Vulcan MG12 Service Manual

SERVICE MANUAL

GAS RESTAURANT RANGE

MG 12, 24, 36, 48 AND 60

MODEL

MG12 ML-52549
MG24 ML-52514
MG36 ML-52522
MG48 ML-52523
MG60 ML-52524

MG12

VULCAN-HART COMPANY, P.O. BOX 696, LOUISVILLE, KY 40201-0696, TEL. [phone]

FORM 30837 Rev. A (7-95)

IMPORTANT FOR YOUR SAFETY

THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL GAS
EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD START-UP AND
ADJUSTMENTS OF THE EQUIPMENT COVERED BY THIS MANUAL.

POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THE
EVENT THE SMELL OF GAS IS DETECTED. THIS INFORMATION CAN BE OBTAINED
FROM THE LOCAL GAS SUPPLIER.

IMPORTANT

IN THE EVENT A GAS ODOR IS DETECTED, SHUT
DOWN UNITS AT MAIN SHUTOFF VALVE AND
CONTACT THE LOCAL GAS COMPANY OR GAS
SUPPLIER FOR SERVICE.

FOR YOUR SAFETY

DO NOT STORE OR USE GASOLINE OR OTHER
FLAMMABLE VAPORS OR LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE.

WARNING

IMPROPER INSTALLATION, ADJUSTMENT,
ALTERATION OR MODIFICATION, SERVICE OR
MAINTENANCE CAN CAUSE PROPERTY
DAMAGE, INJURY OR DEATH. READ THE
INSTALLATION, OPERATING AND MAINTENANCE
INSTRUCTIONS THOROUGHLY BEFORE
INSTALLING OR SERVICING THIS EQUIPMENT.

IN THE EVENT OF A POWER FAILURE, DO NOT
ATTEMPT TO OPERATE THIS DEVICE.

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TABLE OF CONTENTS

MG SERIES GAS RESTAURANT MODULAR RANGE MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SERVICE NOTATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

CHECKS AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

ORIFICE SIZE REQUIREMENTS FOR DIFFERENT ELEVATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

PILOT LIGHTING AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Hot Top and Griddle Top Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Open Top Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

GRIDDLE THERMOSTAT ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Bypass Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Temperature Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

REGULATOR CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

REGULATOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

REGULATOR INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

GRIDDLE THERMOSTAT CHECKS AND CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

GRIDDLE THERMOSTAT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

TOP SECTION PILOT CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

TOP SECTION PILOT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

PILOT ADJUSTMENT VALVE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

TOP SECTION BURNER VALVE AND NOZZLE CHECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

TOP SECTION BURNER VALVE AND NOZZLE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

SERVICE AND PARTS INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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MG SERIES GAS RESTAURANT MODULAR RANGE

MODELS

MODEL SUFFIX DESIGNATIONS

S - 12" Griddle Z - 48" Griddle
F - 24" Griddle T - Thermostatic Control
X - 36" Griddle

PL-40044-1

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SERVICE NOTATIONS

1. The procedures outlined in this manual are to be performed only by Vulcan-Hart authorized

service representatives.

2. An authorized Vulcan-Hart service representative is one who is familiar with Vulcan equipment
and who has been endorsed by Vulcan-Hart Company to service the equipment. All authorized
service personnel are required to stock a minimum amount of parts and should be equipped with
a complete set of wiring diagrams, service and parts manuals covering all Vulcan-Hart equipment.

3. For all field conversion service installation procedures, refer to the Installation and Operation
manual (supplied with the equipment).

4. The rating plate, stating model no., serial no., gas type, and voltage, is located on the inside of the
lower kick panel.

5. Use caution when servicing this equipment. Some service testing is required while the range is in
operation. During these test procedures, DO NOT leave the range unattended, and exercise
caution during all testing operations.

WARNING: THE RANGE AND ITS PARTS ARE HOT. BE VERY CAREFUL WHEN OPERATING,
SERVICING OR CLEANING THE RANGE.

SERVICE

CHECKS AND ADJUSTMENTS

The following is a list of simple checks and adjustments. Perform these checks and adjustments for
relevant symptoms before the removal of any major parts or controls. Any service related questions
for these ranges can be answered by contacting Vulcan-Hart Company at the phone number shown
on the front of this manual.

Checks

1. Check the rating plate and verify that the gas type and pressure rating are correct.

2. Ensure that all ranges and main gas supply lines are properly connected.

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Adjustments

1. Legs

Tools Required: Carpenter's level, channel locks.

If the cooked product seems to be lopsided, check the leveling of the modular range. Place a
carpenter's level across the range top and level the range from front to back and from side to side.

To adjust the leveling of the range, tilt the range to one side, and using channel locks, unscrew the
adjustable leg insert as required. Repeat this procedure as necessary for each leg.

2. Pilot Flame Height

Tools Required: Standard flat blade screwdriver.

To adjust pilot flame height of the top burners, locate the pilot adjustment screws found on the front
manifold pipe. It is not necessary to remove the manifold cover, as adjustment access holes have
been provided in the panel. With screwdriver, turn the adjustment screw of the pilot valve
experiencing the pilot flame height problems (Fig. 1). Rotate the screw clockwise to decrease and
counterclockwise to increase the flame height.

Fig. 1

3. Air Shutter Adjustment

Tools Required: Standard flat blade screwdriver.

The efficiency of the top burners depends upon a delicate balance between the air supply and the
volume of gas. Whenever this balance is disturbed, poor operating characteristics and excessive
gas consumption will occur.

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