Magikitch'N MKGD24 Service Manual

IMPORTANT FOR FUTURE REFERENCE

Please complete this information and retain this manual
for the life of the equipment:

Model #: ___________________________
Serial #: ___________________________
Date Purchased: ____________________

ENGLISH

Technical Service Manual

Models

MKG/MKH/MKGD

24,36,48,60 & 72

All Options

Solid State Thermostat Model Shown

S

I

E

G

D

N

D

C

E

E

I

R

F

T

I

CIRET IFED

L22-362 Rev 2 (11/12)

Technical Service Manual
MKG/MKH/MKGD Series Gas Griddles

WARNING

DO NOT store or use gasoline or other flammable
vapors and 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 appliance.

WARNING

Installation, maintenance and repairs should be
performed by a MagiKitch’n Authorized Service and
Parts (ASAP) company technician or other qualified
personnel. Installation, maintenance or repairs by an
unauthorized and unqualified personnel will void the
warranty.

WARNING

Installation and all connections must be made according
to national and local regulations and codes in force.

WARNING

During the warranty period if a customer elects to use a
non-original part or modifies an original part purchased
from MagiKitch’n and/or its Authorized Service and
Parts (ASAP) companies, this warranty will be void. In
addition, MagiKitch’n and its affiliates will not be liable
for any claims, damages or expenses incurred by the
customer which arises directly or indirectly, in whole or
in part, due to the installation of any modified part
and/or received from an unauthorized service center.

WARNING

This appliance, when installed, must be electrically
grounded in accordance with local codes, or i n the
absence of local codes, with the National Electrical
Code, ANSI/NFPA 70, or the Canadian Electrical Code,
CSA C22.2, as applicable.

WARNING

Adequate means must be provided to LIMIT the
movement or this appliance without depending on the
gas or electrical cord connection. Single appliances
equipped with legs must be stabilized by installing
anchor straps. All appliances equipped with casters
must be stabilized by installing restraining chains.

WARNING

An appliance 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.

WARNING

DO NOT alter or remove structural material on the
appliance to accommodate placement under a
ventilation hood.

WARNING

This appliance is intended for professional use only and
should be operated by fully trained and qualified
personnel.

WARNING

If the appliance is equipped with a power cord and it is
damaged, it must be replaced by a MagiKitch’n
Authorized Service and Parts (ASAP) company
technician, or a similarly qualified person in order to
avoid a hazard.

WARNING

The power supply must be disconnected before
servicing, maintaining or cleaning this appliance.

WARNING

The appliance is NOT jet stream approved. DO NOT
clean the appliance with a water jet.

WARNING

DO NOT attempt to move this appliance or transfer hot
liquids from grease box to another container when the
unit is at operating temperature or filled with hot liquids.
Serious personal injury could result if skin comes in
contact with the hot surfaces or liquids.

WARNING

DO NOT sit or stand on this appliance. The appliance’s
front panel, cook plate, splash back, sides, workshelf is
not a step. Serious injury could result from slipping,
falling or contact with hot surfaces or hot liquids.

WARNING

NEVER use the appliance as a step for cleaning or
accessing the ventilation hood. Serious injury could
result from slips, trips or from contacting hot surfaces
or liquids.

WARNING

This appliance is intended for indoor use only.

WARNING

DO NOT operate appliance unless all panels and access
covers are attached correctly.

WARNING

It is recommended that this appliance be inspected by a
qualified service technician for proper performance and
operation on a yearly basis.

WARNING

There is an open flame inside this appliance. The unit
may get hot enough to set nearby materials on fire.
Keep the area around the appliance free from
combustibles.

WARNING

DO NOT supply the appliance with a gas that is not
indicated on the data plate. If you need to convert the
appliance to another type of fuel, contact your
equipment dealer or a MagiKitch’n Authorized Service
and Parts (ASAP) Company.

WARNING

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

WARNING

If gas flow to appliance is interrupted, or pilots
extinguish, wait 5 minutes before attempting to relight
the pilot to allow any residual gas in appliance to
dissipate.

