Voltage limiting w/ C40 [RE-wrenches]

[Brad Bassett]

I would assume that the decoupling problem with these pumps would be 
unique to the HS version of the pump. The HS has a much more powerful 
motor than the standard 809, and the same coupling. I must assume also 
that the standard 809 is quieter than the HS, I would never install one 
of these buzzers in a customers house, and am not sure how long it will 
stay in mine, except that it's so darn efficient running about 35 watts.

Brad
AEE
 
Allan Sindelar wrote:
> 
> I have been following this decoupling issue with interest. This is the 
> first
> time I have heard of it. We use quite a few March 809BR/24 pumps as 
> primary
> loop and zone pumps with our SETH hydronic system. We have never 
> included
> any voltage limiting circuitry and have never observed the voltage
> decoupling problem described. We have never cautioned clients about high
> battery voltages when running pumps. Is it possible that this is either 
> a)
> unique to the 809BR/HS model with its more powerful motor, or b) a rare
> fluke?
> Allan at PosE
> 
> ----- Original Message ----- 
> From: "sunwise" <sunwise at cheqnet.net>
> >
> > I just installed two off-grid PV systems and did the control work and
> > pumps for in-slab heating using March 809BR24's (in-slab guy is going to
> > charge the system next week).  Then I started following this post and
> > got a bad feeling in my stomach.
> 

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