Thermo Scientific Harris DLT Series

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. 

CAUTION: Avoid the excessive use of water around the control area due to the risk of electrical shock. Damage to the controls may also result.

The air filter should be cleaned a minimum of four times per year. 

1. Open the front door by grasping the handle.
2. Locate the grille on the door. Grasp the middle of the grille material and gently pull out to remove.
3. Wash the filter material using water and a mild detergent.
4. Dry by pressing between two towels.
5. Install the filter back into the grille and close the door. 

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 from Thermo. Order part number 398216 for 3 cu. ft. units, or 398217 for 13, 17, and 20 cu. ft. units.

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.
4. Open the lid and remove sub-lids. Place towels on the chamber floor.
5. Allow the frost to melt and become loose. Remove with a soft cloth.
6. After defrosting is complete, clean the interior with a non-chloride detergent. Rinse thoroughly with clean water and dry with a soft cloth.
7. Plug unit in and turn power switch on.
8. Turn the battery power switch to Standby mode.
9. Allow the freezer to operate empty overnight before reloading the product.

The condenser should be cleaned a minimum of once per year. 

1. Open the front door by grasping the handle.
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.

The lid gasket should be cleaned a minimum of once per month. Using a soft cloth, remove any frost build-up from the gasket, sub-lids, and lids. The clean gasket alarm occurs every three months as a reminder to remove frost build-up from the gasket and doors. Press the Silence key to mute the audible alarm. The lid gasket may need to be cleaned more frequently if dirt or excessive frost build-up prevents the door from closing properly.

All Models Except 3 cu ft

1. Open the front door by grasping the handle and pulling.
2. Locate the battery power switch. Turn the battery power switch to the Off position.
3. Remove the four screws holding the recorder bezel to gain access to the battery.
4. Remove the three nuts securing the battery bracket.
5. Remove the bracket and old battery. Discard properly. Install the new battery and secure.
6. Reconnect the battery (red to positive and black to negative).
7. Replace the recorder bezel.
8. Turn the battery power switch to Standby mode.
9. Close lower panel door.

3 cu ft Models

1. Open the front door by grasping the handle and pulling.
2. Locate the battery power switch.
3. Turn the battery power switch to the Off position.
4. Remove the two nuts securing the battery bracket.
5. Remove the bracket and old battery. Discard properly. Install the new battery and secure.
6. Reconnect the battery (red to positive and black to negative).
7. Replace the recorder bezel.
8. Turn the battery power switch to Standby mode.
9. Close lower panel door.

Note: For a consistent and dependable charge, replace the battery every 2 years. Replacement batteries must be rechargeable and are available from Thermo. Refer to the parts list for stock number an description of the replacement batteries. Dispose of the used batteries in a safe manner and in accordance with good environmental practices. 

Defrost the unit as previously described. This prepares the unit for storage. Turn Off the battery power switch. Turn Off the freezer power switch. 

Note: If the unit has been in service, turn it off and disconnect the power cord connector before proceeding with any maintenance.