Pitco DD24RUFM Service Manual

Technical Service and Exploded Parts

For Gas Fryers

Covering Models

DD-24RUFM

ENGLISH

FRANCAIS

Pitco Frialator, Inc., P.O. Box 501, Jct I-89 & I-93 Concord, NH 03302-0501 • 509 Route 3A, Bow, NH 03304

L22-234 Rev 0 (03/03)

(800) 258-3708 • (603) 225-6684 • FAX (603) 225-8497

www.pitco.com

THIS MANUAL MUST BE RETAINED FOR FUTURE REFERENCE

FOR YOUR SAFETY DO NOT store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance.

WARNING Improper installation, 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.

TO THE PURCHASER Post in a prominent location the instructions to be followed in the event that an operator smells gas. Obtain this information from your local gas supplier.

WARNING The fryer is equipped with an oil proof, electrical supply cord with a three prong safety plug. This is to protect operators from electrical shock hazard in the event of an equipment malfunction. DO NOT cut or remove the grounding (third) prong from this plug.

WARNING There is an open flame inside the fryer. The unit may get hot enough to set near by materials on fire. Keep the area around the fryer free from combustibles.

WARNING DO NOT supply the fryer with a gas that is not indicated on the data plate. If you need to convert the fryer to another type of fuel, contact your dealer.

WARNING

DO NOT use an open flame to check for gas leaks!

WARNING Wait 5 minutes before attempting to relight the pilot to allow for any gas in the fryer to dissipate.

WARNING Never melt blocks of shortening on top of the burner tubes. This will cause a fire, and void your warranty.

WARNING Water and shortening DO NOT mix. Keep liquids away from hot shortening. Dropping liquid frozen food into the hot shortening will cause violent boiling.

WARNING Ensure that the fryer can get enough air to keep the flame burning correctly. If the flame is starved for air, it can give off a dangerous carbon Monoxide gas. Carbon monoxide is a clear odorless gas that can cause suffocation.

WARNING A cooker equipped with casters and a flexible gas line, must be connected to the gas supply with a quick disconnect device. This quick disconnect must comply with ANSI Z24.41. To limit the movement of the cooker without depending on the connector or quick disconnect, a restraining cable must also be installed.

The power supply must be disconnected before servicing or cleaning the appliance

Do not attempt to move the appliance when the unit is at operating temperature.

Hot oil will cause serious personal injury if it comes in contact with you skin

L22-234 Rev 0 (03/03)

WARNING

L22-234 Rev 0 (03/03)

Pitco Frialator DD 24R-UFM Doughnut Fryer

Troubleshooting

TROUBLESHOOTING

Figure 24 shows a block diagram for a unit with standing pilot ignition. Figures 26 and 27 are schematics for this type of fryer. On a fryer with standing pilot ignition, the pilot is lit by hand. The flow of gas is controlled by a valve called a “Unitrol” (V1). The Unitrol actually includes two separate valves - one for the pilot flame, and another valve for the main burners. When you turn the Unitrol handle to the Pilot position and push it in, the valve for the pilot burner opens. This allows you to light the pilot flame.

A device called a “thermopile” extends into the pilot flame. The thermopile generates a small electric current when it is heated. The Unitrol uses the current from the thermopile to keep the gas valve open. If the pilot goes out, the gas valve will close. This prevents the unit from leaking gas if the pilot goes out.

Once the pilot is burning, the main burners are controlled by a signal from the temperature control (A 1). When the temperature control calls for heat, it signals to the Unitrol, and the Unitrol turns on the gas supply for the main burners. A device called a “thermistor” (RT1) is used to sense the actual temperature in the kettle.

Other Circuits

This fryer has a built-in filtering system. The filter pump operates on 120V AC, and

is controlled by a switch mounted on the control box panel.

The unit includes a high temperature limit switch (S3). This switch uses a sensor bulb which is mounted inside the fry kettle. When the temperature of the shortening rises above 450°F (232°C), this switch opens. On the version with standing pilot ignition, when the hi limit switch opens it causes the Unitrol to close, cutting off the gas supply to the fryer.

The pump will not be able to move the shortening if it has cooled and become solid. The filter pan has a 120V resistive heating element (HR1) which can be turned on by a switch behind the front door.

This fryer which includes a standard pilot and is wired for 120V AC has one transformer (T1). This transformer produces 24V AC for the computer on the front of the fryer. A 4 Amp slow-blow fuse protects the 24V AC output to the control circuit.

7. Drain switch. The controller will turn off if the drain valve is opened. If the controller

will not turn on, make sure the drain valve is closed.

L22-234 Rev 0 (03/03)

Pitco Frialator DD 24R-UFM Doughnut Fryer

Troubleshooting

L22-234 Rev 0 (03/03)

Pitco Frialator DD 24R-UFM Doughnut Fryer

Troubleshooting

Fig 26 Schematic 700341

L22-234 Rev 0 (03/03)

Pitco Frialator DD 24R-UFM Doughnut Fryer

Troubleshooting

L22-234 Rev 0 (03/03)

Fig 27 Schematic 700341

Pitco Frialator DD 24R-UFM Doughnut Fryer

Troubleshooting

FRYER PROBLEM CAUSE CORRECTIVE ACTION

Computer does not come on; nothing shows in either display.

Computer heat light comes on but burners do not light.

Computer displays “OFF” and cannot be turned on

A. Main circuit breaker is

turned off.

B. Fryer fuse (F1) is blown A. Hi limit switch may be

tripped.

B. Pilot not lit C. Gas valve not in the on

position

A. Drain valve open B. Drain valve switch loose C. Drain valve switch out of

alignment

D. Bad computer.

A. Locate the correct building circuit

breaker, turn off and back on.

B. Call an Authorized Service Technician A. Allow oil to cool and reset the hi limit

switch

B. Light pilot C. Make sure pilot is lit and the gas valve

is in the on position

A. Close drain valve completely B. If mounting screws are loose, try to

tighten

C. Align switch or call Authorized Service

Technician

D. Locate the correct building circuit

breaker, turn off and back on. If this does not reset the computer, call an Authorized Service Technician.

Computer displays “Prob” A. Open or shorted

temperature probe.

A. Call Authorized Service Technician to test and replace probe.

FILTER PROBLEM CAUSE CORRECTIVE ACTION

Filter pump not running with pump switch on

Filter pumps slowly and/or blows air bubbles into to oil. Four to five minutes to fill tank

Heater in filter pan will not heat. Pan heat light (DS1) is not on when heater ON/OFF switch (S2) is in the on position

Heater in filter pan will not heat. Pan heat light is on when heater on/off switch is on.

A. Main circuit breaker is

turned off

B. Circuit breaker/Pump

switch (CB1) is open or in off position

C. Defective pump motor

A. Defective filter

connections

B. Blocked filter paper C. Bad pump D. Intake hose leaking

A. Main circuit breaker is

turned off

B. F2 fuse is blown C. Defective pan heat

switch

A. Pan heater not plugged

B. Defective pan heater

A. Locate the correct building circuit

breaker, turn off and back on

B. Turn off and back on C. If motor is getting 120V AC and does not

run, call an Authorized Service Technician

A. Replace filter connections if air bubbles

are in the oil being returned to the vat

B. Change the filter paper C. Call Authorized Service Technician D. Call Authorized Service Technician

A. Locate the correct building circuit

breaker, turn off and back on

B. Replace fuse, why did fuse blow? C. Replace switch

A. Plug in pan heater cord to entrance box B. Check the resistance through the heating

element. You should see a resistance of approximately 36 ohms.

L22-234 Rev 0 (03/03)

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