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START UP / OPERATION
4-4
DEFROST
Defrost will occur 24 hours after switching the
disconnect switch to the ON position, then
back on again 24 hours before the desired
defrost time. Defrost can be set to any time
desired by switching the unit off, then back on
again, 24 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.
CONTROL SETTINGS AND OPERATION
These instructions are written for normal
frozen food, ice cream, or medium temperature
application, and provide optimum settings
for normal store conditions. There is also a
chart that shows low temp. and medium temp.
Freedom settings.
Do not store items or flammable
materials on top of the unit.
Do not walk on case.
P/N 0539221_T
CHECKLIST AFTER 12 HOUR RUN TIME
• Check case 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. See the controller
instructions for how to force a defrost cycle.
Check the amp draw at the terminal block,
located in the front electrical raceway, just
below the right most door of the case.
• 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 pan turns on by pouring a gallon
of water into the drain. Condensate pump
pumps water to the condensate pan during
defrost. Check to ensure there are no leaks. If
pump or condensing 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
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