WARNING

Ensure that the appliance 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.

Page 2 L22-362 Rev 2 (11/12)

Technical Service Manual

MKG/MKH/MKGD Series Gas Griddles

TABLE OF CONTENTS

OVERVIEW ................................................................................................................................... 4

1.1 INTRODUCTION.................................................................................................................................. 4

1.2 S

2 THEORY OF OPERATION .................................................................................................... 5

2.1 HEATING SYSTEM –SNAP ACTION SERIES .......................................................................................... 5

2.2 H

2.3 TEMPERATURE CONTROL SYSTEMS ................................................................................................... 6

3 TEMPERATURE CALIBRATION .......................................................................................... 6

3.1 TEMPERATURE MEASUREMENT: .......................................................................................................... 6

3.2 CALIBRATION PROCEDURES: .............................................................................................................. 7

4 COMPONENT CHECK & REPLACEMENT .......................................................................... 8

4.1 DISASSEMBLY OF FRONT PANELS ...................................................................................................... 8

4.2 PILOT / IGNITION SYSTEM CHECK ....................................................................................................... 9

4.3 IGNITION MODULE REPLACEMENT .................................................................................................... 12

4.4 PILOT ASSEMBLY REPLACEMENT ..................................................................................................... 12

4.5 B

4.6 ORIFICE/FUEL TYPE CONVERSION ................................................................................................... 13

4.7 MAIN BURNER REPLACEMENT ......................................................................................................... 13

4.8 GAS PRESSURE ADJUSTMENT ......................................................................................................... 14

4.9 TEMPERATURE CONTROLS CHECK ................................................................................................... 15

4.10 TEMPERATURE CONTROL REPLACEMENT .......................................................................................... 17

4.11 SAFETY VALVE REPLACEMENT ........................................................................................................ 19

4.12 SOLENOID VALVE REPLACEMENT- .................................................................................................... 19

4.13 POWER SUPPLY TRANSFORMER MATCHLESS MODELS “E” & “ST” ..................................................... 21

4.14 SWITCH AND LAMP REPLACEMENT ................................................................................................... 22

PECIFICATIONS ............................................................................................................................... 4

1.2.1 Gas Information ...................................................................................................................................... 4

1.2.2 Elevation Orifice Chart ........................................................................................................................... 4

EATING SYSTEM –MATCHLESS IGNITION SERIES (E / ST) .................................................................. 5

3.2.1 Snap Action and Matchless (E) Series ................................................................................................... 7

3.2.2 Matchless (ST) Series ............................................................................................................................ 7

4.1.1 Snap Action Series ................................................................................................................................. 8

4.1.2 Matchless Series (E & ST) ..................................................................................................................... 8

4.2.1 Ignitor Check- Snap Action Series .......................................................................................................... 9

4.2.2 Spark Failure- Matchless (E & ST) Series ............................................................................................ 10

4.2.3 Insufficient or Absence of Flame: ......................................................................................................... 11

4.2.4 Pilot Lock-in: Snap Action Series ......................................................................................................... 11

4.2.5 Pilot Lock-in- Matchless Series (E & ST) .............................................................................................. 12

URNER ADJUSTMENTS .................................................................................................................. 12

4.6.1 Changing Burner Orifice ....................................................................................................................... 13

4.9.1 Snap-Action Models ............................................................................................................................. 15

4.9.2 Matchless “E” Models ........................................................................................................................... 15

4.9.3 Matchless “ST” Models ......................................................................................................................... 16

4.9.4 Temperature Probe Check: .................................................................................................................. 16

4.9.5 Resistance Chart: Solid State Thermistor Probe .................................................................................. 17

4.10.1 Snap Action Models ............................................................................................................................. 17

4.10.2 Matchless “E” Models ........................................................................................................................... 17

4.10.3 Matchless “ST” Models ......................................................................................................................... 18

4.10.4 Thermistor Probe Replacement............................................................................................................ 18

