how can the hot water tank heat up when CH is off?

[barnies]

Hello,

We just got a new heating system installed, its called a sealed system i think?? but we have to valves marked "CH" and "HW" but in the hot water tank in the cupboard is only a coil inside the tank i assume is it?

what does the "HW" switch on the programmer do when it is switched on and the "CH" is off, i thought the "CH" switch had to be on for it to heat up the tank with coil being on the with radiators is that correct??

I aint a plumber expert just was wondering how it worked, also the boiler only two pipes coming out of it so didnt know how it worked?

Any help would be nice.

Thanks.

 

[Hugh Jaleak]

You should have one or two motorised valves. These control the flow of water from the boiler, allowing it to flow to the HW cylinder, radiators or both as required by timeclock and thermostats.

 

[barnies]

You should have one or two motorised valves. These control the flow of water from the boiler, allowing it to flow to the HW cylinder, radiators or both as required by timeclock and thermostats.

yea we have two motorized marked CH and HW, but when the HW is the only switched on does the coil which is part of the CH system does it get switched on to heat the tank up or what?

I dont know how it works like could somebody explain please

thanks.

 

[electronicsuk]

The coil and CH are two separate zones controlled by 2-port valves, or so would seem to be the case here. Heating the cylinder coil does not mean that the radiators need to be on, and vice versa.

 

[barnies]

The coil and CH are two separate zones controlled by 2-port valves, or so would seem to be the case here. Heating the cylinder coil does not mean that the radiators need to be on, and vice versa.

We only have to valves though so where would that 2-port valve be?
ok so when the HW switch is on and the CH is off does the water get heated up by the coil, but this is done by a 2port valve yea?

 

[xr4x4]

It's quite simple, when the CH is on, the boiler heats up the rads for heating only.

When the HW is on the boiler heats up the hot water tank for your hot water only.

Both can work independently, or at the same time. Depending on how the timer is set and the thermostats.

 

[electronicsuk]

The coil and CH are two separate zones controlled by 2-port valves, or so would seem to be the case here. Heating the cylinder coil does not mean that the radiators need to be on, and vice versa.

We only have to valves though so where would that 2-port valve be?

And each valve has an in and an out port, yes? They wouldn't be much use if they only had a single port.

ok so when the HW switch is on and the CH is off does the water get heated up by the coil, but this is done by a 2port valve yea?

Pretty much. The valves are effectively just electrically controlled taps, allowing the programmer to control whether the hot water in the system gets directed to the radiators, cylinder coil or both.

 

[barnies]

It's quite simple, when the CH is on, the boiler heats up the rads for heating only.

When the HW is on the boiler heats up the hot water tank for your hot water only.

Both can work independently, or at the same time. Depending on how the timer is set and the thermostats.

yea i understand that, but i thought that the coil inside the cylinder is part of the CH system and not the HW system how can the HW cylinder heat up if the coil is on CH side?

 

[electronicsuk]

yea i understand that, but i thought that the coil inside the cylinder is part of the CH system and not the HW system how can the HW cylinder heat up if the coil is on CH side?

It is part of the central heating system, because CH comprises many things besides radiators. The cylinder coil, radiators, pipework and boiler are ALL parts of the central heating system.

 

[barnies]

sorry folks for all this,

so from the beginning the HW is switched on yea, this will open the HW valve which then goes where??? does it go to some other valve to get the Coil?

and when the CH is switched on does it heat up the coil at the same when CH is switched on

I just dont know much really about plumbing.

sorry

 

[electronicsuk]

Read through all the posts in this thread and you'll see that all your questions have already been answered. If you still don't understand, it's probably best just to accept that it works, and there's no need for you to worry about it.

 

[xr4x4]

Central heating is a circuit, boiler has a hot out and a cold in.

On the out hot pipe there are valves, one to the rads and one to the hot water cylinder, then return back to the boiler to be reheated.

Each one opens as it's needed.

You can also have a 3 port valve, which does the same as 2 2 port valves in one unit.

 

[barnies]

ah so the cylinder coil is the HW yea?

when the hw is on the water is fed directly to coil yea?

 

[barnies]

Central heating is a circuit, boiler has a hot out and a cold in.

On the out hot pipe there are valves, one to the rads and one to the hot water cylinder, then return back to the boiler to be reheated.

Each one opens as it's needed.

You can also have a 3 port valve, which does the same as 2 2 port valves in one unit.

yea so the hot out pipe goes to the first valve, and splits to second valve yea?and then they both go to the rads and the tank coil yea?

and on the return do they join back up together is this correct?

 

[barnies]

ah so the cylinder coil is the HW yea?

when the hw is on the water is fed directly to coil yea?