Old heating/water controls - switchmaster 900

[Paladin2019]

Hi all

I've recently moved into a rented property with a Switchmaster 900 heating and water control system. Unfortunately neither the landlord nor myself have any idea how to program it. It has a clock dial (with no indication as to where the "now" time is), four coloured pins (red, green, yellow, blue), and an Advance dial with colours corresponding to the four pins.

I don't want to have to keep using the off and constant settings.

A forum search reveals that some people have asked similar questions before but nobody has actually explained the ins and outs of programing this thing. Any help would be greatly appreciated. Thanks

 

[D_Hailsham]

I've recently moved into a rented property with a Switchmaster 900 heating and water control system. Unfortunately neither the landlord nor myself have any idea how to program it. It has a clock dial (with no indication as to where the "now" time is), four coloured pins (red, green, yellow, blue), and an Advance dial with colours corresponding to the four pins.

A forum search reveals that some people have asked similar questions before but nobody has actually explained the ins and outs of programing this thing.

Did you find this one? //www.diynot.com/forums/viewtopic.php?t=25085

 

[Paladin2019]

Yes. It doesn't say how to set the time, what the pins do, or what the advance knob does. Which is why I asked here.

 

[D_Hailsham]

Untitled

• D_Hailsham
• 26 May 2009
• 1

You set the time by rotating the main dial clockwise so the correct time is against the mark near the Advance knob.

The four coloured markers are ON, OFF, ON OFF. You can move the markers by pulling them out (away from the centre) sliding them round the dial then pushing in again. This allows you to have two periods when the heating/ hot water are on. (You will have to experiment to find out what each marker does but the will always be in the order: On, Off, On, Off.)

The slide switches allow you to override the marker settings:

Constant means the heating/hot water is on 24 hours a day

Once that is goes on at the first marker and off at the last, i.e ignores the two intermediate markers.

Twice means it goes on at the first marker, off at the second, on at the third and off at the fourth.

Off means it is off all the time.

The advance knob allows you to temporarily override the setting. So, if the heating/ hot water has just gone off and you want to bring it back on again, e.g for a late night party, you just turn the advance knob anticlockwise until it clicks and the boiler will come on. It will then stay on until the next schedule ON time. You can turn it off again by turning the knob anticlockwise until it clicks.

Similarly, if the boiler is ON and you want to turn it OFF, e.g going out for the day, you can turn the knob clockwise which will turn the boiler off and stay off until the next scheduled ON time.

 

[Paladin2019]

Thanks, that's exactly what I needed

All set up and ready to go now!