4.12.1 Pilot Solenoid Valve ............................................................................................................................. 19

4.12.2 Main Burner Solenoid Valve ................................................................................................................. 20

4.13.1 Power Supply Transformer Check ........................................................................................................ 21

4.13.2 Power Supply Transformer Replacement ............................................................................................. 21

5 TROUBLESHOOTING GUIDE ............................................................................................. 23

5.1 TROUBLESHOOT GUIDE -SNAP ACTION MODELS ............................................................................... 23

5.2 T

5.3 SCHEMATIC: MATCHLESS “E” SERIES ............................................................................................... 25

5.4 S

5.5 S

5.6 SCHEMATIC: MATCHLESS SINGLE POWER SWITCH “ST” SERIES ........................................................ 28

L22-362 Rev 2 (11/12) Page 3

ROUBLESHOOT GUIDE - E / ST SERIES ........................................................................................... 24

CHEMATIC: MATCHLESS “ST” SERIES ............................................................................................ 26

CHEMATIC: MATCHLESS SINGLE POWER SWITCH “E” SERIES .......................................................... 27

Technical Service Manual

A

A

r

MKG/MKH/MKGD Series Gas Griddles

1 Overview

1.1 INTRODUCTION
All models

 All models are equipped with pilot safety

system, spark enabled pilots, temperature
controls for each 12” zone, heated by two
burners. Temperature sensing probes are
embedded into the plate between each pair of
burners.

 MKG/MKH/MKGD Series appliances may

have suffixes that denote the following:

 Numerals 24, 36, 48, 60, and 72 denote the

width of the appliance in inches.

 Suffix “L”, “R” and “B” denote left, right and rear grease troughs, respectively.
 Important information located on Data Plate, See Figure 1 at right.

Snap Action Models

 Snap Action models have gas safety valves, Piezo pilot ignition systems and snap action gas

temperature controls.

 Snap Action models have no suffix designation.
 Snap Action models require no external electrical supply.

Matchless Models

 Letter designations represent matchless ignition (flame proving spark ignition), temperature control

options and grease chute options.

 Suffix “E” models have flame proving spark ignition systems and electro-mechanical thermostats.

External power supply is required.

 Suffix “ST” models have flame proving spark ignition systems with solid state temperature controls.

External power supply required.

 Matchless models have 120 Vac 60HZ electrical supply, and 24 Vac control circuitry.

Installation, Operation and Cleaning

 A qualified person, in accordance with all national and local codes, must perform the installation.

Detailed instructions are in the INSTALLATION & OPERATION manual supplied with the appliance.

1.2 SPECIFICATIONS

1.2.1 Gas Information

 Gas supply line must be ¾ “ minimum, providing line pressures at least 1.0” (25mm) greater

than the specified griddle manifold pressure with all burners operating

Gas Type

Natural 15,000 (4.4) 13,333 (3.9) 18,000 (5.3) 4.0" WC (10.1cm) [10 mbar] 5.0" WC (12.7cm) [12.5 mbar]

Propane 15,000 (4.4) 13,333 (3.9) 18,000 (5.3) 10.0" WC (25.4cm) [25 mbar] 11.0" WC (27.9cm) [27.4 mbar]

1.2.2

Gas Type Model Sea level 2000 Ft. 3000 Ft. 4000 Ft. 5000 Ft. 6000 Ft. 7000Ft. 8000 Ft. 9000 Ft. 10,000 Ft,

Natural

MKGD

Propane

MKGD

Elevation Orifice Chart

MKG
MKH

MKG
MKH

BTU/hr(kW) per Burne

MKG MKH

49 50 50 50 51 51 51 52 52 52

0.066"0.066"5152525253535354
45 46 47 47 47 48 48 49 49 50

1.15mm 1.15mm 1.15mm 57 57 57 58 59 59 60
57 58 59 59 60 60 61 62 63 63

1.25mm 1.25mm 1.25mm 57 57 57 58 59 59 60

MKGD

Electrical Information

Snap Action models require no electrical supply. All Matchless Series (-E and -ST) require 115v/60hz/1ph
electrical supply. The appliance is fitted with a grounded 15-amp cord and plug (NEMA 515-P).

