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10.1 28mm Connections
OSO Dualstream units with hot water capacities from 250 litres to 380 litres are available with 28 mm hot and cold
connections. The combination valve supplied will incorporate an adjustable pressure reducing valve, line strainer, non-return
valve, balanced cold take off and connection for expansion vessel.
Hot water connection is 1" BSP.
11.1 Fault Diagnostic
PROBLEM
1. Poor flow rate at taps
2. Good volume for short time then tails off.
Or performance the same no difference.
Water not entering accumulator
3. Mains water discoloured
4. Water leaking from beneath accumulator
5. Water condensation running down accumulator
6. Noise from accumulator when filling water hammer noise
E15 Marquis Court, Team Valley Trading Estate, Gateshead, Tyne & Wear, NE11 0RU • Tel. (0191) 482 0800 • Fax. (0191) 491 3655
Email. technical.uk@oso-hotwater.com • sales.uk@oso-hotwater.com • spareparts.uk@oso-hotwater.com
SERVICEABLE 1" PRESSURE
REDUCING CARTRIDGE AND LINE
STRAINER (SET AT 3.5 BAR)
28mm COLD
MAINS IN
OSO Hotwater (UK) Limited
Web www.oso-hotwater.com
19
28mm CONNECTIONS
1" BALANCED COLD WATER TAKE OFF
WITH NON-RETURN VALVE
CHECK
Line Strainer
Isolation valves fully open
No check valves online
Size of pipework
Accumulator pressure charge
Accumulator pressure
Incorrect setting re-set
1.5 bar differential between accumulator and reading on
combination valve min setting 0.5 bar.
Drain down accumulator refill, if persists check mains
supply. Redish taint to water. Check air in accumulator, no
air present only water, diaphragm faulty replace
accumulator.
Drain down accumulator, tilt back and check compression,
fitting may be loose from transit.
Check pipework lagged, air movement or change within
confined space.
Normal situation expansion of diaphragm, check valves,
check jumpers in stop cock.
EXPANSION RELIEF VALVE
(SET AT 8 BAR)
28mm TO
CYLINDER
3/4" B.S.P. CONNECTION
FOR EXPANSION VESSEL
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