Lang EHS-PP-CE Service Manual

Installation, Operation, & Maintenance

Model: EHS-PP-CE,

Electric Full Size Convection Oven

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

DANGER

WARNING

CAUTION

NOTICE

POTENTIALLY HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, COULD RESULT IN DEATH.

POTENTIALLY HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, COULD RESULT IN DEATH OR SERIOUS INJURY.

POTENTIALLY HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, MAY RESULT IN MINOR OR MODERATE INJURY.

Helpful operation and installation instructions and tips are present.

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 #:

Location:

Date Purchased:

Purchase Order #:

Date Installed:

For Service, Call:

EQUIPMENT DESCRIPTION

Lang Model: Lang Model: EHS-PP-CE

Exterior Construction

The oven exterior dimensions are 30” (76.2 cm) Wide, 25.25” (74.3 cm) High, 26.5” (67.31 cm) Deep. The Top, Front, Back, and Sides are constructed of stainless steel with an aluminized bottom.

The oven door comes standard with a window and is easily reversible.

The door handle is constructed of Polycarbinate.

The oven cavity is insulated with high temperature insulation for efficiency and reduced heat loss.

Interior Construction

The oven cavity dimensions are 15” (38.1 cm) Wide, 20” (50.84 cm) High, 21” (53.38 cm) Deep.

The oven is designed for five shelves and comes with five Chrome Plated Racks.

The interior of the oven is constructed of stainless steel.

Operation

The EHS-PP-CE oven is a forced air convection oven with a vented oven cavity.

A 1/3 HP fan motor drives the air.

Controls

Complete computerized controls.

Pre-Programmable product selections.

Independent shelf timers for each shelf.

Load control through use of Cooking Curves.

Shelf compensation for uniform baking.

Solid-state temperature sensing and controls.

Dual speed fan.

Manual override controls.

Technical

Oven can be either 208 or 240-volt single phase or 380 or 415-volt three phase with a neutral, this must be specified when ordering.

Floor space required is 42” (106.68cm) Wide, 32.5” (82.55cm) Deep.

The oven weighs 225 lb. (102.5 Kilograms).

The ovens are stackable and can include stacking kit if requested.

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UNPACKING

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.

Location

Prior to un-crating, move the oven as near to its intended location as practical. The crating will help protect the unit from the physical damage normally associated with moving it through hallways and doorways.

Un-crating

The oven will arrive completely assembled inside a wood frame and strapped to a skid. Cut the straps and remove the wood frame.

CAUTION

EACH UNIT WEIGHS 225 LBS (102.23 KILOGRAMS). FOR SAFE HANDLING, INSTALLER SHOULD OBTAIN HELP AS NEEDED, OR EMPLOY APPROPRIATE MATERIALS HANDLING EQUIPMENT (SUCH AS A FORKLIFT, DOLLY, OR PALLET JACK) TO REMOVE THE UNIT FROM THE SKID AND MOVE IT TO THE PLACE OF INSTALLATION.

CAUTION

The oven may now be removed from its skid.

ANY STAND, COUNTER OR OTHER DEVICE ON WHICH OVEN WILL BE LOCATED MUST BE DESIGNED TO SUPPORT THE WEIGHT OF THE OVEN.

SHIPPING STRAPS ARE UNDER TENSION AND CAN SNAP BACK WHEN CUT.

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DANGER

INSTALLATION

THIS APPLIANCE MUST BE GROUNDED AT THE TERMINAL PROVIDED. FAILURE TO GROUND THE APPLIANCE COULD RESULT IN ELECTROCUTION AND DEATH.

WARNING

NOTICE

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 IN ACCORDANCE WITH ALL APPLICABLE CODES.

The data plate is located on the back of the oven above the power outlet. The oven voltage, wattage, serial number, wire size, and clearance specifications are on the data plate. This information should be carefully read and understood before proceeding with the installation.

The installation of any components such as a vent hood, grease extractors, fire extinguisher systems, must conform to their applicable National, State and locally recognized installation standards.

Leg Installation

Legs are available for single, double, and counter top installations. Single deck installations require a 28-inch leg, double deck installations require a 16-inch leg, and counter top installations require a 4-inch leg.

