Hobart HGC20 ML 114573 User Manual

HGC20 & HGC20D  
GAS CONVECTION OVENS  
MODELS  
HGC20  
HGC20D  
ML-114573  
ML-114575  
701 S. RIDGE AVENUE  
TROY, OHIO 45374-0001  
937 332-3000  
FORM 33580 Rev. E (Mar. 2005)  
Installation, Operation, and Care of  
HGC20 AND HGC20D  
GAS CONVECTION OVENS  
SAVE THESE INSTRUCTIONS FOR FUTURE USE  
GENERAL  
The HGC20 Gas Convection Oven is a single cavity oven and features a solid state thermostat,  
1-hour dial timer, and five racks as standard equipment. Additional oven racks are optional. Each oven  
is equipped with a 25,000 BTU/hr burner and a 1/2 HP (0.37 kw) electric motor. The oven comes standard  
with porcelain interior; stainless steel exterior.  
Model HGC20D is similiar to model HGC20, except the HGC20D has either an electronic control or  
programmable control package in place of the solid state controller.  
Two single ovens can be ordered with a stacking kit for mounting one oven on top of the other.  
A single oven may be installed on an open stand with lower storage rack (optional).  
COOK &  
HOLD  
GENTLE  
BAKE  
RACK #  
MODEL  
THERMOSTAT  
Solid State  
Electronic  
TIMER  
COOK TIMES  
HGC20  
1-Hour Dial  
Electronic  
HGC20D before Octover 1999  
HGC20D after October 1999  
X
X
X
Programmable Programmable  
X
INSTALLATION  
UNPACKING  
Immediately after unpacking the oven, check for possible shipping damage. If this oven is found to be  
damaged, save the packaging material and contact the carrier within 15 days of delivery.  
Prior to installation, verify that the electrical supply and type of gas supply (natural or propane) agree  
with the specifications on the oven data plate, located on the inside of the top front cover.  
Do not use the door or its handle to lift the oven.  
LOCATION  
The equipment area must be kept free and clear of combustibles. Maintain clearances from combustible  
or noncombustible construction for at least 3" (7.6 cm) from the side and 3" (7.6 cm) from the back of the  
oven. The installation location must allow adequate clearances for servicing and proper operation.  
The oven must be installed so that the flow of combustion and ventilation air will not be obstructed.  
Adequate clearance for air openings into the combustion chamber must be provided. Make sure there  
is an adequate supply of air in the room to allow for that required for combustion of gas at the oven  
burners.  
– 3 –  
INSTALLATION CODES AND STANDARDS  
Hobart ovens must be installed in accordance with:  
In the United States of America:  
1. State and local codes.  
2. National Fuel Gas Code, ANSI-Z223.1 (latest edition). Copies may be obtained from The American  
Gas Association, Inc., 1515 Wilson Blvd., Arlington, VA 22209.  
3. National Electrical Code, ANSI/NFPA-70 (latest edition). Copies may be obtained from The  
National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.  
In Canada:  
1. Local codes.  
2. CSA B149.1 Natural Gas and Propane Installation Code.  
3. CSA C22.2 Canadian Electrical Code.  
The above are available from the Canadian Standard Association, 5060 Spectrum Way, Suite 100,  
Mississauga, Ontario, Canada L4W 5N6.  
Ovens Mounted on Casters  
Ovens mounted on casters must use a flexible connector (not  
supplied by Hobart) that complies with the Standard for Connectors  
for Movable Gas Appliances, ANSI Z21.69 • CSA 6.16 and a quick-  
disconnect device that complies with the Standard for Quick-  
Disconnect Devices for Use With Gas Fuel, ANSI-Z21.41 • CSA  
6.9. Inaddition, adequatemeansmustbeprovidedtolimitmovement  
of the appliance without depending on the connector and the quick-  
disconnect device or its associated piping to limit appliance  
movement. Attach the restraining device at the rear of the oven as  
shown in Fig. 1.  
CONNECT  
GAS LINE  
STRAIN RELIEF  
HERE  
PL-53563  
Fig. 1  
If disconnection of the restraint is necessary, turn off the gas supply before disconnection. Reconnect  
this restraint prior to turning the gas supply on and returning the oven to its installation position.  
Separate instructions for installing casters to the oven are included with the casters.  
Note: If the oven is installed on casters and is moved for any reason, it is recommended that the oven  
be releveled front to back and side to side for even baking.  
Assembling the Legs to the Single Oven  
The 4" (10 cm) or 6" (15 cm) legs are packed inside the oven during shipment and must be installed on  
the bottom of the oven. Place the oven on its left side, being careful to avoid scratching the finish. The  
gas pipe connection protrudes beyond the back; provide for this when oven is tipped back by resting  
it on suitable spacers (2 x 4's etc.).  
Thread each of the four leg assemblies into the holes provided on the bottom corners of the oven.  
Carefully raise the oven to its normal upright position.  
– 4 –  
Assembling the Chimney to the Single Oven  
CHIMNEY  
Remove the chimney from inside the oven cavity and use the  
screws provided to fasten the chimney to the top rear of the oven  
(Fig. 2). The flanges on the chimney are to be positioned over the  
top cover.  
ASSEMBLING THE OVEN TO THE STAND  
Position the oven on its back, taking care not to scratch or damage  
it. The gas pipe connection protrudes beyond the back; provide for  
this when the oven is tipped back by resting it on suitable spacers  
(2 x 4's). Install the two locating studs (included in the stand carton)  
into the screw plates on the underside of the oven (Fig. 3).  
