Southbend CO-300HT-94A Service Manual

southbend

WENDY'S RANGE

$18.00

TECHNICAL MANUAL

WENDY'S RANGE

MODEL: C0300HT AND C0301 HT

A MIDDLEBY COMPANY

This manual is intended for the use of Southbend Authorized Service Agencies and their
associates.

Service work should be performed only by a qualified technician who is experienced in, and
knowledgeable of, the operation of commercial gas, electric, and steam cooking

Improper installation, service, or maintenance can cause property damage,

1100 Old Honeycutt Road • Fuquay-Varina, NC 27526 • [phone] • FAX [phone] • [phone]

Middleby Corp. Service Hot Line [phone] (after hours)

WARNING

injury or death.

(MANUAL SECTION RR)

NOTICE

OR

1

Specifications

..

..............

.......................

....................................................................................................

2-3

Troubleshooting ........................................................................................................................................

8-9

Parts List

..................

................................................................................................................................

13-28

southbend

A

1100

Old Honeycutt Road

Warranty will be void and the manufacturer is relieved of all liability if:

(A) Service work is performed by other than a qualified technician.
(B) Other than genuine Southbend replacement parts are installed.

TABLE OF CONTENTS:

Location of serial and identification name plates:
The serial plate with all specifications is located below the oven door, behind the kick panel, attached to the frame base of the oven. There is also

a product identification plate that has only the model and serial number attached to the front left corner of the valve panel.

FOR INSTALLATION AND OPERATION INSTRUCTIONS - CONSULT OPERATOR'S MANUAL

Safety Precautions ..................................................................................................................................

Adjustments.............................................................................................................................................. 4-7

Performance Spec & Performance Check ............................................................................................... 10

Electrical Schematic Drawings ................................................................................................................. 11-12

SAFETY PRECAUTIONS

The following symbols, found throughout this manual, alert you to potentially dangerous conditions to the operator, service
personnel, or to the equipment.

DANGER
WARNING

CAUTION

NOTICE

MIDDLEBY COMPANY

This symbol warns of immediate hazards which will result in severe injury or death.
This symbol refers to a potential hazard or unsafe practice which could result in injury or

death.
This symbol refers to a potential hazard or unsafe practice which could result in injury,

product, or property damage.
This symbol refers to information that needs special attention or must be fully understood,

even though not dangerous.

Fuquay-Vanna. NC 27526
[phone]
FAX [phone]
[phone]

PAGE 1

NOTE: Not for Scale. For Dimensional Purposes Only.

WENDY'S GAS RANGE WITH CONVECTION OVEN MODEL CO-301HT-94A

RANGE

Required operating pressure: Natural Gas

7-8"

W.C.

than

3/4"

I.D.

TOP VIEW

FRONT VIEW

SIDE VIEW

DIMENSIONS: ( ) = Millimeters

MODEL

WENDY'S

GAS

RANGE

EXTERIOR fl" GAS CONN. ELECTRIC

A

B

Width

Depth

36.5" 41.00" 8" 30" 29.375" 4.250" 5" 45.5" 11.875" 28.750" 6" 9.500" 36" 12.5" 4.5" 36" 15.5" 13.5"

(927) (1042) (203) (762) (746) (108) (127) (1156) (302) (730) (152) (241) (914) (315) (115) (914) (394) (345)

C D E F G H I J K L M N 0

Cook

Door

Top

Opening

P

Oven

Bottom

Q

R

MODEL

WENDY'S

GAS

OVEN INTERIOR

Width Depth Height Hot Top Oven Griddle Width Depth Height

26.125"

(664)

21.75"

(552)

14.25"

(362)

BURNERS (BTU each)

1

(20,000)

(25,000) 2 (30,000)

CRATE SIZE

1

55"

(1397)

45.5"

(1156)

45"

(1143)

Cubic

Volume

118 cu. ft.

3.33 cu. m.

Crated
Weight

705 lbs.

317kg.

UTILITY INFORMATION:

GAS­Total 105,000 BTU. One 3/4" flex hose male connection.

(For location, see drawing above items "L" and "M").

