1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2106 Field Erected Boiler AssembliesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTH
2、ER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Field Erected Boiler Assemblies, UL 2106 Second Edition, Dated April 18, 2006 Summary of Topics This revision to UL 2106 is being issued to remove the reference to the withdrawal date of UL 873 and to address unive
3、rsal upkeep of UL Standards for Safety. These revisions are considered to be non-substantive and not subject to ULs STP process. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked w
4、ith a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form
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10、UPERSEDED REQUIREMENTS notice. MARCH 9, 2015 UL 2106 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 9, 2015 UL 2106 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PER
11、MISSION FROM UL APRIL 18, 2006 (Title Page Reprinted: March 9, 2015) 1 UL 2106 Standard for Field Erected Boiler Assemblies First Edition October, 1994 Second Edition April 18, 2006 This UL Standard for Safety consists of the Second edition including revisions through March 9, 2015. Comments or prop
12、osals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy o
13、f a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIS
14、TRIBUTION WITHOUT PERMISSION FROM UL APRIL 18, 2006 FIELD ERECTED BOILER ASSEMBLIES - UL 2106 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 General 6 2.1 Terminology .6 2.2 Units of
15、measurement .6 3 Glossary .6 4 Components 9 CONSTRUCTION MECHANICAL 5 Assembly .10 5.1 General 10 5.2 Moving parts 11 6 Servicing 12 7 Casing 13 8 Radiation Shields or Liners 13 9 Combustion Chamber 14 10 Baffles.14 11 Flue Collar .14 12 Damper and Draft Regulator .14 13 Installation of External Con
16、trols and Fittings 15 14 Field Wiring System Connection 16 CONSTRUCTION ELECTRICAL 15 Controls .16 15.1 Application 16 15.2 Limit control .17 15.3 Primary safety control .18 15.4 Liquid level limit controls 18 15.5 Temperature limit controls .19 15.6 Purge and combustion air monitoring controls .19
17、16 Field Wiring 19 16.1 General .19 16.2 Leads and terminals 21 17 Internal Wiring 23 17.1 General .23 17.2 Methods 23 17.3 Short-circuit protection 26 18 Separation of Circuits .27 19 Bonding for Grounding 28 20 Servicing and Adjustment 31 21 Electrical Components .32 22 Mounting of Electrical Comp
18、onents .32 23 Electrical Enclosures 33 23.1 General .33 23.2 Doors and covers 36 24 Motors and Motor Overload Protection 37 25 Overcurrent Protection of High-Voltage Control-Circuit Conductors 42 APRIL 18, 2006 FIELD ERECTED BOILER ASSEMBLIES - UL 2106 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FUR
19、THER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 25.1 General .42 25.2 Direct-connected high-voltage control circuit .42 25.3 Tapped high-voltage control circuits 42 25.4 Overcurrent-protective devices .43 26 Overcurrent Protection of Transformers 44 26.1 High-voltage transformers .44 26
20、.2 Low-voltage transformers 45 27 Switches and Controllers 46 28 Capacitors .46 29 Electrical Insulating Material 47 30 Spacings High-Voltage Circuits .47 31 Spacings Low-Voltage Circuits 49 32 Accessibility of Uninsulated Live Parts and Film-Coated Wire 49 32.1 General .49 32.2 Boilers having an in
21、put in excess of 400,000 Btu/h .52 32.3 Boilers having an input of 400,000 Btu/h or less .55 PERFORMANCE 33 General 58 34 Dielectric Voltage-Withstand Test .59 MANUFACTURING AND PRODUCTION TESTS 35 General 59 MARKING 36 General 60 INSTRUCTIONS 37 Operating and Installation Instructions .63 APPENDIX
22、A Standards for ComponentsA1 APRIL 18, 2006 FIELD ERECTED BOILER ASSEMBLIES - UL 2106 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements apply to eld assembled boiler assemblies that are provided wit
23、h or are intended for installation with single fuel-gas, single fuel-oil, or combination gas-oil burning equipment. 1.2 These requirements apply to fuel burning equipment which require ame failure and other safeguards and which are intended primarily for commercial and industrial installation. 1.3 E
24、quipment covered by these requirements may be operated without a competent attendant being constantly on duty at the equipment while the burners are in operation. 1.4 The appliance shall be suitable for installation in accordance with the Standards for Installation of Oil-Burning Equipment, NFPA 31,
25、 and/or National Fuel Gas Code, NFPA 54, and the National Electrical Code, NFPA 70-1993. 1.5 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of re or of electric sh
26、ock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conict with specic re
27、quirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard. 1.6 Equipment covered by these requirements shall be designed,
28、 assembled, tested, and inspected in accordance with the requirements of Section I or Section IV of the ASME Boiler and Pressure Vessel Code. Conformance with the code will be determined by application of the Ho rS stamp and, if applicable the A symbol stamp on the appropriate part of the boiler ass
29、embly. 1.7 Each eld erected boiler shall undergo a nal inspection following completion of eld assembly, ASME code required testing and inspection, and operational testing. The inspection shall cover all points required by the authority having jurisdiction. APRIL 18, 2006 FIELD ERECTED BOILER ASSEMBL
30、IES - UL 2106 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 General 2.1 Terminology 2.1.1 The term appliance or boiler assembly refers to any equipment covered by this Standard. 2.1.2 The terms combustible and noncombustible as used in
31、these requirements, are dened in the Glossary of Terms Relating to Chimneys, Vents, and Heat-Producing Appliances, ANSI/NFPA 97M-1988. 2.2 Units of measurement 2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3 Glossary 3.
