  Using the field theoretic renormalization group technique in the two-loop
approximation, turbulent Prandtl numbers are obtained in the general $A$ model
of passive vector advected by fully developed turbulent velocity field with
violation of spatial parity introduced via continuous parameter $\rho$ ranging
from $\rho=0$ (no violation of spatial parity) to $|\rho|=1$ (maximum violation
of spatial parity). In non-helical environments, we demonstrate that $A$ is
restricted to $-1.723 \leq A \leq 2.800$ (rounded on the last presented digit)
due to the constraints of two-loop calculations. When $\rho >0.749$
restrictions may be removed. Furthermore, three physically important cases $A
\in \{-1, 0, 1\}$ are shown to lie deep within the allowed interval of $A$ for
all values of $\rho$. For the model of linearized Navier-Stokes equations ($A =
-1$) up to date unknown helical values of turbulent Prandtl number have been
shown to equal $1$ regardless of parity violation. Furthermore, we have shown
that interaction parameter $A$ exerts strong influence on advection diffusion
processes in turbulent environments with broken spatial parity. In explicit,
depending on actual value of $A$ turbulent Prandtl number may increase or
decrease with $\rho$. By varying $A$ continuously we explain high stability of
kinematic MHD model ($A=1$) against helical effects as a result of its
closeness to $A = 0.912$ (rounded on the last presented digit) case where
helical effects are completely suppressed. Contrary, for the physically
important $A=0$ model we show that it lies deep within the interval of models
where helical effects cause the turbulent Prandtl number to decrease with
$|\rho|$. We thus identify internal structure of interactions given by
parameter $A$, and not the vector character of the admixture itself to be the
dominant factor influencing diffusion advection processes in the helical $A$
model.