To install the 28-inch legs, place some cardboard on the floor and gently tip the oven onto its back. Fasten two legs to the oven's front. Lift the oven onto its front legs and block the back up using one of the 28-inch legs set upside down in the center rear of the oven body. Install the last 28-inch leg onto the oven body on the control side rear. Gently lift the oven rear, remove the leg set to support the oven center and install it on the last rear corner.

To install the 16-inch legs follow the same instructions as the 28-inch legs.

To install the 4-inch legs, place some cardboard on the floor and gently tip the oven onto its back. Fasten the four 4-inch legs into the threaded holes provided on the bottom of the convection oven. Gently lift the oven onto the legs.

Stacking the Ovens

Stacking kits must be requested upon purchase. Remove all the plug buttons from the top of the lower oven.

Remove the stacking kit from the oven compartment of one oven and install the 1 1/4-inch plastic bushing into the top of the lower oven.

Tip the top oven backwards and install two pins into the front leg holes of the top oven.

Lift the top oven and gently set on top of the lower oven so that the studs nest into the holes of the lower oven.

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INSTALLATION CONT’D

Reversing the door

1. Disconnect oven from power.

2. Remove the top and bottom door hinge covers (4) by removing the two 10-32 Phillip head screws (8).

3. Remove the top door hinge bracket (1) from the oven by removing the two ¼-20 Phillip head screws (7). The hinge should now slide off of the door pin (this will now be your right hand lower hinge)

4. Lift the door off of the bottom pin and set aside.

5. Remove the bottom door hinge bracket (2) by removing the two ¼-20 Phillip head screws (7) (this will now be your upper right hand hinge).

6. Remove the lower hinge mounting plate (9) by pulling it from behind the leg pad adapter on the bottom of the oven.

7. Remove the two Phillips head screws in the bottom right corner of the oven, where the new hinge will be placed.

8. Slide the hinge mounting plate (9) into place and mount the hinge bracket (this should be your old upper hinge) using two ¼-20 (7) Phillips head screws.

9. Remove the two Phillips head screws in the upper right corner of the oven where the new hinge will be placed.

10. Rotate the door 180° and slide the door pin into the bottom hinge bracket.

11. Slide the upper door hinge (1) onto the upper door pin and then screw into place using two ¼-20 Phillip head screws.

12. Place the top and bottom door hinge covers (4) back on the oven using two 10-32 Phillip head screws (8).

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Vent Cap Installation

Screw (2x)

Step one: Attach vent flange to oven top with screws

Vent Cover

INSTALLATION CONT’D

Vent Flange

Oven Top

Screw (2x)

Step two: Attach vent cover to vent flange with screws

Step three: Assembly is complete

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INSTALLATION CONT’D

Ventilation and Clearances

Standard minimum clearance from combustible construction is as follows.

4” from side 4” from back 6” from floor

These ovens may be set directly, without legs, on a curbed base or non-combustible floor.

If the oven is set without legs on a non-combustible floor or a curbed base, maintain a 4-inch back clearance.

If the oven is set directly against a non-combustible back wall, maintain a 6-inch clearance to the floor.

Do not install the oven closer than 4 inches from another oven on the right hand side (control panel side).

Do not install the oven closer than 12 inches from an uncontrolled heat source (char broiler etc.) on the right side.

Keep the appliance area free and clear of combustible material and do not obstruct the flow of combustion or ventilation air.

The installation of any components such as a vent hood, grease extractors, and/or fire extinguisher systems, must conform to the there applicable nationally recognized installation standards.

Electrical Connection

The electrical connection must be made in accordance with local codes or in the absence of local codes with NFPA No. 70 latest edition (in Canada use: CSA STD. C22.1).

The electrical service entrance is provided by a 1 1/4-inch knockout at the oven back directly behind the control compartment. A grounding lug is provided at the rear service entrance.

Circuit Protection should be made in accordance with local codes and regulations, however in the absence of local requirements, a 20-amp circuit protection is recommended.

Oven Voltage

The oven amp draw, KW rating, and phasing can be found in the wiring diagram section of this manual.

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INITIAL START UP

Pre-Power On

After the oven is installed and connected to power, prior to turning on, verify the following:

• The door opens and closes freely.

