Lang EHS-T Service Manual

Installation, Operation, & Maintenance

Model: EHS-T,

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-T

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.

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-T oven is a forced air convection oven with a vented oven cavity.

A 1/3 HP fan motor drives the air.

Controls

Easy to use manual control knobs.

Technical

Oven operates as shipped on either 208, 240, or 480-Volt Single, or Three Phase.

The oven can be shipped with a Power Cord and Plug attached, but must be specified upon ordering (part number is listed in the Parts portion of this manual).

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 unit 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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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.

The EHS-T can be purchased with a Cord & Plug kit (Part number is listed in the parts portion of this manual.). This kit includes a 48” cord with a NEMA L15-30P plug

Oven Voltage

The Lang Model EHS oven can be operated on 208, 240 (single or three phase), or 480-volt (three phase only) source. The 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.

Confirm that both thermostat knob and timer knob move freely and that the timer beeps.

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

Pulse fan switch. Pulse fan setting will only turn the fan on when the oven is calling

OPERATION

ON

Power switch.

OFF

PULSE FAN HI-SPEED

Dual speed switch. Toggles the fan between high and low speed.

Temperature Control. Allows temperature to be set in 25°F increments from 140°F.

Typical Operation Sequence

ACTION RESULT

Turn power switch to ON. Control panel heat call light comes on.

Adjust proper temperature, between 140°F& 450°F and allow to preheat up to 20 minutes.

TEMP

TIME

FAN

LOW-SPEED

Timer Control. Electronic one hour timer with continuous beeper.

Oven begins heating.

Open oven doors and insert product, set timer up to 60 minutes.

Timer beeps continuously when done. Product should now be done.

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Timer begins counting down.

12

OPERATION CONT’D

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.

Do not open the oven doors during baking as this will change the baking characteristics 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 an 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

Power indicator is not lit.

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

• Failed indicator light

• Power Switch is not “ON”

• Failed Transformer

• Thermostat

• Failed Contactor

• Failed Over-temperature Thermostat

• Failed Element

• Power Switch is not “ON”

• Failed Transformer

• Failed Contactor

• Failed Motor

• Product is cooked too long

• Failed Thermostat

• Product is not cooking long enough

• Failed Thermostat

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NOTICE

TROUBLESHOOTING CONT’D

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.

WARNING

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.

TESTS

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

Possible Cause TEST

Product is cooked too long

Failed Thermostat

Failed Transformer

Failed Contactor

Failed Motor

• No test available, operational condition

• Confirm that Thermostat is getting correct

voltage and working properly*

• 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*

• Confirm that motor is getting correct voltage*

Failed or disconnected safety thermostat

Failed Element

CAUTION

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.

• Check across the thermostat connectors for continuity*

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

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PARTS LIST

DESCRIPTION PART NO.

Element EHS Oven 208 Volt 5000 Watts 11090-23 Element EHS Oven 240 Volt 5000 Watts 11090-24 Stacking Pins 20108-01 Motor 1/3 HP 115/208/240 Volt 30200-12 Switch Toggle On-Off 30303-06 Thermostat Safety 490°F Open Thermostat 450°F Oven Terminal Block 3 Pole 30500-09 Contactor 3 Pole 208/240 VAC 30700-05 Contactor 2 Pole 208/240 VAC 30701-03 Timer Mechanical Long Ring 30801-01 Fuse 15 Amp 30900-10 Fuse Holder 15 Amp 30901-08 Pilot Light 208/240V 6” Lead Black Body 31601-01 Rack 50200-34 Rack Slide 50200-83 Door Handle 11 1/2” Long Black “T” Style 50800-12 Complete Door Assembly 51100-53 Baffle 60101-621 Door Magnet 60102-147 Top Panel 60102-136 Rear Panel 60102-1361 Right Hand Panel 60102-1364 Switch, Plunger 60102-40 Switch Plunger Oven Door (Between V-27971 & W-48418, Except for reversible doors) Switch Micro Oven Door (Before V-27971 & After W-48148 and all reversible doors) Door Seal 60102-97 Hinge Bracket Assembly, Upper and Lower 50313-030 Knob Manual Timer 70701-09 Knob Thermostat 450°F Oven Window Assembly, Oven Door 71301-04 Blower Wheel 71500-06 Cord and Plug Kit 60101-75

60102-102 30402-27

30301-11

51100-18

70701-16

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WIRING DIAGRAM 208/240

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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-T 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