32、1 For the purpose of this Standard the following denitions apply. 3.2 APPLIANCE FLUE The ue passages within the appliance. 3.3 BAFFLE An object placed in an appliance to direct the ow of air or ue gases. 3.4 BOILER A closed vessel in which water or some other liquid is heated or in which steam is ge
33、nerated or superheated, under pressure or vacuum, by direct application of heat. 3.5 BOILER ASSEMBLY A boiler assembly as dened herein equipped with one or more burners of either the oil or gas type, and all necessary safety controls, electrical equipment as needed, and related equipment, manufactur
34、ed for assembly as a unit. 3.6 BOILER, HIGH PRESSURE STEAM A boiler in which steam is generated at a pressure higher than 15 psig (103 kPa gauge). 3.7 BOILER, HIGH TEMPERATURE WATER A boiler intended for operation at a pressure exceeding 160 psig (1103 kPa gauge) or at a temperature exceeding 250F (
35、121C) or both. 3.8 BOILER, HOT WATER A boiler that furnishes hot water at a pressure not exceeding 160 psig (1103 kPa gauge) and at a temperature not exceeding 250F (121C). 3.9 BOILER, LOW PRESSURE STEAM A boiler in which steam is generated at a pressure not exceeding 15 psig (103 kPa gauge). 3.10 C
36、ASING An enclosure forming the outside of the appliance, no parts of which are likely to be subjected to intense heat. 3.11 COMBUSTIBLE MATERIAL Combustible material as pertaining to materials adjacent to or in contact with heat-producing appliances, chimney connectors and vent connectors, steam and
37、 hot water pipes, refers to material made of or surfaced with wood, compressed paper, plant bers, or other material that will ignite and burn. Such material shall be considered as combustible even through ameproofed, re-retardant treated, or plastered. 3.12 COMBUSTION CHAMBER The portion of an appli
38、ance within which combustion occurs. APRIL 18, 2006 FIELD ERECTED BOILER ASSEMBLIES - UL 2106 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.13 CONTROL, LIMIT An automatic safety control, responsive to changes in liquid level, pressure,
39、or temperature, for limiting the operation of the controlled equipment. 3.14 CONTROL, SAFETY Automatic controls, including relays, switches, and other auxiliary equipment used in conjunction therewith to form a safety control system, that is intended to reduce the risk of re, electric shock, or inju
40、ry to persons during operation of the controlled equipment. 3.15 CONTROL, PRIMARY SAFETY An automatic control that monitors the operation of a gas-red or an oil-red burner. It normally consists of the following sections that may be integrated into a common unit or may be separate units, interconnect
41、ed by wiring: a) Programming Unit A device that programs the burner through start-up and shutdown operations in response to signals from regulating, limiting, and monitoring devices. It also provides the necessary timings, in proper sequence, for purging, pilot ame ignition, main ame ignition, and i
42、n case of ignition or ame failure, for safety shutdown (lockout). b) Combustion Detector A device that is responsive to ame properties. It monitors the ame at the point of ame supervision and transmits a signal to the programming unit, indicating absence or presence of ame. 3.16 CONTROL, SAFETY COMB
43、USTION A primary safety control responsive directly to ame properties, sensing the presence of ame and causing fuel to be shut off in event of ame failure. 3.17 DAMPER A valve or plate for regulating draft or ow of ue gases. A damper is generally considered as being located on the downstream side of
44、 the combustion chamber, usually in a ue passage of the appliance or in the chimney connector. 3.18 DAMPER, AUTOMATICALLY OPERATED A damper operated by an automatic control. 3.19 DAMPER, MANUALLY OPERATED An adjustable damper manually set and locked in the desired position. 3.20 DRAFT The differenti
45、al in static pressure available, between any two locations, to provide the energy potential for the moving of air for combustion or products of combustion through a fuel-burning heat-exchanging apparatus, or both. 3.21 DRAFT REGULATOR A device which functions to maintain a desired draft in the appli
46、ance by automatically reducing the chimney draft to the desired value. 3.22 ELECTRICAL CIRCUITS: a) High-Voltage Circuit A circuit involving a potential of not more than 600 volts and having circuit characteristics in excess of those of a low-voltage circuit. b) Low-Voltage Circuit A circuit involvi
47、ng a potential of not more than 30 volts alternating- current (42.4 volts peak) or direct current and supplied by: 1) A Class 2 transformer, or by a battery, by a battery and xed impedance, or by a transformer and xed impedance each of which, as a unit is in compliance with what is required for a Cl
48、ass 2 transformer, or APRIL 18, 2006 FIELD ERECTED BOILER ASSEMBLIES - UL 2106 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2) Is limited to a maximum of 100 volt-amperes. A circuit derived from a source of supply classied as a high-volt
49、age circuit, by connecting resistance in series with the supply circuit as a means of limiting the voltage and current, is not considered to be a low-voltage circuit. c) Safety Control Circuit A circuit involving one or more safety controls. 3.23 FLUE A general term for the conduit or passageway through which ue gases pass from the combustion chamber to the outside air. 3.24 FLUE COLLAR That portion of an applia
