The Drayton ZA5 is a genuine replacement 5-wire zone valve actuator for Drayton's ZA5/679 range of 22mm 2-port and 3-port motorised valves. It uses Drayton's "snap-on" fitting system, so the whole actuator head lifts straight off the valve body at the push of a release button — no tools, no re-plumbing, and no need to drain and refit compression fittings. If your existing ZA5 actuator has failed, seized, or is triggering a "no heat" or "no hot water" fault, this part restores the valve to full working order in minutes.
It's built to the same 230V, 5-watt specification as the original equipment, carries a 3(1)A SPST auxiliary switch for boiler interlock wiring, and retains the manual lever with valve position indicator so the valve can be opened by hand for filling, draining, or diagnosing a system fault.
14s / 6s
Open / spring-return
8.6 bar
Max static pressure
Check before ordering: This is a 5-wire, 230V, SPST actuator for the Drayton ZA5/679 22mm 2-port and 3-port diverter valve bodies. It is not interchangeable with the 6-wire ZA6 (SPDT, for 28mm ZA6/779 valves) or with the 24V ZA5A variant. Confirm the valve body model and voltage stamped on your existing actuator before fitting a replacement.
Snap-On Fitting
The actuator releases at the push of a button and lifts clear of the valve body — no draining or unsoldering the pipework to swap it out.
100% Tight Shut-Off
Spring-return action drives the valve fully closed when de-energised, giving a complete, drip-free shut-off rather than a partial close.
Manual Lever & Indicator
A built-in manual override lever with visible valve position indicator lets you open the valve by hand and see its status at a glance.
SPST Auxiliary Switch
The integral 3(1)A SPST switch provides the boiler interlock signal, following the same industry-standard 5-wire colour code as the original actuator.
Replaceable Motor
Internal components including the motor pack are individually serviceable, extending the working life of the actuator beyond a single fault.
Direct OE Replacement
Matches the original equipment specification exactly, so no rewiring, recalibration, or valve body changes are needed.
Technical Specification
Manufacturer part code
27650
Compatible valve bodies
ZA5/679-2 (22mm 2-port), ZA5/679-3 (22mm 3-port diverter)
Wiring
5-wire, industry-standard colour code
Switch rating
3(1)A, 230V AC
Operating voltage
230V AC, 50Hz
Valve operation
Energise to open; spring return to close
Operating time
14 seconds motor-driven open; 6 seconds spring-return close
Maximum static pressure
8.6 bar
Water temperature range
2°C to 93°C
Maximum ambient temperature
52°C
System fuse rating
3A minimum
Cable length
1m (not field replaceable)
Fitting type
Snap-on / push-button release
Manual override
Yes, with valve position indicator
Important: This is a mains 230V electrical component. Wiring must be carried out by a competent electrician in accordance with BS 7671 current IET regulations, the valve must be correctly earthed, and the electrical supply must be isolated before fitting or removing the actuator. Do not attach the actuator until the valve body has been fitted and all pipework connections are complete.
Frequently Asked Questions
Which valves is the Drayton ZA5 actuator compatible with?
The ZA5 (27650) fits the Drayton ZA5/679 22mm 2-port zone valve and the Drayton ZA5/679 22mm 3-port diverter valve. It is not compatible with the 28mm ZA6/779 range, which uses a 6-wire SPDT actuator instead.
Do I need to drain the system to replace the actuator?
No. Thanks to Drayton's snap-on design, the actuator lifts off the valve body independently of the pipework once the electrical supply is isolated and the wiring is disconnected. The valve body and compression fittings stay in place.
Can I fit this actuator myself?
The mechanical fitting is straightforward, but the electrical connection must be made by a competent electrician in line with BS 7671 IET wiring regulations, since this is a mains 230V component that also carries a boiler interlock switch circuit.
What does the SPST auxiliary switch do?
The SPST switch signals the boiler once the valve has driven fully open, forming part of the boiler interlock so the boiler only fires when there's an open path for heated water to flow.
