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Items included in scheduled service:

• Seasonal inspection of control systems.
• Check applicable control loops for the season.
• Investigate any overrides on the system.
• Ensure all controllers and their inputs and outputs are online.
• Backup controllers, and computer if applicable.
• Stroke Valves and Actuators.
• Investigate customer complaints or problems.

Labour and materials required to correct problems with equipment discovered during the scheduled service are not included.

Pneumatic Actuator

Damper Actuator

Valve Actuator

• Check control loops are at setpoint. Control loops not at setpoint are good indicators of potential problems. For example stuck/broken actuators, poor flows, etc.

• Controllers not online typically are caught prior to a Scheduled Service visit but may not be if they control, or monitor non-critical items.

• Overrides placed on the system by operators are indications that the automatic controls are probably not working as they should. These overrides lead to increased operating costs since the system is not allowed to compensate for changes in the control loop.

• Backups of the controllers and computers used in the system, and their batteries provide peace of mind to the building owner and operator that their investment is protected from loss of data.

• Calibration of sensors ensures that over time the drift in calibration is corrected to ensure energy savings and operator comfort for years to come.

• Stroking Valves and Actuators ensures that these items are functioning properly. This has the potential of reducing operating costs by making sure valves fully open and close and that dampers stroke fully. A heating or cooling valve that is passing by can cause the other to have to open to compensate. For example a leaky heating valve can cause the cooling valve to open to bring a fans discharge temperature back down to setpoint, resulting in a large waste of energy. Likewise stuck dampers can significantly affect the amount of energy consumed.

• Customer complaints or problems with the HVAC system can also be investigated and if possible rectified, passed on to the appropriate trade, or a solution suggested. This provides solutions for annoying little problems that do not justify a service call unto themselves but can be just as annoying as the big problems to an operator.