Welbilt Delfield 4000P Series, Installation, Operation And Maintenance Manual

16 

Part Number: 9294045C  03/22

Maintenance 

Section 4

Interior Cleaning

The interior can be cleaned using soap and warm water. If 

this isn’t sufficient, try ammonia and water or a nonabrasive 

liquid cleaner. 

PREVENTING BLOWER COIL CORROSION

To help prevent corrosion of the blower coil, store all acidic 

items, such as pickles and tomatoes, in seal-able containers. 

Immediately wipe up all spills. 

Exterior Cleaning

,

Caution

Never use an acid based cleaning solution on exterior 

panels! Many food products have an acidic content, 

which can deteriorate the finish. Be sure to clean the 

stainless steel surfaces of ALL food products.

Clean the area around the unit as often as necessary to 

maintain cleanliness and efficient operation.
Wipe gasket and surfaces with a damp cloth rinsed in water 

to remove dust and dirt from the outside of the unit. Always 

rub with the “grain” of the stainless steel to avoid marring 

the finish. If a greasy residue persists, use a damp cloth 

rinsed in a mild dish soap and water solution. Wipe dry with 

a clean, soft cloth.
Never use steel wool or abrasive pads for cleaning. Never 

use chlorinated, citrus based or abrasive cleaners.
Stainless steel exterior panels have a clear coating that 

is stain resistant and easy to clean. Products containing 

abrasives will damage the coating and scratch the panels. 

Daily cleaning may be followed by an application of 

stainless steel cleaner which will eliminate water spotting 

and fingerprints. Early signs of stainless steel breakdown 

are small pits and cracks. If this has begun, clean thoroughly 

and start to apply stainless steel cleaners in attempt to 

restore the steel.
Wipe casters with a damp cloth monthly to prevent 

corrosion.

DRAIN

Each unit has a drain located inside the unit that removes 

the condensation from the evaporator coil and routes it 

to an external condensate evaporator pan. Each drain can 

become loose or disconnected during normal use. If you 

notice water accumulation on the inside of the unit, be sure 

the drain tube is connected to the evaporator drain pan. 

If water is collecting underneath the unit, make sure the 

end of the drain tube is in the condensate evaporator. The 

leveling of the unit is important as the units are designed to 

drain properly when level. Be sure all drain lines are free of 

obstructions.

Cleaning 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 monthly. If 

conditions are such that the condenser is totally blocked 

in a month, 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.
Failure to maintain a clean condenser coil can initially cause 

high temperatures and excessive run times. Continuous 

operation with a dirty or clogged condenser coil can 

result in compressor failure. Neglecting the condenser coil 

cleaning procedures will void any warranties associated 

with the compressor and cost to replace the compressor.

Doors/Hinges

Over time and with heavy-use doors, the hinges may 

become loose. If this happens, tighten the screws that 

mount the hinge brackets to the frame of the unit. Loose 

or sagging doors can cause the hinges to pull out of the 

frame, which may damage both the doors and the hinges. 

In some cases this may require qualified service agents or 

maintenance personnel to perform repairs.

Door Adjustment

If the door needs lowering at the handle, use a 5/16” (8mm)

wrench to loosen the hinge screws and install a spacer 

outside of the hinge. Tighten the screws.

Illustration 1:

spacer outside

Illustration 2:

spacer inside

If the door needs to be higher at the handle, use a 5/16” 

(8mm) wrench to loosen the hinge screws and install a 

spacer inside of the hinge. Tighten the screws.

Illustration 1:

spacer outside

Illustration 2:

spacer inside