Pitco MG14 Service Manual
Service Manual
GAS FRYER with FILTER
MODEL MG14S-C/MFD
MANUFACTURED EXCLUSIVELY FOR
McDONALD'S
®
PITCO FRIALATOR, INC.
P.O.BOX 501 CONCORD, NH 03302-0501
Phone: 1(603)225-6684
Toll Free: 1(800)258-3708
Fax: (603)225-8497
Pitco Frialator
Literature # L20-140 Rev.1 Rev Date January 2002 Made in the United States of America
FOR YOUR SAFETY:
Do not store gasoline or other flammable
vapors or liquids in the vicinity of this or
any other appliance.
TO THE PURCHASER
POST IN A PROMINENT LOCATION INSTRUCTIONS TO BE FOLLOWED IN THE
EVENT THAT AN OPERATOR SMELLS
GAS. OBTAIN THIS INFORMATION FROM
YOUR LOCAL GAS SUPPLIER.
WARNING:
IMPROPER INSTALLATION, ADJUSTMENT,
ALTERATION, SERVICE OR MAINTENANCE CAN CAUSE PROPERTY DAMAGE,
INJURY OR DEATH. READ THE INSTALLATION, OPERATING AND MAINTENANCE
MANUALS THOROUGHLY BEFORE INSTALLING OR SERVICING THIS EQUIPMENT.
the flame burning correctly. If the flame is starved
of air it can give off a dangerous carbon monoxide
gas. Carbon Monoxide is a clear odorless gas that
can cause suffocation.
WARNING
Carbon Monoxide gas can build up if you obstruct
the flue. Blocking the flue will also cause the unit
to overheat. DO NOT obstruct the flow of combustion/ventilation or air opening around the machine.
Ensure that you meet the minimum clearances
specified in the installation instructions. Adequate
clearance around the unit is necessary for servicing and proper burner operation.
WARNING
If the machine should shut down unexpectedly wait
5 minutes before attempting to restart it. This will
allow for any excess gas in the unit to dissipate.
WARNING
The power supply must be disconnected before
servicing or cleaning the unit.
WARNING
This appliance is equipped with a grounding plug.
This is for your protection against shock hazard in
the event of equipment malfunction. Always plug
the unit into a properly grounded receptacle. DO
NOT cut or remove the grounding prong.
WARNING
DO NOT use an open flame to check for gas leaks!
Keep all open flames away from the machine at all
times.
WARNING
Machines equipped with casters and a flexible
power cord, must be connected to a gas supply
with a Quick-Disconnect device. This quick disconnect must comply with ANSI Z24.41. To limit the
movement of the unit without depending on the
connector or quick disconnect, a restraining device must also be installed.
WARNING
There is an open flame inside the machine. The
unit may get hot enough to set nearby materials
on fire. Keep the area around the unit free from
combustibles.
WARNING
Ensure that the machine can get enough air to keep
WARNING
DO NOT supply the fryer with a gas that is not
identified on the data plate, located on the inside
of one of the doors of the machine. If you need to
convert the machine to another type of fuel, contact your dealer or Authorized Pitco Service Agency.
WARNING
To prevent tipping of the machine and splashing of
HOT oil your Pitco Frialator fryer is equipped with
a Gas Hose Quick Disconnect and restraining device. This attaches the rear of the machine to the
wall. When the fryer is in its operating location, lock
the casters and reattach the restraining device to
the rear of the machine.
WARNING
Shortening, when it is at cooking temperatures, is
very HOT and DANGEROUS! Use extreme caution when handling! Use the proper protective gear
such as insulated gloves, aprons, face shield and
sleeves when handling hot shortening. DO NOT
attempt to move any machine that has hot oil in it.
Allow the oil to cool to room temperature or drain
the oil into a suitable container before moving the
fryer.
WARRANTY STA TEMENT
Pitco Frialator, Inc. makes the following limited war ranties to the original purchaser only for this equipment and replacement parts:
1. WARRANTY PROVISIONS - FRYERS
A. Pitco Frialator, Inc. warrants all parts, with
the exception of the frypot, computer, burner
and Heat Tube Baf fle for 1 year after the date
of installation of the fryer.
