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CLASS 236,	AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION
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SECTION I - CLASS DEFINITION

This class relates only to automatic temperature and humidity regulation, and is not to include the system where the thermostatic control constitutes but an element of the system, even though the system includes temperature regulation, such, for example, as refrigeration, where the refrigerating structure or method is claimed. Systems are also excluded where the specific burner structure, specific boiler structure, specific heat-exchange element, specific fire extinguishing structure, specific heat distributing system, specific internal-combustion engine structure, specific furnace structure, specific gas producer structure or method, specific heating and molding devices, etc., are claimed--that is, this class is confined to automatically operating temperature or humidity controlling mechanism, but excludes all patents to the specific mechanism controlled, even though the thermostat is claimed, either broadly or specifically, in combination therewith.

SECTION II - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

SUBCLASSES

1	MISCELLANEOUS:
	This subclass is indented under the class definition.  Subject matter not provided for in any of the following subclasses.

2	INCUBATOR TYPE OF HEATER:
	This subclass is indented under the class definition.  Subject matter for incubators. SEE OR SEARCH CLASS: 119,  Animal Husbandry,   subclasses 314 , 317, 319, for such devices having particular incubator structure. 237,  Heating Systems,   subclasses 3+ for the same with specific heating systems.

3	Electric:
	This subclass is indented under subclass 2.  Subject matter in which the controlling means is electrically operated. SEE OR SEARCH THIS CLASS, SUBCLASS: 74+, for the type of operating apparatus used.

4	Expanding fluid:
	This subclass is indented under subclass 2.  Subject matter in which the regulating means is operated directly by a thermostat of the expanding-fluid type.

5	Expanding solid:
	This subclass is indented under subclass 2.  Subject matter in which the regulating means is operated directly by a thermostat of the expanding solid type.

6	BROODER TYPE OF HEATER:
	This subclass is indented under the class definition.  Subject matter for brooder type of heaters not otherwise classifiable. SEE OR SEARCH CLASS: 119,  Animal Husbandry,   subclass 306 for such devices having particular brooder structure. See (1) note to that subclass definition. 237,  Heating Systems,   subclasses 3+ for the same with specific heating system.

7	SADIRON TYPE:
	This subclass is indented under the class definition.  Subject matter for self-heated sad-irons not otherwise classifiable. SEE OR SEARCH CLASS: 38,  Textiles: Ironing and Smoothing,   subclasses 82+ for such devices having particular iron structure. 219,  Electric Heating,   subclasses 490+ for heating systems of general utility with automatic control means, and appropriate subclasses for specific type electrical heating devices with automatic current, voltage or temperature control means.

8	ATOMIZER TYPE OF BURNER:
	This subclass is indented under the class definition.  Devices controlling the flow of steam or air and fuel to an atomizer type of burner, according to changes in pressure or temperature in the device heated. SEE OR SEARCH THIS CLASS, SUBCLASS: 26+, for controlling devices responsive to pressure changes in the closed fluid heater.

9	COMBINED HEATER AND APARTMENT CONTROLLED:
	This subclass is indented under the class definition.  Subject matter which are operated by devices responsive to temperature changes in a heater and also temperature changes in an apartment to be heated. SEE OR SEARCH THIS CLASS, SUBCLASS: 37, for control by radiator temperature and apartment temperature. 91, for other controls responsive to temperatures at different places.

10	HOT-AIR FURNACE:
	This subclass is indented under the class definition.  Subject matter comprising hot air furnaces which are provided with automatic temperature regulating means. In the devices of this subclass the fire is generally regulated by the temperature in the air space of the furnace.

11	Air and fire control:
	This subclass is indented under subclass 10.  Subject matter in which the fire and also the flow of the heating air through the air chamber of the furnace is controlled.

12.1	MIXING FLUID OF DISSIMILAR TEMPERATURE:
	This subclass is indented under the class definition.  Apparatus mixing fluid from two or more different supplies in which at least one of the supplies of the fluid is controlled according to the temperature of the mixed fluid or the temperature of one of the fluid supplies.

