Vulcan-Hart LG300, LG400, ML-136643, LG500, ML-136258 Service Manual

SERVICE MANUAL

LG Series Fryer

LG300 ML-136528
LG400 ML-136622
LG500 ML-136643

- NOTICE -

This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified.

This manual is not intended to be all encompassing. If you have
not attended a Vulcan Service School for this product, you should
read, in its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
required to perform the procedure. Procedures for which you do
not have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.

The reproduction, transfer, sale or other use of this Manual,
without the express written consent of Vulcan, is prohibited.

This manual has been provided to you by ITW Food Equipment
Group LLC ("ITW FEG") without charge and remains the property
of ITW FEG, and by accepting this manual you agree that you will
return it to ITW FEG promptly upon its request for such return at
any time in the future.

A product of Vulcan-Hart 3600 North Point Blvd Baltimore, MD 21222

F45691 (1117)

LG Series Fryer

TABLE OF CONTENTS

GENERAL .................................................................................................. 3

INTRODUCTION ....................................................................................... 3

INSTALLATION, OPERATION AND CLEANING ......................................................... 3

TOOLS ................................................................................................. 3

SPECIFICATIONS ...................................................................................... 3

REMOVAL AND REPLACEMENT OF PARTS ............................................................... 4

COVER PANELS ....................................................................................... 4

BURNERS ............................................................................................. 5

THERMOSTAT ......................................................................................... 5

HIGH LIMIT THERMOSTAT ............................................................................ 6

THERMOPILE .......................................................................................... 7

PILOT .................................................................................................. 8

PILOT ORIFICE ........................................................................................ 9

COMBINATION VALVE ............................................................................... 10

FRY TANK ............................................................................................ 11

SERVICE PROCEDURES AND ADJUSTMENTS ........................................................... 12

TURNING FRYER OFF ................................................................................ 12

LIGHTING PILOT ..................................................................................... 12

DRAIN FRYER TANK ................................................................................. 13

MILLIVOLT CONTROLS TEST ........................................................................ 13

THERMOSTAT CALIBRATION ........................................................................ 14

PILOT ADJUSTMENT ................................................................................. 14

BURNERS, NOZZLES AND ORIFICES ................................................................ 15

COMBINATION VALVE REGULATOR ADJUSTMENT ................................................. 16

EXTENDED SHUT-DOWN ............................................................................ 17

DIAGRAMS ............................................................................................... 18

SCHEMATIC .......................................................................................... 18

WIRING DIAGRAM .................................................................................... 19

ELECTRICAL OPERATION ................................................................................ 20

CONTROL SYSTEM DESCRIPTION ................................................................... 20

SYSTEM CONDITION QUICK CHECK PROCEDURE .................................................. 20

COMPONENT FUNCTION ............................................................................ 21

TROUBLESHOOTING ..................................................................................... 22

TROUBLESHOOTING ................................................................................. 22

© VULCAN 2017

F45691 (1117) Page 2 of 23

LG Series Fryer - GENERAL

GENERAL

INTRODUCTION

This manual is applicable only to models listed on the
cover page. Procedures in this manual will apply to all
models unless specified. Pictures and illustrations can
be of any model unless they need to be model specific.

INSTALLATION, OPERATION AND

CLEANING

For detailed installation, operation and cleaning
instructions, refer to the Installation & Operation
Manual sent with each unit. The manual is also
available online at www.vulcanequipment.com.

TOOLS

Standard

• Standard set of hand tools.

• VOM with minimum of NFPA-70E CATIII 600V,
UL/CSA/TUV listed. Sensitivity of at least 20,000
ohms per volt. Meter leads must also be rated at
CAT III 600V.

• Temperature tester (thermocouple type).

• ESD (Electrostatic discharge) Protection Kit.

Special

• Manometer.

SPECIFICATIONS

Gas Data

Model No. Tubes BTU/HR

LG300 3 90,000

LG400 4 120,000

LG500 5 150,000

Page 3 of 23 F45691 (1117)

LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS

REMOVAL AND REPLACEMENT OF PARTS

COVER PANELS

Door

Be prepared to catch door when bottom hinge is
removed.

1. Remove door hinge screws while supporting
door.

Fig. 3

4. Reverse procedure to install.

Back Panel

1. Remove rear panel mounting screws.

Fig. 1

2. Reverse procedure to install.

Heat Shield

1. Remove DOOR.

2. Remove heat shield mounting screws.

Fig. 2

3. Angle heat shield to remove.

Fig. 4

2. Reverse procedure to install.

Flue Wrap

1. Remove screws securing flue wrap.

F45691 (1117) Page 4 of 23

LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS

3. Push up on burner while pulling bottom of burner

Fig. 5

forward to clear burner nozzle.

Fig. 7

2. Reverse procedure to install.

Flue Box

1. Remove FLUE WRAP.

2. Remove screws securing flue box.

Fig. 6

3. Reverse procedure to install.

BURNERS

4. Reverse procedure to install.

THERMOSTAT

Oil may be hot when draining fryer tank.

Shut off the gas before servicing the
unit and follow lockout / tagout
procedures.

1. DRAIN FRYER TANK .

NOTE: Steps to remove Heat Shield can be skipped
if back of fryer is accessible. Remove BACK PANEL
to access thermostat probe packing nut.

2. Remove HEAT SHIELD.

3. Remove LEFT BURNER.

4. Pull thermostat knob (1, Fig. 8) off thermostat
shaft.

Shut off the gas before servicing the
unit and follow lockout / tagout
procedures.

1. Remove HEAT SHEILD.

2. Loosen mounting bolts at top of burner being
removed.

Page 5 of 23 F45691 (1117)

LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS

Fig. 10

8. Remove thermostat bulb from clamp.

Fig. 8

5. Remove thermostat mounting screws (Fig. 8)
and bracket.

6. Note and disconnect thermostat wiring.

Fig. 11

9. Remove thermostat assembly.

10. Reverse procedure to install.

Take care not to kink thermostat capillary when
installing. Wrap threads of packing nut with teflon tape
to prevent leakage.

HIGH LIMIT THERMOSTAT

Shut off the gas before servicing the
unit and follow lockout / tagout
procedures.

1. DRAIN FRYER TANK .

Fig. 9

7. Loosen packing nut (1, Fig. 10) and remove
holding nut (2, Fig. 10).

F45691 (1117) Page 6 of 23

2. Remove HEAT SHIELD.

3. Remove LEFT BURNER.

4. Remove high limit mounting bracket.

LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS

6. Loosen packing nut (1,Fig. 14 ) and remove
holding nut (2, ).

Fig. 12

5. Note wires and disconnect.

Fig. 14

7. Reverse procedure to install.

8. Check for leaks.

THERMOPILE

Shut off the gas before servicing the
unit and follow lockout / tagout
procedures.

All gas joints disturbed during servicing must be
checked for leaks. Check with a soap and water
solution (bubbles). Do not use an open flame.

1. Remove pilot assembly bracket.

Fig. 13

Page 7 of 23 F45691 (1117)