B. If any parts become defective during the first
year after the installation date, Pitco Frialator will also pay for the labor, freight and
travel costs involved in replacing said part.
2. WARRANTY PROVISIONS - FRYPOTS
A. If a frypot develops a leak due to a defect in
material or workmanship within the first 10
years after installation, Pitco Frialator, Inc.
will either weld or replace, at its discretion,
the frypot.
B. The customer will be responsible for all
freight, labor and travel charges for this repair, except within the period stated in section 1-B.
5. W ARRANTY PROVISIONS - HEA T TUBE
BAFFLES
A. Pitco Frialator, Inc. will warrant the Heat
Tube Baffles from defects in material or
workmanship for a period of 3 years.
B. The customer will be responsible for all
freight, labor and travel charges for this repair, except within the period stated in section 1-B.
Retain this manual for future reference
3. W ARRANTY PROVISIONS - COMPUTER
A. Pitco Frialator, Inc. will warrant the Intelli-
fry Computer from defects in material or
workmanship for a period of two years.
B. If the computer is found to be defective dur-
ing the first 2 years after the installation date,
Pitco Frialator Inc. will also pay for the labor, freight and travel costs involved in replacing said part.
4. WARRANTY PROVISIONS - BURNERS
A. Pitco Frialator, Inc. will warrant the Burners
from defects in material or workmanship for
a period of 10 years.
B. The customer will be responsible for all
freight, labor and travel charges for this repair, except within the period stated in section 1-B.
Table of Contents
WARRANTY STATEMENT
INSTALLATION INSTRUCTIONS .............................................................................. 1
Ventilation ............................................................................................................... 1
A note on Excessive Air Velocities within Hood systems ....................................... 1
Quick Disconnect Gas Connection .......................................................................... 1
Fuel Supply Line Leak and Pressure Testing .......................................................... 2
Clearances ............................................................................................................... 2
Leveling the fryers................................................................................................... 2
Filling the fryer with oil .......................................................................................... 2
Chapter 1: HOW DOES IT WORK? .................................................................................... 3
Heating System ........................................................................................................ 3
Hi - Limit System .................................................................................................... 3
Filter System............................................................................................................ 3
Hood Relay System ................................................................................................. 3
Chapter 2: COMPONENT TROUBLESHOOTING ............................................................ 5
Probe ........................................................................................................................ 5
Relays ...................................................................................................................... 5
Hi Limits .................................................................................................................. 5
Drain Valve & Return Valve Switches ..................................................................... 5
Transformer ............................................................................................................. 6
Blower ..................................................................................................................... 6
Pressure Switch ....................................................................................................... 6
Gas Valve ................................................................................................................. 6
Chapter 3: TROUBLESHOOTING GUIDE ........................................................................ 7
Fryers ....................................................................................................................... 7
Filters ....................................................................................................................... 8
Chapter 4: COMPONENT CHANGEOUT .......................................................................... 9
Probes ...................................................................................................................... 9
Hi Limits .................................................................................................................. 9
Computers ............................................................................................................... 9
Components mounted in the front panel ................................................................. 10
Hood & Filter Relays .............................................................................................. 10
Control Relays ......................................................................................................... 10
Circuit Breaker ........................................................................................................ 11
Gas Valves ............................................................................................................... 11
Burners and Spark Ignitors ...................................................................................... 11
Proximity Switches.................................................................................................. 12
Blowers .................................................................................................................... 12
Pressure Switches .................................................................................................... 12
Fry Vats .................................................................................................................... 13
Chapter 6: PARTS SECTION ............................................................................................... 16
Chapter 7: SCHEMATICS ................................................................................................... 32
INSTALLATION INSTRUCTIONS
CAUTION:
This equipment is manufactured for the use on a
particular type of gas and electrical voltage which
is specified on the rating plate located on the inside of the door.
tional Fire Protection Association, Battery March
Park, Quincy, MA 02269
NOTE: It is recommended that the ventilation system be cleaned and maintained in accordance with
the procedures laid out in the appropriate Preventative Maintenance Card.