PL-52240  
Fig. 2  
Attach each of the four leg assemblies to the bottom of the stand  
with the 12 bolts and lockwashers (3 per leg). If casters are used  
instead of legs, put fixed casters in rear and swivel casters in front  
using 12 bolts and lockwashers (3 per caster). Mount the oven on  
top of the stand.  
FRONT OF TOP OVEN  
LOCATING STUDS  
BOTTOM  
ASSEMBLING STACKED OVENS  
Determine which oven will be on the bottom and place it on its left  
side, being careful to avoid scratching the finish. Install the four 163/4  
"
KNOCK OUT WELDED PLATE  
FOR FLUE EXTENSION INSTALLATION  
(42.5 cm) legs, using the 24 bolts and lockwashers provided (6 per  
leg). Remove the two 7/16" (1.1 cm) knockouts on each side of the top  
cover and place oven in upright position at installation location.  
Turn the adjustable feet in or out to level the oven front-to-back and  
side-to-side (refer to LEVELING, page 6).  
REAR OF TOP OVEN  
PL-52992  
Remove right-hand side panels from both ovens. Remove welded  
plate from bottom of upper oven (Fig.3). Install the two locating  
studs (included in leg stack set) into screw plates on underside of  
upper oven (Fig. 3). Place upper oven on top of lower oven using  
the locating studs.  
Fig. 3  
CHIMNEY  
Remove flue extension from upper oven. Install long flue extension  
into existing right-angled flue extension in lower oven. Attach long  
flue extension to wall of upper oven using screws provided. Secure  
chimney to roof of upper oven (Fig. 4).  
LONG FLUE  
EXTENSION  
Install right side panels on both ovens. Connect the piping between  
the top oven and bottom oven. Pipe compound must be resistant  
to the action of propane gases.  
The manual gas valve at the bottom of the control panel should  
remain off until all electrical connections are made and the ovens  
are checked or used.  
RIGHT ANGLED  
FLUE EXTENSION  
PL-52221  
Fig. 4  
– 5 –  
LEVELING  
Once the oven is in its permanent position, place a carpenter's level on the oven rack. If the oven is  
installed on legs, turn the adjustable feet in or out to level oven front-to-back and side-to-side. If the  
oven is installed on casters, loosen set screws and turn casters in or out to level oven front-to-back and  
side-to-side. Retighten set screws after leveling.  
ELECTRICAL CONNECTIONS  
WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE  
APPLICABLE PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL  
ELECTRICAL CODES.  
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW  
LOCKOUT / TAGOUT PROCEDURES.  
WARNING: APPLIANCES EQUIPPED WITH A FLEXIBLE ELECTRIC SUPPLY CORD ARE  
PROVIDED WITH A THREE-PRONG GROUNDING PLUG. IT IS IMPERATIVE THAT THIS PLUG  
BE CONNECTED INTO A PROPERLY GROUNDED THREE-PRONG RECEPTACLE. IF THE  
RECEPTACLE IS NOT THE PROPER GROUNDING TYPE, CONTACT AN ELECTRICIAN. DO  
NOT REMOVE THE GROUNDING PRONG FROM THIS PLUG.  
The 120 volt models are equipped with a cord and plug.  
Refer to electrical wiring diagram located inside the right side panel; remove control panel for access.  
Do not turn the power supply on until after the gas connections have been made and checked for leaks.  
ELECTRICAL DATA  
Minimum Circuit Ampacity  
Maximum Protective Device  
MODEL  
Volts  
120  
Hertz  
60  
Phase  
AMPS  
1
1
1
1
1
15  
HGC20  
200 - 240  
200 - 240  
120  
50  
15  
60  
15  
60  
15  
HGC20D  
200 - 240  
50 / 60  
15  
Complied in accordance with the National Electrical Code, NFPA-70 (latest edition).  
– 6 –  
GAS CONNECTION  
GAS DATA  
INPUT / BTU/HR  
MANIFOLD PRESSURE  
MODEL  
Natural  
Propane  
Natural  
Propane  
HGC20, HGC20D  
25,000  
25,000  
3.5" w.c. (0.8 kPa)  
10" w.c. (2.5 kPa)  
For all gas supply connections, pipe joint compound must be resistant to the action of propane gases.  
The oven is provided with a regulator integral to the gas solenoid valve, and requires no regulator  
external to the device. A gas shutoff valve is supplied with each oven and is located at the bottom of  
the control panel. No tools are required to access this valve.  
Connect the oven(s) to the gas line after leveling. The gas supply line must be at least the equivalent  
3
of /4" (1.9 cm) iron pipe. Make sure the pipes are clean and free of obstructions, dirt and piping  
compound.  
WARNING: PRIOR TO LIGHTING, CHECK ALL JOINTS IN THE GAS SUPPLY LINE FOR LEAKS.  
USE SOAP AND WATER SOLUTION. DO NOT USE AN OPEN FLAME.  
TESTING THE GAS SUPPLY SYSTEM  
The oven and its individual shutoff valve must be disconnected from the gas supply piping system  
during any pressure testing of that system at test pressures greater than 1/2 psig (3.45 kPa).  
The oven must be isolated from the gas supply piping system by closing the manual shutoff valve during  
pressure testing of the gas supply system at test pressures equal to or less than 1/2 psig (3.45 kPa).  
GAS PRESSURES AND ORIFICES  
Natural Gas  
The burner orifices are sized to deliver the nameplate input rating (25,000 BTU/hr) at a gas manifold  
pressure of 3.5" w.c. (water column)(0.8 kPa). The gas pressure regulator is integral to the gas solenoid  
valve, and is factory set to supply 3.5" w.c. (0.8 kPa) as required for natural gas.  
