ASME CSD-1–2021 pdf free.Controls and Safety Devices for Automatically Fired Boilers.
CE-110 General ð21Þ Installation requirements shall applyto controls, safety devices, and burners on automatically fired boilers covered by this Standard. For information regarding boiler and/or burner instal- lations, refer to local codes. In the absence oflocal codes, see NFPA 70. (a) A disconnecting means capable of being locked in the open position shall be installed at an accessible loca- tion at the boiler so that the boiler can be disconnected from all sources of potential. This disconnecting means shall be an integral part of the boiler or adjacent to it. (b) A manually operated remote shutdown switch or circuit breaker shall be located just outside the boiler room door and marked for easy identification. (1) Consideration should be given to the type and location of the remote shutdown switch to safeguard against tampering. If the boiler room door is on the building exterior, the switch should be located just inside the door. If there is more than one door to the boiler room, there should be a remote shutdown switch located at each door. (2) Activation of the remote shutdown switch or circuit breaker shall immediately shut off the fuel or energy supply. (3) For installations not in a boiler or equipment room, such as outdoors at ground level or on roof top, the manually operated remote shutdown switch(es) or circuit breaker(s) shall be accessible and located at a safe distance as defined by the authority having jurisdic- tion. (c) All uninsulated live metal parts and all rotating or moving parts that may cause injury shall be guarded to avoid accidental contact. (d) The electrical equipment shall be arranged so that failure ofthis equipmentwill cause the fuel supplyto shut off.
(1) One side ofall coils shall be electricallylocated in the grounded side ofthe circuit. All switches, contacts, and overcurrent devices shall be electrically located in the ungrounded or “hot” side of the circuit. (2) All electrical contacts of every safety device installed in the same control circuit shall be electrically connected in series. (f) All electrical components and devices shall have a voltage rating commensurate with the supply voltage of the control system. (g) All electrical components and devices shall be provided with an electrical enclosure that is at least NEMA Type 1 (general purpose). Where electrical devices will be subject to dripping moisture, the enclo- sures shall be at least NEMA Type 2 (drip-tight). (h) All electrical control devices shall be labeled and listed. (i) The design ofthe control circuits shall be such that limit and primary safety controls shall directly open a circuit that interrupts the supply of fuel to combustion units. (j) Automatic resetting devices, controls, or switches shall be installed in accordance with the instructions of the combustion safeguard control manufacturer. No auto- matic resettingdevice, control, or switch shall be installed in the wiring between the load side (terminal) of the primary or programming control and the main or ignition fuelvalve orvalves. This does notprecludetheinstallation of manually operated test switches for the purposes of testing tight closure of individual fuel valves.ASME CSD-1 pdf download.