Pitco Frialator E7 Service Manual

SERVICE SECTION

There's Always Something Cooking!

Service, Parts, and Schematics

For Electric Fryers With Options

Including Options, Built-In and UFM (Spacefighter)

Filter Systems

Covering Models

E7, E7B, E12, E14, E14B, E14X, E18, & E18B

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

[phone] • [phone] • FAX [phone]

A BLODGETT Company

MTS # PF05-01 Pitco Frialator #L20-055 Revision 11 Rev. Date 07/18/94

Table of Contents (Service)

Section Title Page

Table of Contents (Service)..........................................................................................................i-ii

List of Figures .......................................................................................................................... ii

Chapter 4: Service ..................................................................................................................... 4-1

4.1 REPLACEMENT PROCEDURES ........................................................................... 4-1

4.1.1 Heating Element Removal and Replacement ...................................................... 4-1

4.1.2 Backup Thermostat Replacement - Computer Models Only............................... 4-2

4.1.3 Calibrating the Thermostat - Computer Models Only ......................................... 4-3

4.2 TESTING CONTACTORS (RELAYS) .................................................................... 4-3

4.3 TESTING HEATING ELEMENTS .......................................................................... 4-4

4.4 TESTING THE TEMPERATURE SETTING POTENTIOMETERS ...................... 4-4

4.5 TESTING THE TEMPERATURE CONTROL MODULES ................................... 4-4

4.6 TESTING THE TEMPERATURE PROBE .............................................................. 4-5

4.7 TESTING THE HEATING ELEMENT INTERLOCK ............................................ 4-5

4.8 TROUBLESHOOTING FRYERS WITHOUT COMPUTERS................................ 4-7

4.9 TROUBLESHOOTING FRYERS WITH COMPUTERS ...................................... 4-14

4.10 TROUBLESHOOTING BASKET LIFT PROBLEMS .......................................... 4-16

4.11 TROUBLESHOOTING BUILT-IN FILTER UNITS ............................................. 4-18

4.12 TROUBLESHOOTING UFM FILTER UNITS ..................................................... 4-21

Chapter 5: Parts ....................................................................................................................... 5-1

Fig. No.

5-1 Outside View ............................................................................................................. 5-2

5-2 Entrance Box ............................................................................................................. 5-3

5-3 Inside Fryer Tank Components ................................................................................. 5-4

5-4 Frame-Cabinet / Electrical Assemblies With Components ....................................... 5-7

5-5 UFM Filter, Frame/Electrical Assembly ................................................................... 5-9

5-6 UFM Pilter, Pick-Up/Pan Assembly ....................................................................... 5-11

5-7 UFM Filter, Motor / Return Assembly .................................................................... 5-13

5-8 Built-In Filter Pan With Components...................................................................... 5-15

5-9 Filter Piping With Components ............................................................................... 5-17

5-10 Built-In Filter With Accessories .............................................................................. 5-19

ALPHABETICAL PART LIST .............................................................................. 5-20

NUMERICAL PART LIST ..................................................................................... 5-24

i

Table of Contents (Service) Cont.

Section Title Page

Chapter 6: Schematics.............................................................................................................. 6-1

List of Tables and Figures

Table No. Title Page

5-1 Frame-Cabinet / Electrical Assemblies With Components ....................................... 5-6

5-2 UFM Filter, Frame/Electrical Assembly ................................................................... 5-8

5-3 UFM Pilter, Pick-Up/Pan Assembly ....................................................................... 5-10

5-4 UFM Filter, Motor / Return Assembly .................................................................... 5-12

5-5 Built-In Filter Pan With Components...................................................................... 5-14

5-6 Built-In Filter Piping With Components ................................................................. 5-16

5-7 Built-In Filter With Accessories .............................................................................. 5-18

Figure No. Title Page

5-1 Outside View ............................................................................................................. 5-2

5-2 Entrance Box ............................................................................................................. 5-3

5-3 Inside Fryer Tank Components ................................................................................. 5-4

