Belshaw Donut Robot Mark 2 GP Gas User Manual

Donut Robot

Mark II Gas

Operator’s Manual

and

Technical Supplement

Belshaw Bros., Inc. 814 44th Street NW, Suite 103 Auburn, WA 98001 USA Tel: (206) 322-5474 Fax: (206) 322-5425 Toll Free (US): 1-800-578-2547 E-mail: service@belshaw.com www.belshaw.com

Donut Robot



Mark II-Gas

Operator’s Manual

Belshaw Bros., Inc.

814 44

Phone: 1-206-322-5474 • Fax: 1-206-322-5425

Email: service@belshaw.com • http://www.belshaw.com

ST NW Suite 103

Auburn, WA 98001

If you accept the machine from the shipping company, you are, in effect, saying that the machine is in good condition, and you must pay for the machine. Belshaw cannot pay for

shipping damage, because the freight company has accepted the machine from Belshaw in good condition, and is responsible for its safe delivery. For your protection, inspect the machine to see that no parts are bent, scratched, or otherwise damaged. If any damage has occurred in shipping, file a freight claim with the shipping company immediately.

IMPORTANT

Keep this manual for future reference.

To unpack the Donut Robot Mark II-Gas and transport it to the workstation requires two people:

1. Remove the foam and other packing

materials from the two boxes.

2. Carry the hopper, plunger, and swing

column to the work station.

3. Coil the cutter head power cord and carry the cutter head to the work station.

4. Carry the conveyor assembly the work station.

5. Move the fryer to the workstation.

EQUIPMENT RECORD

Please provide the information below when you correspond with us about your machine.

Purchased by ______________________________________________________________________

Installed by _______________________________________________________________________

Date of installation __________________________ Model number _________________________

Serial number ______________________________________________________________________

011808

MN-1017EN

Belshaw Bros., Inc.

814 44TH ST NW Suite 103

Auburn, WA 98001 USA

Phone: 206-322-5474 • Fax: 206-322-5425

Email: service@belshaw.com • http://www.belshaw.com

Contents

1 Operation 1

Taking Safety Precautions 1 Making Cake Donuts 2 Making Yeast-Raised Donuts 4

2 Cleaning 7

Cleaning the Hopper and the Plunger 7 Cleaning the Conveyor and the Kettle 8

3 Maintenance 13

Taking Care of the Plunger, Hopper, and Cylinder 13 Lubricating 13

4 Related Products 14

FT-42 Feed Table 14 Roto Cooler 17 Icing Finishing Tree and Roto Cooler 19 Sugaring Tray and Roto Cooler 21 Filter Flo Siphon 22 Shortening Reserve Tank 25

5 Donut-Making Helps 26

Tips on Making Quality Cake Donuts 26 Temperature Conversion 27 Ratios of Plunger Sizes to Donut Weights 27 Calculating Correct Water Temperature 27

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Donut Robot Mark II-Gas OM MN-1017EN iii

Preface

The Donut Robot Mark II-Gas is designed to automatically cut and fry cake donut products, and to fry yeast-raised donut products. It is not designed to cut or fry any other products. The Mark II Gas is available for LP Gas and Natural Gas in the following electrical configurations:

 120 volts, 1 phase, 50/60 hertz The Mark II-Gas is designed to be used on a flat,

stationary table or countertop, with the operator standing opposite the control box and flue stack of the machine. The operator must work safely at all times and read this manual and follow its instructions and warnings. Study the instructions and warnings in this manual carefully. A thorough understanding of how to install, maintain, and safely operate the Donut Robot Mark II-Gas will prevent production delays and injuries.

The Mark II Gas produces only 71.5 dB(A) of equivalent A-weighted sound pressure at workstations. This has been determined during a dry run of the machine, using a Bruel & Kjaer sound level meter, type 2236.

cause serious burns or could cause someone to slip on the floor and be seriously injured.

 To avoid electrocution or other injury,

unplug the machine before attempting any adjustment, repair, disassembly, or cleaning.

 Hot shortening can cause serious burns.

Make sure that the system and the shortening are cool before attempting any adjustment, repair, disassembly, or cleaning.

 To avoid damaging the machine, never use

force to assemble, disassemble, operate, clean, or maintain it.

 Be careful never to get shortening, water, or

other materials on the floor. If anything does get spilled on the floor, mop it up immediately. Materials on the floor can cause people to slip or fall, resulting in serious injury or loss of life.

 To prevent unintentional startup and possible

fire, unplug the machine if there is a local power outage. When the power is restored, it is safe to plug the machine in again.

To use the Mark II-Gas safely, heed the following warnings and all other warnings that appear in this manual:

 Make sure the machine is secured to the work

surface. Doing so will prevent the machine from moving or falling, which could cause serious injury.

 Never let water and hot shortening come in

contact with each other. Moisture causes hot shortening to spatter, which may cause serious burns.

 Do not overfill the kettle with shortening. If

shortening overflows the kettle, it could

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iv MN-1017EN Donut Robot Mark II-Gas OM

 To avoid fire and personal injury, always

shut the machine down completely and wait at least five minutes before igniting the pilot again.

 To avoid electrocution, make sure that all

electrical cords are not frayed or cracked and that they do not pass through any water or shortening.

 Make sure that all electrical cords are routed

so that no one will trip over them.

 To avoid serious injury or death, always keep

the fryer area free and clear from combustible materials.

1 Operation

For general information on donut production, refer to Section 5, “Donut-Making Helps.”

Taking Safety Precautions

Contact you local gas supplier and obtain information about what to do if there is a gas leak. Post this information in a prominent

location. Make sure that all employees know what to do.

WARNING

To avoid the possibility of fire, explosion,

property damage, serious burns, and even

death, never store gasoline or any other

flammable liquid or vapor near the fryer.

WARNING

To avoid serious injury or death, if you

smell gas or suspect a gas leak, proceed as

follows: 1. Turn off the gas. 2. Evacuate

the building. 3. Do not touch any electrical

switch or telephone until you are sure no

spilled gas remains.

The fryer is bolted to the work surface to prevent it from tipping over and splashing hot liquid on the operator.

WARNING

To avoid serious burns, other injury, and

even death, never move the fryer when

liquid is in it. If you want to move the

fryer, follow the instructions in “Moving

the Fryer,” in Section 1, “Installation.”

If you want to re-start the machine after

you have shut it down, do the following:

1. Move the POWER switch on the control box to the OFF position. 2. Move the gas

control valve to the PILOT position.

3. Lightly press down the valve and turn it

to the OFF position. 4. WAIT 5

MINUTES. 5. Re-light the pilot, as

explained below.

FAILURE TO WAIT 5 MINUTES FOR

THE GAS TO DISSIPATE COULD

RESULT IN A FIRE OR AN EXPLOSION

WHEN YOU RE-LIGHT THE PILOT.

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Donut Robot Mark II-Gas OM MN-1017EN 1

Making Cake Donuts

Read each step completely before doing what it tells you to do.

WARNING

To avoid serious injury or death, before

you begin working, make sure that there is

no combustible material in the area of the

fryer.

12. If necessary, install the swing column,

connect the swing connecting rod, install the cutter head, and install the hopper and the plunger.

13. Connect the machine to an appropriate

power source.

14. Check the connection of the machine to the

gas source to make sure that it is tight.

15. When the shortening reaches the correct

frying temperature, it should reach the middle of the flight bars.

Shortening expands as it increases in temperature. This means that unless the shortening is at frying temperature when you put it in the kettle, you should put it in gradually. Let the shortening in the kettle heat up before you add more.

Put shortening in the kettle using one of the these methods.

WARNING

Air spaces can cause the shortening to

overheat and catch on fire.

5. Turn the combination gas control valve knob

to the PILOT position.

6. Press and hold down the valve knob. At the

same time, push the red ignition button until you can see a flame through the opening on the outfeed end of the fryer.

 Pre-melt shortening in a pan on the

stove, heat only slightly to liquefy the shortening and carefully pour it into the kettle.

WARNING

Hot shortening causes severe burns.

 Use the optional EZ Melt to melt

shortening and transfer it to the kettle. See your EZ Melt manual.

 Put solid shortening into the kettle,

packing it tightly around the thermostat bulbs.

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2 MN-1017EN Donut Robot Mark II-Gas OM

7. Continue holding down the valve knob for

about 20 seconds. When you release the valve, make sure the flame is still on the pilot.

WARNING

If the pilot is out, do the following:

1. Turn the combination gas control valve knob to the PILOT position. 2. Lightly

press down the valve knob and turn it to

OFF. 3. WAIT 5 MINUTES. 4. Re-light the

pilot. FAILURE TO WAIT 5 MINUTES

FOR THE GAS TO DISSIPATE COULD

RESULT IN A FIRE OR AN EXPLOSION

WHEN YOU RE-LIGHT THE PILOT.

8. Move the valve knob switch to the ON

position.

13.

Disengage the swing connecting rod from

the swing column throw arm and swing the hopper away from over the fryer.

14.

Adjust the size selector dial on the cutter

head’s crankshaft assembly. This dial regulates the donut weight. The higher the setting, the larger the donuts will be. Adjust the dial setting as follows:

Unscrew the dial lock nut 1/2 turn.

Turn the dial to the desired position, as

indicated by the marks on the crank plate.

Tighten the dial in place with the lock

nut. Tighten it using your fingers only.

Put dough into the hopper. Prime the hopper

15. to expel any air that may be trapped in the bottom of it. To prime the hopper:

Set the thermostat to the desired setting.

The pilot light on the control box will come on, indicating that the shortening temperature is lower then the desired temperature.

10.

Note: If the high temperature limit control

does break the circuit, push the red reset button on the back of the control box.

11.

