ASME CSD-1:2006 pdf download Controls and Safety Devices for Automatically Fired Boilers
pool heater; an appliance designed for heating nonpotablwater stored at atmospheric pressure such as water inswimming pools, spas, hot tubs, and similar applica-tions,
postpurge period: a period of time after the fuel valvetclose, during which the burner motor or fan continueto run to supply air to the combustion chamber
period of time on each startup duringprepuurge period:awhich air is introduced into the combustion chambeiand associated flue passages in volume and manner as tccompletely replace the air or fuel-air mixture containectherein prior to initiating ignition.
pressure regulafor, LP-gas, firsf stage: on undiluted LP-gassystems, a pressure regulator designed to reduce pres
sure from the container to 10.0 psi (69 kPa) or less.pressure regillafor, LP-gas, second sfage: a pressure regulator for service on undiluted LP-gas systems designecto reduce first stage regulator outlet pressure to 14.0 inW.C.(4.0 kPa) or less.
pressure requlator, service: a pressure regulator installecby the serving gas supplier to reduce and limit the ser-vice line gas pressure to delivery pressure.
proven prepurge: a provision of the control system fopreventing burner operation until prescribed air flow isproven to be established during prepurge
qualified individual: a boiler service technician who isengaged in and is responsible for installation, replacement, repair, or service of the boiler, fuel burning systencontrols, and safety devices and is experienced in suchwork.
readily accessible having direct unimpeded access without the need of a ladder or removing or moving anpanel door, or similar covering of the item described.reccle: the process of sequencing a normal burner starfollowing safety shutdown before the establishment oflockout.
relay: a device that is operative by a variation in theconditions of one electric circuit to start the operationof other devices in the same or another electric circuit.such as pressure or temperature relay.relighf: the action upon loss of main flame to reestablishthe ignition source without recycle.sedimenf frap: a device in a gas line that collects andprevents solid debris (such as pipe dope, slag, dirt, etc..from traveling downstream into the gas controls. (SeeFig.1.)
shutdon, normal: shutting off fuel and ignition energyto the burner by means of an operating control.
shutdon, safefy: shutting off all fuel and ignition energyto the burner by means of a safety control or a primarsafety control (see also lockouf).
swifchi, air flot: a device used to prove the floww of air.
switch,high oil femperature: a temperature-actuateddevice arranged to stop the flow of fuel to a preheated oil burner or to prevent it from starting when the fueloil temperature rises above a set point which shall bethe upper end of the viscosity range recommended bythe burner manufacturer.
switch, high-pressure: a pressure-actuated device to moni-tor liquid, steam, or gas pressure and arranged to stopthe flow of fuel to the burner at a preset high pressure.switch, low oil temperature: a temperature-actuated devicearranged to stop the flow of fuel to a preheated oilburner or to prevent it from starting when the fuel oiltemperature falls below a set point which shall be thelower end of the viscosity range recommended by theburner manufacturer.
switch, low-pressure: a pressure-actuated device to monitor liquid, steam, or gas pressure and arranged to stopthe flow of fluid to the burner at a preset low pressureswitch, pressure: a pressure-responsive device that makesor breaks an electrical circuit and may be automaticallyor manually reset.
time delay: a deliberate delay of a predetermined timein the action of a safety device or control.UL: Underwriters Laboratories, Inc.
upper set point limit: on a temperature or pressure controlhaving an adjustable range of set points, the upper setpoint limit is the maximum pressure or temperature setpoint in the range of the control, to which the controlcan be adjusted and still perform its intended function(i.e., safety shutdown).