Vulcan-Hart SG7800 User Manual

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SERVICE AND PARTS MANUAL FOR H SERIES HEAVY DUTY GAS RANGES

FORMERLY 7800 AND SG7800 SERIES

VULCAN - HART COMPANY, P . O . BOX 696, LOUISVILLE, KY 40201 - 0696, TEL. (502) 778 - 2791

FORM 30555 (2-91)

SERVICE & PARTS H SERIES

IMPORTANT

OPERATING, INSTALLING AND SERVICE PERSONNEL

Operating information for this equipment has been prepared for use by qualified and/authorized operating personnel.

All installation and service on this equipment is to be performed by qualified, certified, licensed and/ authorized installation or service personnel, with the exception of any part marked with a in front of the part number.

Service may be obtained by contacting the Factory Service Department, Factory Representative or Local Service Agency.

DEFINITIONS

QUALIFIED AND/OR AUTHORIZED OPERATING PERSONNEL

Qualified or authorized operating personnel are those who have carefully read the information in this manual and are familiar with the equipment’s functions or have had previous experience with the operation of the equipment covered in this manual.

QUALIFIED INSTALLATION PERSONNEL

Qualified installation personnel are individuals, a firm, corporation or company which either in person or through a representative are engaged in, and are responsible for:

1.The installation of gas piping from the outlet side of the gas meter, or the service regulator when the meter is not provided, and the connection and installation of the gas appliance. Qualified installation personnel must be experienced in such work, be familiar with all precautions required, and have complied with all requirements of state or local authorities having jurisdiction. Reference in the United States of America – National Fuel Gas Code ANSI Z223.1 (Latest Edition). In Canada – Canadian Standard CAN/CGA-B149.1 NAT. GAS (Latest Edition) or CAN/CGAB149.2 PROPANE GAS (Latest Edition).

2.The installation of electrical wiring from the electric meter, main control box or service outlet to the electric appliance. Qualified installation personnel must be experienced in such work, be familiar with all precautions required, and have complied with all requirements of state or local authorities having jurisdiction. Reference: In the United States of America – National Electrical Code ANSI NFPA No. 70 (Latest Edition). In Canada – Canadian Electric Code Part 1 CSA-C22.1 (Latest Edition).

3.The installation of steam piping from the source of supply to the service inlet of the appliance. Qualified installation personnel must be experienced in such work, be familiar with all precautions required, and have complied with all requirements of state or local authorities having jurisdiction.

QUALIFIED SERVICE PERSONNEL

Qualified service personnel are those who are familiar with Vulcan equipment who have been endorsed by the Vulcan-Hart Corporation. All authorized service personnel are required to be equipped with a complete set of service and parts manuals and stock a minimum amount of parts for Vulcan equipment.

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H SERIES SERVICE & PARTS

 

 

SERVICE AND PARTS MANUAL FOR

 

H SERIES GAS RANGES

INDEX

 

 

(Formerly 7800 & SG-7800 Series)

 

PLEASE KEEP THIS MANUAL FOR FUTURE REFERENCE

DESCRIPTION

 

PAGE

DEFINITIONS OF PERSONNEL (OPERATING, INSTALLATION & SERVICE)

Inside Front Cover

 

 

 

INDEX

 

3

 

 

 

TROUBLESHOOTING (PROBLEMS AND CAUSES)

 

4

 

 

 

LIGHTING AND SHUTTING DOWN PILOT BURNERS

 

5, 6

 

 

 

PILOT BURNER ADJUSTMENTS

 

7

 

 

STANDARD OVEN TEMPERATURE CONTROL RECALIBRATION

8

 

 

CONVECTION OVEN TEMPERATURE CONTROL RECALIBRATION

8

 

 

 

AUTOMATIC SHUTOFF PILOT INSTRUCTIONS

 

9

 

 

 

REPLACEMENT PARTS LIST AND PHOTOS

 

10-25

 

 

 

REPLACEMENT PARTS DRAWING (INSERT A)

 

17

 

 

 

REPLACEMENT PARTS DRAWING (INSERT B)

 

18

 

 

A rating plate is located on the control panel of this unit

Motors in Vulcan convection ovens are permanently

(alternate location is behind the lower front cover attached

lubricated and require no additional maintenance.

to the burner box area). The rating plate states the model

 

 

number, serial number and type of gas unit requires.