Wait for the shortening to reach the desired

temperature. When it does, the pilot light will go out. DO NOT run the conveyor until all the shortening has melted.

12.

If using the optional Shortening Reserve

Tank, fill it with shortening. Then position it on the conveyor side panels either ahead of or behind the turner, but not above it. The heat of the fryer will melt the shortening in the tank.

Hold a mixing bowl under the cutter.

Hold down the prime switch on the

cutter head and run the cutter until it has dropped two or three donuts into the bowl.

16.

17.

18.

19. Turn on the cutter using the power switch on

20.

Note: Holding down the prime switch causes the cutter to run continuously without the normal delay between cuts.

Put the dough in the bowl back in the

hopper.

Return the hopper into position over the fryer

and reconnect the swing connecting rod to the swing column throw arm.

Choose the appropriate fry time for your

product using the fry time control knob on the control box.

Using the switch on the control box, select

the number of donuts to cut during each swing cycle of the hopper.

the cutter head.

Turn on the conveyor drive using the power

switch on the control box.

one or twoyou want

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Donut Robot Mark II-Gas OM MN-1017EN 3

Note: If the conveyor becomes jammed, a warning buzzer will sound about a minute later and the buzzer will stop when the conveyor is turned off. The conveyor drive is impedance-protected so it will not burn out due to jamming.

WARNING

If the conveyor becomes jammed: 1. Turn

off the conveyor drive and the heater. 2.

Allow the system to cool down. HOT

SHORTENING IS DANGEROUS.

3. Determine the cause of the jamming.

4. Clear it. 5. Restart the system.

21. Continue adding shortening to the kettle to

maintain the proper shortening level (see step 4). There are three ways to do this:

 Melt some shortening in a pan on the

stove and carefully pour it into the kettle.

 If you are using the optional EZ Melt,

transfer more shortening from it. See your EZ Melt manual.

 If you are using the optional Shortening

Reserve Tank, push open the supply valve.

22.

Continue adding dough to the hopper as

needed. You can add dough to the hopper without priming it again as long as it does not become empty. If the hopper does become empty, you must prime it again.

23.

When you fill the hopper for the last time,

you will want to use all of the dough in the hopper. To do so, push the dough to the bottom of the hopper using a rubber scraper or spatula. Be careful not to jam the scraper in the donut cutter.

WARNING

To avoid injury, never put your hand in or

under the hopper while the machine is on.

24. To shut down the machine when you are

done:

Move the POWER switch on the control

box to the OFF position.

Turn the combination gas control valve

knob to the PILOT position. Lightly press down the valve knob and turn it to the OFF position.

Making Yeast-Raised Donuts

Read each step completely before doing what it

tells you to do.

WARNING

To avoid serious injury or death, before

you begin working, make sure that there is

no combustible material in the area of the

fryer.

1. Remove the hopper and plunger, the cutter

head, and the swing column, if they are installed.

Connect the machine to an appropriate

2. power source.

Check the connection of the machine to the

gas source to make sure that it is tight.

When the shortening reaches the correct

4. frying temperature, it should reach the middle of the flight bars.

Put shortening in the kettle using one of these methods:

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4 MN-1017EN Donut Robot Mark II-Gas OM



Pre-melt shortening in a pan on the stove, heat slightly to liquefy and carefully pour it into the kettle.

WARNING

Hot shortening causes severe burns.

 Use the optional EZ Melt to melt

shortening and transfer it to the kettle. See your EZ Melt manual.

 Put solid shortening into the kettle,

packing it tightly around the thermostat bulbs.

WARNING

Air spaces can cause the shortening to

overheat and catch on fire.

5. Turn the combination gas control valve to the PILOT position.

6. Press and hold down the valve. At the same time, push the red ignition button until you can see a flame through the opening on the outfeed end of the fryer.

7. Continue holding down the valve for about 20 seconds. When you release the valve, make sure the flame is still on the pilot.

8. Move the POWER switch to the ON position.

9. Set the thermostat to the desired setting. A pilot light on the control box will come on, indicating that the shortening is heating up to the desired temperature. It will go out if the high temperature limit control breaks the circuit.

Note: If the high temperature limit control does break the circuit, push the red reset button on the back of the control box.

10. Wait for the shortening to reach the desired temperature. When it does, the pilot light will go out. DO NOT run the conveyor until all the shortening has melted.

11. If are using the optional Shortening Reserve Tank, fill it with shortening. Then position it on the conveyor side panels either ahead of or behind the turner, but not above it. The heat of the fryer will melt the shortening in the tank.

12. Install your Feed Table and load proof cloths on it. Refer to Section 4, “Related Products,” for complete installation and operation instructions for the Feed Table.

13. Choose the appropriate fry time for your product using the fry time control knob on the control box.

14. Turn on the conveyor drive using the power switch on the control box.

WARNING

If the pilot is out, do the following:

1. Turn the combination gas control valve to the PILOT position.

2. Lightly press down the valve and turn it to the OFF position.

3. Wait 5 minutes.

4. Re-light the pilot, as explained above. Failure to wait 5 minutes for the gas to

dissipate could result in a fire or an

explosion when you re-light the pilot.

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Donut Robot Mark II-Gas OM MN-1017EN 5

WARNING

If the conveyor becomes jammed: 1. Turn

off the conveyor drive and the heater. 2.

Allow the system to cool down. HOT

SHORTENING IS DANGEROUS.

3. Determine the cause of the jamming.

4. Clear it. 5. Restart the system.

15. Continue adding shortening to the kettle to maintain the proper shortening level (see step 4). There are three ways to do this:

 Melt some shortening in a pan on the

stove and carefully pour it into the kettle.

 If you are using the optional EZ Melt,

transfer more shortening from it. See your EZ Melt manual.

 If you are using the optional Shortening

Reserve Tank, push open the supply valve.

16. Continue loading proof cloths onto the Feed Table as needed.

17. To shut down the machine when you are done:

a. Move the POWER switch on the control

box to the OFF position.

b. Turn the combination gas control valve

to the PILOT position. Lightly press down the valve and turn it to the OFF position.

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6 MN-1017EN Donut Robot Mark II-Gas OM

2 Cleaning

WARNING

Thoroughly clean and dry the floor if

shortening, water, or other materials that

spill. Materials spilled on the floor can

cause serious injury or loss of life.

WARNING

To avoid electrocuting yourself or

damaging the machine, never allow water,

steam, shortening, cleaning solution, or any

other liquid to enter the control box or the

cutter head assembly.

Cleaning the Hopper and the Plunger

General guidelines:

 Use household dishwashing detergent.

Do not use strong alkali cleaners such as lye, soda ash, or trisodium phosphate, as these discolor and corrode aluminum.

 Wash, dry, and lubricate parts

thoroughly to prevent rusting.

To clean the hopper and the plunger:

1. Unplug the cutter head power cord.

2. Remove the plunger and the hopper. To do so, reverse the procedures found in Steps 2 and 3 of “Assembling the Cutter” in Section 1 of the Technical Supplement.

3. Pre-soak the parts, if necessary, to loosen stubborn or dried-on deposits.

4. Wash the hopper and the plunger separately in hot water and a detergent recommended for aluminum. Use a non-scratching plastic scouring cloth to remove soil and restore luster.

5. Rinse the hopper and the plunger separately in clear, hot water (170

6. Dry each part completely.

7. Dip the plunger and the hopper cylinder in mineral oil or liquid shortening to prevent rust and sticking.

8. Wipe the cutter head assembly with a soft cloth dampened with hot water and an appropriate cleaner. Wipe it with another damp cloth to remove the cleaner. Wipe it dry.

-190F/77-88C).

 When washing parts by hand, wash each

part separately; do not put any other utensil or dish in the sink with the part being washed.

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Donut Robot Mark II-Gas OM MN-1017EN 7

To avoid electrocuting yourself or

damaging the machine, never immerse the

CAUTION

cutter head assembly.

Cleaning the Conveyor and the Kettle

There are three basic steps to cleaning the conveyor and the fryer kettle: removing the shortening, washing, and rinsing. You must perform all three steps and perform them in the order listed.

Removing the Shortening

WARNING

To avoid being burned or electrocuted,

disconnect the machine from the power

source before cleaning the fryer.

Figure 2-1. Draining the Shortening off of

the Conveyor.

6. Remove the turner assembly as follows: a. Move the flight bars of the conveyor

until the turner is in the middle of a flight pocket.

1. Disconnect the machine from the power source.

2. Let the shortening cool to 100

3. Unplug the cutter head power cord.

4. Lift the cutter head off the swing column.

5. Remove the conveyor assembly as follows: a. Obtain two pieces of wood, at least 1” x

1” x 15” (2.5 cm x 2.5 cm x 38 cm). b. Lift off the swing connecting rod. c. Lift the conveyor assembly from the

conveyor locating pin and pull it away

from the control box to disengage the

main drive shaft coupling from the

conveyor drive coupling. d. Lift the outfeed end of the conveyor.

Slide one piece of wood under the

conveyor and lay it across the top of the

kettle. Lift the other end of the conveyor

and do the same thing with the other

piece of wood. The conveyor will now

be resting on the two pieces of wood.

Let the shortening drain off of the

conveyor and into the kettle. See Figure

2-1.

F/38C.

b. Swing the turner cam weight up out of

position.

c. Lift up and pull out on the turner cam

assembly. See Figure 2-2.

Figure 2-2. Removing the Turner Cam

Assembly.

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8 MN-1017EN Donut Robot Mark II-Gas OM

Figure 2-4. Removing the Drop Plate.

Figure 2-3. Removing the Turner Assembly.

d. Lift out the turner assembly. See Figure

2-3.

e. To reassemble, reverse this procedure.

