Central heating questions for rented property

[SydShaw]

Hi everyone, I'm renting a house from family and have some questions about the central heating system, boiler is a biasi Riva compact HE and radiators have old danfoss valves on them (see images), I have an issue getting the system temperature just right, currently the radiators are too hot so here are my questions:

1. Is the C.H adjustment knob on the boiler set correctly? The manual says if boiler is used for hot water and heating then this is correct setting

2. What should the radiator thermostats be set too? Are these markings relating to how hot I want the room to be?

3. To explain why certain rads shut off automatically say 30 mins after I turn heating on, Can these valves shut off automatically once a certain temperature is reached? (There's no wall thermostat)

Many thanks!

 

[cross thread]

no boiler stat up around 10 past

 

[SydShaw]

Also, any idea why if I switch the rad stats from III to II, the rads are no longer hot?

 

[muggles]

Also, any idea why if I switch the rad stats from III to II, the rads are no longer hot?

Because the stat is up to temperature and has shut off the radiator to prevent the room getting hotter.

 

[SydShaw]

Thanks muggles, this one has no stat on it, am I able to "turn it down" or even off?

 

[cross thread]

leave one on it acts as a by pass

 

[SydShaw]

 

[SydShaw]

leave one on it acts as a by pass

Sorry I don't understand that, do you mean I should leave the one without a stat on?

 

[cross thread]

yes

 

[ianmcd]

That last pic is a thermostatic valve just the sensor head has been removed

 

[SydShaw]

Thanks chaps, I have another question, if I set the valves to II, the rads heat up then cool down again, as explained above however they then do not heat back up again at all, even if the boiler is running But, if I turn the valves to III, if I remember correctly they then stay on until I manually turn the system off via the boiler??

 

[Madrab]

The valves on the rads are controlled by the heat in the room and the setting the valves are at and not by the temp on the boiler. If the vcalves are set higher they'll stay open until the room is warmer, lower down then they'll shut off at a cooler room temp.

Read this
http://heating.danfoss.com/PCMPDF/013R9355_RAS_C2_CEN_VISXM202_.pdf