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2 Some Fire Authorities recommend that both Ionisation and Optical Smoke Alarms should be fitted for the fastest response to all types of fires. 3 Some Fire authorities (concerned with the slow response of Heat Alarms) advise that Smoke Alarms should be fitted. This is acceptable according to BS 5839-6 provided there are clearly not going to be problems with nuisance alarms. Fit Heat Alarms only if nuisance alarms are very likely and it is acceptable that a warning will only be given by the Heat Alarm when there is a very significant flaming fire in the room. If the door(s) and windows are not closed to contain the fire and heat, it is extremely unlikely that the Heat Alarm would respond before a Smoke Alarm sited outside in the corridor. 4 In enclosed kitchens with doors closed. 5 Greatly depends on ventilation and distance from source of fumes. 8 B16008-R0-160RC SERIES-U&C 17/1/07 11:13 AM Page 8 Improved Audibility The effectiveness of Category LD2 and LD3 systems can be significantly enhanced if an additional Smoke Alarm (interconnected) is installed in the master bedroom. This will help ensure that a responsible person will quickly be alerted to a fire and can arrange for an orderly evacuation of children and other vulnerable occupants. 2.3 Grade D, E & F Systems The mains powered Smoke and Heat Alarms with battery back-up covered by these instructions are suitable for Grade D, E & F Systems. A Grade D system is needed for: - new or materially altered dwellings, up to three-storeys, with no floor over 200m2 - existing dwellings with poor structural fire precautions, up to three storeys, with no floor over 200m2 - Houses in Multiple Occupation (HMOs) of one or two-storeys, with no floor over 200m2 - Individual dwellings units of two or more rooms in HMOs Check that a Grade D system is adequate for the dwelling into which the system is being installed. 3. POSITIONING ALARMS The locations must comply with applicable building regulations. Hot smoke rises and spreads out, so a central ceiling position is the preferred location. The air is “dead” and does not move in corners, therefore Smoke & Heat Alarms must be mounted away from corners. Place the unit: -At least 0.3m away from walls. See Figure 1. - At least 0.3m from any light fitting or decorative object which might obstruct smoke / heat entering the Alarm. 0.9m 0.3m Figure 1 Figure 2 (Smoke Alarms should be located directly on the ceiling or, if not possible, up to 575mm below it. Heat Alarms should be located directly on the ceiling or, if not possible, up to 125mm below it). Sloping Ceiling In areas with sloping or peaked ceilings install the Smoke/Heat Alarm 90cm from the highest point measured horizontally (see Figure 2), because “dead air” at the apex may prevent smoke from reaching the unit. 9 B16008-R0-160RC SERIES-U&C 17/1/07 11:13 AM Page 9 3.1 Locations To Avoid DON’T place Smoke Alarms in any of the following areas: • Bathrooms, kitchens, shower rooms, garages or other rooms where the smoke alarm may be triggered by steam, condensation, normal smoke or fumes.Keep at least 6 metres away from sources of normal smoke/fumes. DON’T place Heat Alarms in any of the following areas: • Bathrooms, shower rooms or other rooms where the unit may be triggered by steam or condensation. DON’T place Smoke or Heat Alarms in any of the following areas: • Places where the normal temperature can exceed 40°C or be below 4°C (e.g. attics, furnace rooms, directly above ovens or kettles etc.) as the heat/steam could cause nuisance alarms. • Near a decorative object, door, light fitting, window moulding etc., that may prevent smoke or heat from entering the Alarm. • Surfaces that are normally warmer or colder than the rest of the room (e.g. attic hatches). Temperature differences might stop smoke or heat from reaching the unit. • Next to or directly above heaters or air conditioning vents, windows, wall vents etc. that can change the direction of airflow. • In very high or awkward areas (e.g. over stairwells) where it may be difficult to reach the alarm (for testing, hushing or battery replacement). • Locate away from very dusty or dirty areas as dust build-up in the chamber can impair performance. It can also block the insect screen mesh and prevent smoke from entering the smoke detector chamber. • Locate the unit at least 1m from dimmer controlled lights and wiring as some dimmers can cause interference. • Locate unit at least 1.5m and route wiring at least 1m away from fluorescent light fittings as electrical “noise” and/or flickering may affect the unit. Do not wire into the same circuit as fluorescent lights or dimmers. • Do not locate in insect infested areas. Small insects getting into the smoke detector chamber can cause intermittent alarms. Insects and contamination on the Heat Alarm sensor can increase its response time. 4. INSTALLATION The Alarm is designed to be permanently mounted , using it’s own built-in terminal block to connect it to the mains. The ...

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