Vulcan-Hart SG7800 User Manual
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.
– 2 –
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
(alternate location is behind the lower front cover attached
to the burner box area). The rating plate states the model
number, serial number and type of gas unit requires.
Motors in Vulcan convection ovens are permanently
lubricated and require no additional maintenance.
– 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.
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.
Complete Shutdown
1. Turn burner valve OFF; pilot will remain lit.
2. Turn main gas supply OFF.
– 5 –
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.
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
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.
Nightly Shutdown
Turn oven burner valve OFF.
Complete Shutdown
1. Turn burner valve OFF.
2. Turn main gas supply OFF.
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.
– 6 –
PILOT BURNER ADJUSTMENTS
H SERIES SERVICE & PARTS
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 1⁄4" 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 appli-
ance 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 1⁄8" 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
– 7 –
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:
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:
Fig. 5
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.
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:
1
⁄4 turn of Screw “A” represents a temperature
shift of 35° F.
Fig. 6
– 8 –
AUTOMATIC SHUTOFF PILOT INSTRUCTIONS
H SERIES SERVICE & PARTS
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.
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 8-1⁄2" 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.
NOTE: Make certain gas line to inlet of control is purged
of air and that gas flow is available at this point.
Fig. 8
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.
– 9 –
Loading...