Installation Instructions
7
4.6 Cold Water Valve
The combined cold water valve (supplied) can be connected anywhere on the cold water mains prior to the unit. It can be located
at a point near to where the mains supply enters the premises if this is more convenient. When installing the cold water valve,
ensure that the arrow is pointing in the same direction as the mains water supply flow when connecting (see figures 5 and 6).
The cold water balancing port, on the valve, allows you to connect the cold water mains to the rest of the property thus giving
balanced pressure throughout. If this facility is not required leave the cap on.
4.7 Check Water Pressure and Flow Rates
Dutypoint suggests 1.5 bar pressure and 20 litres/minute flow rate to be the minimum requirements for satisfactory operation. The
unit will still operate below this, but it will not be possible to run two or more outlets at the same time.
4.8 Drain Tap
A drain tap to drain the unit must be fitted to the cold-water inlet pipe between the cylinder and the cold water valve assembly at
its lowest level possible (see figures
Figure 1
,
Figure 2
and
Figure 3
).
4.9 Pipework to Outlets
Pipework to outlets should be suitably sized to meet appliance requirements.
4.10 Inlet Group
The inlet group will vary depending on whether the vessel is fitted as internal or external expansion (see
Figure 1
,
Figure 2
,
Figure 3
).
4.11 Connecting the Water Supply
Pipework is not supplied.All pipework should be installed using good plumbing practice. We recommend 22mm mains cold water
supply is used. Install a stop cock valve before the cold water inlet assembly on the incoming mains water supply so the unit can
be isolated if required.
4.12 Primary Circuit
The motorised valve supplied and the thermal cut-out (high limit stat) must be fitted to the primary flow (use compression fittings
only).
4.13 Operation of the cut-out & motorised valve
To comply with regulations and to prevent the temperature reaching 100°C the thermal cut-out supplied must be fitted.
The thermal cut-out is wired in series to the cylinder thermostat. When the thermal cut-out senses an abnormal rise in temperature
in the primary flow the electrical supply to the motorised valve will be cut and the valve will return to the closed position. This will
cut-off the primary water from the boiler to the indirect coil in the cylinder. If the thermal cut-out operates it must be reset
manually. Check the cylinder stat and/or boiler stat.
PRODUCT IS NOT SUITABLE FOR SOLID FUEL OR WOOD BURNING BOILERS
— These systems must not be used on the primary circuit of an unvented hot water system.
