ST699 contoroller replacement

[Colin68]

Hi All,

I tried to replace an old ST699 controller for a CT9400C but there's about 8 terminal connectors on the ST699 and 5 on the CT9400C, any advice for an alternative controller? .. current system is 'conventional and Y plan

 

[Barry98]

I use honeywells on y plan

 

[Colin68]

Yeah I want to use a CT9400C but unsure about the fitting (wiring) .. I have turned this sort of work down before as unsure but now need to bite the bullet and get the first success under my belt .. not sure how 8 wires go into 5 teminals ( on the CT9400C)

 

[Barry98]

i think i have a app for it on my ipad but her in doors has it at min with all there diagrams on

 

[Barry98]

https://itunes.apple.com/gb/app/wiring-guide-for-domestic/id482928504?mt=8

 

[Colin68]

many thanks I'll check it out

 

[Barry98]

no worries hope it helps

 

[Colin68]

thnaks Bod ... newly fitted ST9400C for the customer and he's happy .. even managed to discover the pump was wired incorrectly and running all the time even when there was no demand for hot water or heating .. don't suppose you know anything about SMC controllers do you?