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UL 372

UL Standard for Safety Automatic Electrical Controls for Household and Similar Use – Part 2: Particular Requirements for Burner Ignition Systems and Components

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Organization: UL
Publication Date: 31 July 2007
Status: inactive
Page Count: 132
scope:

This standard modifies or amends the requirements of the Part 1 standard. In Canada the Part 1 standard applicable is CAN/CSA E60730-1, Automatic electrical controls for household and similar use - Part 1: General Requirements, and in the U.S. the Part 1 standard applicable is UL 60730-1A , Automatic electrical controls for household and similar use - Part 1: General Requirements, 3rd Edition.

This standard applies to newly produced automatic burner ignition systems and system components constructed entirely of new, unused parts and materials for the automatic control of burners for one or more of the following fuels:

oil,

natural gas,

manufactured gas,

mixed gas,

liquefied petroleum gas or,

LP gas-air mixtures

This standard is applicable to a complete burner ignition system, a separate programming unit, an oxygen depletion safety shutoff system and components that perform one or more of the following functions:

a) Ignite the fuel at the main burner(s), or at the pilot burner(s) so it can ignite the main burner(s);

b) Prove the presence of either the ignition source, the main burner flame, or both;

c) Automatically act to shut off the fuel supply to the main burner(s), or to the pilot and main burner(s), when the supervised flame or ignition source is not proved; and

d) Automatically act to shut off the gas supply to the pilot and main burner(s), when the oxygen content of the room in which the equipment is installed is reduced below a predetermined level.

Components can be, but are not limited to: automatic controls; pilot burners, thermoelectric devices, electrodes, ignition devices, ignition sources and flame detectors.

Throughout this standard the following terms shall be abbreviated as shown below:

1. "system" means "burner ignition system."

2. "component" means "burner ignition system component."

3. "control" means "system" or "component."

Requirements for separate ignition transformers are covered in Standard for Specialty Transformers, UL 506, and CSA C22.2 No. 13, the Standard for Luminous Tube Signs, Oil and Gas Burner Ignition Equipment, Cold-Cathode Interior Lighting.

This standard applies to inherent safety; to the manufacturer's declared operating values, operating times and operating sequences where such are associated with burner safety and to the testing of systems and components used in, on, or in association with burners.

Requirements for specific operating values, operating times, and operating sequences are given in the standards for appliances and equipment.

This standard applies to manual controls when such are electrically and/or mechanically integral with automatic systems.

This Standard applies to starting relays, which are a specific type of automatic ELECTRICAL CONTROL, intended to switch the starting winding of a motor. Such controls may be built into, or be separate from, the motor.

This Standard applies to MANUAL CONTROLS when such are electrically and/or mechanically integral with AUTOMATIC CONTROLS.

Requirements for manual switches not forming part of an AUTOMATIC CONTROL are contained in IEC 61058-1.

This standard applies to each component of an automatic burner ignition system shall be capable of operation throughout an ambient temperature range of 32°F (0°C) to 125°F (51.5°C). The manufacturer is allowed to specify temperatures below 32°F (0°C) and above 125°F (51.5°C).

a) For gas fired equipment rated 400,000 Btu/hr (117 228 W) or less, Tmin, and Tmax are as specified in 1.1.5A; and

b) For burner controls for all other equipment, Tmax, declared at less than 150°F (65.5°C) shall be tested at 150°F (65.5°C) or higher as specified by the manufacturer.

This standard applies to controls with a RATED VOLTAGE not exceeding 690 V and with a RATED CURRENT not exceeding 63 A.

The maximum voltage is 600 V. The maximum current is unlimited.

Controls intended for connection to ISOLATED LIMITED SECONDARY CIRCUITS operating at a voltage between conductors or between a conductor and earth not exceeding 42,4 V a. c. peak, or 60 V d. c., are not subject to the requirements of this Standard.

However, such controls, where they are associated with the safety of the controlled equipment; such as cut-outs; burner control systems; fuel valves and the like; shall be subject to the requirements of this Standard.

For the purposes of this requirement the ISOLATED LIMITED SECONDARY CIRCUIT shall have a capacity of 100 V A or less and shall be:

a) Inherently limited to such that the output current under any condition of load, including short circuit is not more than 8 A after 1-minute of OPERATION if the source is a. c. or the open-circuit voltage is 0-30 V d. c.; and not more than 150/Vmax amperes where Vmax is the open-circuit voltage over 30 V but less than or equal to 60 V d.c., or

b) Provided with a protective device rated 5 A if the open-circuit voltage is 0-21,2 V or 3,2 A if the open-circuit voltage is greater than 21,2 and less than or equal to 42,4 V.

This Standard does not take into account the RESPONSE VALUE of an AUTOMATIC ACTION of a control, if such a RESPONSE VALUE is dependent upon the method of mounting the control in the equipment. Where a RESPONSE VALUE is of significant purpose for the protection of the USER, or surroundings, the value defined in the appropriate household equipment standard or as determined by the manufacturer shall apply.

Compliance with this Part 2 standard does not imply that such a control is acceptable for use on fuel burning appliances or equipment without supplemental test with the device(s) applied to the particular appliance or equipment design.

All specifications as to construction set forth herein may be satisfied by the construction actually prescribed or such other construction as will provide at least equivalent performance.

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.

This standard applies also to controls incorporating electronic devices, requirements for which are contained in annex H, Requirements for electronic systems and components.

Document History

July 31, 2007
UL Standard for Safety Automatic Electrical Controls for Household and Similar Use – Part 2: Particular Requirements for Burner Ignition Systems and Components
This clause of part 1 is applicable except as follows: Replacement: This standard modifies or amends the requirements of the Part 1 standard. In Canada the Part 1 standard applicable is CAN/CSA...
UL 372
July 31, 2007
UL Standard for Safety Automatic Electrical Controls for Household and Similar Use – Part 2: Particular Requirements for Burner Ignition Systems and Components
This standard modifies or amends the requirements of the Part 1 standard. In Canada the Part 1 standard applicable is CAN/CSA E60730-1, Automatic electrical controls for household and similar use –...
July 31, 2007
UL Standard for Safety Automatic Electrical Controls for Household and Similar Use – Part 2: Particular Requirements for Burner Ignition Systems and Components
Preface This ANSI Standard, ANSI Z21.20, Automatic Electrical Controls for Household and Similar Use – Part 2: Particular Requirements for Burner Ignition Systems and Components, is to be used in...
372
February 11, 1994
UL Standard for Safety Primary Safety Controls for Gas- and Oil-Fired Appliances
A description is not available for this item.
372
February 11, 1994
UL Standard for Safety Primary Safety Controls for Gas- and Oil-Fired Appliances
A description is not available for this item.
February 11, 1994
UL Standard for Safety Primary Safety Controls for Gas- and Oil-Fired Appliances
These requirements cover primary safety controls for gas, gas-oil, and oil-fired appliances. These safety controls are intended to sense the presence or absence of flame and, in the event of ignition...
372
January 1, 1994
UL Standard for Safety Primary Safety Controls for Gas- and Oil-Fired Appliances
A description is not available for this item.

References

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