Taylor 336 Service 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: troduction In

Safety

Model 338 Specifications

Model 339 Specifications

Model 750 Specifications Models 754/8754 Specific tions

Model 774 Specifications

Model 794 Specification s

Installation Instructions

Running Specifications

Section 2: Controls

Pump Operation

Section 3: Troubleshooting

Section 4: Parts

1 2

2Refrigerant 3Model 336 Specifications 4 5 6 7Models 751/8751 Specifications

9 10 11 12

14Generation II Control Logic Board 19Service Tips for Generation II Boards

22Control Overview 23

26General Troubleshooting Guide 29Troubleshooting Pump Style Freezers 30Electrical Trou leshooting b

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 53 Model 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.

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.

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

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.

Electrical

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

Maximum Minimum Fuse Size

Circuit Ampacity

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

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.

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.

Electrical

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

Maximum Minimum Fuse Size Circuit Ampacity

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

availability. (For exact electrical information, always refer to the data label of the unit.)

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.

Electrical

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

Maximum Minimum Circuit Fuse Size Ampacity

Left

Right Left Right

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

availability. (For exact electrical information, always refer to the data label of the unit.)

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.

Electrical

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

Maximum Minimum Fuse Size Circuit Ampacity

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

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

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.

Electrical One dedicated connection.

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

Maximum Minimum

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.

Electrical

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

Maximum Minimum Circuit Fuse Size Ampacity

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

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

availability. (For exact electrical information, always refer to the data label of the unit.)

Air Cooled

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.

Electrical

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

Maximum Minimum Circuit Fuse Size Ampacity

Left

Right Left Right

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

availability. (For exact electrical information, always refer to the data label of the unit.)

Air Cooled

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.

Electrical

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

Maximum Minimum Circuit Fuse Size Ampacity

Left Right Left Right

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).

PROPERLY GROUNDED! FAILURE TO DO SO CAN

CAUTION: THIS EQUIPMENT MUST BE

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.

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.

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.

Ambient Temperature

F. C. PSI

70° 21.1° 240 - 270

80° 26.7° 270 - 300

90° 32.2° 300 - 340

100° 37.8° 340 - 380

Normal Operating Head

Pressures

(1,655 - 1,862 kPa)

(1,862 - 2,069 kPa)

(2,069 - 2,344 kPa)

(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).

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.

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.)

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:

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):

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

X34466 - Hopper Probe (Senses temperature

X50717 - Hopper (Senses temperature of mix in

X36267 - Cabinet Probe (Senses mix cabinet

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).

freezing cylinder.)

of mix in hopper.)

hopper with new Generation II.)

air temperature.)

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

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 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.)

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

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

correct one. Determine whether the difference is acceptable. If a probe is actually faulty, the difference will be great.

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 0 32.660 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 OUT MIX STANDBY WASH AUTO PUMP

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.

Mix Relay Fan Relay Pump Relay Beater Motor Relay Compressor Relay Spinner Relay Portion Relay

4. Ten seconds later, the fan relay closes.

5. Three seconds later, the fan relay opens and the MIX OUT light turns off.

6. Ten seconds later, the pump relay closes.

7. Three seconds later, the pump relay opens and the mix light turns off.

8. Ten seconds later, the beater motor relay closes.

9. Three seconds later, the beater motor relay opens and the STANDBY light turns off.

10. Ten seconds later, the compressor relay closes.

11. Three seconds later, the compressor relay opens and the wash light turns off.

12. All lights are off and a tone sounds for three seconds. This designates the end of the first section.

If all or most of the power board relays fail to close, the logic panel is defective. If only one relay fails to close, the power board is defective. This test can be used to determine if a problem exists with the logic panel, the power board, or elsewhere in the freezer. In other words, if during the test the beater relay closes on the power board, but the beater motor contactor does not operate, the problem occurs after the command reaches the power board.

These lights create a bar graph which is directly related to the product temperature. "MIX" is warm and "PUMP" is cold.

1. The SET POINT light is lit, indicating that the control is reading the soft serve viscosity potentiometer.

2. Rotate the adjustment screw back and forth from "MIN" to "MAX". The bar graph should travel accordingly. This indicates that the potentiometer is functional.

