BELIMED WD230 Manual

Washer Disinfector
Service Training Seminar
Belimed US Charleston, SC

• Manual doors in stainless steel or with glass door
• Pass trough model or one door model
• Microprocessor controlled
• Electronic water level control during filling process
depending of chamber loading (reduce water
consumption)
WD 230

• Automatic vertical glass door
– Door opens down
• Use the same rack as the 230.
WD 250

WD 290
•15-tray washer-disinfector with
automatic glass sliding doors

Accessories instrument racks

Course objectives
Discuss cleaning theory
Describe a basic wash program
Understand the fluid flow paths
Interpret electrical schematics
Identify key components
Identify normal menus
Access service mode
Troubleshoot fault codes and errors
Review maintenance procedures

Law of mass cleaning action
The law of mass cleaning action expresses a relationship between time,
action, concentration, and temperature in the process of removing soils.
This laws states that if you decrease any one of these factors, we must
increase one or more of the remaining factors in order to maintain equal
cleaning ability

4 key factors for cleaning efficacy
Chemicals

Chemistry - soil
To properly clean something you need an understanding of the soil
Inorganic Soils
Water spots, lime
scale, rust,
corrosion, oxidation,
minerals, rocks
USE ACID
CLEANERS
Combination Soils
Mixtures of organic
plus inorganic soils
USE
COMBINATION
CLEANERS
Organic Soils
animal fats, body
oils, carbohydrates,
proteins, bacteria,
mold, yeast, slime
USE ALKALINE
CLEANERS

Chemistry - pH
pH – This is a measure of the
concentration of hydrogen ions
(H+) in relation to the
concentration of hydroxyl ions
(OH-)

Chemistry – cleaning power
pH is a very important part of cleaning
power.
The reality is many hospitals choose to
use pH neutral products. These products
contain some of the following to perform
the cleaning task:
Solvents
Surfactants
Enzymes
Chelating agents

Chemistry - solvents
Solvent
All cleaners require some sort of
liquid solvent. This solvent not only
"dissolves" the soil, but also provides
a medium in which soil can be
suspended and carried away from
the surface.
Water is the oldest, least expensive
and most widely used cleaning
solvent known to man. In time, water
will clean or remove just about every
type of soil, be it organic, inorganic,
petroleum or combination.

Chemistry - surfactants
Surfactant: sur·fac·tant
a.k.a - detergents or soaps
The word surfactant is short for "surface active
agent". Surfactants work at the boundary layer (the
interface) between the soil and the solvent. Each
surfactant molecule has two chemical groups; one
that is attracted to water (the hydrophile) and one
that is attracted to soil (the hydrophobe).
http://en.wikipedia.org/wiki/Surfactant
http://en.wikipedia.org/wiki/Detergent

Chemistry – Enzymes
Protease (enzymes)
Proteases can either break
specific peptide bonds
(limited proteolysis),
depending on the amino acid
sequence of a protein, or
break down a complete
peptide to amino acids
(unlimited proteolysis). The
activity can be a destructive
change, abolishing a
protein's function or digesting
it to its principal components.

Chemistry - Enzymes
For example coagulated blood protein: fibrine-network is
degraded to smaller parts that can be removed easlily
There are an endless number of different enzymes
with different properties (different target molecules,
pH, temperature, stability etc.)

Chemistry- chelating agents
Chelating agents (che-lating)
"tie up" the hardness in water. Dissolved
minerals in water are the cause of hardness.
Rain and distilled water is pure and soft, but
it quickly dissolves minerals (mainly calcium,
magnesium, iron and silica) as it soaks into
the ground and travels through rivers or
lakes. As the water becomes loaded with
dissolved minerals, it becomes hard.
Hardness in water will hinder the cleaning
ability of a cleaning solution. This is because
the detergents and other active ingredients in
the cleaner see the hardness minerals as
"soil". These actives are used up by the
hardness, and are not available to clean the
soil we want them to.

Basic wash program – pre-wash
Step 1 - Pre-wash ~ 2 min
The maximum allowed temperature is 45C for all
Pre-wash steps.
Cold water will help prevent coagulation of blood
onto the device.
If the water temperature increases to above
45C error code 163 “Water too warm” will be
flashed and the process is interrupted.
Since ~ 2009
S109 repeat option is available.
In the event that excessive foam
is detected in the unit during prewash,
the unit will halt the process drain
the washer and begin again.

Basic wash program - wash
Step 2 - Wash ~ 5 min
Warm Water is mixed with the cleaning
agent or detergent.
If the water temperature increases
by more than 8C error code 163
“Water too warm” will be flashed
and the process is interrupted. You
can set temperature to 0C to
prevent error code.
If there is excessive foaming in the load
the unit will abort. Foam inhibits the
units ability to clean instrumentation –
Action from the law of mass cleaning

TOSI testing

Basic wash program - rinse
Step 3 - Rinse ~ 1 min
Warm Water is used to rinse off the
cleaning agent or detergent.
The length and number of rinse repeat
steps will be determined by the
detergent products rinse ability.