Hobart DRO2GH, DRO2G User Manual

GAS RACK OVENS WITH ELECTRONIC OVEN CONTROL

MODELS

DRO2G GAS

DRO2GH GAS

701 S. RIDGE AVENUE

TROY, OHIO 45374-0001

937-332-3000

www.hobartcorp.com

FORM 19202 Rev. D (Dec. 2003)

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 CAN BE OBTAINED FROM THE LOCAL GAS SUPPLIER.

IMPORTANT

IN THE EVENT A GAS ODOR IS DETECTED, SHUT DOWN UNITS AT MAIN SHUT-OFF VALVE AND CONTACT THE LOCAL GAS COMPANY OR GAS SUPPLIER FOR SERVICE.

FOR YOUR SAFETY

DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS OR LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.

WARNING

IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH. READ THE INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR SERVICING THIS EQUIPMENT.

IN THE EVENT OF A POWER FAILURE, DO NOT ATTEMPT TO OPERATE THIS DEVICE.

KEEP AREA AROUND OVEN CLEAR OF COMBUSTIBLES. DO NOT OBSTRUCT COMBUSTION AND VENTILATION OPENINGS ON THE OVEN.

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Table of Contents

GENERAL ............................................................................................................................................... 4

INSTALLATION ........................................................................................................................................ 4

OPERATION ............................................................................................................................................ 5

Before First use ............................................................................................................................ 5

Loading and Unloading ................................................................................................................. 6

Door Handle ................................................................................................................................. 7

Controls (Fig. 3) ............................................................................................................................ 7

Oven preheat.............................................................................................................................. 10

Program baking .......................................................................................................................... 10

Manual Baking ............................................................................................................................ 12

Control panel updates ................................................................................................................ 13

Oven vent Controls .................................................................................................................... 14

Oven Preset Values ................................................................................................................... 14

Cleaning ..................................................................................................................................... 14

MAINTENANCE .................................................................................................................................... 15

General....................................................................................................................................... 15

Lubrication .................................................................................................................................. 16

Service and Parts Information .................................................................................................... 16

Preventive Maintenance ............................................................................................................. 16

OWNER PREVENTIVE MAINTENANCE PROCEDURE .................................................................... 17

Introduction ................................................................................................................................. 17

Preventive Maintenance Procedures ......................................................................................... 17

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OPERATION and CARE of

MODELS DRO2G & DRO2GH GAS

RACK OVENS WITH ELECTRONIC OVEN CONTROL

PLEASE KEEP THIS MANUAL FOR FUTURE USE

GENERAL

Models DRO2G and DRO2GH Gas ovens accommodate roll-in racks. They are equipped with an electronic oven control for baking and/or steaming applications. A mechanism in the ceiling rotates the rack during baking.

Model DRO2G is rated at 318,000 BTU and model DRO2GH is rated at 375,000 BTU (natural or propane gas).

Hobart Rack Ovens are produced with quality workmanship and material. Proper installation, usage and maintenance of your Rack 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

Models DRO2G and DRO2GH must only be installed or moved by Hobart-trained service technicians.

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OPERATION

WARNING: THE RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING,

SERVICING OR CLEANING THE OVEN.

BEFORE FIRST USE

Before using the oven for the first time, it must be burned in to release any odors that might result from heating the new surfaces in the oven.

WARNING: DISCONNECT ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES.

1. Using a clean cloth moistened in warm, soapy water, wash the stainless steel interior of the oven.

2. Rinse with clean water and dry with a clean, dry cloth.

3. Start up:

1. Set the shutoff gas valve and burner gas valve to ON.

2. Turn on electrical supply.

3. Turn the power switch to the ON position.

4. Set desired temperature.

5. Confirm that loading door is closed.

6. Wait for rack oven to reach set temperature.

4. Operate the oven at 350°F (176°C) for 6 to 8 hours.

5. Complete shutdown:

1. Turn off gas supply by setting shutoff gas valve and burner gas valve to OFF.

2. Turn off electrical supply.

3. Turn the power switch to the OFF position.

4. Before restarting oven, burner gas valve, shutoff gas valve and power switches must be off for a minimum of 5 minutes.

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LOADING AND UNLOADING

WARNING: THE OVEN AND ITS PARTS ARE HOT. TO PREVENT BURNS, USE HOT PADS OR

PROTECTIVE MITTS WHEN LOADING OR UNLOADING THE OVEN.

Double Rack

1. Roll the rack into the oven so the End Brackets channel onto the Rack Lifting Device (Fig. 1).

2. Close and latch the door. (See Operation.)

3. When baking is completed, the buzzer will sound. Press TIMER STOP.

4. Wait until the rack stops rotating. Open the door; the rack is lowered to the floor.

Single Rack

1. Roll the first rack into the oven so the Side Brackets channel onto the Rack Lifting Device (Fig.1). Close the door and press JOG. The rack turns around to the next load-unload position, then stops.

2. Open the door and roll the second rack into the oven so the Side Brackets channel onto the Rack Lifting Device (Fig.1).

3. Close and latch the door. (See Operation.)

4. When baking is completed, the buzzer will sound. Press TIMER STOP.

5. Wait until the racks stop rotating. Open the door; the racks are lowered to the floor.

NOTE: On newer models the Rack Lifting Device is equipped with a stop on both ends. Manually flip the stop open to slide the rack(s) off.

Fig. 1

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DOOR HANDLE

When the door is closed, make sure the door handle is in the fully vertical position (Fig. 2).

Fig. 2

CONTROLS (Fig. 3)

All of the oven’s baking processes are controlled here. Whether you bake in manual baking mode or program a baking process and recall it from memory, the same parameters must be defined for any baking operation.

Fig. 3

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OVEN TEMPERATURE - Indicates the current oven temperature in Fahrenheit or Celsius.

HEAT ON - Indicates the heat is on when lit.

SET TEMPERATURE - Displays the set baking temperature.

SET TEMPERATURE UP and DOWN - Press to adjust the temperature to the desired setting. The

temperature cannot be set higher than 550°F (288°C).

BAKE - Press to power up the oven for baking. The BAKE light and all temperature and time displays come on. Oven comes up to set baking temperature.

OFF - Press to turn the oven systems off. The control display turns off. Rack rotation stops immediately if running. The stack fan (in the exhaust system) will stay on for 20 minutes after the control is turned off.

FAN - Press to cool down the oven after use. The fan light and all temperature and time displays come on. Only the fan is operational. BAKE TIME and STEAM TIME are not operational.

JOG - Press to turn rack(s) around to the next load-unload position. Only operates when the door is closed. The rack rotation device rotates the rack(s) to the next load-unload position then stops to allow the operator to open the door.

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