SetPoint = 24.640 P=20.0, I=0.7 [1/h], D=2.0 [h], F=0.140+0.033*(SetP-Tout)-"GTC" (inverted sign!)
F = 0.140 + 0.033*(SetP-Tout) - "GTC" (inverted sign!) P=0.001, I=0.0 [1/h], D=0.0 [h]