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3 Installation Requirements3.4 Ventilation RequirementsDetailed recommendations for air supply are given in BS 5440:2. The followingnotes are for general guidance.a) It is not necessary to have a purpose provided air vent in the room orinternal space in which the appliance is installed.b) If the boiler is to be installed in a cupboard or compartment, no permanentair vents are required for cooling purposes in the cupboard orcompartment, however, it is essential to ensure that the minimumclearances stated in section 2.4 are maintained.Figure 3/B: Typical System Design (Combi Boiler)Note: The boiler incorporates an internal bypass to ensure adequate water flow, however one radiator(preferably in the bathroom) should be permanently open (fitted with two lockshield valves) to dissipate anyexcess heat.• The following Viessmann controlconfigurations are available:-Constant Temperature = CompatibleTimer with Constant Temperature = CompatibleWeather Compensated Controls = CompatibleUTD = CompatibleThe Boiler will require a permanent live feed via plug 40. (see section 4)14
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