-out temperature will always be 13°F (7.2°C)
(cabinet)/4.5° F (2.5°C) (hopper) lower than the cut-in
temperature. (See SB 2474.)
The range for cut-in temperature is "MIN" approximately
52'F (11.0'C) and "MAX" approximately 36*F (2.2'C).
Setting the Mix Cabinet Temperature:
1. Place a thermometer in the cabinet close to the
thermistor probe.
2. Turn the mix adjustment screw all the way to "MAX".
3. When the air temperature in the cabinet reaches 30° F
to 31 °F (-1.1 °C), turn the mix adjustment screw
counterclockwise until the mix refrigeration cycles off.
4. Allow the mix temperature to stabilize and adjust
the setting if necessary.

Setting the Mix Hopper Temperature
1. To set the mix hopper temperature, fill the
hopper at least half full with approximately 40° F (4.4°C)
mix.
2. Install a suction pressure gauge at the EPR valve
(evaporator pressure regulator) and verify the correct
operating pressure. Adjust if necessary.
3. Set the "MIX" potentiometer to mid-range.
4. Allow the mix hopper refrigeration system to cycle until
the mix temperature is stabilized. Adjust the setting if
necessary.
Note: On the Models 336, 338, 339, 754 and 794, the
temperature adjustment must be made on the left logic
board.
Standby Adjustment
Maintains mix temperature in the freezing cylinder during
long "no sale" periods to prevent over-beating of the product.
Ideal standby temperature = 30°F (1.1 °C) to 35°F (1.7°C).
Cut-out temperature will always be 4°F (2°C) lower than the
cut-in temperature.
The range for cut-in temperature is "MIN" approximately 44'F
(6.6'C) and "MAX" approximately 30-F (-1,1'C).
Setting Standby Temperatures
1. With the unit properly primed with fresh mix, turn the
STANDBY adjustment screw to the warmest position.
2. Press "STANDBY".
3. When the main refrigeration system cycles off, draw a
sample portion and check the product temperature.
4. To get the desired standby temperature, make a slight
clockwise adjustment and wait until the main
refrigeration cycles off.
Note: On pump units, "STANDBY" must be cancelled and
"PUMP" must be pressed to replace the portion which was
used for the sample draw.

Thermistor Curve
When checking a thermistor probe, first determine the
present temperature at the probe and find it on this chart
along with the approximate correct ohmmeter reading. The
ohmmeter reading may vary from the
correct one. Determine whether the difference is acceptable.
If a probe is actually faulty, the difference will be great.
F.° C.° K OHM
-10 -23.3 118.201
-9 -22.7 114.394
-8 -22.2 110.709
-7 -21.6 107.143
-6 -21.1 103.692
-5 -20.5 100.352
-4 -20.0 97.120
-3 -19.4 94.085
-2 -18.8 91.144
-1 -18.3 88.296
0-17.7 85.536
1-17.2 82.863
2-16.6 80.273
3-16.1 77.765
4-15.5 75.334
5-15.0 72.980
6-14.4 70.627
7-13.8 68.350
8-13.3 66.147
9-12.7 64.014
10 -12.2 61.951
11 -11.6 59.953
12 -11.1 58.021
13 -10.5 56.150
14 -10.0 54.340
15 -9.4 52.854
16 -8.8 51.409
17 -8.3 50.003
18 -7.7 48.636
19 -7.2 47.306
20 -6.6 46.012
21 -6.1 44.754
22 -5.5 43.530
F.° C.° K OHM
23 -5.0 42.340
24 -4.4 41.136
25 -3.8 39.967
26 -3.3 38.830
27 -2.7 37.727
28 -2.2 36.654
29 -1.6 35.612
30 -1.1 34.599
31 -0.5 33.616
32 032.660
33 0.5 31.760
34 1.1 30.885
35 1.6 30.035
36 2.2 29.207
37 2.7 28.403
38 3.3 27.620
39 3.8 26.859
40 4.4 26.120
41 5.0 25.400
42 5.5 24.721
43 6.1 24.059
44 6.6 23.416
45 7.2 22.789
46 7.7 22.180
47 8.3 21.586
48 8.8 21.009
49 9.4 20.447
50 10.0 19.900
51 10.5 19.884
52 11.1 18.881
53 11.6 18.392
54 12.2 17.915
55 12.7 17.451

