Taylor C152 User manual

SERVICE
MANUAL
Model C152 and C161
Soft Serve Freezer
01/23/2017 (Original Publication)
(Updated 7/29/2020)
Original Service Instructions
085592-S

CAUTION: Information in this manual is intended to be used by Taylor 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.
© 2017 Taylor Company (Original Publication)
085592-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
750 N. Blackhawk Blvd.
Rockton, IL 61072

Table of Contents
085592-S i
Section 1: Introduction/Safety
Safety................................................................................................................. 1-2
Model C152 Specifications................................................................................. 1-4
Model C161 Specifications................................................................................. 1-6
General Installation Instructions......................................................................... 1-8
Running Specifications..................................................................................... 1-14
Section 2: Controls
Generation II Control Logic Board...................................................................... 2-2
Service Tips for Generation II Boards................................................................ 2-7
Control Overview.............................................................................................. 2-10
Refrigeration Schematic................................................................................... 2-11
Valve Functions................................................................................................ 2-12
Section 3: Troubleshooting
General Troubleshooting Guide......................................................................... 3-2
Electrical Troubleshooting.................................................................................. 3-5
Section 4: Parts
Warranty Explanation......................................................................................... 4-2
Model C152 Operator Parts ............................................................................... 4-4
Model C161 Operator Parts ............................................................................... 4-5
Model C152 Service Parts ................................................................................. 4-6
Model C161 Service Parts ................................................................................. 4-9
Beater Door Assembly Model C152................................................................. 4-11
Beater Door Assembly Model C161................................................................. 4-12
Accessories Model C152 .................................................................................4-13
Accessories Model C161 .................................................................................4-14
X86420-12—Control A. 115V 60HZ (Model C152) .......................................... 4-15
X85977-76 Control A. (Model C161)................................................................ 4-16
X86366 Control A.-Channel (Model C152) ...................................................... 4-17
X69423 Control A.-Channel (Model C161) ...................................................... 4-18
X59557-27 Box A.-Cap & Relay (Model C161)................................................ 4-19
Section 5: Parts List
Section 6: Wiring Diagrams

ii 085592-S
Notes:

Section 1:
1-1
Model C152 & C161
Introduction/Safety
Introduction/Safety
• Safety
• Model C152 Specifications
• Model C161 Specifications
• General Installation Instructions
• Environmental Notices
• Running Specifications

1-2
INTRODUCTION/SAFETY
Model C152 & C161 Introduction/Safety
1
Safety
We at Taylor Company are committed to manufacturing
safe operating and serviceable machines. The many
built-in safety features that are part of all Taylor machines
are aimed at protecting operators and trained service
technicians alike.
NOTICE! This manual is intended exclusively
for Taylor service personnel.
Per IEC 60335-1 and its part 2 standards, this machine is
to be used only by trained personnel. It is not intended for
use by children or people with reduced physical, sensory,
or mental capabilities, or lack of experience and
knowledge, unless given supervision or instruction
concerning the use of the appliance by a person
responsible for their safety.
CAUTION! DO NOT attempt to run the machine
unless you have been properly trained to do so. Failure
to do so can result in personal injury or machine damage.
WARNING! This machine must be properly
grounded! DO NOT operate this machine 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!
WARNING! Avoid injury.
•DO NOT attempt any repairs unless the main
power supply to the machine has been
disconnected.
•DO NOT operate the machine with larger fuses
than specified on the data label.
• Stationary machines which are not equipped
with a power cord and plug or other device to
disconnect the machine from the power source
must have an all-pole disconnecting device with
a contact gap of at least 0.125 in. (3 mm)
installed in the external installation.
• Machines that are permanently connected to
fixed wiring and for which leakage currents may
exceed 10 mA, particularly when disconnected,
not used for long periods, or during initial
installation, shall have protective devices to
protect against the leakage of current, such as a
GFI, and be installed by authorized personnel to
the local codes.
• Supply cords used with this machine shall be
oil-resistant, sheathed flexible cable, not lighter
than ordinary polychloroprene or other
equivalent 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.
•For Cord-Connected Machines: Only Taylor
service technicians may install a plug on this
machine.
Failure to follow these instructions may result in
electrocution or damage to the machine.
IMPORTANT! This machine is provided with
an equipotential grounding lug that is to be properly
attached to either the rear of the frame or the underside
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 604171) on both the removable panel and the
machine’s frame, as well as on the diagram.
CAUTION! DO NOT remove the machine 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.
!

