Hobart DRO2GH manual

GAS RA CK O VENS WITH ELECTRONIC OVEN CONTROL MODELS DRO2G GAS DRO2GH GAS FORM 19202 Rev. D (Dec. 2003) 701 S. RIDGE AVENUE TROY, OHIO 45374-0001 937-332-3000 www.hobartcorp.com[...]

– 2 – © HOBART CORPORATION, 2001 IMPOR T 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 DETECT[...]

– 3 – T ab le of Contents GENERAL ............................................................................................................................................... 4 INST ALLA TION ........................................................................................................................................ 4 OPERA TION .[...]

– 4 – OPERA TION 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 duri[...]

– 5 – OPERA TION 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[...]

– 6 – 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 [...]

– 7 – 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 opera[...]

– 8 – 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 - Pres[...]

– 9 – BAKE TIME - Displays the baking time in minutes. BAKE TIME U P and DOWN arrows - Press to adjust the baking time in minutes. STEAM TIME - Displays the steam time in seconds. STEAM TIME UP and DOWN arrows - Press to adjust the steam time in seconds. TIMER START - Press to start the timer. The flashing light in the BAKE TIME display indicat[...]

– 10 – OVEN PREHEAT The oven will need to preheat to the desired baking temperature before baking begins. 1. Press BAKE. The BAKE light and all temperature and time displays come on. 2. The door must be closed to operate the oven fan and heat. The HEAT ON light is lit when the heat is on. 3. Adjust the SET TEMPERATURE to the desired setting by [...]

– 11 – Change a Program 1. Press the PROGRAM # UP arrow key until the desired program number is displayed. 2. The current settings are displayed. 3. Change only the settings that need to be changed. 4. Use the appropriate UP and DOWN arrow arrow keys to adjust the settings. 5. Press and hold ENTER key for 3 seconds until a beep is heard. 6. Cha[...]

– 12 – MANUAL BAKING Program # 0 is used for manual baking processes that are not assigned to memory. 1. Press the PROGRAM # UP arrow key to 0. If the PROGRAM # UP arrow key does not change the program number, press OFF and BAKE to reset and begin again. Program # 0 is factory preset as follows: • SET TEMPERATURE - 350°F (176°C). • BAKE T[...]

– 13 – CONTROL PANEL UPDATES WARNING : DISCONNECT ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. The DRO2 series ovens have different software configurations for the control panel depending on the date of manufacture. This is identified by a Control Version Number. The Control Version Number is indicated in the serial n[...]

– 14 – OVEN VENT CONTROLS When changing to a product which requires a lower baking temperature, the oven can be cooled down by exhausting heat from the oven using the Vent. To cool down the oven, open the Damper by pulling the knob outward (Fig. 4). Fig. 4 OVEN PRESET VALUES • The maximum SET TEMPERATURE is 550°F (288°C). • The SET TEMPER[...]

– 15 – MAINTENANCE WARNING : THE RACK OVEN AND ITS PARTS ARE HOT. USE CARE WHEN OPERATING, SERVICING, OR CLEANING THE OVEN. WARNING : DISCONNECT 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 obstr[...]

– 16 – LUBRICATION None required. SERVICE AND PARTS INFORMATION Contact your local authorized Hobart office for service . PREVENTIVE MAINTENANCE The DRO2 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 [...]

– 17 – O WNER PREVENTIVE MAINTENANCE PROCEDURE INTRODUCTION This owner 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 foun[...]

– 18 – Clean and Vacuum Components and Burner Areas 1. Clean the burner compartment (Fig. 6) area of dust and/or lint accumulation. 2. Vacuum the burner compartment (Fig. 6) floor of dust and/or lint accumulation. 3. Check and clean all air passageways (Figs. 7 & 8). A. Clear objects blocking all burner compartment air passageways. B. Clean[...]

– 19 – Inspect Door Components 1. Verify door switch operation (Fig. 9). A. Open door. B. While watching the door switch (at top of oven), close the door. C . The door switch should be operated. D . With the door open, the switch should be un-operated. 2. Check loading door latch bushings. A. Open door. B. Inspect door latch bushings for wear. [...]

– 20 – Inspect Cavity Vent 1. Check vent for proper operation. A. Pull vent handle (Fig. 11) out to open vent and push handle back in to close vent. B. Visually check that vent opens and closes when handle is moved. If vent does not open or close, contact your local authorized Hobart office for service. Fig. 11 Visually Inspect Electrical Conne[...]

– 21 – Verify Ignition Module Safety Lockout Functions - cont. 3. Reset control after safety lockout. A. With the control in a lockout condition, turn the main gas valve on. B. Reset the control by turning the oven control off and then back on. C . Ignition module should perform the 30 second purge and then burner should establish a flame. If f[...]

– 22 – Verify Ignition Module Safety Lockout Functions - cont. C . Verify that draft inducer motor stops running. D . Verify contactor 4 CON de-energized (Fig. 14). E. Verify burner shuts down. F. If burner shuts down, proceed to step H. G . If burner did not shut down, the draft inducer (stack fan) pressure switch malfunctioned; contact your l[...]

– 23 – Verify Ignition Module Safety Lockout Functions - cont. 6. Verify draft inducer motor operation. A. Turn the oven on. B. Visually inspect the convection motor for vibration while motor is running. C . If vibration is present, motor operation did not pass test; contact your local authorized Hobart office for service. D . If vibration is n[...]

– 24 – FORM 19202 Rev. D (Dec. 2003) PRINTED IN U.S.A. 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[...]