When your fryers arrive, look them over carefully
noting any damage on the freight bill. If concealed
damage is found after you have accepted the equipment, report it to the carrier immediately , as all claims
must be filled within 15 days of the receipt of the
shipment. Also, be sure to keep any packing materials as these will be necessary to make a claim.
Follow these installation instructions carefully. A
proper installation is important for the operation of
the fryers.
In the United States, all installations must conform
to all local and state codes and well as the National
Fuel Gas Code (ANSI 223.1 1992). In Canada, installations must be made in accordance to Canadian
Standard CAN 1-B149.1 or .2 “Installation Codes
for Gas Burning Appliances & Equipment.”
Electrically operated appliances must be electrically
grounded in accordance with local codes; or in the
absence of local codes, with the National Electric
Code ANSI/NFPA No. 70-1996; in CANADA, with
CSA C22-1 Canadian Electrical Code Part 1.
A note on Excessive Air Velocities within Hood
systems:
Extended recovery times and flame outage problems
may occur if Hood Air Velocities are excessively
high.
The installation of a small baffle may be necessary
if problems occur.
NOTE: Should you experience a power failure, your
fryers will shut off automatically . If this happens, do
not attempt to restart the fryers until the power is
restored.
Ventilation:
A proper ventilation system is also an important part
of the installation. For information on the construction and installation of ventilating hoods, please see
“Standard for the Installation of Equipment for the
Removal of Smoke and Grease Laden Vapors from
Commercial Cooking Equipment”, N.F .P.A. No. 96-
1987. Copies can be obtained by writing to the Na-
The baffle should be installed in the position shown
in the picture, using two self drilling screws.
Quick Disconnect Gas Connection:
Units equipped with casters must be installed with
connectors that comply with the standards for connectors for Movable Gas Appliances, ANSI Z21.691987, and Addenda Z21.69A-1989. (CAN/CGA -
6.16 and CAN/CGA - 6.9.) This connection should
1
include a quick disconnect device that complies with
the Standard for Quick Disconnect Devices for use
with Gas Fuel, ANSI Z21.41-1989. When installing
a quick disconnect you must also install a means of
limiting the movement of the fryer. This device will
prevent the gas line or quick disconnect from being
strained.
Fuel Supply Line Leak and Pressure Testing:
The fuel supply system must be tested before the
machine can be used. If the fuel line is going to be
tested at a pressure greater than (>)
1
/2 PSI (3.45 kPa),
make
sure that the unit is disconnected from the fuel line.
If the fuel line is going to be tested at a pressure
equal to or less than (≤) 1/2 PSI (3.45 kPa), the machine can be connected to the supply but the gas valve
must be shut.
Clearances:
WARNING:
Area must be kept clear of all combustible
materials.
Minimum clearance of 6" (15cm) must be maintained
from combustible construction on each side and the
rear of the equipment. This equipment may be installed on combustible floors.
Regular cleaning of this equipment, as well as the
hood, is an important part of proper maintenance.
Refer to Maintenance Requirement Cards for proper
procedure and frequency.
Leveling the fryers:
Leveling the fryers will help ensure proper operation. T o level the fryers loosen the two set screws on
the caster stem. Rotate the collar of the caster to raise
or lower the height of the unit. Tighten the set screws
to lock adjustment.
Filling the fryer with oil:
CAUTION:
Never operate this equipment empty . Always make
sure there is the correct amount of shortening or in
the case of cleaning, water in the tank before turning the unit ON.
It is very important to make sure the oil level is correct before attempting to heat shortening in your
Pitco fryer.
Liquid shortening can be poured directly into the fry
tank until the correct level has been reached. This is
indicated by a line on the right or left hand sides of
the inside of the fry tank. "C" is the level for Cold
shortening and "H" is the level for Hot shortening.
Maintain a minimum of 24" (61cm) clearance in front
of the fryer to provide for proper operation, maintenance and servicing.
