Abstract:
A method of controlling operation of a pair of two-stage air conditioners. The method monitors a temperature of an area served by the air conditioners; activates a first stage of a first or lead air conditioner when the temperature rises above a first set point temperature; activates a first stage of a second or lag air conditioner when the temperature rises above a second set point temperature; activates a second stage of the first air conditioner only if the temperature remains above the second set point temperature beyond a first selected time period; and activates a second stage of the second air conditioner only if the temperature remains above the second set point temperature beyond a second selected time period. Neither of the air conditioners is operated in their less efficient second stages if both air conditioners are not first operating in their high efficiency first stages so that the entire cooling requirements of the area served by the air conditioners is primarily served by the first high efficiency stage of one or both the air conditioners.
Abstract:
An air conditioning system for cooling an enclosure includes an air conditioner and a control system for triggering an economizer cycle of the air conditioner. The control system determines an electrical load of equipment in the enclosure, calculates a maximum acceptable outdoor temperature at which the economizer cycle may be operated based at least partially on the electrical load, receives data representative of an actual outdoor temperature, and initiates the economizer cycle if the actual outdoor temperature is equal to or below the maximum acceptable outdoor temperature.
Abstract:
An air conditioning system for cooling an enclosure includes an air conditioner and a control system for triggering an economizer cycle of the air conditioner. The control system determines an electrical load of equipment in the enclosure, calculates a maximum acceptable outdoor temperature at which the economizer cycle may be operated based at least partially on the electrical load, receives data representative of an actual outdoor temperature, and initiates the economizer cycle if the actual outdoor temperature is equal to or below the maximum acceptable outdoor temperature.
Abstract:
Retractable stairs for mounting in an exterior doorway of a recreational vehicle are provided with a spaced apart stringers and a tread extending between the stringers. Spaced apart straps are connected to upper ends of the stringers and are pivotally mounted to a floor in an interior space of the recreational vehicle to allow movement of the stringers and the tread through the exterior doorway between a retracted position stowed within the recreational vehicle and a deployed position outside of the recreational vehicle. A threshold plate is positioned between the straps and is fixed against movement during the pivoting movement of the straps. Locking latches extend outwardly from the stringers and are positionable for engaging a jamb of the exterior doorway for releasably securing the stringers and the tread in the retracted position. Extensible support legs are mounted on the stringers and extendable downwardly below the stringers to engage a ground surface for supporting the retractable stairs. The extensible support legs are operable to extend downwardly in ratcheting increments of 0.5 inches or less by movement of a ratcheting latch.
Abstract:
A retractable awning is provided for a slide-out room on a recreational vehicle. The retractable awning includes a roller that has opposite ends supported by a head assembly. A slide bracket assembly is associated with each head assembly and includes a plate mounted on the slide-out room and a mounting arm that extends from the head assembly and may be slidably joined with the plate using a tenon and slot interconnection.
Abstract:
An apparatus and method for controlling the maximum stroke of a linear compressor is provided. The shorting of the normal supply voltage of a compressor to ground is used to detect overstroking. A plurality of transistors are electrically coupled to the control circuit that is electrically coupled to a linear compressor. When the compressor's stroke exceeds it maximum stroke marked by the refrigerant barrel of the compressor making physical contact with the armature, a signal is received by the control circuit. The control circuit processes this signal and sequences the transistors to return the extended stroke of the compressor to its maximum stroke.
Abstract:
A single package, wall mount air conditioner including a cabinet, an evaporator coil assembly, a condenser coil assembly, and a theft deterrent system. The theft deterrent system including metal straps securing the coil assemblies to the cabinet and impeding their removal from the cabinet. The straps having boxed cross-sections and being attached by specialty fasteners requiring a non-standard tool to remove, wherein the heads of the fasteners are shielded to only permit the axial access required by the tool. The theft deterrent system further including a sensor configured to monitor a condition of the air conditioner, wherein the condition is indicative of an attempt to remove the coil assemblies from the cabinet, and to communicate an alarm signal through a speaker or to a remote monitoring station if the condition occurs. The sensor may include one or more of a plunger-type switch, a vibration sensor, or a refrigerant monitoring sensor.
Abstract:
A lock-out circuit for preventing over-heating of a recreational vehicle heating system includes a temperature limit switch and a lock-out relay. The temperature limit switch is electrically coupled with the heating system and is operable to open when its temperature exceeds a threshold temperature and to reset and close when its temperature drops below the threshold temperature range. The lock-out relay has a contact electrically coupled with the temperature limit switch and a high impedance relay coil electrically coupled with the heating system in parallel with the temperature limit switch. The temperature limit switch and the lock-out relay remove substantially all power to the heating system when the temperature limit switch opens and re-establish power to the heating system only after the temperature limit switch has reset and voltage is at least temporarily removed from the lock-out relay.
Abstract:
A retractable awning is provided with a canopy that is windable around a roller supported at its opposite ends by support arm assemblies that include an adjustable pitch arm linkage that is extendable in length to move the roller in a direction away from a ground surface and retractable in length to move the roller in a direction toward a ground surface. A lever that controls the locking of the adjustable pitch arm linkage at the desired length may be automatically locked during retraction of the adjustable awning from the deployed configuration to a folded storage configuration.