hussman lth series

HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM

®

Low TemperatureMerchandisers

Models: LTH-8S and LTH-18 (1 Door ShownLTH-45 (2 Door) and LTH-68 (3 Door)

P/N 0506146_CJuly 2009

IMPORTANTRetain for End User!

Installation & Service Manual

PN0506146C

P/N 0506146_C iii

INSTALLATION

NSF Certification . . . . . . . . . . . . . . . . . . . 1-1Hussmann Product Control . . . . . . . . . . . . 1-1Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Shipping Damage . . . . . . . . . . . . . . . . . . . 1-1Installation Tool List . . . . . . . . . . . . . . . . . 1-2Unloading . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Exterior Loading . . . . . . . . . . . . . . . . . . . . 1-2Shipping Skid . . . . . . . . . . . . . . . . . . . . . . . 1-2Cabinet Leveling . . . . . . . . . . . . . . . . . . . . . 1-3Door Seal . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3Door Lock . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Shelf Installation . . . . . . . . . . . . . . . . . . . . 1-4Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Stocking . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5Condensing Unit Air Flow . . . . . . . . . . . . 1-5Load Limits . . . . . . . . . . . . . . . . . . . . . . . . 1-5

ELECTRICAL / REFRIGERATION

Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . 2-2Defrost Cycle . . . . . . . . . . . . . . . . . . . . . . . 2-2

OPERATING Safe-NET™ CONTROLS

Temperature Control . . . . . . . . . . . . . . . . . 3-1

Operating Safe-NET I Controls . . . . . . . . 3-1Setting Safe-NET I Time . . . . . . . . . . . . . . 3-2Escape Menu . . . . . . . . . . . . . . . . . . . . . . . 3-2Safe-NET I Defrosts . . . . . . . . . . . . . . . . . 3-2Set Defrost Time (Safe-NET I Only) . . . . 3-3Alarms (Safe-NET I Only) . . . . . . . . . . . . 3-4

Operating Safe-NET III Controls . . . . . . . 3-5Safe-NET III Alarms and Codes . . . . . . . 3-6Safe-NET Wiring Diagrams

for LTH-8S . . . . . . . . . . . . . . . . . . . . . . . 3-7for LTH-18 . . . . . . . . . . . . . . . . . . . . . . . 3-8for LTH-45 & 68 . . . . . . . . . . . . . . . . . . . 3-9

MAINTENANCE

Care and Cleaning . . . . . . . . . . . . . . . . . . . 4-1Exterior Surfaces . . . . . . . . . . . . . . . . . . 4-1Interior Surfaces . . . . . . . . . . . . . . . . . . . 4-1Cleaning Shelves . . . . . . . . . . . . . . . . . . . 4-2Cleaning Coils . . . . . . . . . . . . . . . . . . . . . 4-2Optional Reversing Condenser Fan . . . 4-3Cleaning Wash Out Drain . . . . . . . . . . . 4-4

Tips and Trouble Shooting . . . . . . . . . . . . 4-4

SERVICE

Replacing Fluorescent Lamps . . . . . . . . . . 5-1Replacing Display Lamp . . . . . . . . . . . . . . 5-1Replacing Interior Lamps . . . . . . . . . . . . . 5-2Replacing Electronic Ballasts . . . . . . . . . . . 5-3

WARRANTY

IMPORTANTKEEP IN STORE FOR FUTURE REFERENCE

Quality that sets industry standards!12999 St. Charles Rock Road • Bridgeton, MO 63044-2483

U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900

www.hussmann.com© 2009 Hussmann Corporation

®

CONTENTS

REVISION HISTORY

Revision C — June 2009Added LTH-45 and LTH-68 modelsUpdated wiring diagramsAdded Safe-NET I codesAdded Safe-NET III information

Revision B — Added Safe-NET™Restructured manual; added Maintenanceinformation

Revision A —Original Issue

P/N 0506146_C

iv

U.S. & CANADA 1-800-922-1919 • MEXICO 1-800-522-1900 • WWW.HUSSMANN.COM

NSF CERTIFICATION

These merchandisers are manufactured to meetANSI / National Sanitation Foundation(NSF® ) Standard #7 requirements. Properinstallation is required to maintain certification. Near the serial plate, each casecarries a label identifying the type ofapplication for which the case was certified.

