Delfield ST4427NP-6, Specifications, Installation, Operation & Maintenance Manual

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Part Number: 9295093A 02/21 23
Section 4 Maintenance
Quarterly Cleaning
If you notice water accumulation on the inside of the unit,
follow the instructions for cleaning the interior condensate
pan and exterior drain lines.
Note: This cleaning instruction applies to 4400 units produced
after July, 2020.
INTERIOR DRAIN LINES
The unit will have a drain located inside the unit that
removes the condensation from the evaporator coil and
routes it to an external condensate evaporator pan. The drain
pan and hose can be accessed through a louver on the
bottom interior of the cabinet as seen in following picture.
To clean the pan, remove the 5/16” screws from the
evaporator cover.
For larger units the center shelf racks do not need to be
removed. Using a soft bristle brush, like the ones in the
following pocture, clear the drain line and pan of any debris.
Be sure not to use sharp metal objects to clean stainless
surfaces , this may damage crucial protective surfaces.
Reinstall the evaporator cover and the 5/16” screws.
Continue to clean the drain lines from the exterior.
EXTERIOR DRAIN LINE
Each unit has a drain located behind the unit that removes
the condensation from the interior drain line tray into the
evaporator below the unit. Located behind the center panel
in the following image.
Behind this panel is a clear rubber hose inserted into a
copper 90° pipe, as shown below. This connection is behind
PermaGum, an insulator that must be preserved and
replaced after cleaning. Failure to properly replace the
PermaGum will result in a poorly functioning unit.
PermaGum
Pipe cleaning brushes can be found
locally near you.