Pitco MEII Parts List
Technical Service and Exploded Parts
For Electric Fryers
Covering Models
MEII, ME2 Full and Split
US
CAN
GB
FRANCAIS
Pitco Frialator, Inc., P.O. Box 501, Jct I-89 & I-93 Concord, NH 03302-0501 • 509 Route 3A, Bow, NH 03304
L22-233 Rev 1 (04/03)
(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.
L22-233 Rev 1 (04/03)
Table of Contents
How Does It Work? ........................................................... 4
Component Troubleshooting.............................................. 4
Temperature Probe Resistance Chart ................................. 4
Basic Trouble Shooting ...................................................... 6
Relay Board Component Explanation ................................ 8
Ladder Diagram .................................................................. 11
US
CAN
GB
Schematics .........................................................................12-21
Basic Parts List................................................................... 23
Exploded Drawings ............................................................ 24-33
Element and Tank Components ......................................... 24
Pump Box and Drain Manifold........................................... 26
Main Entrance Box ............................................................. 28
Pump Assembly and Filter Pan ..........................................30
Wire Harness’..................................................................... 32
L22-233 Rev 1 (04/03)
Chapter 1: HOW DOES IT WORK?
The McDonalds Electric II fryer components function
in specific order of operation. Knowing and understanding the sequence 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.
light will illuminate. The computer is supplied with
24VAC and, if the drain valve handle is closed, the
proximity switch will supply 24 VAC to the DVI
(drain valve interlock) Input at the computer.
• The computer is turned ON:
• The side on relay will be energized, closing the
circuit and the S.O. light on the Relay Board will
illuminate. If the hi limit is NOT tripped the safety
(side on) contactor will energize.
• Computer calls for heat:
• The 24 VDC "heat demand" relay will energize
supplying the heat demand contactor with 24 VAC
and the H.D. light on the Relay Board will
illuminate. This will also supply the computer with a
heat feedback signal.
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.
• The pump system is equipped with a circuit breaker
which will de-energize the system and the heat tape
in the event of overcurrent. The circuit breaker
switch must be in the ON position for the pump and
heat tape to operate.
• The return piping system may be provided with 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.
Chapter 2: COMPONENT
TROUBLESHOOTING:
Probe:
Hi Limit System:
• If the hi limit trips, it causes the side on and heat
demand contactors to lose 24VAC supply and the
heat feed back loses 24VAC. The computer will
display IGNITION FAILURE or HEAT FAIL.
After the hi limit resets (unit cools to 375°F + 20°F)
the computer will have to be turned off and back
on for the unit to heat.
Hood Relay System: U.S./Canada units only
• There is one Hood Relay (K6) per "battery" of
fryers (located on rear bottom brace of left hand
fryer), it is wired in parallel to every computer (both
sides of a twin). When any side of any computer is
turned on this relay energizes (turning on the hood)
and will stay energized until all of the computers are
turned off.
Filter System:
• Opening the RED return valve handle will close the
The resistance of the probe will change as the temperature changes. The resistance will decrease as the temperature rises. The lower the temperature the greater
the resistance change will be per degree of temperature
change, as the temperature approaches the working
range of the probe, the resistance change will become
more linear.
If the probe is suspect, check its resistance and the oil/
air temperature at which it was taken. Compare these
4L22-233 Rev 1 (04/03)
values on the chart below.
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 325-375°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.
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.
US
CAN
GB
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.
Heat Demand Contactor:
The heat demand contactor has a 24VAC coil and will
energize when the correct voltage is supplied to the
coil. When energized, the contacts will close, allowing
current to flow through the elements. The coil
resistance is 192 ohms out of circuit.
Hi Limits:
The hi - limit switch is a normally closed switch until
the temperature at the hi-limit bulb reaches 425°F ±
20°F.
In order to test this switch it will be necessary to utilize
the temperature control hi-limit feature. Refer to PM
Card FR015 for instructions on how to perform this
test.
WARNING
During this test 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.
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 375°F + 20°F. If the switch
does not reset after oil has cooled it is defective.
Once the oil has cooled the hi-limit reset button must
be pressed to reset the hi-limit relay on CE and export
units only.