ANSI/NSF-7 Type I - Display Refrigerator / Freezer

Intended for 75°F / 55% RH Ambient Application

ANSI/NSF-7 Type II - Display Refrigerator / Freezer

Intended for 80°F / 55% RH Ambient Application

ANSI/NSF-7 - Display Refrigerator

Intended for Bulk Produce

HUSSMANN PRODUCT CONTROL

The serial number and shipping date of allequipment is recorded in Hussmann’s files forwarranty and replacement part purposes. Allcorrespondence pertaining to warranty or partsordering must include the serial number ofeach piece of equipment involved. This is toensure the customer is provided with the correct parts.

LOCATION

These merchandisers are designed for displaying products in air conditioned storeswhere temperature is maintained at or belowthe ANSI / NSF-7 specified level and relativehumidity is maintained at or below 55%.

Recommended operating ambient temperature isbetween 65° F (18° C) with a maximum 55% relative humidity to 80 F (26° C) with a maximum 55% relative humidity.

Placing refrigerated merchandisers in directsunlight, near hot tables or near other heatsources could impair their efficiency. Like othermerchandisers, these self-contained units aresensitive to air disturbances. Air currents passing around merchandisers will seriouslyimpair their operation. Do NOT allow air conditioning, electric fans, open doors or windows, etc. to create air currents around thecase. LTH units take in discharge air throughthe front of the case, and require no clearancespace on top, at the back or either side.

Product should always be maintained at proper temperature. This means that from the timethe product is received, through storage, preparation and display, the temperature of theproduct must be controlled to maximize the lifeof the product.

SHIPPING DAMAGE

All equipment should be thoroughly examinedfor shipping damage before and during unloading. This equipment has been carefullyinspected at our factory. Any claim for loss ordamage must be made to the carrier. The car-rier will provide any necessary inspectionreports and/or claim forms.

Apparent Loss or DamageIf there is an obvious loss or damage, it mustbe noted on the freight bill or express receiptand signed by the carrier’s agent; otherwise,carrier may refuse claim.

Concealed Loss or DamageWhen loss or damage is not apparent untilafter equipment is uncrated, retain all packingmaterials and submit a written response to thecarrier for inspection, within 15 days.

P/N 0506146_C 1-1

LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM

INSTALLATION

INSTALLATION TOOL LIST

Unloading from Trailer:Lever Bar (also known as a Mule, Johnson Bar,J-bar, Lever Dolly, or Pry Lever)

UNLOADING

Move the merchandiser as close as possible toits permanent location and remove all packaging. Check for damage before discardingpackaging. Remove all separately packedaccessories such as kits and shelves.

Improper handling may cause damage to themerchandiser when unloading. To avoid damage:

1. Do not drag the merchandiser out of thetrailer. Use a Johnson bar (mule).

2. Use a forklift or dolly to remove the merchandiser from the trailer.

EXTERIOR LOADING

Do NOT walk on top of merchandisers or damage to the merchandisers and serious personal injury could occur.

THEY ARE NOT STRUCTURALLYDESIGNED TO SUPPORT EXCESSIVEEXTERNAL LOADING such as the weight ofa person. Do not place heavy objects on thecase.

SHIPPING SKID

Each case is shipped on a skid to protect themerchandiser’s base, and to make positioningthe case easier.

Remove the top of the crate and detach wallsfrom each other. Lift crate from the skid.Unscrew the case from the skid. The fixturecan now be lifted off the crate skid. Lift only atbase of skid! Remove any braces and/or skidsattached (blanket wrapped merchandiser mayhave skids).

DO NOT LAY MERCHANDISER’S BACKON THE FLOOR TO REMOVE SKID.

Once the skid is removed, the case must be lifted -NOT PUSHED- to reposition. Toremove the skid, remove screws attaching skidto the merchandiser.

Check floor where cases are to be set to see ifit is a level area. Determine the highest part ofthe floor.

P/N 0506146_C

1-2 Installation

U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM

CAUTION!

!

Do not walk or put heavy objects on case.

CABINET LEVELING

This merchandiser must be installed level (fromback to front, and side to side) to allow maxi-mum draining of the condensate water as wellas proper door alignment and operation.Choose a level area to install case.

LTH-8S and LTH-18 cases have one adjustable cabinet foot at each bottom corner for easyadjustment if required. LTH45 and LTH68also have an adjustable foot at center front andback. Turn the foot levelers clockwise to addlength to each foot for leveling.

When optional 6-inch legs are used, screw thelegs tight to the merchandiser base and thenadjust the feet.

When optional casters are used, screw themtight to the merchandiser base. Once in finalposition, lock each caster.