7. Remove the drop plate at the infeed end of the conveyor by lifting the forward end and sliding it toward the rear of the conveyor. (See Figure 2-4.) Wipe it clean with a damp cloth. Do not clean the drop plate with an abrasive cleaner, as doing so will cause donuts to stick to it.

8. After the shortening has drained off of the conveyor assembly, set the conveyor assembly aside.

9. Check again to see that the shortening in the kettle has cooled to 100

F/38C.

10. Remove the shortening from the kettle using one of these methods:

 Use an optional Filter Flo Siphon to

siphon the shortening into one or more large metal buckets. (See the instructions in Section 4.) Be careful not to disturb the sediment that has accumulated in the bottom of the kettle.

 Tilt the control box assembly back,

raising the thermostat and high limit out of the kettle. Lift the kettle out of the fryer case and carefully pour the shortening into one or more large metal buckets. Be careful not to disturb the sediment that has accumulated in the bottom of the kettle.

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Donut Robot Mark II-Gas OM MN-1017EN 9



Using a small saucepan or a metal pitcher, scoop as much of the shortening as you can into one or more large metal buckets. Then lift the kettle out of the fryer case and carefully pour the rest of the shortening into a metal bucket. Be careful not to disturb the sediment that has accumulated in the bottom of the kettle.

WARNING

Do not use plastic buckets. If the

shortening is not cool enough, the buckets

will melt; possibly causing you to be

burned, and causing shortening to get on

the floor.

WARNING

Do not allow the shortening to overflow the

buckets. Shortening will get on the floor,

and if the shortening is not cool enough,

you may be burned.

WARNING

Thoroughly clean and dry the floor if

shortening does spill. Shortening on the

floor can cause serious injury or loss of life.

11. Return the kettle to the fryer case, if you have removed it.

12. Tilt the control box assembly back, raising the thermostat and high limit out of the kettle.

13. Lift the kettle out of the fryer case. Remove and dispose of the remaining shortening and the accumulated sediment. Dry the outside of the kettle.

14. Put the kettle back in the fryer case.

15. Tilt the control box assembly down.

16. Put the drop plate and the turner assembly back on the conveyor assembly.

17. Install the conveyor assembly.

Washing

1. Pour hot water into the kettle, up to the normal level of the shortening. Add about 2 oz/59 ml of trisodium phosphate or other appropriate cleaner.

2. Connect the machine to the power source. Heat the solution to 200 the conveyor. Keep the solution at this temperature for 15-20 minutes.

3. Turn off the conveyor and scrub the soiled parts while the solution is under heat. Do not use any abrasive cleaners or scrapers.

4. Turn off the heater and disconnect the machine from the power source. Allow the cleaning solution to cool to 100

5. Remove the conveyor and tilt the control box back as you did before.

6. Remove the cleaning solution from the kettle using one of these methods:

 If you have an optional Filter Flo

Siphon, remove its filter assembly. Then use the Filter Flo to siphon the cleaning solution into one or more large metal buckets. (See the instructions in Section

4.) When the cleaning solution has stopped draining, carefully carry the buckets to the sink and slowly pour the solution into the sink.

 Lift the kettle out of the fryer case,

carefully carry it to the sink, and slowly pour the cleaning solution into the sink.

 Using a small saucepan or a metal

pitcher, scoop as much of the cleaning solution as you can into one or more large metal buckets. Then lift the kettle out of the fryer case and carefully pour the rest of the cleaning solution into a metal bucket. Carefully carry the

F/93C. Turn on

F/38C.

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10 MN-1017EN Donut Robot Mark II-Gas OM

buckets to the sink and slowly pour the solution into the sink.

WARNING

Do not use plastic buckets. If the cleaning

solution is not cool enough, the buckets will

melt; possibly causing you to be burned,

and causing cleaning solution to get on the

floor.

WARNING

Do not allow the cleaning solution to

overflow the buckets. Cleaning solution

will get on the floor, and if the solution is

not cool enough, you may be burned.

WARNING

Thoroughly clean and dry the floor if

cleaning solution is to spill. Liquid on the

floor can cause serious injury or loss of life.

7. Lift the kettle out of the fryer case, if you have not done so already.

8. Rinse the kettle thoroughly and dry it on the outside.

9. Install the kettle, tilt the control box assembly down, and install the conveyor assembly as before.

5. Lift the conveyor assembly out of the fryer case. Tilt the control box assembly back.

6. Remove the water from the kettle using one of these methods:

 If you have an optional Filter Flo

Siphon, remove its filter assembly. Then use the Filter Flo to siphon the cleaning solution into one or more large metal buckets. (See the instructions in Section

4.) When the cleaning solution has stopped draining, carefully carry the buckets to the sink and slowly pour the solution into the sink.

 Lift the kettle out of the fryer case,

carefully carry it to the sink, and slowly pour the cleaning solution into the sink.

 Using a small saucepan or a metal

WARNING

Do not use plastic buckets. If the water is

not cool enough, the buckets will melt;

possibly causing you to be burned, and

causing water to get on the floor.

Rinsing

1. Pour clean water into the kettle, up to the normal level of the shortening.

2. Connect the machine to the power source. Heat the water to 200

3. Run the conveyor for 5-10 minutes.

4. Turn off the heater and disconnect the machine from the power source. Allow the water to cool to 100

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Donut Robot Mark II-Gas OM MN-1017EN 11

F/93C.

F/38C.

Do not allow the water to overflow the

buckets. Water will get on the floor, and if

the water is not cool enough, you may be

WARNING

burned.

WARNING

Thoroughly clean and dry the floor if water

does spill. Water on the floor can cause

serious injury or loss of life.

7. Lift the kettle out of the fryer case, if you have not done so already.

8. Dry all parts thoroughly.

WARNING

All parts must be dried thoroughly.

Moisture causes hot shortening to spatter,

which may cause serious injury.

9. Assemble the Donut Robot as before.

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12 MN-1017EN Donut Robot Mark II-Gas OM

3 Maintenance

WARNING

To avoid being burned, electrocuted, or

otherwise injured, always unplug the

machine and allow it to cool down before

making adjustments, clearing obstructions,

lubricating, cleaning, or disassembling.

Taking Care of the Plunger, Hopper, and Cylinder

The plunger, hopper, and cylinder of your Donut Robot are precision instruments. If you take good care of them, they will perform well for years. Follow these guidelines:

 Clean these parts only in the manner

explained in this manual.

 Handle these parts with care. Avoid

dropping them on hard surfaces.

Lubricating

Daily

Before using the machine each day, apply ediblegrade mineral oil to the plunger connecting rod. The oil should penetrate the ball lock and the spring socket. See Figure 3-1.

 Do not force the machine if it becomes

jammed. To avoid damaging the plunger, disassemble the machine and remove any obstructions.

Figure 3-1. Lubricating the Connecting Rod.

Weekly

Apply a few drops of SAE 30 machine oil to the swing column where it contacts the swing column bracket.

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Donut Robot Mark II-Gas OM MN-1017EN 13

4 Related Products

This appendix contains information about the following products which you might use with your Donut Robot

 Feed Table  Roto Cooler  Icing Finishing Tree and Roto Cooler  Sugaring Tray and Roto Cooler  Filter Flo Siphon  Shortening Reserve Tank



FT-42 Feed Table

SPECIFICATIONS

Dimensions Shipping

Weight

L = 52”/132 cm

W = 19”/48 cm

H = 11 3/4”/

30 cm

73 lb/33.1 kg 115 V

Electrical Data Construction Standard

Equipment

Complete conveyor assembly, including drive system and controls. Does not include proofing cloths or proofing boards.

1 Phase

50 or 60 Hz

Stainless steel, nickel-plated mild steel, and aluminum alloys.

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14 MN-1017EN Donut Robot Mark II-Gas OM

Figure 4-1. FT-42 Feed Table.

The FT-42 Feed Table is designed to supply proofed yeast-raised donuts to the Donut Robot. It is meant to be used on a flat, stationary table or countertop, positioned end-to-end with the Donut Robot. The operator is expected to read and follow these instructions.

Installation

1. Unplug the cutter head power cord of your Donut Robot.

2. Release the plunger from the cutter head.

3. Unscrew and lift off the hopper assembly.

4. Lift off the cutter head and swing column assemblies.

5. Lift the outfeed end of the Feed Table and set the brace under the trip shelf over the edge of the kettle.

WARNING

To avoid injury, make sure that the Feed

Table is turned off before proceeding.

Operation

1. Test to make sure that the automatic timing for the Feed Table is working. To do this:

a. Turn on the Donut Robot’s conveyor

drive.

b. Turn on the Feed Table’s conveyor

drive.

The Feed Table should receive a signal

from the Donut Robot, move forward the distance needed to supply one pocket of donuts, and then stop until it receives the next signal.

2. Proof your donuts on the proofing cloths from the Feed Table.

3. Put a proofing board, with a proofing cloth on it, on the Feed Table.

4. Press the prime switch on the power head assembly. The hooks on the Feed Table will grab the proofing cloth off of the proofing board. Allow the cloth to advance to the front of the Feed Table.

5. Release the prime switch and turn on the

6. Plug the Feed Table power cord into the outlet on the end of the heater head.

7. Set the Donut Robot to cut one cut per pocket.

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Donut Robot Mark II-Gas OM MN-1017EN 15

main power. Remove the proofing board.

When the Feed Table is on, the Feed Table

automatically advances donuts when the Donut Robot is ready to accept them. After the donuts go into the fryer, the proofing cloths are carried underneath the Feed Table and fall onto the work surface.

6. Continue putting proofing cloths on the Feed Table.

CAUTION

To avoid damaging the machine, never use

force to assemble or operate the Feed

Table.

Maintenance and Cleaning

After Each Use

Use a soft, damp cloth for cleaning.

WARNING

To avoid electrocuting yourself or

damaging the machine, never allow any

liquid to enter the power head.

