Refrigerant R-410A Pressure Temperature Chart - R410A is an HFC and is commonly used in residential and light commercial HVAC equipment for air conditioners and heat pump systems. It widely replaces HCFC R-22 which was mandated by the Montreal Protocol to be phased out of production and use by 2020. R-410A differs a lot from R-22 in both chemical makeup and the tools needed to measure the pressures of R-410A. Since R-410A operates at higher pressure and a different type of oil is used than R-22 separate gauges should be used to obtain pressures. Cross contamination of the oils can cause serious issues between the two types of systems and it is highly recommended to use separate gauges for service providers. (more…)
HVAC Triple Evacuation - There is definitely some confusion among HVAC/R technicians about the proper methods of evacuation before introducing the refrigerant to the refrigeration circuit. Let me be clear from the start that my methods of evacuating a refrigeration circuit are based on experience, education and an official guide produced by the US Military and their specifications and proper procedures for evacuating a refrigeration system.
It is the proper procedure on any US Navy ship or support ship that a refrigeration system that has been open to the environment be triple evacuated before the refrigerant is reintroduced to the refrigeration circuit. The purpose is to prevent future problems because of contaminants including moisture in the system. (more…)
Compressor Overheating Troubleshooting | Air Conditioner Repair
What you will learn from Compressor Overheating Troubleshooting article:
1) Avoiding the problem of compressor overheating
2) how does compressor overheating effect the refrigeration system?
3) diagnosing compressor overheating
4) repairing the problem of compressor overheating and future prevention
5) lots of related links to help you learn
Evaporator Coils Dirty Ice On Air Conditioner – It was a very hot day and I got a ticket to respond to a call for no cooling. The customer said there was ice on the air conditioner. The heating and cooling service operator instructed the customer to turn the AC off so the ice could thaw before I got there to figure out the problem. It needs to be thawed before any AC troubleshooting can occur. There are two main causes why the evaporator coil will freeze and cause ice on the air conditioner. One is decreased or no air flow and the other is a low refrigerant charge.
Proper Refrigeration Piping Installation Practices – Installing a new air conditioning and heating system requires skill and knowledge of proper procedures in electrical wiring, controls wiring, and pipe work. On commercial projects a skilled electrician handles the electrical hook ups, a controls technician handles the control wiring, and a pipe fitter handles the pipe work including the refrigeration piping which can include chilled water and refrigeration pipe work. (more…)
Two-Stage Scroll Compressors
Two-Stage Scroll Compressors - For many years HVAC manufacturers used two compressors in their higher efficiency equipment to stage the air conditioner or heat pump for added efficiency. They would use a small compressor for the lighter loads or demands and then when the air conditioner or heat pump needed more demand the small compressor would shut down and the larger compressor would kick on to satisfy the demand. (more…)
- We will answer the question, “What is a metering device”. We will define the various types of metering devices and how they work.
- How the metering device is involved in the refrigeration cycle
- A comprehensive list of metering devices defining the metering devices commonly used in HVAC
- Lots of resource and related links to help you learn more about metering devices.
Evaporator Coil for Heat Pumps & Air Conditioners
Evaporator Coil for Heat Pumps & Air Conditioners – the evaporator is responsible for absorbing heat into the coils and the refrigerant. The evaporator is an essential component of vapor compression refrigeration. This is usually done as result of passing air or water over the evaporator coil where a heat exchange process takes place. Heat leaves the air or water (whatever medium is used) and is absorbed into the coil and the liquid refrigerant. As more and more heat is absorbed by the evaporator coil and the refrigerant again changes state from a liquid to a refrigerant vapor. By the time the refrigerant leaves the evaporator coil the refrigerant should be all vapor and ready to be received again by the refrigeration compressor. (more…)
The Condenser for Air Conditioners and Heat Pumps
The condenser coil receives the high pressure high temperature refrigerant vapor from the compressor and immediately begins to remove heat from the refrigerant vapor. As the refrigerant vapor makes its way through the condenser coil more and more heat is removed and the refrigerant vapor changes state from a refrigerant vapor to a refrigerant liquid. While the liquid refrigerant changes temperatures from a higher temperature to a slightly lower temperature the pressure remains constant. As the refrigerant vapor leaves the condenser coil it makes it way to the metering device. (more…)
The Compressor | HVAC Refrigeration
In a typical HVAC air conditioner or heat pump there are four major components that make the process of refrigeration work. Basically, this is how air conditioners work. And how heat pumps work. The first component in the process is a compressor or the heart of any air conditioner or heat pump system.
The Compressor | HVAC Refrigeration - How it Works
HVAC Refrigeration Compressor - A compressor receives the refrigerant vapor from the evaporator coil and compresses the refrigerant vapor. The vapor enters the refrigeration compressor at a low pressure and a low temperature and leaves the refrigeration compressor at a higher temperature and a higher pressure. The lower temperature refrigerant vapor is responsible for providing cooling for the refrigeration compressor and it also carries with it a small amount of oil which migrates from the compressor throughout the system. After the refrigerant vapor is compressed it is discharged to the condenser coil. A compressor is an essential component in the vapor compression process of refrigeration. (more…)