12.11	Mixing valve with temperature controlled motive means:
	This subclass is indented under subclass 12.1.  Apparatus comprising flow control means positively moved to an adjusted position by a motor means wherein the motor means is moved to the adjusted position by a medium or force controlled by but not resulting directly from a sensed temperature condition or a change in such a condition. (1) Note. Examples of motors to be found herein are electric motors controlled by thermostatic switches, fluid motors with independent sources of fluid pressure where a thermal responsive valve senses a system conditions and regulates fluid flow from said source to motor. (2) Note. A valve merely moved by a heat motor which directly senses a system condition and responds to move a valve, e.g., bimetal, closed fluid system with sensing bulb, etc., will not be found herein.

12.12	Having electrical motive means:
	This subclass is indented under subclass 12.11.  Apparatus comprising a motor means responding to electrical energy input for moving the flow control means.

12.13	Including bypass:
	This subclass is indented under subclass 12.1.  Apparatus in which the device is provided with separate controllable through passages, leading from a source of fluid, at least one of the passages having a valving means permitting said fluid to pass directly to a point of use, regardless of the temperature existing in the system, and at least one other passage being provided with means for controlling the flow of said fluid in response to a temperature condition or a change in temperature occurring at some point in the apparatus.

12.14	Fluid from only one supply is controlled:
	This subclass is indented under subclass 12.1.  Apparatus in which the flow of only one of the supplies is controlled by the sensed temperature condition of the mix.

12.15	Including separate relatively movable valve for each fluid supply:
	This subclass is indented under subclass 12.1.  Apparatus wherein the flow of each supply is controlled by a separate flow control member movable in response to fluid temperature. (1) Note. Each member may be movable in response to the temperature of either a respective fluid or a fluid mix.

12.16	Having oscillating or reciprocating valve:
	This subclass is indented under subclass 12.1.  Apparatus wherein a flow control means moves in a prescribed straight line or arcuate path of travel to control fluid flow.

12.17	Valving member moves about an axis:
	This subclass is indented under subclass 12.16.  Apparatus wherein the flow control means comprises a flow control portion movable in an arcuate path of travel.

12.18	Tubular valve member:
	This subclass is indented under subclass 12.17.  Apparatus wherein the flow control means comprises a hollow sleeve or cylinder like member or portion. (1) Note. A cup shape flow control means is proper for classification here if the sleeve or cylinder portion performs a flow control function. Otherwise classification will be based on other features.

12.19	Axially spaced flow faces:
	This subclass is indented under subclass 12.17.  Apparatus wherein the flow control means comprises a member having a seating face at each of its sides for coacting with seats on oppositely disposed fluid inlets.

12.2	Tubular valve member:
	This subclass is indented under subclass 12.16.  Apparatus wherein the flow control means comprises a hollow sleeve or cylinder-like member or portion.

12.21	Axially spaced flow control faces:
	This subclass is indented under subclass 12.16.  Apparatus wherein the flow control means comprises a movable valving member having a seating face at each end for coacting with seats on oppositely disposed fluid inlets.

12.22	Seats face outwardly:
	This subclass is indented under subclass 12.21.  Apparatus wherein the seating faces on the member are directed away from each other.

12.23	Ports closed by valve action:
	This subclass is indented under subclass 12.16.  Apparatus wherein the movable flow control means moves to and from contiguously along a surface having fluid ports therein for controlling fluid passing therethrough.

13	Plenum type:
	This subclass is indented under subclass 12.1.  Devices controlling the mixing of warm and cold air in the plenum type of heating systems according to the temperature of the hot or cold air, mixed air, or apartment to be heated.

14	COMBINED BOILER AND FURNACE CONTROLLED:
	This subclass is indented under the class definition.  Devices controlling the fire under a boiler according to conditions in the boiler and also according to conditions in the furnace. SEE OR SEARCH THIS CLASS, SUBCLASS: 15, for devices responsive to changes within the furnace. 20+, for control devices operated by changes in the boilers.

15	FURNACE CONTROLLED:
	This subclass is indented under the class definition.  Devices controlling the fire according to conditions in the furnace. SEE OR SEARCH THIS CLASS, SUBCLASS: 14, for controls responsive to boiler and furnace. 95, 96, for furnace control where the thermostat is attached to the outside of the heater or flue. 104, for furnace controls operated by the expansion or contractions of the furnace parts due to temperature changes.