INTRODUCTION/SAFETY
1-3
Model C152 & C161
Introduction/Safety
1
WARNING! This machine has many sharp
edges that can cause severe injuries.
Examples:
•Scraper blades
•Condenser fins
•Cup/cone dispenser (if applicable)
CAUTION! This machine must be installed on
a level surface to avoid the hazard of tipping. Extreme
care should be taken in moving this machine for any
reason. Two or more persons are required to safely move
this machine. Failure to comply may result in personal
injury or machine damage.
WARNING! This machine 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
the machine. Failure to follow this instruction may result
in electrocution.
NOTICE! Cleaning and sanitizing schedules
are governed by your federal, state, or local regulatory
agencies and must be followed accordingly. Please see
the cleaning section of this manual for the proper
procedure to clean this machine.
Authorized service personnel must ensure that the
proper personal protective equipment (PPE) is available
and worn when required during installation and service.
!

1-4
INTRODUCTION/SAFETY
Model C152 & C161 Introduction/Safety
1
Model C152 Specifications
Freezing Cylinder
One, 1.5 qt. (1.4 L) volume.
Mix Hopper
One, 8 qt. (7.6 L) capacity.
Beater Motor
One, 0.5 hp.
Refrigeration Machine
One 3,000 BTU/hr compressor. R404A.
Separate Hopper Refrigeration (SHR), one 400 BTU/hr.
R134a.
(Actual BTUs will vary based on application.)
Electrical
Table 1-1
This machine may be manufactured in other electrical
characteristics. Refer to the local Taylor distributor for
availability. (For exact electrical information, always see
the data label of the machine.)
Air-Cooled
Clearance: 4 in. (102 mm) on left and right, and 0 in. 
(0 mm) at the rear. If the machine has legs, install the
skirt provided on the right side of the machine. Minimum
air clearances must be met to ensure adequate air flow
for optimum performance.
Dimensions
Width: 17-3/8 in. (441 mm)
Depth: 29-3/8 in. (746 mm)
Height: 27 in. (686 mm)
Counter Clearance: Designed to rest on a plastic pad
directly on the counter top or optional cart.
Approximate Weights
Note: For reference only, weights may vary depending
on accessories.
Net: 207 lb. (94 kg)
Crated: 238 lb. (108 kg)
Volume: 21.1 cu. ft. (0.60 cu. m)
Availability and specifications are subject to change
without notice.
This machine is designed and constructed to meet
stringent safety and sanitation requirements for NSF 
and UL.
Electrical Total Amps Supplied with
NEMA Cord
115/60/1 Air 16.0 5-20P
208/230/60/1 Air 10.2 6-15P
220-240/50/1 Air 7.8 ---

INTRODUCTION/SAFETY
1-5
Model C152 & C161
Introduction/Safety
1
Model C152 Specifications (Continued)
Figure 1-1 C152 with Cart C20800-W00
27.18
(690.38)
26.5
(673.0)
26.84
(681.74)
3.54
(89.9)
3.86
(98.0)
21.50
(546.1)
32.90
(835.66)
High/Closed
(Shown)
45.61
(1158.5)
8.12
(206.25)
21.12
(536.45)
27.30
(693.42)
43.00
(1092.2)
17.38
(441.45)
53.28
(1353.31)
50.93
(1293.62)
13.30
(337.82)
17.44
(442.98)
28.17
(715.52)
TOP VIEW
OPERATOR SIDE
29.36
(745.75)
5.32
(135.13)
Air Out - Far Side
Air In - Near Side
Low/Open
43.45
(1103.5)
17.48
(444.00)
FIGURES IN BRACKETS INDICATE MILLIMETERS / DECIMAL AND FRACTIONAL DIMENSIONS EQUAL TO ( PLUS OR MINUS 1/16 INCH [1.5mm] ).
DRAWING IS TO BE USED FOR REFERENCE ONLY - DO NOT USE FOR STORE CONSTRUCTION LAYOUT.
30070_A

