Lang LRO-2E Service Manual

Installation, Operation, Maintenance, & Troubleshooting

Model: LRO-2E-

Rack Oven

THIS MANUAL MUST BE RETAINED FOR FUTURE REFERENCE. READ, UNDERSTAND AND FOLLOW THE INSTRUCTIONS AND WARNINGS CONTAINED IN THIS MANUAL.

FOR YOUR SAFETY DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE. POST IN A PROMINENT LOCATION: INSTRUCTIONS TO BE FOLLOWED IN THE EVENT USER SMELLS GAS. THIS INFORMATION SHALL BE OBTAINED BY CONSULTING YOUR LOCAL GAS SUPPLIER. AS A MINIMUM, TURN OFF THE GAS AND CALL YOUR GAS COMPANY AND YOUR AUTHORIZED SERVICE AGENT. EVACUATE ALL PERSONNEL FROM THE AREA.

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.

DANGER POTENTIALLY HAZARDOUS SITUATION WHICH, IF NOT

AVOIDED, COULD RESULT IN DEATH.

WARNING POTENTIALLY HAZARDOUS SITUATION WHICH, IF NOT

AVOIDED, COULD RESULT IN DEATH OR SERIOUS INJURY.

CAUTION POTENTIALLY HAZARDOUS SITUATION WHICH, IF NOT

AVOIDED, MAY RESULT IN MINOR OR MODERATE INJURY.

NOTICE Helpful operation and installation instructions and tips are

present.

Model #: Purchased From:

Serial #:

Location:

Date Purchased:

Purchase Order #:

Date Installed:

For Service, Call:

ETL File 3028821 2 Rev. A 2002

CHAPTER PAGE

1. TABLE OF CONTENTS ............................................................................... 3

2. WARNING..................................................................................................... 4

3. EQUIPMENT DESCRIPTION...................................................................... 7

4. INSTALLATION INSTRUCTIONS ............................................................. 9

5. EMERGENCY OPERATION ....................................................................... 13

6. GENERAL OPERATION.............................................................................. 14

7. PROGRAMMING.......................................................................................... 16

8. GENERAL MAINTENANCE ....................................................................... 20

9. SAFETY CONSIDERATIONS ..................................................................... 23

10. ILLUSTRATED PARTS BREAKDOWN..................................................... 24

11. WIRING DIAGRAMS................................................................................... 33

12. WARRANTY................................................................................................. 35

ETL File 3028821 3 Rev. A 2002

WARNINGS

WARNING THE WATER FROM THE STEAM DRAIN OUTLET IS EXTREMELY HOT AND MAY

CAUSE SERIOUS BURNS.

NOTICE

WARNING WIRES ENTERING THE DISCONNECT MAY STILL BE LIVE EVEN WHEN THE

WARNING

CAUTION THIS APPLIANCE, WHEN INSTALLED, MUST BE ELECTRICALLY GROUNDED IN

CAUTION FOR INSTALLATION IN CANADA THE INSTALLATION MUST BE IN

WARNING

Left rear drain point is provided. Remove the plug from the location required and route to a floor drain. A 1” gap must be provided between oven drain and floor drain.

SWITCH IS TURNED OFF. SWITCH THE MAIN BREAKER AT THE WALL TO “OFF” WHEN SERVICING THE OVEN

TO REDUCE THE RISK OF FIRE, THE APPLIANCE IS TO BE MOUNTED ON FLOORS OF NON-COMBUSTIBLE CONSTRUCTION. SUCH CONSTRUCTION SHALL EXTEND A MINIMUM OF 12-INCHES BEYOND THE EQUIPMENT ON ALL SIDES.

ACCORDANCE WITH LOCAL CODES, OR IN THE ABSENCE OF LOCAL CODES, WITH THE NATIONAL ELECTRICAL CODE, ANSI/NFPA 70-1996.