Natural

Propane Gas 11-12" W.C.
Incoming gas line and connections must not be smaller

Propane

PAGE 2

ELECTRIC -
STANDARD: 115/60/1 - furnished with 5 ft. cord with 3-prong

OPTIONAL: 208/60/1 or for use on 3 (190 to 219 volts) - supply

OPTIONAL: 340/60/1 or for use on 3 (220 to 240 volts) - supply

plug. Total maximum amps 6.2.

must be wired to junction box with terminal block
located at rear. Total maximum amps 4.0.

must be wired to junction box with terminal block
located at rear. Total maximum amps 4.0.

Depth

NATURAL

PROPANE

Incoming gas line and connections must not be smaller

rear. Total maximum amps

4.0.

NOTE: Not for Scale. For Dimensional Purposes Only.

WENDY'S CHILI RANGE WITH CONVECTION OVEN MODEL CO-300HT-94A

TOP VIEW FRONT VIEW SIDE VIEW

DIMENSIONS: ( ) = Millimeters

MODEL

WENDY'S

GAS

RANGE

EXTERIOR fl" GAS CONN. ELECTRIC

A

B

Width

36.5" 41.00" 8" 30" 29.375" 4.250" 5" 45.5" 11.875" 28.750" 6" 9.500" 36" 12.5" 4.5" 36" 15.5” 13.5"

(927) (1042) (203) (762) (746) (108) (127) (1156) (302) (730) (152) (241) (914) (315) (115) (914) (394) (345)

C D E F G H I J K L M N 0

Cook

Top

P

Door

Opening

Q

Oven

Bottom

R

MODEL

OVEN INTERIOR

Width Depth Height Hot Top Oven Width Depth Height

BURNERS (BTU each)

CRATE SIZE

Cubic

Volume

Crated
Weight

WENDY'S

GAS RANGE

26.125"

(664)

21.75"

(552)

UTILITY INFORMATION:
GAS-

Total 85,000 BTU. One 3/4" flex hose male connection.
(for location, see drawing above items "L" and "M").

Required operating pressure: Natural Gas 4" W.C.
Propane Gas 10" W.C.

than 3/4" I.D.

14.25"

(362)

3

(20,000)

PAGE 3

1

(25,000)

55"

(1397)

45.5"

(1156)

45"

(1143)

118 cu. ft.

3.33 cu. m.

ELECTRIC ­STANDARD: 115/60/1 - furnished with 5 ft. cord w/ 3-prong

plug. Total maximum amps 6.2.

OPTIONAL: 208/60/1 or for use on 3 (190 to 219 volts) - supply

OPTIONAL: 240/60/1 or for use on 3 (220 to 240 volts) - supply

must be wired to junction box with terminal block located at

must be wired to junction box with terminal block located at
rear. Total maximum amps 4.0.

705 lbs.

317kg.

ADJUSTMENTS

BLOWER

De-energize all power to equipment before attempting to service or replace any
component of the equipment.

When changing motor or servicing unit, always verify that the blower wheel rotation
is as the illustration shows. (clock-wise when looking into oven cavity)

WHEEL

ROTATION

WARNING

CAUTION

FIGURE 1

ONLY on units manufactured before serial numbers 91 H

Blower wheel must not be located over 1/8" from rear of
oven. This is critical for proper burner combustion.

A. MOTOR: The motor is serviceable from the front of the unit through the oven cavity. Remove the rear baffle. Disconnect
the motor mount plate by removing the eight hex nuts that secure it to the oven interior back. Pull the mount plate, with motor
attached, into the oven.

B. CONTROL PANEL ASSEMBLY COMPONENTS: The control panel assembly components are easily serviceable by
removing two screws (one at the top and at the bottom) of the control panel and then sliding out the control panel assembly.

C. THERMOSTAT: After sliding out the control box assembly, the thermostat can be completely removed by removing the
capillary bulb brackets from inside of the oven, and then sliding the capillary bulb out of the oven cavity into the control area.

Before sliding out control box for servicing, remove base panels below oven door and
remove the wire tie from the spark ignitor electrode wire (black wire).

