Pitco SGH50 Service Manual

Technical Service and Exploded Parts

For Gas Fryers

Covering Models

SGH50 Full and Twin

CAN

FRANCAIS

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

L22-235 Rev 1 (10/12)

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

www.pitco.com

WARNING! FIRE HAZARD

THE OIL LEVEL SHOULD NOT FALL BELOW THE MINIMUM INDICATED LEVEL AT ANY TIME.

THE USE OF OLD OIL CAN BE DAGEROUS AS IT WILL HAVE A REDUCED FLASH-POINT

AND BE MORE PRONE TO SURGE BOILING.

WARNING

INSTALLATION AND ALL CONNECTIONS MUST BE MADE ACCORDING TO NATIONAL AND

LOCAL REGULATIONS AND CODES IN FORCE.

WARNING

A COUNTRY APPROVED ALL POLE CIRCUIT BREAKER WITH A MINIMUM OPEN CONTACT

GAP OF 3mm MUST BE USED FOR PROPER INSTALLATION.

WARNING

THE FRYER IS NOT JET STREAM APPROVED. DO NOT CLEAN THE APPLIANCE WITH A

WATER JET.

NOTICE

INSTALLATION SHOULD ONLY BE DONE BY A COMPETENT SERVICE TECHNICIAN. THE

MODEL & SERIAL NUMBER, AND ELECTRICAL REQUIREMENTS STAMPED INTO THE DATA

PLATE, LOCATED ON THE INSIDE PANEL OF THE DOOR.

NOTICE

THIS APPLIANCE IS INTENDED FOR PROFESSIONAL USE ONLY, AND AS SUCH, SHOULD

BE OPERATED BY FULLY TRAINED PERSONNEL.

NOTICE

IT IS RECOMMENDED THAT THIS MACHINE BE INSPECTED BY A QUALIFIED TECHNICIAN

ON A YEARLY BASIS.

WARNING

THE POWER SUPPLY MUST BE DISCONNECTED SERVICING OR CLEANING THE UNIT.

WARNING

SHORTENING, WHEN IT IS AT OPERATING TEMPERATURES, IS VERY HOT AND

DANGEROUS! USE EXTREME CAUTION WHEN HANDLING! USE PROPER PROTECTIVE

GEAR SUCH AS INSULATED GLOVES, APRONS, FACE SHIELD, AND SLEEVES WHEN

HANDLING HOT SHORTENING. DO NOT ATTEMP TO MOVE MACHINE THAT HAS HOT OIL IN

IT. ALLOW TO COOLTO ROOM TEMPERATURE OR DRAIN THE OIL INTO A SUITABLE

CONTAINER BEFORE MOVING THE FRYER.

L22-235 Rev 1 (10/12)

Table of Contents

How Does It Work? ........................................................... 4

Component Troubleshooting.............................................. 4

Temperature Probe Resistance Chart ................................. 5

Basic Trouble Shooting ...................................................... 8

Relay Board Component Explanation ................................ 10

Ladder Diagram .................................................................. 13

CAN

Schematics .........................................................................14-19

Basic Parts List................................................................... 21

Exploded Drawings ............................................................ 22-31

Front Panel and Tank Components .................................... 22

Pump Box and Drain Manifold........................................... 24

Main Entrance Box and Gas Components .........................26

Pump Assembly and Filter Pan .......................................... 28

Wire Harness’..................................................................... 30

L22-235 Rev 1 (10/12)

Chapter 1: HOW DOES IT WORK?

Filter System:

The SGH50 fryer components function in specific order of operation. Knowing and understanding the sequence

• Opening the RED return valve handle will close of fryer and components operation will enable you to diagnose equipment failure more accurately.

Heating System

Power to the machine is turned ON:

• If Fuse F1 on the Relay board is good, the A.C.

• The pump system is equipped with a circuit breaker

indicator will illuminate and the controller will be supplied with 24 VAC and, if the drain valve handle is closed, the proximity switch will supply 24 VAC to the DVI (drain valve interlock) input at the controller.

• The computer or solid state control is turned ON:

• The return piping system may be provided with

• The side on relay will be energized, closing the

circuit and the S.O. indicator on the Relay Board will illuminate. If the hi limit is NOT tripped the ignition module will receive 24VAC at terminal 6 (24 VAC).

