Hobart Corp Convection Oven HBA2G User Manual

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HBA RACK OVEN  
WITH ADVANCED ELECTRONIC  
OVEN CONTROL  
MODELS  
HBA1G  
HBA2G  
GAS  
GAS  
HBA1E  
HBA2E  
ELECTRIC  
ELECTRIC  
FOR OVENS MANUFACTURED AFTER MARCH 2005  
701 S. RIDGE AVENUE  
TROY, OHIO 45374-0001  
937 332-3000  
FORM 36801 (May 2005)  
MODEL HBA RACK OVEN  
– 3 –  
TABLE OF CONTENTS  
GENERAL ............................................................................................................................................ 5  
INSTALLATION.................................................................................................................................... 5  
OPERATION ........................................................................................................................................ 6  
HBA Advanced Controls ................................................................................................................ 6  
Auto On/Off Timer and Clock ................................................................................................. 8  
Basic Operation ....................................................................................................................... 9  
Cooling Oven ......................................................................................................................... 10  
Operational Hints................................................................................................................... 10  
Back-Up Control Operation (optional) ........................................................................................ 11  
Safety Alarm................................................................................................................................. 11  
Food Service Steam Mode .......................................................................................................... 12  
Kosher Operation Mode (ovens equipped with Kosher Package) ............................................ 12  
Programming the Oven ............................................................................................................... 13  
Customized Operation ................................................................................................................. 17  
Shutdown...................................................................................................................................... 19  
Restarting Oven ........................................................................................................................... 19  
Cleaning........................................................................................................................................ 20  
MAINTENANCE ................................................................................................................................. 21  
General ......................................................................................................................................... 21  
Preventive Maintenance .............................................................................................................. 21  
Service and Parts Information..................................................................................................... 21  
TROUBLESHOOTING ....................................................................................................................... 22  
Burners Will Not Light on Gas Oven........................................................................................... 22  
Alarms and Display Messages .................................................................................................... 22  
Other Troubleshooting Topics..................................................................................................... 22  
OWNER PREVENTIVE MAINTENANCE PROCEDURE................................................................. 23  
Introduction................................................................................................................................... 23  
Preventive Maintenance Procedure............................................................................................ 23  
– 4 –  
OPERATION AND CARE OF  
MODEL HBA RACK OVEN  
SAVE THESE INSTRUCTIONS  
GENERAL  
The Hobart HBA Rack Oven accommodates a roll-in rack. It is equipped with an electronic oven control  
for baking and/or steaming applications. A mechanism in the oven ceiling rotates the rack during  
baking.  
Model HBA1G is rated at 180,000 Btu/hr, natural or propane gas.  
Model HBA2G is rated at 300,000 Btu/hr or 350,000 Btu/hr, natural or propane gas.  
Model HBA1E is rated at 34.2 kW.  
Model HBA2E is rated at 51.3 kW.  
Hobart Rack Ovens are produced with quality workmanship and material. Proper installation, usage  
and maintenance of your oven will result in many years of satisfactory performance.  
It is suggested that you thoroughly read this manual and carefully follow the instructions provided.  
INSTALLATION  
The Hobart HBA Rack Oven must be installed or moved only by authorized Hobart Bakery Systems  
trained service technicians.  
– 5 –  
OPERATION  
HBA ADVANCED CONTROLS  
– 6 –  
Control Guide - Advanced  
Button  
Action  
Display  
POWER  
Press to turn the oven  
ON or OFF.  
Control panel displays are lit when the oven is on. Oven  
defaults to Program 0. If oven is turned off and back on  
within 2 minutes, the oven will come up in the last mode  
and oven setting.  
AUTO ON/OFF  
TIMER  
Press to enter current time  
or time for oven to  
automatically turn on or  
off, when corresponding  
Auto On Time or Auto  
Off Time button is pressed.  
The AUTO ON/OFF TIMER window displays the current  
time, or the time the oven will automatically turn on or  
off.  
AUTO ON TIME  
AUTO OFF TIME  
TIMER ON/OFF  
SET TEMP  
Press to set the desired  
time of oven to  
automatically turn ON.  
The AUTO ON/OFF TIMER window displays the time  
the oven will automatically turn on.  
Press to set the desired  
time of oven to  
automatically turn OFF.  
The AUTO ON/OFF TIMER window displays the time  
the oven will automatically turn off.  
Press to turn the automatic  
timer ON or OFF.  
The indicator light beside the timer ON/OFF button is  
lit when the function is enabled.  
Press to set the desired  
temperature  
(5-degree increments).  
The SET TEMP window displays the set temperature.  
The HEAT ON light is lit while the oven is heating. The  
actual temperature in the oven cavity is displayed in the  
OVEN TEMP window.  
BAKE TIMER  
Press to enter  
the BAKE time  
(1-minute increments).  
The BAKE TIMER window displays the amount of time  
for the current baking cycle. The minutes set are the  
left two digits and minutes remaining are the right two  
digits. The windows can be set to display hours and  
minutes remaining. The ON light is lit when bake time  
is active. See Customized Operation to configure this  
setting.  
STEAM TIMER  
Press to enter the  
STEAM time  
(5-second increments in  
Bakery mode; 1-second  
increments in Food Service  
mode).  
The STEAM TIMER window displays the amount of  
time set for the steam cycle. The ON light is lit when  
the steam system is active.  
