It is common to setup freezers for 2 (dry) to 6 (Humid) defrosts per 24hr period depending on the climate and how they are being used. Refrigerator temperature is controlled by a fresh food compartment thermostat that is used to open and close an air damper in the top left wall of the refrigerator. As far as the system is concerned, the same thing is happening here that was happening before when we used a cold control or a low-pressure switch. This mode maintains a fixed temperature setting for loads that spoil under the smallest difference in temperature. Don’t Forget to Report Any Irregularities or Alarms. They aren’t running. A thermistor changes resistance based on the temperature it is exposed to. I had no idea they got that hot. If I’m troubleshooting a particularly difficult system, I’ll first clear all ice from the coil, then disable defrost overnight and return in the morning to ensure that I have the right conditions to test the defrost. This will likely cause a flooded start at the end of each defrost when the liquid refrigerant rushes into the compressor on startup. But why can’t we just use temperature or time alone? Then reset the alarm using the “buzzer off” button, cursors and function change keys. However, you’ll have to keep the engine and reefer unit running at all times to keep the current temperature setting. It depends on the design of the refrig. With this time only strategy you are left guessing and in order to prevent progressive freeze ups you will always need to defrost a little too long. A shorter suction line will result in a faster temperature drop while more frost on the coil will result in a slower but deeper dip in temperature before it starts back up. Let’s “follow the gas” and try to visualize what’s happening during this defrost. When putting this thing through its paces, I couldn't get the defrost heater to kick on after advancing the timer to defrost. You’ll sometimes hear it called a “constant cut in” control. This is the other half of the DTFD control. Quick, accurate flaring equipped with high-performance, large capacity lithium battery, adjustable speed control and quick-connect, it makes flaring easy and enjoyable, while guaranteeing accurate and consistent flaring. A discharge differential won’t work for Kool gas. If your load can tolerate 5-10 degree fluctuations from your set temperature, then your auto start-stop mode is the best way to go. Don't worry about the heater's temp, just know that it'll burn you if you touch it. The most basic defrost is one we all probably remember Granny taking everything out of the “icebox,” unplugging it and going after it with a screwdriver, hair dryer or an ice pick. As a trucker, it’s important to know how to set up your trailer’s refrigerator unit right for your cargo. From a technicians standpoint its important that you fully understand the defrost strategy being used and that you fully test the defrost cycle after you make any changes. Driving Safe: The Good, The Bad and The Newbies. The evaporator coil cannot go above 32ºF so long as there is still ice in that area, so it stands to reason that if heaters are running on the coil and the coil is still at 32ºF or lower then there is still ice. The number 3 and number 8 thermostats are especially important for refrigeration system builders. As with any complex system, there are multiple points of failure. Similarly, if the solenoid valve that opens to allow defrost gas into the suction fails to completely open, we won’t have enough flow. One that stops flow from the suction line into the compressors and one that directs gas into the suction line and back towards the evaporator. So what if we used time alone? If you are used to simple, straight cool split systems you know that the low voltage to the outdoor unit is usually VERY simple with just a Y (contactor power) and a C (common) connected to the outdoor unit in many cases. $55.94 $ 55. 1. Don't run the defrost heating element for very long, the plastic in most refriges melts fairly fast and the heater its self hardly ever runs more than 30 minutes at a time and never really glows more than red. Let’s talk for a minute about how long a defrost needs to last… obviously, until the coil is completely clear of frost and ice, but we need to know when that is…. Defrost Thermostat Parts. Venom Pack Condenser Cleaner is a high foaming pure concentrate liquid designed to tackle the toughest soils. Let’s start with the basics and move on from there. Let’s take a deeper dive into the magic that is gas defrost.. FAQs | Repair Videos | Academy | Newsletter | Contact, By With this type of system, you set the cut in of the control to a saturation pressure equal to the same 37°F to 40°F, remembering this is saturation temp, not air temp, and adjust the cut out to maintain the temperature desired. Now, we can set that timer up to shut the refrigeration off at regular intervals for a specific period. Let’s take a look at how this adds some complexity to the defrost control system. I ran the compressor for about 20 minutes to try to get the t-stat cold enough to close, but either that wasn't enough time to get it cold enough to close or the bi-metal is stuck open. One drawback to hot gas defrost is the expansion and contraction of refrigerant lines due to temperature swings can be extreme if the lines run far enough. If your fail safe time is 30 minutes this means that once a defrost cycle begins the LONGEST it will remain in defrost in 30 minutes regardless of the defrost termination thermostat. This topic is now archived and is closed to further replies. Save more with Subscribe & Save. The simplest way to add this heat is usually with an electric heater. This is often set to 30º or lower before the fan can come back on. Now, I’ll connect a thermometer to the line that bypasses the TEV at the evaporator and allow that to stabilize. The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips. coils are still frozen over. The systems where this is more common aren’t single system but multiplex systems with multiple evaporators operating on different schedules. Always report alarm codes. You can also take the temperature on the line leaving the evaporator or really anywhere along the liquid line that is dedicated 100% to that circuit.
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