ACCORDANCE WITH CAN/CGA-B149.1&2 OF THE INSTALLATION CODE, AND LOCAL CODES WHERE APPLICABLE. ALL ELECTRIC WIRING MUST BE IN ACCORDANCE WITH THE CURRENT CANADIAN ELECTRICAL CODE, C22.1 PART 1. GROUNDING THIS APPLIANCE MUST CONFORM TO CANADIAN ELECTRICAL CODE, CSA C22.2.

INSTALLATION OF THE UNIT MUST BE DONE BY PERSONNEL QUALIFIED TO WORK WITH ELECTRICITY AND PLUMBING IMPROPER INSTALLATION CAN CAUSE INJURY TO PERSONNEL AND /OR DAMAGE TO EQUIPMENT. UNIT MUST BE INSTALLED N ACCORDANCE WITH ALL APPLICABLE CODES.

WARNING

NOTICE Always ensure the grease filters supplied with the oven are used. Replacement

NOTICE No other exhaust systems may be connected to this system. Do not try to vent

WARNING

NOTICE

DO NOT ALLOW ANY PART OF YOUR BODY TO BE UNDER THE OVEN DURING THE LIFTING PROCESS. KEEP EVERYONE CLEAR FORM THE OVEN IF IT SHOULD FALL.

filters may be obtained from a Lang representative.

or exhaust another appliance into this hood.

WHEN REMOVING THE RACK OR PRODUCT FROM THE RACK WHERE OVEN MITTS TO AVOID SERIOUS BURNS.

DO NOT UNLOAD THE RACK FROM THE OVEN WHILE THE CARRIER IS IN THE LIFT POSITION. LOADED RACKS CAN BE EXTREMELY HEAVY.

DO NOT REMOVE A FLAMING PRODUCT FROM THE OVEN. SEVERE BURNS AND PROPERTY DAMAGE CAN RESULT.

THIS LANG OVEN PRODUCES HUMIDITY THAT CAN CAUSE THE INTERIOR FLOORING AND ADJACENT EXTERIOR FLOORING TO BECOME SLIPPERY. USE EXTREME CAUTION WHEN WALKING ON A WET OR DAMP FLOOR.

The temperature outside the oven should not exceed 104° F (40° C). This includes the temperature of the air above and around the oven.

ETL File 3028821 4 Rev. A 2002

WARNINGS CONT’D

NOTICE During the first few hours of operation you may notice a small amount of smoke

coming off of the oven, and a faint odor from the smoke. This is normal for a new oven and will disappear after the first few hours of use.

WARNING

WHEN THE LOADING DOOR IS OPENED, HOT AIR AND STEAM ARE RELEASED FROM THE OVEN INTERIOR. TO AVOID BURNS OPEN DOOR SLOWLY AND KEEP YOUR FACE AND HANDS CLEAR OF THE OPENING. ALL INTERIOR SURFACES ARE VERY HOT. DO NOT TOUCH ANYTHING WITHOUT OVEN MITTS.

WARNING

NOTICE It is not necessary to press the start button for the oven to begin heating.

NOTICE The steam, vent and fan functions cannot be used together in the same step.

NOTICE

WARNING

WIRES FROM THE SERVICE ENTRANCE MAY STILL BE LIVE, EVEN WHEN SWITCHES ARE TURNED OFF. TURN POWER OFF AT MAIN BREAKER BEFORE SERVICING.

Simply set the desired temperature and close the door.

These examples are given for training purposes only. Actual settings will vary based on product and preferences.

Service on this, or any other, LANG appliance must be performed by qualified personnel only. Consult your authorized service station directory or call the factory at 1-800-224-LANG (5264) or WWW. LANGWORLD.COM for the service station nearest you.

To maintain optimum safety and performance for LANG Rack oven models LRO1E & LRO-2E, it is recommended that a program of scheduled periodic maintenance be implemented. It’s sole responsibility of the user to establish, schedule and enforce such a program. Although the actual service interval will vary depending on the environment in which the equipment is operating, it is recommended the following be done by a LANG authorized service agency at least every 6 months.

For periodic maintenance and repairs, electrical diagrams are included in this manual and with the oven (on the back of the control door).

SINCE RESETS FOR THE CIRCULATION BLOWER MOTOR AND THE LIFTER MOTOR / ROTATOR MOTOR ARE AUTOMATIC, ALL POWER TO THE OVEN MUST BE TURNED OFF BEFORE SERVICING.

NOTICE

If shutter settings are to be adjusted differently than the recommended factory settings, the best results will be obtained if you (A) start with the factory settings, (B) close shutters to lighten a product in a given area- do not open shutters to darken a product, (C) do not move a shutter more than 1/32” or 1mm (see step gauge) illustration at any one time, (D) be sure all settings for left hand shutters match those for right hand shutters, and (E) do not adjust more than two shutters per side per time (four shutters total).

ETL File 3028821 5 Rev. A 2002

NOTICE

WARNINGS CONT’D

Air wing adjustment screw pairs must be tightened/loosened at the same time to adjust the angle of the air wing. In other words, one screw of the pair must be tightened as the other screw is loosened. Air wings can be adjusted singly or together to modify a side-to-center bake. Be advised that adjusting air wings affect the entire rack from top to bottom. For this reason, the angle of air wings should never be changed more then 1 degree at a time. Use the “Air Wing Adjustment Diagram” in the Appendix section of this manual as a guide when making adjustments. When desired angle is obtained, check all adjustment screws – They all must be tight!

ETL File 3028821 6 Rev. A 2002

EQUIPMENT DESCRIPTION

Data Plate

On this plate you will find the oven model, serial number, electrical ratings, BTU’s, gas type, and clearance specification.

Exterior Construction:

The oven exterior dimensions are 55” (139.7 cm) wide x 105” (266.7 cm) high x 51” (129.5 cm) Deep. The Top, front, Back, and Sides are constructed of stainless steel with 5 inches of insulation.

Floor level loading.

Type I or Type II hood with single point exhaust connection complying with Uniform Mechanical Code and NFPA 96.

The oven door is constructed of stainless steel with a full height single pain window and an interior releasing mechanism.

Externally mounted florescent light.

Interior Construction:

The oven cavity dimensions are 36.5” (92.71 cm) wide x 75” (190.5 cm) high x 39” (99.06 cm) deep. The interior is constructed of stainless steel.

Smooth and simple rack loading and unloading.

Gentle rack lift and rotation protects delicate products.

The rack is designed to hold up to twenty 18”x 26” sheet pans.

A built in steam generator generates steam quickly.

Fully adjustable airflow for even cook.

Controls:

Large digital display, which is easy to understand and operate.

Icon-driven (touch) panel allows for easy operation.

Pre-Programmable Product Selections.

Heat Loss Compensation for Consistent baking.

Technical:

The oven requires a 208/240 three-phase power supply and a 115 single-phase power supply for controls.

The oven requires no clearance from combustible wall construction.

WARNING THE WATER FROM THE STEAM DRAIN OUTLET IS EXTREMELY

HOT AND MAY CAUSE SERIOUS BURNS.

Steam Drain Outlet

Water exits the steam generating system through this outlet It is located at the lower right-hand jamb or left rear corner of the oven.

NOTICE

Left rear drain point is provided. Remove the plug from the location required and route to a floor drain. A 1” gap must be provided between oven drain and floor drain.

ETL File 3028821 7 Rev. A 2002

EQUIPMENT DESCRIPTION CONT’D

Floor Drain

This drain (customer supplied) receives the excess water from the steam generating system.

Rack Carrier

When the loading door is closed, the rack carrier lifts and rotates the oven rack.

Rack Stop

The two rack stops are located on the carrier and secure the oven rack in place during baking. The leading edge of the forward stop must manually flipped down to unload the oven rack. The stop will automatically return to the up (loading) position when the rack is removed.

Hood

Steam and burner exhaust is discharged into the hood. Grease is channeled to and collected in a grease cup for later removal.

