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DEFROST
Defrost will occur 12 hours after switching the
disconnect switch to the ON position. Defrost
can be set to any time desired by switching the
unit off, then back on again, 12 hours before
the desired defrost time. "Df" is displayed on
the display during defrost. It will show the
discharge air temperature when the evaporator
coil has returned back to stabilized operating
temperature.
During defrost, the condensate pump will
pump defrost water to the condensate pan
located at the top of the merchandiser. On low
temperature cases, the fans shut off during
defrost, and electric defrost heaters energize to
melt the frost off the evaporator coil. Defrost
terminates when the evaporator coil reaches
approximately 48°F. On medium temperature
cases, the fans runs continuously, there are no
defrost heaters, and defrost is time-terminated
after 60 minutes.
CHECKLIST AFTER 12 HOUR RUN TIME
• Check case temperature.
• For water-cooled units, check the water
outlet temperature from each condensing
unit. Water outlet temperature should be less
than 10° above water inlet temperature.
• Verify that the fans are running. (The fans
will be off if the case is in a defrost cycle.
They will come back on after the completion
of this cycle.)
• Initiate a defrost cycle and ensure the heaters
are working properly. Check the amp draw
at the terminal block, located in the front
electrical raceway, just below the right most
door of the case.)
P/N 0520677_W
• Check the door operation again, to ensure
they close properly once the case is down to
operating temperature.
• Are all inspection plates and covers properly
replaced?
• Inspect for any water accumulation resulting
from incorrect or unsealed penetrations
where electrical or other lines pass through
the case insulated walls.
• Check that the lights come on when the light
switch is in the on position.
• Check that the condensate pump and
condensate fan turns on. Condensate pump
pumps water to the condensate pan during
defrost Check to ensure there are no leaks.
The pump will be on for only a few seconds.
If condensate pan does not energize, GFCI
may need to be reset.
• See the merchandiser's Data Sheet Set for
refrigerant settings and defrost requirements.
Bring merchandisers down to the operating
temperatures listed on the data sheet.
U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • WWW.HUSSMANN.COM
Do not store items or flammable
materials on top of the unit.
Do not walk on case.
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