Siemens Industry, Inc.

Robert Hafernik

Tyrell Craig Vaughn

Laurie Watts

Robert W Martin

There is described a system and method of a building management system for preventive maintenance of an HVAC unit. Runtime data of the HVAC unit is received at a control system remote from the HVAC unit. A service message is initiated, by the control system, to a service device associated with the HVAC unit in response to determining that a preventive maintenance visit is warranted based on the runtime data. A hot-cold test for the HVAC unit is activated by the control system in response to receiving the registration message of the preventive maintenance visit from the service device. A validation message is reported in response to validating the preventive maintenance visit based on a result of the hot-cold test for the HVAC unit.

System for preventive maintenance of HVAC units

Credentialing systems, methods, and mediums. A method includes receiving, by a credentialing system, an access code and a device location from a mobile device. The device location indicates the current geographic location of the mobile device. The method includes comparing the received access code to a stored site code. The method includes, when the received access code matches a stored site code, determining whether the device location corresponds to a site location of a target system associated with the site code, and determining whether the access code is received during a valid access period associated with the site code. The method includes, when the received access code matches the stored site code, the device location corresponds to the site location, and the access code is received during the valid access period, then granting access for the mobile device to the target system.

System and method for location-based credentialing

Systems, methods, and medium remotely monitor and control heating, ventilation and air-conditioning (HVAC) units. The method includes receiving by a processor via a communication network supply temperature data indicating a supply air temperature in a duct coupled to an HVAC unit. The method includes receiving by the processor via the communication network zone temperature data of a space being maintained by the HVAC unit. The method includes receiving by the processor via the communication network thermostat data from a thermostat in the space and analyzing by the processor at least one of the supply temperature data, the zone temperature data and thermostat data. The method includes generating by the processor a control signal responsive to the analysis and transmitting via the communication network the control signal to an HVAC controller, wherein the control signal causes the HVAC controller to control the HVAC unit.

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Austin, TX, United States of America

Robert Hafernik