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A suitable draining tap should be installed in the
`
cold water supply to the appliance between the
Expansion (Pressure) Valve and the appliance at
as low a level as possible.
It is recommended that the outlet point of the drain
`
pipework be at least 1 metre below the level of the
base of the appliance (this can be achieved by
attaching a hose to the drain tap outlet spigot).
Hot water distribution pipework should be 22mm
`
pipe with short runs of 15mm pipe to terminal
fittings such as sinks and basins. Pipe sizes may
vary due to system design.
12
11
10
9
8
Figure 6: Typical installation - schematic (not to scale)
Item
1
2
3
4
5
6
7
8
9
10
11
12
Table 5: Typical installation table
6
7
5
Expansion (Pressure) Relief Valve
Temperature and Pressure Relief Valve
4
3
Description
Cold Water Mains in
Service Valve (not supplied)
Pressure Reducing Valve
Balanced Cold Water Draw Off
Check Valve
Expansion Vessel
Tundish
Drain Off Valve
Hot out
Water heater
1
2
11
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