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2-3.1 Stop Cock
Normally located at the point where the mains supply enters the dwelling.
Shuts off the mains water supply to the dwelling.
2-3.2 Double Check Valve
Normally located after Stop Cock.
Shuts off the mains water supply to the dwelling and prevents Backflow.
2-3.3 Cold Water Shut Off Valve
Normally located in the cold feed close to the Cylinder.
Shuts off the cold water to the taps.
2-3.4 Supply Water Shut Off Valve
Normally located where the cold supply connects to the combination valve on the Cylinder.
Shuts off the cold supply to the Dualstream system.
2-3.5 Hot Water Shut Off Valve
Normally located where the Domestic Hot Water feed comes from the Cylinder.
Shuts off the hot water to the taps.
2-4 PRESSURE RELIEF
The OSO Dualstream installation has a Pressure Relief Valve normally mounted on the cylinder. In the event of the
pressure within the system becoming too high, the Expansion Relief Valve will open, venting the pressure.
A tundish will be fitted in the system, this should be located in a position where it can be seen. This device gives
a visual warning that pressure is being vented as water.
In the event of water being seen at the tundish do the following:-
1. Turn ON a hot tap to relieve the pressure.
2. Turn OFF the Electric Immersion Heater.
3. Turn OFF the Heating System.
4. Investigate possible cause for high pressure e.g:-
i
Cylinder Thermostat is set too high.
ii
Mains water is not on or fully on.
iii Restriction in hot water pipework.
5. Contact the installer before restarting the system.
2-5 SERVICING
It is recommended that the system is inspected by an approved engineer
once per year.
The service procedure is included in section 6-1.1.
OPERATOR CONTROLS 2
7
CLOSED
OPEN
Fig. 2-3b Valves
Note: The Tundish should remain
in view do not box it in or cover it up.
Fig. 2-4 Tundish
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