 

 

– 3 –

SERVICE & PARTS H SERIES

TROUBLESHOOTING

PROBLEM

PROBABLE CAUSES

OVEN

 

TOO MUCH BOTTOM HEAT

INSUFFICIENT HEAT INPUT.

 

OVERACTIVE FLUE.

UNEVEN BAKE

TOO LOW TEMPERATURE.

 

IMPROPER OPERATION.

SIDE BURNING

IMPROPER BYPASS SETTING.

 

FLUCTUATING GAS PRESSURE.

 

 

TOO MUCH TOP HEAT

TOO HIGH TEMPERATURE.

 

FAULTY VENTILATION.

 

EXCESSIVE HEAT INPUT.

 

THERMOSTAT NEEDS CALIBRATION.

 

 

UNEVEN BAKE - SIDE TO SIDE

APPLIANCE NOT LEVEL SIDE TO SIDE.

 

OVEN BURNER, BOTTOM OR BAFFLES

 

IMPROPERLY INSTALLED.

 

 

PULLING TO EDGE OF PAN

WARPED PANS.

 

OVEN NOT LEVEL.

 

 

UNEVEN BAKE - FRONT TO REAR

OVERACTIVE FLUE.

 

UNIT NOT LEVEL, FRONT TO BACK.

 

DOOR NOT CLOSING PROPERLY.

 

 

DRIED OUT PRODUCTS

TOO LOW TEMPERATURE.

 

TOO LONG BAKING TIME.

 

THERMOSTAT CALIBRATION.

 

 

PILOT OUTAGE

GAS SUPPLY NOT SUFFICIENT.

 

PILOT FLAME TOO LOW.

 

RESTRICTION IN PILOT ORIFICE.

 

MALFUNCTIONING SAFETY VALVE.

 

CONVECTION OVEN MODELS ONLY:

 

CAVITY LEAKING.

 

GASKET PROBLEMS.

 

SNORKEL® TUBE BLOCKED.

 

BLOWER RUNNING BACKWARDS.

 

 

EXCESSIVE MEAT SHRINKAGE

ROASTING TEMPERATURE TOO HIGH.

 

 

TOP BURNER OPERATION

 

IMPROPER BURNER COMBUSTION

IMPROPER USE, ALLOWING IMPROPER

EXCESSIVE VALVE HANDLE

VENTILATION.

TEMPERATURES

POOR DOOR FIT.

STICKING TOP BURNER VALVES

OVEN DOOR LEFT OPEN.

 

 

POOR IGNITION

INSUFFICIENT INPUT.

 

POOR AIR-TO-GAS ADJUSTMENT.

 

RESTRICTION IN PILOT ORIFICE.

 

RESTRICTION IN MAIN BURNER IGNITION PORT.

 

RESTRICTION IN CONTROL VALVE.

 

RESTRICTION IN GAS ORIFICE.

– 4 –

H SERIES SERVICE & PARTS

LIGHTING AND SHUTTING DOWN PILOT BURNERS

NOTE: All adjustment procedures associated with pilot lighting must be performed by an authorized Vulcan-Hart installation or service person. The bypass (minimum burner) flame adjustment must be made at the time the appliance is installed.

OPEN TOP BURNERS

1.Turn main gas supply ON.

2.Wait 30 seconds, and using a taper, light the open top pilot.

3.If pilot fails to light, turn main gas supply OFF. Wait 5 minutes and repeat the above procedures.

4.Turn one open top burner valve ON to remove air from the remaining unit gas lines. Turn the burner OFF when the gas begins to flow.

Nightly Shutdown

Turn oven burner valve OFF; pilot will remain lit.

Complete Shutdown

GRIDDLE TOPS/HOT TOPS

1.Turn main gas supply ON.

2.Wait 30 seconds, and using a taper, light the griddle pilot.

3.If pilot fails to light, turn main gas supply OFF. Wait 5 minutes and repeat Steps 1 through 3.

4.Turn one hot top or griddle top burner valve ON to remove air from the gas line. Turn burner valve OFF when gas begins to flow.

Nightly Shutdown

Turn burner valve OFF; pilot will remain lit.