16	COMBINED DRAFT AND CHECK CONTROL:
	This subclass is indented under the class definition.  Devices controlling the draft damper and check damper of a stove or furnace according to changes in the temperature of apartment or element heated.

17	Pressure-operated:
	This subclass is indented under the class definition.  Devices controlling the supply of heating fluid to an exchange or surface heater by the pressure of the fluid heated. SEE OR SEARCH THIS CLASS, SUBCLASS: 14, for the same combined with furnace control. 26+, for pressure operated closed fluid heater control. 85, for the control, per se.

18	Expanding fluid:
	This subclass is indented under the class definition.  Devices controlling the supply of heating fluid to an exchange or surface heater directly by means of a thermostat of the expanding fluid type responsive to the temperature of the fluid heated. SEE OR SEARCH THIS CLASS, SUBCLASS: 4, 42, 56+, 64, 95, and 99, for the type of thermostat used and control devices operated thereby. 32, for closed fluid heaters with similar controls. 93, for devices where flow is regulated by the temperature of the flowing fluid.

19	Expanding solid:
	This subclass is indented under the class definition.  Devices controlling the supply of heating fluid to an exchange or surface heater directly by means of a thermostat of the expanding solid type responsive to the temperature of the fluid heater. SEE OR SEARCH THIS CLASS, SUBCLASS: 5, 43, 59+, 66, 96, and 101, for the type of thermostat used and control devices operated thereby. 33, for closed fluid heaters with similar controls. 93, for devices where flow is regulated by the temperature of the flowing fluid.

20	CLOSED FLUID HEATERS:
	This subclass is indented under the class definition.  Devices controlling the temperature of the fluid heated.

21	Safety cut-out:
	This subclass is indented under subclass 20.  Devices controlling the heating means according to the conditions in the heater, with additional means for cutting out the regulating means under abnormal conditions, such as failure of the regulator, (as by rupture of the diaphragm, for example), the pressure exceeding a certain limit, the water-level falling below a certain limit, the temperature getting too high, or heating means failing. (1) Note. The regulator must generally be repaired or reset by hand. SEE OR SEARCH THIS CLASS, SUBCLASS: 89, for magnetic trip release controls with cut-out features. SEE OR SEARCH CLASS: 137,  Fluid Handling,   subclasses 59+ , 72+, 79+, 457, and 468 for thermally responsive valves in general.

22	Radiator type:
	This subclass is indented under subclass 20.  Combined radiators and heaters where the heater is controlled according to the temperature of the radiator. SEE OR SEARCH THIS CLASS, SUBCLASS: 26+, for heaters controlled by the pressure in the radiator. 32, 33, for heaters controlled by a thermostat. SEE OR SEARCH CLASS: 237,  Heating Systems,   subclass 7 for systems where the unit is specifically claimed.

23	One valve:
	This subclass is indented under subclass 20.  Devices in which the heating means, usually a gas-burner, is controlled by the combined action of a thermostat in the fluid heated and a flow-motor operated by the flow of the fluid heated, the thermostat and motor controlling the movement of a single control-valve.

24	Two or more valves:
	This subclass is indented under subclass 20.  Devices in which the heating means, usually a gas-burner, is controlled by the combined action of a thermostat in the fluid heated and a flow-motor operated by the flow of the fluid heated, the thermostat and motor operating on separate valves.

24.5	Flow and pressure controlled:
	This subclass is indented under subclass 20.  Devices in which the combined dynamic and static pressure of the fluid heated controls the heating means, and those in which this combined force is opposed by one of its elements alone or by a different combination of them.

25	Flow controlled:
	This subclass is indented under subclass 20.  Devices in which the heating means is controlled according to the rate of flow of the fluid heated. SEE OR SEARCH THIS CLASS, SUBCLASS: 23, 24, 24.5, and 45, for other temperature or humidity regulators comprising flow control of the regulator. SEE OR SEARCH CLASS: 137,  Fluid Handling,   subclasses 98+ , 458 to 460, 486+, 496, and 497+ for valves responsive to change in rate of flow.

