Constant Load, Variable Schedule (CLVS)

CLVS includes equipment with constant load and varying hours-of-use, as depicted in Figure below. There are two bins in the load frequency distribution; however, the total number of hours in each bin is unknown.

Examples of equipment with CLVS operating characteristics include:

1. Elevators

2. Lighting under occupancy-sensor control

3. Constant-speed cooling tower fan operation (schedule varies with temperature)

4. Hot water or chilled water pumping, no VFD (schedule varies with boiler/chiller


5. Auto factory paint-shop exhaust fans

Source: BPA’s Verification by Equipment or End-Use Metering Protocol