AIRFLOW  
DELAY  
Press to enter the  
DELAY time  
The DELAY TIMER window displays the amount of  
time set for the circulation blower delay cycle.  
(1-minute increments).  
Press to start the  
BAKE TIMER.  
The ON light blinks when the BAKE TIMER is active.  
– 7 –  
Control Guide - Advanced (cont)  
Button  
Action  
Display  
Press to stop the BAKE  
TIMER or silence the  
beeper after the BAKE  
TIMER has timed out.  
The ON light is off when the BAKE TIMER is inactive.  
PROGRAM  
STEP  
Press to select bake  
program.  
The PROGRAM window displays the number of the  
current program.  
Press to select one of  
four baking steps.  
The corresponding indicator light will be lit (1 to 4),  
depending on which step is selected.  
Press to open or  
close the vent.  
The indicator light above the VENT button is lit when the  
vent cycle is enabled.  
Auto On/Off Timer and Clock  
The Auto ON/OFF Timer display shows the current time of day. To set the clock, the control must be  
turned on. Press and hold either arrow button to initiate clock setting, then adjust time using arrow  
buttons. A few seconds after the time is adjusted, the colon in the time display will resume flashing.  
Timer Settings  
The oven can be set to turn itself on and off. After the AUTO ON/OFF TIMER is set, the POWER ON  
OFF button can be pressed to turn the oven off. This will not disrupt the AUTO ON/OFF setting.  
Electrical power to the oven must remain on.  
1. To set the oven to turn on, press and hold the AUTO ON TIME button. The previously entered  
start time will appear in the display. Use the UP and DOWN arrows to adjust the start time. Then  
release the AUTO ON TIME button.  
2. To set the oven to turn off, press and hold the AUTO OFF TIME button. The previously entered  
end time will appear in the display. Use the UP and DOWN arrows to adjust the end time. Then  
release the AUTO ON TIME button.  
3. To enable the automatic start, press and hold the TIMER ON/OFF button until the indicator LED  
to the right of the TIMER ON/OFF button is illuminated.  
NOTE: When using AUTO ON/OFF to preheat the oven, if the oven is not disturbed for the time set  
in parameter P17, it will revert to the Setback temperature stored in parameter P18 setup.  
Backup Battery  
The clock is backed up by a lithium battery which keeps the clock circuitry operating when all external  
power is off. If the battery becomes low or dead while the external power is off, the display will read  
12:00 (12 hr mode) or 0:00 (24 hr mode) and will not increment until a new time is set. The clock will  
operate with a dead or missing battery, but must be set each time external power is turned on. Batteries  
should be replaced when low or dead to avoid corrosive damage to the circuitry. Contact your local  
Hobart Bakery Systems service office.  
– 8 –  
Oven Preheat  
For best results, the oven must be preheated to bake temperature before baking begins.  
1. The door must be closed for oven to heat. The rack carrier will lift and rotate only during timed  
bake.  
NOTE: The rack carrier will be in the unload position from the last bake.  
2. Press the POWER ON OFF button to turn the oven on.  
3. Press the UP or DOWN arrows next to the SET TEMP window to enter the desired baking  
temperature. Actual temperature of the oven will appear in the OVEN TEMP window.  
4. Allow 50 minutes after the oven has reached the set temperature for the steam system to charge.  
5. The oven is now ready for baking operations.  
Basic Operation  
WARNING: THE OVEN AND ITS PARTS ARE HOT. TO PREVENT BURNS, USE HOT PADS OR  
PROTECTIVE MITTS WHEN LOADING OR UNLOADING THE OVEN.  
WARNING: HOT AIR AND STEAM ARE RELEASED FROM THE OVEN INTERIOR WHEN THE  
LOADING DOOR IS OPENED. TO AVOID BURNS, OPEN THE DOOR SLOWLY AND KEEP CLEAR  
OF THE OPENING.  
1. Preheat the oven. (See Oven Preheat) for HBA Advanced Controls.  
2. Manually select baking settings:  
Press the UP or DOWN arrows next to BAKE TIMER to enter the desired value.  
Press the UP or DOWN arrows next to STEAM TIMER to enter the desired value.  
Press the UP arrow next to AIRFLOW DELAY to enter the desired value.  
The steam and airflow delay settings are optional and can be left at 0 if desired.  
3. Slowly open the door and load product.  
4. Close the door and press the START button. The ON light in the BAKE TIMER window blinks as  
the timer counts down.  
5. Rack lifts from floor and rotates clockwise.  
6. The oven beeps after the BAKE TIMER times out. Press STOP to silence the beeper.  
7. Open door. Allow rack carrier to stop and lower. Remove product  
– 9 –  
Loading Procedure  
1. Type B and C rack carriers are equipped with stops on both ends. For B lifts, ensure stop flap is  
in the up position to load the rack on the rack carrier. For C lifts, push rack stop to the left after  
rack is loaded.  
2. Roll the rack into the oven so the end brackets channel onto the rack carrier. When using racks  
equipped with pan stops, load racks so stops will prevent movement of trays toward user when  
racks are unloaded.  
3. Close the loading door. The rack carrier will lift and rotate only during timed bake.  
Unloading Procedure  
WARNING: THE OVEN AND ITS PARTS ARE HOT. TO PREVENT BURNS, USE HOT PADS OR  
PROTECTIVE MITTS WHEN LOADING OR UNLOADING THE OVEN.  
