The heat pump in my apartment is not working.
At the outside unit I can hear a slight hum and then it clicks then goes
quiet. It seems that a circuit breaker in the unit is tripping.
It doesn't appear/sound like the compressor is running and the fan isn't
Would a frozen compressor keep the fan from running?
I set it on cooling and it still didn't run.
I don't think that I would kill myself. I'm a licensed in the auto world
for Freon, I'm also a licensed A&P (aircraft mechanic) and an electrical
I'm trying to save the nice lady some money if I can repair her problem
for a reasonable cost.
If somebody wants to send me an email to point me in the right direction
or give me some pointers I promise I won't tell, lol.
Oh My! A licensed auto refrigerant tech, a licensed AP AND
.............you guessed it everyone.
He's also an EE!
Now to top it off you want to save some little old lady some money.
Do her a favor. If you REALLY care that much, LEAVE it the hell alone
and pay a tech to come out and fix it for her/you. Consider the money
a Christmas gift.
i bend over backwards to help aircraft owners to work on their own
airplanes. i give them data, tips and pointers on how to do things
right. These are my customers.
It's narrow minded people like you who try to keep the information to
themselves and pat themselves on the back for doing it.
I tried to ask for some simple information and I get shit for no reason.
I suspect that your pretty insecure otherwise you too would be trying to
pass on information you have learned through the years, and probably
from people far more experienced than you.
They should have laughed at you and put you down for asking for information.
Actually Nieve Dave;
Many a person do I teach *in my trade.* When it's someone who's [outside]
of my trade, who wants a [quick] answer to [save someone money,] it puts a
whole different spin on things. You want to learn the trade? Take a course
in HVACR pr two.
How wonderful it is that you help / pass on information to those in need for
aircraft repair and electrical work. But I am not you. And you shouldn't
insult Bubba's mom that way either. Keep your family names to yourself
As a matter of fact, your the "dick head." Why don't you just call you
neighborhood friendly HVAC tech and ask them to "share" the information?
You, Mr. Dick head may bend over whomever you wish backwards. I dont
swing that way. As far as Im still concerned you got the best
information given. Call a real hvac tech, pay for it yourself and tell
the old lady Merry Christmas.
There, now you got all that valuable info for free.
And if you think what you got was "shit" then you need to grow some
balls and take off those panties you sniffiling little toddler.
Most compressor have an overload trip built inside. But that would not
prevent the fan from running.
A 24vac signal powers a big relay that typically turns on both the fan and
the compressor. Both have starter capacitors or share one of those dual
starter capacitors. The compressor is 230 and the fan is usually 115.
There is also a reversing valve in the freon line that controls if it is in
ac mode or heat mode.
Plus there is usually a circuit board that periodically puts the unit into
defrost mode which is basically turning it back into an ac for a couple
minutes but without the fan. This heats up the outside coils pretty fast
and melts any accumulated ice. It could be sensor controlled but most are
just timer circuits.
In most of the world contactors are called relays. Beats me where the
name contactor came from? Usually it seems to only be used for higher
powered relays. If you showed an ee one I'd suspect he'd be more
likely to call it a relay.
I'll bet we won't see any of them some day. I've been getting 25amp
triacs for under a buck apiece lately. If it wasn't for the surge
current it's be easy to replace the contactor with a triac and
I am sorry James but some of us see it different
"In most of the world contactors are called relays."
Relays are normally open and or normally closed
and they come in single or multi contacts
usually max. rated amperage 15 amp.
the contactors are usually 15 amp. and up
and are normally open very rarely that are combination
but yes can be for special purpose combination NO&NC
but for general purpose Contactors are always normally open
and they start at 20 Amp. rating common for 2,3&4 poles
Note: Triacs or for resistive loads not bad I would not want them
on my equipment on inductive loads and I am talking from experience.
Yea, in the hvac world contactor is the norm. And it does more
commonly refer to the high amp situations. I was using terms the guy
was more likely to understand. He may or may not know what a
contactor is but if he has any electrical experience at all he does
know what a relay is.
I can't argue with you at the moment about the triacs for high current
inductive loads. But the ratings are continuing to climb and the
price drop. You might be able to use them now on smaller residential
units. Once they have ones that can handle the high inductive load
they will be way more reliable than the current mechanical devices.
Plus they are more easily used in conjunction with computer control
and I'm thinking that computer control is not far off in residential
hvac either. It's pretty easy to see how a cpu could manage
compressor, fans, expansion valves, etc all based on input from
sensors on the equipment, indoor, and outdoor environments.
The new equipment that I install has a mother board in condensers and heat
pumps with an on-board contacts that are pulled in or released when the
current sinewave is at its null to elimate contact arcing. The "advertised"
lifespan is supposed to be 100 times that of a regular contactor. Yes the
computer control is already there and has been for a couple of years.
Triacs are not the most reliable either for the application... and when they
fail, they do it with a loud noise and lots of smoke. Funny thing about that
factory smoke... once it escapes, its a real bitch go get it back in.... one
day they will invent a patch kit for that, same way they did for bicycle
Until there is a better solution than relays and/or contactors, or whatever
you want to call them today, that will work with high current, inductive
loads, I will stick with what the equipment comes with.
BTW... with all these ideas your coming up with, how come your not working
for the manufacturers R&D department trying to design a more efficient,
bulletproof, less expensive, heat pump or condensing unit??? Your an EE
right?? You can do anything cheaper than a pro can.....
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