If the bar lights do not react, the logic panel is defective.

Important: If the freezer's controls have been set previously, return the adjustment to its original position. For example, if the WASH light was lit before an adjustment screw was rotated, before going to the next step, rotate the adjustment screw until the WASH light is lit again.

3. Press the MIX keypad once.

Self-Test - Part II

When the first section of the self-test is complete, the control will advance to the starting point of the second section. The technician will have to complete this portion of the test. The first part of this section verifies the function of the control potentiometers (adjustment screw).

During this test, the MIX, STANDBY, WASH, AUTO, and PUMP lights function in direct relationship with the "MIN" and "MAX" adjustments of the potentiometer. In other words, when the adjustment screw is turned all the way to "MIN", the MIX light will be lit. When the adjustment is turned all the way to "MAX", the PUMP light will be lit. If the screw adjustment is made between the "MAX" and the "MIN" adjustment, one of the other lights will illuminate depending on the adjustment.

4. The MIX LOW light is lit, indicating that the control is reading the MIX potentiometer.

5. Rotate the adjustment screw as in Step 2,

6. Press the MIX keypad once.

7. The MIX OUT light is on, indicating the control is reading the STANDBY potentiometer.

8. Rotate the adjustment screw as in Step 2.

9. Press the MIX keypad once.

10. The MIX LOW light is lit, indicating that the control is reading the "MIX 1" terminal.

11. The capability of this terminal to read the thermistor probe can be checked by the following method:

a. Remove the thermistor probe wire from the

"MIX 1" terminal.

b. Connect the "MIX 1" terminal directly to

ground (simulating a warm probe). The MIX light will illuminate.

c. Remove the terminal connection from

ground (simulating a cold probe). The PUMP light will illuminate.

If the lights do not react, the panel is defective.

12. Press the MIX keypad once.

13. The MIX OUT light is lit, indicating that the control is now reading the BARREL (freezing cylinder) probe terminal.

14. Check the freezing cylinder probe (as in

Step 13) by removing the wire from the panel.

15. Press the MIX keypad again, and the self-test program is terminated.

Control Overview

Pump Operation

The pump operates under the following conditions:

Soft Serve Mix Pumps

The soft serve mix pump will be active for 30 seconds whenever the AUTO mode is entered. If a MIX OUT condition forces a side of the machine into the STANDBY mode of operation, the mix pump will not be active.

Pump Key

When the PUMP key is pressed, the pump is active by itself or with the WASH mode of operation.

Mix Pump Draw Timer

During the AUTO mode, the mix pump will operate for 10 seconds after every draw of soft serve product.

ITEM DESCRIPTION PART NO.

1 SCREW-1/4-20x 3/4 020128-2

2 MOTOR-REDUCER (50/60) 036955-34

2A MOTOR 049246-34

2B GEAR (50/60 HZ) 049247-34

3 MOUNT-MOTOR 036934

SLEEVE A.-MIX PUMP- PH71,

8751,8754

X45012

ITEM DESCRIPTION PART NO.

5 COUPLING-MOTOR-FLEXIBLE 047936

6* SEAL-INPUT 048836

7* SEAL-OUTPUT 048837

8 NUT-PUMP SLEEVE 036933

*NOT SHOWN

General Troubleshooting Guide

PROBLEM PROBABLE CAUSE REMEDY

1. No product is being dispensed. Low on mix. The MIX OUT light is on. Add mix to the mix hopper The power switch is in the OFF Place the power switch to the ON

2. The product is too thick. Insufficient mix in the freezing cylinder. Check the air/mix pump assem y. bl

position. position and press the AUTO keypad . Beater motor is out on reset. Allow the beater motor to cool. Place

the power switch to the OFF position. Press the reset button firmly. Place the power switch to the ON position an d press the WASH keypad. Open the side access panel and observe that the drive shaft is turning CLOCKWI E S as viewed from the front of the unit. Press the AUTO eypad to return to k

the AUTO mode. Air/mix pump is incorrec assembled tly Follow assembly procedures carefully. or improperly lubricated. Missing or incorrectly installed spring Replace or correctly install the spr g in and poppet in air/mix pump. and poppet on the mix inlet fitting. The mix pump ball crank is broke . n Replace the component. The pump motor is not activated. Push the reset button. The draw valve

must be fully aised to activate the r

pump motor. Incorrect usage of the mix feed tube Follow the correct feed tube (gravity style freezers). procedures and use of the air orific . e

The mix inlet tube ust be fully m

submerged in mix. Improper priming procedures. Drain the freezing cylinder and

re-prime the unit. The air/mix ump is incorrectly p Follow assembly procedures carefully. assembled. The viscosity control is set too cold. Adjust the viscosity.

