The condensing unit fanis responsible for pulling air through coils of the condensing unit. They pull air through the condensing unit coils. It runs the gamut in horsepower ratings from low fractional horsepower in small residential units all the way up to 1 horsepower (and larger) 3 phase motors in large commercial HVAC units. It is usually direct drive to a propeller blade which creates the air flow. Its job it to move air. A specific quantity of air through the condensing unit coils so that a heat exchange process can take place and rig the condensing unit of the heat it absorbed indoors or in the case of the heat pump in heating mode to absorb heat from the outside air and send it inside. It is the process of refrigeration and all the components work together to achieve one result and that is to move heat from one place to another.
In straight air conditioners the air conditioner fan is used mainly in the summer or when the air conditioner is running. During the winter this fan sits idle until the air conditioner is turned back on in the spring when temperatures begin to rise.This can be a problem for the air conditioner motor. Sitting all winter without any motion the bearings and shaft in the air conditioner motor can seize up or rust. It is important that the air conditioner motor be checked to ensure it is running especially when it is first turned on after sitting idle all winter. This is a good reason to have air conditioning spring maintenance performed by a professional.
Thermostat Wire Colors Code - Always follow the thermostat manufacturers instructions whenever changing the thermostat. Always turn the power off at the air handler and the condenser and make sure there is no voltage at the transformer before proceeding. The colors below are the most likely colors used for most installations however your thermostat wire colors may be different than what is indicated here. There is no official standard for thermostat wire colors. Thermostat wiring colors are not standardized but these are the most wiring methods used based on my years of experience in the HVAC field where I successfully wired a lot of thermostats. For instructions on how to wire a thermostat please see our how to wire a thermostat page.
Air Conditioning Units & Heat Pumps Condensing Unit Basics
Air Conditioning & Heat Pump condensing unit is a simple yet technical piece of HVAC equipment. It sits out in the back (or side) of your house and kicks on and off almost by itself. At least it seems that way to most people. In this box made of sheet metal, is the heart of your HVAC cooling system. Or for those with heat pumps, it is the heart of your HVAC heating and cooling.
A heat pump condensing unit will look similar to an air conditioning condenser. There are differences inside the the heat pump condenser and air conditioning condenser equipment. A heat pump condenser has a reversing valve and an air conditioner condenser does not have a reversing valve. A heat pump will provide heating and cooling and an air conditioner will only cool your home or business. Both systems are common in the fact that both types of condensers have condenser coils, a compressor, controls, and a condenser fan motor. Unless you have a water to air heat pump system you probably do not have a heat pump if you live North of the Mid-Atlantic region (North of Maryland).
Every electrical-mechanical piece of equipment has a sequence of operation and while some manufacturers of heat pumps vary slightly with their heat pump sequence of operation but overall the 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 I described here. This is the basic operation of a heatpump like you will find in conventional heatpumps.
Heat Pumps are very popular especially in the South where air source heat pumps are mostly favored over straight air conditioners with a gas furnace for heating. With a heat pump one system can do it all especially in the mild winters of the South. In the North some people rely on a geothermal heat pump system or a water source heat pump where the heat is extracted from the ground instead of the air like an air source heat pump works. While air source heat pumps are cheaper to install the geothermal heat pump systems will save a lot of money over the life of the heat pump in operating costs so as far as efficiency is concerned the geothermal heat pump rules the day. There may be a time when your heat pump will begin giving you problems so we decided to post an article to help some people diagnose the heat pump problem in an effort to better understand the system. Some minor repairs can be done by someone with advanced do it yourself skills however we always recommend you call an HVAC contractor to repair the heat pump problem if you have a problem with your heat pump. Before you get started you may want to take a look at the articles, “How Heat Pumps Work” , “Heat Pump Components” and “heat pump sequence of operation“. To solve heat pump problems you at least need to be familiar with a heat pump and the heat pump components so those two pages will help you.