This European Standard specifies the safety, construction and performance requirements for mechanical thermostats intended for use with gas appliances and similar use, hereafter referred to as `thermostats'. This European Standard covers type testing only. It applies to thermostats controlling the gas flow directly or indirectly through an integral gas valve, and which do not require external electrical energy for their operation. It applies to thermostats of nominal connection sizes up to and including DN 50 with declared maximum inlet pressures up to and including 500 mbar (50 kPa) for use with one or more fuel gases in accordance with EN 437. It only applies to thermostats used with gas appliances which are not installed in the open air. Thermostats dealt with in this standard are intended for control functions.
Số hiệu tiêu chuẩn
prEN 257
Tên tiêu chuẩn
Mechanical thermostats for gas-burning appliances
Ngày phát hành
2008-08-00
Tiêu chuẩn tương đương
DIN EN 257 (2008-08), IDT * 08/30183343 DC (2008-08-13), IDT * D36-500PR, IDT * OENORM EN 257 (2008-10-01), IDT
Từ khóa
Adjustments * Ambient temperature * Assembly instructions * Bearings * Bending * Bodies * Calibration * Checking equipment * Chemical hazards * Circuits * Compression fittings * Conditions * Connections * Construction requirements * Control systems * Controllers * Correcting units * Corrosion * Definitions * Density * Dimensions * Elastomers * Electrical equipment * Enclosures * Explosion hazard * Fire risks * Flows * Gas appliances * Gas flow * Gas-powered devices * Impermeability * Impregnation * Leak rate * Marking * Materials * Mechanics * Moisture resistance * Moisture test * Nominal widths * Opening pressure * Openings * Operating instructions * Product specification * Protection * Ratings * Safety * Safety components * Safety devices * Safety engineering * Safety requirements * Sealing * Set value * Specification (approval) * Temperature * Temperature controllers * Test apparatus * Testing * Testing conditions * Thermal stress * Thermostats * Threads * Tightness * Transportable * Warning notices * Working data * Zinc alloys * Design * Storage * Freedom from holes * Lines * Ports (openings) * Requirements * Testing devices
prEN 257
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