  The natural representation of the quantized affine algebra of type A can be
defined via the deformed Fock space by Misra and Miwa. This relates the classes
of Weyl modules for a type A quantum group at a root of unity to the action of
the quantized affine algebra as the rank tends towards infinity. In this paper
we investigate the situation outside of type A. In classical types, we
construct embeddings of the Grothendieck group of finite dimensional modules
for the corresponding quatum group at a root of unity into Fock spaces of
different charges and define an action of an affine quantum symmetric pair that
plays the role of the quantized affine algebra. We describe how the action is
related to the linkage principal for quantum groups at a root of unity and
tensor product multiplicities.