• All racks are in the oven correctly.

• All packing materials have been removed from the inside of the oven.

Power On

Once oven has been turned on verify that the blower wheel is spinning freely in a clockwise position and that the elements are heating properly.

NOTICE

During the first few hours of operation you may notice a small amount of smoke coming off 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.

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Control Panel

OPERATION

POWER

AlphaNumeric Display.

Product Select Button. Press to select desired product.

On

Off

1

2

3

6

7

8

A

B

C

Power switch.

Shelf Select Button. Press to select shelf which product will be placed.

4

5

Manual Program Button. Use when product being cooked is for one time only.

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Prog

9

0

13

D

E

Read Clear

Read/Clear Button. Used to read programs, clear programs, and to access program menu.

Typical Operation Sequence

ACTION RESULT

Turn power switch to ON. Control panel comes on, display says

Press a product button. Display says “PRODUCT X PREHEATING

Beeper sounds briefly. Display says “READY SELECT PRODUCT

OPERATION CONT’D

“SELECT PRODUCT OR READ/CLEAR TO PROGRAM.

TO XXX F”. Motor starts and oven begins

preheating to the programmed temperature.

TO START ”.

Open the oven doors and load the product. Close the door and press the product button again.

Press the shelf button(s) which correspond to the shelf positions, which the product is loaded (A equals the top shelf and E equals the bottom shelf).

Beeper sounds continuously. Display shows “DONE PRESS SHELF

Press the flashing shelf button(s). Beeper stops. Display shows “READY

Open oven door and remove the product, which corresponds to flashing shelf button(s).

Beeper sounds briefly and display says

“SELECT OVEN SHELVES PRODUCT X”.

Display shows a countdown timer and begins to count toward zero.

BUTTON X, REMOVE PRODUCT”, shelf button(s) flash.

SELECT PRODUCT TO START” if no other shelves carry product or resume count down for shelves that still have product cooking.

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OPERATION CONT’D

s

Hints & Suggestions

Convection ovens constantly circulate air over and around the product. This strips away the thin layer of moisture and cool air from around the product allowing heat to penetrate more quickly.

Cooking times can be shortened and cooking temperatures can be reduced.

To convert standard deck oven recipes, reduce the temperature 50 degrees and the time by 25%. Make minor adjustments as necessary.

The lower the oven temperature the more even the bake.

Always weigh your product. This will give you a more consistent size, color and quality.

Check the product near the end of the initial cooking cycle.

Do not open the oven doors during baking as this will change the baking characteristic of the oven and make it difficult to determine a final program.

If the product is overdone on the outside and underdone on the inside, reduce the baking temperature.

If the product is pulling away from the edge of the pan, the temperature is too high or the cooking time too long.

The convection is a mechanical piece of equipment. The same control settings will always give the same results. If the results vary, problems may be because of product preparation.

Loading

When loading and unloading the oven, stage products and racks so the oven doors are opened for the least amount of time.

Be sure that racks are level within the oven.

Bent or warped pans can greatly affect the evenness of the cook or bake.

If using baker’s parchment, be sure the parchment does not blow over the product. The will create a uneven bake.

Load each shelf evenly. Spaces should be maintained equally between the pan and oven walls, front and back.

Do not overload pan’s this will create a uneven bake.

For best baking results, load the oven from the center out during random loading.

CAUTION

ALWAYS KEEP THE AREA NEAR THE APPLIANCE FREE FROM COMBUSTIBLE MATERIALS.

KEEP FLOOR IN FRONT OF EQUIPMENT CLEAN AND DRY. IF SPILLS OCCUR, CLEAN IMMEDIATELY, TO AVOID THE DANGER OF SLIPS OR FALLS.

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WARNING

CAUTION

NOTICE

MAINTENANCE & CLEANING

KEEP WATER AND SOLUTIONS OUT OF CONTROLS. NEVER SPRAY OR HOSE CONTROL CONSOLE, ELECTRICAL CONNECTIONS, ETC.

