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Old 11-30-2009, 07:28 PM   #1
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Variable speed Blower

4 years ago, i purchased a Heil h9mpt075f14c Furnace. It is a 92% dual stage furnace.

I am looking to possible upgrade to a Variable speed blower, due to temperature variations throughout the home.

The issue I have is verifying if this is a possible upgrade option. While searching on the net, I have come across this info, from this file

Variable speed blower upgrade kit
(consists of motor, electronics and
wire harness for twostage furnaces

NAHL050VBB *9MPT050(C)
NAHL075VBB *9MPT075(C)

NAHL100VBB *9MPT100(C)
NAHL125VBB *9MPT125(C)
NAHA050VBE *8MPT050(B)
NAHA075VBE *8MPT075(B)
NAHA100VBE *8MPT100(B)

NAHA125VBE *8MPT125(B)

The contractor who Installed the furnace, says there is no upgrade kit, I have emails in to 2 other Retailers in my area, but no response yet. I was hoping a Forum like htis would result in someones Better understanding, If this is doable or not.



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Old 11-30-2009, 09:17 PM   #2
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It has to be "specifically" designed for the model of furnace or it won't work. The airflow cfm is critical or it will overheat/damage the heat exchanger etc and the electronics must be programmed specifically for each different BTU size of each furnace. If they don't understand it that is not good either.


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Old 11-30-2009, 10:07 PM   #3
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I am a Arcoaire dealer and Arcoaire is an ICP product just as Heil is.

There is no upgrade kit and if there was it more than likely cost more than a new furnace. Just the VS motor can cost more than $750 and a control board, VS controler, and wiring harness.

If you truely want a VS then you may be wise to replace the furnace.
John Wayne once said "Life is tough and it is even tougher if you are stupid"

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Old 12-01-2009, 03:33 AM   #4
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What he said.

Heil dealer here.
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Old 12-01-2009, 04:45 AM   #5
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Emerson has an upgrade kit for furnaces now. Works on any furnace.
Ask your contractor to check into it.

How ever. It may not give you the benefits you want. A VS motor can only do so much good on an undersized duct system.

As said earlier. Its not cheap. You may wish to have your duct and registers upgraded instead.
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