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Manual Hobart ML-132178

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  • Hobart ML-132178 - page 1

    701 S. RIDGE AVENUE TROY, OHIO 45374-0001 937 332-3000 www.hobartcorp.com N S T R U C T I O N S I FORM 34576 Rev. B (Nov. 2003) MODELS HO300G AND HO300E MINI R O T A TING RA CK O VENS MODEL HO300E (ELECTRIC) ML-132177 HO300G (GAS) ML-132178 ...

  • Hobart ML-132178 - page 2

    IMPORT ANT FOR Y OUR 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 CAN BE OBTAINED FR ...

  • Hobart ML-132178 - page 3

    – 3 – TABLE OF CONTENTS GENERAL ............................................................................................................................................. 4 INSTALLATION .................................................................................................................................... 4 Unpacking ............ ...

  • Hobart ML-132178 - page 4

    – 4 – INST ALLA TION, OPERA TION AND CARE OF MODELS HO300G AND HO300E MINI R O T A TING RA CK O VENS KEEP THIS MANU AL 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) s ...

  • Hobart ML-132178 - page 5

    – 5 – 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) Be sure that electrical, water and drain connections are accessible and can be made per local and national codes. The equipment area must be kept fr ...

  • Hobart ML-132178 - page 6

    – 6 – ASSEMBLY The oven must be installed on a stand, proofer cabinet, or any noncombustible surface. The oven must be sealed to the stand proofer surface with an NSF-approved sealant, such as Dow Corning 732 or GE RTV108. Secure the oven to the proofer or stand using the provided tie-down brackets, which mount on the rear of the oven. (See Acc ...

  • Hobart ML-132178 - page 7

    – 7 – 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. 1 . Ve ...

  • Hobart ML-132178 - page 8

    – 8 – VENTILATION Ventilation requirements will vary with each installation and must comply with applicable portions of the National Fire Protection Association Standard #96 and with local codes. Exhaust Fan Interlock A connection point (maximum 5-amps) is provided for Indirect Vent (Exhaust Hood) or optional Direct Vent (Draft Hood). It is loc ...

  • Hobart ML-132178 - page 9

    – 9 – PLUMBING CONNECTIONS WARNING: PLUMBING CONNECTIONS MUST COMPLY WITH APPLICABLE SANITARY, SAFETY AND PLUMBING CODES. Oven water supply should have a hardness of 4 to 6 grains per gallon, pH of 6.5 to 8.0 and chlorides less than 30 PPM. Water condition outside of these requirements may void the warranty. Please consult your local water comp ...

  • Hobart ML-132178 - page 10

    – 10 – ELECTRICAL CONNECTIONS WARNING: ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE APPLICABLE PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL ELECTRICAL CODES. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. WARNING: APPLIANCES EQUIPPED WITH A FLEXIBLE ELECTRIC SUPPLY COR ...

  • Hobart ML-132178 - page 11

    – 11 – Control Circuit Connection (All Models) 1 . Remove the side service panel on the right side of the oven. 2 . Route the single-phase supply wires through the knockout provided in the rear of the oven to the control circuit terminal block. (See data plate for circuit amp requirements.) 3 . Connect the line and neutral wire to the appropria ...

  • Hobart ML-132178 - page 12

    – 12 – PREOPERATIONAL CHECK WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. Initial startup of the oven must be performed by an authorized Hobart Bakery Systems service representative. Electric Ovens 1 . Turn on the water and check for leaks. Shut the water off and repair any leaks before proceedi ...

  • Hobart ML-132178 - page 13

    – 13 – 16. Turn the power switch OFF and allow the oven to cool. The oven has been set at the factory to bake assorted products, such as breads, rolls, cookies and muffins. If the bake is uneven, or if there is a specialty operation, the shutters may need to be adjusted to achieve the desired results. Contact your authorized Hobart Bakery Syste ...

  • Hobart ML-132178 - page 14

    – 14 – 10. Set the temperature to 300°F (149°C). Observe the OVEN TEMP display to monitor and verify that the oven comes up to set temperature. NOTE: If the burners do not ignite, there may be air in the gas line that needs to be bled out. Turn the oven power switch OFF, and wait a minimum of 5 minutes before trying again. 11. Adjust manifold ...

