14
Figure 2 - D Series Cylinder Connection Arrangement
1 Mains cold water supply
2 Stop cock (not supplied)
3 Pressure reducing valve *
4 Check valve *
5 Expansion relief valve *
6 Discharge pipe 22 mm
7 Drain cock (not supplied)
8 Tundish *
9 Expansion vessel *
10 T/P relief valve (included)
11 Electrolytic fittings (included)
* Available in optional Installation Kit
4.5. Pressure reducing valve
The pressure reducing valve (Fig. 2 - Pt. 3) should be installed
in the cold water supply to the water heating unit with the arrow
pointing in the direction of water flow as shown in figure 2. This can
be connected to a maximum supply pressure of 0.9 MPa.
4.6. Expansion relief valve
(Fig. 2 - Pt. 5) This must be installed between the pressure reducing
valve and the water heating unit in accordance with Figure 2. No
other valve should be fitted between this valve and the cylinder.
The expansion relief valve contains a non return valve.
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