Évaluations - 3, GPA: 4
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Facilité d'utilisation
The minimal ionisation current is 0.9 micro- Amperes DC. Below this current the burner controller will assume no flame present. When in normal operation, the ionisation current wil be about 1.2 to 1.3 micro-Amperes DC when only the pilot flame is burning. (Adjust the main burner pressure to zero to be able to measure under this condition) With pilot- and main burner in operation, the ionisation current will be about 6.0 and 6.3 micro-Amperes DC. Ionisation current can be measured by connecting a universal-meter in series in the connection to the ionisation electrode. Make sure to measure in Direct Current; Alternating Current in fact gives no information about the system’s behaviour. 2. FOR THE INSTALLER 2.1 Installation instructions This water heater must be fitted in a location which will permit the provision os an approved flue system and adequate ventilation. A service clearance of 15 cm at the sides and rear of the unit and 60 cm at the front of the unit should be allowed for ease of servicing. Adequate distance must be allowed between the top of the unit and any obstruction or ceiling to allow the flue baffle and anode to be inspected, cleaned or in the case of the anode replaced if necessary. The water heater must stand on a level surface resistant to heat, insulted in accordance with local bylaws and Building Regulations 1985, with sufficient strength to support the weight of the unit when full of water. This water heater must not be installed in a bathroom, bedroom or in a cupboard opening on to such rooms. This water heater must not be installed in any area where flamable materials are used or stored. Insufficient ventilation may give rise to a risk of fire, explosion or suffocation. If in doubt consult the national and local regulations governing the installation of gas appliances or your British gas sevice department. 2.1.1 Installation The installation of this water heater should be carried out by a suitably qualified competent person. It is a criminal offence for unqualified persons to install gas equipment. Installation should be carried out in accordance with all local authority and Building Regualions, Model Water Bylaws, bylaws of the local water supplier, Building Standards (Scotland) (Consolidation) Regulations and any relevant requirements of the Local Authority, local gas regions and the following British Standards (current editions): For domestic applications: BS 5440 -part 1 and part 2. BS 5546 -Installation of gas hot water supplies for domestic purposes. BS 6700 -Specifications for design, installation and maintenance of services supplying water for domestic use within buildings and their curtilages. BS 6798 -Specification for installation of gas fired hot water boilers of rated input not exceeding 60 kW. BS 6891 -Specification for installation of low pressure gas pipework of up to 28 mm in domestic premises. For non-domestic applications: BS 5400 -part 1 and part 2. BS 6798 -Specification for installation of low pressure gas pipework of up to 28 mm in domestic premises. CP 342 - Code of practice for centralised hot water supply part 2, buildings other than individual dwellings and the following additional Codes of Practice. IM/2 -Purging procedures for non- domestic gas installations. IM/5 -Soundness testing procedures for industrial and commercial gas installations. IM/11 -Flues for commercial and industrial gas fired boilers and air heaters. IM/16 -Notes on installation of pipework (excluding 25 mm and below). Some chemicals produce vapours which can cause rapid failure of main- and pilotburners and storage tanks if they are drawn into the combustion air supply. 13 Figur 4 - Connection diagram vented systems Therefore if this water heater will be used to supply hot water to: - hairdressers, - dry cleaners, - industrial degreasing processes or any other area where compounds containing halogens are used and stored, care should be ta ken that all primary and secondary air is drawn from outside atmosphere free of such contaminents. For futher advise contact A.O. Smith. 2.1.2 Water circulation system A.O. SMITH water heaters are suitable for connection to vented, unvented and pumped pressurised systems. In each case appropriate valves and fittings should be used to ensure the system complies with the requirements of the water by laws, and appropriate building regulations. When fitting it is essential the rules of ‘good practice’ are applied at all stages of installation. Vented systems (See figur 4) If the water heater is to be connected to a cold feed tank or cistern the hot water supply pipe must include an open vent which discharges over the cold feed cistern. The cold feed cistern must have an actual capacity of greater volume than the hourly recovery rate of the water heater(s) which it supplies. The minimum actual capacity is 50 gallons or 227 litres. 1) Manual gas valve 2) Stop valve 3) Three way valve 4) Safety valve 5) Non return valve 6) Circulation pump 7) Drain valve A) G...
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