Hobart ML-132178, ML-132177 User Manual
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MODELS HO300G AND HO300E
MINI ROTATING RACK OVENS
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MODEL
HO300E (ELECTRIC) ML-132177
HO300G (GAS) ML-132178
701 S. RIDGE AVENUE
TROY, OHIO 45374-0001
937 332-3000
www.hobartcorp.com
FORM 34576 Rev. B (Nov. 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 SHUTOFF 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.
This manual has been prepared to provide information in accordance with
© HOBART CORPORATION, 2001
ANSI Z83.11-2000 for gas equipment.
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TABLE OF CONTENTS
GENERAL .............................................................................................................................................4
INSTALLATION ....................................................................................................................................4
Unpacking .......................................................................................................................................4
Location ...........................................................................................................................................5
Installation Codes and Standards ..................................................................................................5
Assembly.........................................................................................................................................6
Leveling ...........................................................................................................................................6
Gas Connections ............................................................................................................................7
Testing the Gas Supply System ....................................................................................................7
Ventilation ........................................................................................................................................8
Plumbing Connections ....................................................................................................................9
Drain Connections ..........................................................................................................................9
Electrical Connections................................................................................................................. 10
Preoperational Check .................................................................................................................. 12
OPERATION...................................................................................................................................... 16
Advanced Controls ...................................................................................................................... 16
Shutdown ...................................................................................................................................... 22
Cleaning ...................................................................................................................................... 22
ACCESSORIES - HPC800 PROOFING CABINET ........................................................................ 23
Plumbing connections.................................................................................................................. 23
Drain connections ........................................................................................................................ 23
Electrical Connections................................................................................................................. 23
Dimensions and Service Connection Diagram .......................................................................... 24
Controls ........................................................................................................................................ 25
MAINTENANCE................................................................................................................................. 26
General ......................................................................................................................................... 26
Service and Parts Information..................................................................................................... 26
TROUBLESHOOTING ...................................................................................................................... 27
Burners Will Not Light (Gas Ovens Only) .................................................................................. 27
Service and Parts Information..................................................................................................... 27
OWNER PREVENTIVE MAINTENANCE PROCEDURES............................................................ 27
Introduction ................................................................................................................................... 27
Preventive Maintenance Procedures.......................................................................................... 27
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INSTALLATION, 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. A mechanism in the ceiling
rotates the rack during baking.
Model HO300G is rated at 95,000 BTU/hr (natural or propane gas). Model HO300E is rated at 18.0 kW
(electric).
Hobart Mini Rotating Rack Ovens are produced with quality workmanship and material. Proper
installation, usage and maintenance of the rack oven will result in years of satisfactory performance.
It is suggested that you thoroughly read this manual and carefully follow the instructions provided.
INSTALLATION
Installation of the oven should be performed by an authorized service representative. Before installing,
verify that the electrical service and type of gas supply (natural or propane) agree with the specifications
on the data plate located behind the right-side service panel. If the supply and equipment requirements
do not agree, do not proceed with the installation. Contact Hobart Bakery Systems immediately.
UNPACKING
This oven was inspected before leaving the factory. The transportation company assumes full
responsibility for safe delivery upon acceptance of the shipment. Immediately after unpacking, check
for possible shipping damage. If the oven is found to be damaged, save the packaging material and
contact the carrier within 15 days of delivery.
Carefully unpack the oven and place in a work-accessible area as near to its final installed position as
possible. Remove protective covering from exterior surfaces prior to placing oven in final location.
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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 free and clear of combustible substances.
Do not obstruct the flow of combustion and ventilation air. Adequate clearance for air openings into the
combustion chamber must be provided. Make sure there is an adequate supply of air in the room to
replace air taken out by the ventilating system.
INSTALLATION CODES AND STANDARDS
The oven must be installed in accordance with:
In the United States of America:
1. State and local codes.
National Fuel Gas Code
2.
, ANSI-Z223.1 (latest edition). Copies may be obtained from The
American Gas Association, Inc., 1515 Wilson Blvd., Arlington, VA 22209.
National Electrical Code
3.
, ANSI/NFPA-70 (latest edition).
In Canada:
1. Local codes.
2. CAN/CGA-B149.1
3. CAN/CGA-B149.1
Natural Gas Installation Code
National Fuel Gas Code
(latest edition).
(latest edition), available from The Canadian Gas
Association, 178 Rexdale Blvd., Etobicoke, Ontario, Canada M9W 1R3.
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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 Accessories - HPC800 Proofing Cabinet for proofer specifications.)
Oven Mounted on a Stand or Proofer with Caster (Gas Ovens Only)
For an appliance equipped with casters, instructions that (1) the installation shall be made with a
connector that complies with the Standard for
or
Connectors for Moveable Gas Appliances, CAN/CGA-6.1
complies with the Standard for
Quick-Disconnect Devices for Use With Gas Fuel, ANSI Z21.41
Quick Disconnect Devices for Use with Gas Fuel, CAN1-6.9
Connectors for Movable Gas Appliances, ANSI Z21.69
6, and a quick-disconnect device that
, or
, (2) adequate means must be provided
to limit the movement of the appliance.
LEVELING
Once the oven is in its permanent position, place a carpenter’s level on the oven rack. If the oven is
installed on a stand with adjustable legs, turn the feet in or out to level oven front-to-back and side-toside. If the oven is installed on a caster-equipped HPC800 proofer base or stand, determine which
caster(s) needs to be adjusted. Confirm that locks are set on casters, then use wood or other solid
blocks to support equipment during adjustment so that it cannot roll or fall. Loosen the bolts securing
the caster(s) and insert the appropriate shim thickness material (supplied) between the caster plate and
the bottom of the stand. Retighten caster bolts and check leveling.
