Question about Heating & Cooling
Lets take a moment to see what exactly is inside the condenser (that's
an outside unit) You have a compressor, a fan, a contactor, a coil, and
a capacitor. How does it work? The condenser is connected to the house
via an electrical box called a yank out. It is a quick way to kill
power to the unit. Note: this is not the breaker to the unit. That
would be in the main panel by the meter. People always assume this is
the only safety. It is put there by law to kill the power to the unit
for service personel. Pull out the connection to kill the power before
checking the unit. The first thing to look for is a swolen capacitor
If it swells it fails and the unit don't function too well. The next
thing to look for is contactor problems. Their are small wires coming
from the inside control panel that power up the 24 volt coil that yanks
down the contactor. That coil might be bad. If it has no
continuity(open) it is in need of replacement. A critter could get
between the contacts and fry them as well. Look on the compressor for
burnt wires and loose connections (very common). The fan motor should
be very easy to turn so if it is stiff then it probably is in need of
lubrication. The standard oil in the HVAC world is Zoomoil. It is hi
temp resistant, will not lose viscosity and is non flammable. If a weed
eater should kill the thermstat wires going outside noting will work
because the contactor won't pull down. if the contactor coil is open
then it won't pull down and engage the compressor and fan. if a critter
crawled under the contacts nothing will happen. of course if the
compressor pins are shorted to the copper piping or there is a hole in
it or it has an open winding between pins it is shot.
If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61
Posted on Jul 01, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
Since the failure of an air conditioner to turn on, loss of air conditioner cooling capacity, reduced air conditioning output temperatures, loss of cool air supply, or even loss of air flow entirely can be due to a variety of problems with one or more components of an air conditioner or air conditioning system, after reviewing the lost air conditioner cooling diagnosis procedures described in this article, be sure to also review the diagnostic procedures at each of the individual air conditioning diagnosis and repair major topics listed just below. To return to our air conditioning and refrigeration home page go to AIR CONDITIONING & HEAT PUMP SYSTEMS.
Electrical problems on HVAC systems: Keep in mind that despite the depth of technical detail you will find here about all components of air conditioners and heat pumps, most service calls for non-working air conditioners or heat pumps turn up an electrical problem. So if your A/C system is just not working at all be sure to check all of our electrical and control setting suggestions first.
Mechanical problems on HVAC systems: tend to fall into these groups: refrigerant leaks, dirty condenser coil or unit, dirty evaporator or cooling coil, or burned out (or hard-starting) compressor motors. We have also seen a number of problems with fans and fan motors in both the compressor/condenser unit and in the air handler/blower fan unit. Some of those fan problems are mechanical - like a loose fan belt or blade. MORE DETAILS
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