To TEV or not to TEV?

Posted by Jean on February 22, 2009, 12:09 pm

What are your thoughts on adding TEV's to a 2 Ton, A410 heat pump?

If my current situation requires a complete pump out, purge and
re-install of refrigerant, would it be advantageous to install TEV's
to replace pistons?

My HVAC tech says it is half a dozen of one and six of the other
unless the culprit is one of the existing valves.

He says it helps under certain circumstances but also adds one more
thing that could go wrong in the future. He said a correctly sized and
installed unit should not absolutely require them.

The extra cost at this time would be about $200 for valves and hard
start capacitor.

Any comments on TEV's vis-a-vis A410?

Posted by Noon-Air on February 22, 2009, 12:23 pm

All of the Rheem systems that I install already have TXVs already installed
on them. They come that way from the factory, as well as having a new
filter/drier included for installation when the refrigerant lines are brazed
up. There is a reason that they are a bit more expensive. Then there is also
the "conditional unit replacement" warranty on the Rheem Prestege series.
You get what you pay for.

> What are your thoughts on adding TEV's to a 2 Ton, A410 heat pump?
> If my current situation requires a complete pump out, purge and
> re-install of refrigerant, would it be advantageous to install TEV's
> to replace pistons?
> My HVAC tech says it is half a dozen of one and six of the other
> unless the culprit is one of the existing valves.
> He says it helps under certain circumstances but also adds one more
> thing that could go wrong in the future. He said a correctly sized and
> installed unit should not absolutely require them.
> The extra cost at this time would be about $200 for valves and hard
> start capacitor.
> Any comments on TEV's vis-a-vis A410?

Posted by Jean on February 22, 2009, 2:42 pm

wrote:

>All of the Rheem systems that I install already have TXVs already installed
>on them. They come that way from the factory, as well as having a new
>filter/drier included for installation when the refrigerant lines are brazed

Installer added one to liquid line although there was one installed by
factory just on the other side of service valve inside the housing.

>up. There is a reason that they are a bit more expensive. Then there is also
>the "conditional unit replacement" warranty on the Rheem Prestege series.

I've now learned that TXV, crankcase heater, defrost control w/ 30
second switchover delay & anti-short cycle protection, hi-lo pressure
lockout, sound blanket and variable speed blower are a MUST have. I am
looking to have the defrost control replaced with Lennox 34M63 when
the current problems are resolved.

In addition, I might add, a highly qualified and knowledgeable HVAC
tech is more important than the make or brand of the heat pump.

>You get what you pay for.

So true.

Initial quotes for complete system were in the $6,000 to $8,000 rang
for recommended 2 Ton unit (from experience, a 1 1/2 Ton unit would
have been a better choice).

I did notice that the higher quotes were accompanied with statement
that there was a government rebate program ($1,800) that could apply.
(Wink, wink. Nudge, nudge. Say no more. Say no more.)

>> What are your thoughts on adding TEV's to a 2 Ton, A410 heat pump?
>> If my current situation requires a complete pump out, purge and
>> re-install of refrigerant, would it be advantageous to install TEV's
>> to replace pistons?
>> My HVAC tech says it is half a dozen of one and six of the other
>> unless the culprit is one of the existing valves.
>> He says it helps under certain circumstances but also adds one more
>> thing that could go wrong in the future. He said a correctly sized and
>> installed unit should not absolutely require them.
>> The extra cost at this time would be about $200 for valves and hard
>> start capacitor.
>> Any comments on TEV's vis-a-vis A410?

Posted by Steve on February 23, 2009, 12:22 am

> wrote:

>>All of the Rheem systems that I install already have TXVs already
>>installed
>>on them. They come that way from the factory, as well as having a new
>>filter/drier included for installation when the refrigerant lines are
>>brazed

> Installer added one to liquid line although there was one installed by
> factory just on the other side of service valve inside the housing.

>>up. There is a reason that they are a bit more expensive. Then there is
>>also
>>the "conditional unit replacement" warranty on the Rheem Prestege series.

> I've now learned that TXV, crankcase heater, defrost control w/ 30
> second switchover delay & anti-short cycle protection, hi-lo pressure
> lockout, sound blanket and variable speed blower are a MUST have. I am
> looking to have the defrost control replaced with Lennox 34M63 when
> the current problems are resolved.
> In addition, I might add, a highly qualified and knowledgeable HVAC
> tech is more important than the make or brand of the heat pump.

>>You get what you pay for.

> So true.
> Initial quotes for complete system were in the $6,000 to $8,000 rang
> for recommended 2 Ton unit (from experience, a 1 1/2 Ton unit would
> have been a better choice).
> I did notice that the higher quotes were accompanied with statement
> that there was a government rebate program ($1,800) that could apply.
> (Wink, wink. Nudge, nudge. Say no more. Say no more.)

they are correct.... with the passage of Obamas "stimulus" package, that was
part of it *if* the system qualifies. It must be a minimum of 16.00SEER, an
HSPF of 9.0, and have ECM fan and blower motors.

Posted by UDARRELL on February 24, 2009, 7:11 am

Noon-Air wrote:

> All of the Rheem systems that I install already have TXVs already
> installed on them. They come that way from the factory, as well as
> having a new filter/drier included for installation when the
> refrigerant lines are brazed up. There is a reason that they are a bit
> more expensive. Then there is also the "conditional unit replacement"
> warranty on the Rheem Prestege series. You get what you pay for.

Usually don't need start kit with Scroll compressors.
A TEV/TXV has many advantages over a piston.
Best combo, Scroll with a TXV.
Many other factors to consider:
http://www.udarrell.com/proper_cfm_btuh_duct_sizing_air_conditioning_systems.html

My top hit page. - udarrell

--
WISDOM PRINCIPLED EMPOWERMENT COMMUNICATIONS -
THE REAL POLITICAL ISSUES & WISDOM Principled PEOPLE EMPOWERMENT

http://www.udarrell.com/broadcasting_tbframes.htm

http://www.udarrell.com/my_pages2.htm - Links to my pages

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