Propane Gas  
The burner orifices are sized to deliver the nameplate input rating (25,000 BTU/hr) at a gas manifold  
pressure of 10.0" w.c. (water column)(2.5 kPa). The gas pressure regulator is integral to the gas solenoid  
valve, and is factory set to supply 10.0" w.c. (2.5 kPa) as required for propane gas.  
BURNER AIR SHUTTER ADJUSTMENTS  
The burner has fixed, factory adjusted air openings and requires no field adjustment.  
– 7 –  
FLUE CONNECTION  
Ventilation requirements will vary with each installation and must comply with Vapor Removal from  
Cooking Equipment, NFPA Standard #96 (latest edition) and with local codes. Considerations to be  
kept in mind include:  
• Flue connections should never be made directly to the oven.  
• The oven should be located under a hood which has an adequate connection to an exhaust duct  
and extends 6" (15 cm) beyond the oven sides.  
• Clearance above the oven flue should be adequate for the flue products to escape so that there  
is no interference with the heat circulation in the ovens.  
OPERATION  
WARNING: THE OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, CLEANING,  
OR PERFORMING ANY MAINTENANCE.  
CONTROLS — MODEL HGC20 (Fig. 5)  
ON / OFF / COOL DOWN Switch • Turns oven control  
circuits ON or OFF; or COOL DOWN allows the fan  
motor to run with the doors ajar to speed oven  
ON/OFF/COOL  
DOWN SWITCH  
P
O
W
E
R
O
cooling.  
N
O
N
F
F
C
O
O
L
D
O
W
THERMOSTATControlsoventemperatureduringcooking  
operation.  
ON LIGHT  
O
N
H
E
A
T
IGNITION  
HEAT LIGHT  
COOK TEM  
TIMER • Use to set cooking cycle time. The timer range is  
from 0 to 60 minutes. Alarm sounds continuously  
when elapsed time counts down to 0; oven does not  
turn off. Turn timer to OFF position to stop alarm.  
When oven is not in use, keep timer at OFF position.  
PERATURE  
500  
475  
NO IGNITION LIGHT  
150  
225  
250  
300  
450  
42
40
350  
300  
THERMOSTAT  
TIMER  
COOK TIME  
ON LIGHT (Amber) • Is lit when the ON / OFF / COOL  
DOWN switch is positioned at ON or COOL DOWN.  
0
60  
5
55  
50  
45  
10  
15  
20  
40  
35  
30  
25  
HEAT LIGHT (White) • Comes on and goes off when the  
burner cycles on and off.  
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L
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.
NO IGNITION LIGHT (Red) • Comes on if burner fails to  
ignite after the third try. When lighting the oven, the  
NO IGNITION LIGHT cycles ON during the 5 second  
purge and OFF during the 7 second ignition trial.  
O
N
O
F
F
GAS VALVE  
G
A
S
V
A
L
V
E
T
E
O
P
S
L
IG  
L
A
C
IT  
A
H
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V
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;L  
N
E
/O  
N
W
F
F
/C  
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G
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IN  
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J;L  
"O  
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;L  
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JK  
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PL-52227  
GAS VALVE • When ON, allows gas to flow to the ignition  
system.  
Fig. 5  
– 8 –  
LIGHTING THE HGC20 OVEN  
Open the manual valve. Turn the ON / OFF / COOL DOWN switch ON and turn the thermostat to its  
maximum setting. Both the ON and HEAT lights should be lit. If the HEAT light is not on, make sure  
the door is closed.  
After 5 seconds, the spark ignition system will initiate and the solenoid valve will open, allowing gas  
flow to the burner for a period of 7 seconds. This 5 second purge and 7 second ignition trial will repeat  
itself up to two more times if the burner does not light within the first 7 second ignition trial. During the  
5 second prepurge, the red NO IGNITION light will be lit.  
When the burner gas ignites, a slight "roar" will be audible. This "roar" is a normal condition of the power  
burner, and will become almost undetectable in the normal operating mode after warm-up. The NO  
IGNITION light will go off when ignition occurs.  
If the burner fails to light after three trials, the red NO IGNITION light will be illuminated and remain on.  
Turn the ON / OFF /COOL DOWN switch to OFF for five minutes before repeating the operating  
sequence listed above.  
If burners do not light after five trials, turn off the manual valve and call your local Hobart service office.  
BEFORE FIRST USE  
Before the oven is used for the first time, it must be "burned in" to release any odors that might result  
from heating the new surfaces in the chamber.  
Using a clean damp cloth, wipe the inside of the oven, including the racks.  
Close the oven door, turn the ON / OFF / COOL DOWN switch ON, turn the thermostat to 300°F (149°C)  
and allow the oven to cycle for 6 to 8 hours before turning the switch OFF.  
USING THE HGC20 OVEN  
Preheating  
1. Turn ON / OFF / COOL DOWN switch ON. The amber ON light will come on, indicating that power  
to the oven is on.  
2. Set the THERMOSTAT as desired. Refer to SUGGESTED COOKING GUIDELINES for  
temperatures and times for various products.  
3. Prepare product and place in suitable pans. When the white HEAT light goes off, the oven has  
reached desired preheat temperature.  
Cooking  
1. Open the door and load the product into the oven. Place pans in the center of racks. Close the  
door.  
2. Set the TIMER. After the preset time lapses, turn timer OFF to stop the buzzer.  
3. When product is done, open the door and carefully remove the cooked product from the oven.  
Wipe up any spills.  