5-4 Frame-Cabinet / Electrical Assemblies With Components ....................................... 5-7

5-5 UFM Filter, Frame/Electrical Assembly ................................................................... 5-9

5-6 UFM Pilter, Pick-Up/Pan Assembly ....................................................................... 5-11

5-7 UFM Filter, Motor / Return Assembly .................................................................... 5-13

5-8 Built-In Filter Pan With Components...................................................................... 5-15

5-9 Filter Piping With Components ............................................................................... 5-17

5-10 Built-In Filter With Accessories .............................................................................. 5-19

ii

Chapter 4: Service

This chapter provides the qualified technician with the replacement and troubleshooting procedures
necessary to service the Pitco fryer.

4.1 REPLACEMENT PROCEDURES

These procedures are provided to the qualified technician as a guide to removal and replacement of
various fryer components. If a test is required to verify component operation after installation, it will
be referenced.

WARNING

To prevent burns, always ensure the fryer is completely SHUT DOWN and
COOLED down before working on the fryer. Do not break any fryer gas
connections while the unit is connected to a gas supply line.

WARNING

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

4.1.1 Heating Element Removal and Replacement

Replacing a heating element is a complex and time consuming procedure. Ensure that you have
tested the heating elements to determine that the element is bad and not something else.

a. Move the fryer out to gain access to the rear panels. Remove the upper small access cover

and the large lower access cover.

b. The terminal block for the heating elements is located behind the lower access plate. Tag

the connections with wire markers for easy reinstallation, and remove the wires. The
temperature probe wires are not connected through the terminal board. To disconnect the
temperature probe, remove the small access plate on top of the pivot box (plate opposite
High Limit switch). The connector for the probe is inside the pivot box. Disconnect the
probe at this connector and gently pull the wire out of the pivot box.

c. Disconnect the spring assembly from the pivot box by raising the elements and holding

them in place with a board across the tank. Do not use the element bracket to hold the
elements up.

d. Next remove the pivot box assembly by removing the screws that attach the pivot box

hinges to the fryer. The heating elements will need to be raised to gain access to the screw
heads. Support the heating element assembly before removing the screws. Removing
the hinge screws frees the heating element assembly from the fryer.

4-1

e. Once free of the fryer, set the element assembly aside. Remove the access plate on the

back of the pivot box to gain access to the heating element connectors. Disconnect the
wire for the defective element.

f. Loosen the nuts that attach the heating element to the pivot box. Slide the heating element

out of the pivot box.

g. Install the new heating element by reversing this procedure.

4.1.2 Backup Thermostat Replacement - Computer Models Only

Only fryers that have computer controls have this backup thermostat. If your fryer does not have
a computer but does have a thermostat behind the door, this is a thermostat behind the door model.
That means that the knob behind the door controls the solid state temperature module behind the
fryer's control panel (front bezel). The backup thermostat includes the temperature adjustment knob,
temperature sensor inside the fryer tank, and connecting capillary tubing. The high limit controls
also has a temperature sensor in the fryer tank, so ensure you are removing the correct temperature
sensor.

CAUTION

Thermostat capillary tubing is very delicate. Be VERY CAREFUL when
working with the capillary tubing. If the tubing is kinked or broken the
thermostat is no longer usable.

a. Drain the oil from the fryer. The thermostat probe (heat sensor) is clamped to the heating

element assembly inside the tank. Unscrew and remove the two screws in the thermostat
probe clamp.

b. Remove the thermostat probe from the clamp and straighten the capillary tubing.

Unscrew the small hex nut inside the cabinet under the tank for the thermostat control.

c. Unscrew the large connector nut from the fryer tank and pull the thermostat probe and

capillary tubes through the opening.

d. Pull the knob off of the thermostat. Remove the entrance box cover to gain access to the

thermostat.

e. Mark and disconnect he wires from the thermostat terminals.

f. Remove the two screws that hold the thermostat to the inside of the entrance box. Remove

the defective thermostat control unit from the fryer.

g. Install the new thermostat in reverse order. Remember to be careful with the capillary

tubes.

