Hussmann Low Temperature Merchandiser LTH-68

To maintain peak operating efficiency, the coil should be cleaned at least once each month.

A dirty coil slows product cooling significantly and increases energy consumption by as much as 20%. Dirt buildup on coils can also cause the compressor to lock up damaging the condenser unit.

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

Detach Safe-NET I electrical wire harnesses.

The harnesses are located behind the SafeNET I controller. The power/relay harness on the left has an eight-slot connector. The sensor cable harness on the right has a four-slot connector. When re-installing, be sure to plug this harness in the bottom four-slot connection, not the top connection.

Next, detach the merchandiser’s electrical wire harness located on the right hand side near the coil. For Safe-NET III, detach the interface cable to the display.

Remove the two screws securing refrigeration unit cassette in place.

Use the center black bar to pull the refrigeration 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.

DANGER! – LOCK OUT / TAG OUT — To avoid serious injury or death from electrical shock, always disconnect the electrical power at the main disconnect when servicing or replacing any electrical component. This includes, but is not limited to, such items as doors, lights, fans, heaters, and thermostats.

Fluorescent lamps have a plastic shield.

When the lamp is replaced, keep the lamp shield to install over the new lamp.

The switch under the display lamp cover operates both the display lamp and interior lamps.

Sign off on the lamp replacement

The wash out drain is located behind the refrigeration cassette and can be cleaned with water and wiped with a soft cloth.

Ensure drain is unobstructed before replacing cassette.

The washout drain flows into an auxiliary waste line.

Next remove the auxiliary waste line cap to drain any excess water.

Upload a photo of the auxiliary waste line cap removed.

Place a dry towel over the line to absorb water.

Replace cap, cables and cassette.

Sign off on the drain cleaning procedure.

LTH merchandisers have interior case lamps.

The lamps are protected by a clear, plastic shield.

Remove the shield to replace lamp.

Wedge a small putty knife at the top rear of the lamp, then carefully loosen the shield from the side of the merchandiser.

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

Remove lamp shield and change out lamp.

Replace lamp shield at bottom corner bracket first.

Next, bow lamp shield and replace shield into top corner bracket.

Smooth shield to ensure a good replacement fit for the lamp shield.

This ballast operates the interior lamp.

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

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