As Needed

If you ever need to adjust the tension of the conveyor chains, follow these steps:

1. Loosen the hex head bolts that hold the roller shaft at the outfeed end of the conveyor.

2. Pull the shaft until the chains reach the correct tension. The tension is correct when you can lift the chains about 1”/2.5 cm above the surface of the Feed Table. Each chain should have the same tension.

3. Tighten the hex head bolts that hold the roller shaft.

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16 MN-1017EN Donut Robot Mark II-Gas OM

Roto Cooler

SPECIFICATIONS

Dimensions Shipping

Weight

Dia.=24”/61 cm

16 lb/7.3 kg 120 V

H=6-5/8”/17 cm

Electrical Data Construction Standard

Equipment

1 Phase

Basket: High-density polyethylene. Base: Spun, polished,

Basket and turntable base with power cord and motor.

heavy-gauge

50 or 60 Hz

aluminum.

To use the Roto Cooler:

1. Place the Roto Cooler near the outfeed end of the Donut Robot so donuts will fall into it.

2. Connect the Roto Cooler power cord to the 120 V outlet on back of the Donut Robot’s heater head.

3. Turn on the Roto Cooler. It will rotate and receive donuts. Remove cooled donuts from the Roto Cooler as needed.

Figure 4-2. Roto Cooler.

The Roto Cooler is designed to catch and cool donuts as they drop from the outfeed end of the Donut Robot. It is meant to be used on a flat, stationary table or countertop. The operator is expected to read and follow these instructions.

FIGURE 4-3. ROTO COOLER MAIN ASSEMBLY.

4. When you are finished using the Roto Cooler, turn it off and unplug it.

WARNING

To avoid electrocuting yourself or

damaging the machine, never submerge the

base of the Roto Cooler.

5. Clean the Roto Cooler using soap and water and a non-abrasive cloth or scrubber.

On the following pages are a wiring diagram and a parts list for the Roto Cooler.

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Donut Robot Mark II-Gas OM MN-1017EN 17

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18 MN-1017EN Donut Robot Mark II-Gas OM

Icing Finishing Tree and Roto Cooler

SPECIFICATIONS

Dimensions Shipping

Weight

Dia.=24”/61 cm

H=32”/81 cm

28 lb/12.7 kg 120 V

Electrical Data Construction Standard

Equipment

Power turntable and four trays, three of which have dividers.

1 Phase

50 or 60 Hz

Trays: Heavy-gauge aluminum. Basket: High-density polyethylene. Base: Spun, polished, heavy-gauge aluminum.

To use the Roto Cooler and the Icing Finishing Tree:

1. Attach the Icing Finishing Tree to the Roto Cooler. Fill the metal trays with toppings.

2. Install and operate the Roto Cooler as explained in the previous section.

3. Decorate the donuts with the toppings in the trays.

Figure A-4. Icing Finishing Tree and Roto

Cooler.

The Roto Cooler is designed to catch and cool donuts as they drop from the outfeed end of the Donut Robot. It is meant to be used on a flat, stationary table or countertop.

The Icing Finishing Tree, which mounts on the Roto Cooler, is designed to hold toppings in which donuts can be dipped. The operator is expected to read and follow these instructions.

4. When you are finished using the Roto Cooler and the Icing Finishing Tree, turn off the Roto Cooler and unplug it.

WARNING

To avoid electrocuting yourself or

damaging the machine, never submerge the

base of the Roto Cooler.

5. Clean the trays of the Roto Cooler and the Icing Finishing Tree using soap and water and a non-abrasive cloth or scrubber.

On the following page is a parts illustration for the Icing Finishing Tree.

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Donut Robot Mark II-Gas OM MN-1017EN 19

FIGURE 4-5. ICING FINISHING TREE MAIN ASSEMBLY.

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20 MN-1017EN Donut Robot Mark II-Gas OM

Sugaring Tray and Roto Cooler

SPECIFICATIONS

Dimensions Shipping

Weight

Dia.=17-1/4”/

44 cm

H=6-5/8”/17 cm

16 lb/7.3 kg

Electrical Data Construction Standard

Equipment

120 V

1 Phase

50 or 60 Hz

Spun, polished, heavy-gauge aluminum.

To use the Sugaring Tray and Roto Cooler base:

1. Put sugar, powdered sugar, or cinnamonsugar in the tray.

2. Place the Sugaring Tray and Roto Cooler base near the outfeed end of the Donut Robot so donuts will fall into the tray.

3. Connect the Roto Cooler power cord to the 120 V outlet on back of the Donut Robot’s heater head.

4. Turn on the Roto Cooler base. The Sugaring Tray will rotate and receive donuts.

Power turntable with sugar tray.

5. Coat the donuts with the topping in the tray.

Figure 4-6. Sugaring Tray.

The Roto Cooler base makes the Sugaring Tray rotate. It is meant to be used on a flat, stationary table or countertop.

The Sugaring Tray, which mounts on the Roto Cooler base, is designed to catch donuts as they drop from the outfeed end of the Donut Robot, and to hold toppings in which donuts can be dipped. The operator is expected to read and follow these instructions.

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Donut Robot Mark II-Gas OM MN-1017EN 21

6. When you are finished using the Sugaring Tray, turn off and unplug the Roto Cooler base.

WARNING

To avoid electrocuting yourself or

damaging the machine, never submerge the

base of the Roto Cooler.

7. Clean the Sugaring Tray using soap and water and a non-abrasive cloth or scrubber.

Filter Flo Siphon

SPECIFICATIONS

Dimensions Shipping Weight Construction Standard Equipment

H=16”/41 cm

Dia.=6-1/4”/16

BULB DR42-0273

MOUNTING BRACKET

DR42-0274

3 lb/1.4 kg Siphon tube and valve: nickel-plated

steel. Handle: wood. Filter ring: powder-coated. Filters: flannel. Mounting brackets: aluminum alloy.

The Filter Flo Siphon is designed to drain and filter shortening from the kettle of the Donut Robot. The operator is expected to read and follow these instructions.

Installation

1. Let the shortening cool to 100F/38C.

Siphon assembly including valve, filter, filter ring, and clamp.

HANDLE SF100-0027

SIPHON TUBE DR42-0626

FILTER MOUNTING BRACKET DR42-0276

FILTER RING DR42-0275

WARNING

Hot shortening can cause serious burns.

Never touch hot shortening. Never wear

shorts while using the Filter Flo Siphon.

2. Place the mounting bracket, with the siphon

VALVE

DR42-0627

FILTER

DR42-0277

tube in it, on the lip of the kettle. You may place it on the infeed end of the kettle, or on the front side of the kettle. If you place it on the front side, you must disconnect the swing connecting rod from the throw arm and move it out of the way.

3. Position the opening of the siphon tube near the bottom of the kettle.

4. Tighten the thumb screw in the mounting bracket.

Figure 4-7. Filter Flo Siphon.

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22 MN-1017EN Donut Robot Mark II-Gas OM

5. Attach the filter assembly to the lower part of the siphon tube, as shown in Figure 4-7. To do this:

a. Slide the opening in the filter mounting

bracket around the siphon tube.

b. Adjust the filter mounting bracket

vertically to ensure that the filter does not touch the valve assembly.

c. Tighten the screw that holds the filter

mounting bracket to the siphon tube.

d. Tighten the screw that holds the filter

retaining ring to the filter mounting bracket.

WARNING

Make sure that both screws in the filter

assembly are tight. If they are not, the

filter assembly might slide off of the siphon

tube during operation, causing shortening

to splatter.

6. Place a five-gallon metal container under the filter.

Operation

1. Compress the bulb quickly and release it quickly. Do this only once. Shortening should flow into the container.

CAUTION

Do not compress the bulb more than once.

Doing so could allow hot shortening to get

into the bulb, damaging your equipment.

2. Watch the container as the shortening flows into it. If the shortening rises to within 2” (5 cm) of the top of the container, do the following:

a. With one hand, hold the siphon by the

handle. With the other hand, loosen the thumb screw that holds the siphon assembly to the mounting bracket on the lip of the kettle.

b. Slowly lift the siphon assembly so its

opening is above the shortening. Do not remove it from the mounting bracket.

c. Tighten the thumb screw.

WARNING

Do not use a plastic container. Hot

shortening could melt the container,

possibly burning you and getting

shortening on the floor. Shortening on the

floor could cause you to slip or fall,

resulting in injury or even death.

d. When the shortening stops flowing and

the valve closes, move the container out from under the filter.

e. Place another five-gallon metal container

under the filter.

f. With one hand, hold the siphon by the

handle. With the other hand, loosen the thumb screw that holds the siphon assembly to the mounting bracket on the lip of the kettle.

g. Slowly lower the siphon assembly so its

opening is near the bottom of the kettle. h. Tighten the thumb screw. i. Restart the siphon, as explained in step

j. Continue watching the container and

repeat the above procedure as needed.

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Donut Robot Mark II-Gas OM MN-1017EN 23

WARNING

If you allow shortening to overflow the

container, the shortening could burn you,

and it will get on the floor, possibly causing

slips, falls, injury, or even death. If

shortening does get on the floor, thoroughly

clean and dry the floor right away.

3. When the shortening stops flowing, tilt up the side of the kettle opposite the siphon. Place a wedge under the side of the kettle to hold it up. The remaining shortening will now flow toward the siphon.

4. Set aside the container of shortening.

5. Remove the filter assembly.

6. Place a different container under the valve assembly and start the siphon again. Drain the remaining shortening and discard it; it will be full of sediment.

Cleaning

1. Remove the siphon from the Donut Robot.

2. Squeeze the bulb several times to expel shortening from the siphon.

3. Wipe the siphon clean and hang it with the bulb side up so any remaining shortening will drain. Place a pan under the siphon to collect the shortening.