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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. Verify that the gas supply matches the type on the data plate located behind the right-side service
1
panel. If line pressure exceeds
/2 psig (3.45 kPa) 14" W.C. (water column), install a pressure
regulator before the oven’s gas valve.
a. The arrow on the pressure regulator shows the direction of the gas flow. The pressure
regulator must be mounted horizontally for proper preset outlet pressure. If the regulator is
installed in any other position, the outlet pressure must be reset for proper operation.
2. Codes require installation of a gas shutoff valve in the gas line ahead of the oven. The gas supply
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line must be at least the equivalent of
/4" iron pipe. Corrugated lines should not be used.
3. A manual gas shutoff valve is located behind a slide-up access door, located at the bottom of the
front control panel. Verify that the shutoff valve is in the OFF position before connecting the
incoming gas line to the oven.
3
4. Connect the gas supply line to the
/4" NPT incoming gas connection, located at the rear of the
oven. Make sure the pipes are clean and free of obstructions. If oven is supplied with a flexible
gas line, secure it to oven and wall per instructions in gas line package.
5. Verify that the line pressure before the gas valve stays between 5" and 14" W.C. for natural gas,
or 11" and 14" W.C. for propane gas - with and without the burner firing.
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.
TESTING THE GAS SUPPLY SYSTEM
1
When gas supply pressure exceeds
/2 psig (3.45 kPa), the oven and its individual shutoff valve must
be disconnected from the gas supply piping system.
1
When gas supply pressure is
/2 psig (3.45 kPa) or less, the oven should be isolated from the gas supply
system by closing its individual manual shutoff valve.
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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 located behind the right side service panel adjacent to the 120 V power
connection. Consult local codes for vent interlock requirements.
Indirect Vent (Under Exhaust Hood) - Standard
Locate the oven under an exhaust hood with adequate overhangs and exhaust rates to completely
capture the byproducts of combustion discharged from the flue. From the termination of the flue to the
filters of the hood venting system, a minimum clearance of 18" must be maintained. The hood exhaust
fan can be electrically interlocked with the oven.
Information on the construction and installation of ventilating hoods may be obtained from the standard
Vapor Removal from Cooking Equipment
for
Fire Protection Association
, Batterymarch Park, Quincy, MA 02269.
, NFPA No. 96 (latest edition), available from the
National
Direct Vent (Draft Hood) - Optional
1. Remove the four screws from the tabs that secure the flue-fan grille to the top of the oven and
remove the grille covering the fan and flue.
2. Bend the four exposed tabs verticaly and secure the draft diverter to the oven flue collar with the
four screws.
3. Move the oven into position and connect customer-supplied exhaust ducting to the draft diverter
(Fig. 1).
4. Verify that the air is being drawn into the bottom of the draft diverter while the burner is firing, using
a draft gauge or smoke test.
5. Using a draft gauge, verify that a draft between 0.03" and 0.11" W.C. is maintained at a point 6"
above the draft diverter’s upper collar. Any exhaust fan or draft inducer used to maintain system
suction must be operating when oven is turned on. (See External Fan Control Connection.)
Fig. 1
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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 company and/or water condition dealer before installing oven.
1
Connect the cold water supply to the
/2" NPT incoming water connection located at the rear of the oven,
with the 6-ft, flexible, clear, water line provided. Water supply should have a pressure of 30 to 75 psi
(207 to 517 kPa) when the steam solenoid is open.
DRAIN CONNECTIONS
1
Connect a
/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. Adequate drop must be provided such that the
oven drain will not flood the proofer cabinet.
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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 CORD ARE
PROVIDED WITH A THREE-PRONG GROUNDING PLUG. THIS PLUG MUST BE CONNECTED
INTO A PROPERLY GROUNDED THREE-PRONG RECEPTACLE. IF THE RECEPTACLE IS NOT
THE PROPER GROUNDING TYPE, CONTACT AN ELECTRICIAN. DO NOT REMOVE THE
GROUNDING PRONG FROM THIS PLUG.
The wiring diagram is located behind the side service panel on the right side of the oven.
Do not connect the HO300G gas model to the electrical supply until after gas connections have been
made.
The HO300E is an electrically heated oven consisting of six W-shaped elements, each rated at 3.0 kW
for a total input of 18.0 kW. The electrical input is shown in the table below:
Heating Circuit Supply Voltage
stloVzHesahPspmA
80206-05168
042-02206-05157-96
80206-05305
042-02206-05334-04
084-04406-05322-02
Both gas and electric ovens require a dedicated 15-amp, 110/120 V, 50 to 60 Hz, single-phase supply
with ground, connected at the control circuit terminal block located behind the right side service panel.
If oven is installed in conjunction with an HPC800 Proofing Cabinet, a separate 120 V supply is required
for the proofer.
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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 appropriately marked terminals.
4. Connect the ground wire to the green chassis ground screw located adjacent to the terminal block.
Heating Circuit Connection (Electric Ovens Only)
• Verify that the supply voltage to the oven, listed in the Heating Circuit Supply Voltage table,
matches the voltage listed on the data plate located behind the side service panel on the right
side of the oven.
• Route the supply wires through the knockout provided in the rear of the oven to the heating
circuit terminal block. (See data plate for circuit amp requirements.)
• Connect each wire to the appropriately marked terminals.
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