26	Pressure-operated:
	This subclass is indented under subclass 20.  Devices not otherwise classifiable controlling the heating of the closed fluid-heater according to the pressure in the heater. SEE OR SEARCH THIS CLASS, SUBCLASS: 8, 14, 17, and 85, for other pressure operated controls.

27	With balancing pressure chamber:
	This subclass is indented under subclass 26.  Devices where the effect of the heater-pressure is counterbalanced by a closed pressure-chamber.

28	Stroke retarding:
	This subclass is indented under subclass 26.  Devices with means for increasing the resistance to movement of a control element as movement from normal increases.

29	Relay, puppet:
	This subclass is indented under subclass 26.  Devices in which at a given pressure a puppet-valve opens, allowing pressure from the boiler to operate a motor, which actuates the heat-controlling means.

30	Bourdon type:
	This subclass is indented under subclass 26.  Devices in which the pressure-responsive element which operates the controlling means is a Bourdon tube.

31	Float:
	This subclass is indented under subclass 26.  Devices in which the pressure acts on a body of liquid, thereby varying the level thereof, and a float or piston rising and falling with the change in level of the liquid operates the controlling means. Also includes devices where a float is raised more or less by change in pressure of steam thereunder when water boils. SEE OR SEARCH THIS CLASS, SUBCLASS: 100, for other float responsive devices.

32	Expanding fluid:
	This subclass is indented under subclass 20.  Devices controlling the heating means directly by a thermostat of the expanding-fluid type responsive to the temperature of the fluid heated. SEE OR SEARCH THIS CLASS, SUBCLASS: 4, 42, 56+, 64, 86, 95, and 99, for the type of thermostat used and devices operated thereby. 18, for similar structure in exchange heaters.

33	Expanding solid:
	This subclass is indented under subclass 20.  Devices controlling the heating means directly by a thermostat of the expanding-solid type responsive to the temperature of the fluid heated. The thermostat may be the walls of the container. SEE OR SEARCH THIS CLASS, SUBCLASS: 5, 19, 43, 59+, 66, 87, 96, and 101+, for the type of thermostat used and devices operated thereby.

34	COOLING RADIATOR:
	This subclass is indented under the class definition.  Devices not otherwise classified controlling the temperature of the fluid within a cooling-radiator, as the radiator in the cooling system of an internal-combustion engine. SEE OR SEARCH CLASS: 123,  Internal-Combustion Engines,   subclasses 41.02+ for specific cooling systems peculiar to internal-combustion engines.

34.5	Bypass:
	This subclass is indented under subclass 34.  Subject matter in which a by pass is interposed in the cooling circuit to by pass the radiator, usually including a thermostatically operated valve responsive to the temperature of the coolant or engine and positioned in the circuit to direct the flow of the coolant either to the radiator or the by pass.

35	Air control:
	This subclass is indented under subclass 34.  Devices controlling the flow of air over the radiator according to the temperature of the fluid cooled or the cooling-air or the engine temperature. SEE OR SEARCH CLASS: 123,  Internal-Combustion Engines,   subclasses 41.04+ and 41.11+ for shutter and impeller controls associated with engine cooling. 165,  Heat Exchange,   subclass 98 for radiator with means controlling the flow of air therethrough not automatically controlled, and subclasses 281+; 287+ for a heat exchanger having automatic temperature or pressure control.

35.2	Shutters:
	This subclass is indented under subclass 35.  Subject matter in which the means for controlling the air flow is shutters.

35.3	Servomotor:
	This subclass is indented under subclass 35.  Subject matter in which the means for operating the shutters includes a servo-motor.

36	HEATING RADIATOR:
	This subclass is indented under the class definition.  Devices not otherwise classified controlling the supply of heating fluid to a heating-radiator.

37	Combined radiator and apartment controlled:
	This subclass is indented under subclass 36.  Devices responsive to conditions in the radiator and temperature of the apartment heated thereby. SEE OR SEARCH THIS CLASS, SUBCLASS: 9, for systems in which the temperature of a heater and of the apartment controls the regulation. 91, for controls responsive to temperatures at different places.

