Heat Pump Sequence of Operation - Every electrical-mechanical piece of equipment has a sequence of operation. While some manufacturers of heat pumps vary slightly with their heat pump sequence of operation the overall sequence of operation for a heat pump is the same for most manufacturers. So unless you have a special type of heat pump (they are out there – the Acadia heat pump is designed for extreme cold weather temperatures up North like Canada) the sequence of operation for your heating equipment should be very similar to what is described here. This is the basic operation of a heat pump like you will find in conventional heat pumps. (more…)
Semi-Hermetic HVAC Compressor Rebuild Shop - These old semi-hermetic HVAC compressors are destined for the rebuild shop where they will see new life one day in a chiller or DX air conditioning system. If a business loses a compressor for whatever reason (usual burnout) they have the option of ordering a new compressor from the factory or calling a rebuild shop to see if they have a rebuilt reciprocating compressor that will replace the old one, or rebuild the bad compressor. This leaves the business the option of finding the best value or cost for replacing the compressor. These are semi-hermetic reciprocating compressors and can be torn down and rebuilt completely nearly like new ones. (more…)
HVAC reciprocating compressors were the workhorse of the HVAC industry and when someone mentioned a compressor the first thing one thought about was a reciprocating compressor. This compressor has a piston(s) that compresses vapor and in the cases of an HVAC compressor, the compressor compresses the refrigerant vapor. (more…)
Scroll Compressors - One of the workhorses for heat pumps and air conditioners is the scroll compressor. The scroll compressor works as many other compressors do as far as the refrigeration process is concerned. The scroll compresses the refrigerant thereby raising its pressure and temperature. The compressor does its job by making cool refrigerant and turning it into hot refrigerant changing both the temperature and the pressure. Since the late 90′s, the scroll has taken off and has nearly replaced the reciprocating compressor in the average air conditioner and heat pump system. Two-stage scroll compressors have replaced using two reciprocating compressors in an air conditioner or heat pump condenser that is high efficiency.
HVAC Refrigeration Evacuation | Technical Refrigeration - Why is it necessary to evacuate a refrigeration system before charging it with refrigerant? Because all systems are designed to operate without moisture or non-condensable gas in the system. If your air conditioner or heat pump was installed without a proper evacuation the system it will not function as designed and will likely fail prematurely. (more…)
The TXV or Thermostatic Expansion Valve is preferred over other refrigeration metering devices because it only allows a specified amount of refrigerant to flow based on demand. Any type of refrigeration metering device creates a pressure drop in the refrigerant and with a pressure drop of the refrigerant a temperature drop also occurs.
This temperature is necessary to drop the refrigerant down to temperature lower than ambient temperatures inside the structure being cooled. This allows the refrigerant to absorb the heat contained in the air passing over the evaporator coil. (more…)
Heat Pump Types - There are different types of heat pumps available on the market today. A heat pump is an air conditioning unit that cools when the temperature is hot and heats when it is cold. There are many different types of these heat pump systems available. There is the geothermal heat pump. It can either utilize a series of closed-loop water pipes buried in the ground or other methods of heat exchange. This process removes or absorbs heat for heating and cooling.
Air source heat pumps can be configured differently. One type of air source heating will utilize electric heating for backup heating while another may use a gas furnace for backup heating. These types of systems can also be split systems or package units and nearly all share a similar heat pump sequence of operation. A description of the various types of systems and how they work is below in this article on heat pump types. These systems utilize similar heat pump components but differ in how the heat pump works.
HVAC Tip - Having the proper humidity levels in your home or business is important not only for your health but also the amount of energy your HVAC systems use to keep you comfortable. If the humidity level is high in the summer you will not feel comfortable. If the humidity level is low in the winter you will not feel warm when the thermostat is set for an average temperature. This will result in turning the thermostat up to compensate and you will use more energy to stay comfortable. A properly designed and installed HVAC system will keep the proper levels of humidity in your home or business and save you money in energy costs by reducing the amount you use the HVAC system. For more information on humidity and maintaining the proper levels of humidity in your home please visit our humidity technical pages.
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HVAC reciprocating compressors were the workhorse of the HVAC industry and when someone mentioned a compressor the first thing one thought about was a reciprocating compressor. This compressor has a piston(s) that compresses vapor and in the cases of an HVAC compressor, the compressor compresses the refrigerant vapor. 
Scroll Compressors - One of the workhorses for heat pumps and air conditioners is the scroll compressor. The scroll compressor works as many other compressors do as far as the refrigeration process is concerned. The scroll compresses the refrigerant thereby raising its pressure and temperature. The compressor does its job by making cool refrigerant and turning it into hot refrigerant changing both the temperature and the pressure. Since the late 90′s, the scroll has taken off and has nearly replaced the reciprocating compressor in the average air conditioner and heat pump system. 
