O
P
E
R
A
T
I
O
N
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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