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Originally Posted by |kbn|
Sorry for going o/t got a few questiosn realting to this...
Ive ordered a D4, should arrive tomorrow to replace my 1250. What part acctually gets niosy in the D4? Im hoping it just cavatates at 16v (sp?) becuase of lack of water at suction side. If its the motor/bearings then ill be forced to run it at 12v 
Btw d4 pumps are rated for 24v aint they?
Also If I had a heatercore outside, thats about 6m down+ 6m up + all the stuff blocks etc atm, would that be bad for flow? |
The noise according to Cathar is genarated becase the pump uses square wav DC to drive it
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The noise would most likely be from the flipping magnetic fields of the brushless micro-controller introducing small vibrations. The Laing engineer said that a square-wave generator pattern is used to flip the fields, and indeed if you've ever listened to a square wave through a speaker, there is a striking similarity to the tone of the noise heard that the pump makes.
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