REMOVE

GREASE BOX

DATA PLATE

ON INSIDE WALL

.

Manifold Pressure Nominal Supply Pressure

ll Models

ll Models

Page 4 L22-362 Rev 2 (11/12)

Technical Service Manual

MKG/MKH/MKGD Series Gas Griddles

2 Theory Of Operation

This section will demonstrate the basic sequence of
operation for Snap Action and Matchless (E/ST)
Ignition series.

2.1 HEATING SYSTEM –SNAP ACTION
SERIES

 Pilots are lit by, (See Photo 1):

- Opening the shut off valve (C)

- Depressing the Piezo spark buttons (A)

while depressing and holding the button on
the safety valve (B) to ignite flame at pilot.

- Once ignited, keep button (B) depressed
for 20 seconds to lock in the safety valve.

2.2 HEATING SYSTEM –MATCHLESS
IGNITION SERIES (E / ST)

 Start up of Unit, (See Photo(s) 2, and 2a):

- Open the shut off valve (C)

- Pres s Rocker Switch (A), to ON (I) for

each 12” zone to ignite pilots.

- Set thermostat controls (B) to set point

 When the appliance is plugged in, line voltage

is supplied to an 80 VA transformer located in
the power supply boxes located in the rear of
the unit. The transformer then supplies 24
VAC to the rocker switches for the control
circuitry, the switches are located on the
control panel, centered on each 12” zone.

 The rocker switches (A) are double pole (DP).

Photo 1

 Once safety valve is locked in, the "snap acting”

gas thermostats supply gas to their respective
burners upon “call for heat “.

 The thermostats cycle gas to the

burners to maintain cooking surface
temperatures at set point.

 On snap action models the burner operating

pressure is measured at the pressure tap on
the shut off valve (C), and controlled by the gas
regulator (D), mounted in the back of the unit,
See Photo 1a.

Photo 2

One set of contacts supplies power to the
ignition modules (and to the Solid State
temperature control boards on -“ST” Series).
The second set of contacts switches power
from the thermostat control (B), to the main
gas valve solenoids allowing gas to the main
burners.

 The ignition modules supply spark energy to

the ignitor electrodes and power to the pilot
gas valve solenoids to establish pilot flames.
The modules also rectify pilot flame by means
of integral flame sense (spark and flame sense
supplied through the ignition wire).

Photo 1a

Photo 2a

L22-362 Rev 2 (11/12) Page 5

Technical Service Manual
MKG/MKH/MKGD Series Gas Griddles

Photo 2b

 Once pilots ignite, the ignition modules will

send power to the burner valves, traveling first
through the thermostat control, then through the
second contacts of the rocker swit ches.

 The Solid State temperature controls or the

Electric thermostats, cycle the power to
maintain set temperature.

 Supply line gas pressure on matchless models

is measured at the pressure tap on the shut off
valve (C), mounted in the back of the unit,
accessible from the back of the appliance only,
See Photo 2a.

 Matchless models the burner operating

pressure is measured at the pressure tap (E)
on the burner supply line, and controlled by the
gas regulator (D), See Photo(s) 2a.(rear view)
and 2b (front view). The Pressure tap and
regulator adjustment are front accessible with
the lower panel removed, see section 4.

2.3 TEMPERATURE CONTROL SYSTEMS

 Snap action appliances have bulb and capillary

style “Gas Operated” thermostats. The
thermostat has a temperature range of 200° to
450°F, See Photo 3.

 Electric thermostat (-E) models have a bulb and

capillary style “Electro-mechanical Operated”
thermostats. The thermostat has a temperature
control range of 200° to 550°F, See photo 4.