4. Rinse the filter bag and hang it to dry. You may launder it as needed.

WARNING

After washing, be sure the Filter Flo

Siphon is completely dry before using it

again. Moisture will cause hot shortening

to spatter, which may cause serious injury.

Belshaw Bros., Inc. www.belshaw.com  Phone 206-322-5474  Fax 206-322-5425

24 MN-1017EN Donut Robot Mark II-Gas OM

Shortening Reserve Tank

SPECIFICATIONS

Dimensions Shipping

Weight

L=11”/28 cm

W=5-1/2”/14 cm

D=4”/10 cm

The Shortening Reserve Tank is designed to supply melted shortening to the kettle of the Donut Robot. The operator is expected to read and follow these instructions.

To use the Shortening Reserve Tank:

1. Position the Shortening Reserve Tank on the conveyor side panels. Make sure that you do not position it above the donut turner.

4 lb/2 kg 4 lb/2 kg

Capacity Construction Standard

shortening

WARNING

Be careful if you put hot shortening into

the tank. Hot shortening can cause serious

burns.

Equipment

Nickel-plated steel tank and noncorrosive self-closing valve.

2. Place shortening in the tank.

3. Turn on the Donut Robot. The heat of the fryer will melt the shortening in the tank.

4. To supply shortening to the fryer, open the valve by pushing down on the valve assembly.

5. When you are done making donuts, drain the remaining shortening into the fryer.

6. When the shortening and equipment have cooled completely, remove the Shortening Reserve Tank and wash it.

Shortening reserve tank and valve assembly.

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Donut Robot Mark II-Gas OM MN-1017EN 25

5 Donut-Making Helps

Tips on Making Quality Cake Donuts

 Use the correct batter temperature.

In general, the correct batter temperature is

-80F/24-27C. Check the mix

75 manufacturer’s instructions, as the recommended temperature range may vary.

If the batter is too warm, the donuts will lack

volume and may “ring out” or be misshapen. If the batter is too cold, the donuts will stay under the shortening too long, fry too slowly, and crack open or ball up. They may also absorb excess shortening and lose volume.

 Use the correct floor time.

A floor time of 10 minutes between mixing

and cutting allows the baking powder to react with the water. This helps the donuts attain the proper volume the proper level of shortening penetration.

If the floor time exceeds 30 minutes, the mix

will gas off, the donuts will lose volume and shape and will absorb too much shortening.

If the shortening is too cold, the donuts will spread too rapidly, will form large rings, will tend to crack open, will be too light in appearance, and will absorb too much shortening.

 Maintain the proper shortening level. We

recommend a distance of 1 1/4” between the cutter and the shortening.

If the shortening is too deep, the donuts may

not turn over when they reach the turner, causing them to cook unevenly.

If the shortening is too shallow (too far

below the cutter), the donuts may not drop flat, may turn over while submerging and surfacing, and may become irregular, cracked, or rough-crusted.

 Ensure that the donuts absorb the right

amount of shortening.

Donuts should absorb 1-1/2 to 3 oz/42 to 85

g of shortening per dozen, depending on their weight. You can achieve proper absorption by following tips 1-3.

 If the donuts do not absorb enough

shortening, they will not keep well.

 Use the correct frying temperature.

The correct shortening temperature for

frying is 370

If the shortening is too hot, the donuts will

fry too quickly on the outside and will lose volume. The donuts may also become dense inside.

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26 MN-1017EN Donut Robot Mark II-Gas OM

-380F/188-193C.

If they absorb too much shortening, they

will lose volume and may become misshapen. If this happens, follow tips 1-3, mix the batter a little longer than usual, turn the donuts as soon as they become golden brown, and turn the donuts only once.

Temperature Conversion

To convert temperatures from Fahrenheit to Celsius, subtract 32 from by 1.8. For example, 212

To convert temperatures from Celsius to Fahrenheit, multiply result. For example, (100

F C F C

55 12.8 340 171.1 60 15.6 345 173.9 65 18.3 350 176.7 70 21.2 355 179.4 75 23.9 360 182.2

80 26.7 365 185.0 325 162.8 370 187.8 330 165.6 375 190.6 335 168.3 380 193.3

F and divide the result F-32/1.8 = 100C.

C by 1.8 and add 32 to the

C x 1.8) + 32 = 212F.

Ratios of Plunger Sizes to Donut Weights

The weights given are for donuts without icings or other toppings. They are provided for reference only, as weights vary according to the density of the batter.

Plunger Size Donut Weight per

Dozen

1” 5-8 oz/142-227 g 1 7/16” 10-17 oz/283-482 g 1 9/16” 14-21 oz/397-595 g

1 13/16” 19-23 oz/539-652 g

Calculating Correct Water Temperature

The following is an example of how to calculate the correct water temperature to use. You must use your own room temperature, dry mix temperature, desired batter temperature, and, if you are making yeast-raised donuts, estimated temperature increase during mixing.

Cake Donuts Yeast-Raised Donuts

Room temperature 72 22.2 72 22.2

Dry mix temperature +70

Desired batter temperature 75 23.9 80 26.7

Desired water temp. for cake donuts

Temperature increase during mixing (average: 30

Desired water temperature for yeast-raised donuts

Total

-Total

F

142 43.3 142 43.3

225 71.7 240 80.1

-142

83F

+21.1 +70 +21.1

x3 x3 x3

-43.3 -142 -43.3

Figure from above 98 36.8

C

28.4C

F/17C)

98 36.8

F



-30

68F

-17

C



19.8C

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Donut Robot Mark II-Gas OM MN-1017EN 27

Donut Robot



Mark II-Gas

Technical Supplement

Belshaw Bros., Inc.

814 44

Phone: 1-206-322-5474 • Fax: 1-206-322-5425

Email: service@belshaw.com • http://www.belshaw.com

Street NW, Suite 103

Auburn, WA 98001 USA

If you accept the machine from the shipping company, you are, in effect, saying that the machine is in good condition, and you must pay for the machine. Belshaw cannot pay for

IMPORTANT

Keep this manual for future reference.

To unpack the Donut Robot Mark II-Gas and transport it to the workstation requires two people:

1. Remove the foam and other packing

materials from the two boxes.

2. Carry the hopper, plunger, and swing

column to the work station.

3. Coil the cutter head power cord and carry the cutter head to the work station.

4. Carry the conveyor assembly the work station.

5. Move the fryer to the workstation.

EQUIPMENT RECORD

Please provide the information below when you correspond with us about your machine.

Purchased by ______________________________________________________________________

Installed by _______________________________________________________________________

Date of installation __________________________ Model number _________________________

Serial number ______________________________________________________________________

011808

MN-1018EN

Belshaw Bros., Inc.

814 44th Street NW, Suite 103

Auburn, WA 98001 USA

Phone: 206-322-5474 • Fax: 206-322-5425

Email: service@belshaw.com • http://www.belshaw.com

Contents

1 Installation 1

Unpacking the Fryer 1 Conforming to Codes 1 Initial Cleaning 3 Assembling the Fryer 3 Assembling the Cutter 4 Adjusting the Hopper 5 Leveling and Securing the Fryer 6 Connecting the Fryer to the Gas Supply 7 Moving the Fryer 7

2 Maintenance 8

Checking the Thermostat 8

3 Troubleshooting 9

Mark II Gas 10 FT42 Feed Table 19

4 Electrical Components 21

Continuity Testing 21 Robertshaw Thermostats 25

5 Appendix 27

Parts List Drawing Insert Page Insert

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Donut Robot Mark II-Gas TS MN-1018EN iii

Preface

 120 volts, 1 phase, 50/60 hertz

The Mark II-Gas is designed to be used on a flat, stationary table or countertop, with the operator standing opposite the control box and flue stack of the machine. The operator must work safely at all times and read this manual and follow its instructions and warnings.

Study the instructions and warnings in this manual carefully. A thorough understanding of how to install, maintain, and safely operate the Donut Robot Mark II-Gas will prevent production delays and injuries.

To use the Mark II-Gas safely, heed the following warnings and all other warnings that appear in this manual:

 Make sure the machine is secured to the work

surface. Doing so will prevent the machine from moving or falling, which could cause serious injury.

 Never let water and hot shortening come in

contact with each other. Moisture causes hot shortening to spatter, which may cause serious burns.

 Do not overfill the kettle with shortening. If

shortening overflows the kettle, it could

cause serious burns or could cause someone to slip on the floor and be seriously injured.

 To avoid electrocution or other injury,

unplug the machine before attempting any adjustment, repair, disassembly, or cleaning.

 Hot shortening can cause serious burns.

Make sure that the system and the shortening are cool before attempting any adjustment, repair, disassembly, or cleaning.

 To avoid damaging the machine, never use

force to assemble, disassemble, operate, clean, or maintain it.

 Be careful never to get shortening, water, or

other materials on the floor. If anything does get spilled on the floor, mop it up immediately. Materials on the floor can cause people to slip or fall, resulting in serious injury or loss of life.

 To prevent unintentional startup and possible

fire, unplug the machine if there is a local power outage. When the power is restored, it is safe to plug the machine in again.

 To avoid fire and personal injury, always

shut the machine down completely and wait at least five minutes before igniting the pilot again.

 To avoid electrocution, make sure all

electrical cords are not frayed or cracked and they do not pass through any water or shortening.

 Make sure that all electrical cords are routed

so that no one will trip over them.

 To avoid serious injury or death, always keep

the fryer area free and clear from combustible materials.

