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Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 9: Mechanical gas thermostats
ISO 23551-9:2015 covers type testing only.
ISO 23551-9:2015 applies to mechanical gas thermostats of nominal connection sizes up to and including DN 50 with declared maximum inlet pressures up to and including 50 kPa for burners and gas-burning appliances using fuel gases as natural gas, manufactured gas, and liquefied petroleum gas (LPG).
ISO 23551-9:2015 applies to mechanical thermostats controlling the gas flow directly or indirectly through an integral gas valve and which do not require external electrical energy for their operation.
ISO 23551-9:2015 only applies to mechanical thermostats used on gas appliances where the thermostat is not directly exposed to the outdoor environment.
ISO 23551-9:2015 only applies to mechanical thermostats which are intended for operating control functions.
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