1-6
INTRODUCTION/SAFETY
Model C152 & C161 Introduction/Safety
1
Model C161 Specifications
Freezing Cylinder
Two, 1.5 qt. (1.4 L) volume.
Mix Hopper
Two, 8 qt. (7.6 L) capacity.
Beater Motor
Two, 0.5 hp.
Refrigeration Machine
One 3,500 BTU/hr compressor. R404A.
Separate Hopper Refrigeration (SHR), one 400 BTU/hr.
R134a.
(Actual BTUs will vary based on application.)
Electrical
Table 1-2
This machine may be manufactured in other electrical
characteristics. Refer to the local Taylor distributor for
availability. (For exact electrical information, always see
the data label of the machine.)
Air-Cooled
Clearance: 6 in. (152 mm) on left and right, and 0 in. 
(0 mm) at the rear. Minimum air clearances must be met
to ensure adequate air flow for optimum performance.
Water-Cooled
Water inlet and drain connections out of rear 3/8 in. 
(9.5 mm) FPT.
Dimensions
Width: 21 in. (533 mm)
Depth: 25-3/4 in. (654 mm)
Height: 29-3/8 in. (746 mm)
Counter Clearance: Designed to rest on a plastic pad
directly on the counter top or optional cart.
Approximate Weights
Note: For reference only, weights may vary depending
on accessories.
Net: 305 lb. (138.3 kg)
Crated: 350 lb. (158.8 kg)
Volume: 22.3 cu. ft. (0.63 cu. m)
Availability and specifications are subject to change 
without notice.
This machine is designed and constructed to meet
stringent safety and sanitation requirements for NSF 
and UL.
Electrical Total Amps Supplied with
NEMA Cord
208/230/60/1 Air 12.0 6-15P
208/230/60/1 Water 12.0 6-15P
220-240/50/1 Air 10.0 ---
220-240/50/1 Water 10.0 ---

INTRODUCTION/SAFETY
1-7
Model C152 & C161
Introduction/Safety
1
Model C161 Specifications (Continued)
Figure 1-2 C161 with Cart C20700-W00
FIGURES IN BRACKETS INDICATE MILLIMETERS / DECIMAL AND FRACTIONAL DIMENSIONS EQUAL TO ( PLUS OR MINUS 1/16 INCH [1.5mm] ).
DRAWING IS TO BE USED FOR REFERENCE ONLY - DO NOT USE FOR STORE CONSTRUCTION LAYOUT.
54.53
[1385.0]
TOP VIEW
OPERATOR SIDE
22.12
[562.0]
20.28
[515.1]
15.90
[404.0]
19.93
[506.2]
52.34
[1329.4]
AIR IN-FAR SIDE
AIR OUT-NEAR SIDE
26.54
[674]
28.95
[735.3]
25.58
[650.0]
3.53
[90.0]
18.50
[470.0]
21.36
[637.2]
8.25
[210.0]
34.14
[867]
47.11
[1197.0]
45.19
[1148.0]
41.2
[1046.48]
20.28
[515.1]
3.77
[96.0]

