UL Standard for Safety Heating and Cooling Equipment
|Publication Date:||29 September 1995|
These requirements apply to the following stationary equipment for use in nonhazardous locations rated 7200 V or less, single- or 3-phase, and remote control assemblies for such equipment:
a) Heat pumps, for heating and cooling with or without factory or field-installed electric resistance heaters, or hot water or steam heating coils.
b) Air conditioners for cooling with or without factory or field-installed electric resistance heaters, or hot water or steam heating coils.
c) Cooling portion and associated components of combination heating and cooling equipment employing gas-, oil-, or gas-oil-fired heating means. However, the requirement for the construction and performance of the gas-, oil-, or gas-oil-fired heating means, and their associated components, shall conform to the particular standards covering such heating equipment and components.
d) Liquid chillers and compressor-evaporato
e) Condensing units intended for connection to a remote nonspecified evaporator and compressor units intended for connection to a remote nonspecified evaporator and condenser.
f) Add-on heat pumps for comfort heating or heating and cooling.
g) Heat pump water heaters and refrigerant desuperheaters, and packaged heat pump water heaters consisting of a heat pump water heater and an associated storage tank.
h) Fan units and fan coil units for comfort heating and/or comfort cooling.
i) Room fan heater units, central heating furnaces, and similar fixed electric space heating for comfort heating.
The units referenced in Clause 1.1(g) may be cord-connected if they
a) are for indoor use only;
b) are rated 250 V or less, single phase, with a marked rating of 24 A or less; and
c) comply with Clause 1.11.
A fan unit includes a motor-operated fan or blower, and is intended to be connected to a duct system that supplies conditioned air for environmental heating and/or cooling. Such a unit may have air-controlled dampers, but does not include a factory-installed heat exchanger or any other integral heating or cooling means.
A fan coil unit includes a motor-operated fan or blower together with a cooling coil, a heating coil, or both. The fan or blower is intended to recirculate air, and may introduce air from outside of the heated or cooled space. The coil may be used for refrigerant cooling, for chilled water cooling, for hot water heating, for steam heating, or for combinations of these functions.
A fan coil unit is intended to be piped to a remote source of the heating and/or cooling mediums. A unit that includes an electric resistance heater is considered to be a fan coil unit if a water or refrigerant coil for comfort cooling and/or a water or steam coil for comfort heating is provided in the unit.
A room fan heater unit is intended for heating only, includes a motor-operated fan or blower, employs electric resistance heat as the only heat source, and is intended to serve only one room or space.
A fan coil unit or electric space heating equipment, as covered by these requirements, may be designed for free discharge of air to the room or may be provided with means for duct connection.
A central warm air furnace is a heating appliance that consists of an
electric heating element or
elements with an air-circulating fan or blower, is provided with
appropriate integral operating and
The units referenced in Clause 1.1 may consist of one or more factory-made assemblies. If provided in more than one assembly, the separate assemblies are to be used together, and the requirements are based on the use of matched assemblies. These requirements apply to assemblies designed for free discharge of air into the conditioned space as well as those which may be provided with means for duct connection.
These requirements do not apply to add-on heat pump systems designed to utilize the indoor fan motor assembly of an installed furnace where
a) the heat pump and furnace are intended to operate simultaneously during heating operation except as noted in the Exception to Clause 26.14; or
b) the refrigerant coil is intended to be mounted upstream (return air side) of the furnace.
These requirements apply to equipment designed to be used in nonhazardous locations in accordance with the Rules of the Canadian Electrical Code, Part I; and requirements of the National Electrical Code, ANSI/NFPA No. 70; the Mechanical Refrigeration Code, CSA Standard 852, and the Safety Code for Mechanical Refrigeration, ANSI/ASHRAE 15; and the Standard for the Installation of Air Conditioning and Ventilating Systems, NFPA 90A; and the Standard for the Installation of Warm Air Heating and Air Conditioning Systems, NFPA 90B.
Note: Requirements for the installation of units designed to be connected to air duct systems are also included in codes such as the BOCA Basic National Mechanical Code, the Standard Mechanical Code, and the Uniform Mechanical Code.
The values given in SI (metric) units are the standard. The values given in parentheses are for information only.
Units intended for connection to telecommunication equipment shall have the appropriate assembly containing such circuitry meet the Standard for Telecommunication Equipment, CSA C22.2 No. 225, and Telephone Equipment, UL 1459.
The following Clauses or Sections of the CSA Standard General
a) "General Requirements", Section 3, and "Construction Details", Section 4 (refer to Sections 2 through 34 of this Standard);
b) "Marking Requirements", Section 5 (refer to Sections 35, 36, and 37 of this Standard);
c) "Tests", Section 6 (refer to Sections 38 through 69 of this Standard).
These requirements do not cover panel or cable type radiant heating equipment, electric boilers, baseboard heaters, air heaters, duct heaters, and unit coolers for refrigeration purposes, nor any other electric heating equipment or appliances which are covered in or as a part of separate, individual standards.
A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this Standard, and that involve a risk of fire, electric shock, or injury to persons, shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of this Standard. A product whose features, characteristics, components, materials, or systems conflict with specific provisions of this Standard cannot be judged to comply with this Standard. Where considered appropriate, revisions of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard.