Lang LRO-2G Service Manual

Installation, Operation, Maintenance, & Troubleshooting

Model: LRO-2G,

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.

Model #: Purchased From:

Serial #:

Date Purchased:

Purchase Order #:

Location:

Date Installed:

For Service, Call:

ETL File 3028821 2 Rev. #A2002

CHAPTER PAGE

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

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

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

4. INSTALLATION INSTRUCTIONS ............................................................. 10

5. EMERGENCY OPERATION ....................................................................... 17

6. GENERAL OPERATION.............................................................................. 18

7. PROGRAMMING.......................................................................................... 20

8. GENERAL MAINTENANCE ....................................................................... 24

9. SAFETY CONSIDERATIONS ..................................................................... 27

10. ILLUSTRATED PARTS BREAKDOWN..................................................... 28

11. WIRING DIAGRAMS................................................................................... 37

12. WARRANTY................................................................................................. 39

ETL File 3028821 3 Rev. #A2002

WARNING THE WATER FROM THE STEAM DRAIN OUTLET IS EXTREMELY

HOT AND MAY CAUSE SERIOUS BURNS.

NOTICE Left rear drain point is provided and should be routed to a floor

drain. A 1” gap must be provided between oven drain and floor drain.

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

WARNING

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.

WARNINGS

PG. 8

PG. 10

CAUTION

CAUTION THIS APPLIANCE, WHEN INSTALLED, MUST BE ELECTRICALLY

CAUTION FOR INSTALLATION IN CANADA THE INSTALLATION MUST BE

WARNING

INSTALLATION MUST CONFORM WITH LOCAL CODES, OR IN THE ABSENCE OF LOCAL CODES WITH THE NATIONAL FUEL GAS CODE, ANSIZ223.11996.

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

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.

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.

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.

PG. 10

PG. 11

NOTICE Always ensure the grease filters supplied with the oven are

used. Replacement filters may be obtained from a Lang representative.

NOTICE It is imperative that a mechanical exhauster is installed, and a

pressure sensitive switch is installed at the collar of the hood. If a negative draw of 0.4” for LRO-2G or 0.6” W.C. is not achieved, the burner will not come on.

ETL File 3028821 4 Rev. #A2002

PG. 14

WARNINGS CONT’D

NOTICE No other exhaust systems may be connected to this system. Do

not try to vent or exhaust another appliance into this hood.

NOTICE

WARNING

NOTICE

WARNING

Do not allow more than 14 inches pressure to be applied to the gas valve at any time.

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.

IF BURNER DOES NOT LIGHT, TURN OFF POWER SWITCH, MANUAL GAS SHUT-OFF VALVE AND BURNER GAS SHUT-OFF VALVE. WAIT A MINIMUM OF 5 MINUTES, AND THEN REPEAT STEP 1 ABOVE. BURNER SHOULD NOW START. IF NOT, CALL FOR SERVICE.

PG. 14

PG. 16

PG. 17

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

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

NOTICE The steam, vent and fan functions cannot be used together in

NOTICE

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.

heating. Simply set the desired temperature and close the door.

the same step. 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.

PG. 17

PG. 20

PG. 23

ETL File 3028821 5 Rev. #A2002

NOTICE

WARNINGS CONT’D

To maintain optimum safety and performance for LANG Rack oven models LRO-1G & LRO-2G, 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.

PG. 23

NOTICE

WARNING

NOTICE

CAUTION

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.

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).

IF BLOWER ROTATION IS INCORRECT, IT WILL CAUSE SEVERE DAMAGE TO HEAT EXCHANGER

PG. 23

PG. 24

ETL File 3028821 6 Rev. #A2002

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 72” (1829 mm) wide x 105” (2667 mm) high x 62” (1575 mm) Deep. The Top, front, Back and Sides are constructed of stainless steel with 5 inches of insulation.

The oven in designed for 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.

The externally mounted florescent light provides excellent product visibility.

Interior Construction:

The oven cavity dimensions are 52” (1320 mm) wide x 75” (1905 mm) high x 52” (1320 mm) deep. The interior is constructed of stainless steel.

The rack carrier facilitates smooth and simple rack loading and unloading.

The rack lifter provides gentle rack lift and rotation, protecting delicate products.

The built-in steam generator generates steam quickly.

Oven air circulation is fully adjustable, providing even cooking.

Controls:

The large digital display is easy to understand and operate.

Pre-Programmable product selections simplify operation.

Step function allows for special menus.

Automated control functions include temperature, time, steam, vent, and fan delay.

Technical:

The oven requires a 120-volt single-phase power supply and a 208/240-volt three-phase power supply.

The oven requires a 3/4” NPT connection for gas.

The oven requires a 3/4” NPT connection for water.

The oven requires no clearance from combustible wall construction.

The oven can be heated by natural gas or propane at a heating rate of 290,00 BTU. The gas must be specified when ordering.

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 left rear corner of the oven.

NOTICE

Left rear drain point is provided, route it to a floor drain. A 1” gap must be provided between oven drain and floor drain.

ETL File 3028821 7 Rev. #A2002

EQUIPMENT DESCRIPTION CONT’D

Floor Drain

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

Rack Carrier

The rack carrier attaches to the top of the oven rack.

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

Rack Stop

The two rack stops are located be 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 exhausts are discharged into the hood. Grease is channeled to and collected in a grease cup for later removal.

