10
Operating Procedures
Model 20
Step 6
Add approximately 1 -- 4 liters of saline or an
appropriate solution to the removable basin.
(
Example:
electrolyte solution and any required
membrane preservatives or chemical additives). To
improve freezing time, this solution should be
pre--cooled to 4
_
C (40
_
F) before adding it to the
removable basin.
Figure 4
Step 7
When ice begins to form (approximately 15 minutes),
begin scraping and stirring the solution. A
polycarbonate scraper is supplied with the unit and
may be gas or steam sterilized. Continue stirring the
solution until the slush is ready for use. Constant
scraping will improve freezing time. If the unit is left
unattended for prolonged periods, the slush could
freeze to the sides of the basin. If this should occur,
scrape and stir the solution until it returns to a soft
slush consistency.
Figure 5
Step 8
As the slush is used, it can be replaced with an equal
volume of pre--cooled solution.
Step 9
Once the slush is no longer required, place the control
switch in the “OFF” position. Remove the basin for
cleaning.
Step 10
To drain the insulated evaporator, place a collection
pan under the right rear corner of the unit, directly
below the copper drain tube.
Using a screwdriver, loosen the drain plug in the center
of the insulated evaporator until all transfer solution
has been drained. Tighten the drain plug.
IMPORTANT:
It is assumed that all operating rooms
are under strict clean and sterile conditions. However,
even under the best of conditions, there will always be
the threat of minute airborne particles of lint and dust.
The Model 20 uses a small fan, fan blade and
condenser for the removal of heat from the refrigerant.
Air travels through the rear louver, across a condenser,
and is blown out the sides and the front of the unit. This
small amount of air movement allows lint and dust to
travel into the machine to collect on the condenser. If
the condenser is not cleaned, a sufficient amount of
dust may break loose and escape out the sides and
front of the machine. In addition, a dirty condenser will
reduce the unit’s refrigeration capabilities to produce
slush in a sufficient amount of time.
Therefore, routine maintenance must be performed.
The rear panel must be removed and the condenser
and inside of the machine must be vacuumed. Use a
soft brush to clean the condenser.
Figure 6
The intervals at which this job is performed are dictated
by hospital standards and by how often the Model 20
is operated. It is suggested that the machine be
inspected after each use.
When cleaning the condenser, use caution
with the sharp metal fins. Failure to comply may result
in personal injury.
