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Posted by on July 13, 2007, 7:24 pm
>> It sound like your circulation fan kicking out on thermal overload
>> cause? few different things, one perhaps all it needs some lubrication
>> or running cap shorted or your voltage to low or it simply wants
>> take vacation be prepare to purchase new one.
>> Tony
>>
>>
>>
>> > Recently my HVAC in my condo stopped working. The fan will not come
>> > on. Even when I click the tstat to have the fan "on" instead of
>> > "auto".
>>
>> > There is a switch for the blower/fan that is next to the intake vent
>> > (and where the fan actually is) that I turn off to service the filter,
>> > and if I turn this switch to off, then to on, the fan will whirr up
>> > and stay on for about 10 seconds. During this time, the air does feel
>> > cool (to me) but after about 10 seconds, the blower turns off again
>> > for no apparent reason.
>>
>> > I have checked the breaker and it is OK.
>>
>> > The blower is made by first co. and the model is 30RAQT-3.
>>
>> > Any thoughts?
>
>I was able to check the relay inside the outside unit (which has the
>fan and compressor). I found the following.
>
>-The side coming from the switch out there has 110V.
>-The other side does not.
>-If I leave all power down and push down on the contactor, it fires up
>the compressor and as long as I hold it, it runs and seems to run ok
>(only tried this once because I didn't want to start/stop the
>compressor over and over).
>
>I'm trying to measure the voltage that turns on the relay but I
>haven't seen any voltage there so I'm not 100% sure it's the relay.
>I'm not sure how the tstat works?
>
>Of the 4 wires I have, W,Y,G, and RC, as the system sits right now,
>there is no voltage on any of them. If I flip off the indoor blower
>switch, then turn it back on, I get voltage between the W and G
>lines. I haven't been able to check if there is voltage outside at
>the relay during this because I don't have another person here right
>now to help me check. It appears as if the RC and W lines are the
>ones that connect to the relay, though. I haven't been able to read
>any voltage on these lines yet.
>
>I'm wondering two things:
>
>1. Does blower/fan "check" to see if the outside unit is working and
>shut down after 10 seconds or so if it is not?
>2. How does the whole system work, ie, how does the tstat control
>it? It looks like it is just a bunch of relays and does not provide
>any actual power? What provides the power? The blower/fan circuit
>that provides the voltage on the W and G lines when it turns on? Is
>the RC supposed to have voltage between it and another line? Does
>this sound like a relay problem? I'm in the process of finding places
>locally to replace the relay as I it looks like it will be cheap to
>try it anyway.
>
>Any thoughts?
You are well on your way to spending more on wrong parts than
you would paying to get it fixed right.
Carry on.
--
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