Belshaw Bros., Inc.  www.belshaw.com  Phone 206-322-5474  Fax 206-322-5425

iv MN-1018EN Donut Robot Mark II-Gas TS

1 Installation

Unpacking the Fryer

Before you unpack and install the fryer, you should first select a workstation. The work station should allow at least 2”/5 cm clearance between the machine and all construction, whether combustible or noncombustible. To provide for proper operation and servicing, you should allow 2 ft/0.6 m clearance at the outfeed end of the fryer.

In a prominent location, post instructions to be followed in the event the user smells gas. Obtain this information by consulting your local gas supplier.

FOR YOUR SAFETY

Do not store or use gasoline or other

flammable vapors or liquids in the vicinity

of this or any other appliance.

Installation Code (CAN/CGA-B149.2), including:

 The fryer and its individual shutoff valve

must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.45 kPa).

 The fryer must be isolated from the gas

supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.45 kPa).

The fryer, when installed, must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70, or with the Canadian Electrical Code, CSA C22.1, as applicable.

WARNING

Electrical Grounding Instructions

Improper installation, adjustment,

alteration, service or maintenance can

cause property damage, injury or death.

Read the installation, operating and

maintenance instructions thoroughly

before installing or servicing this

equipment.

This appliance is equipped with a three-

prong (grounding) plug for your protection

against shock hazard and should be

plugged directly into a properly grounded

three-prong receptacle. Do not cut or

remove the grounding prong from this

plug.

Conforming to Codes

The installation of this fryer must conform with local codes, or in the absence of local codes, with the National Fuel Gas Code (ANSI Z223.1-

1988), with the Natural Gas Installation Code (CAN/CGA-B149.1), or with the Propane

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Donut Robot Mark II-Gas TS MN-1018EN 1

After unpacking, you should also be familiar with the major parts of your Donut Robot

Mark



II-Gas. To help familiarize you with these parts, please study the photograph below.

cutter head

plunger

hopper

flue stack control box

swing column swing connecting rod fryer conveyor

Figure 1-1. Donut Robot Mark II-Gas, Front View.

To unpack the Donut Robot

Mark II-Gas and



transport it to the workstation, see the second page of this manual.

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2 MN-1018EN Donut Robot Mark II-Gas TS

Initial Cleaning

Thoroughly clean your Donut Robot Mark II-Gas before using it. Refer to Section 3, “Cleaning,” for cleaning instructions.

WARNING

To avoid electrocuting yourself or damaging the machine, never allow water, steam, cleaning solution, or other liquid to

enter the cutter head or the control box.

WARNING

Never let water and hot shortening come in

contact with each other. Moisture causes hot shortening to spatter, which may cause serious injury. Prior to use, make sure the

kettle and any other parts you have washed

are dry.

6. Install the conveyor assembly as follows: a. Hold the conveyor at the angle shown in

Figure 1-2 and slide the conveyor drive coupling over the main drive shaft coupling. The conveyor coupling has a notch in it. Turn the conveyor coupling until the head of the socket head screw in the drive coupling can slide into this notch. (See Figure 1-2.)

b. Lower the front side of the conveyor

assembly so the hole in the conveyor flange fits over the locating pin on the lip of the kettle.

Assembling the Fryer

1. Place the fryer case on a flat, stationary surface.

2. Screw the fryer’s legs in as far as they will go.

3. Set the kettle into the fryer case. The end of the kettle that has the locating pin must be placed at the outfeed end of the fryer case. The lip of the kettle should fit securely over the edge of the case.

4. Install the control box as follows: a. Align the holes in the control box

mounting flanges with the holes in the

mounting brackets. b. Slide the bolts through the holes. c. Tighten the nuts onto the bolts.

5. Lower the control box assembly into position so the thermostat bulb bracket rests on or very near the bottom of the kettle.

Figure 1-2. Joining the Couplings.

If you are preparing to make yeast-raised donuts, skip steps 7 and 8 and proceed to step 9.

7. Insert the swing column into the swing column mounting bracket. Make sure the plastic spacer washer is on the swing column between the set collar and the swing column mounting bracket. See Figure 1-3.

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Donut Robot Mark II-Gas TS MN-1018EN 3

9. Be sure your power source matches the specifications on the machine. Connect the machine to the power source.

10. Turn on the conveyor only and check to see that it operates smoothly. The power switch for the conveyor drive is on the control box.

Assembling the Cutter

Read this section only if you are preparing to make cake donuts.

1. Set the cutter head assembly onto the swing column. See Figure 1-5.

Figure 1-3. Inserting the Swing Column.

8. Connect the swing connecting rod to the throw arm of the swing column. A locating pin on the swing connecting rod rests in a hole in the throw arm. See Figure 1-4.

Figure 1-5. Mounting the Cutter Head

Assembly.

2. Mount the hopper by sliding the two mounting studs on the hopper arch into the notches on the bearing strut. Secure the hopper with the thumb nuts. See Figure 1-6.

Figure 1-4. Connecting the Swing

Connecting Rod.

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4 MN-1018EN Donut Robot Mark II-Gas TS

Figure 1-6. Mounting the Hopper.

3. Install the plunger as follows: a. Pull the plunger connecting-rod up and

out of the way.

b. Put the narrow part of the plunger’s

center rod through the slot in the center of the hopper arch.

c. Lower the plunger until the wider part at

the top of the center rod enters the round opening in the hopper arch and the plunger’s piston just enters the hopper cylinder.

d. Lower the connecting rod and insert the

pin into the hole near the top of the plunger center rod. See Figure 1-7.

Figure 1-7. Installing the Plunger.

4. Plug the power cord from the cutter head assembly into the outlet on the back of the control box.

5. Test the cutter head to ensure that it is operating properly. Turn it on using the prime switch on the cutter head. The cutter should run continuously. Turn off the cutter.

Adjusting the Hopper

Read this section only if you are preparing to make cake donuts.

WARNING

To avoid injury, always disconnect the

machine from the power source before

making adjustments.

1. The bottom of the hopper should be 1”/

2.5 cm above the flight bars. To set the height of the hopper:

a. Hold the cutter and the hopper from

below.

b. Loosen the set screw in the lower set

collar on the swing column.

c. Raise or lower the swing column as

needed.

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Donut Robot Mark II-Gas TS MN-1018EN 5

d. Tighten the set screw. See Figure 1-8.

Figure 1-8. Adjusting the Height of the

Hopper.

2. As the hopper swings back and forth over the kettle, the hopper cylinder should stop the same distance away from either side of the kettle at each end of the swing.

To check the swing of the hopper, turn on

the conveyor. If you need to center the swing of the hopper, follow these steps:

a. Turn off the conveyor. b. Loosen the set screws in the upper set

collar. c. Swivel the bearing strut as needed. d. Tighten the set screws. See Figure 1-9.

Figure 1-9. Adjusting the Swing of the

Hopper.

e. Double-check the swing of the hopper

by turning on the conveyor. Then turn off the conveyor.

Leveling and Securing the Fryer

Check to see if the fryer is level. If it is not, adjust the heights of the legs. Be sure that all six legs rest on the work surface when the fryer is level.

The fryer must be restrained to prevent it from tipping over and splashing hot liquid on the operator. Therefore, you must bolt the fryer to the work surface as follows:

1. There are brackets on the ends of the fryer case. Each has a hole in it. Mark the locations of the holes on the work surface.

2. Drill holes through the work surface.

3. Insert bolts through the holes.

4. Tighten nuts onto the bolts to ensure that the Donut Robot will not move.

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6 MN-1018EN Donut Robot Mark II-Gas TS

Connecting the Fryer to the Gas Supply

1. Ask your local gas company to advise you on the size of pipe and gas meter you should use.

2. Connect the fryer to the building’s gas supply.

3. Seal all threaded joints between gas pipes with pipe joint compound. You must use a compound that resists the action of liquefied petroleum (LP) gases.

4. Bleed the gas lines of all air.

5. Check all gas connections and fittings for leaks using a gas leak detector, a soap solution, or a similar substance. When such a substance is applied to connections and fittings, bubbles indicate gas leaks.

7. To avoid dropping the machine or getting shortening on the floor, wipe excess shortening off of the fryer and the conveyor.

WARNING

Thoroughly clean and dry the floor if

shortening is spilled. Materials on the floor

can cause people to slip or fall, resulting in

serious injury or loss of life.

8. Set aside the conveyor.

9. Remove the nuts and bolts that hold the control box in place. Remove the control box from the fryer.

10. To prevent tripping, coil the power cord. Move the control box to the new work station.

11. Move the fryer to its new location.

Moving the Fryer

If you ever want to move the fryer to a different workstation, follow this procedure:

1. Turn off the machine and disconnect it from the power source. Unplug the cutter head power cord.

2. Turn off the gas supply. Disconnect the machine from the gas supply.

3. Allow the machine and the shortening to cool.

WARNING

Do not touch hot shortening. It can cause

serious burns.

4. Remove and set aside the plunger, the hopper, and the cutter head, in that order.

12. Install the control box.

13. Move and install the conveyor. 14 Move and install the swing column.

Connect the swing connecting rod.

15. To prevent tripping, coil the cutter head power cord. Move and install the cutter head.

16. Move and install the hopper and the plunger.

17. Level and secure the fryer.

18. Connect the fryer to the building’s gas supply, and seal all pipe joints with joint compound.

5. Disconnect the swing connecting rod.

6. Remove the shortening from the fryer as explained in “Removing the Shortening” in Section 2 of the Operator's Manual.

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Donut Robot Mark II-Gas TS MN-1018EN 7

2 Maintenance

Checking the Thermostat

If the quality of your product decreases, check the accuracy of the thermostat. Heat some shortening in the fryer, measure the temperature of the shortening using a thermometer you know to be accurate, and compare this reading to the thermostat setting. It is important that you put the thermometer in the top 1”/2.5 cm or so of shortening, because this is where the donuts fry, and this is where the temperature should be consistent. If you need to calibrate the thermostat, consult Section 4, “Electrical Components.”

