• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects General Contractor Building Official & Plans Examiner Inspectors Owner Subcontractors Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Suggested code sections
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

1003.2.1 Automatic Boilers

California Mechanical Code 2019 > 10 Boilers and Pressure Vessels > 1003.0 Detailed Requirements > 1003.2 Controls > 1003.2.1 Automatic Boilers
JUMP TO FULL CODE CHAPTER
Automatic boilers shall be equipped with controls and limit devices in accordance with ASME CSD-1 or Table 1003.2.1.

     The Authority Having Jurisdiction shall have the authority to approve solid-fuel-fired boilers that comply with the safety requirements for automatic gas fired boilers or oil fired boilers.

TABLE 1003.2.1
CONTROLS AND LIMIT DEVICES FOR AUTOMATIC BOILERS
BOILER GROUP FUEL FUEL INPUT RANGE1 (INCLUSIVE), BTU/H TYPE OF PILOT2 SAFETY CONTROL TIMING (NOMINAL MAXIMUM TIME IN SECONDS) ASSURED FUEL SUPPLY CONTROL4 ASSURED AIR SUPPLY CONTROL5 LOW FIRE START UP CONTROL6 PRE-PURGING CONTROL7 HOT WATER TEMPERATURE AND LOW WATER LIMIT CONTROLS8 STEAM PRESSURE AND LOW WATER LIMIT CONTROLS9 APPROVED FUEL SHUT OFF10 CONTROL AND LIMIT DEVICE SYSTEM DESIGN11
TRIAL FOR PILOT TRIAL FOR MAIN BURNER FRAME MAIN BURNER FLAME FAILURE3
DIRECT ELECTRIC IGNITION FLAME PILOT
A Gas 0 - 400000 Any type 90 Not
Required
90 90 Not
Required
Required Not
Required
Not
Required
Required Required Not
Required
Required
B Gas 400001 - 2500000 Interrupted
or Intermittent
15 15 15 2-4 Not
Required
Required Not
Required
Not
Required
Required Required Not
Required
Required
C Gas 2500001 - 5000000 Interrupted
or Intermittent
15 15 15 2-4 Required Required Required Required Required Required Required Required
D Gas Over 5000000 Interrupted 15 15 15 2-4 Required Required Required Required Required Required Required Required
E Oil 0 - 400000 Any type Not
Required
90 90 90 Not
Required
Required Not Required Not
Required
Required Required Not
Required
Required
F Oil 400001 - 1000000 Interrupted Not
Required
30 30 2-4 Required Required Not
Required
Not
Required
Required Required Not
Required
Required
G Oil 1000001 - 3000000 Interrupted Not
Required
15 15 2-4 Required Required Not '
Required
Not
Required
Required Required Not
Required
Required
H Oil Over 3000000 Interrupted 15 15 60 2-4 Required Required Required Required Required Required Required Required
K Electric All Not required Not required Not required Not required Not required Not required Not required Not required Not required Required Required Not
Required
Required
L Gas, Oil and/or Coal 12500000 or more Any 10 sec Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per ASME Power
Boiler Code, Section 1 and NFPA 85
Per ASME Power
Boiler Code, Section 1 and NFPA 85
Per NFPA 85 Per NFPA 85
M Heat Recovery
Steam Generator
Any None Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per NFPA 85 Per ASME Boiler & Pressure Code & NFPA 85 Per ASME Boiler
& Pressure Code & NFPA 85
Per NFPA 85 Per NFPA 85
For SI units: 1000 British thermal units per hour = 0.293 kW
  1. 1 Fuel input shall be determined by one of the following:

    The burner input shall not exceed the input shown on the burner nameplate or as otherwise identified by the manufacturer.
    The nominal boiler rating, as determined by the building official, plus 25 percent.
  2. 2 Automatic boilers shall have one flame failure device on each burner, which shall prove the presence of an ignition source at the point where it will ignite the main burner, except that boiler groups A, B, E, F, and G, which are equipped with direct electric ignition, shall monitor the main burner, and boiler groups using interrupted pilots shall monitor the main burner after the prescribed limited trial and ignition periods. Boiler group A, equipped with continuous pilot, shall accomplish 100 percent shutoff within 90 seconds upon pilot flame failure. The use of intermittent pilots in boiler group C is limited to approved burner units.
  3. 3 In boiler groups B, C, and D a 90 second main burner flame failure limit shall be permitted to be applied where continuous pilots are provided on manufacturer assembled boiler-burner units that have been approved by an approved testing agency in accordance with nationally recognized standards approved by the building official. Boiler groups F and G equipped to re-energize their ignition systems within 0.8 second after main burner flame failure will be permitted 30 seconds for group For 15 seconds for group G to re-establish their main burner flames.
  4. 4 Boiler groups C and D shall have controls interlocked to accomplish a non-recycling fuel shutoff upon high or low gas pressure, and boiler groups F, G, and H using steam or air for fuel atomization shall have controls interlocked to accomplish a nonrecycling fuel shutoff upon low atomizing steam or air pressure. Boiler groups F, G, and H equipped with a preheated oil system shall have controls interlocked to provide fuel shutoff upon low oil temperature.
  5. 5 Automatic boilers shall have controls interlocked to shut off the fuel supply in the event of draft failure where forced or induced draft fans are used or, in the event of low combustion airflow, where a gas power burner is used. Where a single motor directly driving both the fan and the oil pump is used, a separate control is not required.
  6. 6 Boiler groups C, D, and H, where firing in excess of 400000 Btu/h (117 kW) per combustion chamber, shall be provided with low fire start of its main burner system to permit smooth light-off. This will normally be a rate of one-third of its maximum firing rate.
  7. 7 Boiler groups C, D, and H shall not permit pilot or main burner trial for ignition operation before a purging operation of sufficient duration to permit not less than four complete air changes through the furnace, including a combustion chamber and the boiler passes. Where this is not readily determinable, five complete air changes of the furnace, including combustion chamber up to the first pass, will be considered equivalent. An atmospheric gas burner with no mechanical means of creating air movement or an oil burner that obtains two-thirds or more of the air required for combustion without mechanical means of creating air movement shall not require purge by means of four air changes, so long as its secondary air openings are not provided with means of closing. Where such burners have means of closing secondary air openings, a time delay shall be provided that puts these closures in a normally open position for four minutes before an attempt for ignition. An installation with a trapped combustion chamber shall, in every case, be provided with a mechanical means of creating air movement for purging.
  8. 8 An automatic hot-water-heating boiler, low-pressure hot-water-heating boiler, and power hot water boiler shall be equipped with two high-temperature limit controls with a manual reset on the control, with the higher setting interlocked to shut off the main fuel supply, except that manual reset on the high-temperature limit control shall not be required on an automatic package boiler not exceeding 400 000 Btu/h (117 kW) input and that has been approved by an approved testing agency. An automatic hot-water heating, power boiler, and package hot-water supply boiler shall be equipped with one low-water level limit control with a manual reset interlocked to shut off the fuel supply, so installed as to prevent damage to the boiler and to permit testing of the control without draining the heating system, except on boilers used in Group R Occupancies of less than six units and in Group U Occupancies and further, except that the low-water level limit control is not required on package hot-water supply boilers approved by a nationally recognized testing agency. However, a low-water flow limit control installed in the circulating water line shall be permitted to be used instead of the low-water level limit control for the same purpose on coil-type boilers.
  9. 9 An automatic low-pressure steam-heating boiler, small power boiler, and power steam boiler shall be equipped with two high-steam pressure limit controls interlocked to shut off the fuel supply to the main burner with manual reset on the control, with the higher setting and two low-water-level limit controls, one of which shall be provided with a manual reset device and independent of the feed water controller. Coil-type flash steam boilers shall be permitted to use two high-temperature limit controls, one of which shall be manually reset in the hot water coil section of the boiler instead of the low-water level limit control.
  10. 10 Boiler groups C, D, and H shall use an approved automatic reset safety shutoff valve for the main burner fuel shutoff, which shall be interlocked to the programming control devices required. On oil burners where the safety shutoff valve will be subjected to pressures in excess of 10 psi (69 kPa) where the burner is not firing, a second safety shutoff valve shall be provided in series with the first. Boiler groups C and D using gas in excess of 1 psi (7 kPa) pressure or having a trapped combustion chamber or employing horizontal fire tubes shall be equipped with two approved safety shutoff valves, one of which shall be an automatic reset type, one of which shall be permitted to be used as an operating control, and both of which shall be interlocked to the limit-control devices required. Boiler groups C and D using gas in excess of 1 psi (7 kPa) pressure shall be provided with a permanent and ready means for making periodic tightness checks of the main fuel safety shutoff valves.
  11. 11 Control and limit device systems shall be grounded with operating voltage not to exceed 150 volts, except that, upon approval by the building official, existing control equipment to be reused in an altered boiler control system shall be permitted to use 220 volts single phase with one side grounded, provided such voltage is used for all controls. Control and limit devices shall interrupt the ungrounded side of the circuit. A readily accessible means of manually disconnecting the control circuit shall be provided with controls so arranged that where they are de-energized, the burner shall be inoperative.

