15
2. Unscrew the pressure reducing cartridge
3. Clean the filter mesh and the cartridge under
running water.
4. Replace cartridge ensuring that strainer is
correctly located and reassemble the unit.
Pressure Reducing Valve cartridge and
strainer Part No. REDC355030 - 3 Bar.
Expansion relief cartridge
1. Isolate the cold water supply and open a
ground floor cold tap.
2. Unscrew blue expansion relief headwork
from valve body.
3. Clean valve seat face and seating - do not
scratch or damage either seat face or seating.
4. Refit in reverse order. Do not overtighten
Expansion valve cartridge and seat Part No.
RELC 214005 6.0 Bar.
Complete Expansion Valve Part No. PREL
355030.
Expansion vessel
Repressurizing vessel:
1. Close cold water supply valve
2. Remove cap covering air valve
3. Adjust the vessel air pressure in relation to
the set incoming water pressure using an air
compressor or hand pump.
4. Replace the air valve cap.
Note: If water emits from the air valve the vessel is
punctured and must be replaced.
It is a condition of the warranty that annually a
competent person:
1. Inspects and cleans the line strainer.
2. Checks the operation of the expansion relief
valve and temperature & pressure relief valve.
3. Recommissions the cylinder in accordance
with the instructions above.
4. Checks the thermostat and visually inspect
the immersion heater.
5.4 Corrosion resistance
Stainless steel is naturally corrosion resist-
ant to mains water supply. No specific main-
tenance is required to maintain this resistance.
Please see warranty terms for permissable wa-
ter content. Please note: OSO cylinders are not
warranted for use with a private water supply.
The immersion heater can be removed to provide
visual inspection access to the cylinder.
For further information contact your Building
Control Office.