WARNING: HOT AIR AND STEAM ARE RELEASED FROM THE OVEN INTERIOR WHEN THE  
LOADING DOOR IS OPENED. TO AVOID BURNS, OPEN THE DOOR SLOWLY AND KEEP CLEAR  
OF THE OPENING.  
1. Press STOP or open the loading door to silence the beeper.  
2. Wait for the rack carrier to stop and lower.  
3. For B lifts, push the rack stop down to unload the rack from the rack carrier. For C lifts, push rack  
stop to the right to open.  
4. Roll the rack from the rack carrier.  
5. Close the loading door.  
Cooling Oven  
To cool the oven more than 20 degrees below its current temperature; change SET TEMP to  
the desired new temperature, open the oven door, and press VENT. The SET TEMP display will  
alternate between ‘COOL’ and the SET TEMP until the oven has cooled. When the oven has  
reached the set temperature, the alarm will beep and the control will return to normal operation.  
Closing the oven door or pressing any control button during Cool-Down mode will also return  
the control to normal operation.  
The VENT control can provide a means of cooling down the oven. When the oven is in the OFF  
mode and the door is open, press the VENT button once to start or stop the circulation fan. Vent  
light will be lit. The fan will also stop when the door is closed or the oven is put into the ON mode.  
If the oven temperature is more than 20 degrees higher than the set temperature, and the bake  
timer is not activated, the oven will automatically open the VENT. The VENT will remain open  
until the oven temperature is within 20 degrees of the set temperature.  
Operational Hints  
On the initial startup, the oven temperature will default to the factory setting of 375°F (191°C)  
unless changed.  
During a baking cycle, the START and STOP buttons control the BAKE, STEAM and AIRFLOW  
DELAY settings only. They have no effect on the oven heat. When the BAKE TIMER times out,  
the oven heat stays at the set temperature. Care should be taken not to overbake products.  
To adjust the temperature during a baking cycle, press the UP or DOWN arrows in the Oven  
Temp section to enter the new temperature.  
– 10 –  
To adjust steam settings, press the corresponding arrows to enter the new values. The steam  
timer cannot be adjusted during bake operation.  
You can adjust the time remaining with the arrows. The set time remains unchanged unless you  
“0” out the remaining time.  
If the door is opened at any time during the baking cycle, the TEMP, BAKE TIME, STEAM and  
AIRFLOW DELAY settings will pause. Close the door to resume all functions.  
The AIRFLOW DELAY option minimizes airflow at the beginning of the baking cycle. The heat  
is off while the AIRFLOW DELAY is activated.  
The oven monitors the heating system by comparing the current oven temperature to the set  
temperature. If a problem arises in the heating system or there is a heating system failure, both  
temperature displays will flash. If the problem continues, contact your authorized Hobart Bakery  
Systems service agency.  
BACK-UP CONTROL OPERATION (OPTIONAL)  
If the main control panel ceases to function properly, baking can continue with the use of the Back-up  
Controls, if equipped. The Back-up Controls are located behind the control door on rear wall of the  
component panel.  
To activate the Back-up Controls, flip the toggle switch to BACK-UP position. Temperature and steam  
are now controlled by the thermostat dial and steam rocker switches, located on the back-up control  
panel. Set the thermostat dial to the desired temperature. Once the oven has reached temperature,  
steam can be injected by pressing and holding the steam rocker switch up to a maximum of 20 seconds.  
More than this will cool down the oven and steamer excessively. Venting the oven must be done  
manually by opening the door. The rack carrier will stop and lower when door is open. Close door after  
venting is complete for rack carrier to lift and resume rotating.  
SAFETY ALARM (STANDARD FEATURE, NO PARAMETER SETUP REQUIRED)  
If the temperature at the probe is in the range of 570 - 600 degrees Fahrenheit for 10 seconds, the unit  
will do the following:  
1. Shut off all features.  
2. Sound an alarm.  
3. Flash the OVEN TEMP display (actual temperature is displayed).  
4. Display the letters ‘SHdn’ in the BAKE TIMER display.  
The oven will remain in the shutdown mode until the 120VAC power is removed from the controller.  
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW  
LOCKOUT / TAGOUT PROCEDURES. THERE MAY BE MULTIPLE CIRCUITS. BE SURE ALL  
CIRCUITS ARE DISCONNECTED.  
WARNING: SHUT OFF GAS. CONTACT YOUR AUTHORIZED HOBART BAKERY SYSTEMS  
SERVICE OFFICE.  
– 11 –  
FOOD SERVICE STEAM MODE  
This mode can be used to provide steam on a periodic basis throughout operation. When this mode  
is enabled, the STEAM TIMER controls how many seconds of steam are provided to the oven, while  
a value entered in the Parameter 14 (P14) setup controls how frequently the steam is operated.  
To enable the Food Service Steam mode:  
1. Enter the parameter set up mode by pressing and holding the START button and POWER ON  
OFF button.  
2. Select Parameter 14.  
3. If the BAKE TIMER window displays ‘0’, it is set up for Bakery Mode (factory default). Press the  
UP or DOWN arrow buttons to enter FSS mode (display will change to a 3-digit number).  
4. Set the desired time between steam cycles using the UP or DOWN arrow buttons. The range is  
from 300 seconds (5 min.) to 990 seconds (approximately 17 min.), and increments by 10  
seconds at a time.  