MOST CLEANERS ARE HARMFUL TO THE SKIN, EYES, MUCOUS MEMBRANES AND CLOTHING. PRECAUTIONS SHOULD BE TAKEN TO WEAR RUBBER GLOVES, GOGGLES OR FACE SHIELD AND PROTECTIVE CLOTHING. CAREFULLY READ THE WARNING AND FOLLOW THE DIRECTIONS ON THE LABEL OF THE CLEANER TO BE USED.

Never leave a chlorine sanitizer in contact with stainless steel surfaces longer than 10 minutes. Longer contact can cause corrosion.

Cleaning

• Always start with a cold oven.

• The stainless exterior can easily be cleaned using Lang Mfg. Prime Shine (72804-

41) oven cleaner.

• Always follow the cleaner manufacturer's instructions when using any cleaner.

• Care should be taken to prevent caustic cleaning compounds from coming in

contact with the blower wheel.

• The oven racks, rack slides, and interior may be cleaned using Lang Mfg. Foam Deluxe (72804-36) oven cleaner.

• Discoloration or heat tint may be removed using Lang Mfg. Carbon Release (72804-32) oven cleaner.

• Always apply these cleaners when the oven is cold and rub in the direction of the metal's grain.

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TROUBLESHOOTING

Symptoms

What follows is a chart of Symptoms and Possible Causes to aid in diagnosing faults with the oven. Refer to the Symptoms column to locate the type of failure then to the Possible Cause for the items to be checked. To test for a possible causes refer to the TEST section and locate the Possible Cause then refer to test to identify test procedures.

SYMPTOM POSSIBLE CAUSE

No Display

Oven will not heat

Oven motor will not run

Product burning

Product under done

• No power to cord outlet

• Oven unplugged from outlet

• Failed power cord or plug

• Failed power switch

• Contrast needs to be adjusted

• Failed display board

• Power Switch is not “ON”

• Product has not been selected

• Failed Transformer

• Failed Probe

• Failed Circuit board

• Failed Contactor

• Failed Over-temperature Thermostat

• Failed Element

• Power Switch is not “ON”

• Product has not been selected

• Failed Transformer

• Failed Contactor

• Failed Motor

• Failed Circuit board

• Product is cooked too long

• Failed Probe

• Failed Circuit board

• Product is not cooking long enough

• Failed Probe

• Failed Circuit board

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TROUBLESHOOTING CONT’D

TESTS

If an item on the list is followed by an asterisk (*), the work should be done by a factory authorized service representative.

NOTICE

WARNING

CAUTION

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.

BOTH HIGH AND LOW VOLTAGES ARE PRESENT INSIDE THIS APPLIANCE WHEN THE UNIT IS PLUGGED/WIRED INTO A LIVE RECEPTACLE. BEFORE REPLACING ANY PARTS, DISCONNECT THE UNIT FROM THE ELECTRIC POWER SUPPLY.

USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY LANG OR THEIR AUTHORIZED DISTRIBUTORS CAN CAUSE BODILY INJURY TO THE OPERATOR AND DAMAGE TO THE EQUIPMENT AND WILL VOID ALL WARRANTIES.

Possible Cause TEST

Product is cooked too long

Failed Probe

Failed Circuit board

Failed Transformer

Failed Contactor

• No test available, operational condition

• Check probe for proper resistance*

• Confirm that Circuit board is getting correct

voltage and putting out correct voltage*

• Check both Primary and Secondary coils for correct voltage*

• Remove the wires from the contactor coil and check for continuity across the contactor coil connection*