Hood Exhaust

Cooking fumes and burner exhaust pass through a duct to the hood exhaust outlet. A customer-supplied exhaust blower is required. The hood can 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.

120V Circuit Breakers

Power to run the control panel and hood blower can be disconnected at these points. Switch to “OFF”, when servicing oven or blower.

WARNING WIRES ENTERING THE DISCONNECT MAY STILL BE LIVE EVEN

Manual Gas Shutoff

Gas is supplied to the oven through this valve. This valve is typically left open, but needs to be closed when servicing the oven. To close the valve, turn its handle to a horizontal position.

3-Phase Circuit Breaker

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

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

ETL File 3028821 8 Rev. #A2002

Circulation Blower

EQUIPMENT DESCRIPTION CONT’D

Vent Blower Oven Controls

ETL File 3028821 9 Rev. #A2002

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 must 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 oven needs air to operate. The hood exhaust will need at least 600-800 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 (46.0”) 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 two main pieces, not including hood.

Move the large oven crates 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

CAUTION THIS APPLIANCE, WHEN INSTALLED, MUST BE ELECTRICALLY

ETL File 3028821 10 Rev. #A2002

INSTALLATION MUST CONFORM WITH LOCAL CODES, OR IN THE ABSENCE OF LOCAL CODES WITH THE NATIONAL FUEL GAS CODE, ANSIZ223.11996.

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

INSTALLATION CONT’D

CAUTION FOR INSTALLATION IN CANADA THE INSTALLATION MUST BE

WARNING

Raising:

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

• Raise one end of each oven skid with a forklift until the oven is at 60° from horizontal. (If a forklift is not available, use a pallet jack and successive stacks of pallets to raise the oven. DO NOT LIFT THE OVEN BY HAND). Tilt the oven to the vertical position by hand from the raise position.

• Ease the oven to the floor and do not allow it to fall over. OVEN HALVES ARE UNSTABLE.

Assembly

Note: Nudge the halves with pry bars to move them. Do not force parts to fit.

• Move the erected oven halves to where the mating faces are 2-3 feet apart.

• Place the oven floor on the ground against the right wall of the oven and 6 inches forward of the rear

wall.

• Carefully raise the front edge of the right wall with a pry bar and slide the floor back until it touches the back wall.

• Slide the right half of the oven toward the left half until the two mate together.

• Bolt the inner skin together at the rear, top and front header using 5/16-18 gimlet point screws

provided.

• Install ½-13x1 hex head bolts, nuts, and lock washers at the joint in the rear base, rear top frame and header. Snug all bolts tight.

• Install the insulation provided at the center joint so that there are three layers and no voids.

• Slide the rear joint panel into the upper frame at the back of the oven and drop it into the lower

frame to close the back of the oven.

• Place the top insulation cover in place and secure it to the outer ceiling panel with the drill tip screws provided.

• Raise the front header cover into position between the front jambs and slip it over the header frame until it is flush with the front. Install two drill-tip screws through the top flange of the header cover. Install #10x¾ stainless steel sheet metal screws through the bottom flange of the header cover. Use care to keep the gasket in place.

• Install ¼-20x½” truss head stainless steel screws through the inner ceiling joint, inside the oven.

• Place the floor clamp strips around the inside walls of the oven. Install, using ¼-20x½” truss head

screws, washers and lock-washers, longer screws are provided for the overlapping joints at the corners. Do not tighten these screws until the oven has been placed at its final location and leveled.

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

ETL File 3028821 11 Rev. #A2002

INSTALLATION CONT’D

Assembly Cont’d

Note: Lifter installation is not required on some ovens

• Place the lifter assembly on top to the oven without the rotator assembly. Center the lifter over the rotator shaft housing with the lift motor to the rear of the oven.

• Install the rotator assembly through the lifter using care to locate the spring-steel clip between the elevation micro-switches.

• Move the lifter assembly around until the rotator assembly is clear of the lifter frame and all moving parts are free (this should be where the lifter is centered on the rotator shaft). Anchor the lifter assembly in place with the fasteners provided.

• Remove the snap ring, square washer and shipping spacer from the rotator shaft.

• Remove the rack carrier from the bottom of the hood crate. Install the carrier on the rotator shaft

inside the oven using the snap ring provided. Install the four set-screws in the carrier-shaft collar. Do not tighten yet, as this will allow the carrier to be aligned later.

• Install the end of the flex conduit from the blower motor into the lift frame.

• Uncoil the hi-limit switch from the hi-limit protector bracket and install in the side of the lifter frame

with the screws provided.

• Install the door micro-switch, (shipped wired to the lifter frame) at the door switch actuator bracket above the loading door. Adjust the switch for 1/8” over travel. Adjust the switch actuator for maximum travel.

• Connect the wires (34, 35 and 36) from the blower motor to the same wires in the lifter frame.

• Connect the wires (48 and 49) to the terminal at the high-limit switch.

• Connect the white plastic connector from the main harness to the white plastic connector on the

lifter harness.

• Check the location of all of the wires to ensure that they are free of sharp edges or moving parts.

• Install the transport wheel on the left jambs by raising the oven with the left front jackscrew, located

behind the control door, use the ¼-20 hex head bolts provided.

• Extend the transport wheel by adjusting the leveling jack screws in the rear.

ETL File 3028821 12 Rev. #A2002

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