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Last seen: Apr 29, 2025
@william1066 Hi William, With my PWM driver chip not working I have been Controlling Both of my PWM pumps using a Pulse Generator. The Pulse ge...
@iancalderbank My PWM System appears to be faulty. Following a Visit from a SAMSUNG Engineer , I asked him "why does my PWM System NOT work." H...
@william1066 Hi William, Many thanks for the info from Midsummer ! I am now convinced that my particular SIG/REF output from my Control PCB is ...
@derek-m The Signal output from my Control PCB on SIG/REF appears to be faulty or incompatible with the motor load. The Scope is connected to SIG...
@derek-m I have got it !!I have TWO Grundfoss cables One with the PWM output on the Black wire the second with the PWM on the the Brown wire. ...
@derek-m Delta_T and PWM control. Hi Derek, The "Signal apparent on my SIG/REF pair of pins on my SAMSUNG PCB changes slightly with the Dela_T set...
@derek-m Cautionary notes from SAMSUNG ,GRUNDFOS All of the notes from both GRUNDFOS and SAMSUNG cheerfully advise "that if it does'nt work reverse...
The PWM SIGNAL output from a SAMSUNG PCB ......... To obtain this signal I changed the Field parameters 4051 for a Delta T of 3 C bringing up the ...
@derek-m IHi Derek, will try a load resistor on the SIG/REF pins. Given contradictory information from GRUNDFOS about the Black and Brown PWM ...
@iancalderbank Mank thanks ian, Do you know of a SAMSUNG TECH Support that is not pushing You tube videos that are always for a different model ,...
@derek-m I have two Grundfos PWM motors of type GrundfosUPM3 FLEX AS 25-75 130 AZA Both pumps can be driven very successfully from a pulse gene...
I have now tested my Grundfoss motor on my Primary Heat Pump to Heat exchanger loop. compared to my first, Radiator loop Motor The Radiator m...
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Latest Posts
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RE: How quickly would you want/expect heat recovery to take from setback?
@jamespa I was thinking primarily of raising the flow t...
By AndrewJ , 8 hours ago
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He's down for a bit of maintenance... I'll restore him ...
By Mars , 9 hours ago
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RE: Why don't people choose heat pumps?
So a bunch of things rather than generate a load of rep...
By EtchedPixels , 9 hours ago
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RE: Heat Geek Zero Disrupt: Are We Sleepwalking Into Another Race to the Bottom?
That is a good approach and an excellent result. For co...
By Judith , 13 hours ago
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RE: Our 10 year old Grant heat pump failed
@editor @mike-patrick A 10 year old grant heat pump ...
By JamesPa , 16 hours ago
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RE: Buffer tank on a 2 x 14kw Ecodan system
In principle I agree but for what? OP has drawn a sche...
By JamesPa , 18 hours ago
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RE: Say hello and introduce yourself
Good to see you here, @claytonbrowne, and welcome to th...
By Mars , 21 hours ago
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RE: Issues with Samsung heat pump – high running costs and house dropping to 11C overnight
It looks very much like a radiator balancing i...
By hml1827 , 2 days ago
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I have, @transparent, but chose to pose the question he...
By Majordennisbloodnok , 2 days ago
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RE: Should I change my cylinder when changing from a gas boiler to a heat pump.
@jamespa’s point about payback is a useful counterbalan...
By Mars , 2 days ago
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If it no longer works after forgetting its settings and...
By bobflux , 2 days ago
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RE: Plug and play solar. Thoughts?
Impressions so far from the one I've installed are that...
By EtchedPixels , 2 days ago
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RE: Air source heat pump roll call – what heat pump brand and model do you have?
@editor And as an occasional contributor, may I say wel...
By Toodles , 3 days ago
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