5. After setting the desired cycle, press the POWER ON OFF button to save the settings.  
6. The STEAM TIMER will now operate in 1-second increments, up to 10 seconds, to set the duration  
of steaming.  
Examples:  
‘300’ is selected for P14  
‘3’ is entered in STEAM TIMER  
= steam is turned on for 3 seconds every 300 seconds (5 min.)  
‘990’ is selected for P14  
‘3’ is entered in STEAM TIMER  
= steam is turned on for 3 seconds every 990 seconds (17 min.)  
To return the oven to Bakery Mode, repeat the above process to access P14 and set the value in the  
BAKE TIMER window to ‘0’. The STEAM TIMER will now operate in 5-second increments.  
KOSHER OPERATION MODE (OVENS EQUIPPED WITH KOSHER PACKAGE)  
NOTE: The oven will be put into Kosher operation mode by authorized personnel at the time  
of start-up.  
For Kosher operations, the oven must maintain a minimum temperature in order to retain Kosher  
approval. The oven control will make the minimum set temperature 200°F in order to maintain minimum  
temperature requirements. Do not attempt to set the oven temperature below this point.  
If the oven temperature is at risk of falling below the approved range, a rapid beep alarm will sound  
(faster than the normal BAKE TIMER alarm). If you hear this alarm, do the following:  
Check that the oven door is closed.  
If the Vent mode is active, turn the Vent off.  
If the oven temperature falls below 150°F, the control will lock out. The display will read ‘LOC OUT’ and  
the unit will not operate. Authorized personnel must be contacted to restart the oven.  
If the control is inadvertently turned OFF while in kosher mode, when powered ON, the control will re-  
start in kosher mode as long as the temperature has not dropped below the minimum requirements.  
– 12 –  
PROGRAMMING THE OVEN  
Single Step Programming  
The program menu stores up to 99 programs that can be recalled by number when needed. A program  
is a set of baking instructions (temperature, bake, steam and airflow delay settings) that the operator  
defines for any baking operation.  
1. With the oven in the OFF mode, press and hold the UP arrow in the STEPS section. While  
pressing and holding the UP arrow, press the POWER ON OFF button for 3 seconds. When the  
beep sounds, the oven is in program mode.  
2. Press the PROGRAM UP or DOWN arrows until the program number that is desired is displayed.  
3. Press the TEMP UP or DOWN arrows to enter the desired temperature.  
4. Set the Bake, Steam, Delay Airflow and Vent settings:  
Press the UP or DOWN arrows next to BAKE TIMER to enter the desired time.  
Press the UP or DOWN arrows next to STEAM TIMER to enter the desired time.  
Press the UP arrow next to AIRFLOW DELAY to enter the desired time.  
NOTE: Steam and airflow delay settings are optional and can be left at 0 if desired.  
Press the VENT button to vent the cavity for the entire time of the step. When step is  
complete, vent will close.  
5. To store the program, press the PROGRAM UP or DOWN arrows to move to the next program  
number or press the POWER ON OFF button to exit the program mode. To store additional  
program settings, repeat steps 2 to 4.  
6. Record program numbers, and product associated with them, on the bake card supplied with the  
oven.  
– 13 –  
Multi-Step Programming  
Additional programs or steps can be entered within the original program number. Up to four individual  
steps can be added by the operator, each with different bake settings.  
For example, Program 1 has temperature, bake, steam and delay time settings set by the operator.  
This is known as Step 1. After the timer times out in Step 1, the oven automatically starts the  
programmed bake settings in Step 2. The system continues with each step until all steps have been  
timed out.  
1. With the oven in the OFF mode, press and hold the UP arrow in the STEPS section. While  
pressing and holding the UP arrow, press the POWER ON OFF button for 3 seconds. When the  
beep sounds, the oven is in program mode.  
2. Press the PROGRAM UP or DOWN arrows until the program number that is desired is displayed.  
The Step 1 light is lit.  
3. Press the TEMP UP or DOWN arrows to enter the desired temperature.  
4. Set the Bake, Steam, Delay Airflow and Vent settings:  
Press the UP or DOWN arrows next to BAKE TIMER to enter the desired time.  
Press the UP or DOWN arrows next to STEAM TIMER to enter the desired time.  
Press the UP arrow next to AIRFLOW DELAY to enter the desired time.  
NOTE: The steam and airflow delay settings are optional and can be left at 0 if desired.  
Press the VENT button to vent the cavity for the entire time of the step. When step is  
complete, vent will close.  
5. Press the UP arrow in the STEPS section to advance to the next step within the program. The  
selected step light is lit. Repeat steps 3 and 4 above to set each step, if needed, in the program.  
6. To store all the steps in the program, press the PROGRAM UP or DOWN arrows to move to the  
next program number, or press the POWER ON OFF button to exit the program mode.  
– 14 –  
Changing the Programs  
1. With the oven in the OFF mode, press and hold the UP arrow in the STEPS section. While  
pressing and holding the UP arrow, press the POWER ON button for 3 seconds. When the beep  
sounds, the oven is in program mode.  
2. Press the PROGRAM UP or DOWN arrows until the program number that is desired is displayed.  
3. Enter the new Bake, Steam and Delay Airflow settings:  
Press the UP or DOWN arrows next to BAKE TIMER to enter the desired time.  
Press the UP or DOWN arrows next to STEAM TIMER to enter the desired time.  
