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HB Herringbone Installation Procedure

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Fan AssyTrapManifoldDamperDamperTubes and BracketsBurnerReflector and End CapsTubes and BracketsBurnerReflector and End Caps

HB Herringbone Installation

Manifold Suspension

The manifold should be supported by chain, stainless steel flexible wire, or other flexible means from the roof structure to allow movement caused by thermal expansion. Maximum support centres for 100mmDia manifold pipe is 2.4m, of 3.0m for 150mmDia pipework. Flexible couplers (supplied by Ambi-Rad) must be inserted within the manifold system to allow linear expansion to take place and prevent stress and strain on the system. Note The manifold must be supported either side of the flexible coupler. Where the HB heaters are to be inclined/wall mounted, the manifold must be installed at the same height as the centre of the emitter tube. For typical wall mounting bracket arrangement see AR installation manual (Click Here).


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Condensate trap

A condensate trap assembly must be provided at the end of the manifold system before the hot gas vacuum fan. (Click Here)  The minimum depth of the condensate collecting chamber shall be 305mm (12in) and the minimum depth of the condensate drain pipe ‘U’ trap shall be 457mm (18in) deep. The end cap of the collecting chamber to be fitted with a flush flanged tank connector. Any protrusion to be removed leaving the inside flush with end cap (Click Here). The end cap to be sealed with silicon jointing compound and pop riveted in position. All condensate drains from the flue collecting chamber to the disposal point shall be corrosion-resistant material of not less than 22mm internal diameter. Copper or copper based alloy shall not be used for condensation drains.


See reference BS 6896:1991.
Ensure that a 1½ in. drain tube is fitted to the connection on the under side of the non-return valve. The drain tube must be resistant against the action of flue gas condensate and suitable for operation up to a maximum temperature of 50°C. Ensure that the drain tube is adequately supported. Copper or copper based alloy shall not be used for condensate drains. Preferably the condensate pipe should run and terminate internally to a soil and vent stack or a waste pipe. Alternatively, the condensate can be discharged into the rainwater system or a purpose-made soakway. All connecting drainage pipework should have a fall of at least 2.5° to the horizontal or approximately 50mm per metre of pipe run. If the drainage pipe has a run externally, it is recommended that the pipe is insulated to protect against frost. It should be noted that the connection of a condensate pipe to a drain might be subject to local building controls. The condensate drainage pipe should be run in a standard drain pipe material, e.g. polyvinyl chloride (PVC), unplasticized polyvinyl chloride (PVC-U), ancrylonitrile-butadiene-styrene (ABS), polypropylene polyproene (PP) or cross-linked polyviynyl chloride (PVC-C).  Any internal pipework should be of a diameter specified above. Any external pipework should be kept to a minimum to avoid freezing and should have a diameter of not less than 22mm. Ensure that the arrow on the non-return valves is facing down.

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Last Modified on 26/11/2007.
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