Weekend challenge - fun time

[butternut]

Here is the scenario.... you have to make this boiler modulate and purge (to at least 100 degrees or less)for under $.

The boiler pictured has a cold start control from the factory. GO!



You can use anything you want and modify anything you want as long as you stay at or below $. wholesale in parts.

(if this isnt allowed please delete)

[dandyme]

are you asking what is needed to accomplish your task?

if so; you may be pushing the envelope of this open forum.

[butternut]

are you asking what is needed to accomplish your task?

if so; you may be pushing the envelope of this open forum.

Yes I am ...not my task... the task
And ... Am I?
(obviously not talking modulating fire rate)

[butternut]

49 views and still nothing?. I assume that you are checking it twice and seeing what is naughty or nice?.

[ammoniadog]

Call somebody else

Seriously though, what do you mean by modulate and purge? Are you talking about a primary/secondary setup where the primary maintains a steady temperature while the secondary modulates somehow? Does purge mean an auto air vent? Is labor and piping materials included in your price? Does everything have to be automatic, or can we have some guy stand there operating manual "modulate" and "purge" valves?

[2sac]

can we have some guy stand there operating manual "modulate" and "purge" valves?

I'm up for the task

[butternut]

Does everything have to be automatic, or can we have some guy stand there operating manual "modulate" and "purge" valves?

LOL!~I scared the cat half to death with the snarf I made when I read this Beer all over the floor...which I have to clean up now

Seriously though, what do you mean by modulate and purge? Are you talking about a primary/secondary setup where the primary maintains a steady temperature while the secondary modulates somehow? Does purge mean an auto air vent? Is labor and piping materials included in your price?

Modulate the out going water at a set temp (lets say whatever you like between 140 and 180) and then purging the remaining water out of the boiler after the call is satisfied.
Reason for doing this is to bring the boiler to temp fast without chilling the element or causing the boiler to shock and then getting all the water top side after the stat is satisfied, rather than losing it to standby.
Material only

[DeltaT]

Place someone next to the boiler with his/her hand on the on/off switch and a thermometer & turn it on. When the thing, whatever your are measuring) reaches 110 degrees have that person turn off the on/off switch.

[butternut]

The rest of you are just as funny... HAHAHA

[beenthere]

Weil McLain BCP 3. Its simple fast and easy.

It will run the circ anytime the outdoor temp is below the heating point, and regulate boiler temp based on outdoor temp.

Won't bring the water temp up fast, as what purging the boiler is counter productive to doing that.

[butternut]

Weil McLain BCP 3. Its simple fast and easy.

It will run the circ anytime the outdoor temp is below the heating point, and regulate boiler temp based on outdoor temp.

Looks like a Logomatic. Is it cheaper than the logomatic?.

[beenthere]

Looks like a Logomatic. Is it cheaper than the logomatic?.

Don't know, don't know what a logomatic cost.


And since this is an open forum, prices aren't allowed.

[junkhound]

Merry Christmas all.

Anytime pulse modulation is discussed I think voltage regulators as that was a big part of my previous day job. I

In this case a TI UC1825 pulse width modulator chip, a few resistors and capacitors and thermistors and you have a state of the art control. Use the UC1825 to control the boiler on-off functions, and instead of the feedback circuit regulating on a voltage, use the thermistors as the control element. Since the 1825 is a current mode device, you can use that inner control loop for a continuous operation type control with the inner control loop running an inverter driving a variable speed pump. Thus burner almost never turns completely off, just the fuel and water flow are regulated in a pulse width modulation scheme.

OP probably wanted something to buy off the shelf though, eh?, not a design tutorial?