Abstract: A spring clamp marker assembly is composed of interconnecting spring clamp hose markers that provide a positive and easily changeable means for marking hoses used to maintain HVAC equipment and for any other suitable application. The interconnecting spring clamp hose markers may also be used with power cables or other linear items with a generally circular cross section.

Abstract: A vacuum pump system includes an air-cooled, O-ring sealed vacuum pump and an oil management system with an LED illuminated clear tank for observation of the oil condition as well as a large oil inlet and outlet for rapid and safe oil changes while the pump is operating. The oil management system is also configured to prevent oil from the sump from being drawn into an evacuated AC/R system when the pump is stopped and the intake ports are not sealed from the high vacuum AC/R system. The oil management system includes a preferential vacuum relief system that allows air instead of the oil from the sump to be drawn back into the evacuated lines.

Abstract: A dual-valve, valve core installation/removal tee enable the removal and or replacement of a Schrader® valve insert without evacuating the refrigeration system. The use of a dual-valve valve core installation/removal tee also permits the valve core to be removed and maintenance of the HVAC system to be performed without the flow restriction of the valve core and core depressor.

Abstract: A combustion analyzer system includes an analyzer unit, a primary analysis probe and one or more remote probes. The analyzer unit includes a condensation removal unit and two or more electrochemical sensors to detect at least oxygen and carbon monoxide. The analyzer unit or the primary analysis probe include a means for condensing and eliminating liquid in the combustion gas to be analyzed.

Abstract: A vacuum pump system includes an air-cooled, O-ring sealed vacuum pump and an oil management system with an LED illuminated clear tank for observation of the oil condition as well as a large oil inlet and outlet for rapid and safe oil changes while the pump is operating. The oil management system is also configured to prevent oil from the sump from being drawn into an evacuated AC/R system when the pump is stopped and the intake ports are not sealed from the high vacuum AC/R system. The oil management system includes a preferential vacuum relief system that allows air instead of the oil from the sump to be drawn back into the evacuated lines.

Abstract: A combustion analyzer system includes an analyzer unit, a primary analysis probe and one or more remote probes. The analyzer unit includes a condensation removal unit and two or more electrochemical sensors to detect at least oxygen and carbon monoxide. The analyzer unit or the primary analysis probe include a means for condensing and eliminating liquid in the combustion gas to be analyzed.

Abstract: The devices and methods described below provide for an insert molded core depressor in which the core depressor blade is molded into a neoprene gasket. This configuration ensures that the core depressor blade does not separate from the neoprene gasket and provides a significantly improved channel for the conduction of refrigerant through the core depressor and valve.

Abstract: A combustion analyzer system includes an analyzer unit, a primary analysis probe and one or more remote probes. The analyzer unit includes a condensation removal unit and two or more electrochemical sensors to detect at least oxygen and carbon monoxide. The analyzer unit also includes a means for sealing or isolating the electrochemical sensor inputs to prevent oxidation of the reactive elements when the unit is not in use.

Abstract: A vacuum pump system includes an air-cooled, O-ring sealed vacuum pump and an oil management system with an LED illuminated clear tank for observation of the oil condition as well as a large oil inlet and outlet for rapid and safe oil changes while the pump is operating. The oil management system is also configured to prevent oil from the sump from being drawn into an evacuated AC/R system when the pump is stopped and the intake ports are not sealed from the high vacuum AC/R system. The oil management system includes a preferential vacuum relief system that allows air instead of the oil from the sump to be drawn back into the evacuated lines.

Abstract: A refrigerant recovery system includes a direct current (DC) motor and digital display and controls enabling an automatic self-test mode to insure proper operation prior to starting to service an HVAC system and a maintenance assist mode to diagnose and suggest maintenance for optimum performance of the refrigerant recovery system.