I N S TA L L AT I O N
INSTRUCTIONS
Application
The V4073A valve has been designed to control the flow of
water in a small bore domestic central heating system where
both radiator and hot water cylinder circulation are pumped.
It is typically suited for systems up to 90,000 Btu/h (26 KW).
V4073A Motorised Mid-Position Valve
Specifications
Voltage: 230-240V ~ 50Hz
Power consumption: 6W
Lead supplied: 1 metre, 5 core
Operating temperature range: +5 to +88擄C
(Special models available for chilled water applications)
Maximum ambient temperature: +52擄C
Pipe fitting sizes:
22mm & 28mm compression fitting,
3
/
4
" & 1" BSP
Dimensions and KV values: See diagrams
Spares available
Powerhead
Motor
Ball & 鈥極鈥?Ring Kit
Part No. 40003916-003
Part No. 40002737-003
Part No. 272742A CARD
Installation
V4073A incorporates a manual
lever, the lever should normally
be in 鈥楢UTO鈥?position, but can
be moved to 鈥楳AN OPEN鈥?/div>
position for system draindown
and filling purposes only.
Before fitting the valve, read
through the plumbing and
wiring instructions.
This product MUST be
installed by a competent
person. The installation MUST conform to I.E.E.
Regulations and with The Electricity at Work Regulations.
A Class 鈥楢鈥?switch (having contact separation of at least
3mm in all poles) must be incorporated in the fixed wiring
as a means of disconnecting the supply. The system must
be appropriately fused.
AUTO
MAN
OPEN
Flow
Characteristics
Plumbing
The valve MUST NOT be fitted on the return pipework
under any circumstances. Flow from the boiler must be
connected to port AB, the radiator circuit to port A and the
hot water cylinder circuit to port B.
The valve may be plumbed in at any angle but must not be
mounted so that the valve head is below the horizontal
level of the pipework. In the unlikely event of a leak a
safety hazard could result.
Do not grip the valve head while making and tightening up
plumbing connections. Attach a spanner (32mm or 1
1
/
4
" AF)
onto the valve body at each port, whilst tightening up the nuts.
Tighten compression nuts enough to make a watertight seal.
TAKE CARE NOT TO OVERTIGHTEN.
AUTO
MAN
OPEN
1
2
