Question-and-Answer Resource for the Building Energy Modeling Community
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all other capacity and EIR curves were set to coef 1 = 1, Coefs 2-6 = 0.
That's inappropriate. For EIRFPLR, if you want to get a constant COP regardless of part load ratio, set Coef 1 = 0, Coef 2 = 1, Coefs 3-4 = 0.
Setting Coef 1 = 1, Coefs 2-4 = 0 would result in the COP proportional to PLR as shown below. You have low PLR (< 3000W/8320W = 0.36). The COP decreases accordingly.
That's the biggest factor, but you can also double-check your Coefs of HeatEIRFT (i.e., Coef 1 = 1.208, Coef 4 = -0.03344). I couldn't reproduce COP ranging 1.2 to 3.5 with your setting. You can refer to this paper to correctly calculate curve coefficients.