F.° C.° K OHM
56 13.3 16.998
57 13.8 16.557
58 14.4 16.128
59 15.0 15.710
60 15.5 15.315
61 16.1 14.929
62 16.6 14.554
63 17.2 14.187
64 17.7 13.830
65 18.3 13.482
66 18.8 13.143
67 19.4 12.812
68 20.0 12.490
69 20.5 12.185
70 21.1 11.888
71 21.6 11.598
72 22.2 11.315
73 22.7 11.039
74 23.3 10.769
75 23.8 10.507
76 24.4 10.250
77 25.0 10.000
78 25.5 9.763
79 26.1 9.532
80 26.6 9.306
81 27.2 9.085
82 27.7 8.870
83 28.3 8.659
84 28.8 8.454
85 29.4 8.254
86 30.0 8.058
87 30.5 7.872
88 31.1 7.691
89 31.6 7.513
90 32.2 7.340
91 32.7 7.171
92 33.3 7.006
93 33.8 6.884
94 34.4 6.686
F.° C.° K OHM
95 35.6 6.532
96 35.5 6.386
97 36.1 6.242
98 36.6 6.102
99 37.2 5.966
100 37.7 5.832
103 39.4 5.448
106 41.1 5.096
109 42.8 4.769
112 44.4 4.466
115 46.1 4.184
118 47.8 3.922
121 19.4 3.680
124 51.1 3.454
127 52.8 3.244
130 54.4 3.048
133 56.1 2.866
136 57.8 2.696
139 59.4 2.539
142 61.1 2.391
145 62.8 2.252
148 64.4 2.124
151 66.1 2.004
154 67.8 1.891
157 69.4 1.785
160 71.1 1.687
163 72.8 1.594
166 74.4 1.508
169 76.1 1.427
172 77.8 1.351
175 79.4 1.279
178 81.1 1.212
181 82.8 1.149
184 84,4 1.090
187 86.1 1.034
190 87.8 .982
193 89.4 .932
196 91.1 .886
199 92.8 .842

Service Tips for Generation II Boards
Initial Service Tips
1. Check all connections.
2. Check the cable to verify that it is secure.
3. Verify that all pins are securely fastened in their sockets.
4. Verify that all cables correctly face away from the
boards. If the cable is attached incorrectly, damage to
the logic board will occur. Air/mix pump and beater
motor operation will be disabled.
5. Verify probe resistance.
6. Use the self-test program.
Self-Test Program
The Generation II controls are programmed for a self-test.
The control can be used to help identify problems in the
power board, the logic board, and the thermistor probes. The
self-test program is not intended to, and will not take the
place of a reasonable, and prudent service technician.
The self-test program is divided into two sections. The first
section is an automatic function of the micro processor and
the second section is performed by the technician.
The self-test program is initiated by holding down the MIX,
WASH, AND PUMP keypads on the logic panel while
simultaneously turning on the power switch. Hold down the
keypads until all eight lights illuminate. If all eight lights do
not illuminate, the control is defective. If the self-test cannot
be initiated, the control is defective.
Figure 2.
Each light corresponds with a particular relay. The light on
the panel will not extinguish until the test is completed for
that particular relay.
Logic Panel Light Corresponding Relay
MIX LOW Mix Relay
MIX OUT Fan Relay
MIX Pump Relay
STANDBY Beater Motor Relay
WASH Compressor Relay
AUTO Spinner Relay
PUMP Portion Relay
In each of the tests the relay on the power board will close
and the component will operate for three seconds. There is a
ten second delay between each check.
When the self-test is initiated, all eight lights will remain on
for three seconds. At this time, the processor will begin to
check the power board relays as follows:
1. The SET POINT light turns off.
2. Ten seconds after the SET POINT light turns off, the mix
relay closes for three seconds.
3. The mix relay opens and the MIX LOW light turns off.
4. Ten seconds later, the fan relay closes.
5. Three seconds later, the fan relay opens and the MIX
OUT light turns off.