MODELS HO300G AND HO300E MINI ROTATING RACK OVENS MODEL HO300E (ELECTRIC) HO300G (GAS) ML-132177 ML-132178 701 S. RIDGE AVENUE TROY, OHIO 45374-0001 937 332-3000 www.hobartcorp.com FORM 36705 (Oct.
IMPORTANT FOR YOUR SAFETY THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL GAS EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD START-UP AND ADJUSTMENTS OF THE EQUIPMENT COVERED BY THIS MANUAL. POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THE EVENT THE SMELL OF GAS IS DETECTED. THIS INFORMATION SHOULD BE OBTAINED FROM THE LOCAL GAS SUPPLIER.
TABLE OF CONTENTS GENERAL .............................................................................................................................................4 INSTALLATION ....................................................................................................................................4 Unpacking ........................................................................................................................................4 Location .......................................
OPERATION AND CARE OF MODELS HO300G AND HO300E MINI ROTATING RACK OVENS KEEP THIS MANUAL FOR FUTURE USE GENERAL Models HO300G (Gas) and HO300E (Electric) Mini Rotating Rack Ovens feature the choice of two rack configurations: • Eight 18" x 26" (45.7 cm x 66 cm) pan capacity rack with 4" (10.2 cm) slide spacing • Six 18" x 26" (45.7 cm x 66 cm) pan capacity rack with 5.31" (13.5 cm) slide spacing Both oven rack options can be ordered in an end-load or side-load design.
LOCATION The HO300G and HO300E Mini Rotating Rack Ovens must have the following minimum clearances to combustibles: • Back and sides: 0" • Bottom: 0" • Top: 18" (45.7 cm) NOTE: Minimum 24" clearance needed for service access on the right side. If right side is within 30" of radiant heat or grease vapor source, vent guard is required. Be sure that electrical, water and drain connections are accessible and can be made per local and national codes.
GAS CONNECTIONS CAUTION: Gas supply connections and any pipe joint compound must be resistant to the action of propane gases. The HO300G is an indirect gas-fired oven, consisting of a heat exchanger with eight independent, U-shaped tubes, each with a separate in-shot burner rated at 11,875 BTU/hr for a total input of 95,000 BTU/hr. 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.
DRAIN CONNECTIONS Connect a 1/2" drain line to the 1/2" NPT drain connection located at the rear of the oven. Route the drain line to a floor drain, allowing a minimum 1" air gap between the drain line outlet and floor drain. If oven is being installed on an HPC800 Proofing Cabinet, it is recommended that separate drain lines be provided. If it is necessary to interconnect the oven and proofer drains, provide a vent opening in the drain line above the oven drain connection location.
OPERATION WARNING: THE MINI-RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, SERVICING OR CLEANING THE OVEN.
Control Guide Button POWER Action Display 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.
Control Guide (cont) Button PROGRAM STEP 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. Press the arrow keys to select a bake program. The PROGRAM window displays the number of the current program. Use to enter bake programs. The corresponding indicator light will be lit (1 to 4), depending on which step is selected. Press to open or close the vent.
Auto ON/OFF Timer Setting Clock 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 of the arrow buttons until the colon between the hours and minutes display stops blinking. Use the up and down arrow buttons to adjust time of day. After 5 seconds of no use, the colon will start to blink again. The oven can be set to turn itself on and off.
Oven Preheat For best results, the oven must be preheated to bake temperature before baking begins. 1. Press the POWER ON OFF button to turn the oven ON. 2. Press the UP or DOWN arrows in the TEMP section to enter the desired baking temperature. 3. Confirm that the doors are closed. 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.
Operational Hints • On the initial startup, the oven temperature will default to the factory setting of 375°F (191°C) unless changed using customized operations. • 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.
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 setup mode. (See Entering Setup Mode.) 2. Select Parameter 14. 3.
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.
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.
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.
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 to come to a stop. 4. Load product into oven. 5. Close the doors. 6. Press START. A beeper will sound after the BAKE TIMER times out. Press STOP to silence the beeper. 7. Check product for doneness.
CUSTOMIZED OPERATION The Mini-Rack oven 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 agency. Entering Setup Mode With the oven in the OFF mode, press and hold the START button.
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 Minimum Temperature Setpoint This is the minimum temperature at which the oven can be set.
Setup Guide (cont) Setup Number Setup Item Display P14 Steam Timer Mode The STEAM TIMER can be set up to function in Bakery mode "0" (single steam function at the beginning of step/cycle) or Food Service mode "300 to 990" seconds interval between steam functions. P15 Interior Light Brightness This value is the brightness of the interior lights. The higher the number, the brighter the lights. Range is 50 to 100.
