The ARITH_TYPE parameter determines how PV and the compensation terms (t) are combined. The user can select from nine commonly used math functions, which are depicted below. COMP_HI and COMP_LO are compensation limits.
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Flow compensation linear
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Flow compensation square root
If there is a divide by zero and the numerator is positive, f is set to COMP_HI; if the numerator is negative, then f is set to COMP_LO. The square root of a negative value will equal the negative of the square root of the absolute value. Imaginary roots are not supported.
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Flow compensation approximate
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Btu flow
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Traditional multiply and divide
If there is a divide by zero and numerator is positive, f will be limited to COMP_HI; if the numerator is negative, f will be limited to COMP_LO.
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Average
Compensation inputs that are not usable are not included in the calculation. PV is always included.
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Summer
Compensation inputs that are not configured are not used in the calculation. PV is always used.
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Fourth order polynomial
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Simple HTG compensate level
If there is a divide by zero and the numerator is positive, func will be limited to COMP_HI; if the numerator is negative, func will be limited to COMP_LO.
