INSTALLATION

Location
Units may be suspended or base-mounted on a non-combustible surface. Installation should be carried out by a competent CORGI registered installer, in accordance with the installation instructions provided and current codes of practice. Incorrect installation will invalidate the warranty.

For applications supplying fresh air ventilation, stainless steel heat exchangers (AISI 409) are recommended. Where chlorinated vapours or certain other contaminants may be present, special grade stainless steel (AISI 316) should be specified. Whilst the units are suitable for most industrial and commercial applications, standard units must not be installed in atmospheres containing highly flammable vapours, combustible dust, halogenated hydrocarbons or chlorinated vapours. For such applications, separated combustion units or remotely-sited units will be required, depending on the application.

Care should be taken to ensure that the units are level and isolated from any vibrations.

ALWAYS ENSURE ADEQUATE COMBUSTION AIR IS PROVIDED IN COMPLIANCE WITH BS5440 AND/OR BS 6230 DEPENDENT ON HEAT OUTPUT OF THE APPLIANCE.

Flue
Conventionally flued T Series heaters are supplied complete with integral down draught diverter. A flue collar located on top of the heater accepts single wall flue; an adaptor will be required for other types of flue. A power flue venter is available as an optional extra. Power-vented flues may be used for difficult flue routes, horizontal flues, or to overcome slightly negative pressure within the building.

Room sealed ST heaters are fitted with integral power flue venters and a differential air pressure switch. The pressure switch monitors flow and shuts down the heater in the event of flue or combustion air blockage. To comply with CE approvals, room-sealed ST appliances must be used with the sealed flue system provided by the manufacturer. The balanced flue terminal provides both the flue outlet and air inlet from a single building penetration. The balanced flue outlets are ordered separately from the heater and a choice of wall outlet or roof outlet is available. Up to 9 metres of additional pipe can be added to both the flue and the combustion air inlet (reduce by 1.5 metres for each 90^o bend).

Connections to the heater flue outlet and combustion air inlet require sealed single wall pipe.

Gas Supply
The connection size to the heater does not indicate the size of gas supply pipework required. Gas supply pipework should be sized within allowable pressure drops to comply with current codes of practice.

Standard units are supplied for use on natural gas and require a minimum inlet pressure of 17.5mbar. Maximum inlet gas pressure to the unit should not exceed 30mbar.

Electrical
Units must be wired in accordance with the wiring diagrams provided and the current edition of electrical standards. The main electrical supply to the units should not be isolated except for maintenance. Controls must be wired to the appropriate terminals and must not interrupt the mains supply to the heater.

* Varies according to roof pitch
** Deduct 1.5 metres for each 90^o bend. An equal amount of combustion air pipe may also be added.