7
Technical Data
The Twyford Sola thermostatic shower valve is suitable for installations on all types of
plumbing systems, including gravity supplies, fully pumped, modulating combination boiler,
unvented water heater and unbalanced supplies i.e. Cold Mains & Tank Fed Hot. They are
not suitable for non-modulating combination boilers.
Max Inlet Pressure (Static) 10 bar Max Inlet Temperature 85˚C
Max Inlet Pressure (Dynamic) 5 bar Pre Set Factory Temp Setting 38˚C
Min Operating Pressure (Dynamic) 0.2 bar Temperature Stability ±2˚C
Max Unbalanced Pressure Ratio 5:1 Min Temp Differential to
Inlet Connections (Body only) 15mm ensure fail-safe between hot
Outlet Connection
½” and cold supplies 10˚C
Unvented Mains Pressure System
The drawing shows a typical installation of a shower mixing valve in conjunction with an
unvented hot water system. This type of installation must be carried out in accordance with
Part G of the Building Regulations.
Whilst pressures are theoretically equal (balanced) most unvented hot systems have a
pressure reducing valve on the incoming cold water prior to the hot water storage vessel.
This means that the hot and cold pressures can be significantly different.
Most unvented systems use an inlet manifold located directly after the pressure reducing
valve.
It is recommended that the cold supply be
taken from one of the outlets of the manifold
directly to the shower as an independent
supply.
For systems without a manifold unit after the
pressure reducing valve and where the cold
water supply pressure is significantly higher
than the hot supply we recommend that a
separate pressure reducing valve is fitted to
the cold supply, as close as possible to the
shower valve and with no draw off points
between it and the shower valve.
Flow regulators are required for installations
where a PRV is not fitted to ensure
simultaneous demand is accounted for.
Manifold
PRV
PRV if
manifold is
not used
Cold Supply direct
from mains
