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joe1963

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Discussion starter · #1 ·
Ok this one is a mind twister to me, I haven’t worked on a heat pump system in a wile, currently the unit I am working on has following issues;
The unit is a 5 ton split system 410a with a heat pump
This is what’s happening:
In cooling mode unit turns on and runs but the suction line pressure is 101 and the liquid line side is 198, I added 410a liquid form and the pressures went down ?????????
So I thought the reversing valve was not working I disconnected the fan turned it to heat then back to cool and it sounded like it was working.
Now it really gets confusing
I put it in heat mode
Both the suction line pressure and the liquid line pressure climbed to 455psi at the same time, and the condenser shut down with in one minute. Any body have a clue what can be causing this????????
 
#2 ·
A suction line pressure of 101 sounds a little high to me. Whats your superheat?
 
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#3 ·
where are you taking your suction pressure?
Hint: should be on the third port, not the regular suction line port.
 
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#5 ·
joe1963 said:
Both the suction line pressure and the liquid line pressure climbed to 455psi at the same time, and the condenser shut down with in one minute.
Click to expand...
Identify your common suction, hot gas discharge, and liquid return lines, in heating mode.
Sounds like you have a metering issue for cooling. No way to tell with the little bit of info you gave.
 
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#9 ·
sounds like you are connected to the hot gas port and not true suction
also sounds like an over charge
have to feed 410 slowly and let it stabelize before adding more it is to easy to over charge
not like 22 when you can bring it up and good
 
#10 ·
Where do you have your low side gauge hooked up to on the outdoor unit?
To answer your question on the txv, in heating mode the refrigerant flow is reversed and you want the refrigerant to either check around or go through the valve with out resrictions on the indoor coil. You probably already know this, but if I had a suction and high side pressures the same, I would know that my low side gauge is hooked up to the large line on the line set, not suction on the compressor. Look for a 3rd port.
 
#12 ·
Even a good tech needs proper training on heat pumps by someone who REALLY understands them. No offense but if you don't know heat pumps you shouldn't be trying to fix them. You need to get your low side on the charging port (the third port your not seeing) and get all the info. Did you check simple things like air flow, dirty coil or filter? Get more info from the right places and try again.
 
Discussion starter · #13 ·
Williamsma i think you have just helped me figure this out
the low side and high side are hooked up correct.
but this is starting to make sence
if the txv is wide open then my presures in cooling mode make sence if the unit is over charged and if the unit is over charged knowing that the refrigerant flow thew the txv valve with out resrictions is the proper procedure it would make sence that my issue is over charged and the txv is wide open not to mention that the reversing shifts due to pressure differential does it sound like we may have found the answer.
 
#14 ·
If you have your gauges hooked up to the hi and low side (where you check a/c) you will never ever ever ever get a low reading if you switch them around any way from now till next Sunday. Look down through the top at the compressor, you may see a small line tapped in the larger line going into the compressor. If you are working on a new Trane unit, pop the door off next to the control door (cont actor and cap, board...) and you will see more taps to hook into to. Sorry if I'm not getting this, but to end it, are you on the dedicated low port (third port)
 
Discussion starter · #15 ·
the unit is a klimaire there is only 2 ports on it if there are ports inside the unit by the compresser there would be no way to access them wile it is running
 
#17 ·
I'll check out the above link. But to clear this up, that little line I'm talking about is taped into the suction line at the compressor and the other end of is that third tap. (out of harms way) We have 90% heat pumps in my area.
 
#19 ·
initially it does seem to have an indoor TXV problem
 
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#20 ·
joe1963 said:
the unit is a klimaire there is only 2 ports on it if there are ports inside the unit by the compresser there would be no way to access them wile it is running
Click to expand...
Sounds like a side job or DIY to me! Klimaire??? isn't that the unit you get from a local misc HVAC parts house, when they do an OTC sale??? Hush hush...... or an online DIYer.
You get what you pay for! You sure got the low price guarantee... right along with the low quality guarantee aswell!

You should probably call a real technician before you completely ruin your $500 heatpump system. Face the facts, you don't know what you're doing.

I found out the hard way, I suck at installing carpet. Paid a pro to do it, no problems, was done while I worked, saved money in the long run...
 
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