Drayton (ACL) ZA6/779-2 28mm Zone Valve
ZA6/779-2 (Zone Valve) 28mm 2 port
Drayton motorised valves now feature removable actuators which simplify installation and future servicing.
No tools are required to fit the actuator to the body as it simply clicks into place.
To remove just press the release button and lift the actuator from the body.
Replaces (Same wiring dimensions and thread for a direct swap) for:
ACL Drayton Lifestyle 779H335-30L10
Drayton part number 27205
If it is actuator only needed, then the TAM4 is a direct replacement for the TAM2: https://www.heatingcontrolsonline.co.uk/acl-drayton-invensys-tam4-3-position-actuator-p-113.html
That's correct. You would need to change the body was well. However the dimensions and thread are the same - so no pipework alterations are needed.
If you have the old "lifestyle" model then no, you will need to replace the whole valve. If you have the newer ZA6 model, then you can replace just the actuator (grey box).
Yes it does.
As long as the valve body it 28mm, then it will be a straight swap.
No, you will need to replace the whole valve. The old Lifestyle valves had a non-replaceable head.