Category Archives: Refrigeration

HVAC Triple Evacuation | Heating & Cooling Refrigeration


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. 


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Compressor Overheating Troubleshooting | Air Conditioner Repair


Compressor Overheating Troubleshooting | Air Conditioner Repair

Compressor Overheating Troubleshooting | Air Conditioner Repair – There are some problems with an Air Conditioning Service and Repair – HVAC Cooling or Heat Pumps | HVAC Heating and Cooling that can be avoided with proper maintenance. Other problems result in a mechanical or electrical problem with the systems that needs to be resolved. Compressor overheating is a serious 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 effective cooling or heating but if the temperature inside the compressor rises too much then the oil in the compressor can break down and reduce the lubrication and cooling effect the oil has inside the compressor. 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 and other a lack of lubricating and cooling effects it becomes like an acid. This eats away at the windings and will cause compressor failure.


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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.


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Refrigeration Piping Design & Installation Practices


Refrigeration Piping Design & Installation Practices

Refrigeration Piping Design & Installation Practices

Protection of Refrigerant Piping in Wall Penetration is is Essential

Refrigeration Piping Design – 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


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Two-Stage Scroll Compressors | Refrigeration & Cooling


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.


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WEDNESDAY, June 03, 2015

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HVAC Tips: Helping You Learn

Carbon monoxide detectors are important to own for those people who burn fossil fuels for heat. Carbon monoxide is a flammable, colorless, odorless, tasteless toxic gas produced during incomplete combustion of fuel - Natural Gas, Oil, Coal, Wood, Kerosene, etc. Someone suffering from carbon monoxide poisoning generally has severe headaches, nausea, and sinus problems. These symptoms generally begin with mild effects and people usually remain unaware of what the exact problems are until, sometimes, it is too late. How many cracked heat exchangers or faulty furnaces are out there that no one knows anything about except a slight headache and nausea? Don't take any chances, get your carbon monoxide detector and call your local heating and air conditioning company for a heater inspection today. Read more on this subject on the Furnace Page.

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