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Normal operation of hot water based heating system?

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Normal operation of hot water based heating system? Tuno 03-08-2007
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Posted by Tuno on March 8, 2007, 1:25 pm
I have a central heating system in a 3000 sq ft house that works by
taking hot water from the main water heater (a high efficiency 48-
gallon unit) and sending it to the air handlers. (When cooling, the
same air handlers take cold water from water chillers outside.)

What is the range of temperature I should expect to see between the
air intake and the registers when the system is operating normally?

(The water is 120 degrees.)

Thanks!

-ted in AZ


Posted by on March 8, 2007, 1:44 pm

> I have a central heating system in a 3000 sq ft house that works by
> taking hot water from the main water heater (a high efficiency 48-
> gallon unit) and sending it to the air handlers. (When cooling, the
> same air handlers take cold water from water chillers outside.)
>
> What is the range of temperature I should expect to see between the
> air intake and the registers when the system is operating normally?
>
> (The water is 120 degrees.)
>
> Thanks!
>
> -ted in AZ


What's the problem with the unit?



Posted by Tuno on March 8, 2007, 2:00 pm
> What's the problem with the unit?

I'm trying to verify that there is none.

The house is under a purchase contract, but the buyer's home inspector
failed the heating system because he could not get hot air from the
registers. That was because the water pumps were not plugged in (it
was still in "summer" mode). I now have the system configured to work
correctly, and I'm getting 15 degrees difference between intake and
registers. I'd like to know what I *should* be getting, so I can
confirm for the buyers that it's working properly.


Posted by on March 8, 2007, 2:33 pm

> > What's the problem with the unit?
>
> I'm trying to verify that there is none.
>
> The house is under a purchase contract, but the buyer's home inspector
> failed the heating system because he could not get hot air from the
> registers. That was because the water pumps were not plugged in (it
> was still in "summer" mode). I now have the system configured to work
> correctly, and I'm getting 15 degrees difference between intake and
> registers. I'd like to know what I *should* be getting, so I can
> confirm for the buyers that it's working properly.


Typical Home Inspector...

Since he failed the unit... (I'm not saying it's actually bad here...)

Why not have someone that KNOWS what they are doing inspect it now?

It could end up saving you LOTS of money... remember, just cause it works to
your satisfaction... doesn't mean that it's operating SAFELY.




Posted by Tuno on March 8, 2007, 3:13 pm
An HVAC professional as at the house as I type this. (He's the one who
measured the 15 degrees delta temp.) But neither of us know what is
*normal* for a unit like this. (This kind of heating is unusual in the
Phoenix area, which is mostly heat pumps and furnaces.)


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