replacing swithmaster 300
- Thread starter Lucas29
- Start date
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No, your switch master is a 24 hour progrmmer and the Hortmann centuarplus c17 is 7 day 2 channel programmer. You need the Hortmann
centuar SC1 or Centuarplus C11 for a direct replacement
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I just bought C17 and how can i replace it with switchmaster 300 ?
Switchmaster 300 was conect :
N
L
1
3
C17 connect
N
L
2
4
The switch master has only two connections 4 = common, 1 = on.
The C17 has three connections, 2 = common, 4 = on, 3 = off.
The switch master 300 is a current model but the C17 is a discontinued competitors model. Hopimg this answers your query.
spraggo
Is your old switchmaster wired for voltage free contacts, ie, with no links between L - 4 and N - 2, which would be normal for controlling Combi boilers in most cases. If this is not the case and the 300 is connected in this way then the c17 should be wired with links between L - 2 and N -4. The wire removed from slot 1 on the 300 should be connected 4 on the c17, and the wire removed from 3 on the 300 should be connected to 2 on the c17. It seems strange that the wire on the 300 was connected to slot 3 as this is the OFF contact, whereas if it were connected to No 4 would make sense as this is the ON contact.
On Switchmaster was links between L - 4 and N - 2.
So it should be on the C17 ?
I must be sure. I'm sorry but I'm not too good in electrical engineering.
Is it possible for you to state how many wires are present at the backplate of the 300 other than the live neutral and earth, what colour they are and what type of boiler the time clock is controlling, so that we can make sure you connect up correctly. Also is there a room stat fitted
Connect L N E to c17 as on the 300, and then on c17 Connect N - 1 and L - 2 with links. Connect black to 4,(Sw L ON) and yellow to 1,(N). 3 is Sw L OFF
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