Ideal classic Room stat

DublinDilbert

hi all,

I have an ideal classic se15 boiler.

I assume it's ok to wire a room stat (in hallway) on power supply to boiler? This will control both the boiler and pump in the shed.

Is ok? Or is there a prefered way of controlling these ? (eg connecting some sort of stat directly to the boiler?)

Thanks

glynf

DublinDilbert wrote: »

hi all,

I have an ideal classic se15 boiler.

I assume it's ok to wire a room stat (in hallway) on power supply to boiler? This will control both the boiler and pump in the shed.

Is ok? Or is there a prefered way of controlling these ? (eg connecting some sort of stat directly to the boiler?)

Thanks

Hi,

You can download thre manual for your bolier here:

Click on Installation & servicing for a prompt to dl the pdf. If you look on page 24 (christ, I remind myself of a teacher I had:eek:), section 39 it says its ok to wire the timeclock in series withe the mains supply.

I assume you have a timeclock & maybe zone valve(s)? I suggest wiring the system up as per section 41 or 42 depending on the valve(s) and make sure you can isolate the permanent supply to the boiler by a double pole 20A beside it.

DublinDilbert

Hi,

Thanks for the reply.

I already have a time clock wired in, I want to wire a room stat in series with this so once the hall gets above say 20c, it will knock off the boiler/pump, till it drops back down again.

I assume it's ok to cycle the boiler / pump like this? Or should I keep the pump running constantly and just cycle the power to the boiler?

glynf

DublinDilbert wrote: »

Hi,

Thanks for the reply.

I already have a time clock wired in, I want to wire a room stat in series with this so once the hall gets above say 20c, it will knock off the boiler/pump, till it drops back down again.

I assume it's ok to cycle the boiler / pump like this? Or should I keep the pump running constantly and just cycle the power to the boiler?

Is ok to wire the stat normaly closed in series with the heating channel from the time clock. Iirc you must keep a permanent supply at the boiler-as the pump (if powered/controlled by the boiler)may need to run on to dissipate heat etc.

Please confirm with someone here more up to speed with boilers.

DublinDilbert

This boiler doesn't have a 'run' on feature, as the pump is just wired in parallel with the boiler.

I'll just wire in the room stat like that.

Wanted just to check in here, incase there was some reason not to do this with this boiler....

DGOBS

The fact the heat exchanger is a large(ish) cast iron one there is no need for over run (in saying that, why is the fan always join on these boilers....residual heat is why!)

DublinDilbert

Hi All,

I fitted that thermostat, set it to the max of 1 degree hysteriss.

It's roughly cycling the boiler @ 8 mins on / 8 mins off this evening, when the house got up to temp. Is this switching the boiler/pump on/off too much?

I have the option of putting in a time-off relay, which will allow the system run on for a settable amount of time after the thermostat turns off. So it could be set for 5 mins, so i should in theory get 15mins on / off cycle?

Am I over thinking this? or is switching on / off every 8 mins ok?

Thanks

glynf

Hi,

It seems a bit much. Instead of complicating things with a delay off relay, a thermostat with an adjustable deadband would work much better-set it 1-2 degrees either side of your setpoint.

The last time I used similar was a Honeywell Fan coil unit controller.

verycrazy

Everything you have dine is fine. Ideal classic does not require permanent live( for pump over run) and yes after reaching temp coming on / off when you said is ok. The times vary on system size etc.

DublinDilbert

Thanks guys. I'm surprised there isn't more info out there on the Internet. I'm not too familiar with boilers so just wanted to check with the experts.

It seems to be working well, it's the mothers house and it was getting far too hot, even with trv's installed.

I've set the dead band for the max (1C). I've the pid jumper on, I might try it in on/off mode and see what it cycles like.