Replacing Honeywell ST699B with a ST9400C

[philbramble]

Replacing a Honeywell ST 699B programmer with a new Honeywell ST699B .

However, current wiring as shown below:

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• philbramble
• 6 Jul 2011
• 1

New programmer only has 6 terminals

Untitled

• philbramble
• 6 Jul 2011
• 1

Can anybody advise on how I should rewire?

 

[picasso]

old prog............new prog

live..........to.......live

neutral....to........neutral

3............to.........4

6............to.........3

7............to.........1

you dont need the links on 8 and 4

 

[philbramble]

Perfect! Thanks for prompt response 'picasso'. I'll give it try and let you know if it works!

 

[philbramble]

Just fitted this weekend and worked first time!! )) easy when you know how. Thanks again![/b]

 

[bigalbie]

i read with interst this thread, as I want to do the same, to upgrade my 699 to a 9400 to allow me to use boost feature to save heating costs. but looking at the photo of the backplate, I notice that i have no wire on the no7 terminal. is that normal, its one of the HW terminals. my heating and water timing works OK at the moment btw.

will wiring in the new unit but with no wire to 1 still work?

grateful for any help

 

[stem]

The hot water "off" signal is used with "Y Plan" systems which have a single three port motorised valve. Yours is likely an "S Plan" system which has 2 or more two port valves. The hot water off signal is not required with this configuration.

If yours is an "S Plan" then all is well.

Welcome to the forum bigalbie. For future reference it's best to start your own thread with a new question. Adding your question to an existing thread is known as "hijacking"

 

[bigalbie]

THanks to Stem and apologies for hijacking, sounds bad...... just seemed sensible to follow the theme but thanks for putting me right.
A