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Newbie with a heater question

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Hi all need some expertise I have just bought a bessacar cameo 550 gl with the primus aquaflex central heating system but unfortunately can't get it to go, the boiler heats up and I can get hot water but the water don't flow around the system the pump is brand new so it can't be that, I'm not sure if it needs bleeding but can't find any bleeding nipples. Can any one please help many thanks spencer .

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Posted

Welcome. Don't know much about the primus system but I suspect there will be a room thermostat somewhere in the van.

Try to find it and see if it is turned up.

Is the pump running?

You could try putting 12v straight on the pump.

Ian

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As you say the boiler is working and the water is getting hot, then the fact the pump is not circulating the inhibited fluid around is near 100% likely to be due to an "air lock" in the circuit.

I assume here you can hear that the pump is running, so it is not a thermostat issue.

The circulating pumps used in these types of systems are very "weak" in the pressure they can generate, they don't need to be any more powerful, and being so would make unwelcome noise. This "unfortunately" means that if in the slight rise and fall of the pipes around the van, you have air trapped in the "humps", then the pump has not enough "welly" to push that bubble down and on its way to be released when it gets to the header tank. Hence bleeder points are typically placed where the pipes, towel rails etc might cause air to form an air lock.

You need to try and trace the pipework seeking out where the builder might have fitted bleed points; bleed these but ensure you keep the header refilled. With the pump running you might then be rewarded with the fluid starting to "circulate". Once that is achieved then any smaller bubbles will find their way to the header and be released. Sometimes it helps to tip the van as extremely as you can, end to end; ie to help migrate the air lock towards a bleeder, where you can get rid of it.

The professionals carry a portable more "powerful" pump and extra hoses that they can stick into the circuit. This pump has the "welly" to make short shift of the air lock bubbles, forcing them downhill and on their way.

But DIY purging is practical if you can find where the bleeders are located; unfortunately you might have to find them all, as sods law has it that the one you can't find, is where the airlock is sitting.

Best of luck.

5

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Hi thanks for all your replies I have looked everywhere in the van and can't find any bleeding points at all I'm getting hot water to the taps and shower but not to the heating rads any ideas ? Thanks

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Posted

Does it have a multi point valve on the system? if it has check that the valve changes when you switch over to heating.

Lance

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The system relies mostly on thermal flow so as said the pump action is an aid rather than the driving force, it does then sound like an air lock. In the absence of bleed points it's a matter of tipping the van trying to help move the air lock towards a means of removing it, either the header tank or perhaps cracking a joint open to bleed it out much like if it was a purpose made bleed point?

What I do know for certain as far as Primus systems are concerned and they are good systems, very good actually, you need to talk to Bernard 01460 62695

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Posted

Hi finally sussed it thanks all who commented you where all very helpful but now 1 of the radiator blocks is leaking any ideas on where I can get one or how to repair thanks spencer ???

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your local car radiator repair man will weld/braze up cracks etc, otherwise contact Bernard, or I dare say Aldi rads will be the same, Aldi International, Wellingborough, Northhants 01604 494193

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Hi thanks again I have got the system going now, heating up etc but now it's only heating up one rad and the the boiler cuts out and when I switch on the water heater switch it trips the whole lot any ideas ???

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Hi can anyone tell me where I can get a primus central heating circulation pump many thanks spencer ????

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