DOOR SEAL

Check that hinge doors close automatically byopening the door 45 degrees and releasing.Ensure door closes and gasket seals door shut.To adjust the torque applied to the hingeddoor:

1. Place a wrench on each of the two lowersupport nuts located at the bottom hinge.

2. Loosen the lower nut while holding theupper nut in place.

3. Torque is increased or decreased by rotatingthe top nut. After adjustments are made, tight-en the bottom nut while holding the upper nutin place. Torque bottom nut to a minimum of20 ft-lb.

P/N 0506146_C 1-3


Adjustable Foot

Adjust Door Closing Torque

Lock Each Caster

Thumbscrew Lock

DOOR LOCK

A door lock is standard on all doors. The keyis tie-wrapped to the door handle at shipment.

SHELF INSTALLATION

After the cabinet is leveled, the shelves may beinstalled. Wire shelves are adjustable. Shelfspacing can be adjusted by positioning theshelf clips according to individual loadingrequirements.

LTH-8S merchandisers have three movable wireshelves and one solid shelf. LTH-18, LTH-45and LTH-68 merchandisers have four movablewire shelves and one solid shelf, per door

NOTE: The movable wire shelves may bereversed so that the wire shelf lip is positionedin the front as a product stop.

LAMPS

This merchandiser has a light switch that operates both the display and the interiorlamps. Interior lamps are equipped with a plastic shield for safety.

P/N 0506146_C

1-4 Installation


Shelves

Solid Shelf

NOTE:

Do not move the Solid

Shelf at the front of case

Display Lamp with Cover Removed

Light Switch

Solid ShelfCase Front

Door

Lock

STOCKING

Product should NOT be placed in case untilmerchandiser is at proper operating tempera-ture. The LTH merchandisers must remain inoperation for at least 24 hours before productmay be loaded into case.

Proper rotation of product during stocking isnecessary to prevent product loss. Always bringthe oldest product to the front and set thenewest to the back.

AIR DISCHARGE AND RETURN GRILLEMUST REMAIN OPEN AND FREE OFOBSTRUCTION AT ALL TIMES

Do not allow product, packages, signs, etc. toblock air discharge or return grille. Do not usenon-approved shelving, baskets, display racks,or any accessory that could hamper air curtainperformance. DO NOT STOCK PRODUCT IN THE

TOP FOUR INCHES OF LTH CASES BECAUSE

PRODUCT WILL BLOCK THE COLD AIR FLOW.

CONDENSING UNIT AIR FLOW

An optional reversing condenser fan is avail-able for all LTH models. The condenser fanruns in reverse during the defrost cycle to clearthe condenser coil of debris that was accumu-lated during the refrigeration cycle.

LOAD LIMITS

Product must be within designated load limitto ensure proper refrigeration and air curtainperformance.

P/N 0506146_C 1-5


Load Limit for LTH-8S Merchandisers

Load Limit for LTH-18, LTH-45 and LTH-68Merchandisers

NO PRODUCT

within 4 inches

of top

NO PRODUCT

within 4 inches

of top

At no time should product be stocked:

• Beyond the front of shelves

• Near the air discharge duct located at the top rear of case

• Near or covering the front return air grille

• Within four inches of the top of the cabinet (This space must be free of product and other materials.)

DO NOT LOAD CASE WITH WARM PRODUCT.

Notes:

P/N 0506146_C

1-6 Installation


PLUG

The plug cord is 9 ft long and is located on theright hand rear of the merchandiser.

Disconnect power before servicing. LTH merchandisers require a dedicated electrical circuit with ground. 12AWG is the minimumsized acceptable wire.

• The LTH-18 and LTH-8S require a dedicated15 AMP circuit with grounded wall recepta-cle (NEMA 5-15R).

• The LTH-45 requires a dedicated 15 AMP circuit with a grounded wallreceptacle (NEMA 6-15R).

• The LTH-68 requires a dedicated 20 AMP circuit with a grounded wall receptacle(NEMA 6-20R).

• Always use a dedicated circuit with the amperage stated on the unit.

• Plug into an outlet designed for the plug.• Do not overload the circuit• Do not use long or thin extension cords.

Never use adapters.• If in doubt, call an electrician.

If the power supply oscillates beyond the rangegiven in the following table, a voltage regulatoris required.

P/N 0506146_C 2-1


ELECTRICAL / REFRIGERATION

— LOCK OUT / TAG OUT —To avoid serious injury or death from electricalshock, always disconnect the electrical powerat the main disconnect when servicing orreplacing any electrical component. Thisincludes, but is not limited to, such items asdoors, lights, fans, heaters, and thermostats.

