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22.08.2013
AIR CONDITIONER COMPONENT PARTS - CONTENTS: What are the indoor and outdoor components of an air conditioning or heat pump system?. This article lists and explains the function of the basic components of an air conditioning or heat pump systems and provides detailed inspection, diagnostic, and repair advice. Example home inspection report language is provided to describe common air conditioning system components and their defects. If your air conditioning or heat pump system has lost its cooling capacity or won't start see REPAIR GUIDE for AIR CONDITIONERS. See How to determine the cooling capacity of air conditioning equipment if the system seems to be working but is inadequate to cool your building. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution. The air conditioning system (and heat pump) components introduced here are discussed in detail and are illustrated by photographs and drawings throughout this website using the links at the left of these pages. We explain how to inspect, diagnose, repair, or select, purchase, and install air conditioning systems or their individual parts and components. Condensate system: water, or condensate is produced when we cool warm moist air by blowing it over the evaporator coil.
EVAPORATOR COIL or COOLING COIL (also called the "cooling coil" is connected to high pressure and low pressure (suction) refrigerant lines. Return Plenum, connected to return duct system, is the air receiving compartment which provides air to the blower fan. Supply plenum connected to supply duct system, is the air collecting compartment to which building supply ducts are connected. Air Filters located at the return duct air inlets, at one or more central return air inlets, or at the air handler unit itself are used to remove dust and debris from building air. Return air ducts and registers collect warm moist air from the occupied space and return it to the air handler unit.


Thermostat(s) are used to turn the air conditioning on and off and to set the desired indoor temperature. These components are discussed in detail and are illustrated by photographs and drawings throughout this website using the links at the left of these pages. Condensing coil receives high pressure refrigerant gas from the compressor and cools this refrigerant gas back to a liquid state. Electrical controls: shut-off switch(es) for service at the unit are provided to permit maintenance and repair of the equipment.
Service valves or ports are usually present on the refrigeration lines near the compressor.
I suspect that power fluctuations are more of a worry for controlling circuit boards in general.
High side pressure is on the compressor outlet side and low side pressure is on the compressor suction side. Question: We began having a problem with the unit blowing hot air and going outside to the unit finding the fan not working but after hitting a red button the unit came on and functioned properly. Rick: residential HVAC compressor motors are typically a sealed unit that cannot be field-repaired. I would investigate the squealing first - look for a failing blower assembly, belt, or in a split system, more likely a motor.
Questions & answers or comments about the components that are found on heat pumps and air conditioners. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Complete List of Air Conditioning & Heat Pump Design, Inspection, Repair Books at the InspectAPedia Bookstore. The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors.


I have been cautioned to stay clear of variable-speed blower options and their sophisticated electronic controls for lack of durability. While your surmise sounds sensible, in fact across thousands of readers and comments, I have not seen a particular pattern indicating that variable speed blowers fail more frequently than their simpler single speed units.
On the outlet side of the AC or heat pump compressor the refrigerant is at high pressure (over 100 psi) while on the suction side the refrigerant pressures are quite low.
There is also a squealing sound when the unit turns on and a lot of noise in the cabinet where the A-coils are when the unit is turned off. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Indeed for systems providing both heating and cooling we generally want a blower capable of operating at at least two different speeds for the two different modes. Another tech came out and claimed the system had excess frion, the high pressure side was at 280 and suction was 75 on the compressor. Being extreamly hot outside, perhaps causing either the fan motor to kick the system off or a pressure swithch.
Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order.



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