I have a 10 year old Trane furnace which apparently came with a 10
Seer coil. It was installed to go with an existing Bryant 8.5 Seer
compressor, which is now 20 years old and needs to be replaced.
I've been told that I can probably get an expansion valve so that the
Trane coil will work with a new 13 seer compressor.
Is this a good idea?
Do I lose the efficiency benefits of the 13 seer compressor?
What should an expansion valve cost?
Without getting the correct coil *AND* expantion valve, you wasting your
money. You might also check to see if your existing furnace is rated for 13+
SEER systems. A lot of manufacturers require a variable speed blower to
reach the advertised 13 SEER.
KM I am not AC person and I know I will get bombarded
by arrogance from some guys out there for what I am going
to say the only way you will get high efficiency if all components
are matched, however choosing 13 seer condenser with all
10 seer cooling coil you will not get less then 10 seer perhaps
even 12. is it good idea to do this "no" it is not but vs. cost
of installing new coil it maybe cost effective because your new
unit will not last 20 years that I can guarantee, new units that are
manufacture is nothing more then throw way crap.
So if I was you replace condenser and use old coil.
The SEER Rating is a combination of the condenser and the compressor as
it is matched with a evaporator coil.
What is the tonnage of the 10 SEER E-Coil?
What is the tonnage of the rated 8.5 condensing unit?
Where do you live? I will look up the Summer design dry-bulb & Wet-bulb
figures for your area.
Do a Manual J to find out what the BTU/hr heat-gain is.
Then do a manual D on the ductwork. Make sure there are NO duct leaks!
Then do everything you can to Reduce the heat-gain of your home! I
personally, would borrow the money if necessary to reduce the cooling &
heating BTUH requirements.
The 13-SEER holds considerably more Refrigerant than a 8.5 or 10-SEER
condenser, therefore if you can downsize the condenser tonnage by a Ton
below the E-Coil, & by installing a TXV, it "might" work without causing
damage the compressor. (A proficient TECH could determine if it is
operating within normal perimeters - Efficiency of operation could be
determined within a ball park figure.)
It is important to get enough heatload on the condenser to make it
function near its capacity. The blower and duct design locations of the
Return air intakes & Supply air outlets makes a difference depending on
how well the air is mixed.
All of the above is mere theory that you can discuss with local
contractors, do NOT follow it as advice! Discuss all the dimensions of
your situation with a number of local HVAC Contractors and follow the
best advice you get! Learn all you can before making a decision! - udarrell
I am NOT liable for your decisions, you make your decisions along with
your contractor(s) Advice! - udarrell
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