I just did startup on three Trane split HPs with low ambient kits. I was
in because the tech who was there doing it said his compressor was "surging". I
there and get a few things fixed up and started the check out (outside ambient
below 70 degrees F). The condenser fan is cycling on and off, 3 seconds on, 3
off, which basically is causing the fan to speed up and slow down continually.
thought to myself, "Now that's different" and got out the installers guide and
enough that's how it's supposed to work. OK, is it just me or does this sound
bad idea? I am a big fan of Trane equipment but this has got to be hard on the
motor and the relay(s) involved.
Ive never seen a compressor "surge" in all my days yet. He sounds like
Condenser fan on and off 3 seconds at a time. You cant read or you've
been smoking something. Point me to what/where you read so I can see
I don't smoke but I will drink on occasion.
This was 7 am and I read it in black and white in the installer's guide (at
twice). I'll get a copy of it and post it. I wouldn't shit you guys... :)
It's just the way it is designed, no kidding.
Another thing I thought was odd is that these HPs have a filter/dryer
6 inches from the compressor on the discharge line. I was taught not to do
What's going on??? Was there a meeting I didn't get invited to, where these
were thought up???
Yeah I'll have to do that, just saw one through the grille and then checked
couple of others and they all had them and the welds looked pretty bad for a
install. I am curious now and will have to go back by and find out.
Stop reading in the dark at 7am without your glasses on. :-)
I think someone just showed us that they are not too "worthy" with
that last statement you made. :-)
And YES, I would love for you to post me those install instruction
about the 3 sec on , 3 sec off being correct operation.
It's like swimming upstream, just treading water will put you out to sea...
It used to be fun going to all the tech meetings the vendors used to
These days they have just about dropped all pretense of them being any more than
a sales pitch. Last few I attended there were only a few techs there. The
either went away or the techs just got tired of the sales pitches, hard to tell.
of the most "effective training" I received, as a young tech, was the free night
the vendors put on. The old Techs that I could talk to at these meetings are
made the difference for me, and they knew their stuff too. It was a confidence
builder to be able to teach the Boss and the rest of the guys the right way to
things. Didn't hurt when it came time for raises either.
Finally got the installer's guide to the low ambient kit. Part #
Consists of a control module, oa sensor and Liquid line temperature sensor. It
to be a simple head pressure control that cycles the fan to maintain a liquid
temp set point. You use the high side charging chart to determine the set
looks like the cycling rate of the fan is controlled by the module. It says it
down to zero degrees F ambient temp.
The fan will only cycle when the ambient temp is below 70 degrees F.
said about cycle rates and what the minimum or max rates are, however, there is
switch that puts the condenser fan into a cycling rate of 3 seconds on/3 seconds
with a call for cooling. The cycling rate appears to be what ever it takes to
the liquid line set point. When I watched the condensers they were not in test
and the condenser fan was cycling at a 3 on/3 off pace (three units).
Couldn't find the tech manuals online but the kit is on eBay for sale...
(never got back to check the mufflers)
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