How Much Refrigerant for the Air Conditioner 5/5 (2)

How Much Refrigerant for the Air Conditioner How Much Refrigerant for the Air Conditioner Question: What amount of Freon would it take to service a unit that services a 1200 square foot residential house if it were completely depleted? How Much Refrigerant for the Air Conditioner Answer: We get questions like this a lot in our … Read more…

HVAC Triple Evacuation | Heating & Cooling Refrigeration 5/5 (2)

HVAC Triple Evacuation

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.HVAC Triple Evacuation 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. 

Read more…

Please rate this

Compressor Overheating Troubleshooting | Air Conditioner Repair 5/5 (3)

Compressor Overheating Troubleshooting | Air Conditioner Repair

What you will learn from Compressor Overheating Troubleshooting article:
1) Avoiding the problem of compressor over-heating
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

Compressor Overheating Troubleshooting | Air Conditioner Repair – There are some problems with air conditioner or heat pump compressors that can be avoided with proper maintenance. Other problems result in a mechanical or electrical problem with the systems that need to be resolved. Compressor overheating is an issue that can cause serious problems with your air conditioner or heat pump system. Compressor Overheating Troubleshooting - Diagnosis and RepairA compressor that overheats can still operate and provide cooling or heating but if the temperature inside the compressor rises too high then the oil in the compressor can break down and reduce the lubrication and cooling effect the oil has inside the compressor for proper and necessary lubrication. This leads to possible mechanical failure and other problems that will occur to the compressor and in the refrigeration system that results from compressor overheating. When the oil becomes overheated it changes chemically. Through a lack of lubricating and cooling it becomes like an acid when the oil overheats. This eats away at the windings and will cause compressor failure.

Read more…

Please rate this

Evaporator Coils Dirty and Ice On Air Conditioner 5/5 (3)

Evaporator Coils Dirty and Ice On Air Conditioner

Dirty Evaporator Coils and Ice on Air Conditioner
Dirty Evaporator Coils

Evaporator Coils Dirty and 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 secretary 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.

We have many other related articles. Please use the search feature to the right to help you find other related articles.

Read more…

Please rate this

Refrigeration Piping Design & Installation Practices 5/5 (2)

Refrigeration Piping Design & Installation Practices

Refrigeration Piping Design & Installation Practices
Protection of Refrigerant Piping in Wall Penetration is is Essential

Refrigeration Piping Design & 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.

Refrigeration Piping Design – Residential Installation Factors and Considerations

In residential installations two or three skilled HVAC technicians usually handle the complete installation except for running line voltage from a breaker panel to the air handler and the outdoor unit. By code that requires an electrician and an electrical permit (In many municipalities however code requirements vary). It is important that all the work be done correctly according to code and best industry practices following basic fundamentals. This is very important in many regards including correct installation, the finished job looking professional, and the reliability of the system for its operating life. This requires a skilled knowledgeable technician that can wear many different hats to get the job done right.

Refrigeration Piping Design & Installation Practices

Read more…

Please rate this

Two-Stage Scroll Compressors | Refrigeration & Cooling 5/5 (2)

Two-Stage Scroll Compressors
Scroll Compressor Inside the Condenser

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. The HVAC controls would were often complicated and the equipment was difficult to troubleshoot when there was an air conditioner problem. There were all sorts of ways to accomplish staging including one manufacturer that would sell one whole unit that was actually two condensing units manufactured as one piece of equipment. The air handler for that condenser has a dual slab coil for each stage of the air conditioner. A two stage cooling thermostat would kick the second compressor when the demand called for additional cooling. Then new technology became available that changed how staging was done for higher efficiency models.

Read more…

Please rate this

What is a Metering Device – Refrigeration Components 4.67/5 (3)

What is a Metering Device – Refrigeration Components

What you will learn from What is a Metering Device:
1) We will answer the question, “What is a metering device” by defining the various types of HVAC equipment that use different types of metering devices and why.
2) How the metering device is involved in the refrigeration cycle
3) A comprehensive list of metering devices defining the metering devices commonly used in HVAC
4) Lots of resource and related links to help you learn more about metering devices.

What is a Metering Device - TXV- Thermostatic Expansion Valve
TXV Metering Device for a Heat Pump

Depending on the type of HVAC air conditioning or heat pump system it is and the efficiency range of the system will depend on the type of metering device the system has installed by the HVAC manufacturer of the air conditioner or heat pump system. Lower efficiency HVAC air conditioner and heat pump models have fixed orifice types while higher efficiency systems have thermostatic expansion valves installed in the HVAC air conditioner or heat pump system. The thermostatic expansion valve is far more complex than the fixed orifice metering device as the thermostatic expansion valve metering device modulates the refrigerant flow based on the temperature of the refrigerant temperature in the evaporator coil. This allows a specific amount of refrigerant, based on demand, to be metered into the evaporator coil while the fixed orifice metering device allows the same amount of refrigerant to enter the enter the coil no matter the conditions or the demand. As the liquid refrigerant enters the metering device it changes temperature and pressure. A partial amount of the liquid refrigerant flashes into a refrigerant gas or vapor as it leaves the metering device and enters the evaporator coil.

Read more…

Please rate this

Evaporator Coil for Heat Pumps & Air Conditioners | HVAC Refrigeration 5/5 (2)

Evaporator Coil for Heat Pumps & Air Conditioners

Old Evaporator Coil in a Rooftop Air ConditionerEvaporator 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.

Read more…

Please rate this

The Condenser for Air Conditioners and Heat Pumps| HVAC Refrigeration 5/5 (2)

The Condenser for Air Conditioners and Heat Pumps - Trane Heat Pump Condenser
Trane Heat Pump Condenser

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.

Read more…

Please rate this

The Compressor | HVAC Refrigeration 5/5 (1)

The Compressor | HVAC Refrigeration

The Compressor in an HVAC refrigeration system
Compressor in an HVAC refrigeration system

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.

Read more…

Please rate this