SQ pumps on mod sine wave [RE-wrenches]

[Ray Walters]

>To: "'RE-wrenches at topica.com'" <RE-wrenches at topica.com>
>From: "Jeffrey Wolfe, Global Resources" <global at sover.net>
>Subject: RE: SQ pumps on mod sine wave [RE-wrenches]
>Date: Mon, 22 Apr 2002 14:11:41 -0400
>Reply-To: RE-wrenches at topica.com
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>Kirk,
>
>Just a guess. Check the check valve in the pump line to teh pressure tank. 
>Does it share a check valve with the spring pump system, or does it have 
>it's own? It could be hanging, causing the pressure drop off. The slow 
>start should not do this. Sounds like you're getting water flow the wrong 
>way sometimes.
>
>	
Jeff's guess is worth investigation. If the check valve were hanging, the
DC pump kicking on could be causing it to reseat, which would explain why
the SQ wouldn't build pressure over 15 psi, then would work fine.(check the
pump chart to estimate the flow rate of the leak)
We did a few dual pump systems for y2k, they can be lots of trouble,
especially when you have different pressure switchs and pumps feeding from
different sources to the same pressure tank.
Windy's probably right though, I have had bad luck with an SQ pressure pump
on a DR series inverter 4 years ago. It would try to start, run through a
couple of different RPMS, then shut off.

Good Luck, Ray

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