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Wetness from the air freezes onto the evaporator coils (the cooling coils in the freezer) and forms an insulating barrier to heat transfer. Airflow likewise reduces as the passages narrow due to ice buildup. Each evaporator has a defrost cycle to melt frost/ice that has developed on the evaporator coils.
Appropriate care needs to be taken whenever putting products inside of the chiller. If the chiller is overcrowded with things, or things remain in front of the evaporator fans, the flow of air will be decreased along with the efficiency of the refrigeration system.
A walk in cooler transfers heat from unit to the space around the condenser. Common temperature varieties are from 35 degrees Fahrenheit to 41 degrees. Below 35 degrees a forced defrost cycle is required to avoid freeze ups.
The number and period of defrost cycles differs and is a change that needs to be programmed during the system’s preliminary set up. Depending upon the area and application, regular compressor shut off periods for coolers might provide appropriate time to keep the evaporator coil clear of ice.
In the majority of applications, a timed or auto-defrost cycle is needed to keep the evaporator coil clear of ice. During the defrost cycle, the compressor is shut off and for electrical defrost systems, a little heater in the evaporator is then utilized to melt collected frost from the finned coil surface area. As the ice is melted from the coils, the resulting liquid water is captured in a drain pan and gotten rid of from the system via a condensate drain. A p-trap needs to be utilized on the drain line so that air can not enter the system. In addition, it is important to optimize the period of the defrost cycle so it completes once the ice has cleared the coils. If the defrost cycle runs too long, excess heat will be added to the box in the form of water vapor. This water vapor can condense on the ceiling and will freeze, producing pebbling of ice on the ceilings. In succeeding cycles, this moisture will leak down from the ceiling to the floor, leading to a dangerous, slippery frozen floor.
Some food products are more sensitive to cold temperatures than others, so the type of food you are storing along with the type of refrigeration system you are using will likewise affect the temperature you need to set. Foods that require being stored listed below 35 F will require a forced defrost cycle. Here are some basic standards for temperature ranges based upon the type of refrigeration system you have:
Reach-In Freezers +5 F to -10 F.
Walk-In Freezers 0 F to -10 F.
Ice Cream Freezers -10 F to -20.
Top Reasons your freezer isn’t freezing your food
Condenser Coils are Dirty
If the condenser coils are located within the freezer walls, the coils do not require cleansing. However, if the condenser coils can be readily accessed from behind or under the system, you need to clean them every 6-12 months. If the condenser coils are filthy, they won’t be able to dissipate heat successfully, significantly reducing the cooling capacity of the freezer. If the condenser coils are filthy or have not been cleaned in a while, clean them.
Compressor
The evaporator fan motor draws air over the evaporator coils and flows it throughout the freezer. If the evaporator fan motor is not working, the freezer will not cool. On the majority of fridges, the fan motor will not run when the door is open.
Start Relay
The start relay provides power to the compressor. If the start relay isn’t working properly, the compressor might run intermittently or might not perform at all. If the compressor won’t run, the freezer will not cool.
Put an old towel or something on the floor in front of the freezer, and for this part, you’ll require a hair dryer.
Put a bowlful of boiling water onto one of the empty racks ( after having gotten rid of any drawers and racks).
Now direct the blast from the hair dryer into the freezer, on its most popular setting, up until you begin hearing ice dropping everywhere.
Have a go at getting rid of any big lumps by cracking below the ice with a plastic scraper, preferably without damaging anything, then repeat the hair dryer process, and continue, replacing the boiling water as it cools.
Typically this process takes a number of hours to complete
To prevent so much ice forming, it helps if the freezer is kept full.
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