PROBLEM PROBABLE CAUSE REMEDY

3. The product is too soft. The draw rate is set too fast. Adjust the draw rate to 5 - 7-1/2 oz.

4. The mix in the hopper is too The hopper cover is not in position. Clean the hopper cover and place it in warm.

5. The mix in the hopper is too cold. The hopper temperature is out of Adjust the temperature control.

6. Product is collecting on top of the The top o-ring on the draw valve is Lubricate properly or replace the freezer door. improperly lubricated or worn. o-ring.

7. Excessive mix leakage from the The bottom o-ring on the draw valve is Lubricate properly or replace the bottom of the door spout. improperly lubricated or worn. o-ring.

8. Excessive mix leakage into the The seal on the drive shaft is Lubricate properly or replace the seal. long drip pan. improperly lubricated or worn.

9. Excessive mix leakage from the Worn or missing o-rings on the pump Install or replace the o-rings. rear of the freezer into the short drive shaft.

drip pans.

10. The drive shaft is stuck in the Mix and lubricant have collected in the Brush clean the rear shell bearing drive coupling. drive coupling. area regularly.

Outdrawing the capacity of the The continuous draw rate is freezing cylinder. approximately 15 cones. There is inadequate air space around A minimum of 3 " (7.6 cm.) of the unit. clearance around all sides is required.

Dirty condenser or air filters on air Clean regularly. cooled units. Inadequate water supply on water Check the water supply. Check the cooled units. water lines for leaks or kinks. Bad scraper blades. Replace the scraper blades. The viscosity control is set too warm. Adjust the viscosity. Incorrect usage of the mix feed tube Follow the correct feed tube (gravity style freezers). procedures and use of the air orifice.

The hopper temperature is out of Adjust the temperature control. adjustment.

adjustment.

The seal is installed inside-out on the Install the seal correctly. drive shaft.

Inadequate lubrication of the drive Lubricate properly. shaft. The drive shaft and beater assembly Verify the refrigerant charge and work forward. check for a shorted freezing cylinder. Worn rear shell bearing. Replace the component. Gear box out of alignment. Re-align the gear box.

Rounded corners of the drive shaft, Replace worn component(s). the drive coupling or both. The gear box is out of alignment. Re-align the gear box.

(142 g. - 213 g.) of product by weight every 10 seconds.

Exception: The minimum requirement for the 338 and 750 is 6" (15.2 cm.).

position.

PROBLEM PROBABLE CAUSE REMEDY

11. Freezing cylinder walls are Missing or worn front bearing. Install or replace the front bearing. scored. Broken beater pins (pump style Replace the beater assembly. When

12. The pump will not operate in the The pump motor is not activated. Push the reset button. PUMP mode.

13. The unit will not run when in the The unit is unplugged. Plug into wall receptacle. AUTO mode. The beater motor is out on reset. Allow the beater motor to cool. Place

14. Product is not feeding into the The mix inlet hole is frozen up. The hopper temperature needs freezing cylinder.

15. Product is "popping" when drawn. The draw rate is set too fast. The draw rate should be set at 5 -

16. The MIX LOW and MIX OUT There is milkstone build-up in the Clean the hoppers thoroughly. probes are not functioning. hopper.

freezers, only). installing scraper blades, be sure they

The beater assembly is bent. The beater assembly must be

The gear box is out of alignment. Re-align the gear box.

The membrane switch is defective. Replace the switch.

The circuit breaker is off, or the fuse is Turn the breaker on, or replace the blown. fuse.

Low on mix. The MIX OUT light is on. Add mix to the mix hopper and press

The water is turned off, on water Turn the water on. cooled units.

Incorrect usage of the mix feed tube Follow the correct feed tube (gravity style freezers). procedures and use of the air orifice.

