Hi to all i have fitted an outdoor shower the pipework is 22 for hot &15 cold the cold works fine but hot is just a bit more than a trickle I have taken it apart there is nothing blocking the flow so im assuming there must be an airlock any ideas as to how to shift them thank you in advance.
outdoor shower
- Thread starter thespecialone
- Start date
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L
longdogs
Assuming you have a vented system with a tank and a cylinder: If it's an airlock, you need to force mains water up the hot pipe. Have you tried it without the shower connected? Is the cold feed from the tank or from the mains? Does any of the hot pipework run up then down like an inverted V?
hi the hot pipe runs down then horizontal yes i have tried it with the shower connected the cold feed is from the mains thank you for your response
L
longdogs
Just to clarify: both hot and cold should be equal pressures. Either:
Cold from tank & hot from tank via the cylinder
or Cold from mains and hot from combi
If you have both mains pressures it's unlikely you would get an airlock.
Are the pipes connected to the shower the correct way round?
Cold from tank & hot from tank via the cylinder
or Cold from mains and hot from combi
If you have both mains pressures it's unlikely you would get an airlock.
Are the pipes connected to the shower the correct way round?
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hi yes the pipes are connected the correct way round from what your saying i have got to plumb the cold from the cold tank do i have to use 22 same as hot pipe or can i use 15?
L
longdogs
I would use 22mm to keep the two supplies even.
have a read of this, it might be useful:
http://www.mirashowers.co.uk/inspiration/planning/watersystems.htm
What seems to be happening with your shower is that the pressure of the mains cold water is forcing the hot low pressure water back up the pipe, so the cold is winning.
from what you say, you have run the hot without the valve and it's ok so it's not an airlock.
one more question: When the valve is connected, what is the hot flow like then (without the cold turned on)? Could there be a problem with the hot valve?
have a read of this, it might be useful:
http://www.mirashowers.co.uk/inspiration/planning/watersystems.htm
What seems to be happening with your shower is that the pressure of the mains cold water is forcing the hot low pressure water back up the pipe, so the cold is winning.
from what you say, you have run the hot without the valve and it's ok so it's not an airlock.
one more question: When the valve is connected, what is the hot flow like then (without the cold turned on)? Could there be a problem with the hot valve?
this is a woodford outdoor shower that does not freeze it has like a mixer valve in the middle the seats are at the end of tubes about 8" long sorry 200mm to you and the taps washers on the end of rods about 200mm long the hot flow on its own is poor & does not lift the valve in the centre on its own but the cold does and has good flow Hope this make sense
Reading exactly what you have said there is a problem with the flow from the hot tank which is sourced from a loft tank with a potential pressure of about 0.5 bar.
It seems there is an airlock in the hot supply.
As suggested, you need to force a little cold water into the hot supply pipe.
The cold should be balanced pressure but rather than running new pipe work it would be easier to use a pressure reducing valve on the cold supply.
Tony
It seems there is an airlock in the hot supply.
As suggested, you need to force a little cold water into the hot supply pipe.
The cold should be balanced pressure but rather than running new pipe work it would be easier to use a pressure reducing valve on the cold supply.
Tony
Hi tony i tried to force cold in to the hot pipe by sealing the outlet and opening both taps but still no improvement i left it like this all night. i will try your suggestion and let you know how i get on thank you for your response
You should never leave it like that for more than a few seconds in case it causes the cold tank level to rise and not be emptied by the warning ( overflow ) pipe.
The shower probably has a non return valve built in which will prevent the backflow you need.
You MIGHT be able to suck on the hot.
Otherwise you will probably need to take shower unit off.
But are you sure the connection to the loft tank is turned on and not blocked and any gate valves are not broken or just the inlet blocked. An engineer I sent to a job once found a ( dead ) mouse blocking a cold feed pipe!
Tony
The shower probably has a non return valve built in which will prevent the backflow you need.
You MIGHT be able to suck on the hot.
Otherwise you will probably need to take shower unit off.
But are you sure the connection to the loft tank is turned on and not blocked and any gate valves are not broken or just the inlet blocked. An engineer I sent to a job once found a ( dead ) mouse blocking a cold feed pipe!
Tony
To be honest it would make more sense with the occassional full stop.
L
longdogs
True but its the hot which isn't working which should be taken from the cylinder. If the feed from the tank was blocked he would have no hot water anywhere.
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