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UL 372 Document Information:
Title
UL Standard for Safety Automatic Electrical Controls for Household and Similar Use – Part 2: Particular Requirements for Burner Ignition Systems and Components
Underwriters Laboratories Inc.
Publication Date:
Jul 31, 2007
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.
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