The common form of defrosting commercial refrigeration system is conducted by electric heaters embedded into the evaporator coil. Refrigeration defrost heaters are simple, inexpensive, and easy to install.
Why do Freezers need Heaters?
Issues may arise due to icing problems. Icicles and frost could form and cause harm to people, products, and even to the freezer itself! When people are going in and out of the freezer and every time the door is opened there is change in the air. The air that is already in the freezer is cool and dry, but the air outside of the freezer is warm and moist. When the door is open, it permits the two air masses to collide forming a thin film of moisture that quickly freezes. The heater protects the interior of the refrigerator from the moisture.
When to Defrost?
For an example we will use an all-day restaurant (serves breakfast, lunch, and dinner) and the recommended use of a defroster would be four types a day. Prior to each meal is when the freezer will have high traffic to retrieve items for meal preparation. 6 a.m. for breakfast, 11 a.m. for lunch, and 5 p.m. for dinner. During each of this preps, defrost should take place to reduce frost and possible icing to occur. So, where is this fourth time slot at? A suggested time after closing or around midnight to ensure that any remaining ice to be cleared.
What Happens if Defrosting Occurs too much?
Icicles forming on the ceiling of the freezer above the unit cooler or around fan openings are because defrosting is occurring too much or too long of a cycle. If too many occur, if there is not a lot of frost, the defrost heater will melt it quickly and then the water will turn into steam. The steam will then rise and condense on any cold surface, more likely the ceiling and fan section of the freezer. If the heating cycle is too long, the same results could occur. Typical length of the cycle should be anywhere from 15-20 minutes depending on the size of the freezer.
Heatrex Defrost Heaters
Heatrex offers two types of defrost heaters that will meet defrosting requirement.
- Straight Length: Is used as an electric defrosting of coils and evaporator pans that may be clamped directly to the evaporator coils and operated by time clock or manual defrost controls. They may be formed into drain pans to prevent freezing of condensate. The molded terminals should be located above standing water.
- Cartridge Type: this an electric defrost heater designed to insert directly into holes provided in coil fins. It needs to be molded above any areas that standing water may occur.
Heatrex will provide you with high quality refrigeration defrost heaters for defrosting needs. Please contact a Heatrex representative today at (800) 394-6589 or visit our site http://www.heatrex.com/.