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- 5 Jan 2017
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I am having some issues swapping from an old 24 hour mechanical programmer to a new 7 day programmer.
The old programmer is a siemens RWB2E
and the new programmer is a Drayton LP722
The issue I have is with the wiring. (we have just had a full re-wire done and apparently none of the central heating system was included in this. Normal practice?)
currently the pins on the back plate that are in use are N,L, 3 and 4. and the controller has this diagram on the back
The new programmer has this on the back
my understanding was that i needed to use pin 2 and pin 4 to allow me to switch on and off however with pin 4 where it is and the previous pin 3 moved to two all i get is the central heating pump turning on and the boiler won't ignite. reversing them ignites the boiler but leaves the pump off.
would this suggest that both need to be on pin 4?, in which case how would the off signal work? Unfortunately I don't know what the layout is but I have an old Honeywell room thermostat as well.
The boiler I have is very old ideal mexico system boiler which I am being told I cannot heat DHW separate from CH. This is fine if a little annoying as I am saving for a new boiler but is this correct?
Apologies home electrics and central heating systems are completely new to me, (first house) so any and all help would be very much appreciated!
Thanks!
The old programmer is a siemens RWB2E
and the new programmer is a Drayton LP722
The issue I have is with the wiring. (we have just had a full re-wire done and apparently none of the central heating system was included in this. Normal practice?)
currently the pins on the back plate that are in use are N,L, 3 and 4. and the controller has this diagram on the back
The new programmer has this on the back
my understanding was that i needed to use pin 2 and pin 4 to allow me to switch on and off however with pin 4 where it is and the previous pin 3 moved to two all i get is the central heating pump turning on and the boiler won't ignite. reversing them ignites the boiler but leaves the pump off.
would this suggest that both need to be on pin 4?, in which case how would the off signal work? Unfortunately I don't know what the layout is but I have an old Honeywell room thermostat as well.
The boiler I have is very old ideal mexico system boiler which I am being told I cannot heat DHW separate from CH. This is fine if a little annoying as I am saving for a new boiler but is this correct?
Apologies home electrics and central heating systems are completely new to me, (first house) so any and all help would be very much appreciated!
Thanks!