Photo 3

Photo 4

Photo 5

 The Solid State (-ST) model has temperature

control system consisting of a solid state
board, and a Thermistor probe. The sensing
probe is connected to the control board via
“push-on” terminals. The control has a
temperature range of 150° to 550°F, See
Photo 5.

Notice:

Matchless Ignition (E/ST) models have flame

proving park ignition systems. An external power

supply is required on these models.

Notice:

The sensing bulbs or Thermistor probes for each

of the controls are embedded in a slot on the

underside of the cooking surface. The Snap-Action

and Electric thermostat bulbs are “pressed” into

the slot. The Thermistor probe is “inserted” into a

hole at the end of the slot.

3 Temperature Calibration

Each temperature control operates a twelve- (12)
inch zone. Each zone consists of two burners
(except for zones containing a left or right grease
chute/trough). There are three different control
options as noted in Section 2.3. The controls are
factory set. However, if the cooking surface
temperature varies greatly from the setting on the
thermostat knob, adjust the thermostat using the
following procedure:

3.1 TEMPERATURE MEASUREMENT:

Using a calibrated instrument with a surface probe,
measure the temperature in the center of each
zone, 12” in from the front edge of the cooking
surface. The zone centers are located side to side
by the following: (1) Matchless ignition I/O
switches, (2) Snap-Action thermostat knobs, or (3)
Arrows located on the griddle front top rail. The
zone should run at set temperature for at least 30
minutes to allow the zone to stabilize prior to the
calibration check. The temperature will vary with
burner cycling but should stay within +/- 15° F of
the knob setting. The thermostat knob should
indicate the average temperature of the
corresponding zone. If adjustment is required,
follow the instructions in Section 3.2 for the control
type in use.

Page 6 L22-362 Rev 2 (11/12)

Technical Service Manual

MKG/MKH/MKGD Series Gas Griddles

3.2 CALIBRATION PROCEDURES:

3.2.1 Snap Action and Matchless (E) Series

 Light pilots as described in section 2.1.
 Set thermostat knobs to the desired

Photo 6

temperature and allow cooking surface to
stabilize for 30 minutes (1 hour if cold).

 Remove the knob to expose the screw in the

center of the thermostat shaft. Do not allow
thermostat shaft to turn. For snap action
thermostat knobs refer to section 4.1.1. For
electric thermostat (E Series), remove knob by
pulling straight off thermostat shaft.

 Remove any sealant over the head of the screw

with the tip of your screw driver.

 Tightly hold the thermostat shaft (A) and turn

the adjustment screw (B) in small increments to
shift temperature (1/4 turn is approximately
30°F.). To increase temperature, turn the screw
counter-clockwise, or to reduce temperature
turn screw clockwise.

 Snap Action thermostat, See photo 6.

Photo 7

 Electric thermostat, (E Series), use same

sequence as Snap Action thermostat. Electric
thermostat appliances DO NOT

have a

temperature indicator label.

Photo 8

 Check temperature after 15 minutes. Repeat

procedure until all zones are maintaining the
correct temperature.

3.2.2 Matchless (ST) Series

 Turn on all power switches.
 Set knobs to the desired temperature.
 Allow appliance to stabilize for 30 minutes (1

hour if cold).

 Carefully remove knob cap (A), See Photo 7.
 Hold knob firmly in place and loosen the 5/16”

retaining nut (A) with an appropriate socket or
nut driver (B), See Photo 8.

NOTE: Do not remove the knob.

 Once the retaining nut is loose, pull straight

out on the knob to insure that the knob can
move freely on the shaft.

 Align the white indicator line with the average

temperature of the corresponding cooking
zone.

 Hold knob firmly on shaft, while retightening

the retaining nut (A), do not allow knob or shaft

to move or temperature setting will not be
accurate.

 Replace knob cap as seen in Photo 7, the

white indicator lines on the cap and knob
should line up with each other.

NOTE:

Diagrams or photos may have some parts or

details removed for clarity. Actual appliances

may appear differently.