4-2

h. Use pipe joint compound on the large fitting before installing to prevent oil leakage. DO

NOT use joint compound on the small nut.

i. Perform the calibration procedures detailed in section 1.5.3.

4.1.3 Calibrating the Thermostat - Computer Models Only

To calibrate this thermostat the dial must be removed from the shaft. The adjustment for the
thermostat is inside the dial shaft.

a. To calibrate the thermostat you must first cause the computer to switch control to the

backup thermostat. To do this, remove the computer from the front panel and disconnect
the connector from the computer. The transfer relay will de-energize and temperature
control will shift to the backup thermostat.

b. Place the tip of a high accuracy thermometer in the shortening approximately 1" above

the temperature sensor.

c. Set the thermostat dial to 325°F and turn the fryer on.

d. Remove the thermostat dial by pulling the knob straight out. DO NOT rotate the dial.

e. Hold the outside of the shaft so it does not move. Use the tip of a small, flat tip screw

driver to scrape away the sealing compound from the adjustment screw. Turn the
adjustment screw clockwise to lower the temperature setting, and counterclockwise to
raise the temperature. One quarter turn will change the temperature approximately 25°F.

f. Turn the adjustment until the heating elements turn off at 325°F. Replace the knob and

allow the fryer to cycle 4 to 6 times. Check the temperature of the thermometer against
the thermostat dial, if it is greater than 5°F repeat the calibration procedure.

g. When the calibration is correct, remove the thermometer.

4.2 TESTING CONTACTORS (RELAYS)

Contactors and relays use a control voltage to energize the electro magnet and close a set of contacts.
The control voltage is applied to a solenoid-type coil. When measuring a coil's resistance, ensure that
you have disconnected it from the fryer's electrical system. This will ensure that you are measuring
the coil's resistance and not a portion of the fryer's wiring. When measured with an OHM meter these
coils should have a very low resistance, less than 100 ohms. Measure each of the contactors that are
suspect. If any relay or contactor indicates an open circuit or high amount of resistance, replace the
coil.

4-3

4.3 TESTING HEATING ELEMENTS

To check a heating element first place the OFF-ON-START switch in OFF. Check the elements by
performing the following:

a. The terminal block that connects the heating elements to the fryer is located behind the

large rear access panel. Move the fryer out and remove the access panel.

b. Using an OHM meter check continuity from one end of the element to the other. The

reading should be very low (a few ohms). If the element indicates an open circuit, replace
the element.

c. Next check from the hot side of the element to ground. It should be infinite, if it is not

replace the element.

4.4 TESTING THE TEMPERATURE SETTING POTENTIOMETERS

The temperature setting potentiometer is a variable resistors. To test the potentiometer ensure that
the OFF-ON-START switch is OFF and perform the following:

a. For thermostat knobs mounted on the front of the fryer, remove the front bezel to gain

access to the back of the potentiometer. If the fryer has the thermostat knob mounted
behind the door (in the entrance box), remove the entrance box cover to gain access to
the back of the potentiometer.

b. Disconnect P10 from J10.

c. Connect an ohm-meter to pin 3 (yellow wire) and pin 1 (violet wire) and rotate the

temperature control knob. The resistance should vary from 0 to 900 ohms.

b. Connect the ohm-meter between pin 3 (yellow wire) and pin 5 (orange wire) and rotate

the knob. The resistance should again vary from 0 to 900 ohms. If the resistance is not
within the ranges specified replace the temperature setting potentiometer.

4.5 TESTING THE TEMPERATURE CONTROL MODULES

The temperature control module receives 24 VAC when the OFF-ON-START switch is ON. To test
the temperature control module perform the following:

a. The temperature control module is located behind the front bezel. Remove the two screws

that hold the bezel in place and move out of the way.

b. Place the OFF-ON-START switch in ON and the Melt switch in OFF. This will apply 24

VAC to pin 1 (black wire) with pin 3 as the common (white wire) of the temperature control
module.