If you ever want to test the continuity of the thermostat or any of the switches on your Donut Robot, refer to Section 4, “Electrical Components.”

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8 MN-1018EN Donut Robot Mark II-Gas TS

3 Troubleshooting

This section is designed as an aid in troubleshooting, not as a substitute for a qualified technician. You may encounter a problem with your Donut Robot that is not covered in this section, or you may try the remedies suggested here and find that they do not correct the problem. In either case, feel free to call Belshaw Bros. at (206)322-5474. One of our customer support representatives will be happy to help you.

CAUTION

If you perform repairs yourself or have

them performed by anyone other than

Belshaw Bros. or a service technician

authorized by Belshaw Bros., you do so at

your own risk.

If your Donut Robot becomes badly worn or seriously out of adjustment, send it to our factory for complete rebuild and repair service. Return your machine, freight prepaid, with your instructions for service, your phone number, and the name of the person for us to contact when we have made a cost estimate. In most cases, the machine can be shipped back, freight collect, within five days.

Ship machines in need of servicing to: Belshaw Bros., Inc.

814 44 Auburn, WA 98001 USA

street NW, Suite 103

 The serial number of the machine.  The voltage and hertz of the machine.  The part number.  The part description, including the size,

if applicable.

 The quantity desired.

Following is a troubleshooting chart to help you identify and solve some basic problems. See also:

 Section 5 in the Operator's Manual,

“Donut-Making Helps,” for additional information regarding baking mixes, temperature, and fry time.

 The wiring diagram in the back of this

manual.

WARNING

To avoid being burned, electrocuted, or

otherwise injured, unplug the machine and

allow it to cool before disassembling,

repairing, or wiring.

If you need a replacement part, use the parts lists and assembly drawings in the Appendix to determine the part number and description, or call Belshaw for help. When you order the part, please specify the following:

 The model name of the machine.

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Donut Robot Mark II-Gas TS MN-1018EN 9

Mark II-Gas

THE DONUTS BALL OR BLISTER.

Possible Causes What To Do

The dough is too cold. See Section 5 of the Operator's Manual, “Donut-

Making Helps.” The shortening is too hot. Decrease the temperature setting. The dough is over mixed. Review the mixing procedure. The donuts are too large. Adjust the dial on the cutter head to produce smaller

donuts. The shortening is old or contaminated.

Replace the bad shortening with fresh shortening.

To avoid being burned, turn off the machine and

allow the shortening to cool.

WARNING

THE DONUTS ARE OVERCOOKED.

Possible Causes What To Do

The shortening is too hot. Decrease the temperature setting. The temperature

setting should never exceed 375F/191C. The conveyor is moving too slowly. Increase the speed of the conveyor. The thermostat reads inaccurately. Calibrate the thermostat.

THE DONUTS ARE UNDERCOOKED.

Possible Causes What To Do

The shortening is not hot enough. Increase the temperature setting. The conveyor is moving too quickly. Decrease the speed of the conveyor. The dough is too cold. See Section 5 of the Operator's Manual, “Donut-

Making Helps.” The dough has not had enough floor time. See Section 5 of the Operator's Manual, “Donut-

Making Helps.” The thermostat reads inaccurately. Calibrate the thermostat.

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10 MN-1018EN Donut Robot Mark II-Gas TS

THE DONUTS ARE SHAPED IMPERFECTLY.

Possible Causes What To Do

The shortening level is too low. Add shortening to reach the proper level.

The hopper is too far above the shortening. Lower the hopper to 1”/2.5 cm above the shortening. The drop plate is out of position. Reposition the drop plate. The tip of the cylinder is dirty.

Clean the cylinder. The tip of the cylinder is nicked. Replace the hopper. The size-selection dial is not tightened. Tighten the thumb nut. The dough is over mixed. Review the mixing procedure.

To avoid being burned or otherwise injured, before doing either of the following, turn off the machine and allow the shortening to cool.

To avoid injury, turn off the machine and remove the hopper.

WARNING

THE CUTTER SWING COLUMN CHATTERS.

Possible Causes What To Do

The nylon thrust washer is missing. Install the nylon thrust washer between the swing

There is not enough lubrication between the swing column and the swing column mounting bracket.

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Donut Robot Mark II-Gas TS MN-1018EN 11

To avoid injury, before doing either of the following, turn off the machine.

column bracket and the set collar. Lubricate the upper and lower legs of the bracket

with SAE 30 machine oil.

WARNING

THE CONVEYOR BITES THE DONUTS.

Possible Causes What To Do

The donuts are not cooking enough. See “The donuts are undercooked” above. The shortening level is too low. Add shortening to reach the proper level.

The turner is bent or packed with cooked food particles.

The cam weight is sticking due to the accumulation of varnish.

The fryer is not level. Level the fryer.

Before doing any of the following, turn off the

machine and allow the shortening to cool.

Straighten and/or clean the turner.

Clean to remove the cooked-on varnish.

THE CUTTER OPERATES CONTINUOUSLY.

Possible Causes What To Do

One of the microswitches is defective. (There are three microswitches in the conveyor drive assembly and one microswitch in the cutter head.)

To avoid being burned, electrocuted, or otherwise

injured, before doing any of the following, turn

off the machine, allow the shortening to cool, and

disconnect the machine from the power source.

For help in testing the microswitches, refer to

Section 4, “Electrical Components.” Replace any

defective microswitches.

WARNING

Something is interfering with the nylon brake dog in the cutter head.

The brake spring in the cutter head is weak or broken.

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12 MN-1018EN Donut Robot Mark II-Gas TS

Clear away the cause of the interference.

Replace the spring.

THE DONUTS DROP AT THE WRONG TIME.

Possible Cause What To Do

The hopper swing is adjusted incorrectly.

Adjust the hopper swing. See “Adjusting the

To avoid injury, turn off the machine.

Hopper” in Section 1, “Installation.”

WARNING

THE CONVEYOR IS JAMMED.

Possible Causes What To Do

The hopper is too low and the cutter or the hopper is catching on the flight bars.

Cooked food particles are wedged between a chain opening and a sprocket tooth.

The turner slot is packed with cooked food particles.

To avoid being burned or otherwise injured, before doing any of the following, turn off the machine and allow the shortening to cool.

Raise the hopper to 1”/2.5 cm above the flight bars.

Clean to remove the food particles. Clean the Donut Robot regularly and thoroughly.

Clean to remove the food particles.

WARNING

The drop plate is out of position and is interfering with the conveyor.

Something is interfering with the free movement of the turner cam and cam weight.

The heating element is bent and is interfering with the turner.

The turner is out of position and is catching on a flight bar below.

Reposition the drop plate.

Remove the obstruction.

Straighten the heating element.

Lift and move the outfeed end of the conveyor to disengage the conveyor coupling from the conveyor drive shaft. Turn the conveyor back 2-3 pockets. The turner will return to the correct position.

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Donut Robot Mark II-Gas TS MN-1018EN 13

THE CONVEYOR IS JAMMED CONTINUED.

Possible Causes What To Do

The conveyor drive shaft and the drive motor shaft are out of alignment.

Remove the cover of the drive assembly. Loosen the

four mounting spacers so the drive assembly can be

moved. Align the motor shaft with the conveyor

shaft. When they are aligned, tighten the mounting

spacers. Replace the cover.

THE MOTOR OVERHEATS.

Possible Causes What To Do

The power requirements of the machine do not match the power source.

The motor is binding. Repair or replace the motor. The motor is defective. Repair or replace the motor.

Supply the correct power as specified on the data

plate.

WARNING

To avoid being burned, electrocuted, or otherwise

injured, before doing the following, turn off the

machine, allow the shortening to cool, and

disconnect the machine from the power source.

THE CUTTER CUTS DOUBLE WHEN YOU HAVE SELECTED ONE CUT PER POCKET.

Possible Causes What To Do

The nylon brake dog is binding on the cutter brake motor.

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14 MN-1018EN Donut Robot Mark II-Gas TS

To avoid being burned, electrocuted, or otherwise

injured, before doing any of the following, turn off

the machine, allow the shortening to cool, and

disconnect the machine from the power source.

Loosen the brake dog. (brake dog is a flat metal gold

color piece under motor that moves the white plastic

lever) If the spring is missing or weak, replace it. If

the brake dog is worn, replace it.

WARNING

THE CUTTER CUTS DOUBLE WHEN YOU HAVE SELECTED ONE CUT PER POCKET CONTINUED.

Possible Causes What To Do

An internal wire is interfering with the nylon brake dog.

The arm on the cutter head microswitch is bent. Bend the arm back into position or replace the

The wires on the cutter head microswitch are reversed.

Move the wire.

microswitch. Make the correct connections.

THE CUTTER WILL NOT OPERATE, BUT THE CONVEYOR RUNS.

Possible Causes What To Do

The cutter head power cord is not plugged in to the outlet on the back of the control box.

The set screws in the cutter head cam are loose. Tighten the set screws.

Connect the cutter head power cord to the correct outlet.

WARNING

To avoid being burned, electrocuted, or otherwise injured, before doing any of the following, turn off the machine, allow the shortening to cool, and disconnect the machine from the power source.

The cutter head power cord is broken. Repair or replace the cutter head power cord. The cutter motor is defective. Replace the cutter motor. One of the microswitches is defective. (There are

three microswitches in the conveyor drive assy. and one microswitch in the cutter head.)

The cutter head power switch is defective. Replace the cutter head power switch. The circuit breaker on the back of the heater head

is defective. The cutter head assy. wiring harness is not

connected.

The cuts-per-pocket switch is defective. Replace the cuts-per-pocket switch.

For help in testing the microswitches, refer to Section 4, “Electrical Components.” Replace any defective microswitches.