DANGER!

!

Dimensions

Exterior Interior Movable Total Capacity

Model Height Width Depth Height Width Depth Shelves Shelves (Cubic Ft) Doors

LTH-8S 60 3/4 24 1/2 28 3/4 40 1/2 20 5/8 20 1/4 3 4 10.6 1

LTH-18 80 3/4 29 3/8 32 1/4 54 25 3/8 27 3/4 4 5 22 1

LTH-45 80 3/4 52 32 1/4 54 48 27 3/4 8 10 41.6 2

LTH-68 80 3/4 78 1/4 32 1/4 54 74 1/4 27 3/4 12 15 64.4 3

Nominal Minimum MaximumVoltage Voltage Voltage

120 108 132

208-230 188 253

REFRIGERATION

Each LTH merchandiser will have either Safe-NET I or Safe-NET III.

All LTH merchandisers are equipped with ahermetic compressor. The condenser has a finand tube construction. Cold discharge air flowsfrom the top air duct on the back of the case.Air is returned through the bottom front returnair grille.

DEFROST CYCLE

All LTH merchandisers require defrost cyclesfor proper operation. The defrost cycles arefactory set.

Merchandisers are set to defrost three timeseach day. During defrost, the evaporator fansoperate intermittently to clear any condensa-tion from the interior side of the door. Defrostis initiated by Safe-NET I or Safe-NET IIIcontrol, and is terminated according to coiltemperature. In the event the sensor does notterminate the defrost cycle, a fail-safe value isprogrammed to terminate on time.

All LTH merchandisers are factory set withthree defrost cycles, every 8 hours. For merchandisers with Safe-NET I, defrosts areprogrammed to start at 0600, 1400 and 2200.The defrost times can be changed with theSafe-NET I control. The clock should beadjusted after the unit is plugged in (seeinstructions on page 3-1).

For merchandisers with Safe-NET III, thedefrost cycle is initiated at start-up and every8 hours thereafter. If the power is interrupted,the defrost resets to this time. The defrost canbe reset to a desired time by unplugging andrestarting the merchandiser at the preferredtime.

P/N 0506146_C

2-2 Electrical / Refrigeration


If the display looks like this,

you have a Safe-NET I control

Safe-NET I Control

Safe-NET III Control


you have a Safe-NET III control

After the defrost cycle, evaporator fans aredelayed from starting to prevent water frombeing blown out of the evaporator pan. Fansare also delayed during initial startup forapproximately 10 minutes.

Note: To reduce accumulation of frost on theevaporator coil, the fans will cycle off witheach door opening and back on as the doorcloses.

P/N 0506146_C 2-3


Evaporator Fans

Notes

P/N 0506146_C

2-4 Electrical / Refrigeration


TEMPERATURE CONTROL

Safe-NET is the electronic controller that regulates the merchandiser’s cooling system.Before Safe-NET I can operate correctly, theinternal clock must be set. This will allow it toregulate the system for defrost at convenienttimes of the day around your location’s schedule — when you are not at the busiestserving times.

The Safe-NET control is located in the frontgrille below the door.

All LTH merchandiser models are preset towith three defrosts per day. In most situationsthis will be enough defrosts unless the unit isoperated in non-air conditioned environmentsor high humidity locations.

The temperature of the air entering the evaporator depends on surrounding ambienttemperature and the amount of time the merchandiser has been running.

OPERATING Safe-NET I CONTROLS

When power is first applied, the Safe-NET I display will show the version of softwareinstalled: the text “Safe-NET 9.04” or highershould scroll across the display.

P/N 0506146_C 3-1


Safe-NET™ CONTROLS

Safe-NET I Control


you have a Safe-NET I control

Safe-NET III Control


you have a Safe-NET III control

To access and adjust Safe-NET I:

• Plug in the LTH merchandiser.• Open the Safe-NET I controller using a smallflat blade screwdriver to pop off the oval cover(this may be tight).

• You will see three buttons on the controlboard as shown in this photo.

The SELECT button is used to view EASYmenu, and to edit/confirm values. Use the UPor DOWN buttons to move to the next item inthe menu or change the value of a parameter.

SETTING SAFE-NET I TIME

Set the Clock using the Easy Access Menu.

Press SELECT to enter the Easy Access Menu.• Use Up or Down buttons to scroll throughmenu until CLOC is displayed.

