On Sun, 21 May 2006 12:41:31 +0100, Doctor Drivel wrote
(in article ews.net):


Matt, how does your boiler model know
that DHW is calling if fitted with
either a stat or temp sensor?

There is a setting on the controller in
the boiler to select whether the DHW
demand sensing is by a contact closure
(i.e. thermostat) or a temperature
sensor.

When a stat detects DHW is calling
the boiler just then runs up to what the
maximum temperature the boiler is set at?

Exactly.

Demand sensing - this will be a
DHW setpoint (cylinder temp) set at
the boiler. Below and the boiler runs up
the the max boiler temp set?

Yes again.

There is a similar one for CH control
where the sensing is between thermostat
contact, a PWM signal from a Siemens or
other controller or 0-10 or 0-3v analogue control.

External control which incorporates
the burner modualtion rather than
on-off.

Yep. (You're getting good at this :-) )

You should learn how to describe what it does. :-(


I was trying to keep it simple so that you would understand.