Replace the circuit breaker.

Check the connection between the pin housing in the conveyor drive assembly and the socket housing in the heater head. Also, make sure that the pins are securely seated in the pin housing.

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Donut Robot Mark II-Gas TS MN-1018EN 15

THE PILOT WILL NOT IGNITE, AND THE CONVEYOR WILL NOT RUN.

Possible Causes What To Do

The power cord is not plugged in, or the outlet has no power.

The gas is not turned on or the connection to gas source is loose.

The power cord is defective. Replace the power cord. The ignite sensor is dirty or broken Clean sensor and tighten if necessary or replace

The system safety lockouts. Please follow these steps:

Connect the machine to a good power source.

Turn on gas. Reconnect to gas source.

WARNING

To avoid being burned, electrocuted, or otherwise

injured, before doing any of the following, turn off

the machine, allow the shortening to cool, and

disconnect the machine from the power source.

sensor if broken.

1. Close the first main valve.

2. Close the first main pilot valve gas control.

3. Set the fryer thermostat below 200F/93C.

4. Move the on/off switch to OFF.

5. Wait at least five minutes before trying again to light the pilot.

Failure to wait at least five minutes for gas to dissipate could result in a fire or an explosion when the pilot is lit again.

WARNING

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16 MN-1018EN Donut Robot Mark II-Gas TS

THE PILOT WILL NOT IGNITE, BUT THE CONVEYOR RUNS.

Possible Causes What To Do

The gas is not turned on or the connection to gas source is loose.

The high temperature limit control switch has been tripped.

The thermostat has been calibrated incorrectly. Recalibrate the thermostat.

The high temperature limit control is defective. Replace the high temperature limit control. The thermostat is defective. Replace the thermostat.

Turn on gas. Reconnect to gas source.

Push the red reset button on the back of the control box.

WARNING

To avoid being burned, electrocuted, or otherwise injured, before doing any of the following, turn off the machine, allow the shortening to cool, and disconnect the machine from the power source.

THE GAS SYSTEM HEATS, BUT THE CONVEYOR WILL NOT RUN.

Possible Causes What To Do

The input voltage is incorrect. Supply the correct power as specified on the data

plate.

There is a short circuit. Find it and repair it. The wiring harness in the conveyor drive

assembly is not connected.

The conveyor drive power switch is defective. Replace the switch. The nylon brake dog is binding on the conveyor

brake motor. The brake motor is defective. Replace the brake motor. An internal wire is interfering with the nylon

brake dog.

To avoid being burned, electrocuted, or otherwise injured, before doing any of the following, turn off the machine, allow the shortening to cool, and disconnect the machine from the power source.

Check the connection of the pin connector from the conveyor drive assembly to the socket connector in the heater head enclosure. Make sure the pins in the pin housing are securely seated in the housing.

If the brake dog is worn, replace it. If it is too tight, loosen it. If the spring is weak or missing, replace it.

Move the wire.

WARNING

THE GAS SYSTEM HEATS, BUT THE CONVEYOR WILL NOT RUN

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Donut Robot Mark II-Gas TS MN-1018EN 17

CONTINUED.

A fan blade is caught on a wire. Move the wire. The conveyor is jammed. Clear the obstruction. The couplings are not engaged. Engage the couplings. The conveyor drive coupling is slipping. Tighten the two set screws.

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18 MN-1018EN Donut Robot Mark II-Gas TS

FT42 Feed Table

THE CONVEYOR CHAINS DO NOT ADVANCE WHEN THE MAIN POWER IS ON OR WHEN THE PRIME SWITCH IS PRESSED, AND THE PILOT LIGHT DOES NOT COME ON.

Possible Causes What To Do

The power cord is not connected. Plug in the power cord.

The circuit breaker for the gear box outlet on the Donut Robot’s heater head is tripped.

The black or white wire in the power cord is broken or poorly connected.

The fuse on the Feed Table is blown. Replace the fuse.

The fuse for the Donut Robot’s conveyor is blown.

Push the white reset button near the outlet.

WARNING

To avoid electric shock or other injury, before doing any of the following, unplug the machine.

Repair the cord and/or make the proper connection.

Replace the fuse.

THE CONVEYOR CHAINS DO NOT ADVANCE WHEN THE MAIN POWER IS ON, BUT THEY DO ADVANCE WHEN THE PRIME SWITCH IS PRESSED.

Possible Causes What To Do

The red wire in the power cord is broken or poorly connected.

The microswitch in the power head is defective. Replace the microswitch.

The microswitch in the Donut Robot’s signal circuit is defective.

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Donut Robot Mark II-Gas TS MN-1018EN 19

To avoid electric shock or other injury, before doing any of the following, unplug the machine.

Repair the cord and/or make the proper connection.

Replace the microswitch.

WARNING

THE CONVEYOR CHAINS DO NOT ADVANCE AT ALL, DO NOT ADVANCE FAR ENOUGH, OR DO NOT ADVANCE THE SAME DISTANCE DURING EACH CYCLE, BUT THE PILOT LIGHT DOES COME ON.

Possible Cause What To Do

The cam in the power head is loose. Tighten the cam set screw.

To avoid electric shock or other injury, before doing the following, unplug the machine.

WARNING

THE CONVEYOR CHAINS ADVANCE CONTINUOUSLY WHEN THE MAIN POWER IS ON.

Possible Causes What To Do

The brake is defective. Repair or replace the brake.

The cam in the power head is loose. Tighten the cam set screw.

To avoid electric shock or other injury, before doing any of the following, unplug the machine.

WARNING

The microswitch in the power head is defective. Replace the microswitch.

The microswitch in the Donut Robot’s signal circuit is defective.

Replace the microswitch.

TWO ROWS OF DONUTS ARE ADVANCED DURING EACH CYCLE.

Possible Causes What To Do

The brake is defective. Repair or replace the brake.

The cam in the power head is loose. Tighten the cam set screw.

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20 MN-1018EN Donut Robot Mark II-Gas TS

To avoid electric shock or other injury, before doing either of the following, unplug the machine.

WARNING

4 Electrical Components

This appendix explains how to test the continuity of electrical components in the Donut Robot Mark II-Gas. These include the toggle switches, the microswitches, and the thermostat.

The appendix also contains a document by the Robertshaw Controls Company, the maker of the thermostat we use in the Donut Robot Mark II-Gas. It explains how to check, adjust, and recalibrate the thermostat.

switch terminals toggle switch

Continuity Testing

To test the continuity of a toggle switch:

WARNING

To avoid the possibility of electric shock,

disconnect the machine from the power

source before testing.

1. Disconnect the machine from the power source.

2. Disconnect the terminal wires from the switch.

3. Obtain a continuity tester or a volt-ohm meter. If neither of these instruments is available, make a continuity tester using a battery and a bulb. See Figure 4-1.

4. Connect the wires of the continuity tester to the switch terminals, as shown in Figure 4-1, and test the switch in the ON and OFF positions. The switch should show continuity only when in the ON position.

battery _

Figure 4-1. Toggle Switch Continuity Test.

To test the continuity of a microswitch:

WARNING

To avoid the possibility of electric shock,

disconnect the machine from the power

source before testing.

1. Disconnect the machine from the power supply.

2. Disconnect the terminal wires from the switch.

3. Obtain a continuity tester or a volt-ohm meter. If neither of these instruments is

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Donut Robot Mark II-Gas TS MN-1018EN 21

available, make a continuity tester using a battery and a bulb. See Figure 4-2.

4. Connect one wire of the continuity tester to the microswitch’s common (COM) terminal and the other wire to the normally open (NO) terminal, as shown in Figure 4-2. The switch should show continuity only when the microswitch actuator arm is depressed.

5. To test the normally closed (NC) terminal, move the wire from the normally open (NO) terminal to the normally closed terminal. Now the switch should show continuity only when the actuator arm is not depressed.

switch terminals

NC NO

COM

microswitch

To test the continuity of the thermostat:

WARNING

To avoid the possibility of electric shock,

disconnect the machine from the power

source before testing.

1. Disconnect the machine from the power supply.

2. Disconnect the terminal wires from the thermostat.

3. Connect the continuity tester across the B terminals indicated in Figure 4-3. This set of contacts should be closed whenever the thermostat is on. To test, start with the thermostat in the OFF position. Then turn the thermostat up until you hear a distinct click (at about the 175F/79C setting). At this time, there should be continuity across the B terminals.

battery



Figure 4-2. Microswitch Continuity Test.

4. Connect the continuity tester across the A terminals indicated in Figure 4-3. Start with the thermostat in the OFF position and turn the thermostat up until you hear a distinct click. If there is no continuity (the indicator or light does not come on), proceed to step 5.

5. With the continuity tester still connected, turn the thermostat knob to OFF and remove the knob. There is an adjusting screw in the center of the knob stem. Turn it counterclockwise until there is continuity. If there is no continuity (the indicator or light does not come on), then the thermostat is defective. If there is continuity, proceed to step 6.

Belshaw Bros., Inc.  www.belshaw.com  Phone 206-322-5474  Fax 206-322-5425

22 MN-1018EN Donut Robot Mark II-Gas TS

6. Immerse the thermostat sensing bulb in a pan of boiling water and set the thermostat at about 212F/100C. The continuity tester’s indicator or light should go off. If the indicator or light does not go off, increase the temperature setting of the thermostat until it does. Then recalibrate the thermostat according to the manufacturer’s instructions. If the indicator or light will not go off at any setting or recalibration, then the thermostat is defective.

“B” terminals

“A” terminals

Figure 4-3. Thermostat Terminals.

Belshaw Bros., Inc.  www.belshaw.com  Phone 206-322-5474  Fax 206-322-5425

Donut Robot Mark II-Gas TS MN-1018EN 23