• The Display will cycle between CLOC andthe currently programmed time.

• Press the SELECT button when the time isdisplayed.

• The Minutes value will begin to flash• Use the Up and Down buttons to change tothe desired value.• Press SELECT to confirm minutes entry.

The Hours value begins to flash.• Use the Up and Down buttons to change tothe desired value.• Press SELECT to confirm minutes entry.• The clock is now set.

ESCAPE MENU

To leave a Menu and return to the default display, press the UP and DOWN buttons onthe Safe-NET I display module simultaneously.

Safe-NET I DEFROSTS

These refrigeration units must go into defrostmode at least twice each day to maintain optimal performance. During defrost, the tem-perature display may rise 2-3°F (1-2°C). Avoidopening the door during the defrost cycle.During defrost, the digital display will showdEFr or dF. Defrost is done automatically withSafe-NET I. Defrost water drains to a drip panwhere it evaporates. In the event of power loss,the clock will retain the time before the loss.

P/N 0506146_C

3-2 Safe-NET™ Controls


SELECTButton

UPButton

DOWNButton

CLOC HH MM

LTH merchandisers are factory set with threedefrost cycles, eight hours apart. The first is setto 0600, the second to 1400 and the third is setto 2200. If these preset defrost times areacceptable to your business, no settings need tobe changed. Replace the Safe-NET I cover andgrille.

If the preset times need to be changed for yourbusiness schedule, or if additional defrosts areneeded because the merchandiser is in an envi-ronment out of the normal temperature range,the Safe-NET I controller can be set to meetthe requirements of your business.

LTH merchandisers have a door heater that iscontrolled by Safe-NET I. If condensationforms on the exterior of the door or doorframe, check that store ambient temperature isless than 80°F (27°C) and relative humidity isless than 55%. If condensation persists, calltech support.

SET DEFROST TIME (Safe-NET I Only)

• Press SELECT to enter the Easy AccessMenu.• Use Up or Down buttons to scroll throughmenu until Star is displayed.

• The Display will cycle between Star and thecurrently programmed time.

• Press the SELECT button when the time isdisplayed.• The Minutes value will begin to flash. • Use the Up and Down buttons to change tothe desired value.• Press SELECT to confirm entry. The Hoursvalue will begin to flash. • Use the Up and Down buttons to change tothe desired value.• Press select to confirm entry.• The Defrost start time is now set.

Replace Safe-NET I CoverPosition the cover over the display and gentlypress into place.

P/N 0506146_C 3-3


StAr HH MM

ALARMS (Safe-NET I Only)

A red LED on the board turns on duringalarm. The display will show a four-characterword for about 3 seconds alternating with thedefault display for 9 seconds.

Alarm with Sensor Number – “SEnS”This alarm is generated when the control is ini-tialized, and indicates that the number of sen-sors entered in the control is different from thenumber of sensors connected to the control.

This Alarm can be cleared only by changingthe reading for number of sensors to 0 andresetting the display module or by pressing theSELECT button while the display is showingSAFE – NET during power up which thenupdates the reading to the number of sensorsconnected. This is caused by the control notbeing set up correctly or by a sensor havingfailed. If the problem persists, call an author-ized technician.

Alarm with Sensor reading – “noSn”This alarm is generated when the display mod-ule is unable to read the sensors for five consec-utive seconds. This may be caused by a sensorbeing disconnected or shorted. This alarmclears automatically when the control is able toread the sensors. If the problem persists, call anauthorized technician.

Discharge Air High Alarm – “dSHi”This alarm is generated when the average dis-charge air temperature in the case, over theprogrammed alarm delay time, is higher thanthe High Alarm value stored in the control.This alarm will clear if the average dischargeair temperature goes below the High alarmvalue. THIS ALARM IS AVAILABLE ONLY IF DIS-CHARGE SENSORS ARE INSTALLED.

Discharge Air Low Alarm – “dSLo”This alarm is generated when the average dis-charge air temperature in the case, over theprogrammed alarm delay time, is lower thanthe Low Alarm value stored in the control.This alarm will reset if the average dischargeair temperature goes higher than Low alarmvalue.

THIS ALARM IS AVAILABLE ONLY IF DISCHARGE

SENSORS ARE INSTALLED.

P/N 0506146_C



P/N 0506146_B

OPERATING Safe-NET III CONTROLS

The Safe-NET III electronic temperature anddefrost controller is located in the cassettecompartment. The controller comes factory setat position #5 and is ready to go.