SHUTDOWN NOTE: Before restarting a gas oven, power and gas burner valve must be off for a minimum of 5 minutes. 1. Remove all remaining product. NOTE: Vent can be used to evacuate steam from oven. 2. Allow the oven to cool, then 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. CLEANING WARNING: THE MINI-RACK OVEN AND ITS PARTS ARE HOT.
ACCESSORIES - HPC800 PROOFING CABINET The HO300 Mini Rotating Rack Oven can be ordered with the optional HPC800 Proofing Cabinet. The proofer is mounted on four casters (two front-swivel and two rear-fixed). The HPC800 Proofer has a 16-pan capacity that accommodates 18" x 26" (45.7 cm x 66 cm) baking trays with 3" (7.6 cm) slide spacing. Temperature and humidity can be set independently to meet your particular proofing needs.
DIMENSIONS AND SERVICE CONNECTION DIAGRAM NOTE: The proofer must be wired separately from the oven.
CONTROLS Proofing 1. Turn the power switch to the ON position. 2. Turn the temperature knob to the desired setting. 3. Turn the humidity knob to the desired setting. 4. Allow 15 to 20 minutes for the proofer to reach set temperature and humidity. 5. Load the product in the proofer. 6. Turn the power switch to the OFF position when done. Proofing Hints Controlled temperature and humidity in the proofer promotes yeast fermentation, which generates gas and causes the dough to rise.
MAINTENANCE WARNING: THE MINI-RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, SERVICING OR CLEANING THE OVEN. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE OVEN AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. 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 NOTE: Do not change air shutter settings when cleaning oven interior.
TROUBLESHOOTING The oven has been set at the factory to bake assorted product, such as bagels, cookies and muffins. If your bake is uneven, the shutters may need to be adjusted to achieve the desired results. Contact your authorized Hobart Bakery Systems service agency for assistance. BURNERS WILL NOT LIGHT (GAS OVENS ONLY) 1. Press the ON/OFF button to turn the power OFF and wait 5 minutes. 2. Make sure the gas shutoff valve is in the ON position. 3. Press the ON/OFF button to turn the oven ON.
OWNER PREVENTIVE MAINTENANCE PROCEDURES 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).
Inspect Oven Lamps 1. Lamps should be on when oven is powered. 2. If not, replace lamps. A. Unscrew lamp cover (Fig. 1) to disengage from lamp sockets. Remove lamp from socket. 3. Reverse procedure to install new lamps. Clean and Vacuum Components and Burner Area 1. Clean the burner chamber (Fig. 2) area of dust and/or lint accumulation. A. Remove screw securing control panel door and swing door open to access burner chamber area. B. Vacuum the burner chamber area of dust and/ or lint accumulation.
Inspect Rack Rotation Assemblies NOTE: Before performing rack inspection, observe condition of rack rotation belt. 1. Check rack rotation belt. A. Gain access to the top of oven and loosen the screws securing rack rotation assembly cover (Fig. 5). B. Lift cover from top of oven. C. Observe condition of the rack rotation belt. If belt is worn or damaged, contact your local Hobart Bakery Systems service office. D. Reverse procedure to install. 2. Check rack assembly for proper operation. A.
Inspect Cavity Vent 1. Check cavity vent for proper operation. A. Push VENT button (Fig. 7) on control panel to open vent and push again to close vent. B. Visually check that vent opens (Fig. 8) and closes (Fig. 9) when button is pushed. If vent does not operate, contact your local Hobart Bakery Systems service office. Fig. 7 Fig. 8 Fig. 9 Visually Inspect Electrical Connections 1. Remove screw securing control panel door and swing door open to access burner compartment area. 2.
Verify Ignition Module Safety Lockout Functions 1. Verify ignition module safety lockout functions. A. Turn the oven on and close the doors. B. Turn off gas supply to oven. C. Set the oven control to call for heat, make sure convection fan is running. D. Remove screw securing control panel door and swing door open to access burner compartment area. E. Observe LED on ignition module. After trying to light the burner, the module should lockout (See following chart.) F.
2. Verify operation of draft inducer pressure switch. A. Turn incoming power off to oven. B. Remove screw securing control panel door and swing door open to access burner compartment area. C. Loosen hose clamp (Fig. 11) and remove vacuum tube from the vacuum switch. NOTE: Some ovens may have rectangular-shaped vacuum switches. D. Reconnect incoming power to oven and turn oven on. E. Set oven to heat and press START. F. The burners should not come on at this time. G.
Verify Operation of Steam 1. Check steam system for proper operation. A. Turn the water supply on. B. Turn the 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 Procedures, you will need to contact a qualified servicer for any needed repairs.
MODEL/SERIAL NUMBERS COPY AS NEEDED RECOMMENDED OWNER PREVENTIVE MAINTENANCE CHECKLIST BAKERY RACK OVENS - GAS CHECK FOR PROPER OPERATION OR CLEAN.
FORM 36705 (Oct. 2005) – 36 – PRINTED IN U.S.A.