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The Beet Envision Sentinel unit includes a NEMA 12 Rated Thermal Edge Air Condition Unit, this unit requires regular maintenance to maintain proper operation.

User Manual can be download here, if desired.

Preventative Maintenance

Preventative maintenance should be performed at least monthly. If environment is excessively dirty, bi-weekly maintenance may be required.

Air conditioners require regular cleaning of the condenser air inlet filter. Wash filter often if washable using proper cleaning compound and back flushing the dirt out, or replace if not washable whenever it appears physically dirty. Restriction to the flow of air over the condenser coil will degrade the performance of the equipment, cause it to overheat, reduce cooling and can damage the compressor. The overload switch in the compressor may cause the compressor to cycle if the condensing coil pressure becomes too high due to air restriction. A further safety feature is the refrigerant high pressure cut off switch which will stop the compressor if the condensing pressure becomes too high due restricted condenser air flow or some other cause.

Restricted air flow due to neglecting a dirty filter will cause unit to repeatedly turn off and then turn back on after it cools off. An operation in this safety cycling mode will eventually damage the equipment and void the warranty.

Refer to Field Serviceable Parts section in this manual for details on parts that can be changed to help increase the uninterruptable life of the Air Conditioner.

Air Filter Service

Remove the air conditioner filter and wash if washable or replace if not washable. Dry thoroughly before replacing. THERMAL EDGE Air Filter Treatment Spray in aerosol cans or spray bottle is recommended to enhance air filter efficiency. Replacement filters are readily available from THERMAL EDGE Customer Service. DO NOT operate the air conditioner without the air filter. Such operation will allow the condenser coil to become dirty and loose efficiency, causing overheating and diminished cooling capacity. Dirty condensing coils must be back-flush cleaned using proper commercial coil cleaning compounds and thorough back-flush rinsing. Refer to directions on the cleaning compounds selected. Acid wash is not recommended as it reduces the life of the coil.

Do not use solvents to clean the programmable thermostat. Wipe with mild soap and water.

Digital Temperature Controller Programming

For the end user this section will provide all the necessary information to view and change all functions and parameters available to you.

How to see the setpoint

  1. Press and immediately release the SET key. The display will show the setpoint value.
  2. Press and immediately release the SET key or wait for 15 seconds to display the enclosure temperature again.

How to change the setpoint

  1. Press the SET key for more than 2 seconds to change the setpoint value.
  2. The value of the setpoint will be displayed and the “F” LED starts blinking.
  3. To change the SET value, press the UP or DOWN arrow key within 15 seconds.
  4. To store the new setpoint value, press the SET key again or wait 15 seconds.


The set value is stored even when the procedure is exited by waiting for the time-out to expire.