[RE-wrenches] Need simple solution to reverse dry-contact logic on SQF water system

[Dana]

There is a pause in the CU200's switchover  it is not a
consistent time span either.

 

 

Is there any one from Grundfos on the list that can comment?

 

Thanks,  Dana Orzel

 

Great Solar Works, Inc

E - dana at solarwork.com

V - 970.626.5253

F - 970.626.4140

C - 970.209.4076

web - www.solarwork.com

 

"Responsible Technologies for Responsible People since 1988"

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf
Of solardude97
Sent: Friday, October 15, 2010 4:05 PM
To: allan at positiveenergysolar.com;
re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] Need simple solution to reverse
dry-contact logic on SQF water system

 

Allan,
A very simple way to do this is install a float in the tank
you are pumping to with a shutoff valve controlled by the
float. Install a Square D pressure switch with a DC rating
by the pump. As the float rises to full in  the tank and
chokes off the discharge outlet the pressure in the line
will rise and trip the pressure switch. We are using this
method exclusively as there seems to be a glitch in the high
frequency communication between the SQ Flex and the CU 200
controller.  The pump is not shutting off on command from
the controller consistently in stand alone applications. I
am aware of  a half  dozen of these systems experiencing
this issue.
You might install a small pressure tank in the line to avoid
water hammer in the system. Simple and cheap.
Nathan Jones
Power Source Solar Inc.
Springfield, MO
417-833-4274




 

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