End of Day  
1. Turn the THERMOSTAT OFF.  
2. Turn ON / OFF / COOL DOWN switch to COOL DOWN.  
3. Leave door ajar while the fan is on to cool the oven.  
4. When oven has cooled sufficiently, turn the ON / OFF / COOL DOWN switch OFF and clean the  
oven.  
– 9 –  
CONTROLS — MODEL HGC20D Built before October 1999 (Fig. 6)  
HEAT LIGHT  
THERMOSTAT  
TEM  
P
E
R
A
T
U
R
E
TEMPERATURE KNOB  
COOK BUTTON  
HEAT  
READY LIGHT  
HOLD BUTTON  
RE  
AD  
Y
CO  
O
K
HO  
L
D
THERMOMETER BUTTON  
TIMER  
TI  
M
E
TIMER KNOB  
COOK BUTTON  
CO  
O
K
ST  
ST  
A
O
R
P
T
PU  
L
S
E
START/STOP BUTTON  
PULSE BUTTON  
ON / OFF / COOL DOWN  
SWITCH  
PO  
ON  
W
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"ON" POSTION. IF  
FAILS TO LIGHT. PUSH  
O
T
VEN  
IO  
N
S
O
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F
F
GAS VALVE  
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PL-52226  
Fig. 6  
THERMOSTAT CONTROL  
Temperature Display (When not timing product).  
Displays set cook temperature while the light in the Cook Button is lit. It will be overridden to display  
the actual cavity temperature for 8 seconds when the Thermometer Button is pushed.  
1. The light in the Thermometer Button will be lit while the actual temperature is being displayed.  
2. The light in the Thermometer Button will extinguish when the display returns to set temperature  
display.  
Temperature Display (When product is being timed).  
Displays set hold temperature while the light in the Hold button is lit. Displays the cook temperature  
when the Cook button is lit. Will be overridden to display actual cavity temperature for 8 seconds when  
the Thermometer Button is pushed.  
1. The light in the Thermometer Button will be lit while actual temperature is being displayed.  
2. The light in the Thermometer Button will extinguish when the display returns to set temperature  
display.  
Temperature Knob (When not timing product).  
1. Sets the cook temperature when the Cook Button light is lit. The Cook Button light can be turned  
on by pressing the Cook Button.  
2. Sets the hold temperature when the Hold Button light is lit. The Hold Button light can be turned  
on by pressing the Hold Button.  
Temperature Knob (When product is being timed).  
1. Sets the cook temperature when the Cook Button light is lit. The Cook Button light cannot be  
changed by pressing the Cook Button.  
2. Sets the hold temperature when the Hold Button light is lit. The Hold Button light cannot be  
changed by pressing the Hold Button.  
– 10 –  
Cook Button Light (If On and not timing product).  
Indicates the cook mode is selected. This means:  
• The displayed temperature settings will be for the cook temperature except for the time that the light  
in the Thermometer Button is lit.  
• Rotating the Thermostat Knob will change the cook set temperature.  
• Cook time can be adjusted using the Timer Knob.  
• The time displayed is the initial set cook time.  
• It is possible to select the Hold mode using the Hold Button.  
Cook Button Light (If On and product is being timed).  
Indicates the cook mode is selected. This means:  
• The displayed temperature settings will be for the cook temperature except for the time that the light  
in the Thermometer Button is lit.  
• Rotating the Temperature Knob will change the cook set temperature.  
• It is not possible to select the Hold mode using the Hold Button.  
• The time displayed is the time counted down from the initial cook time set.  
Cook Button  
1. Lights the Cook Button light. See Cook Button Light above.  
2. Selects the Cook mode.  
3. Has no effect if timing in the Hold mode.  
Thermometer Button — When pressed, causes actual cavity temperature to display for about 8  
seconds, then display returns to set temperature.  
Heat Light — When lit, indicates that power is being supplied to the burner.  
Ready Light — Will be lit any time the actual temperature is within 5 F° (3 C°) of the set temperature  
for the current mode.  
TIMER CONTROL  
Time Display (While not timing product).  
— Displays the set cook time if the light in the Cook Button is lit.  
Time Display (While product is being timed).  
1. Displays the counted down cook time if the Cook Button light is lit and in the Cook mode.  
2. Displays the counted up hold time if the Hold Button light is lit and in the Hold mode. Count-up  
of hold time does not begin until cavity temperature reaches the hold temperature.  
Time Display Colon  
1. Is flashing if product is timing.  
2. Is not flashing product is not being timed.  
Time Button — Press to set cooking cycle time.  
Time Button Light — Is lit when the Time Button is pressed.  
Timer Knob — Sets the cook time when not already timing and the Cook Time indicator is lit.  
– 11 –  
Pulse Button  
Selects the pulse time setting. A cook time must be set first. The pulse time can then be set equal to  
or less than the cook time. The pulse time will be the portion of cook time to operate in the pulse mode.  
Pulse mode will start first. When pulse time elapses, the remainder of the cook time will be in the non-  
pulse mode.  
Use when cooking delicate product, such as strudel, muffins, cupcakes, meringue pies, etc., to keep  
product from forming waves on the top.  
Use the Pulse Button to switch between the selection of pulse mode and non-pulse mode. A pulse time  
of zero selects non-pulse mode.  
The light in the Pulse Button will be lit when in the pulse mode.  
Pulse Mode — The fan cycles ON 45 seconds and OFF 45 seconds for the duration of the Pulse cycle.  
The fan stays on while the heat cycles in hold mode.  
The fan stays on while heat cycles at 100% power when not timing.  
Pulse Mode can be switched on or off at any time.  
Stop / Start Button  
1. Starts timing a product in the mode selected if a cook time has been set.  
2. Stops timing of a product if a timing sequence has already started.  
Hold Button — Selects Hold mode.  