Complete Shutdown

1.Turn burner valve OFF; pilot will remain lit.

2.Turn main gas valve OFF.

1.Turn burner valve OFF; pilot will remain lit.

2.Turn main gas supply OFF.

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SERVICE & PARTS H SERIES

LIGHTING AND SHUTTING DOWN PILOT BURNERS (Cont.)

STANDARD OVEN PILOT

NOTE: Before lighting oven, be sure that range top sections have been lit.

1.Open oven door and lift up the pilot lighting hole cover.

2.Light oven pilot by depressing red reset button (Fig. 1) located on the side control panel above the thermostat knob. Light the pilot and continue to hold the reset button in for one minute.

Fig.1

3.If pilot fails to light, turn main gas supply OFF and wait 5 minutes before repeating Steps 1 and 2.

4.After pilot is lit, close lighting hole cover and oven door.

5.Set oven thermostat to desired temperature.

CONVECTION OVEN PILOT

NOTE: Before lighting oven, be sure that range top sections have been lit.

1.Connect unit to the main electrical supply line. Open oven door panel and lift up the pilot lighting hole cover.

2.Turn red gas valve (located behind the control panel) ON, purging the gas line of all air. Turn gas valve and power switch OFF. Close oven door.

3.Light oven pilot by depressing the red pilot reset button (see Fig. 1), and using a taper, ignite the pilot. Hold reset button in for 30 seconds, or until pilot remains lit. Turn gas valve back ON.

4.If pilot fails to light, turn main gas supply OFF. Wait 5 minutes and repeat Steps 2 and 3.

5.After pilot is lit, push the power switch ON and turn the temperature dial to the desired setting.

Nightly Shutdown

Turn power switch OFF and the temperature dial to 0 degrees.

Complete Shutdown

1.Push power switch OFF.

2.Turn red gas valve (located behind the control panel) OFF.

3.Turn main gas supply OFF.

4.Disconnect electrical supply cord.

Nightly Shutdown

Turn oven burner valve OFF.

Complete Shutdown

1.Turn burner valve OFF.

2.Turn main gas supply OFF.

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H SERIES SERVICE & PARTS

PILOT BURNER ADJUSTMENTS

NOTE: All pilot adjustments are to be performed only by certified Vulcan service representatives.

OPEN TOP BURNER PILOT ADJUSTMENTS

TOOLS: Standard screwdriver.

After pilot is lit, turn the open top burner(s) ON. Adjust the flame if necessary. To adjust, rotate the pilot valve adjustment screw provided on the unit manifold pipe. Turn the burner ON; burner flame should appear on the burner head within a second. Rotate the screw clockwise to decrease and counterclockwise to increase the flame.

Check the open top burner nozzle relationship. The burner nozzle should enter approximately 14" inside the burner venturi (Fig. 2).

Pilot Safety Adjustment

With control panel cover removed, light the oven pilot as explained in the oven lighting instructions. If pilot goes out, increase the pilot safety adjustment until the flame completely engulfs the safety device sensing bulb. The safety adjustment screw is located on the safety control below the red button.

Bypass Flame Adjustment (Oven and

Thermostatically Controlled Griddle)

NOTE: This adjustment must be made at time of appliance installation.

Ignite oven/griddle burner pilot. With oven/griddle cold, turn the thermostat dial slowly clockwise until main burner gas is heard snapping ON. Remove the dial. With a screwdriver, turn the bypass adjustment screw (Fig's. 3 & 4) counterclockwise to increase the bypass flame, or clockwise to decrease it, until flame over the entire burner is approximately 18" high. The bypass adjustment screw is located to the left-hand side of the thermostat control for the oven section, and on top of the thermostat control for the griddle. After adjustment has been made, replace dial.

Fig. 2

HOT TOP AND GRIDDLE TOP PILOT

ADJUSTMENTS

TOOLS: Standard flat blade screwdriver.

After pilot is lit, adjust the burner flame, if necessary. This is accomplished by rotating the adjustment screw of the pilot valve located on the manifold pipe. Turn the burner ON; burner flame should appear on the burner head within a second. Rotate adjustment screw clockwise to decrease and counterclockwise to increase the flame.

OVEN ADJUSTMENTS

TOOLS: Standard flat blade screwdriver.

