The V4073A Mid-position Diverter Valve should be used in conjunction with a room thermostat and cylinder thermostat to provide full temperature control of a conventional, fully pumped central heating installation. When used in this way, the control system is known as Sundial Y Plan and the components can be connected together using the Sundial Plan Wiring Centre which has dedicated terminations and there is no need for a wiring diagram.
An alternative method of wiring is to use the Honeywell 10-way Junction Box (42002116-002) together with the Honeywell Sundial Plans Wiring Booklet.
Features
Spring return action
Three position operation
Powerhead replaceable without draining down
Manual lever for filling/draining down
Quiet operation, minimal power consumption
Provides electrical output to boiler and/or pump
Options
22mm/28mm or 3/4", 1" connections
Replacement motor/powerhead/ball and 'O' ring kit
V4073 Motorised Zone Valve Ordering Specification
V4073A1039
22mm compression. 6.0 KV. Maximum close-off differential pressure 0.69 bar
V4073A1054
As above, but 3/4" BSP Female
V4073A1088
28mm compression. 8.1 KV. Maximum close-off differential pressure 0.55 bar