NOTE: Do not block the area around the bottom or
underneath the fryer. The air required to support the
gas combustion is drawn from the underneath and
sides of the fryer.
A wiring diagram is located in the back of this manual
and inside the fryers.
The control (interlock) voltage for this equipment
must be 120 VAC (US & Canada). For other countries please check the rating plate.
For solid shortening, the shortening must be cut into
small blocks about 1" (2.54 Cm) in size. These small
blocks must be placed under and around the heating
elements.
Clean the fry tanks using the Boil Out procedure on
Maintenance Card Number 14A
Retain this manual for future reference.
2
Chapter 1: HOW DOES IT WORK?
The McDonald's Gas fryer will have certain reactions to what is happening, knowing what these reactions are and knowing what the machine is trying
to do will enable us to diagnose most of the problems likely to be encountered.
Heating System
Power to the machine is turned ON:
The computer is supplied with 24VAC and, if the
Drain Valve Handle is closed, the Proximity Switch
(S3) will supply 24 VAC to the DVI (Drain Valve
Interlock) Input at the computer .
The computer is turned ON:
The first computer in the "battery" of fryers (this includes either side of a split vat) to be turned ON will
energize a Relay (K15) that will turn the Hood system ON.
Computer calls for heat:
The Heat Demand Relay (K1) will energize supplying the Blower, the Pilot Solenoid on the Gas Valve
and the Ignition Control Modules (E1 & E2) with
power . Both Ignition Control Modules supply power
to the Spark Ignitors. At the same time one of the
Ignition Control Modules (E2) supplies power to the
Gas Cut Off Relay (K6). The Gas Cut Off Relay (K6)
energizes allowing the second Ignition Control Module (E1) to supply power to the normally open Pressure Switch (S9). When the Blower comes up to
speed, which should take a couple of seconds, the
Pressure Switch (S9) will close allowing 24 VAC to
the Main Solenoid of the Gas Valve. This will also
supply the computer with a heat feedback signal.
Since there are two burners in a full vat machine
each of the Ignition Control Modules (E1 & E2) alternately sends a spark signal to the Ignitor and tests
for a flame sense signal from the same Ignitor. When
a flame sense signal is received it will cease to send
the spark signal and continue to sense flame. If, after 10 seconds, a flame sense signal has not been
established the Ignition Control Module (E1 & E2)
will "Lock Out" and cease to run until reenergized.
On Split Vat machines the same power that supplies
the computer also supplies 24 VAC to the normally
open Pressure Switch (S9). When the computer en-
ergizes the Heat Demand Relay (K1) the Blower will
be supplied with power and come up to speed. At
this time the air pressure from the blower will close
the Pressure Switch (S9) and allow 24 VAC to go to
the second set of contacts within the Heat Demand
Relay (K1), since the Heat Demand Relay (K1) is
now closed the Ignition Control Module (E1) and
Hi Limit Switch (S1) will receive 24 VAC. If the Hi
Limit Switch (S1)iis NOT tripped it will allow 24
VAC to be supplied to the Pilot Solenoid of the Gas
Valve. The Ignition Control Module (S1) supplies
24VAC to the Main Solenoid of the Gas valve. The
Ignition Control Module (E1) alternately sends a
spark signal to the Ignitor and tests for a flame sense
signal from the same Ignitor. When a flame sense
signal is received it will cease to send the spark signal and continue to sense flame. If, after 10 seconds,
a flame sense signal has not been established the Ignition Control Module (E1) will "Lock Out" and
cease to run until reenergizes.
Hi - Limit System:
When the Hi Limit (S1) trips it causes the power to
the Pilot Solenoid to stop and gas will cease to flow
through the gas valve. This will cause a Lock Out
condition and the computer will show "IGNITION"
"FAILURE". The Hi Limit (S1) is an automatic reset type switch. In order to make the computer recognize that the Hi Limit (S1) has reset it must be
turned OFF and back ON again.