1. Allows selection of hold temperature.  
2. Temperature indication of ---°F (---°C) indicates no hold mode.  
Hold Button Light — Is lit when in the Hold mode.  
1. When not timing, allows setting / enabling a hold mode setting of ---°F (---°C), meaning no hold  
will take effect.  
2. Any other temperature means that when the actual cook time has ended, the oven will enter the  
Hold mode and use the hold temperature.  
On / Off / Cool Down Switch  
1. ON turns oven control circuits on.  
2. OFF turns oven control circuits off.  
3. COOL DOWN allows the fan motor to run with the doors ajar to speed oven cooling.  
Gas Valve — When ON, allows gas to flow to the ignition system.  
LIGHTING THE HGC20D OVEN  
1. Turn manual gas valve ON.  
2. Push the ON / OFF / COOL DOWN switch ON and set the THERMOSTAT to its maximum setting.  
The HEAT light should come on. If HEAT light is not on, make sure the door is closed.  
3. If the oven fails to light, push the ON / OFF / COOL DOWN switch OFF. Wait 5 minutes before  
trying to relight the oven.  
– 12 –  
BEFORE FIRST USE  
Before using the oven for the first time, it must be "burned in" to release any odors that might result from  
heating the new surfaces in the chamber.  
1. Using a clean damp cloth, wipe the inside of the oven, including the racks.  
2. Close the oven door, push the ON / OFF / COOL DOWN switch ON, turn the thermostat to 300°F  
(149°C) and allow the oven to cycle for 6 to 8 hours before turning the ON / OFF / COOL DOWN  
switch OFF.  
USING THE HGC20D OVEN  
Preheating  
1. Push ON / OFF / COOL DOWN switch ON. The HEAT light will come on, indicating that power  
to the oven is on.  
2. Set the THERMOSTAT as desired. Refer to SUGGESTED COOKING GUIDELINES for  
temperatures and times.  
3. Prepare product and place in suitable pans. When READY light comes on, oven has reached  
desired preheat temperature.  
Cooking  
1. Open the door and load the product into the oven. Place pans in the center of the racks. Close  
the door.  
2. Set COOK temperature and time. Set HOLD temperature and PULSE time, if desired. PULSE  
time may not be more than COOK time. PULSE will cycle the fan during the set time at the  
beginning of the cook cycle.  
3. Press the START / STOP button to start the cooking cycle.  
4. At the end of the cooking cycle, the buzzer will sound continuously if the HOLD mode is OFF. If  
the HOLD mode is ON, there will be a short beep at the beginning of Second Stage Cooking (oven  
temperature will begin to decline to the HOLD temperature), and a long beep (20 seconds) at the  
end of the cooking cycle. Refer to COOK AND HOLD OPERATION.  
5. When product is done, open the door and carefully remove cooked product from the oven. Wipe  
up any spills.  
End of Day  
1. Push ON / OFF / COOL DOWN switch to COOL DOWN. Leave door ajar while the fan is on to  
cool the oven.  
2. When the oven has cooled sufficiently, push the ON / OFF / COOL DOWN switch OFF and clean  
the oven.  
ERROR MESSAGES — HGC20D OVEN  
E-01  
E-02  
E-03  
E-04  
E-05  
E-06  
High limit error. Contact your local Hobart service office.  
Low limit error. Contact your local Hobart service office.  
High ambient temperature, 215°F (102°C). Contact your local Hobart service office.  
Low ambient temperature, 32°F (0°C). Let control warm up after cold storage.  
Ignition failure. After trying ignition three times, contact your local Hobart service office.  
Thermocouple probe open. Contact your local Hobart service office.  
When calling for service, please advise what error code was displayed.  
– 13 –  
CONTROLS — MODEL HGC20D Built after October 1999  
Always displays [HR:Min] when setting the Time.  
Displays [HR:Min] if the countdown Time is more than 1 Hour.  
Displays [Min: Sec] if the countdown Time is less than 1 Hour.  
Displays Temperature in °F.  
C & H  
MODE  
OVEN  
READY  
OVEN  
HEATING  
MENU SELECT  
C & H  
MODE  
Indicates the oven is in the Cook and Hold Mode.  
Indicates the oven is preheated and ready for cooking.  
Indicates the oven is preheating.  
PRIMARY  
SECONDARY  
OVEN  
READY  
1
SET  
2
3
4
OVEN  
HEATING  
1
3
5
2
4
6
Primary indicates Menu Items 1, 3, or 5.  
Secondary indicates Menu Items 2, 4, or 6.  
PRIMARY  
COOK  
&
HOLD  
SECONDARY  
START  
STOP  
Up arrow to increase; Down arrow to decrease —  
any programming function.  
5
MENU  
RACK  
POWER  
TEMPERATURE: Use with SET to set the oven Temperature.  
SET: Use with Time or Temperature.  
NO IGNITION  
ON  
OFF  
SET  
COOL  
DOWN  
TIME: Use with SET to manually set the cooking Time.  
Selects Cook and Hold mode.  
COOK  
&
HOLD  
ON  
OFF  
START  
STOP  
Press once to start; press a second time to stop.  
Select Menu Cook Times. Press once for Primary (1, 3, or 5).  
Press a second time for Secondary (2,4,6). See next page.  
1/2  
3/4  
5/6  
PL-53545  
Rack Buttons select individual Menu / Rack # Cook Times —  
once programmed.  
3
1
2
4
5
– 14 –  
MANUALLY SETTING THE TEMPERATURE AND COOK TIME  
To Set the Temperature  
• Press the SET button. Press the TEMPERATURE button; StPt displays to indicate Setpoint.  