1-8
INTRODUCTION/SAFETY
Model C152 & C161 Introduction/Safety
1
General Installation Instructions
NOTICE! Only trained, authorized service technicians
should install this machine. Failure to comply will void the
factory warranty.
The following are general installation instructions. For
complete installation details, please see the checkout
card.
IMPORTANT! All wiring and plumbing must
conform to national and local codes.
Site Preparation
Inspect the area where the machine will be installed
before uncrating the machine. Make sure that all possible
hazards to the user and the equipment have been
addressed.
WARNING! Only install this machine in a
location where its use and maintenance is restricted to
trained personnel. Failure to comply may result in
personal injury.
Air-Cooled Machines
Do not obstruct air intake and discharge openings. 
Model C152 requires 4 in. (102 mm) of space on both
sides, and no space at the rear of the machine. Model
C161 requires 6 in. (152 mm) of space on both sides of
the machine, and no space at the rear.
Install the air deflector provided and place the rear of the
machine against the wall to prevent recirculation of warm
air. Minimum air clearances must be met to ensure
adequate air flow for optimum performance. Failure to
allow proper clearance and airflow may cause poor
freezer performance and damage to the machine.
For Indoor Use Only: This machine is designed to
operate indoors under normal ambient temperatures of
70° to 75°F (21° to 24°C). The freezer has successfully
performed in high ambient temperatures of 104°F (40°C)
at reduced capacities.
WARNING! This machine 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
the machine. Failure to follow this instruction may result
in electrocution.
CAUTION! This machine must be installed on
a level surface to avoid the hazard of tipping. Extreme
care should be taken in moving this machine for any
reason. Two or more persons are required to safely move
this machine. Failure to comply may result in personal
injury or machine damage.
Uncrate the machine. Inspect the machine 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
IMPORTANT! In all areas of the world, the
machine 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 machines.
• Only Taylor service personnel should perform
installation and repairs on the machine.
• Authorized service personnel should consult
OSHA Standard 29CFRI910.147 or the
applicable code of the local area for the industry
standards on lockout/tagout procedures before
beginning any installation or repairs.
• Authorized service personnel must ensure that
the proper personal protective equipment (PPE)
!
!
INSTALL POTABLE WATER CONNECTION
WITH ADEQUATE BACKFLOW
PROTECTION TO COMPLY WITH
APPLICABLE FEDERAL, STATE, AND
LOCAL CODES.
!
!

INTRODUCTION/SAFETY
1-9
Model C152 & C161
Introduction/Safety
1
is available and worn when required during
installation and service.
• Authorized service personnel must remove all
metal jewelry, rings, and watches before
working on electrical equipment.
WARNING! This machine has many sharp
edges that can cause severe injuries.
Examples:
• Scraper blades
• Condenser fins
• Cup/cone dispenser (if applicable)
Electrical Connections
IMPORTANT! In the United States, this
machine is intended to be installed in accordance with
the National Electrical Code (NEC), ANSI/NFPA 701987.
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, the machine should be
installed in accordance with the existing local codes.
Please contact your local authorities if you have any
questions.
Each machine requires one power supply for each data
label on the machine. Check the data label(s) on the
machine for branch circuit overcurrent protection or fuse,
circuit ampacity, and other electrical specifications.
See the wiring diagram provided inside the electrical box
for proper power connections.
WARNING! This machine must be properly
grounded! DO NOT operate this machine 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!
IMPORTANT! This machine is provided with
an equipotential grounding lug that is to be properly
attached to either the rear of the frame or the underside
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 604171) on both the removable panel and the
machine’s frame, as well as on the diagram.
IMPORTANT!
•DO NOT operate the machine with larger fuses
than specified on the data label.
• Stationary machines which are not equipped
with a power cord and a plug or another device
to disconnect the machine from the power
source must have an all-pole disconnecting
device with a contact gap of at least 0.125 in.

(3 mm) installed in the external installation.
• Machines that are permanently connected to
fixed wiring and for which leakage currents may
exceed 10 mA, particularly when disconnected,
not used for long periods, or during initial
installation, shall have protective devices to
protect against the leakage of current, such as a
GFI, and be installed by authorized personnel to
the local codes.
• Supply cords used with this machine shall be 
oil-resistant, sheathed, flexible cable, not lighter
than ordinary polychloroprene or other
equivalent 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.
!
FOLLOW YOUR LOCAL ELECTRICAL CODES.

