hussman lth series
TRANSCRIPT
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
If the display looks like this,
you have a Safe-NET I control
Safe-NET I Control
Safe-NET III Control
If the display looks like this,
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
Evaporator Fans
Notes
P/N 0506146_C
2-4 Electrical / Refrigeration
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
Safe-NET™ CONTROLS
Safe-NET I Control
If the display looks like this,
you have a Safe-NET I control
Safe-NET III Control
If the display looks like this,
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
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
3-4 Safe-NET™ Controls
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
3-6 Safe-NET™ Controls
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
Model LTH-8S III
Model LTH-8S I
Model LTH-8S
Wiring Diagram — LTH-8S
P/N 0506146_C
3-8 Safe-NET™ Controls
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
Model LTH-18 III
Model LTH-18 I
Model LTH-18
Wiring Diagram — LTH-18
P/N 0506146_C 3-9
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
3-10 Safe-NET™ Controls
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
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
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
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
LTH ManualHUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
Remove Screws from Enclosure
Ballast Location
Screw
Screw
Ballast
Notes:
P/N 0506146_C
5-4 Service
U.S. & Canada 1-800-922-1919 • Mexico 1-800-522-1900 • WWW.HUSSMANN.COM
®
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.