Section 4 - Maintenance
4.1 Cleaning the Cabinet Exterior
Wipe down the freezer exterior using soap and water and
a general use laboratory disinfectant. Rinse thoroughly with
clean water and dry with a soft cloth.
4.2 Cleaning the Air Filter (minimum of four times a
year)
1. Open the front lower door by grasping the bottom left
corner.
2. Locate the grille on the door. See Figure 1-5. Grasp the
middle of the grille material and gently pull out to
remove.
3. Wash the filter material using water and a mild deter-
gent.
4. Dry by pressing between two towels.
5. Install the filter back into the grille and attach the grille.
Depending upon environmental conditions, the filter may need
to be cleaned or replaced more frequently. If the filter becomes
torn or excessively dirty, a replacement can be purchased. See
the exploded parts list, Section 7, for filter part number. A filter
kit (set of 5) is also available.
4.3 Cleaning the Condenser (minimum yearly)
1. Open the front lower door by grasping the bottom left
corner. See Figure 1-5.
2. Using a vacuum cleaner, exercising care to not damage
the condenser fins, clean the condenser.
Depending upon environmental conditions, the condenser may
need to be cleaned more frequently.
a. Cleaning the Water-cooled Condenser
The water-cooled condenser can be cleaned-in-place by
using the CIP procedure. Cleaning solutions can be used,
depending on type of deposits or build-up to be removed.
Do not use liquids that are corrosive to stainless
steel or the brazing material (copper or nickel).
CIP (Clean-In-Place) Procedure
1. Disconnect the unit from the water supply.
2. Drain the unit.
3. Rinse with fresh water and drain the unit again.
4. Fill with fresh water.
5. Add cleaning agent (solution and concentration depend-
ent on deposits or build-up).
6. Circulate cleaning solution (if feasible).
7. Drain the cleaning solution.
8. Add and circulate a passivating liquid for corrosion
inhibition of plate surfaces.
9. Drain this liquid.
10. Rinse with fresh water and drain.
11. Reconnect the water supply and fill the unit.
12. Return to service.
4.4 Defrosting the Chamber
1. Remove all product and place it in another freezer.
2. Turn the unit off and disconnect it from the power
source.
3. Turn off the battery switch (see figure 5-1).
4. Open all of the doors and place towels on the chamber
floor.
5. Allow the frost to melt and become loose.
6. Remove the frost with a soft cloth.
7. After defrosting is complete, clean the interior with a
non-chloride detergent. Rinse thoroughly with clean
water and dry with a soft cloth.
8. Plug unit in and turn power switch on.
9. Turn the battery power switch to the on position.
10. Allow the freezer to operate empty overnight before
reloading the product.
Model 900 Series ______________________________________________________________________Maintenance
4 - 1
Avoid the excessive use of water
around the control area due to the risk
of electrical shock. Damage to the con-
trols may also result.
Summary of Contents for 900 Series
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