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 de-energize the relay and
the pump will stop pumping. These switches can also
be checked with an Ohm meter. The normal gap
between the Actuator and the Sensor switch on the
valve handle is 1/8" - 1/4" (3 - 6mm).
Transformer:
Transformers are multiple input voltage 24 volt output
voltage and can be checked by reading the input and
output voltages. A quick check for 24VAC can be done
at the relay board behind the computer. The AC led will
be lit if the F1 fuse is good and the board is receiving
24VAC
Elements:
Each Element has three coils inside it, check all element
coils out of circuit with an Ohm Meter, the resistance
should correspond to the chart below, if the resistance
varies more than 5 Ohm the element will need to be
changed. Also check for continuity to ground on each
end of the suspect element, there should be no continuity
to ground.
208 volt elements 18.5 Ohms
220 volt elements 20.7 Ohms
240 volt elements 24.6 Ohms
Safety (Side On) Contactor:
Check the coil with an Ohm Meter, the resistance should
be approximately 3 - 6 Ohms out of circuit. If it does
not have this resistance it should be changed.
5
L22-233 Rev 1 (04/03)
Fryer Trouble Shooting
PROBLEM PO SSIBLE CAUSE ACTION
Co mp ute r will N O T tur n O N
Dis p la y doe s N OT light
Computer shows "IGNITION
FAILURE" or "HEAT FAIL" and
machine does NOT heat.
Machine is heating slowly A. Side On contactor
Oil is hotter or colder than computer
/c o ntr o lle r d is p la ys
Computer displays "DRAINING" or
"TURN OFF"
A. No power to the machine
B. F1 Fuse blown
C. T1A Transformer
A. Hi limit tripped
B. Heat demand relay
C. Relay board
B. Heat Demand contactor
C. Element
D. Loss of power on one leg of 3
phase input power
A. Temperature calibration
B. Probe
C. Probe wiring terminals
A. Blue drain valve not fully closed
B. Sensor switch
C. Inc o rr e c t s witch ga p/ a lignment
A. Check building circuit breaker, verify
power cord is plugged in
B. Check F1A Fuse. Replace if defective
C. Check voltage in and out of T1A
A. Once the oil temp has gone below
375°F +
automatically, if not, replace Hi- limit
B. Check & replace if defective
C. Check & replace if defective
A. Check & replace if defective
B. Check & replace if defective
C. Check & replace if defective
D. Check input power. Repair or call a
qua lifie d e le c tric ia n
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 should re set
10°F
Computer heat demand lights are lit,
machine does not heat. HD & SO
lights on relay board are lit.
Computer displays "PROBE
FAILURE"
A. Side on contactor
B. Heat demand contactor
C. Unit not getting 3 phase p o wer
A. Shorted probe
B. Open probe
C. Probe wiring terminals
6L22-233 Rev 1 (04/03)
A. Check & replace if defective
B. Check & replace if defective
C. Check circuit breaker, is 3 phase power
cord plugged in all the way
A. Check probe & replace if defective
B. Check probe & replace if defective
C. Clean or repair terminals
Filter Trouble Shooting
PROBLEM POSSIBLE C AUSE AC TION
US
CAN
GB
Red return handle is pulled out, but no
pump sound can be heard
Drain valve is closed, computer has
been r e s e t, b ut c o mpute r still displays
"DRAIN IN G"
Oil is returning to the vat slowly or not
at all
Air b ubbles are in t he oil being r e t ur ned
to the vat
A. Red return handle not completly
open
B. Filter circuit breaker may be tripped
or in the off position
C. F ilt e r mo tor the rmal o verload may
be tripped
D. Sensor switch may be loose or
defective
E. Po we r co rd unplugged or loo se
A. Blue drain valve no t fully closed
B. Sensor switch
C. Incorrect switch gap/alignment
A. Dirty filter paper
B. Strainer cap dirty
C. F ilt e r p a n no t pus hed in c o mp le tely
D. O-rings not sealing on pick up tube
A. Strainer cap not tight
B. Stainer cap not in pick up tube
C. F ilt e r p a n no t pus hed in c o mp le tely
D. O-rings not sealing on pick up tube
A. Pull on red return handle to make sure
valve is c o mplet ly open
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. S witch may b e lo os e o r have loo s e
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 p an in
D. Check & replace if defective
A. Tighten strainer cap
B. I ns tall straine r c a p
C . P ush filter p an in
D. Check & replace if defective
Dra in valve is o pen, the o il is d r a ining
slowly or not at all
A. Dra in valve is not fully open
B. D rain line is plugged with de b r is
7
A. Apply a little more pressure to the drain
valve handle to check that the drain valve is
fully o p en
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
L22-233 Rev 1 (04/03)
Fuse:
A
If fuse is blown, A.C. will not be lit.
