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rupa78
09-10-2009, 10:40 PM
Should a TXV kit automatically be part of a high end heat pump/air handler? Or is it something you have to ask for to be installed. I thought I read somewhere that they should always be installed with a dual stage compressor for added efficiency. True or false?

What has thrown me off (besides not knowing much about HVAC :grin2:) is an AHRI Cert. for one of the systems I am considering. The equipment combinations on the certs. are driven by the need to qualify for the tax credit. Cert. #1492756 for an Amana ASZ180481A lists the indoor unit AEFP426016C +TXV. The other cert. #552730 for a Lennox XP19-048-230 has no TXV showing with the air handler CBX32MV-068-230.

Is the TXV just a natural part of the Lennox, or is not required to meet the specs shown? If not required, would the system be more efficient with the TXV?
beenthere
09-10-2009, 11:14 PM
Some air handler coil combinations, only come with a TXV. So no reason to say plus TXV.
rupa78
09-10-2009, 11:28 PM
Some air handler coil combinations, only come with a TXV. So no reason to say plus TXV.

Thanks, I was hoping that was the answer. Are you inferring that the Lennox combination mentioned falls in that category?
beenthere
09-10-2009, 11:43 PM
It may. I don't know. But I wouldn't be surprised if it does.
gary_g
09-11-2009, 10:08 AM
What has thrown me off (besides not knowing much about HVAC :grin2:) is an AHRI Cert. for one of the systems I am considering. The equipment combinations on the certs. are driven by the need to qualify for the tax credit. Cert. #1492756 for an Amana ASZ180481A lists the indoor unit AEFP426016C +TXV. The other cert. #552730 for a Lennox XP19-048-230 has no TXV showing with the air handler CBX32MV-068-230.

Foor Goodman/Amana, a TXV is optional depending on the air handler/coil and may have to be purchased separately, although it is required to obtain the AHRI ratings for SEER/EER etc.

In the model number of the air handler, AEPF426016, the "F" means that it comes with a "flow rater expansion valve". If the model number were AEPT, the "T" means that it would come with a "TXV".

Take care.
wahoo
09-11-2009, 10:34 AM
Most Lennox Air Handler units come with a built in TXV, and the Amana/Goodman units have an external mounted TXV that needs to be installed to get the higher SEER ratings. On a service note, the external mounted TXV are MUCH easier to service/replace!