Optional Basket Lift:

• The ignition module will have a 24 VAC output from

terminal 3(PV) to the PV terminal on the gas valve

• The basket lift is a self contained unit that requires

and the ignitor will spark. When the pilot has lit and the module has proven the pilot flame, it will have a 24 VAC output at terminal 1(MV) and put 24 VAC on pin #2 at connection J/P32 on the relay board. The heat demand relay on the relay board will interrupt the 24 VAC supply to the gas valve until the controller calls for heat. Note: When the controller is on, the pilot should always remain lit.

• Controller calls for heat:

• The heat demand relay will energize supplying the

gas valve with 24 VAC and the H.D. indicator on

Probe:

the Relay Board will illuminate. This will also supply the computer with a heat feedback signal.

The resistance of the probe will change as the temperature changes. The resistance will decrease as the

Hi Limit System:

temperature rises. If the probe is suspect, check its resistance and the oil

• If the hi limit trips, it interupts the 24 VAC supply to

the ignition module. When the controller calls for heat, it will not receive a 24 VAC heat feed back. With approximately 90 seconds of heat feed back loss, the controller will indicate an ignition failure or heat failure. After the hi limit is reset (unit cools to 400°F + 20°F) the computer will have to be turned off and back on for the unit to heat.

temperature at which it was taken. Compare these values on the probe resistance chart. If the probe returns an open circuit or 0 Ohms reading, it should be replaced. If the resistance varies more than 30 Ohms when being checked between 325375°F the probe will give a false temperature reading on the computer and should be calibrated (up to 10°F) or replaced. However, it will continue to operate at a slightly higher or lower temperature.

L22-235 Rev 1 (10/12) 4

the proximity switch causing the "pump run" relay to be energized. The pump motor will begin to run.Closing the return valve handle will de-energize the relay and the pump motor will stop running.

which will de-energize the system and the heat tape in the event of over current. The circuit breaker switch must be in the ON position for the pump and heat tape to operate.

optional heat tape to prevent solidification of solid shortening. The heat tape is low wattage and is on constantly to maintain liquid shortening in the line.

a 120, 208 or 240V supply. With most fryer configurations, the power is supplied from the entrance box at the back of the fryer but some cofigurations will require power direct from a wall outlet. When power is supplied to basket lift assembly, the baskets will lift to the up position. The baskets will lower with a 24 VDC output from the controller.

Chapter 2: COMPONENT

TROUBLESHOOTING:

This test will cause the burners to run continuously. Remove test resistor when test is complete. Leaving the test resistor in the fryer could cause damage to equipment and/or personal injury.

To test the hi-limit, use a 2kΩ - 5kΩ resistor to simulate a 230°F - 275°F temperature. This will cause the burners to run continuously until the hi-limit trips or the fryer is turned off.

•If the fryer is equipped with a computer or digital controller, plug the resistor in at connector J41 behind the front panel.

•If the fryer is equipped with a solid state controller behind the door, plug the resistor in at connector J43 behind the front panel.

Allow the oil to cool and check the probe resistance at a lower temperature. As can be seen from the chart a greater variation can be tolerated at a lower temperature.

Gas Valve:

The gas valve has a dual 24 VAC operator and will open when the correct voltage is supplied to the operator. With 24 VAC applied to the PV (24 VAC) connection, the pilot valve operator will open, allowing gas to flow to the pilot. With 24 VAC applied to the MV (24 VAC) connection, the main valve operator will open, allowing gas to flow to the main burners.

Hi Limit:

The hi - limit switch is a normally closed switch until the temperature at the hi-limit bulb reaches 450°F ± 15°F.

WARNING!

This test should be performed by a qualified technician only! Monitor the fryer closely. This test will cause the oil to heat past the normal operating temperature and can cause damage to the machine and its operator if care is not taken.

WARNING!

If the switch does not trip between the prescribed limits it is defective and should be replaced. Once tripped, the switch cannot be reset until the oil has cooled to approximately 400°F + 20°F. If the switch does not reset after oil has cooled it is defective.

Drain Valve & Return Valve Switches:

These switches are a magnetically operated proximity switches. When the Drain Valve handle is moved to the open position, the Actuator will move away from the switch causing the switch to open. When the Drain Valve is closed the switch will close.

Opening the RED return valve handle will close the proximity switch causing the "pump on" relay to be energized. The pump will begin to pump. Closing the return valve handle will open the proximity switch causing the relay to de-energize and the pump will stop pumping. These switches can also be checked with an Ohm meter. When the switch is closed, you should have continuity. The normal gap between the Actuator and the Sensor switch on the valve handle is 1/8" - 1/4" (3 6mm).

