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GRANT Air Source Heat Pumps

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Discuss GRANT Air Source Heat Pumps in the Air Sourced Heat Pumps area at Plumbers Forums

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alibryant69

hi i have just installed to 15kw grant ashps to a 16th century manor rebuild and a grant 26kw oil boiler to meet the demand for heat and water when the ashp's dont meet the demand, the whole systems set up correctly through a low loss header in the basement... but my problem is the air sources are drawing close to 300 amps when the start up, this spike happens at least 30 times a day and everyone else in the area has problems with their lights etc when this happens, the electric board are now threatening to cut the power to the house... when we went back to grant they didnt have a clued and kept fobbing us off with excuses like they have come out to look at it when they havent and they are making something to fix this??? which if they havent looked at the ashp's how can they know??? has anyone else out there had any similar problems?? many thanks alastair
 
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quality said:
You need a refrigeration engineer to evaluate the refrigeration/electrical circuits, Where are you based ?
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I agree but while Grant have not yet started their warranty it has to be up to them to repair it if we get an independant engineer to look at it or possibly sort it out will this not then result in them cancelling any warranty?

I'm sure if I delved in deep enough I could probably sort it but it's not my responsibillity I just feel sorry for my customer that has them fitted...

also info not stated yet is that when the units were first put in they come fitted with an outside air temp sensor... when the units froze up in the very cold winter we had the first thing they did was to disconnect the air temp sensor and fit a resistor in its place so now they are still going into a de-frost mode but surely in this milder weather they should never need to go into this de-frost mode where they essentially just waste heat blowing it outside... which in turn makes them uneconomical when this is mentioned to Grant they tell us that all the units are now being done like this... going back to them telling us we have the only units that are playing up why would they roll out a second rate modification that forces the units to use more electricity.
 
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I would suggest that if they are going into defrost in this weather then Grant need to come and see to these units asap
 
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Like I said they are only going into De-frost mode due to the fact they have disconnected the outside air temp sensor and replaced it wit a resistor which is ther to fool the controls into thinking it is colder than it is
 
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If I were in your position or the customers I would be would getting Grant out everyday until they got the unit working correctly. If Grant claim that the units are working correctly then clearly the unit is not fit for purpose and should be removed and the customer gets their money back and some compensation
 
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Most definatley Grant responsability I have on many occasions evaluated underperforming systems as an independant 3rd party and have never yet failed to get a positive result from the manufacturer
 
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unguided1 said:
If I were in your position or the customers I would be would getting Grant out everyday until they got the unit working correctly. If Grant claim that the units are working correctly then clearly the unit is not fit for purpose and should be removed and the customer gets their money back and some compensation
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My thoughts Exactly...
 
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quality said:
Most definatley Grant responsability I have on many occasions evaluated underperforming systems as an independant 3rd party and have never yet failed to get a positive result from the manufacturer
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Are you talking about probs with ASHP's if so have you had any dealings with Grant?
 
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ecowarm said:
I agree with Unguided1, get grant out asap and the weather comp being by-passed is a joke
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like I said in earlier posts Grant do come to look at it but they can't wait to get back in the van and on the way back home due to the distance they have to travel and when contacted they seem very lax in coming to see them it can take weeks to get them there and when they leave they say they will put together a report on there findings but when we call them back eveyone denies any knowledge of previous visits
 
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Electrician said:
like I said in earlier posts Grant do come to look at it but they can't wait to get back in the van and on the way back home due to the distance they have to travel and when contacted they seem very lax in coming to see them it can take weeks to get them there and when they leave they say they will put together a report on there findings but when we call them back eveyone denies any knowledge of previous visits
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I reckon that if you block their van in they have got stay as long as you do, and If it were my customer I would make sure that I turned up with a sleeping bag, mind you the giant thumb of doom hates it when I refer to her as my sleeping bag!!!!!!!!!!
 
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As Unguided says, block their van in or take a photo of them whilst they are looking at the unit. That way they cannot deny any knowledge of the unit/visit.
 
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unguided1 said:
I reckon that if you block their van in they have got stay as long as you do, and If it were my customer I would make sure that I turned up with a sleeping bag, mind you the giant thumb of doom hates it when I refer to her as my sleeping bag!!!!!!!!!!
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lol like ur style but u haven't seen the size of the driveway...... might be better to get a wheel clamp....
 
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Usually any heat pump that has an immersion fitted is because the manufacturer has optimised the heat pump to comply with EN14511, so that the unit can attain MCS accreditation, and because the unit has been optimised to work at between 6 and 7 degrees c this means that when they work at temperatures below minus ten c they start to fall down hence the back up immersion, so really I would say that in reality it is not fit for purpose especially if these units are doing both heating and hot water
 
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yes they are doing both heating and hot water but obviously at the moment only hot water due to the fact that the building is a new build with a very high standard of insulation even down to triple glazing and far and above building regs insulation for walls and ceilings
 
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Electrician said:
yes they are doing both heating and hot water but obviously at the moment only hot water due to the fact that the building is a new build with a very high standard of insulation even down to triple glazing and far and above building regs insulation for walls and ceilings
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so at what temperature are the flow and return temps on the heat pumps
 
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quality said:
I served my time way back when as an electrcian , Then went into refrigeration / HVAC the rest is history and a long one at that
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ok cool wel my customer is now watching this thread too so if he gets intouch with me and wants ur contact details i will pm you :)
 
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