L22-362 Rev 2 (11/12) Page 7

Technical Service Manual
MKG/MKH/MKGD Series Gas Griddles

4 Component Check & Replacement

With the exception of calibration, appliance control
checks or replacement May
control cover front panels. The front panels are
removed as follows:

require removal of the

Photo 9

4.1.2 Matchless Series (E & ST)

 To remove the left lower panel (A), remove the

grease box from the appliance. Then remove
two (2) 10-24 truss head screws (B) from the
inner flange, See Photo 11.

Photo 11

 To remove the right lower panel (C), remove

the two (2) 10-24 truss head screws (B) that
secure it to the inner flange. With the
mounting screws removed, the left and right
lower panels swing away from the appliance
and will release from the retaining clips, See
Photo 12.

Photo 10

4.1 DISASSEMBLY OF FRONT PANELS

4.1.1 Snap Action Series

 Remove all thermostat knobs by loosening the

shaft retaining (set) screws (A), located in the
bottom of the knob, See Photo 9.

 Remove all #10 self threading screws (B),

 With the lower panels removed from the

appliance you will have access to the gas
valves, ignition modules, and temperature
controls.

Photo 12

holding the upper control panel (C) in place.

 Lower door panel(D) rotates down to allow

access to gas train components.

 Slowly pull front panel away from front of

appliance and place in a safe location. Be
careful not damage the Piezo ignition wire as it
will still be attached at this step.

 See Photo 10, Using needle nose pliers,

carefully disconnect the Piezo ignition wire(A),
from the Piezo ignitor assembly(B). The upper
panel is now disassembled from the appliance.

Photo 12a

Page 8 L22-362 Rev 2 (11/12)

Technical Service Manual

MKG/MKH/MKGD Series Gas Griddles

 To remove the upper switch panel, remove the

#10 self threading screws,(D in Photo 12a),
similar to those of the snap action panel. This
will give access to the burner manifolds.

 Verify both terminal connections of the ignition

wire, (A, in Photo 10), and check the wire for
visible damage and electrical continuity.

Note: Front panel must be “grounded” to the

appliance to establish sufficient spark

 Check to ensure that the Piezo ignitor, (B, in

Photo 10). is tightly mounted to the panel. A
loose connection may create an open
“ground”.

 Inspect the electrode(B), and the ceramic

insulator(E) for visible damage, See Photo 14.

 Verify the spark gap between the electrode(B),

and the pilot hood(A), nominal gap is .090”.

Photo 12b

 The panel will be loose, but there will wire

harness connections that may need to be
disconnected to put the panel aside for further
service, the 9 position plug(s) connect the
switch panel to the gas valve assemblies, and
the 6 position plug(s) connect the switch panel
to the thermostat controls, See Photo 12b.

Important!

Carefully support switch panels so wiring

connections will not be strained. Failure to

comply may cause wiring damage.

 Remove the temperature control mounting

panel by removing the four (4) 10-24 truss head
screws, see photo 13.

Photo 14

 If all parts are in good condition, check for

sufficient spark by first removing the ignition
wire,(C) from the electrode terminal.

 Hold the “open” terminal of the ignition wire

1/8” from front panel with insulated pliers, and
depress the red button of the Piezo ignitor.
Check for a visible spark to the panel, See
Photo 15.

 If no spark is produced, replacement of the

Piezo ignitor may be required.

Photo 13

 To replace the piezo igniter, remove the

ignition wire from the igniter and set aside.
Remove the igniter from the panel by

 Disconnect all wiring harness’ and place both

loosening the igniter retaining nut.

the switch panel, and the control panel in a safe
location so they will not become damaged.

 Once the panels have been disassembled from

the unit, there will be access to the gas valves,
pilots, fuse(s), and ignition modules.

4.2 PILOT / IGNITION SYSTEM CHECK

4.2.1 Ignitor Check- Snap Action Series

 Verify actuation of Piezo ignitor by depressing

red button on front panel, (A in Photo 1). A loud
“click” or “snap” sound should be detected.

Photo 15

L22-362 Rev 2 (11/12) Page 9