1-10
INTRODUCTION/SAFETY
Model C152 & C161 Introduction/Safety
1
Beater Rotation
NOTICE! Beater rotation must be clockwise as
viewed looking into the freezing cylinder.
WARNING! Disconnect all power to the
machine.Failure to follow this instruction may result in
serious electrical shock.
To correct rotation on a three-phase machine,
interchange any two incoming power supply lines at the
machine main terminal block only.
To correct rotation on a single-phase machine, change
the leads inside the beater motor by following the
diagram printed on the motor label.
It is recommended that the beater rotation adjustment be
performed by a Taylor service technician.
Water Connections
(Water-Cooled Machines Only)
An adequate cold water supply must be provided with a
hand shutoff valve. The water inlet and drain connections
are located on the right side or the underside of the base.
These connections are either 3/8 in. or 1/2 in. FTP,
depending on the model of the machine. (Refer to Model
C161 Specifications on page 1-6.)
Flexible lines are recommended if local codes permit
their use. In Europe, hose sets for the connection of
appliances to water mains must comply to the 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 shutoff 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.
IMPORTANT! A backflow prevention device is
required on the incoming water connection side. Please
see the applicable national, state, and local codes for
determining the proper configuration. Water pressure to
the unit must not exceed 150 psi (1034 kPa).
Refrigerant
CAUTION! This machine contains fluorinated
greenhouse gases (F-Gas) to provide refrigeration using
a hermetically sealed circuit or within foam insulation.
This machine's type of gas, quantity, Global Warming
Potential (GWP) and CO2tonnes equivalent information
is recorded on the unit's data-label. The refrigerant used
is generally considered non-toxic and non-flammable.
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.
CAUTION! Use only approved refrigerant
listed on the machine's data-label or authorized through a
manufacturer's technical bulletin. The use of any other
refrigerant may expose users and operators to
unexpected safety hazards.
WARNING! Refrigerant liquid sprayed onto the
skin may cause serious damage to tissue. Keep eyes
and skin protected. If refrigerant burns should occur,
flush the area immediately with cold water. If burns are
severe, apply ice packs and contact a physician
immediately.
NOTICE! Taylor reminds technicians to be
aware of government laws regarding refrigerant recovery,
recycling, and reclaiming systems. If you have any
questions regarding these laws, please contact the
factory service department.
!
!

INTRODUCTION/SAFETY
1-11
Model C152 & C161
Introduction/Safety
1
IMPORTANT! Refrigerants and their
associated lubricants may be 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.
Environmental Notices
CAUTION! This machine contains fluorinated
greenhouse gases (F-Gas) to provide refrigeration using
a hermetically sealed circuit or within foam insulation.
This machine's type of gas, quantity, Global Warming
Potential (GWP) and CO2tonnes equivalent information
is recorded on the unit's data-label. The refrigerant used
is generally considered non-toxic and non-flammable.
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.
IMPORTANT! If the crossed-out waste
container 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 delivering 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
Taylor distributor.
Noise Level: Airborne noise emission does not exceed
78 dB(A) when measured at a distance of 3.3 ft. (1 m)
from the surface of the machine and at a height of 5.25 ft.
(1.6 m) from the floor.
!

1-12
INTRODUCTION/SAFETY
Model C152 & C161 Introduction/Safety
1
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 owner’s responsibility to make this fact known to any
technicians he/she employs.
It should be noted that Taylor does not warrant the
refrigerant used in its machines. 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, the above disclaimer
would become null and void. To find 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
machine in question.

INTRODUCTION/SAFETY
1-13
Model C152 & C161
Introduction/Safety
1
(Bushings and bearings)
(PCBA’s)
(Cable/Adaptor)
(Transformer)
(Motor, Beater)
(Coil assembly)
(Other metal parts)
Hazardous
Part Name
China RoHS2
Substances
(Pb) (Hg) (Cd) (Cr (VI)) (PBB) (PBDE)
(Sheet metal parts) OO O O O O
OO O O O O
(Plastic parts) OO O O O O
OO O O O O
(Motor, Compressor and fan assembly) OO O O O O
OO O O O O
(Circuit breaker and contactors) OO O O O O
OO O O O O
(Thermistors/Transducers) OO O O O O
/OO O O O O
(Labels and insulations) OO O O O O
OO O O O O
(Fittings and hardware) XOO O O O
XOO O O O
SJ/T 11364
O：GB/T 26572
X：GB/T 26572
This table is prepared in accordance with the provision of SJ/T 11364.
O: Indicates that said hazardous substance contained in all of the homogeneous materials for this
part is below the limit requirement of GB/T 26572.
this part is above the limit requirement of GB/T 26572.
X: Indicates that said hazardous substance contained in at least one of the homogeneous material for