• Use the Up and Down Arrow keys to increase or decrease the displayed Temperature value.  
• Press the SET button again to save the Temperature setpoint in the computer.  
To Set the Cook Time  
• Press the SET button. Press the TIME button. Tine displays to indicate TIME.  
• Use the Up and Down Arrow keys to increase or decrease the displayed Cook Time (HR:min).  
• Press the SET button again to save the Time setting in the computer.  
To Start Cooking  
• Press the START / STOP button.  
• The manual Cook Time counts down to 00:00. Displays [HR:Min] above 1 hour; [min: sec] below.  
• The buzzer will sound. To silence the buzzer, press the START / STOP button again.  
* The control retains the manual settings for Temperature and Time.  
TO PROGRAM MENU ITEM and RACK # Cook Times  
Factory Preset and Programmable Cook Times are shown in the table, below:  
PROGRAMMABLE VALUES  
RACK 2 RACK 3  
COOK TIME COOK TIME COOK TIME COOK TIME COOK TIME COOK TIME  
FACTORY PRESET  
MENU ITEM  
MENU  
ITEM  
MENU SELECTION  
MENU ITEM  
RACK 1  
RACK 4  
RACK 5  
COOK TIME  
1 / 2 Primary  
1 / 2 Secondary  
3 / 4 Primary  
3 / 4 Secondary  
5 / 6 Primary  
5 / 6 Secondary  
1
2
3
4
5
6
10 min.  
15 min.  
20 min.  
25 min.  
30 min.  
35 min.  
The Primary indicator light with Menu 1 / 2 selects Menu Item 1 (Factory Preset Cook Time = 10  
minutes). The Secondary indicator light with Menu 1 / 2 selects Menu Item 2 (Factory Preset Cook Time  
= 15 minutes). Similarly, for Menu Buttons 3 / 4 or 5 / 6. Any Menu Item Cook Time can be changed  
using the procedure below. Rack # Cook Times may be programmed if desired but are not required.  
To Change the Time Setting for any Menu Item (1 – 6)  
• To enter program mode, press and hold the Up and Down arrow buttons until PrOG displays.  
Select the Menu Item to be programmed (1 – 6). Tine displays to indicate TIME. Use the Up and  
Down arrow buttons to increase or decrease the Menu Item's COOK TIME. Repeat this step for  
any other Menu Items.  
• Press the START / STOP button; LOC displays. Press the START / STOP button a second time  
to save the Menu Item(s)' COOK TIME(s).  
• Press the START / STOP button once to begin cooking (with the Menu Item's Cook Time). To  
exit, press the START / STOP button a second time.  
To Program Individual Rack # Cook Times for a Menu Item  
• To enter program mode, press and hold the Up and Down arrow buttons until PrOG displays.  
• Select the Menu Item to be programmed (1 – 6); Tine displays to indicate TIME.  
Then select the Rack # (1 – 5). [t 1] indicates Rack #1; [t 2] indicates Rack #2; ... [t 5] indicates  
Rack #5. Use the Up and Down arrows to increase or decrease the COOK TIME for any Rack #.  
• Press the START / STOP button; LOC displays. Press the START / STOP button a second time  
to save the Menu / Rack #'s COOK TIME(s).  
• To exit program mode, press START / STOP twice.  
– 15 –  
Always Set the Temperature Before Setting the Time  
• Press the SET button. Press the TEMPERATURE button; StPt displays. Use the Up and Down  
Arrow keys to increase or decrease the Temperature. To save, press the SET button again.  
At startup, the display will initially show a GROWING BAR. When the oven temperature reaches the Set  
Point, the set temperature displays. The READY light is lit, the HEAT light goes out, and the oven is  
ready for you to select the Cook Time, Menu Item Cook Time, or Menu / Rack # Cook Time.  
Starting a Timed Cycle On All Racks  
• Open the door, door will display.  
• Place the desired product on any of the five racks.  
• Close the door. The display should return to the set temperature or the GROWING BAR.  
• Press the Menu Key once for Primary or twice for Secondary to select a Menu Item Cook Time.  
• Press the START / STOP button *.  
• The timer will count down the time remaining for the Menu Item Cook Time.  
• When the time has counted down to 00:00, the buzzer will sound and all Rack Buttons will flash.  
• To silence the buzzer, press the START / STOP button.  
* Pressing the START / STOP button after making a menu selection will time all racks for the  
selected menu time.  
Starting a Timed Cycle Using Programmed Individual Menu / Rack # Cook Time(s)  
• After the set Temperature is reached, open the door; door displays. Place product(s) in oven.  
• Close the door. The display returns to the set Temperature or the GROWING BAR.  
• Select the Menu Item (once for Primary or twice for Secondary) and the Rack # to select the  
Menu / Rack # Cook Time. If using simultaneous cook times, select the other Menu / Rack #'s.  
• The timer selects the Rack # with the shortest Cook Time and counts down to 00:00.  
• The buzzer sounds and the Rack # flashes. To silence the buzzer, press the flashing Rack #.  
• Open the door; door displays; remove the finished product; close the door.  
The next shortest Cook Time displays, its Rack # flashes and the time counts down to 00:00.  
• The buzzer sounds. Press the flashing Rack #. Open the door, door displays. Remove the  
product, close the door. Repeat from until all Rack #'s are done.  
To Display the Actual Oven Temperature  
• Press and hold the Temperature button for 3 seconds to display Actual Oven Temp until released.  
