Preventive Maintenance - Thermo Scientific 5900 Series User Manual

-86c ult upright freezer

Table of Contents

Section 4

Maintenance

Your equipment has been thoroughly tested and calibrated before shipment. Regular preventive maintenance is important to keep your

unit functioning properly. The operator should perform routine cleaning and maintenance on a regular basis. For maximum

performance and efficiency, it is recommended that the unit be checked and calibrated periodically by a qualified service technician.

The following is a condensed list of preventive maintenance requirements. See the specified section of the instruction manual for

further details.

We have qualified service technicians, using NIST traceable instruments, available in many areas. For more information on Preventive

Maintenance or Extended Warranties, please contact the Technical Services Department. Cleaning and calibration adjustment intervals

are dependent upon use, environmental conditions and accuracy required.

Tips:

•

Fill an upright by starting at the bottom near the probe and add racks to one shelf at a time. Allow freezer to recover to set point

between shelves.

•

Fill a chest by starting at the left side near the probe. Filling with room temperature racks will result in a long pull-down time.

•

Fill unit with frozen product to help overall performance; frozen water jugs, for example.

•

Always make certain the vacuum relief port is free of frost and ice, to allow for timely re-entry into the freezer after a door

opening.

Action

Verify ambient temperature, <90°F

* Adjust door handle for firm latching, as needed

Check and clean probe cover, gaskets, hinges and lid(s) of ice and snow. See

Figure 1-4 for probe location. See Section 4, Clean Door Gasket.

Check air filter. Clean or replace as needed. See Section 4, Clean Air Filter.

Check alarm back-up battery. See Section 1, Connect Unit to Electrical Power

and Section 4, Replace Battery(s).

Check condenser fan motor for unusual motor noise or vibration.

* Verify and document calibration, at the minimum, annually. See Section 2,

Calibrate.

* Clean condenser compartment and wipe off condenser. See Section 4, Clean

Condenser.

Recommended Maintenance *Back-up System - inject test & battery. See

Section 5.

To minimize ice build-up inside of freezer:

•

Locate the freezer away from drafts or heating/cooling vents

•

Keep the number of door openings to a minimum

•

Minimize the length of time door is open

•

Make sure door latches securely after opening

4-6

Model 900 and 5900 Series