Related Code Sections


1003.2.1 Boilers and Pressure Vessels, Automatic Boilers
Automatic boilers shall be equipped with controls and limit devices in accordance with ASME CSD-1 or Table 1003.2.1.     The ...
California Mechanical Code 2016 > 10 Boilers and Pressure Vessels > 1003.0 Detailed Requirements > 1003.2 Controls > 1003.2.1 Automatic Boilers
1003.2.1 Boilers and Pressure Vessels, Automatic Boilers
Automatic boilers shall be equipped with controls and limit devices in accordance with ASME CSD-1 or Table 1003.2.1 ...
California Mechanical Code 2019 > 10 Boilers and Pressure Vessels > 1003.0 Detailed Requirements > 1003.2 Controls > 1003.2.1 Automatic Boilers
1013.6 Boilers and Pressure Vessels, Automatic Steam-Heating Boilers
Automatic steam-heating boilers shall be inspected externally biennially. Where construction and operating conditions permit, they shall be subject ...
California Mechanical Code 2016 > 10 Boilers and Pressure Vessels > 1013.0 Inspections and Tests > 1013.6 Automatic Steam-Heating Boilers
1013.6 Boilers and Pressure Vessels, Automatic Steam-Heating Boilers
Automatic steam-heating boilers shall be inspected externally biennially. Where construction and operating conditions permit, they shall be subject ...
California Mechanical Code 2019 > 10 Boilers and Pressure Vessels > 1013.0 Inspections and Tests > 1013.6 Automatic Steam-Heating Boilers
1003.0 Boilers and Pressure Vessels, Detailed Requirements
Automatic boilers shall be equipped with controls and limit devices in accordance ...
California Mechanical Code 2019 > 10 Boilers and Pressure Vessels > 1003.0 Detailed Requirements
Help Contact Us Privacy Terms
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
View thousands of relevant UL Certified products and assemblies that help achieve code compliance
View thousands of relevant UL Certified products and assemblies that help achieve code compliance
Access to UL product and system certification information.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Code Compare
Code Compare
Highlight differences between any two building codes.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
TRY FREE FOR TWO WEEKS VISIT PRICING
Join the waitlist
We are looking to gauge the level of interest in linking UL product and system certification information alongside related code sections.

Let us know your email and we’ll ping you once it’s ready! Learn more.

Thank you for your interest!

If you’re open to it, we would love to jump on the phone to make sure we’re building this in the best way possible for your workflow. Any insight or advice would be greatly appreciated. We’ve sent you an email with a calendar link to book at time with us.


Cancel
Get Early Access
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL LEARN MORE