The front grille must be removed in order toaccess this control. To remove the grille, openthe door and remove the two plastic screws andretainers on the top of the grille, then tilt outand lift up to remove.

When removing the grille for this operation orfor condenser cleaning, care must be taken notto damage the display interface cable. It may beunplugged during this task.

The temperatures can be adjusted by rotatingthe knob counter-clockwise for a warmer set-point, or clockwise for a colder setpoint. Thedisplay shows the setpoint for a few secondswhen changed, then reverts to showing thesensed temperatures in the merchandiser.

The adjustment knob allows the user to select apre-configured cold setpoint, warm setpoint orany setpoint within this range. The adjustmentknob is also configured with OFF/ON function-ality to power off the controller.

The off position shuts off the compressor only.UNPLUG THE UNIT FOR SERVICE.

P/N 0506146_C 3-5


Safe-NET III Controller Location

Remove Plastic Screws

Unplug Interface Cable

Interface

Cable Plug

Remove Plastic Screws

Position #5

The top, or green, LED indicates the case is inrefrigeration mode. The center, or yellow, LEDindicates the case is in defrost mode. The bot-tom (red) LED indicates an alarm condition,such as merchandiser warming up because thedoor is not closed.

The defrost cycle is initiated at power on. (Thiscycle will quickly terminate on the initial start-up of a warm merchandiser.) Another defrostcycle will follow every 8 hours thereafter. Thedefrost times will reset whenever power is inter-rupted. Therefore, the standard defrost timescan be reset by interrupting power (full stop,then start) at the desired time. This will reset the initial time and restart the 8-hour cycle.

Safe-NET III has a manual, or forced, defrostfeature. Following is the procedure to activate amanual defrost:1. Rotate the potentiometer fully counter-

clockwise.2. Rotate the potentiometer fully clockwise.3. Rotate the potentiometer fully counter-

clockwise.4. Rotate the potentiometer fully clockwise.

The sequence must be completed in less that 3seconds, but more than 1.5 seconds.

During the compressor-on time (1 minute), or compressor-off time (2 minutes), built-in protection time will delay the defrost initiation.If you force a defrost cycle during this time, the feature will initiate but not start until thecompressor protection mode times out.

ALARMS AND CODES

Safe-NET III is available with an audible alarm(located in the display module) that sounds inthe event a failure occurs.

Troubleshooting

P/N 0506146_C



Alarm

or Code Indicates Action

Red LED • Firmware • Call Serviceremains ON corruption on immediatelyafter startup controller

• Controller is not operating

Red LED turns • Case • Make sure the door on during temperature is closedoperation is too warm • Make sure that cold

or too cool air is not being blocked or deflected• Check the temperature using the optional display or a thermometer• If the LED does not turn off after on hour,call Service

Red LED • Temperature • Check the optional flashes sensor failure display for error code

• E1 indicates E1 or E2 and call a case Service immediatelytemperature failure• E2 indicatesan evaporator temperature sensor failure

Safe-NET III Indicators

Compressor

Powered on

GREEN

Defrost Cycle

YELLOW

Alarm

RED

Off / On Position

WIRING DIAGRAMS

P/N 0506146_C 3-7


Model LTH-8S III

Model LTH-8S I

Model LTH-8S

Wiring Diagram — LTH-8S

P/N 0506146_C



Model LTH-18 III

Model LTH-18 I

Model LTH-18

Wiring Diagram — LTH-18

P/N 0506146_C 3-9


Models LTH-45 and LTH-68

Model LTH-45 & LTH-68 with

I

Model LTH-45 & LTH-68 with

III

Wiring Diagram — LTH-45 and LTH-68

NOTES

P/N 0506146_C



CARE AND CLEANING

Long life and satisfactory performance of anyequipment is dependent upon the care itreceives. To ensure long life, proper sanitationand minimum maintenance costs, this unitshould be thoroughly cleaned, all debrisremoved and the interiors washed down.Cleaning often will control or eliminate odorbuildup. Frequency of cleaning is dependenton usage and local health requirements.

Exterior Surfaces

The exterior surfaces must be cleaned with amild detergent and warm water to protect andmaintain their attractive finish.

NEVER USE ABRASIVE CLEANERS OR SCOURING

PADS. NEVER USE CAUSTIC SODA, KEROSENE,GASOLINE, THINNER, SOLVENTS, DETERGENTS,ACIDS, CHEMICALS OR ABRASIVES. DO NOT USE

AMMONIA-BASED CLEANERS ON ACRYLIC PARTS.