Hood Exhaust

Exhaust passes through a duct to the hood exhaust outlet. A customer-supplied exhaust blower is recommended that the hood be wired to the external device terminals in the service box. This insures the hood is on whenever the oven is on. The “POWER” switch on the oven control panel activates the blower. The blower must be running before the oven will operate. A factory installed airflow switch disables heat until airflow exists.

Interior Door Release

This door release allows the door to be opened from inside the oven.

WARNING WIRES ENTERING THE DISCONNECT MAY STILL BE LIVE EVEN

WHEN THE SWITCH IS TURNED OFF. SWITCH THE MAIN BREAKER AT THE WALL TO “OFF” WHEN SERVICING THE OVEN

3-Phase Circuit Breaker

This disconnect provides short circuit protection for the circulation blower motor. Switch to “ OFF” when servicing the oven.

Element Circuit Breakers

There are 9 single phase circuit breakers to provided short circuit protection for the elements.

Main Power Connection

A 4-pole terminal block located in the lower control panel for the incoming power connection.

Control Connection

A 2-pole terminal block and 1-pole circuit breaker is located above the controls for power hook up for the controls.

Hood Supply

A 1-pole circuit breaker is provided to supply power to the ventilator hood.

ETL File 3028821 8 Rev. A 2002

INSTALLATION INSTRUCTIONS

WARNING

Receiving the Oven

Upon receipt, check for freight damage, both visible and concealed. Visible damage should be noted on the freight bill at the time of delivery and signed by the carrier's agent. Concealed loss or damage means loss or damage, which does not become apparent until the merchandise has been unpacked. If concealed loss or damage is discovered upon unpacking, make a written request for inspection by the carrier's agent within 15 days of delivery. All packing material should be kept for inspection. Do not return damaged merchandise to Lang Manufacturing Company. File your claim with the carrier.

Pre-Installation

Check the area where the oven is to be installed for the following:

• No electrical conduit or wires are to be under the floor of the oven.

• The oven must be mounted on a non-combustible surface. This includes the structure beneath the

floor.

• Ceiling height above the oven should be sufficient to allow servicing the lifter, vent and blower motor assemblies. The maximum height needed for tilting the oven up is 105 inches.

• Clear access is needed to the roof or exterior of the facility for hood exhaust. Check local codes for correct venting.

• Access is needed for an air-gap drain in the rear left corner of the oven.

• Adequate space is needed in front of the oven to load and unload racks. Racks are hot and need

space to cool.

• The hood exhaust will need at least 600 CFM of make-up air.

• Local and national codes will require an electrical shut-off within a reasonable distance to the oven.

• Local and National codes will require access to a manual Gas Shut-off.

• The door swing will need to be clear to allow adequate loading and unloading of the oven. Check

the space next to the oven and be sure it does not interfere with the door.

Un-Crating

TO REDUCE THE RISK OF FIRE, THE APPLIANCE IS TO BE MOUNTED ON FLOORS OF NON-COMBUSTIBLE CONSTRUCTION. SUCH CONSTRUCTION SHALL EXTEND A MINIMUM OF 12-INCHES BEYOND THE EQUIPMENT ON ALL SIDES.

The oven is shipped in one piece. (It can be uncrated and split into two for easy installation where door openings are limited to 36 inches.)

Move the large oven crate into the room, near where it is to be installed. Allow clear access for a forklift or lifting apparatus at the top end of the oven. The bottom end of the oven crate is beveled at the skids.

Check the crate for damage that may have occurred in shipping.

Remove crating materials and plastic wrap from the oven. Remove the heat exchanger vent duct from the skid.

CAUTION THIS APPLIANCE, WHEN INSTALLED, MUST BE ELECTRICALLY

GROUNDED IN ACCORDANCE WITH LOCAL CODES, OR IN THE ABSENCE OF LOCAL CODES, WITH THE NATIONAL ELECTRICAL CODE, ANSI/NFPA 70-1996.