The pump is assembled incorrectly. Assemble and lubricate according to

are properly attached over the pins.

replaced.

the power switch to the OFF position.

Press the reset button firmly. Place the

power switch to the ON position, and

press the WASH keypad. Open the

side access panel and observe that

the drive shaft is turning clockwise as

viewed from the front of the unit. Press

the AUTO keypad to return to the

AUTO mode.

Note: Do not use metal objects to

press the reset button.

the AUTO keypad.

adjustment.

7-1/2 oz. of product per 10 seconds.

instructions in the Operator's manual.

Troubleshooting Pump Style Freezers

PROBLEM PROBABLE CAUSE REMEDY

1. The air/mix pump will not operate The circuit breaker is off. Check the breaker. when the PUMP keypad is

pressed. The power cord is unplugged. Plug in the power cord.

2. The air/mix pump will not operate The pump motor is out on reset. Press the PUMP keypad to cancel the when the draw valve is opened and the unit is in the AUTO mode.

3. The piston travels back and forth, Inspect the check bands. The check bands must be installed but product is not being pumped.

4. Excessive pump cylinder wear. Inadequate or incorrect lubrication of Follow lubrication procedures

5. Pitting occurring inside the pump Cleaner was left inside the pump After brush cleaning the pump cylinder. cylinder. cylinder, allow it to dry. Follow

6. The ball crank of the motor Incorrect rotation of pump motor. Reverse pump rotation. reducer is broken.

7. Too much pressure is in the Plugged relief hole in the liquid valve Clean. freezing cylinder. body below the poppet.

8. Not enough pressure is in the The spring in the liquid valve body is Replace. freezing cylinder. weak or bent.

The freezer is out on reset. Reset the freezer. The pump motor is out on reset. Press the PUMP keypad to cancel the

pump operation. Press the reset button on the side of the pump motor reducer. Press the PUMP keypad to continue pump operation.

The pump motor relay is Replace the relay. malfunctioning.

Inspect the o-rings. O-rings must not be worn, torn, or fit

Check the pump cylinder. The piston and liquid valve body must

The spring or poppet is missing or Replace. defective.

pump cylinder. carefully.

Incorrect ball crank rotation. (Must be Reverse pump rotation. counterclockwise).

The draw switch is malfunctioning. Replace the draw switch. The poppet is missing. Install the poppet.

pump operation. Press the reset button on the side of the pump motor reducer. Press the PUMP keypad to continue pump operation.

correctly, fit tightly, and not have any holes or lubrication.

too loosely.

be assembled correctly, and fit snugly in the pump cylinder.

disassembly procedures carefully.

Electrical Troubleshooting

The following information provides a sequential list of electrical components that L-1 power travels through to initiate various operations.

Auto Mode of Operation:

L-1 power travels through the power switch, beater overload switch, the compressor high pressure cut-out switch, the overload terminal (OL) on the power board, the BTR terminal of the power board, and energizes the coil of the beater motor contactor. L-1 power travels through the power switch, beater overload switch, the compressor high pressure cut-out switch, the overload terminal (OL) on the power board, the COM terminal of the power board, and energizes the coil of the compressor contactor. L-1 power travels through the power switch, beater overload switch, the compressor high pressure cut-out switch, the L-1 terminal of the power board, the MIX terminal of the power board, and energizes the hopper refrigeration compressor and condenser fan.

Wash Mode of Operation:

Pump Mode of Operation:

L-1 power travels through the power switch, beater overload switch, the compressor high pressure cut-out switch, the overload terminal (OL) on the power board, the PUMP terminal of the power board, and energizes the coil of the pump motor.

Warranty Explanation

Class 103 Parts: The warranty for new equipment parts is one year from the original date of unit

Class 212 Parts: The warranty for new equipment parts is two years from the original date of unit

Class 512 Parts: The warranty for new equipment parts is five years from the original date of unit

Class 000 Parts:

CAUTION: Warranty is valid only if required service work is provided by an Authorized Taylor Service Technician.

installation, with a replacement parts warranty of three months.

installation, with a replacement parts warranty of twelve months.

installation, with a replacement parts warranty of twelve months.. Wear Items - no warranty.

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