To return control box to original position, push in slowly while lightly pulling the spark ignitor
wire (black wire) into the oven burner control area (below oven door). Re-attach a wire tie

CAUTION

in a similar fashion as before it was removed. Replace base panels.

PAGE 4

ADJUSTMENTS

THERMOSTAT ADJUSTMENT OVEN:

3. Turn on the blower.

competent serviceman.

3. 1/4

turn c

hanges the temperature 35°F.

1.

3.

orifice bracket screws (Item "B").

4.

The calibration of the thermostat should not be changed until sufficient experience with cooking results have definitely proved that the
thermostat is not maintaining proper oven temperatures. Before any recalibration is attempted, the oven temperature should be checked
by the following procedure:

1. The oven must be empty of all trays or pans.

2. Place a pyrometer thermocouple or a reliable mercury oven-type thermometer at the center of the middle rack.

4. Set the dial at 375° F.

5. The red "Cooking Light will go out when the thermostat turns off the burners.

6. Allow three such cycles for the temperature to stabilize.

7. Read the pyrometer or thermostat immediately after the light goes out for the third time and again immediately after it
comes on the next time.

8. If the average of these readings and the dial setting vary by more than 15°, recalibrate by following the instructions
outlined below:

TO RECALIBRATE:
NOTE: Recalibration should be attempted only by a

1. Remove knob from dial shaft (Item "B") from
figure 2.

2. Turn screw (Item "A") in figure 2 clockwise to
decrease and counterdockwise to increase
temperature.

4. Replace knob on dial shaft.

5. After the calibration is made, set the dial at
375°F and recheck the oven temperature using
the method outlined by steps 1 thru 7 of the
oven temperature checking procedure (as
stated above).

OVEN STANDING PILOT ADJUSTMENT:
The standing oven pilot flame can be adjusted by turning
the adjusting screw on the pilot line valve with a
screwdriver. The pilot line valve is located behind the front

FIGURE 2
panel below the oven door.
Remove the front panel to gain accessibility. The pilot flame is property adjusted when it is just large enough to maintain a

glowing red color on the flame switch capillary bulb.
OVEN BURNER FLAME ADJUSTMENT:

The oven burner orifice is of the fixed, type sized for the respective gas supply. The burner flame characteristics are
controlled by varying the primary air mixer cap. There should be a clear blue flame with a distinct inner cone at each port.
Excessive primary air can result in "blowing" or the flames leaving the ports. Lack of primary air causes soft or yellow
tipped flame.

THERMOSTAT REMOVAL AND REPLACEMENT:
(GRIDDLE DOESN'T HAVE TO BE REMOVED)

Refer to figures 3 and 4 for instructions below.

Remove thermostat knob(s).

2. Remove valve panel.
Remove thermostat screw (Item "A") and

Pull thermostat assembly out to side and
remove the burner (Item "C") [this applies for
both sides].

FIGURE 3

PAGE 5

ADJUSTMENTS

THERMOSTAT REMOVAL AND REPLACEMENT: (Continued)

5. Loosen bolt(s) on bottom of griddle plate (Item "D") 1/2 inch then pull thermostat bulb out front.

NOTE: If bulb will not pull out loosen bolt (Item "D") further (DO NOT FORCE).

6. Reverse steps 3 thru 5 to install new thermostat.

NOTE: Snug bolt (Item "D") DO NOT over tighten, (this will damage capillary bulb causing incorrect sensing).

7. Make sure the excess capillary wire is stored in the cool zone under thermostat body in front of burners.

8. Replace valve panel.

9. Replace thermostat knob(s),

FIGURE 4

PRESSURE REGULATOR:
The pressure regulator is factory set a 7-8" W.C. for natural gas and 11-12" W.C. for propane gas. To check the manifold

pressure:

1. Turn all thermostats and burner valves to "OFF" position.

2. Turn main gas valve to entire unit off.

3. Remove valve panels and locate 1/8" plug in manifold.

4. Remove plug and install a fitting appropriate to connect a manometer.

5. Turn on main gas to unit and light pilots.

6. Turn all burners and ovens to full "ON" position and read manometer.

7. If manometer does not read 4" W.C. for natural gas,
or 10" W.C. for propane gas, adjust regulator (if gas pressure
is O.K. go to step 10)

8. Remove cap form top of regulator.

9. With a screwdriver rotate regulator adjustment screw
"Clockwise" to increase, or "counterclockwise" to decrease,
pressure until manometer shows correct reading.

