CSA 3.7:2017 pdf download.Non-recirculating direct gas-fired heating and forced ventil lation appliances for commercial and industrial application
1.1 CSA 3.7 applies to newly produced, non-recirculating direct gas-fired heating and forced ventilation appliances, hereinafter referred to as heaters, whose purpose is to address building infiltration, replace building air that is exhausted, offset building conduction heat loss and provide outside air ventilation. All air to the heater is ducted directly from outdoors and the products of combustion generated by the heater are released into the air stream being heated.Heaters covered by this Standard are intended for use in industrial and commercial applications.
Heaters covered by this Standard are not intended for use in any area containing sleeping quarters. The installation conforms with local codes, or in the absence of local codes, in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installation Code, CSA B149.1.
1.2 This Standard applies to heaters designed for heated discharge air temperature of 160。F (71。C) or less.
1.3 This Standard is intended to cover only complete packaged heaters with integral air moving components, i.e., those which are designed by, cataloged by, and built on a repetitive basis by the manufacturer.
1.4 If a value for measurement as given in this Standard is followed by an equivalent value in other units,the first stated value is to be regarded as the specification.
Intermittent - an ignition source that is automatically ignited or energized when an appliance is called on to operate and that remains continuously ignited or energized during each period of main burner operation. The ignition source is automatically extinguished or de-energized when each main burner operating cycle is completed.
Intrmittent/continuous一an ignition source that is ignited or energized upon appliance user initiation of the operational cycle and that remains continuously ignited or energized during the appliance use cycle. The ignition source is extinguished or de-energized when the appliance use cycle is completed.
Intermittent/interrupted一an ignition source that is ignited or energized upon appliance user initiation of the operational cycle and that is extinguished or de-energized after the appliance use cycle has been initiated.
Interrupted一an ignition source that is automatically ignited or energized when an appliance is called on to operate and that remains ignited or energized during the main burner Flame-Establishing Period. The ignition source is automatically extinguished or de energized when each main burner Flame-Establishing Period is completed.CSA 3.7 pdf download.