Central Heating Sealed System Equipment

SEALED HEATING SYSTEMS

Sealed systems are the most commonly used form of central heating in Europe. Easy to install and alleviate the need to fit feed and expansion tanks in a central heating system. Air and water are separated by a flexible diaphragm. When the system is cold the expansion vessel is nearly full of air or nitrogen, when hot, the water expelled from the system by expansion enters the vessel and compresses the air or nitrogen.

Expansion Vessels

Sizes up to and including 24 litres may be wall mounted using the Mounting Bracket shown below. The 35 and 50 litre sizes have fitted feet. Not for use with potable water. Kitemarked to BS 4814.
TECHNICAL SPECIFICATION: Maximum working pressure 3 bar. Maximum system temperature 99ºC. Thread 3/4" BSP male.
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Expansion Vessel Mounting Bracket

Suitable for expansion vessels up to 25 litres. Vessels larger than this should be floor mounted.
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Pressure Reducing Valve

Pressure reducing valves are installed on hot or cold water services to reduce the incoming pressure from the supply mains or boosted pressure within a building. Suitable for water services in domestic, commercial and industrial applications to supply water at a designated pressure. 22 mm compression connections with 22 x 15 reducing adaptors included.
SPECIFICATIONS :
Max. inlet working pressure : 16 bar
Min. outlet pressure : 1 bar
Max. outlet pressure : 6 bar
Factory preset : 3 bar
Pressure gauge connection : 1⁄4" BSP
Pressure gauge reading : 0 - 10 bar
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Pressure Reducing Valves

Suitable for use with combination boilers. Internal cartridge and filter can be serviced in situ.
Maximum inlet pressure 16 bar.
Preset 3 bar. Adjustable 1-6 bar.
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Shock Arrester

To prevent water hammer. Fit as close to the problem area as possible. Set at 3.0-3.5 bar. Maximum pressure 15 bar.
Vessel capacity = 0.16 litre.
Diameter = 86 mm.
Height =122 mm.
Connection = 1/2" BSPTM

WRAS approved
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Sealed System Filling Kit

Contains all the essential components required for a sealed system installation.
Contents: filling loop, 3 bar safety relief valve complete with gauge, connecting T-piece and vessel mounting bracket.
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Safety Relief Valves

Diaphragm type safety valves. A necessity for ensuring the safety of sealed systems, to avoid over pressure. Set at 3 bar (44 p.s.i.) pressure, (except 17107 at 2.5 bar).
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NABIC Safety Relief Valves

The NABIC Fig 542 safety relief valve suitable for use on hot water, steam, air, CO2 (to -20°C), ethylene glycol and potable water. Gunmetal construction, with diaphragm protected working parts and PTFE to metal seating. To BS 6759: 1984, WRc approved. All wetted parts are manufactured from dezincification resistant materials, approved by the WRc for use on potable water.

SPECIFICATIONS:
Factory set pressure: 3 bar
Maximum operating temperature: 195°C
Inlet and outlet threads: female to BS 21:1985
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Pressure Relief Outlet Terminal

The 'Pro-Term' has been designed to be fitted easily from inside the building, reducing fitting time; for all pressurized domestic heating systems. Manufactured to BS EN 1254: 1998 and complies with all current legislation. 3 part construction, comprising Pro-Term, stabilising flange and pipe insert.

Pro-Term standard (Type 1) -
designed for walls up to 12" thick 'Standard construction'.
Pro-Term non-standard (Type 2) -
designed for walls up to 39" thick 'Tenements and Sandstone construction'.

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Aluminium Tundishes

For use where an air gap or air break is required in sealed or unvented systems.
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AIR VENTS

Bottle

Bottle air vents with check valve which allows removal of the vent for cleaning without draining down the system.
Approximate height, excluding thread :
P/N 7703 87 mm (3.3/8")
P/N 7704 82 mm (3.1/4")
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Robocal

Designed for the removal of air in the system.

TECHNICAL SPECIFICATION:
Connection : 15mm comp
Max. Working Pressure 6 Bar
Max. Working Temperature 115°C
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FILLING LOOPS

Comprising a DZR double check valve connected to either a straight or tee brass isolating valve. P/N 15583 has a further isolating valve at the double check valve end. Each hose is fitted with a WRAS approved stop and double check valve. All ends are 15mm compression.
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