180 psi at suction line (3X higher then chart)

	180 psi at suction line (3X higher then chart) - 4T Carrier heat pump

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Author

Date

180 psi at suction line (3X higher then chart) - 4T Carrier heat pump

davefr

11-05-2006

Re: 180 psi at suction line (3X higher then chart)...

AKS

11-05-2006

Re: 180 psi at suction line (3X higher then chart)...

Al Moran

11-05-2006

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Posted by davefr on November 5, 2006, 12:24 pm

My old Carrier heat pump seems to be operating sub optimally.

- Suction Line - 180 psi
- Liquid line - 200 psi
- Temp of suction line at condenser unit - 180 degrees
- Temp of liquid line at condenser unit - 70 degrees
- Temp rise from cold air return to closest indoor register - 15
degrees. (it's been closer to 20 degrees in the past)
- Outdoor ambient 50 degrees

The operational chart from Carrier suggests Liquid should be approx.
240 psi and Suction should be about 60 psi given these temps in
heating mode..

What would cause my Suction pressure to be so high and yet the unit
still produces about 15 degrees heat rise?

Could a leaky reversing valve or a low refrigerent level cause this??

Posted by AKS on November 5, 2006, 5:58 pm

I am not that familiar with heat pumps
but will make this comments that it does not matter
if is in cooling mode or in heat mode
your suction should be within few PSI above freezing point
regardless what type of refrigerant system may use
look up pressure chart. naturally the head pressure will
vary with different refrigerants same as suction
check you diverting valve make sure is not bypassing
or leaking through, valve you mention that is
located between accumulator and compressor
is possible to be hot gas bypass, but 40 psi
do not make much sense

Good luck from Dido

> My old Carrier heat pump seems to be operating sub optimally.

> - Suction Line - 180 psi

> - Liquid line - 200 psi

> - Temp of suction line at condenser unit - 180 degrees

> - Temp of liquid line at condenser unit - 70 degrees

> - Temp rise from cold air return to closest indoor register - 15

> degrees. (it's been closer to 20 degrees in the past)

> - Outdoor ambient 50 degrees

> The operational chart from Carrier suggests Liquid should be approx.

> 240 psi and Suction should be about 60 psi given these temps in

> heating mode..

> What would cause my Suction pressure to be so high and yet the unit

> still produces about 15 degrees heat rise?

> Could a leaky reversing valve or a low refrigerent level cause this??

Posted by Bob_Loblaw on November 5, 2006, 7:59 pm

> I am not that familiar with heat pumps

> but.."insert useless advice here"....

Then shut up, you dope, and let someone answer who IS familiar with heat
pumps.

--
Respectfully, Bob

Posted by RSCamaro on November 8, 2006, 6:19 pm

>I am not that familiar with heat pumps

>but will make this comments that it does not matter

>if is in cooling mode or in heat mode

>your suction should be within few PSI above freezing point

>regardless what type of refrigerant system may use

>look up pressure chart. naturally the head pressure will

>vary with different refrigerants same as suction

>check you diverting valve make sure is not bypassing

>or leaking through, valve you mention that is

>located between accumulator and compressor

>is possible to be hot gas bypass, but 40 psi

>do not make much sense

>Good luck from Dido

Ever wonder why a heat pump has a defrost cycle Dido? Yes, that's
correct, because in heat mode the condenser section can and often
frosts up which impedes air flow across the coil. Whooda thunk that
when you're pulling the heat from sub 50ºf. temps the coils might
actually reach freezing temps.

To answer the OPs question, he needs the minimum 8 temperature and
pressure readings to diagnose the refrigerant charge over the
internet. Or just use the charging chart like everyone else does.

...Ron
--
68'RS Camaro
88'Formula
00'GT Mustang

Posted by AKS on November 9, 2006, 7:00 pm

>>I am not that familiar with heat pumps

>>but will make this comments that it does not matter

>>if is in cooling mode or in heat mode

>>your suction should be within few PSI above freezing point

>>regardless what type of refrigerant system may use

>>look up pressure chart. naturally the head pressure will

>>vary with different refrigerants same as suction

>>check you diverting valve make sure is not bypassing

>>or leaking through, valve you mention that is

>>located between accumulator and compressor

>>is possible to be hot gas bypass, but 40 psi

>>do not make much sense

>>Good luck from Dido

> Ever wonder why a heat pump has a defrost cycle Dido? Yes, that's

> correct, because in heat mode the condenser section can and often

> frosts up which impedes air flow across the coil. Whooda thunk that

> when you're pulling the heat from sub 50ºf. temps the coils might

> actually reach freezing temps.

So my guess was close enough that it is hot gas bypass
But? it should have been located before the accumulator
and not after.
Thank you for verifying Dido

> To answer the OPs question, he needs the minimum 8 temperature and

> pressure readings to diagnose the refrigerant charge over the

> internet. Or just use the charging chart like everyone else does.

> ...Ron

> --

> 68'RS Camaro

> 88'Formula

> 00'GT Mustang

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