  • Hobart ML-132178 - page 15

    – 15 – Rack Adjustment Rack adjustments should be made with a typical bake product load on it. Depending on the bake product load, some undertravel or overtravel of the rack position is normal. The components are located on top of the oven (Fig. 6). 1 . Position the rack so it is square with the oven doors. 2 . Loosen two screws and align the P ...

  • Hobart ML-132178 - page 16

    – 16 – OPERA TION WARNING: THE RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, SERVICING OR CLEANING THE OVEN. ADVANCED CONTROLS ...

  • Hobart ML-132178 - page 17

    – 17 – Control Guide - Advanced Button Action Display POWER Press to turn the oven Control panel displays are lit when the oven is on. Oven ON or OFF. 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 Press to enter current time The AUTO ON/OFF TIMER w ...

  • Hobart ML-132178 - page 18

    – 18 – Control Guide - Advanced (cont) Button Action Display Press to stop the BAKE The ON light is off when the BAKE TIMER is inactive. TIMER or silence the beeper after the BAKE TIMER has timed out. PROGRAM Press the The PROGRAM window displays the number of the arrow keys to select current program. a bake program. STEP Use to enter bake prog ...

  • Hobart ML-132178 - page 19

    – 19 – 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 O N. 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 ...

  • Hobart ML-132178 - page 20

    – 20 – 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 a ...

  • Hobart ML-132178 - page 21

    – 21 – 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 ...

  • Hobart ML-132178 - page 22

    – 22 – 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 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 shutdown ...

  • Hobart ML-132178 - page 23

    – 23 – 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) ...

  • Hobart ML-132178 - page 24

    – 24 – DIMENSIONS AND SERVICE CONNECTION DIAGRAM a t a D l a c i r t c e l E s t l o V0 2 10 4 2 - 8 0 2 z t r e H0 60 6 s p m A6 19 e s a h P1 1 NOTE: The proofer must be wired separately from the oven. ...

  • Hobart ML-132178 - page 25

    – 25 – 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 ...

  • Hobart ML-132178 - page 26

    – 26 – MAINTENANCE WARNING: THE RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, SERVICING OR CLEANING THE OVEN. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE 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 obst ...

  • Hobart ML-132178 - page 27

    – 27 – TR OUBLESHOO TING 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 . Turn th ...

  • Hobart ML-132178 - page 28

    – 28 – PREVENTIVE MAINTENANCE PROCEDURE Inspect Oven Lamps 1 . Lamps should be on when oven is powered. 2 . If not, replace lamps. A. Unscrew lamp cover (Fig. 8) to disengage from lamp sockets and remove from socket. 3 . Reverse procedure to install new lamps. Fig. 8 Clean and Vacuum Components and Burner Area 1 . Clean the burner chamber (Fig. ...

  • Hobart ML-132178 - page 29

    – 29 – Inspect Rack Lift and 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. 12). B. Lift cover from top of oven. C. Observe condition of the rack rotation belt. ...

  • Hobart ML-132178 - page 30

    – 30 – Inspect Cavity Vent 1 . Check cavity vent for proper operation. A. Push VENT button (Fig. 14) on control panel to open vent and push again to close vent. B. Visually check that vent opens (Fig. 15) and closes (Fig. 16) when button is pushed. If vent does not operate, contact your local Hobart Bakery Systems service office. Fig. 14 Fig. 1 ...

  • Hobart ML-132178 - page 31

    – 31 – 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 compa ...

  • Hobart ML-132178 - page 32

    – 32 – 2 . Verify operation of combustion blower 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. Disconnect vacuum switch lead wires (Fig. 18). D. Loosen hose clamp (Fig. 18) and remove vacuum tube from the vacuum switch. NOTE: Some ovens ...

  • Hobart ML-132178 - page 33

    – 33 – 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 serv ...

  • Hobart ML-132178 - page 34

    – 34 – D E D E E N S A Y P O C S R E B M U N L A I R E S / L E D O M R E N W O D E D N E M M O C E R T S I L K C E H C E C N A N E T N I A M E V I T N E V E R P S A G - S N E V O K C A R Y R E K A B . N A E L C R O N O I T A R E P O R E P O R P R O F K C E H C Y R A S S E C E N S A E C I V R E S R O F L L A C s p m a l n e v o t c e p s n I s a ...

  • Hobart ML-132178 - page 35

    NO TES – 35 – ...

  • Hobart ML-132178 - page 36

    NO TES – 36 – FORM 34576 Rev. B (Nov. 2003) PRINTED IN U.S.A. ...

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