HVAC Cooling: Air Conditioner Sequence of Operation

Air Conditioner Sequence of OperationAir Conditioner Sequence of Operation - When a technician is troubleshooting a problem with any piece of equipment it is important that the technician understands the sequence of operation for that equipment. When there is a problem with the equipment, including air conditioners, the technician will know the problem if the equipment or air conditioner does not follow the sequence of operation. Sometimes it is that easy and other times it is not that easy when troubleshooting equipment. However, it is important to understand the sequence of operation for an air conditioner so the technician can troubleshoot the air conditioner system.

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Evaporator Coil for Heat Pumps & Air Conditioners | HVAC Refrigeration

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. Continue reading

Refrigeration Pressure Switches | HVAC Systems

 Refrigeration pressure switches -

Refrigeration Cycle Component Diagram for Air Conditioners and Heat Pumps

Refrigeration Pressure Switches | HVAC Systems

Richard – What are pressure switches used for in refrigeration circuits and how do pressure switches protect the system from further damage?

Refrigeration Pressure Switches

Thanks for the question and for being a reader of High Performance HVAC! First there two types of basic refrigeration switches in the typical high grade residential system. I say high grade because not every refrigeration system in air conditioners and heat pumps have switches to protect the refrigeration system. Continue reading

2011 Proposed Increase in SEER – EER – AFUE – HSPF

10 SEER units cannot be purchased in the US any longer. The new standard as mandated by the Department of Energy as of January 2006 is 13 SEER. This 30 percent increase in efficiency from 10 SEER requires a change out of the inside coil. In 2011 the Senate is proposing a new SEER and AFUE standard that will be based on where you reside in the USA. The country will be split up into three regions. Northern, Southern, and the Southwestern regions with each region having different efficiency standards. The proposed efficiency standards for each region are as follows: Continue reading

Compressor Rebuild | HVAC Heating and Cooling Refrigeration

Refrigeration - HVAC Compressor Rebuild

Rebuilt Reciprocating Compressor

Compressor Rebuild - This freshly rebuilt reciprocating compressor is destined for a large commercial chiller. Chillers chill water for air conditioning. Compressors compress refrigerant vapor and pump the compressed refrigerant to the condenser to be condensed into a liquid. The compressor provides compression which is an integral part of the refrigeration process. The old compressor was condemned for electrical burn out. The windings in the old one burned up and caused the circuit breaker to trip. Continue reading