To End a Cooking Cycle  
At the end of a cooking cycle, the alarm will sound. To silence the alarm and end a Menu Item cooking  
cycle, press START / STOP. To silence the alarm and end a Rack # cooking cycle, press the Rack #.  
To cancel a cooking cycle which might have been started in error, press and hold the Rack button to  
be terminated and press START / STOP at the same time.  
Door and Timing  
Opening the door while loading additional product will interrupt all timing functions until the door is  
closed and the timer resumes. For example, if a product time had diminished to 1 minute and the door  
was opened for 30 seconds and then closed, the timer would still show 1 minute.  
SETTING THE OVEN FOR COOK & HOLD  
• Press the Cook & Hold button to select Cook & Hold.  
• Set the first stage Temperature and the Cook Time as described in: MANUALLY SETTING THE  
TEMPERATURE AND COOK TIME. Press START / STOP to begin cooking.  
* The HOLD Temperature is preset by the computer control at 150°F (66°C).  
– 16 –  
COOK AND HOLD OPERATION — HGC20D OVEN  
Cook and Hold cooks the product in two stages. During First Stage Cooking, the oven temperature is  
regulated by the Cook thermostat for the amount of time set on the Cook Timer. After the lapsed time  
counts down to 00:00, Second Stage Cooking begins. During Second Stage Cooking, the burners are  
off as the temperature in the oven declines to the Hold Temperature. The doors should remain closed  
during Second Stage Cooking.  
When the Hold temperature is reached, cooking is done. The Time Display counts up the Hold time and  
flashes "Hold." Temperature in the oven will be maintained at the Hold temperature until the oven is  
turned off.  
COOK AND HOLD DIAGRAM - Time vs. Temperature  
OVEN TEMPERATURE  
SHORT BEEP.  
400ºF  
300ºF  
200ºF  
100ºF  
TIMER DISPLAY COUNTS DOWN,  
COLON FLASHES.  
TIMER DISPLAY FLASHES 00:00.  
COOK THERMOSTAT OFF.  
BURNERS OFF UNTIL HOLD  
TEMPERATURE IS REACHED.  
COOKING FROM  
STORED HEAT  
LONG BEEP (20 SEC.)  
BURNERS MAINTAIN  
HOLD TEMPERATURE.  
TIMER DISPLAY COUNTS UP  
HOLD TIME AND FLASHES  
"HOLD."  
LOAD PRODUCT  
INTO OVEN  
PRODUCT TEMPERATURE  
TEMP.  
TIME  
PREHEAT  
FIRST STAGE COOKING  
SECOND STAGE  
COOKING  
HOLDING  
(DO NOT OPEN  
DOORS)  
PL-51608  
PROPER UTENSILS  
Theuseofproperutensilscanenhanceovenoperation. Mediumandlightweightpansarerecommended  
since it is more economical to bake with lighter pans.  
Meats should be roasted in shallow pans deep enough to hold all juices and allow free air circulation.  
CONSERVING ENERGY  
• Turn off unused equipment.  
• Adjust menu patterns and cooking/baking schedules for optimum equipment use.  
• Reduce thermostat settings in slack periods since gas equipment heats up and recovers quickly.  
• Preheat only to required cooking temperature for specific food - not higher.  
• Do not open the oven door unless absolutely necessary. Use the window to observe cooking  
progress.  
• Keep area around the oven door clean and free of food particles.  
• Any obstruction that prevents the door from closing completely will adversely affect oven  
efficiency.  
OPERATING HINTS  
When using the convection oven for the first time with a particular food, check the degree of doneness  
periodically before the suggested time has elapsed, to make sure the desired doneness is achieved.  
Record your temperature and time settings for various products. The convection oven can provide  
consistent, repeatable results.  
– 17 –  
The convection oven is a bit faster than conventional deck-type ovens; temperature settings are lower  
and cook times are shorter. Since recipes and foods are subject to many variations and tastes, the  
guidelines regarding times and temperatures in this manual are SUGGESTIONS ONLY. Experiment  
with your food products to determine the cooking temperatures and times that give you the best results.  
CLEANING  
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW  
LOCKOUT / TAGOUT PROCEDURES.  
Clean outside of the oven daily by wiping with a clean damp cloth.  
Clean porcelain oven interior daily with soap or detergent and water. Rinse thoroughly and wipe dry with  
a soft clean cloth.  
Stainless Steel Exterior  
Soap or detergent and water usually handle routing cleaning. Rinse thoroughly and dry with a soft clean  
cloth.  
For burned-on foods and grease which resist simple soap and water cleaning, an abrasive cleanser  
(scouring powder) mixed into a paste may be used. Apply with stainless steel wool or sponge, always  
rubbing with the "grain."  
This treatment is equally effective for "heat tint" (slightly darkened areas caused by oxidation). Again,  
remember to rub in the direction of the polish lines. Rinse with clear water and dry with a soft cloth.  
SUGGESTED COOKING GUIDELINES — MODELS HGC20 AND HGC20D  
BAKED PRODUCTS  
Product  
Temp.  
Time (min.)  
No. Shelves  
°F  
300  
325  
325  
300  
300  
325  
325  
325  
300  
275  
350  
350  
300  
350  
275  
325  
325  
(°C)  
Sheet Cakes (5 lb. each) (2.3 kg)  
Soda Biscuits  
Yeast Rolls  
Corn Bread  
Gingerbread  
Chocolate Cake  
Chocolate Chip Cookies  
Sugar Cookies  
Yellow Cake  
Angel Food Cake  
Brownies  
Apple Turnovers  
Cream Puffs  
Apple Pie (Fresh)  
Pumpkin Pie  
Berry Pies (Frozen)  
Fruit Pie (Frozen)  
Pizza (Individual, Frozen)  
(Precooked Crust)  
Bread (1 lb. loaf) (454 gr.)  