Press the UP arrow next to AIRFLOW DELAY to enter the desired time.  
NOTE: The steam and airflow delay settings are optional and can be left at 0 if desired.  
4. To change the settings in a Step, press the UP arrow in the STEPS section and make changes  
in each step accordingly.  
5. To store the program, press the PROGRAM UP or DOWN arrows to move to the next program  
number or press the POWER ON OFF button to exit the program mode.  
– 15 –  
Using the Programs  
1. Press the PROGRAM UP or DOWN arrows to select the desired program number (1-99). The  
TEMP, BAKE, STEAM and AIRFLOW DELAY settings are displayed.  
2. Confirm that the oven is at the set baking temperature.  
3. Slowly open the doors. Wait for the rack lifting device to come to a stop.  
4. Roll the rack into the oven so the end brackets channel onto the rack lifting carrier. (See Loading  
Procedure.)  
5. Close and latch the door.  
6. Press START. A beeper will sound after the BAKE TIMER times out. Press STOP to silence the  
beeper.  
Program Hints  
The oven defaults to the Program 0 settings when first turned on. Program 0 settings are as  
follows: Temp = 375°F, Bake Timer = 0, Steam Timer = 0, Delay Timer = 0, Program = 0.  
Any combination of bake settings can be manually entered for one-time custom baking  
operations. These settings are not saved to the program memory.  
If any of the baking parameters are changed in a program before or during a bake cycle, the  
oven reverts to a manual program (Program 0).  
The PROGRAM UP and DOWN arrows have no effect while the bake cycle is in progress.  
However, if the BAKE TIMER has been stopped, either by pressing the STOP button or by  
opening the door, then pressing the PROGRAM UP and DOWN arrows will select a new  
program and cancel the baking cycle that was in progress.  
When selecting programs, the system will skip over unprogrammed numbers. For example, if  
Program 1 is displayed in the PROGRAM window and no programs are stored in 2, 3 and 4, then  
the system will skip over 2, 3 and 4. Program 5 will be the next program displayed.  
– 16 –  
CUSTOMIZED OPERATION  
The HBA oven standard and advanced controls have the capability of being customized to fit your own  
personal needs using the setup mode.  
Before entering the setup mode, read all the instructions to make sure you are completely clear on what  
to do. If you need assistance, please call your authorized Hobart Bakery Systems service office.  
Entering Setup Mode  
With the oven in the OFF mode, press and hold the START button. While pressing and holding the  
START button, press the POWER ON OFF button for 3 seconds. The oven is now in Setup mode and  
P1 is displayed in the SET TEMP window.  
Changing Items in Setup Mode  
The number in the SET TEMP window is the setup number. The BAKE TIMER window displays the  
setup item (the settings that can be changed).  
1. To change the setup number, press the SET TEMP UP or DOWN arrows. The setup item will be  
displayed in the BAKE TIMER window.  
2. To make a change in the setup item being displayed, press the BAKE TIMER UP or DOWN  
arrows. To adjust the setting, see Setup Guide. Do not attempt to change item numbers P4, P5  
and P8. Consult your authorized Hobart Bakery Systems service office for help with these  
features.  
3. To exit the setup mode, press the POWER ON OFF button.  
– 17 –  
Setup Guide  
Setup  
Number  
Setup Item  
Display  
P1  
Maximum Temperature  
Setpoint  
This is the maximum temperature at which the oven can be  
set. Range is 50°F to 525°F (10°C to 274°C).  
P2  
Preheat Temperature  
This is the default temperature setpoint when the oven is  
first turned on (Program 0). The preheat temperature cannot  
be set higher than the value in P1. Range is 50°F to 525°F  
(10°C to 274°C).  
P3  
P4  
Minimum Temperature  
Setpoint  
This is the minimum temperature at which the oven can be  
set. Range is 50°F to 200°F (10°C to 93°C).  
Temperature Offset  
This value permits an offset of correction between the  
temperature probe and the real baking chamber temperature.  
Call your authorized Hobart Bakery Systems service agency  
for help with this feature.  
P5  
P6  
Heat OFF Offset  
This value adjusts the temperature difference between the  
set point and stopping of the heating system. Call your  
authorized Hobart Bakery Systems service agency for help  
with this feature.  
Heat Difference Hysteresis  
This value adjusts the temperature difference between the on  
temperature and off temperature of the heating system. Call  
your authorized Hobart Bakery Systems service agency for  
help with this feature.  
P7  
P8  
Maximum Steam Time  
Temperature Units  
Time set is the maximum time (in seconds) that water is  
supplied during the STEAM TIMER operation.  
The oven can be set to display temperature in Fahrenheit or  
Celsius. To ensure accurate temperature parameters, call  
your authorized Hobart Bakery Systems service agency for  
help with this feature.  
P9  
Bake Timer Mode  
The BAKE TIMER can be set up to display minutes set/  
minutes remaining or hours and minutes. Select 0 for minutes  
set/minutes remaining or 1 for hours and minutes. (If this  
parameter is changed to hours and minutes, a label has been  
provided to place on the control panel to indicate the change.)  
P10  
Vent Evacuate Time  
Time set is the time (in seconds) that the vent is 100% open  
at the beginning of the venting cycle. Range is 0 to 180  
seconds.  
P11  
P12  
P13  
Vent Open Percentage  
This value is the percentage the bake chamber vent is open  
after the vent evacuate time has expired. Range is 5 to 100%.  
