Maintenance; Care And Cleaning - Delfield 4400 series Installation & Operation Manual

Delfield

MAINTENANCE

CAUTION
The thermostat must be turned to OFF and the cabinet
disconnected from the power source whenever per-
forming service, maintenance functions or cleaning the
refrigerated area.
STAINLESS STEEL CARE AND
CLEANING
To prevent discoloration or rust on stainless steel several
important steps need to be taken. First, the properties
of stainless steel need to be understood. Stainless steel
contains 70-80% iron which will rust. It also contains
12-30% chromium which forms an invisible passive film
over the steels surface which acts as a shield against
corrosion. As long as the protective layer is intact, the
metal will not corrode and is still stainless. If the film is
broken or contaminated, outside elements can begin
to breakdown the steel and begin to form rust or other
discoloration.
CAUTION
NEVER USE STEEL PADS, WIRE BRUSHES OR
SCRAPERS!
Do not use an abrasive cleaner because it will scratch
the stainless steel and plastic and can damage gaskets.
Proper cleaning of stainless steel requires soft cloths or
plastic scouring pads.
Cleaning solutions need to be alkaline based or non-
chloride cleaners. Any cleaner containing chlorides will
damage the protective film of the stainless steel. Chlo-
rides are also commonly found in hard water, salts and
household and industrial cleaners. If cleaners containing
chlorides are used, be sure to rinse repeatedly and dry
thoroughly upon completion.
Routine cleaning of the interior and exterior can be done
with soap and warm water. Extreme stains or grease
should be cleaned with a non-abrasive cleaner and
plastic scrub pad. When cleaning the exterior, always rub
with the grain of the stainless steel to avoid marring the
finish. There are also stainless steel cleaners available
which can restore and preserve the finish of the steels
protective layer.
Early signs of stainless steel breakdown can consist of
small pits and cracks. If this has begun, clean thoroughly
and start to apply stainless steel cleaners in an attempt
to restore the passivity of the steel.
1
CAUTION
Never use an acid based cleaning solution! Many food
products have an acidic content which can deteriorate
the finish. Be sure to clean ALL food products from any
stainless steel surface. Common items include, toma-
toes, peppers and other vegetables.
CLEANING THE CONDENSER COIL
The condenser coil requires regular cleaning every 90
days (recommended). In some instances you may find
a large amount of debris and dust or grease accumu-
lated prior to the 90 day time frame. In these cases the
condenser coil should be cleaned every 30 days.
If the build up on the coil consists of only light dust and
debris the condenser coil can be cleaned with a simple
brush. Heavier dust build up may require a vacuum or even
compressed air to blow through the condenser coil.
If heavy grease is present there are de-greasing agents
available for refrigeration use, and specifically for the
condenser coils. The condenser coil may require us-
ing a de-greasing agent and then being blown through
with compressed air. Follow the de-greasing agent
manufacturer's instructions.
Failure to maintain a clean condenser coil can initially
cause high temperatures and excessive run times.
Continuous operation with dirty or clogged condenser
coils can result in compressor failure. Neglecting the
condenser coil cleaning procedures will void any warran-
ties associated with the compressor or cost to replace
the compressor.
CAUTION
Never use a high pressure water wash for this cleaning
procedure as water can damage the electrical compo-
nents located near or at the condenser coil.
In order to maintain proper refrigeration performance, the
condenser fins must be cleaned of dust, dirt and grease
regularly. It is recommended that this be done every
three months. If conditions are such that the condenser is
totally blocked in three months, the frequency of cleaning
should be increased. Clean the condenser with a vacuum
cleaner or stiff brush. If extremely dirty, a commercially
available condenser cleaner may be required.
If your freezer seems to vibrate excessively when the
compressor is running, loosen (but do not remove) the
bolts on the compressor. Semi-hermetic models should
be loosened before operating.