| 5.3102.9a
Evaluate existing pumps and motors | Motors will be evaluated to determine compatibility with variable frequency drives (VFD) Load profile and source equipment will be analyzed for use of VFD to provide variable water flow to load System valves will be surveyed to identify two-way and three-way valve locations Control strategy will be determined (e.g., differential pressure control, pressure control, differential temperature control, summer/winter settings) | Ensure existing motors and system are compatible with VFD operation |
| 5.3102.9b
Remove and replace motor | If removal and replacement of motor is required, the power supply will be disconnected, and the existing motor will be removed and replaced with motor suitable for VFD operation | Provide motor suitable for VFD operation |
| 5.3102.9c
Remove and replace motor starter | Power supply will be disconnected; existing starter will be replaced with VFD in accordance with manufacturer specifications | Install and connect VFD |
| 5.3102.9d
Install required sensors | Implement the following VFD control strategies: - Feedback sensors will be installed in accordance with manufacturer specifications at locations that will optimize chosen control strategy
- Feedback sensors will be wired to VFD in accordance with manufacturer specifications
| Ensure sensors are installed to optimize VFD operation |
| 5.3102.9e
Modify system to VFD control | System will be modified to best utilize VFD operation (e.g., conversion of three-way valves to two-way valves), as well as to safely operate boiler | Ensure system is compatible with VFD operation |
| 5.3102.9f
Restore power supply to VFD, and verify operation of VFD and pump | Power supply will be restored VFD will be shown to be capable of operating pump VFD will be shown to be capable of receiving sensor signals | Ensure VFD is ready for setup |
| 5.3102.9g
Initial setup of VFD | VFD parameters will be set up to accept feedback from sensors, dependent upon chosen control strategy | Maintain minimum system heating requirements with reduced electrical energy use |
| 5.3102.9h
Educate building operations staff | Building operations staff will be educated to operate VFD systems, including sensor location, control operation, and set points | Ensure continued optimized performance |
