Delfield NDF-18 Installation Manual download pdf (Page 7)

Milk, Ice Cream & Milk & Ice Cream Dispensers Service and Installation Manual

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Maintenance

Door Gasket Maintenance

Door gaskets require regular cleaning to prevent mold and mildew build up

and also to retain the elasticity of the gasket. Gasket cleaning can be done

with the use of warm soapy water. Avoid full strength cleaning products

on gaskets as this can cause them to become brittle and crack. Never

use sharp tools or knives to scrape or clean the gasket. Gaskets can be

easily replaced and do not require the use of tools or an authorized service

person. The gaskets are “Dart” style and can be pulled out of the groove in

the door and new gaskets can be “pressed” back into place.

Drain Maintenance - Base

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 in the machine compartment. 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.

Caster Maintenance

Wipe casters with a damp cloth monthly to prevent corrosion.

The power switch must be turned to OFF and the unit

disconnected from the power source whenever performing

service, maintenance functions or cleaning the refrigerated

area.

Refrigerators and Freezers

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

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

When cleaning the exterior, always rub with the “grain” of the stainless

steel to avoid marring the ﬁnish. Do not use an abrasive cleaner because

it will scratch the stainless steel and can damage the breaker strips and

gaskets.

Stainless Steel Care and Cleaning

To prevent discoloration or rust on stainless steel several important

steps need to be taken. First, we need to understand the properties of

stainless steel. 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 is still stainless. If the ﬁlm is

broken or contaminated, outside elements can begin to breakdown the

steel and begin to form discoloration of rust. Proper cleaning of stainless

steel requires soft cloths or plastic scouring pads.

NEVER USE STEEL PADS, WIRE BRUSHES OR SCRAPERS!

Cleaning solutions need to be alkaline based or non-chloride cleaners.

Any cleaner containing chlorides will damage the protective ﬁlm of the

stainless steel. Chlorides 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. Routine cleaning of

stainless steel can be done with soap and water. Extreme stains or grease

should be cleaned with a non-abrasive cleaner and plastic scrub pad.

Always rub with the grain of the steel. There are stainless steel cleaners

available which can restore and preserve the ﬁnish of the steels protective

layer. 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 passivity of the steel.

Never use an acid based cleaning solution! Many food

products have an acidic content, which can deteriorate the

ﬁnish. Be sure to clean the stainless steel surfaces of ALL

food products. Common items include, tomatoes, peppers

and other vegetables.

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 at least 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.

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.

Never use a high-pressure water wash for this cleaning

procedure as water can damage the electrical components

located near or at the condenser coil.

Preventing blower coil corrosion

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

as pickles and tomatoes, in sealable containers. Immediately wipe up all

spills.

Cleaning the condensate evaporator (remote models only)

The stainless steel condensate evaporator pan should be cleaned every

six months. Use a vacuum cleaner or damp cloth to remove dust that may

have accumulated. This will prevent corrosion of the stainless steel.

Defrosting

Milk or Ice Cream dispensers require defrosting after 3/8” to 1/2” of frost

forming. On/Off switch is located above the louver panel.

Never use sharp objects or tools to clean or scrape ice/frost build up. A

puncture could cause irreparable damage to the refrigeration system.

Cleaning the NLFAC milk dispensers

The following special instructions apply to the model NLFAC dispenser

only. After cleaning the interior and exterior as described above, be sure

to return the milk case loading tray to the bottom of the unit. The load tray

is required not only for easy self-locating of milk cases, but it also ensures

proper air flow through the evaporator coil for the air curtain.

Any restriction to the air flow path, including leaving the

milk case load tray out of the cabinet, will result in the

voiding of your warranties.

A drain is supplied to simplify cleaning of the interior. Open the clamp

used to close off the drain tube. Drain accumulated liquid from the

cabinet. Be sure to re-clamp the tubing before resuming operation of the

NLFAC unit.

Air Diffuser Cleaning Procedure

The air diffuser is located on the inside wall by the evaporator fans. Remove

the air diffuser from the equipment. Soak in fresh hot dishwater for five

minutes. Rinse by spraying soap off with warm water, directing the spray

into the holes. Repeat rinsing steps until material is visibly clean. Soak in

sanitizing solution for five minutes. Replace into equipment.

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Delfield NDF-18 Installation Manual Page 7

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