1-14
INTRODUCTION/SAFETY
Model C152 & C161 Introduction/Safety
1
Running Specifications
Pressures/Temperatures
The following are the Taylor-recommended settings for
various components within these models. The Model
C152 and C161 uses R404A.
Expansion Valve—Low Side (Suction)
Soft Serve
C152—Air-Cooled: 20 to 22 psi (138-152 kPa) for a
normal product of 16°F to 18°F (-8.8°C to -7.7°C).
C161—Air-Cooled: 21 psi (145 kPa) for a normal product
of 16°F to 18°F (-8.8°C to -7.7°C). Set each side
separately at 15 psi to 16 psi (103 kPa to 110 kPa).
C161—Water-Cooled: 21 psi (145 kPa) for a normal
product of 16°F to 18°F (-8.8°C to -7.7°C). Set each side
separately at 15 psi to16 psi (103 kPa to 110 kPa).
Expansion Valve Adjustment
1. Place your gauge on the access valve on the suction
line (located at the compressor).
2. Adjust the pressure higher or lower by turning the
adjustment screw. Clockwise turns raise the
pressure, and counterclockwise turns lower the
pressure.
3. Make expansion valve adjustments with mix in the
cylinder and with the freezer in the Auto mode. Allow
adequate time for the pressure to stabilize.
4. For Model C161, repeat this procedure for the other
side of the machine. The expansion valve on each
side of the machine must be set separately.
Expansion Valve—High Side (Discharge)
High side pressure varies for air-cooled machines
depending on the ambient temperature.
Table 1-3
Ambient Temperature Normal Operating Head
Pressures
°F °C psi (kPa)
70 21.1 240 to 270
(1,655 to1,862)
80 26.7 270 to 300
(1,862 to 2,069)
90 32.2 300 to 340
(2,069 to 2,344)
100 37.8 340 to 380
(2,344 to 2,620)

Section 2:
2-1
Model C152 & C161
Controls
Controls
• Generation II Control Logic Board
• Service Tips for Generation II Boards
• Control Overview
• Refrigeration Schematic
• Valve Functions

2-2
CONTROLS
Model C152 & C161 Controls
2
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 Figure 2-4.
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 Number
See Figure 2-1 for an illustration of the logic board (part
number X69571SER3).
Figure 2-1
Dip Switch and Jumpers
Dip switches and jumpers are located on the logic board,
see Figure 2-1. For descriptions of dip switches, See
Figure 2-2.
Figure 2-2
Power Board Part Number
See Figure 2-4 for an illustration of the power board (part
number X69574-SER).
Thermistor Probes
There are two types of thermistor probes used on these
freezers. The resistance value of the thermistor probes
corresponds with the temperature. As the temperature
increases, the probe resistance decreases.
Approximate Probe Resistance Readings
• 10,000 ohm at room temperature 77ºF (25ºC).
• 30,035 ohm at hopper temperature 35ºF (2ºC).
• 48,636 ohm at soft serve temperature 
18ºF (-7.7ºC).
Viscosity Function
In soft-serve freezers, the logic board monitors draw
amperage 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 machine cycles
off. Therefore, the viscosity of the product will always be
consistent even though 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
X31602 - Barrel Probe (senses temperature of
product in freezing cylinder)
X55540 - Hopper Probe (senses temperature of
mix in hopper)
1
2
3
4
5
6
7
8
DIP SWITCH
UP = OFF
1-COMP 5
2-MIX LO CHIM
3-BTR 5
4-BTR 10
5-FAN 2
6-STBY DIS
7-INTERVAL
8-INTERVAL
SWITCH INTERVAL
78TIME
OFF OFF
OFF
OFF
ON
ON
ON ON
16
14
11
5
MIX DIFF.
SHUNT
4.5
13
NO
JMPR
= 2