Interior Surfaces

DO NOT USE AMMONIA-BASED PRODUCTS TO

CLEAN LIGHT SHIELDS. NEVER USE ABRASIVE

CLEANSERS OR SCOURING PADS.

The interior surfaces may be cleaned with mostdomestic detergents and sanitizing solutionswith no harm to the surface. Always read andfollow the manufacturer's instructions whenusing any cleaning product.

Do NOT Use:• Abrasive cleansers and scouring pads, as

these will mar the finish.• Coarse paper towels on coated glass.• Ammonia-based cleaners on acrylic parts.• A hose on lighted shelves or submerge the

shelves in water.• Solvent, oil or acidic based cleaners on any

interior surfaces.• A hose on rail lights, canopy lights or any

other electrical connection.

Do:• First turn off refrigeration, then disconnect

electrical power.• Remove product and loose debris.• Thoroughly clean all surfaces with soap and

hot water. DO NOT USE STEAM OR HIGH WATER

PRESSURE HOSES TO WASH THE INTERIOR.THESE DESTROY MERCHANDISER’S SEALING

CAUSING LEAKS AND POOR PERFORMANCE.• Take care to minimize direct contact between

fan motors and cleaning or rinse water.• Rinse with hot water, but do NOT flood. • Allow merchandiser to dry before resuming

operation.• Wipe down lighted shelves with a damp

sponge or cloth so that water does not enterthe light channel. DO NOT USE A HOSE OR

SUBMERGE SHELVES IN WATER.• After cleaning is completed, restore power

and turn on the merchandiser.

P/N 0506146_C 4-1


MAINTENANCE

Do not use HOT water on COLD glass surfaces.This can cause the glass to shatter and couldresult in personal injury. Allow glass fronts,ends and service doors to warm before applyinghot water.

WARNING!

To reduce the risk of fire, electrical shock orinjury when cleaning this merchandiser:

• Unplug the merchandiser before cleaning;• Keep all liquids away from electrical and

electronic components;• Do not use any mechanical device or other

means to speed the defrost process, exceptas recommended by the manufacturer.

WARNING!

Cleaning Shelves

Shelves and shelf clips are easily removed forcleaning the interior as well as the shelvesthemselves

Cleaning Coils

To maintain peak operating efficiency, the coilshould be cleaned at least once each month. Adirty coil slows product cooling significantlyand increases energy consumption by as muchas 20%. Dirt buildup on coils can also causethe compressor to lock up damaging the con-denser unit.

• Remove screws on top of each side of thelouvered from grille, then lift off the grille.

Detach Safe-NET I electrical wire harnesses.The harnesses are located behind the Safe-NET I controller. The power/relay harness onthe left has an eight-slot connector. The sensorcable harness on the right has a four-slot con-nector. When re-installing, be sure to plug thisharness in the bottom four-slot connection, notthe top connection.

Next, detach the merchandiser’s electrical wireharness located on the right hand side near thecoil. For Safe-NET III, detach the interfacecable to the display.

P/N 0506146_C

4-2 Maintenance


Remove Screws at Top of Grille (LTH-18 shown)

Disconnect Safe-NET I Harnesses

Unplug Power Harness

Product will be degraded and may spoil if allowed to sit

in a non-refrigerated area.

NOTICE Power/Relay Cable Sensor Cable

Unplug Safe-NET III Interface Cable

Interface

Cable Plug

Remove the two screws securing refrigerationunit cassette in place.

Use the center black bar to pull the refrigera-tion unit’s cassette forward to access the coils.

USE ONLY THE CENTER BAR TO PULL OUT THE

CASSETTE. PULLING ON REFRIGERATION LINES

OR OTHER PARTS WILL CAUSE DAMAGE TO THE

REFRIGERATION UNIT.

Use a soft hand brush attachment on a vacuumto remove accumulated dust and debris.

Consult an authorized service technician ifmore extensive cleaning is needed.

If the refrigeration unit is damaged, it can bereplaced with a new cassette.

Optional Reversing Condenser Fan

If your merchandiser is equipped with theoptional reversing condenser fan, you maynotice the condenser fan running during thedefrost cycle. This is normal in this application.The purpose of reversing the air direction during defrost is to remove lint and dust thataccumulates on the condenser fin surfaces during the refrigeration cycle. This featurereduces the need to clean the condenser manually, and increases compressor lifebecause of lower condensing temperatures.