F1 -
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
Relay Board Component Explanation
Relays:
K1 -
Heat Demand Relay, will be energized when A1 Computer calls for heat and when H.D. is lit.
K3 -
Side On Relay, will be energized when A1 Computer is on and A.C. is lit.
Connectors:
J31 -
Connects to A1 Computer
J32 -
To Side On and Heat Demand Contactors and Heat Feed Back.
J33 -
To 24VAC jumper harness.
J34 -
To Drain Switch and optional Basketlifts
J35 -
Input voltage from transformer
6
J32
1
F1 FUSE
J35
1
A.C.
PITCO# 60127301A
DATE: MMDDYY
H.D.
5
S.O.
7
J34
1
12
K1
HEAT
K3
SIDE
DEM ON
J33
10
8L22-233 Rev 1 (04/03)
J31
1
1
US
C
O
CLAS
S
BACK-UP
TO
TEMPERATURE
CONTROL (OPT)OR NO OPTION
JUMPER BL OCK
J34
LIFT OPTION
TO BASKET
CAN
GB
NONE
NONE
SIDE ON
NONE
24VAC POWER SWITCHED
NONE
J33
11
12
10
DC RETURN
HEAT DEMAND
9
7
5
8
6
HEAT FEED BACK
4
DRAIN OR FLOAT SWITCH
24VACH POWER
24VACN RETURN
2
3
1
K3
SIDE ON
HEAT DEMAND ENABLE
HEAT DEMAND
J32
1
K1
HEAT DEM
SIDE ON
TO HIG H LIMIT
TO RESET SWITCH IF REQUIRED
24VAC RETURN
3
2
K3
5
4
K1
HEAT
DEMAND
J34
HEAT FEED BACK
6
DC COMMON
BASKET LIFT LEFT
BASKET LIFT RIGHT
5
6
4
3
7
Relay Board
24VCOM
5
2
M A
FR
24VA
4
3
21
TRANSFORM ER
AC POWER
60127301
F1
FUSE
J35
24VAC
1
2
J34
SWITCH
TO DRAIN
OR FLOAT
1
DRAIN OR
FLOAT SWITCH
3
24VACH
24VAC RETURN
9
J31
624
(DC)(DC)
HEAT DEMAND
HEAT FEEDBACK
TO
PRIMARY
COOKING
CONTROLLER
10
NONE
578
SIDE ON (DC)
BASKET LIFT L
BASKET LIFT R
24VDC RETURN
9
L22-233 Rev 1 (04/03)
Schematics
L22-233 Rev 1 (04/03)
10
1
2
DRAIN
SWITCH
NO
NC
3
4
5
6
7
ABC
NO
NC
HEAT
FEEDBACK
INPUT
HEAT
DEMAND
CONTACTOR
DE
SIDE ON
CONTACTOR
FGH
24 VAC
INPUT
COMMON
24 VAC
TRANSFORMER
TO TRANSFORMER
COMMON
24 VAC
DVI
INPUT
ON/OFF
(SIDE ON)
OUTPUT
SO HD
SIDE ON
AC
F1 FUSE
24 VAC
COMMON
24 VDC
COMMON
RELAY BOARD
24 VAC +
24 VAC +
PROBE
INPUT
HEAT DEMAND
OUTPUT
HEAT
DEMAND
HI LIMIT
SWITCH
(DOMESTIC
ONLY)
TO HI LIMIT
SWITCH
CONNECTOR
HI LIMIT
RESET
I
J
CE/EXPORT ONLY
1
2
3
4
5
11
6
7
L22-233 Rev 1 (04/03)
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