fire alarm help

[edclark46]

Hi,

Does anyone know of a good replacement for the following smoke alarms (pic attached) can't seem to find a like for like.

thanks.

 

[tazz]

Apollo S65 will work fine, just make sure you get the red cables the correct way round, L1in / L1out....connect both black cables to L2, the measure voltage across L2 to each red wire, the red cable showing 27v dc connects to L1in.

 

[edclark46]

Thanks. I tried to replace it with this cooper cdb300 but it kept showing fault on the panel? any idea why this would be i tried various wiring combinations but kept showing fault.

 

[tazz]

The menvier range use negative head removal detection, hence the diode is on the negative side (between 1 & 2) so not really suited to normal conventional panels