4-4

c. Set the temperature setting potentiometer to a temperature above the shortening's current

temperature. This will cause the temperature control module to close and pass 24 VAC to
pin 12 (gray wire) of the control module.

d. Check the temperature probe as described in section 4.6.

e. If the temperature probe test passes and there is not 24 VDC present on pin 12 of the control

module, replace the temperature control module.

4.6 TESTING THE TEMPERATURE PROBE

WARNING

All power supplies must be disconnected before servicing the appliances.
Some appliances have more than one power supply. Make sure they are ALL
disconnected.

The temperature probe is a special type of resistor called a thermistor. Check the temperature probe
by performing the following:

a. Gain access to the temperature probe connection by removing the front panel. Disconnect

P10 and check the resistance of the probe at pins 2 & 4 of P10.

b. Place the OFF-ON-START switch in OFF. Use an ohm-meter to measure the resistance

across the probe. It should be about 100K ohms at room temperature (72°F, 22°C). If the
probe indicates an open or more than 200 ohms away from 100K ohms, replace the probe.

c. Re-install the probe wires and turn on the fryer. Start the fryer and raise the shortening

temperature to normal cooking temperature, approximately 350°F.

d. Unplug the temperature probe and measure the resistance again. It should read approxi-

mately 923.8 ohms ±10 ohms. If the resistance is different by more than 10 ohms, replace
the temperature probe.

4.7 TESTING THE HEATING ELEMENT INTERLOCK

The heating elements are protected from accidental over heating, due to lifting them out of the oil
while unit is ON, by an interlock limit switch. The switch is located on the right side (opposite the
High Limit switch) of the heating element pivot box.

a. This test requires that you gain access to the back of the interlock switch. Remove the four

screws from the small access plate on the top, right of the pivot box. Gently move the wiring
harness to the side to expose the wiring terminal of the interlock switch.

4-5

b. Connect an ohm-meter across the switch terminals to measure the resistance across the limit

switch connection.

c. When the elements are down in the tank the interlock switch is closed and the resistance

across the switch will be zero.

d. Lift the element rack up while continuing to measure the resistance across the switch. The

rack only needs to be lifted a short distance to open the switch. A click should be heard when
the switch opens. The resistance will go up significantly when the switch opens. The
resistance will not be infinite unless the switch wires are disconnected. If there is any doubt
about the resistance, remove the wires and check the resistance. With the wires removed the
resistance will be infinite.

4-6

4.8 TROUBLESHOOTING FRYERS WITHOUT COMPUTERS

p

Fryer does not

operate properly!

Is the fryer

filled with oil?

YES

Does the

POWER ON

indicator light?

YES

NO

NO

Refer to Chapter 2 for

proper filling and

operation of the fryer.

Is the Fryer

connected to building

power supply?

NO

Connect fryer to building

power supply as described in

Chapter 1.

YES

Is the service

panel circuit

breaker tripped?

NO

Is the fire
protection tie in
system closed?

YES

YES

NO

Determine reason for

tripping. Reset the

circuit breaker.

Ensure that the fire

protection system is closed

or that the fire protection

oint is closed.

tie in

Is the control fuse

(F1) blown?

YES

Are the heating

elements down and is

the interlock

YES

working?

YES

Test the ON/OFF/TEST Switch

A

and replace if necessary

NO

NO

Determine the cause for

blowing. Replace the fuse.

(Refer to 3.6)

Ensure the the heating
elements are down. Check
the interlock switch per 4.7

and replace if necessary.

4-7

A

p

Does the fryer

heat up?

YES

NO

Does the

HEATING light

come on?

Are the heating

elements down and is

the interlock

working?

Is the High Limit

switch open?

YES

YES

NO

NO

Ensure that the heating
elements are down. Check
the interlock switch per 4.7

and replace if necessary.

YES

Reset switch and

check trip setting.

Test the temperature

probe as described in 4.6.

Is the temperature probe

defective?

NO

Test the

temperature set

potentiometer as described in

4.4. Is the potentionmeter
defective?

YES

Replace the
temperature

probe.

