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22 ECL-PTU-207 Preloaded Applications

nviShedding (nviFP21)

This input is used to receive shedding information from a supervisory node.

Two types of shedding are available for the HVAC equipment.

The first type is a direct shedding of the electric heater. The electric heater is rescaled between 0%

and (100% - nviShedding). For example, if nviShedding = 40% and the electric heater demand is 65%,

the electric heater will be set to 39% (65% * (100% - 40%)).

The second type of shedding is an offset of the occupied/unoccupied setpoints. The shedding will au-

tomatically calculate an offset based on the difference between the occupied and standby setpoints to

apply to the effective setpoint.

For example, in Occupied mode:

£ EffectCoolSp = ((StbyCoolSp – OccCoolSp) * nviShedding/100) + OccCoolSp

£ EffectCoolSp = (( 26°C - 24°C) 30% / 100) + 24°C = 24.6°C

£ EffectHeatSp = ((StbyHeatSp – OccHeatSp) * nviShedding/100) + OccHeatSp

£ EffectHeatSp = (( 18°C - 20°C) 30% / 100) + 20°C = 19.4°C

For example, in Standby mode:

£ EffectCoolSp = ((StbyCoolSp – OccCoolSp) * nviShedding/100) + OccCoolSp

£ EffectCoolSp = (( 26°C - 24°C) 30% / 100) + 26°C = 26.6°C

£ EffectHeatSp = ((StbyHeatSp – OccHeatSp) * nviShedding/100) + OccHeatSp

£ EffectHeatSp = (( 18°C - 20°C) 30% / 100) + 18°C = 17.4°C

Shedding can be disabled using the variable nciMiscConfig/SheddingEnable (nviFP44).

To configure the system for shedding on setpoints, the variable nciMiscConfig/SheddingOnSetpoint

(nviFP44) must be set to True.

It is also possible to do shedding on lighting outputs. See the variable nviLightBlndCnfg (nviFP42) for

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