I'm about to order my radiators for the van, (Ultraheat do down to 200mm
wide rads, just waiting for a price) still waiting for the boiler
(eberspacher diesel fueled hot water furnace) to arrive, so whilst i'm
waiting i'm going to run the pipes for the radiators.

Never done any central heating work before, so any tips welcome, tho i
imagine half the things applicable to a house arent to a van... or maybe
they are.

The system is basicaly going to be a single boiler and 2 pumps, one for the
calorifier (small hot water cylinder) that part is easy, from the outlet of
the boiler a pipe goes to a Y piece, then to the 2 pumps, pump one then has
a pipe from the outlet of the pump to the calorifiers coil inlet, the outlet
goes to a Y piece and back to the boiler return, that circuit compleated,
simple etc.

For the central heating, i run a pipe from the outlet of pump two, around
the van, and back to the Y piece to the boiler return.

The boiler will be situated about halfway down the van's length, on the
right hand side in an underfloor locker, a 15mm pex (speedfit) pipe will
come off the pump and go through the floor into the living area, it'll loop
backwards slightly and then go down to the back end of the van about 4
meters, then turn right accross the van for 2 meters, then turn again to
come up the left hand side of the van, it'll go up for 4 meters and that's
the end of the flow pipe, it then loops around and follows the pipe back to
the boiler.

The radiators, one will be off the begining of the pipe where it loops back
slightly when it enters the living area from the floor,

the second rad will be at the back of the van, on the left hand side just
after the pipe turns the corner,

And the last rad will be at the end of the pipe run where it loops back,

i'm using thermostatic valves on all rads,

problem i see is, how on earth do i stop the first radiator with a full open
flow valve allowing all the hot water to go through the rad and into the
return line, thus avoiding the water going round the rest of the pipework?

And more importiantly, how do i stop the last rad on the pipes being
bypassed because that's where the flow becomes the return line??

I dont really want to have a rad with no thermostatic valve on it as used in
home heating sytems, and eberspacher recomends that you just put thermo
valves on all rads, and the boiler takes care of it's temperature to when to
shut off and start up... when the water temp is at something like 86 degrees
for 5 minutes it shuts down but keeps the pump running, when it drops to
about 79 it starts up again, so no need for a room stat on this system.

Do i have the last radiator piped up as the return junction... i.e. flow
goes into the rad, return comes from the rad rather than Teeing off the flow
and return pipes as the other rads do?
then fit one of those differential bypass valves near the pump? this thing
flows 900 litres an hour, not sure if that's low or high compared to home
systems.

or would i put the bypass valve at the last rad connection?? or do it a
totaly different way altogether?

CampinGazz wrote:
I'm about to order my radiators for the van, (Ultraheat do down to 200mm
wide rads, just waiting for a price) still waiting for the boiler
(eberspacher diesel fueled hot water furnace) to arrive, so whilst i'm
waiting i'm going to run the pipes for the radiators.
snip
problem i see is, how on earth do i stop the first radiator with a full open
flow valve allowing all the hot water to go through the rad and into the
return line, thus avoiding the water going round the rest of the pipework?

Balancing.
The other valve is turned down so that with all TRVs open, there is a
proportional flow to them all.

You can have a bypass valve, which operates when the pressure rises
above a threshold, and allows water flow through a loop round the pump.

"Ian Stirling" wrote in message
...
Balancing.
The other valve is turned down so that with all TRVs open, there is a
proportional flow to them all.

You can have a bypass valve, which operates when the pressure rises
above a threshold, and allows water flow through a loop round the pump.

Right.... i guess what i'm trying to get at now is.... the last rad on the
system, do i plumb the flow into the rad, return from the other side of the
rad? or loop the flow pipe around to become the return from the end of the
pipe run, and Tee the radiator off the pipe?

if i tee it off the pipe, the water will surely want to take the easier
route bypassing the rad as it's a shorter route, especialy when the TRV
starts to close.

if i run the flow into the rad, and the return starts from the outlet of
that last rad, then i fit the differential pressure valve between the last
rads inlet and outlet? as it's got a TRV on it, so if the other rads are all
shut off, and the last rad on the piperun shuts it's TRV, the diff valve
opens up and allows the coolant to run around the system unhindered?

In article , CampinGazz
writes
I'm about to order my radiators for the van, (Ultraheat do down to 200mm
wide rads, just waiting for a price) still waiting for the boiler
(eberspacher diesel fueled hot water furnace) to arrive, so whilst i'm
waiting i'm going to run the pipes for the radiators.

Who did you find to supply the Ultraheat rads?
--
fred
Plusnet - I hope you like vanilla

In article ,
fred writes:

Who did you find to supply the Ultraheat rads?

I got mine here, but they don't do mail order...

Dunstable Plumbing & Heating Merchants Ltd
137, High St North, Dunstable, Bedfordshire LU6 1JN
Tel: 01582 668893

I think they're made in Leighton Buzzard, which isn't
far from Dunstable. I don't know if you can buy direct
from the factory.

--
Andrew Gabriel

"fred" wrote in message ...
In article , CampinGazz
writes
I'm about to order my radiators for the van, (Ultraheat do down to 200mm
wide rads, just waiting for a price) still waiting for the boiler
(eberspacher diesel fueled hot water furnace) to arrive, so whilst i'm
waiting i'm going to run the pipes for the radiators.

Who did you find to supply the Ultraheat rads?

Well, tried plumb centre for a laugh, they basicaly told me they will only
sell me their own rads, and never even consider ordering any from another
company than the one they use... which dont do owt smaller than a 400 x 400,

so the only other plumbing merchants in town is graham, they said they'd be
more than happy to order them in for me, and i left it with them to get
prices... that was 2 days ago and they havent got back to me yet, so i'm
assuming i can get them, but as of yet i havent got the prices for them let
alone ordered them.