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ISLA FOOD COUNTERS IM-FR / IM-FH / IM-FS 1020
U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
9. Troubleshooting Guide (Cold Case)
Problem
Possible Cause
Possible Solution
Case temperature is
too warm.
Ambient conditions may
be affecting the case
operation.
Check case position in store. Is the case located near an
open door, window, electric fan or air conditioning vent that
may cause air currents? Case must be located minimum
15 Ft away from doors or windows. Cases are designed to
operate at 55% Relative humidity and a temperature of 75°F.
Discharge air temp is out
of spec.
Check evaporator fan operation. Check electrical connections
and input voltage.
Fans are installed backwards. Check airflow direction.
Fan blades are installed incorrectly. Make sure fan blades
have correct pitch and are per specification.
Check to see that fan plenum is installed correctly. It should
not have any gaps.
Check suction pressure and insure that it meets factory
specifications.
Place pre-packaged hot food in case.
Check t-stat or DA setting if controlled at the rack to ensure it
is set to the data sheet.
Case is in defrost.
Check defrost settings. See Technical Specifications section.
Product load may be over
its limits blocking airflow.
Redistribute product so it does not exceed load level. There
is a sticker on the inside of the case indicating what the
maximum load line is.
Coil is freezing over.
Ensure defrost schedule is set to spec. and that the cut in and
out settings are properly set to spec.
Ensure proper superheat is set to 5-7°F.
Ensure that the evap fans are working and blowing air across
the evap coil.
Refrigerated drop in (RDI) do not use load limit tape. Ensure
product is kept below the discharge air wall opening at top
and that the return air wall in front is not blocked.
Return air is blocked, make sure debris is not blocking the
intake section.
Coil close-offs are not installed. Inspect coil to make sure
these parts are on the case.
Condensing coil or
evaporator coil is clogged
or dirty.
Clean coil.
Large gap is visible
on bottom of front
glass or glass can't be
opened because it is
too low.
Glass Height adjusters
need to be adjusted.
See Glass Adjustment section.
Large gaps are visible
in between glass
panels or glass rubs
against end panel.
Glass/glass clamp
assembly needs to be
adjusted.
See Glass Adjustment section.
Front glass does not
stay open and falls
closed.
Glass shock/piston may
need to be replaced.
Case should be serviced by a qualified service technician.
