OSO 20 RD User Manual

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 is removed. To accommodate the expansion of
secondary water an expansion vessel suitable for potable water must be connected to the
cold entry to the cylinder (See fig. 3).
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 - 5.0 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.
Standard Capacity
100
125
170
120
150
200
81212
81212
81212
12 18 19
12 18 19
210
250
18
18
18
24
24
250
300
18
18
18
30
30
330
380
24
24
24
40
40
Without Dip Pipe
PRV
Bar
2
2.5
3
4
5
8
8
8
8
8
Expansion
Relief Bar
Expansion Vessel Volume (Litres)
-15-
FIGURE 3
EXPANSION VESSEL
Expansion Vessel Sized
to System Volume

OSO 20 RD Specifications

General

Brand	OSO
Model	20 RD
Category	Water Heater
Language	English