OSO SOLARCYL Installation Manual page 15

INCREASED VOLUMES AND HIGH PRESSURE OPERATION
1. The capacity of all OSO cylinders can be increased by approximately 20% if the internal hotwater
dip pipe supply connection (see page 2 part no 20) is removed by unscrewing the hot supply
connection. On a Solarcyl, the increased capacity can also make a significant difference to the
amount of hot water available from the upper heating coil to accommodate the expansion of
secondary water, an expansion vessel suitable for potable water must be connected to the cold
feed pipe between the pressure reducing valve and the cold entry to the cylinder (See fig 3
below).
2. Increased pressures can be obtained by fitting an adjustable pressure reducing cartridge (part
no: 100511) in the pressure reducing valve. This cartridge is adjustable between 0.5 and 5 bar.
It is advisable to remove the hot supply connection and fit a suitable expansion vessel (see 1
above) (see Fig 3).
3. Table 3 gives details of cylinder and expansion vessel capacities for a range of pressure settings.
4. The expansion vessel must be suitable for potable water and charged to the same pressure as
the pressure reducing valve.
5. If the cylinder is to be used in this manner ignore the filling procedure on page 4. Leave one hot
tap open. Open the cold water supply valve. When water appears at the open hot tap close the
tap. Open each hot tap in turn to expel air. Manually operate the pressure and temperature relief
valve (5) to ensure free water flow through discharge pipe. (Turn knob to left.)
Table 3
Standard
Capacity
Without DIP Pipe
PRV Expansion
Bar Relief Bar
2 8
2.5 8
3 8
4 8
5 8
Figure 3
100 125
120 150
Expansion Vessel Volume (Litres)
8 12
8 12
8 12
12 18
12 18
Inlet Control Group
Drain Elbow
-15-
170 210
200 250
12 18
12 18
12 18
19 24
19 24
SUGGESTED CONNECTION POSITION
FOR EXPANSION VESSEL
Expansion Vessel Sized
to System Volume. Connection is
between inlet control group and drain
elbow to cylinder. Pressure should be
set to that of the Pressure reducing
Valve. Expansion vessel can be floor
or wall mounted.
250 330
300 380
18 24
18 24
18 24
30 40
30 40