I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main signal.

If it were LV could do it easy with an RC circuit, but this is all 220Vac


Can you get relays with a built in delay ? (220V coil)

I could create a LV supply and timer cct but wondered if there was a
simpler way.

On Thu, 30 Jun 2016 14:30:29 +0100, rick
wrote:

I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main signal.

If it were LV could do it easy with an RC circuit, but this is all 220Vac


Can you get relays with a built in delay ? (220V coil)

I could create a LV supply and timer cct but wondered if there was a
simpler way.


555 timer driving a solid-state relay, or 555 timer driving a bipolar
transistor driving a conventional relay



--

Graham.

%Profound_observation%

On 30/06/2016 14:30, rick wrote:
I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main signal.

If it were LV could do it easy with an RC circuit, but this is all 220Vac


Can you get relays with a built in delay ? (220V coil)

I could create a LV supply and timer cct but wondered if there was a
simpler way.

Time Delay Relays are common - £20 upwards - look at RS components or
I'm sure many others.

Cheers
--
Syd

On 30/06/16 14:40, Graham. wrote:
On Thu, 30 Jun 2016 14:30:29 +0100, rick
wrote:

I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main signal.

If it were LV could do it easy with an RC circuit, but this is all 220Vac


Can you get relays with a built in delay ? (220V coil)

NTC thermistor perhaps?

THere's a few ways that involve thermal mass instead of a capacitor to
create a delay.




--
Ideas are more powerful than guns. We would not let our enemies have
guns, why should we let them have ideas?

Josef Stalin

On 30/06/2016 14:30, rick wrote:
I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main signal.

If it were LV could do it easy with an RC circuit, but this is all 220Vac


Can you get relays with a built in delay ? (220V coil)

I could create a LV supply and timer cct but wondered if there was a
simpler way.

There are loads of different timer relays in the CPC and RS books (for
instance). Many are multifunction. I don't think there's any permutation
that can't be done. You want one called 'on delay'.

From the manual for a gadget I made last year:

"On delay relay (Relay 4). When the external supply comes on it is
connected to Relay 5 after a delay. When the external supply goes off it
is disconnected immediately."

Bill

On 6/30/2016 2:40 PM, Graham. wrote:
On Thu, 30 Jun 2016 14:30:29 +0100, rick


555 timer driving a solid-state relay, or 555 timer driving a bipolar
transistor driving a conventional relay



Agree but then need LV to power the 555 as explained trying to do
this all in 220V ac


I just found this item ....http://tinyurl.com/zcysnje

anybody used these, may do what I need

On 6/30/2016 2:58 PM, Bill Wright wrote:
On 30/06/2016 14:30, rick wrote:
I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main
signal.

If it were LV could do it easy with an RC circuit, but this is all 220Vac


Can you get relays with a built in delay ? (220V coil)

I could create a LV supply and timer cct but wondered if there was a
simpler way.

There are loads of different timer relays in the CPC and RS books (for
instance). Many are multifunction. I don't think there's any permutation
that can't be done. You want one called 'on delay'.

From the manual for a gadget I made last year:

"On delay relay (Relay 4). When the external supply comes on it is
connected to Relay 5 after a delay. When the external supply goes off it
is disconnected immediately."

Bill


So this thing http://tinyurl.com/zcysnje

is likely to be what I need ... cheap enough

On 30/06/16 15:33, rick wrote:
On 6/30/2016 2:58 PM, Bill Wright wrote:
On 30/06/2016 14:30, rick wrote:
I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main
signal.

If it were LV could do it easy with an RC circuit, but this is all
220Vac


Can you get relays with a built in delay ? (220V coil)

I could create a LV supply and timer cct but wondered if there was a
simpler way.

There are loads of different timer relays in the CPC and RS books (for
instance). Many are multifunction. I don't think there's any permutation
that can't be done. You want one called 'on delay'.

From the manual for a gadget I made last year:

"On delay relay (Relay 4). When the external supply comes on it is
connected to Relay 5 after a delay. When the external supply goes off it
is disconnected immediately."

Bill


So this thing http://tinyurl.com/zcysnje

is likely to be what I need ... cheap enough
That looks alike a LV coil and AC contacts.

Is that what you wanted?


--
"Socialist governments traditionally do make a financial mess. They
always run out of other people's money. It's quite a characteristic of them"

Margaret Thatcher

On Thursday, 30 June 2016 14:30:37 UTC+1, rick wrote:
I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main signal.

there are several. Provide more detail.


NT

On 30/06/2016 15:33, rick wrote:

So this thing http://tinyurl.com/zcysnje

is likely to be what I need ... cheap enough

Yes except it only has a series of fixed delays rather than infinitely
variable.

Bill

On 30/06/2016 17:59, The Natural Philosopher wrote:

is likely to be what I need ... cheap enough
That looks alike a LV coil and AC contacts.

Is that what you wanted?


No the illustrated one says it has a 220V coil. Personally I'd want one
that was 235V if it's going to be activated for long periods.

Bill

Bill Wright wrote:
On 30/06/2016 17:59, The Natural Philosopher wrote:

is likely to be what I need ... cheap enough
That looks alike a LV coil and AC contacts.

Is that what you wanted?


No the illustrated one says it has a 220V coil. Personally I'd want one
that was 235V if it's going to be activated for long periods.

I thought it was only going to be activated whilst the hot water was
running? Does that qualify as "long periods"?

Tim

--
Trolls AND TROLL FEEDERS all go in my kill file

On Friday, 1 July 2016 08:38:46 UTC+1, Tim+ wrote:
I thought it was only going to be activated whilst the hot water was
running? Does that qualify as "long periods"?

I suppose it depends on teenage daughters.

Or sons, these days.

Owain

On 7/1/2016 12:50 AM, wrote:
On Thursday, 30 June 2016 14:30:37 UTC+1, rick wrote:
I have a flow switch providing detection of DHW draw off.

I want it to operate a pump ... but not straight away (i.e. small am
mount of DHW drawn off) anybody know a simple way to delay a main signal.

there are several. Provide more detail.


NT


#
Ordered one of the ones I listed ... only a £5
They use an OMRON timer which are well used
I ordered a 200-230vAC coil with 5A contacts