There are two different adjustments to check for in the oven section: pilot safety, and bypass.

Fig. 4

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SERVICE & PARTS H SERIES

TEMPERATURE CONTROL RECALIBRATION

STANDARD OVEN TEMPERATURE CONTROL RECALIBRATION

Field recalibration is seldom necessary and should not be resorted to unless experience with cooking results definitely proves that the control is not maintaining the set temperature. To check oven temperatures when recalibrating, use a Robertshaw Test Instrument or a reliable mercury oven thermometer.

1.Place thermocouple of test instrument or thermometer in the middle of the oven. Close oven door.

2.Light main burner.

3.Turn dial to any temperature setting and allow oven to heat until flame cuts down to bypass. Let cycle several times.

4.After burner has been on sufficiently long enough to cut down the bypass flame, check oven temperature.

The control should be recalibrated if your reading is not with 15° F of the dial setting. If recalibration is required, proceed as follows:

5.Remove dial.

6.With a screwdriver, loosen the two calibration screws (Fig. 5) until calibration plate moves independently of the control.

7.Turn calibration plate until mark corresponding to test instrument or thermometer reading is in line with center of pointer “A” (Fig. 5), and while holding in this position, tighten calibration screws firmly.

8.Replace dial.

9.NOTE: If the above adjustment is prevented by the two loosened calibration screws being in contact with the ends of the screw clearance slots in the calibration plate, remove the screws, and after turning the calibration plate to the proper location, reassemble screws in the other tapped holes designed for them.

Fig. 5

CONVECTION OVEN TEMPERATURE CONTROL RECALIBRATION

1.Place thermocouple of test instrument in middle of oven. Close oven door.

2.Light the main burner by turning thermostat dial to any temperature setting.

3.Allow oven to heat until flame cuts off. After several

cycles, check temperature. If the temperature does not read within 15° F of the dial setting, recalibrate as follows:

4.Pull dial straight off dial shaft without turning (Fig. 6).

5.Turn screw “A” clockwise to decrease temperature and counterclockwise to increase temperature (Fig. 6).

NOTE: 14 turn of Screw “A” represents a temperature shift of 35° F.

Fig. 6

– 8 –

Vulcan-Hart SG7800 User Manual

H SERIES SERVICE & PARTS

AUTOMATIC SHUTOFF PILOT INSTRUCTIONS

CLEANING

To clean limiting orifice (Fig. 7), turn gas supply to unit OFF. Disconnect pilot tubing at the pilot burner body. The orifice is then accessible at the body end of the pilot burner and can be removed for cleaning. Clean spud, taking care not to enlarge the orifice hole.

Fig. 7

SERVICE INSTRUCTIONS (Fig. 8)

1.If valve fails to open with good pilot flame impingement, replace valve.

2.Do not remove interrupter valve for field service.

NOTE: Make certain gas line to inlet of control is purged of air and that gas flow is available at this point.

THERMOSTATICALLY CONTROLLED GRIDDLE RECALIBRATION

Field recalibration is seldom necessary and should not be resorted to unless cooking results definitely prove that griddle surface temperature and thermostat setting do not agree. To check griddle temperature, use an accurate “surface temperature thermometer” in the following manner.

1.Locate thermometer in center of griddle from front to rear: on 17" wide units, use one thermometer and center from side to side; on 34" wide units, use two thermometers, one 8-12" from each side of the griddle.

2.Set thermostat dial to any temperature and allow griddle to heat thoroughly. When the griddle is completely heated and the burner is on bypass gas, check the thermometer reading against the thermostat

dial setting. If the difference between the readings exceeds 15° F, the thermostat should be recalibrated. Example: With the thermostat dial at 400° F and a thermometer reading of less than 385° F or more than 415° F, the thermostat should be recalibrated.

Recalibration Procedure

Make note of number of degrees thermostat is off. Remove thermostat dial and loosen calibration screws (Fig. 9) until plate moves freely. Turn calibration plate the required number of degrees counterclockwise if the thermometer reading was higher than the dial setting, or clockwise if the thermometer reading was lower than the dial setting. Hold calibration plate in desired position and tighten plate screws firmly. The number of degrees between letters on the calibration plate is 50° F.

Fig. 8

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