Question about Heating & Cooling
Hi I am having a problem with a main fan overload alarm on this 30 ton crac unit,i did not look into the problem that much (didnt have time) but now that i think about it i did not see a reset button on the Contactor, all i know is that i am not getting 24 volts to the Contctor,transformer is fine have power on it but like i said didnt go any further with the troubleshooting.it is my first encounter of this sort,Please if you can help it will be greatly appreciated.. Thanks in Advance Pete
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Posted on Jan 02, 2017
well it has blown the fuse on the transformer, then you have coil switch bad.It could be the coil on the contath in for cooling.But can check by taking the yellow wire a loose and see if the don't blow. The red wire is one side of the transformer and the com could be any color.But look at the red wire because it is the main wire that travel the voltage throuhg the unit.
Posted on Mar 26, 2009
Are you getting 24 volts at the contactor coil? If not check your control voltage wiring to the unit. If all is good check refrigerant charge, you will need gauges for this, compressor can be held out due to low pressure, also unit can be out by the high pressure safety switch which is normally reset manually.
Posted on Jul 14, 2009
SOURCE: Blown Transformer heat pump
blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you
Posted on Jul 26, 2009
Hello, check the tstat wiring going to the unit for any breaks in or if it has come loose between the indoor unit and outdoor unit. Also, chevk if you are getting voltage from tje control board between the y and c terminal, if not the control board is bad. Last thing to check is remove tstat and jump the y and r wires there if this starts the unit then you have a bad tstat.
Posted on Apr 30, 2011
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