Abstract: A handheld controller interface device that receives communications from one or more components of an HVAC system. The controller interface device is removably secured to an enclosure of the HVAC system. When not being engaged by a user, the controller user interface may be secured within the enclosure in a mounted position. When the HVAC system is being serviced, the controller user interface may be removed from the enclosure so as to be in an unmounted position. Further, when in the unmounted position, the controller interface device still at least receives communications from one or more components of the HVAC system, including, for example, a controller.

Abstract: A handheld controller interface device that receives communications from one or more components of an HVAC system. The controller interface device is removably secured to an enclosure of the HVAC system. When not being engaged by a user, the controller user interface may be secured within the enclosure in a mounted position. When the HVAC system is being serviced, the controller user interface may be removed from the enclosure so as to be in an unmounted position. Further, when in the unmounted position, the controller interface device still at least receives communications from one or more components of the HVAC system, including, for example, a controller.

Abstract: A refrigeration unit is disclosed that includes a fluid cooled power electronics package. The refrigeration unit can include a variable speed motor used to drive a compressor. The variable speed motor is driven by the fluid cooled power electronics where the fluid used to cool the electronics is working fluid from the refrigeration cycle of the refrigeration unit. A conduit is configured to route cooling fluid to the electronics. In one embodiment the electronics can be removed without the need to disassemble the conduit that carries the cooling fluid to the power electronics.

Abstract: An improved controller for vibratory seismic energy sources insures that the energy imparted to the ground by the source is in phase with the reference signal. Phase lock is achieved in a manner which minimizes the effects of the attendant frequency distortion. On upsweeps when the phase error is greater than some threshold level, phase lock is achieved by slowing down the drive signal, thereby introducing frequency distortion which falls below the bandpass of the sweep signal. On downsweeps when the phase error is above some selected threshold, phase lock is achieved by speeding up the drive signal, thereby resulting in frequency distortion which falls above the bandpass of the sweep signal.