• Ensure the contactor moveable points move freely up and down*

Failed Motor

Failed or disconnected safety thermostat

Failed Element

• Confirm that motor is getting correct voltage*

• Check across the thermostat connectors for

continuity*

• Confirm that Elements are getting correct voltage and have continuity*

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PARTS LIST

Part No. Description

11090-21 Element Assembly, 240-Volt, 7500 Watts 20108-01 Stacking Pins 30200-17 Motor, 1/3HP, 208/240-Volt 30200-46 Fan, Cooling 30301-11 Door Switch, Plunger Assembly, (Between V-27971 & W-48418 except for reversible doors) 30303-19 Toggle Switch, DPDT 30401-22 30402-27 30500-15 Terminal Block, 4 Pole 30503-01 Terminal Block, 24 Pole 30600-07 Relay, 240-Volt 30701-05 Solid State Relay, 2-Pole, 24-Volt (Motor) 30702-02 Contactor, 4-Pole, 24-Volt (Heat) 31400-07 Transformer, 120/208/240-24-Volt 31400-29 Transformer, 208/240-24/12-Volt 31110-13 Ribbon Cable Assembly 40102-24 Display board 40102-26 Circuit Board, Main CPU (standard) 41100-12 Temperature Sensor Probe 50200-34 Oven Rack 50200-83 Oven Rack Slide 50313-030 Hinge Bracket Assembly, Upper and Lower 50800-12 Door Handle Assembly (includes hardware) 51100-18 Switch, Micro, Oven Door (Before V-27971 & After W-48418 and all reversible doors) 51100-53 Complete Door Assembly (with handle & hinge plate & bushing) 60101-621 Oven Baffle Assembly 60101-7661 Panel Label (with metal) 60102-136 Top Panel 60102-1361 Back Panel 60102-1364 Panel, R/H Side 60102-1365 L/H Side, Aluminum 60102-1368 Motor Cover, R/H Side 60102-147 Door Magnet 60102-97 Door Seal 70701-28 71301-04 Window Assembly 71500-06 Blower Wheel, Half-Size EH-580 Wiring Harness, Element EH-581 Wiring Harness, High Voltage Control EH-582 Wiring Harness, Low Voltage Control EH-583 Wiring Harness, Power Switch

Safety Thermostat, 495° Open Thermostat, 450°F

Knob, 450°Thermostat

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WIRING DIAGRAM 220/380 & 240/415

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Lang Manufacturing Limited Warranty to Commercial Purchasers*

(Contiguous U.S. Including Hawaii, Alaska & **Canada.)

Lang Manufacturing Equipment (“Lang Equipment”) has been skillfully manufactured, carefully inspected and packaged to meet rigid standards of excellence. Lang warrants its Equipment to be free from defects in material and workmanship for (12) twelve consecutive months. Exception: School Food Services for (36) Thirty-six consecutive months effective June 1, 2001, for all full size convection ovens with AP or AT controllers, with the following conditions and subject to the following limitations.

I. This parts and labor warranty is limited to Lang Equipment sold to the original commercial purchaser/users (but not original equipment manufacturers), at its original place of installation, in the continental United States, Hawaii and Canada.

Quartz elements are warranted for ninety (90) days from the date of installation.

II. Damage during shipment is to be reported to the carrier, is not covered under this warranty, and is the sole responsibility of purchaser/user.

III. Lang, or an authorized service representative, will repair or replace, at Lang’s sole election, and Lang Equipment, including but not limited to, safety valves, gas and electric components, found to be defective during the warranty period. As to warranty service in the territory described above, Lang will absorb labor and portal to portal transportation costs (time & mileage) for the first (12) twelve months from the date of installation or eighteen (18) months from date of shipment from Lang Manufacturing, which ever comes first.

WARRANTY

IV. This warranty does not cover routine general

maintenance, periodic adjustments, as specified in operating instructions or manuals, and consumable parts such as quartz elements, or labor costs incurred for removal of adjacent equipment or objects to gain access to Lang Equipment. This warranty does not cover defects caused by improper installation, abuse, careless operation, or improper maintenance of equipment.

V.

THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, EACH OF WHICH IS HEREBY EXPRESSLY DISCLAIMED. THE REMEDIES DESCRIBED ABOVE ARE EXCLUSIVE AND IN NO EVENT SHALL LANG BE LIABLE FOR SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES FOR THE BREACH OR DELAY IN PERFORMANCE OF THIS WARRANTY.

VI. Lang Equipment is for commercial use only. If sold as a component of another (OEM) manufacturer’s equipment, or if used as a consumer product, such Equipment is sold AS IS and without any warranty.

*Canada warranty paid in US dollars based on current exchange rates.

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Lang EHS-PP-CE Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

EQUIPMENT DESCRIPTION

UNPACKING

INSTALLATION

INITIAL START UP

OPERATION

MAINTENANCE & CLEANING

TROUBLESHOOTING

PARTS LIST

WARRANTY