CHP + Absorption Chiller

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I completed a model using the following element (and all the related objects):

1. One AirTerminal:SingleDuct:VAV:HeatandCool:Reheat
2. Boiler:HotWater
3. Chiller:Electric:EIR
4. CoolingTower:TwoSpeed
5. WaterHeater:Mixed

The model run correctly and this is the basic case, now I want to implement a model that use a Internal Combustion Engine and an Absorption Chiller to cover the basic load. I will resize the Boiler and the Chiller to cover the peak load.

I completed the model with CHP and Absorption Chiller but I have a problem: the CHP always work at 100% and if I size it in a way that it cannot work at 100% for all the time the simulation fail (error on maximum temperature over the limit in the hot water loop).

Any idea on what I can do to fix this problem?

Thank you!

Andrea