End of Bake Automatic  
Vent - Enable  
This feature enables the Automatic Vent Cycle. Select 0 to  
disable or 1 to enable this feature (see P13 for entering time).  
End of Bake Automaitc  
Vent Time  
This is the number of minutes before the end of the bake  
cycle that the vent is open.  
– 18 –  
Setup Guide (cont)  
Setup  
Number  
Setup Item  
Display  
P14  
Steam Timer Mode  
The STEAM TIMER can be set up to display in seconds or  
operate in food service mode. Select 0 for seconds or  
300 to 990 for food service mode.  
P15  
P16  
Interior Light Brightness  
Clock Operation  
This value is the brightness of the interior lights. The higher  
the number, the brighter the lights. Range is 50 to 100.  
This selects either 12 hours (AM/PM) or 24 hours real time  
display. Press the Bake Time Up button to switch between  
the two types of display.  
P17  
P18  
Temperature Setback Time  
Setback Temperature  
This selects the elapsed time from the last timed bake to  
when the oven will lower the oven set temperature to the  
value set in P18. Range is 10 to 180 minutes.  
This selects the oven set temperature that the oven will  
change to when the temperature setback time has been  
exceeded in P17. Range is 50°F to 300°F (10°C to  
149°C).  
P19  
Lights Mode  
Select 1 for lights on continuously (when oven is on) or  
select 0 for automatic operation. Lights will turn off  
automatically after 30 minutes of no user activity (door  
opened or closed, no buttons pushed).  
SHUTDOWN  
NOTE: Before restarting a gas oven, power switch and gas burner valve must be off for a minimum  
of 5 minutes.  
1. Remove all remaining product.  
NOTE: Vent can be used to cool the oven.  
2. Press the POWER ON OFF button.  
3. Clean the baking chamber. (See Cleaning.)  
4. For lengthy shutdowns, disconnect the main power and shut off the gas and water supply.  
RESTARTING OVEN  
NOTE: Before restarting a gas oven, power switch and gas burner valve must be off for a minimum  
of 5 minutes.  
1. Press the POWER ON OFF button to turn the oven on.  
2. Press the UP or DOWN arrows next to the SET TEMP window to enter the desired temperature.  
– 19 –  
CLEANING  
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW  
LOCKOUT / TAGOUT PROCEDURES. THERE MAY BE MULTIPLE CIRCUITS. BE SURE ALL  
CIRCUITS ARE DISCONNECTED.  
WARNING: THE RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING,  
SERVICING OR CLEANING THE RACK OVEN.  
WARNING: HOT AIR AND STEAM ARE RELEASED FROM THE OVEN INTERIOR WHEN THE  
LOADING DOOR IS OPENED. TO AVOID BURNS, OPEN THE DOOR SLOWLY AND KEEP CLEAR  
OF THE OPENING.  
Allow the oven to cool.  
Clean the outside of the oven daily with a clean, damp cloth.  
Remove rack(s) and clean as you would any cooking utensil. Use warm, soapy water and a  
brush. Rinse with clear water and dry with a clean cloth.  
Use care when cleaning around sensitive interior parts such as probes, sensors or the rotating  
mechanism.  
Using a clean cloth and warm, soapy water, wash the stainless steel interior of the oven. Rinse  
with clear water and dry with a clean cloth.  
Gently scrape heavy buildup off door glass. Residue can be removed with a glass cleaner when  
oven is cool.  
Clean hood filters (if equipped) with soap and warm water.  
Do not use oven cleaners or steel wool on stainless steel surfaces. Never spray down the oven  
with water or steam.  
Never use cleaners that contain chlorine. Chlorine corrodes stainless steel.  
– 20 –  
MAINTENANCE  
WARNING: THE RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING,  
SERVICING OR CLEANING THE OVEN.  
WARNING: HOT AIR AND STEAM ARE RELEASED FROM THE OVEN INTERIOR WHEN THE  
LOADING DOOR IS OPENED. TO AVOID BURNS, OPEN THE DOOR SLOWLY AND KEEP CLEAR  
OF THE OPENING.  
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW  
LOCKOUT / TAGOUT PROCEDURES. THERE MAY BE MULTIPLE CIRCUITS. BE SURE ALL  
CIRCUITS ARE DISCONNECTED.  
On gas ovens, annually check the flue to be sure it is free of obstructions.  
GENERAL  
As Needed  
Inspect the area around the oven. The area must be free and clear from combustibles. There  
must be no obstructions to the air flow.  
Daily  
Clean Exterior (See Cleaning).  
Weekly  
Clean the oven interior and remove loose debris (See Cleaning).  
Clean the windows.  
Empty grease catcher (if equipped).  
Monthly  
Clean exhaust hood filters (if equipped) with soap and water.  
Bi-Monthly  
Owner Preventive Maintenance Procedure.  
PREVENTIVE MAINTENANCE  
The HBA Rack Oven should be kept on a regular preventive maintenance schedule. Ovens require  
specific preventive maintenance based on usage and environmental factors. The failure to have the  
oven properly maintained by following recommended preventive maintenance procedures may result  
in higher repair costs, shortened equipment life, or unsafe operating conditions.  
The performance of routine preventive maintenance on any rack oven, which is the owner’s  
responsibility, will help to ensure continued safe and reliable operation.  
A preventive maintenance program is your best option for continued safe and reliable oven operation.  