Transformer:

The transformer is a multiple AC input voltage 24 VAC output voltage and can be checked by reading the input and output voltages. A quick check for 24 VAC can be done at the relay board behind the front panel. The AC

L22-235 Rev 1 (10/12)

indicator will be illuminated if the F1 fuse is good and the board is receiving 24 VAC.

Ignition Module:

With a 24 VAC input at pin #6, the ignition module will have a 24 VAC output from terminal 3(PV) and the ignitor will spark until the module senses pilot flame or for approximately 90 seconds at which time the module will lock out, whichever occurs first. When the module has proven the pilot flame, it will have a 24 VAC output at terminal 1(MV) and put 24 VAC to pin 2 at connection J/ P32 on the relay board. The relay board will interrupt the 24 VAC to the gas valve until the controller calls for heat.

Note: When the controller is on, the pilot should always remain lit.

Relay Board:

Note: J connectors are marked on the relay board.

•With 24 VAC supplied to pin #2 at connector J35 and a good F1 fuse, the relay board will have a 24 VAC output at pin #2 on connectors J33 and J34 and the A.C. indicator will be illuminated.

Note: If the fryer is equipped with a computer or solid state digital, at connection J33 there will be a jumper from pin #2 to pin #10 to supply 24 VAC to pin # 2 at connection J31 to supply the controller with 24VAC.

•When the board receives a 24 VDC side on input at pin #7 on connectors J31 or J33, the S.O. indicator will illuminate, the side on relay (S.O.) will energize and there will be a 24 VAC output at pin #4 on connector J32.

•When the board receives a 24 VDC heat demand input at pin #6 on connectors J31 or J33, the H.D. indicator will illuminate, the heat demand relay (H.D.) will energize and there will be continuity between pin #1 and pin #2 at connector J32.

Computer Control:

Note: All controller test points are at connector P/J1 (clos-

est connector to the controller).

•With 24 VAC supplied to pin #1(24VAC supply) and pin # 5(24VAC input from DVI), the display should read "OFF".

•With the controller turned on, there will be a 24 VDC

output at pin #9 (side on).

•When the controller calls for heat, there will be a 24 VDC output at pin #8 (heat demand) and a 24 VAC input at pin #6 (heat feed back). If the controller does not receive the 24 VAC input at pin #6 in approximately 90 seconds, the controller will display "HEAT FAIL" or "IGNITION FAILURE". This would indicate a break in the heat demand or heat feed back circuit.

1. Check the hi-limit switch (is it open or tripped).

2. Check the ignition module (sensing pilot flame, locked out, 24 VAC at MV terminal).

3. Check the heat demand relay (H.D.) on the relay board (is heat demand relay energized, continuity through COM and NO contacts).

•If display reads "PROBE OP" "OPEN", ohm test the temperature probe. Check the wires and connectors between the probe and controller for continuity.

•If display reads "SYSTEM" "FAILURE", test the temperature probe and the wires and connectors between the probe and controller for a short.

•If display reads "DRAINING" "TURN OFF", verify that the drain valve is closed, check the proximity switch on the drain valve, turn the fryer off, then turn the fryer on.

Digital Solid State Control:

Note: All controller test points are at connector P/J1 (clos-

est connector to the controller).

•With 24 VAC supplied to pin #1(24VAC supply) and pin # 5(24VAC input from DVI), the display should read "OFF".

•With the controller turned on, there will be a 24 VDC output at pin #9 (side on).

•When the controller calls for heat, the display will read "HEAt", there will be a 24 VDC output at pin #8 (heat demand) and a 24 VAC input at pin #6 (heat feed back). If the controller does not receive the 24 VAC input at pin #6 in approximately 90 seconds, the controller will display "HEAt" "FAIL" . This would indicate a break in the heat demand or heat feed back circuit.

1. Check the hi-limit switch (is it open or tripped).

2. Check the ignition module (sensing pilot flame, locked out, 24 VAC at MV terminal).

3. Check the heat demand relay (H.D.) on the relay board (is heat demand relay energized, continuity through COM and NO contacts).

•If display reads "Prob", ohm test the temperature probe. Check the wires and connectors between the probe and

L22-235 Rev 1 (10/12) 6

controller for continuity.