YES

Replace the

potentiometer

NO

Test the

NO

B

C

temperature control

module as described in

4.5. Is the module
defective?

NO

Verify continuity of the leads

which provide 24 VAC power,

and the potentiometer and

robe signals to the module.

YES

Replace the

module.

4-8

B

C

YES

Does HEATING

light go out when

thermostat is set above

oil temperature?

YES

NO

Test the temperature

probe as described in 4.6.

Is the temperature probe

defective?

NO

Test the temperature

set potentiometer

as described in 4.4. Is

the potentionmeter

defective?

YES

Replace the
temperature

probe.

YES

Are heating

element fuses

blown?

NO

Check heating

elements as

described in 4.3.

Are they good?

YES

Check contactors K7 thru K10. Check

wiring for loose connections. Check

continuity between the grey lead on

each contactor and the grey lead to the

HEATING light.

YES

Replace the fuse(s)

and determine the

cause for blowing.

NO

Replace the

defective heating

elements

Replace the

NO

Test the

temperature control

module as described

in 4.5. Is the module

defective?

NO

Verify continuity of the leads

which provide 24 VAC power,

and the potentiometer and probe

D

signals to the module.

potentiometer.

YES

Replace the module.

4-9

D

NO

Does HIGH LIMIT

switch trip during normal

operation?

NO

YES

Is solid

shortening being

melted?

NO

Is shortening

level too low?

NO

Is High Limit

capillary tube

touching the heating

elements?

NO

YES

YES

Ensure that shortening is packed

tightly around heating elements!

Make sure that the Melt Cycle

switch is set to MELT ON.

Ensure that shortening level is filled

to the level mark.

YES

Gently move the capillary tube

away from the heating elements

Are the heating
elements dirty?

NO

Is the thermostat

set too high?

Test the

Replace the

module.

E

YES

temperature control
module as described
in 4.5. Is the module

NO

defective?

YES

YES

NO

Perform a through cleaning of

the fryer as described in 3.2.

Check the setting and

calibration of the thermostat.

If the High Limit switch can
not be reset of continues to
trip early replace the switch.

4-10

E

Does the

shortening get too

hot?

NO

Does the

shortening not get

hot enough?

YES

YES

Is the shortening

level too low?

NO

Is the thermostat

set too high?

NO

Test the temperature probe as

described in 4.6. Replace

temperature probe if defective.

Is the thermostat

set too low?

YES

YES

Ensure that shortening level is filled

to the level mark.

Check the setting and

calibration of the thermostat.

YES

Check the setting and

calibration of the thermostat.

NO

Check heating

elements as

described in 4.3. Are

NO

Test the temperature probe as

F

they all good?

YES

described in 4.6. Replace the
temperature probe if defective.

NO

Replace the defective

heating elements

4-11

F

Does the fryer

heat intermittently?

NO

Does the fryer

heat slowly?

YES

Is the fryer

connected to the

proper voltage supply and

is it connected

properly?

NO

Fryer is functioning

NO

YES

properly.

Test the temperature

probe as described in 4.6.

Is the t emperature probe

defective?

NO

Test the temperature
set potentiometer as

described in 4.4. Is the

potentionmeter defective?

NO

Test the

temperature control

module as described in

4.5. Is the module
defective?

NO

YES

YES

Replace the
temperature

probe.

YES

Replace the

potentiometer.

Replace the

temperature control

module.

YES

Are the heating

elements clean?

YES

G

Correct the installation.

NO

Perform a weekly cleaning

of the fryer (3.2)

Check heating elements as

described in 4.3. Replace

heating elements if necessary.

4-12

G

Are any of the

heating elements

fuses blown?

NO

Check heating

elements as described

in 4.3. Are they all

good?

YES

Is the

temperature probe loose

or in the wrong

location?

YES

NO

Replace the blown fuses.

Replace the defective

heating elements

YES

Move or tighten the

probe.

NO

Check contactors K7 thru K10. Check

wiring for loose connections. Check
Continuity between the grey lead on

each contactor and the grey lead to

the HEATING light.

4-13