We believe that Hobart Service is your best choice for performing preventive maintenance.  
SERVICE AND PARTS INFORMATION  
Contact your authorized Hobart Bakery Systems service office.  
– 21 –  
TROUBLESHOOTING  
BURNERS WILL NOT LIGHT ON GAS OVEN  
1. Check that door is shut.  
2. Press the OFF button to turn the oven off and wait 5 minutes.  
3. Make sure the gas shutoff valve is in the ON position.  
4. Press the ON button to turn the oven back on.  
If the above suggestions do not remedy the problem, contact a Hobart Bakery Systems service office.  
ALARMS AND DISPLAY MESSAGES  
Alarm or Message  
Cause  
Action  
Temperature display changes  
between a number and ‘COOL’.  
Cool Down mode is active.  
To return to normal mode, close oven  
door.  
Display is flashing with no  
beeping, while oven is in a timed  
bake cycle and is calling for heat.  
Temperature recovery alert. Open oven door and close to reset heat  
control. If unit does not begin heating  
contact your local Hobart Service office.  
Display shows ‘SHdn’.  
Safety Alarm has disabled  
oven.  
TURN OFF ALL POWER AND GAS TO  
THE OVEN. Do not use oven. Contact  
your local Hobart Service office.  
Control beeps continuously.  
Rack Rotation alert.  
Check that rack is rotating; check for  
pans that may be protruding from rack. If  
problem persists contact your local  
Hobart Service office.  
Controls beeps rapidly (faster  
beep than Baker Timer).  
Temperature alert for  
Kosher Mode.  
Turn VENT off, if activated. Gas ovens:  
check that burner is firing. If not firing,  
briefly open door and close to reset  
temperature control.  
Contact your local Hobart Service office.  
Display shows ‘LOC OUT’.  
Oven in Kosher Lock-Out  
Mode.  
OTHER TROUBLESHOOTING TOPICS  
Condition  
Cause  
Action  
Oven circulation fan is running  
but oven is turned off.  
Oven is in Cooling mode.  
Close oven door to cancel cooling  
mode. If door was not open, contact  
your local Hobart Service office.  
STEAM TIME cannot be set  
above 10 seconds, and time  
increments by 1-second.  
Oven is in Food Service  
mode.  
See Food Service Mode instructions to  
return oven to Bakery mode.  
Rack does not lift and rotate.  
Bake time has not been  
entered in timer and/or  
timer has not been  
started.  
Enter time in BAKE TIMER and press  
START. If problem persists, contact  
your local Hobart Service office.  
– 22 –  
OWNER PREVENTIVE MAINTENANCE PROCEDURE  
INTRODUCTION  
This customer preventive maintenance (PM) section includes procedures to inspect for proper  
operation and cleaning of components. Owner Preventive Maintenance Procedures are written for gas  
ovens. They can also be used for electric ovens by omitting the steps that refer to components found  
only on gas ovens. Customer PMs should be conducted bi-monthly per OSHA Bakery Oven Inspection  
Standard 29 CFR 1910.263(l)(9)(ii). A convenient PM Checklist is provided at the end of this section.  
NOTE: This PM procedure does not discuss repair or replacement of components. Upon completion  
of the PM procedure you will need to contact a qualified servicer for any needed repairs.  
Tools Used For Inspection Procedure  
• Standard set of hand tools  
• Vacuum cleaner - shop vac  
PREVENTIVE MAINTENANCE PROCEDURE  
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW  
LOCKOUT / TAGOUT PROCEDURES. THERE MAY BE MULTIPLE CIRCUITS. BE SURE ALL  
CIRCUITS ARE DISCONNECTED.  
WARNING: SHUT OFF THE GAS BEFORE SERVICING THE UNIT.  
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR  
MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION  
AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND  
FOLLOW LOCKOUT / TAGOUT PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY  
POWER TO TEST.  
Inspect Oven Lamps  
1. Lamps should be on when oven is powered.  
2. If not, replace lamps (Fig. 1).  
A. Remove lens cover by turning out of lamp housing.  
B. Remove oven lamp by turning lamp out of lamp  
socket.  
3. Reverse the procedure to install new lamps.  
Fig. 1  
– 23 –  
Clean and Vacuum Components and Control/Burner Compartment Area (Gas Only)  
1. Clean the control/burner compartment (Fig. 2) area of dust and/or lint accumulation.  
2. Vacuum the control/burner compartment floor of dust and/or lint accumulation.  
3. Gain access to the top of oven and clean dust that may have accumulated on top of circulation  
blower motor (Fig. 3) and motor cooling fan.  
Fig. 3  
Fig. 2  
Rack Lift and Rotation Assemblies  
1. Check rack lift assembly for proper operation.  
A. Open door. Rack lift should lower to correct height of rack and be in forward loading position  
to accept rack entry.  
B. The oven rack should be easily rolled in and out of oven and the wheels completely off the  
oven floor when raised.  
2. Tighten all set screws (4) in carrier (Fig. 4).  
A. Check and tighten all set screws on carrier.  
Fig. 4  
– 24 –  
Inspect Door Components  
1. Check loading door latch.  
A. Check door gasket for good condition. If door gasket needs replacement, contact your local  
Hobart office for service.  
B. Check loading door latch. Latch must fully extend (Fig. 5) when door is closed and  
contacting door gasket. Leave about 1/8" gap for heat expansion.  