•If display reads "Prob" "HI", ohm test the temperature probe and the wires and connectors between the probe and controller for a short.

•If display reads "drn" "tUrn" "oFF", verify that the drain valve is closed, check the proximity switch on the drain valve.

Primary Solid State Control:

Note: All controller test points are at connector P/J3 (the

12 pin connector at the controller).

•24 VAC is supplied to the controller at pin #1(24VAC supply) and pin # 5 (24 VAC input from DVI),

•With the controller turned on, there will be a 24 VDC output at pin #9 (side on) and the green indicator will be illuminated.

•When the controller calls for heat, there will be a 24 VDC output at pin #8 (heat demand), the yellow indicator on the left will be illuminated and there will be a 24 VAC input at pin #6 (heat feed back).

•When the controller receives the 24 VAC input at pin #6, the yellow indicator on the right will illuminate. If the controller does not receive the 24 VAC input at pin #6, the indicator will not illuminate. This would indicate a break in the heat demand or heat feed back circuit.

1. Check the hi-limit switch (is it open or tripped).

2. Check the ignition module (sensing pilot flame, locked out, 24 VAC at MV terminal).

3. Check the heat demand relay (H.D.) on the relay board (is heat demand relay energized, continuity through COM and NO contacts).

•If the green indicator and the yellow indicator on the left come on and shut off when the controller is turned on, that indicates an open or shorted probe or wires in between the probe and the controller.

•If none of the indicators illuminate when the controller is turned on, verify that the drain valve is closed and that the magnetic proximity switch has continuity when the drain valve is closed. Also verify that there is 24 VAC at pin #1 (24 VAC supply) and pin #5 (24 VAC input from DVI).

controller has been unplugged, the primary controller will not work. The jumper must be installed on the relay board (connection J33) to allow the primary controller to function if the backup controller is removed.

Optional Basket Lift:

•The basket lift is a self contained unit that requires a 120, 208 or 240V supply. With most fryer configurations, the power is supplied from the entrance box at the back of the fryer but some cofigurations will require power direct from a wall outlet.

•When supply voltage is applied to the basket lift assembly, it goes through a voltage selector switch to a multi tap 24V, 80VA transformer. The transformer supplies 24 VAC to the driver board at connection J54. Note: When power is supplied to basket lift assembly, the baskets will lift to the up position.

•When a timer is activated, it will send a 24 VDC signal to pin #1 (24 VDC+) at connector J51 on the driver board. The driver board will generate a 24 VDC output at J53 to the basket lift motor, lowering the basket. Note: For the purpose of testing, jumping pins #1 and #2 at connection J5 on the driver board will simulate a 24 VDC signal from the controller, lowering the basket.

Backup Solid State Control:

The backup solid state control works the same as the primary solid state control, with the exception of the 24 VAC supply passing through the solid state backup transfer switch to the computer or solid state digital control. If the transfer switch is set to backup or if the backup

L22-235 Rev 1 (10/12)

Fryer Trouble Shooting

PROBLEM PO SSIBLE CAUSE ACTIO N

C o ntro ller will N O T t urn O N

Dis p lay d o es N O T light

Controller indicates "IGNITION

FAILURE" or "HEAT FAIL" and machine does NOT heat.

Machine is heating slowly A. Gas vavle not turned fully to the on

Oil is hotter or colder than computer

/c o ntrolle r d is p lays

C o ntro ller will no t tur n on o r d isp lays "DRAINING" or "TURN OFF"

A. No power to the machine B. F1 Fuse blown C. T1 Transformer

A. Hi limit tripped B. Heat demand relay C. Relay board

position B. Gas shut-off (yellow handle) not fully open C. Q uick d isconnect not co nnected properly D. Low gas pressure

A. Temperature calibration B. Probe C. Probe wiring terminals

A. Blue drain valve not fully closed B. Sensor switch C . I nco r r e c t s w itc h ga p /a lignme nt

A. Check building circuit breaker, verify power cord is plugged in B. Check F1 Fuse. Replace if defective C. Check voltage in and out of T1

A. O nce the oil temp has gone below 400°F + auto matically, if no t, r e p lac e Hi- limit B. Check & replace if defective C. Check & replace if defective

A. Verify that the gas valve is in the on position B. Verify that t he ye llow ha ndle is fully open (inline with the gas line) C. Verify that quick disconnect is properly connected D. Call a qualified gas technicain

A. Adjust temperature offset up to + B. Check & replace if defective C. Clean or repair terminals

A. Check position of handle B. Switch may be loose or have loose wires, replace if defective C. Check gap/alignment, replace if defective

20 °, the Hi- limit sho uld re s e t

10°F

Controller heat d emand lights are lit,

machine does not heat. HD & SO lights on relay board are lit.

