Advanced Instruments 4250 User Manual

The Advanced
®
Model 3250/4250 Service Manual
35
The cooling assembly should be cleaned once
every two months to insure optimal perform-
ance.
To flush the system:
1. Open the door and remove the heat trans-
fer fluid bottle.
2. Empty the contents and fill the bottle
halfway with a solution of 1:5 bleach in
distilled water.
3. Replace the bottle and insert only the tube
with the filter (A). Completely immerse
the filter in the fluid.
4. Insert the return tube (B) into another
container.
5. If there is a Supervisor/Operator
keyswitch, turn it to the Supervisor posi-
tion.
6. Press TEST to enter the test menu. Press
< or > to select "Head Up Down Test"
and press START.
7. Insert an empty sample tube into the
freezing chamber and press START.
8. Run this test for 10-15 minutes and then
press STOP.
Note: Using the manual primer pump to
complement the head pumping action
can help reduce the time required to
flush the system.
9. Remove the bottle with the diluted bleach
and install a new bottle of heat transfer
fluid. Insert only the tube with the filter
(A).
10. Press START twice. Run this test until
the colored fluid begins draining out of
the return tube, and then press STOP.
11. Remove the return tube from the contain-
er and insert it into the heat transfer fluid
bottle. Do not immerse the return tube in
the heat transfer fluid (B).
12 Press STOP to exit the menu.
To drain the system:
1. Turn off the power and unplug the instru-
ment. Remove the cover.
2. Remove the heat transfer fluid bottle and
empty the contents.
3. Replace the empty bottle and insert the
tubes.
4. Press gently on the pump at the bottom of
the head. Slide until all liquid has been
expelled (the unit may need to be tipped
on its side to remove the liquid).
Cleaning and Maintenance
B
A

Advanced Instruments 4250 Specifications

General

Brand	Advanced Instruments
Model	4250
Category	Medical Equipment
Language	English