38	Air control:
	This subclass is indented under subclass 36.  Means regulating the flow of air over the radiator according to temperature changes in the radiator, the air heated, or the apartment to be heated. SEE OR SEARCH THIS CLASS, SUBCLASS: 13, for similar structure in fluid mixers.

39	Aspirator:
	This subclass is indented under subclass 36.  Heating-radiators with means for exhausting the air therefrom in which the heating effect of the radiator is controlled by a fluid-motor operated by said exhaust, the connection between the exhaust and the motor being controlled by a thermostat. SEE OR SEARCH THIS CLASS, SUBCLASS: 54, for steam traps incorporating a pressure motor and a thermostatic pilot therefor.

40	Thermostatic:
	This subclass is indented under subclass 36.  Heating-radiators provided with a thermostat subjected to the exhaust from the radiator and controlling the supply of heating fluid to the radiator.

41	With trap:
	This subclass is indented under subclass 40.  Subject matter in combination with an automatic trap for discharging the air and water of condensation. SEE OR SEARCH THIS CLASS, SUBCLASS: 53, through 60, under "Traps", for the specific automatic trap construction. 53+, for steam traps with float valve and thermostatically controlled air vent valve.

42	Expanding fluid:
	This subclass is indented under subclass 36.  Heating-radiators with a thermostat of the expanding-fluid type for directly regulating the supply of heating fluid to the radiator. SEE OR SEARCH THIS CLASS, SUBCLASS: 4, 18, 32, 56+, 64, 86, and 99, for the type of thermostat used and controlling devices operated thereby. 40+, for similar devices exhaust operated.

43	Expanding solid:
	This subclass is indented under subclass 36.  Heating-radiators with a thermostat of the expanding solid type for directly regulating the supply of heating fluid to the radiator. (1) Note. This also includes devices operated by the expansion of the radiator. SEE OR SEARCH THIS CLASS, SUBCLASS: 5, 19, 33, 59+, 66, 87, 96, and 101+, for the type of thermostat and controlling devices operated thereby.

44	HUMIDITY CONTROL:
	This subclass is indented under the class definition.  Devices controlling the humidity of a room or apartment by means of a device responsive to the relative humidity therein. SEE OR SEARCH CLASS: 165,  Heat Exchange,   subclasses 282 ; 283; 294; 296; and 297 for a heating and cooling system having humidity control. 261,  Gas and Liquid Contact Apparatus,   subclasses 129+ for temperature or humidity controlled gas liquid contactors having heating or cooling means.

45	DRAFT-OPERATED:
	This subclass is indented under the class definition.  Devices controlling the operation of a heater according to the draft. SEE OR SEARCH CLASS: 137,  Fluid Handling,   subclasses 98+ , 458 to 460, 486+, 496, and 497+ for valves responsive to change in rate of flow.

46	WITH TIMING ELEMENT:
	This subclass is indented under the class definition.  Devices in which a clock is employed for adjusting the regulating device at a given time or where the clock cuts in or cuts out the regulating device; also devices with timing means for periodically placing the regulating means into and out of operation. SEE OR SEARCH CLASS: 110,  Furnaces,   subclass 192 for a refuse incinerator or solid fuel furnace provided with a timer control.

47	HIGH AND LOW TEMPERATURE ALTERNATE:
	This subclass is indented under the class definition.  Devices controlling the temperature by two different devices alternately, one set to maintain the temperature relatively high and the other relatively low. SEE OR SEARCH THIS CLASS, SUBCLASS: 46, for clock controlled regulators that may be operated to maintain different temperatures at different times.

48	SNAP-ACTING:
	This subclass is indented under the class definition.  Devices in which the temperature control valve does not move on slight changes in temperature, but its operating force is stored up during a certain movement of the temperature responsive device, and then the valve (or controlling means) suddenly moves throughout its entire movement not provided for more specifically below. SEE OR SEARCH THIS CLASS, SUBCLASS: 81, 83, for such devices incorporating a fluid motor which is relay operated. SEE OR SEARCH CLASS: 74,  Machine Element or Mechanism,   subclasses 100.1+ for snap action devices associated with mechanism for converting reciprocating motion to or from oscillating motion.