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Posted by Joseph on November 30, 2007, 11:51 pm
> wrote:
>
>>Guys,
>>
>> I just did startup on three Trane split HPs with low ambient kits. I was
>> called
>>in because the tech who was there doing it said his compressor was "surging".
I get
>>there and get a few things fixed up and started the check out (outside ambient
is
>>below 70 degrees F). The condenser fan is cycling on and off, 3 seconds on, 3
>>seconds
>>off, which basically is causing the fan to speed up and slow down continually.
I
>>thought to myself, "Now that's different" and got out the installers guide and
sure
>>enough that's how it's supposed to work. OK, is it just me or does this sound
like
>>a
>>bad idea? I am a big fan of Trane equipment but this has got to be hard on
the fan
>>motor and the relay(s) involved.
>>
>> Joseph
>
> Ive never seen a compressor "surge" in all my days yet. He sounds like
> an idiot.
> 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
> it myself.
> Bubba
Finally got the installer's guide to the low ambient kit. Part #
BAYLOAM103.
Consists of a control module, oa sensor and Liquid line temperature sensor. It
appears
to be a simple head pressure control that cycles the fan to maintain a liquid
line
temp set point. You use the high side charging chart to determine the set
point. It
looks like the cycling rate of the fan is controlled by the module. It says it
will
cool
down to zero degrees F ambient temp.
The fan will only cycle when the ambient temp is below 70 degrees F.
Nothing
said about cycle rates and what the minimum or max rates are, however, there is
a test
switch that puts the condenser fan into a cycling rate of 3 seconds on/3 seconds
off
with a call for cooling. The cycling rate appears to be what ever it takes to
meet
the liquid line set point. When I watched the condensers they were not in test
mode
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...
http://cgi.ebay.com/eBayISAPI.dll?ViewItem&item=140151164800
HVAC-Talk...
http://tinyurl.com/ytmanx
Joseph
(never got back to check the mufflers)
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