10. Repeat steps 1 and 2.

11. Remove manometer fitting and replace plug in manifold.

12. Repeat step 5.

13. Replace valve panels.

FIGURE 5

PAGE 6

ADJUSTMENTS

FIGURE

7

THERMOSTAT CALIBRATION GRIDDLE:

FIGURE 6

TO RECALIBRATE THERMOSTAT:
This control has been carefully calibrated at the factory. That is, it is adjusted
to match the actual griddle temperatures. Field calibration is seldom necessary
and it should NOT be done unless considerable experience with cooking and
temperatures definitely proves that the control is not maintaining the temperatures
to which the dial is set.

1. When recalibrating, check temperatures as instructed in
previous section (thermostat calibration)

2. Set temperature indicator knob to 300°F marking

3. Remove indicator knob (Item "A") from thermostat
(Item "B"). Refer to figure 7.

4. Using a screwdriver knock out silver insert
(Item "C"). Refer to figure 7.

5. Place knob back on the thermostat shaft.

6. With screwdriver inserted through center
of dial and in the calibration slot of screw push in
and hold - DO NOT rotate screw.

7. Rotate indicator mark until it points to actual temperature you are reading off the temperature sensing
device you placed over the center of the burners.

8. Turn thermostat to 300°P and check temperature again at 5 minute intervals.

9. Remove indicator knob and reinstall center insert.

10. If the griddle will not adjust to within 30°F this means that the sensing bulb is inoperative and the control
should be replaced.

To Check Calibration

1. Turn thermostat to the 300°F of marking see figure 5.

2. After burners have been on a minimum of 1 hour (if cold)

or 30 minutes (if already hot when set at 300°F). Place a
reliable thermometer or therm-couple with test instruments
in the center of the griddle and over the center of each
burner. See figure 6.

3. Continue to check temperatures at 5 minute intervals, until
you have two readings that are within 30° of each other.

4. The control should only be recalibrated if your reading is
not within 30° of the dial setting (300°F).

FIGURE 8

PAGE 7

TROUBLESHOOTING GUIDE

Symptom Check or Replace

1) All burners and pilots in unit will not turn on A) Main gas supply to unit is "OFF".
A) Incorrect gas type supplied to unit. 2) All burners produce excessive carbon deposits
B) Incorrect supply pressure.

A) Incorrect orifices. 3) Only some burners in a unit produce excessive carbon

deposits

B) Primary air not adjusted properly.
A) Pilot gas not adjusted properly. 4) Only some pilots produce excessive carbon deposits

B) Incorrect pilot orifice.
A) Manual valve for top burner in "OFF" position. 5) Top burner (not oven) will not come on

B) Pilot out.

6) Top section pilot will not stay ignited

7) Unit will not heat up

8) Burners produce excessive carbon deposits

A) Pilot gas not adjusted property.
B) Clogged orifice.

C) Draft condition.
D) Improper ventilation system.

E) Air in gas line.
A) Main gas supply is "OFF".

B) Pilot not lit.
C) Safety valve not "ON".

A) Incorrect gas type or orifice size.
B) Incorrect supply pressure.

C) Incorrect burner air mixer adjustment.
D) Burner orifice out of alignment with burner.

E) Incorrect orifices.
A) Pilot gas not adjusted properly. 9) Pilot produces excessive carbon deposits

B) Incorrect pilot orifice.

10) Burner will not come on

11) Pilot will not stay lit

A) Safety valve in "Pilot" position.
B) Pilot out.

C) Clogged burner - charge ports.
A) Pilot was not adjusted properly.

B) Clogged or dirty orifice.
C) Draft condition.

PAGE 8