My contractor says that he will NOT reconnect heat recovery line (from a 15 year old unit) while he is replacing this to a newer 14 seer veriable speed carrier (model 24abr348a003
And fk4dnf005000).

Reason he states that, with newer systems like this, heat recovery line is not of much advantage and doesn't save in electricity cost.

Is he right? Or he just cutting corners?

Please answer as soon as possible as I've not signed the contract yet.

Thanks.

If he will not hook up the recovery unit it is probably because this unit is precharged and he would have to recover refrigerant install new lines interrupting the hot gas line between the compressor and the condenser, pull a vaccuum, recharge the system and compensate for the additional lines with additional refrigerant . This unit was not designed to connect to a recovery unit and this is not to mention the factory warranty. It might save on operating costs, but my advice is to not hook it up. Mike

From the model numbers you posted , this system has a variable speed fan coil. But the condensing unit is the base unit with a 13 SEER not 14 as posted. If it were a 14 SEER (upgrade ) you could get a 10 year warranty on the compressor instead of the 5 year warranty that this unit has. In the model number the "B" stands for base, the "R" stands for R-22 refrigerant, the "3" in 348 stands for 13 SEER, the 48 stands for 48,000 BTU's( 4 ton) , the 300 stands for 230 volt single phase.
This is what "Letmetellu" was referring to , Mike