ETL File 3028821 9 Rev. A 2002

INSTALLATION CONT’D

CAUTION FOR INSTALLATION IN CANADA THE INSTALLATION MUST BE

IN ACCORDANCE WITH CAN/CGA-B149.1&2 OF THE INSTALLATION CODE, AND LOCAL CODES WHERE APPLICABLE. ALL ELECTRIC WIRING MUST BE IN ACCORDANCE WITH THE CURRENT CANADIAN ELECTRICAL CODE, C22.1 PART 1. GROUNDING THIS APPLIANCE MUST CONFORM TO CANADIAN ELECTRICAL CODE, CSA C22.2.

WARNING

Raising:

Raise the oven to its vertical, upright position with the use of a forklift or other lifting device. Provide a means to lower the oven to the floor without dropping.

• Secure two 5,000 lb. lifting straps to the rear lifting eyes on top of the oven and to a point on the forklift 40 inches from the mast.

• Secure a third 5,000 lb. strap to the front lifting eye on top of the oven and to the carriage of the forklift. This strap should be situated so that it will prevent the oven from falling forward when it is near upright.

• Raise the forks and slowly move forward, keeping the lifting straps vertical. Slowly move forward until the oven is upright.

• Remove all straps and lifting equipment.

Raise the front of the oven with a pry bar and attach the front wheel assembly (located in the hood crate) to the left front door jamb using #¼-20 truss-head screws provided. Rotate the rear leveling adjusters clockwise until the rear wheels have extended and allow the rear of the oven to roll.

DO NOT ALLOW ANY PART OF YOUR BODY TO BE UNDER THE OVEN DURING THE LIFTING PROCESS. KEEP EVERYONE CLEAR FORM THE OVEN IF IT SHOULD FALL.

ETL File 3028821 10 Rev. A 2002

INSTALLATION CONT’D

Setting

Remove the vinyl protective coating from all of the exterior surfaces.

Roll the oven into its final installed position. (You may wish to install the hood before locating the oven.)

Adjust the left front leveling screw until the weight is removed from the wheel assembly. Remove the wheel assembly.

Adjust the rear leveling screws and the left front leveling screws until the left jamb is level from left to right and front to back. Lock the left front adjusting screw in place.

Close the loading door. Adjust the right front leveling screw until the gap at the top of the door opening is even all across. Check the gap along the left side of the door. Recheck the level of the oven.

Loosen the floor clamp screws around the perimeter of the oven floor.

Walk around the stainless floor until it is in full contact with the concrete floor. Retighten the floor clamp screws.

Drill the floor with a 3/8” diameter drill to accept the concrete floor anchors.

o Mark the drill bit at 1-1/2” from the end with tape. Drill until the mark is at the top of the stainless

steel floor. Do not drill too deep.

o Clean the holes of concrete dust.

o If the oven is mounted on stone or ceramic tile, extend the holes and the anchors into the concrete

substrate.

Install the anchors in the holes and set in place with the anchor-setting tool. (Note: One good solid blow is better than many little taps.)

Install the #¼-20 flat head screws in the anchors. Use the anchor washers at the holes in the middle of the floor at the larger anchor holes. Additional screws have been provided in the event that a hole is drilled too deep

Adjust the Loading door latch to ensure a good seal around the door. Do not over tighten the door.

Check the level of the rack carrier shaft. Place an accurate level on the top of the carrier and rotate the carrier to the four points of the compass. The level bubble should be in the same position relative to the carrier when rotated. If not, remove the carrier and level the shaft.

o Loosen the four corner screws on the rotator shaft level adjusting plate on the under side of the inner

ceiling. Remove the two remaining screws.

o Move the shaft manually until the shaft is level in all four directions.

o Retighten the four corner screws.

o Drill two new screw holes in the adjusting plate with a #7 drill bit and tap #¼-20. Install the two

remaining screws to lock the shaft level in place.

ETL File 3028821 11 Rev. A 2002

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