Vulcan-Hart LG300 User 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.
SERVICE MANUAL
A product of Vulcan-Hart 3600 North Point Blvd Baltimore, MD 21222
F45691 (1117)

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
LG Series Fryer
© VULCAN 2017
F45691 (1117) Page 2 of 23

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
LG Series Fryer - GENERAL
Page 3 of 23 F45691 (1117)

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. 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. 3
4. Reverse procedure to install.
Back Panel
1. Remove rear panel mounting screws.
Fig. 4
2. Reverse procedure to install.
Flue Wrap
1. Remove screws securing flue wrap.
LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS
F45691 (1117) Page 4 of 23

Fig. 5
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
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.
Fig. 7
3. Push up on burner while pulling bottom of burner
forward to clear burner nozzle.
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.
LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS
Page 5 of 23 F45691 (1117)

Fig. 8
5. Remove thermostat mounting screws (Fig. 8)
and bracket.
6. Note and disconnect thermostat wiring.
Fig. 9
7. Loosen packing nut (1, Fig. 10) and remove
holding nut (2, Fig. 10).
Fig. 10
8. Remove thermostat bulb from clamp.
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 .
2. Remove HEAT SHIELD.
3. Remove LEFT BURNER.
4. Remove high limit mounting bracket.
LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS
F45691 (1117) Page 6 of 23

Fig. 12
5. Note wires and disconnect.
Fig. 13
6. Loosen packing nut (1,Fig. 14 ) and remove
holding nut (2, ).
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.
LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS
Page 7 of 23 F45691 (1117)

Fig. 15
2. Note and disconnect thermopile to high limit
switch wiring.
Fig. 16
3. Loosen thermopile holding nut (1, Fig. 17).
Fig. 17
4. Remove thermopile from bracket.
5. Reverse to install.
PILOT
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 HEAT SHIELD.
2. Remove pilot assembly bracket.
LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS
F45691 (1117) Page 8 of 23

Fig. 18
3. Remove pilot nut at bottom of pilot assembly.
Fig. 19
4. Disconnect pilot tubing.
5. Remove THERMOPILE.
6. Remove pilot bracket screws.
Fig. 20
7. Reverse procedure to install.
PILOT ORIFICE
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 HEAT SHIELD.
2. Remove pilot assembly bracket.
LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS
Page 9 of 23 F45691 (1117)

Fig. 21
3. Remove the nut at bottom of pilot to expose the
orifice.
Fig. 22
4. Pull orifice (1, Fig. 23) out and replace.
Fig. 23
5. Reverse procedure to install.
COMBINATION VALVE
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. Disconnect fryer from main gas supply.
2. Remove RIGHT BURNER.
3. Note and disconnect wires (1, Fig. 24) from
combination valve (2, Fig. 24).
Fig. 24
4. Disconnect pilot tubing (3, Fig. 24) from
combination valve.
5. Disconnect combination valve union and
pressure fitting.
LG Series Fryer - REMOVAL AND REPLACEMENT OF PARTS
F45691 (1117) Page 10 of 23