P/N 0506146_C 4-3


For prompt service when contacting the factory, be sure to have the case model and

serial number from the case serial plate.

IMPORTANTINFORMATION

Use Center Bar to Pull Cassette

Remove Screws Holding Cassette

Center Bar

Cleaning the Wash Out Drain

The wash out drain is located behind the refrig-eration cassette and can be cleaned with waterand wiped with a soft cloth. Ensure drain isunobstructed before replacing cassette.

The washout drain flows into an auxiliarywaste line.

Next remove the auxiliary waste line cap todrain any excess water. Place a dry towel overthe line to absorb water.

Replace cap, cables and cassette.

TIPS AND TROUBLESHOOTING

There are a few simple things to check beforecalling for service:

1. Product not cold? Refrigeration unit requires24 hours at initial startup to cool down tooperating temperature with NO PRODUCT

INSTALLED in merchandiser. Ask when merchandiser was stocked, and what theusage has been. It may take 30 minutes ormore for product to chill following stocking.

2. Check the door and door seal for air leaks.

3. Power Supply:Is the unit plugged in? Is there power to the unit?

4. LocationWhat are the ambient conditions—temperature and humidity, direct sun, nearbysource of heat, such as oven or grill? Is theunit level?Has the unit been moved recently?

5. Shelves and StockingAre the standard shelves in the correctplaces?Is the product stocked properly?Is the bottom shelf at the proper location?

6. Confirm that the defrost schedule is properly set using Safe-NET I.Check for Safe-NET error messages.

P/N 0506146_C

4-4 Maintenance


P/N 0506146_B

Auxiliary Waste Line

Replace Cap, Cables and Cassette

For prompt service when contacting the factory, be sure to have the case model and

serial number from the case serial plate.

IMPORTANTINFORMATION

Cap

Cable

Wash Out Drain

Drain

REPLACING FLUORESCENT LAMPS

Fluorescent lamps have a plastic shield. Whenthe lamp is replaced, keep the lamp shield toinstall over the new lamp..

The switch under the display lamp cover oper-ates both the display lamp and interior lamps.

REPLACING DISPLAY LAMP

Disconnect power to the merchandiser.Remove plastic pins attaching the display lamppanel. There are three pins at the bottom ofthe display cover and two on top of the displaypanel.

Remove the merchandiser’s display cover paneland change out the lamp. Replace the displaypanel cover.

P/N 0506146_C 5-1


SERVICE

— LOCK OUT / TAG OUT —To avoid serious injury or death from electricalshock, always disconnect the electrical powerat the main disconnect when servicing orreplacing any electrical component. Thisincludes, but is not limited to, such items asdoors, lights, fans, heaters, and thermostats.

DANGER!

Remove Plastic Pins Attaching Display Lamp

Plastic Shield

Fluorescent Lamp

Remove Plastic Pins Attaching Display Lamp

Display Cover Panel Removed

Pin

REPLACING INTERIOR LAMPS

LTH merchandisers have interior case lamps.The lamps are protected by a clear, plasticshield. Remove the shield to replace lamp.Wedge a small putty knife at the top rear ofthe lamp, then carefully loosen the shield fromthe side of the merchandiser.

Once the shield is out of rear track, the lampshield can be removed from the merchandiser.

Remove lamp shield and change out lamp.Replace lamp shield at bottom corner bracketfirst. Next, bow lamp shield and replace shieldinto top corner bracket. Smooth shield toensure a good replacement fit for the lampshield.

P/N 0506146_C

5-2 Service


Wedge Putty Knife at Top Rear of Display Lamp

Bow Shield to Replace

Remove Shield from Display Lamp

REPLACING ELECTRONIC BALLASTS

The electronic ballast for the LTH-8S is locatedon the refrigeration cassette. This ballast operates the interior lamp.

The electronic ballast for the LTH-18, LTH-45and LTH-68 is located on the top of the merchandiser under a sheet metal enclosure.(LTH-68 shown.)

To access the ballast, the protective enclosure isremoved by removing screws as shown below.

P/N 0506146_C 5-3


Remove Screws from Enclosure

Ballast Location

Screw

Screw

Ballast

Notes:

P/N 0506146_C

5-4 Service


®

To obtain warranty information or other support, contact your

Hussmann representative. Please include the model and serial number of the product.

Hussmann Corporation, Corporate Headquarters: Bridgeton, Missouri 63044-2483 U.S.A.

hussman lth series

Documents