6
SIENA
Digital electronic water heater
3.6. Storage and handling
If the cylinder is not being installed immediately, it should remain in its original box with all pipe end
protective caps in situ to prevent damage. We recommend that the cylinder be transported to its
installation position with the outer box in place.
4. Plumbing installation
4.1. Connections
All pipework connections to the cylinder MUST be made in accordance with Figure 1 (page 5) and
Figure 2 (page 7). A drain cock (not supplied) should be fitted in the position shown in Figure 2 (page 7)
to facilitate draining of the cylinder.
4.2. Electrical fittings
The electrical fittings (Figure 2, page 7) must be fitted to the product. If not, the guarantee will be null
and void. Check the T/P Relief Valve (Figure 2, page 7) to ensure it is connected with the electrical
fittings. If not, please contact us by telephoning 0203 321 5929.
4.3. Cold water supply
For best results, the cylinder should be fed by an uninterrupted supply pipe into the pressure reducing
valve (PRV) (Figure 2, page 7) with a maximum supply pressure of 0.9 MPa. The cylinder should not
be used on any system with a supply pressure below 0.15 MPa and a flow rate of less than 20 litres
per minute.
4.4. Temperature and pressure relief valve
The temperature and pressure relief valve (T/P Valve) is supplied (Figure 2, page 7). Once the T/P
valve is fitted it should not be removed from the cylinder or tampered with in any way. The valve is pre
calibrated to lift at 0.7 MPa or 90
o
C and any attempt to adjust it will render the guarantee null and void
and could affect the safety performance of the unit.
The outlet of the T/P valve should be routed in 15 mm copper piping in a downward direction alongside
the product to the tundish in a frost-free environment. The outlet of the expansion relief valve must be
T’d into this pipe before the tundish so that any water exiting either valve can be seen draining through
the tundish – see Figure 2 (page 7) and Figure 3 (page 9).
Figure 2 - SIENA cylinder connection arrangement