C. Adjust strike in or out as required by loosening one screw (Fig. 6) on each side of strike.  
D. Tighten screws.  
Fig. 6  
Fig. 5  
2. Check door sweep.  
A. The door sweep should hit the floor  
approximately 1/8" evenly across door  
width, when door is in the closed position.  
B. Turn oven on.  
C. If air (or steam) blows out from underneath  
the door, door will need to be adjusted. If  
door sweep needs replacement or  
adjustment, contact your local Hobart  
office for service.  
3. Check interior door release (Fig. 7) for proper  
operation.  
Fig. 7  
4. Check door switch for proper operation.  
A. When door switch actuator rod is in the  
down position (door open), the rod should  
extend 3/8" to 7/16" from the underside of  
the header and easily slide up ramp as  
door is closed (Fig. 8). Slide ramp should  
be positioned as shown. If not,  
re-form ramp as necessary.  
Fig. 8  
– 25 –  
Inspect Air Louvers  
1. Check air louvers (shutters) (Fig. 9) inside oven and tighten any loose screws.  
2. Check oven interior, tighten or replace loose or missing panel screws. Also check floor anchors.  
Inspect Cavity Vent  
1. Check cavity vent for proper operation.  
A. Push VENT (Fig. 10) button on control panel to open vent and then push again to close  
vent.  
B. Visually check that vent opens (Fig. 11) and closes (Fig. 12) when button is pressed.  
Fig. 10  
Fig. 9  
Fig. 12  
Fig. 11  
Visually Inspect Electrical Connections  
1. Inspect all wiring connections for discoloration. If discoloration is visible, contact your local Hobart  
Bakery Systems service.  
– 26 –  
Verify Ignition Module Safety Lockout Functions (Gas Only)  
1. Verify ignition module safety lockout functions.  
A. Turn off main gas supply to the oven.  
B. Open control panel door to gain access to burner  
compartment area.  
C. Turn the oven on.  
D. Set the oven to call for heat and make sure  
convection fan is running.  
E. Observe LED light through hole in control box  
cover (Fig.13). After trying to light the burner  
three times, the module should lockout. (See  
chart below.)  
F. Turn main gas supply to the oven back on.  
G. Set the oven to call for heat, making sure  
convection fan is running and the burner has  
established a flame.  
H. Turn off main gas supply to the oven.  
Fig. 13  
I. Observe LED light through hole in control box  
cover (Fig.13). The ignition module should go  
into lockout. (See chart below.)  
LED DIAGNOSTIC INDICATOR CODES  
LED  
LED off  
LED  
No Fault  
LED illuminated  
'1' Flash  
Module Fault  
Air Flow Fault  
'2' Flash  
Flame Fault No Call for Heat  
Ignition Module Lockout  
'3' Flash  
J. If the results have been obtained, proceed to  
step 2.  
K. If the results have not been obtained, contact your  
local Hobart Systems Service office.  
2. Verify hood exhaust air pressure switch (Fig. 14)  
operation.  
A. Set oven control to call for heat and make sure  
convection fan is running.  
B. Disconnect tubing from exhaust vent collar. Burner  
flame should go out.  
Fig. 14  
C. Reconnect tubing. Burner should establish a flame.  
If not, contact your local Hobart Bakery Systems  
service office.  
– 27 –  
3. Verify draft inducer pressure switch (Fig. 15) operation.  
A. Set oven control to call for heat and make sure convection fan is running.  
B. Disconnect tubing from draft inducer pressure switch (Fig. 15). Burner flame should go  
out.  
C. Reconnect tubing. Burner should establish a flame. If not, contact your local Hobart  
Bakery Systems service office.  
Fig. 15  
Verify Operation of Steam  
1. Check steam system for proper operation.  
A. Turn the water supply on.  
B. Turn oven on and set to normal bake temperature.  
C. Allow to cycle three times to stabilize temperature.  
D. Set control to call for steam.  
E. Observe operation. If steam is not observed, contact your local Hobart Bakery Systems  
service office.  
After completion of the owner PM procedure, you will need to contact a qualified servicer for  
any needed repairs.  
Keep a copy of the Owner Preventive Maintenance Checklist for your records.  
– 28 –  
MODEL/SERIAL NUMBERS  
COPY AS NEEDED  
RECOMMENDED OWNER  
PREVENTIVE MAINTENANCE CHECKLIST  
BAKERY RACK OVENS - GAS  
CHECK FOR PROPER OPERATION OR CLEAN.  
CALL FOR SERVICE AS NECESSARY  
Inspect oven lamps  
Clean and vacuum components and burner areas  
Inspect rack lift and rotation assemblies  
Inspect door components  
Inspect air louvers  
Inspect cavity vent  
Visually inspect electrical connections  
Verify ignition module safety lockout functions  
Verify operation of steam  
√ =PROCESS COMPLETED  
PM Frequency:  
Type of Gas  
Bi-monthly  
Natural Gas _____________  
Propane_____________  
Location: ________________________________  
Inspector: ________________________________  
Store No.  
_____________________________  
Date Completed: _____________________________  
Service Notified for Necessary Repairs: _____________________  
(Date)  
Comments:  
(Inspector Signature)  
– 29 –  
NOTES  
– 30 –  
NOTES  
– 31 –  
NOTES  
– 32 –  
FORM 36801 (May 2005)  
PRINTED IN U.S.A.  

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