Computer displays "PROBE

FAILURE"

A. K1 relay (relay board) B. Gas valve C. Ignition module

A. Shorted probe B. Open probe C. Probe wiring terminals

L22-235 Rev 1 (10/12) 8

A. Check & replace if defective B. Check & replace if defective C. Check & replace if defective

A. Check probe & replace if defective B. Check probe & replace if defective C. Clean or repair terminals

Filter Trouble Shooting

PROBLEM POSSIBLE CAUSE ACTION

Re d r e t ur n hand le is p ulled out , b ut no pump sound can be heard

Drain valve is closed, computer has been reset, but computer still displays "DRAIN IN G"

Oil is returning to the vat slowly or not at all

Air b ubbles are in the oil being returned to the vat

A. Red return handle not completly

open

B. Filter circuit breaker may be tripped or in the off position C . Filte r motor therma l o ve r lo ad ma y

be tripped

D. Sensor switch may be loose or defective

E. Powe r cord unplugged or loose

A. Blue drain valve not fully closed

B. Sensor switch C. Incorrect switch gap/alignment

A. D irty filter pape r

B. Strainer cap dirty C. Filter pan not pushed in completely

D. O-rings not sealing on pick up tube

A. Strainer cap not tight

B. Stainer cap not in pick up tube C. Filter pan not pushed in completely

D. O-rings not sealing on pick up tube

A. Pull on red return handle to make sure valve is c o mpletly ope n B. Reset the circuit breaker or press it to the on position C. Push the red reset button on the end of the motor D. Check that the switch is tight and that it has the correct gap. Replace if defective E. Check the power cord at the fryer entrance box and at the pump box and make sure that the power cords are plugged in and /or pushed in all the way

A. Check position of handle B. Switch may be loose or have loose wires, replace if defective C. Check gap/alignment, replace if defective

A. Change filter paper B. Remove strainer cap and clean it C. P ush filter pan in D. Check & replace if defective

A. Tighten strainer cap B. I nsta ll s tra iner c ap C. P ush filter pan in D. Check & replace if defective

Drain valve is open, the oil is draining slowly or not at all

A. D ra in valve is not fully o p en

B. Drain line is plugged with debris

A. Apply a little more pressure to the drain valve handle to check that the drain valve is fully o p e n B. Use the clean out rod to clear the drain valve opening. If this does not clear the blockage, close the drain valve, and call for service

L22-235 Rev 1 (10/12)

Fuse:

If fuse is blown, A.C. will not be lit.

F1 -

Relay Board Component Explanation

Trouble Shooting Lights:

When lit, F1 Fuse and T1 Transformer are good.

.C. S.O. H.D. -

When lit, A1 Computer is on and K10 Contactor should be energized. When lit, A1 Computer is on and calling for heat, K11 Contactor should be energized

Relays:

Heat Demand Relay, will be energized when A1 Computer calls for heat and when H.D. is lit.

K1 -

Side On Relay, will be energized when A1 Computer is on and A.C. is lit.

K3 -

Connectors:

J31 J32 J33 J34 J35 -

Connects to A1 Computer To Side On and Heat Demand Contactors and Heat Feed Back. To 24VAC jumper harness. To Drain Switch and optional Basketlifts Input voltage from transformer

Relay Board:

Note:

J connectors are marked on the

relay board.

•With 24 VAC supplied to pin #2 at connector J35 and a good F1 fuse, the relay board will have a 24 VAC output at pin #2 on connectors J33 and J34 and the A.C. indicator will be illuminated.

•When the board receives a 24 VDC heat demand input at pin #6 on connectors J31 or J33, the H.D. indicator will illuminate, the heat demand relay (H.D.) will energize and there should continuity between pin #1 and pin #2 at connector J32.

J32

J34

J35

A.C.

F1 FUSE

PITCO# 60127301A

DATE: MMDDYY

H.D.

HEAT

DEM ON

J33

J31

S.O.

SIDE

L22-235 Rev 1 (10/12) 10

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