Filter System:
Opening the RED Return Valve Handle will cause
the Pump On Relay to be energized and the pump
will begin to pump. Closing the Return Valve Handle
will de - energize the Relay and the Pump will stop
pumping.
Hood Relay System:
There is one Hood Relay (K15) per "battery" of fryers, it is wired in parallel to every computer (both
sides of a split vat). When any side of any computer
is turned ON this Relay (K15) will energize and will
stay energized until all of the computers are turned
OFF.
3
Full Vat Fryers:
Split Vat Fryers:
4
Chapter 2: COMPONENT
TROUBLESHOOTING:
Probe:
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 values on the chart below .
TEMP RESISTANCE TEMP RESISTANCE
ºF Ohms ºF Ohms
60 139055 330 1192
80 84644 335 1123
100 53146 340 1058
120 34328 345 998
140 22755 350 942
160 15446 355 890
180 10716 360 841
200 7586 365 795
210 6427 370 752
220 5470 375 712
240 4013 380 675
260 2991 385 640
280 2262 390 607
300 1734 395 576
320 1347 400 547
325 1267
lowed at a lower temperature.
Relays:
The Heat Demand and Hood relays are 24VDC relays and will energize when the correct voltage is
supplied to the coil. When energizing, the relay
Switching Contacts will close, thus connecting the
Common and Normally Open terminals. The Hi Limit relay is a 24VAC relay and may be checked in
the same manner as the above relay .
Hi Limits:
A Hi - Limit switch is a normally closed switch until
the temperature at the probe reaches 435ºF ± 15°
(225ºC ± 15º). In order to test this switch it will be
necessary to bypass the Heat Demand Relay . Follow
the Hi Limit testing proceedure outlined on page 8
of the Operating Manual.
WARNING
Do NOT leave the machine during this test. This
test will cause the oil to heat past the normal operating temperature and can cause damage to the
machine and its operator.
If the switch does not trip between the prescribed
limits it is defective and should be replaced. Once
tripped, the switch will not reset until the oil has
cooled to approximately 400°F (204ºC). If the switch
does not reset it is defective.
Drain Valve & Return Valve Switches:
If the probe returns an open circuit or 0 Ohms reading it should be replaced. If the resistance varies more
than 20 Ohms from the above chart when being
checked between 325-375°F (162ºC - 190ºC) the
probe will give a false temperature reading on the
computer and should be replaced. However, it will
continue to operate at a slightly higher or lower temperature. Allow the oil to cool and check the probe
resistance at a lower temperature. As can be seen
from the chart a greater degree of offset can be al-
This switch is a magnetically operated Reed switch.
When the Drain Valve handle is moved to the open
position, the Actuator will move away from the
switch causing the Reed switch to open. When the
Drain Valve is closed the Reed switch will close.
This switch can also be checked with an Ohm meter.
The normal gap between the Actuator and the Sensor switch on the Drain Valve handle is 1/8" - 1/4" (3 6 mm).
5
Transformer:
Transformers are multiple input voltage, 24 volt output voltage and can be checked by reading the input
and output voltages.
Blower:
Check the voltage between the wires going to the
Blower . If 120 VAC is found and the Blower is NOT
turning it is defective.
Pressure Switch:
As the blower speed rises the amount of vacuum on
the suction side of the pressure switch rises past approximately 1.3" WC (0.325 kPa) the Presssure
Switch will close. When the vacuum falls below approximately 0.8" WC (0.2 kPa) the Pressure Switch
will open. With the Blower running, check the IN
and OUT voltage of the Switch. If 24VAC can be
found on one side but NOT the other the Pressure
Switch is defective.
Gas Valve:
The Knob should be in the ON position. Check for
24VAC between the terminals marked MV and MV/
PV and between PV and MV/PV. If voltage IS found
between both of these connections and the Gas Valve
does not open the Gas Valve is defective. If voltage
is NOT present at both of the coils on the Gas Valve,
troubleshoot and repair the machine until voltage IS
present at both coils, retest the Gas Valve as previously described.
6
Chapter 3: TROUBLESHOOTING GUIDE
Fryers:
It is assumed that, before starting any troubleshooting, the power is turned on and the gas lines are connected correctly .