Brown and Serve Rolls  
Coffee Cake  
Pineapple Upside Down Cake  
Fruit Cobbler  
Danish Pastry  
Pie Shells  
Cinnamon Buns  
(149)  
(163)  
(163)  
(149)  
(149)  
(163)  
(163)  
(163)  
(149)  
(135)  
(177)  
(177)  
(149)  
(177)  
(135)  
(163)  
(163)  
30  
12  
15 - 20  
15  
18  
20  
10  
12  
25  
25  
15 - 20  
20 - 25  
25 - 30  
30  
40  
40  
5
5
5
5
3
5
5
5
5
5
5
5
5
5
5
5
5
45  
310 - 325  
(154 - 163)  
8 - 13  
5
340  
350  
300  
325  
375  
325  
350  
325  
(171)  
(177)  
(149)  
(163)  
(190)  
(163)  
(177)  
(163)  
30  
15  
45  
30  
25  
12 - 15  
12  
15-20  
3
5
3
5
5
5
5
5
– 18 –  
MEAT & FISH PRODUCTS  
Temp.  
Product  
Time (min.)  
No. Shelves  
°F  
250  
(°C)  
(121)  
Prime Rib (20 lb. rare) (9.1 kg)  
Rolled Roast Beef  
23¦4 Hr.  
21¦2 Hr.  
21¦2 Hr.  
25 – 30  
12  
2
2
2
3
5
1
3
5
5
5
5
275  
(135)  
Veal Roast Boned (15 lb.) (6.8 kg)  
Stuffed Pork Chops  
Lamb Chops  
275  
(135)  
300  
(149)  
375  
(190)  
Steamship Round (80 lb.) (36.3 kg)  
Meatloaf  
275  
(135)  
23¦4 Hr.  
325  
(163)  
40  
Hamburger Patties (4 oz.) (113 gr.)  
Meat Pot Pies  
400  
(204)  
8-10  
350  
(177)  
40  
Chicken Parts  
300 – 325  
350  
(149 – 163)  
(177)  
30 – 40  
18  
Fish Sticks  
MISCELLANEOUS PRODUCTS  
Temp.  
Product  
Time (min.)  
No. Shelves  
°F  
(°C)  
Macaroni & Cheese  
350  
375  
400  
400  
350  
325  
250  
(177)  
(190)  
(204)  
(204)  
(177)  
(163)  
(121)  
30  
10  
45  
55  
20  
35  
90  
3
5
5
5
5
5
3
Cheese Sandwiches  
Baked Potatoes (6 - 8 oz.) (170 - 227 gr.)  
Baked Potatoes (10 oz.) (283 gr.)  
Stuffed Peppers  
Scalloped Potatoes  
Lasagna  
FOR BEST RESULTS  
Product to be cooked should be centered on the oven rack, and the racks should be spaced evenly  
inside the oven.  
It is best not to rotate the product or open the door during the cooking cycle.  
Preheat the oven to 50 F° (28 C°) higher than desired cooking temperature. After the oven is loaded,  
close the door and set thermostat to desired cooking temperature.  
Make adjustments in the time and temperature settings until the desired results are obtained. Adjust  
only one setting at a time. For example, if the product is too dark on the outside and not done on the  
inside, the oven is too hot. Reduce the temperature by 25 F° (14 C°).  
These cooking charts will be helpful in arriving at time and temperature settings for products commonly  
cooked in convection ovens, but it may be necessary to make adjustments in the settings until the  
desired results are obtained.  
When the desired results are obtained, make a note of the settings used for a particular recipe and  
product load. For example, if four 18 x 26" (45.7 x 66 cm) sheet cakes using 5 lb. (2.26 kg) of batter for  
each cake, constitutes a typical product load and the size of the load is changed, the final results may  
be affected. If either the weight of the cakes being baked or the number of cakes being baked at one  
time changes, it may be necessary to make further adjustments in the time or temperature settings to  
achieve the desired results.  
– 19 –  
MAINTENANCE  
WARNING: THE OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, CLEANING,  
OR PERFORMING ANY MAINTENANCE.  
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW  
LOCKOUT / TAGOUT PROCEDURES.  
LUBRICATION  
The fan motor comes with sealed bearings and requires no lubrication.  
The door hinges and mechanism require occasional lubrication with mineral oil.  
DISCONNECTING GAS LINE RESTRAINT  
If this oven is placed on casters, it should be connected to the supply piping with the proper disconnect  
device and restraint. If it is necessary to disconnect the restraint, first turn off the gas supply. Reconnect  
the restraint before turning the gas supply on and returning the oven to its original installation position.  
VENT  
Annually check the flue, when cool, to be sure it is free of obstructions.  
TROUBLESHOOTING  
If the NO IGNITION LIGHT remains lit for more than 20 seconds after three trials (Model HGC20), or  
if E-05 displays after three trials (Model HGC20D):  
• Allow oven to cool.  
• Turn oven off for 5 minutes before attempting to re-light.  
• Check gas supply valves to be sure they are open.  
• Check electrical power source and connections.  
• Call your local Hobart service office.  
SERVICE  
Contact your local Hobart-authorized service office for any repairs or adjustments needed on this  
equipment. Long-term service contracts are available on this and other Hobart products.  
When calling for service, the following information must be available: model number, serial number,  
manufacture date (MD) and voltage.  
– 20 –  
FORM 33580 Rev. E (Mar. 2005)  
PRINTED IN THE U.S.A.  

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