Question about Carrier Heating & Cooling
Arrier AC/Heating Unit Model LDT/HDT/50 CD 005 4 Nominal Ton Cooling are there filters to be replaced? how often to require PM
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Posted on Jan 02, 2017
SOURCE: Carrier air handler tonnage?
That is a fairly large difference. It is usually ok to have the inside evap. coil and blower up to 1 ton larger than the outside condenser. That will make the unit slightly more efficient as well as less likely to freeze up on low airflow situations. It is not recommended to install a new condenser on an old evap coil. There has been a lot of changes to the design of the coils in the last little while. For example a 10 year old 2 ton coil may only have 3 cubic feet of volume but a new 2 ton coil may have 4 cubit feet of volume.
There are many factors that may have infulenced the decision on what size condenser to install. Many of which can only be done by visiting the home and doing alot of work, checking the duct sizing bioth supply and return, inspecting the insulation and windows of the home etc. etc. Most of the time that never gets done. You can blame the contractor for not doing a complete check, but at the same time you can blame the customer because many contractors that are that good loose the job to a cheaper bid that did not no any of the research. It is a catch 22 for everyone involved.
There is ALOT more to sizing equipment that many people think, sadly that also includes many HVAC contractors. Way too many people use "rule of thumbs" or flat out "guess".
Sorry for the rant but your queston can only be answered by a good well educated HVAC contractor visiting your home. That type of a contractor is getting hard to find these days in such a price competetive world.
Posted on Oct 14, 2008
open the service panel to check for control voltage of 24volts when tstat calling, The contactor should be pulled in, if contactor is down,and contacts appear to be clean, and the unit is still not running, it is a bad compressor. to test this unplug the black wire from the compressoror at contactor,w/ power off! Turn on power if fan works normally it's a bad compressor. However if you see a swollen split cap(5 wires to a soup can looking w/ the terminal C,F,and Comp), switch it first and start at square one.
You also need to consider the high pressure switch if its cycling on off on off.
Posted on Mar 12, 2009
If the upstairs is working and the down stairs is not,You only need to have one unit checked,Don't assume it just needs puron(If it does,You have a leak,which cost more to locate and repair than some other likely causes)This is not something you can do yourself and is illegal if you are not EPA certified.to get a fair price would depend on your geographic location and the best way would be to call around to some local heating and air companies and ask how much a service call is.(That only tells you the price for them to came and see what the problem is,They will not be able to quote a price until they know what must be done to make the repairs.
I hope this has answered all your questions.
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Posted on May 16, 2009
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