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
Computer does not come on A. Main circuit breaker is turned off A. Locate the correct circuit breaker and
nothing shows in either display B. Fryer fuse is blown turn OFF and back ON again.
C. Transformer B. Check and Replace as needed
C. Check Transformer
Computer heat light comes on A If the oil is hot the Hi Limit may be A. Allow the oil to cool, the Hi Limit will
but burners do not tripped reset itself. Turn the computer OFF and
back ON again to reset the computer.
Computer display shows "OFF" A. Computer A. Switch circuit breaker OFF and ON
and cannot be turned "ON" again to try to reset computer, if this
does not remedy the problem, replace
computer.
Heat Light ON, Computer shows A. Heat Demand Relay A. Check Heat Demand Relay.
"IGNITION" "FAILURE" B. F2 Fuse may be blown B. Check and replace as needed.
C. Blower C. Check and replace as needed.
D. Pressure Switch D. Check and replace as needed.
E. Gas Valve E. Check and replace as needed.
F. Ignition Module (One or both) F. Check and replace as needed.
G. Gas Valve Relay (Full Vat Only) G. Check and replace as needed.
H. Tripped or defective Hi Limit H. Allow the oil to cool, the Hi Limit will
reset itself. Turn the computer OFF and
back ON again to reset the computer.
Check and replace is needed.
No Spark heard, blower IS A. Heat Demand Relay A. Check and replace where needed.
running B. Ignition Control Module B. Check and replace where needed.
C. Spark Ignitor C. Check and replace where needed.
Spark sound can be heard, A. F2 fuse blown A. Check and replace where needed.
Blower NOT running B. Blower B. Check and replace where needed.
C. Heat Demand Relay C. Check and replace where needed.
Spark sound can be heard, A. Ignition Control Module A. Check and replace where needed.
Blower IS running but main B. Gas V alve Relay (Full Vat Only) B. Check and replace where needed.
burners do not run C. Bad Pressure Switch C. Check and replace where needed.
D. Tripped or defective Hi limit D. Check and replace where needed.
E. Gas V alve E. Check and replace where needed.
Burner comes ON for short A. Flame Sensor A. Check and replace where needed.
time, does not come back on B. Ignition Control Module B. Check and replace where needed.
C. Gas Valve C. Check and replace where needed.
Computer controls left side of A. Wiring harnesses attached in wrong A. Remove power to machine, power up
split vat only order again.
Unplug both sides of computer, plug in
right side first then the left side.
7
Filters:
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
Red Return Valve is open but no A . Red Return Valve NOT fully open A. Pull slightly on the Red handle to check
pump sound can be heard B. Filter Circuit Breaker may be tripped that it is fully open.
C. Filter Motor Thermal Overload may B. Locate the circuit breaker and reset.
be tripped C. Push Red reset button located on end of
D. Sensor switch may be loose or bad filter motor .
D. Check that the switch is tight in its
mounting. If switch is bad replace it.
Drain valve is closed and the A. Green Drain Valve is NOT fully A. Apply a little more pressure to the
computer has been reset but Closed Green Handle to check that it is
still shows "DRAINING" or B. Sensor switch may be loose or bad fully closed.
"TURN OFF" B. Check that the switch is tight in its
mounting. If switch is bad replace it.
Drain Valve is OPEN, the oil A. Green Drain V alve is NOT fully open A. Apply a little more pressure to the
is draining slowly or not at all. B. Drain is plugged with debris Green Handle to check that it is fully
closed.
B. Use the Clean Out Rod from inside the
Fry Vat to clear the Drain Valve. If this
NOT clear the blockage, CLOSE the
Green Drain Valve and follow these
instructions for clearing the main drain
line.
CAUTION:
Some HOT oil may still come out when
the cap is removed.
Remove the two screw from the end
cap (Do NOT lose these.) Use the
Clean Out Rod to clear the main drain
tube. Install the end cap along with its
gasket and two screws. Do not
overtighten these screws.
8
Loading...