Bosch Appliances 24i junior, 28i junior manual Water Systems & Pipework, Commissioning Installation

COMMISSIONING INSTALLATION

SYSTEM FILL

TYPICAL SEALED SYSTEM A - Appliance expansion vessel -

central heating

B - Extra expansion vessel - central heating return

C - Drain cock

P - Pressure relief discharge R - Radiators

A

B

P C

WATER SYSTEMS & PIPEWORK

PLASTIC PIPEWORK:

• Any plastic pipework must have a polymeric barrier with 600mm (minimum) length of copper or steel pipe connected to the boiler.

• Plastic pipework used for underfloor heating must be correctly controlled with a thermostatic blending valve limiting the temperature of the circuits to approx. 50°C. The pipework from the boiler to the blending valve must be in copper or steel (protected from corrosion).

PRIMARY SYSTEMS CONNECTIONS/VALVES:
•	All system connections, taps and mixing
	valves must be capable of sustaining a
	pressure up to 3 bar.	-PRE	INSTALLATION
•	Radiator valves should conform to
	BS2767:10.
•	All other valves should conform to BS1010.
•	Thermostatic radiator valves (TRV’s) must be
	used on all radiators within the sleeping
	accommodation but not the radiator where
	the room thermostat is sited. This must be
	fitted with lockshield valves and left open.
• A drain cock is required at the lowest point
	in the system.
•	An air vent is required at all the high points in
the system.
NOTE: The boiler is equipped with an automatic
internal by-pass.

SHOWERS/BIDETS:

• If a shower head can be immersed in water or comes closer than 25mm from the top edge of a bath or shower tray spill over level then an anti-siphon device must be fitted to the shower hose.

• Bidets with direct hot and cold mains water can be used (with the approval of the local water authority) and must be the over rim flushing type with shrouded outlets to prevent the fitting of hand held sprays.

SEALED PRIMARY SYSTEM:

• The CH sealed system must be filled using a WRAS approved filling loop or comply with the diagram opposite for system fill.

RR• Where the system volume is more than 100 litres or exceeds 2.65 bar at maximum heating temperature, an extra expansion vessel (B) must be fitted as close as possible to the appliance in the central heating return.

• Pressurise the extra expansion vessel (B) to the same figure as the expansion vessel built into the appliance.

• Do not use galvanised pipes or radiators.

RR

C

10

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)

WATER SYSTEMS & PIPEWORK