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,t <br /> Direct <br /> A direct refrigeration system, the <br /> g Y <br /> type we have, circulates the primary . <br /> refrigerant (R-22) directly through <br /> the ice rink floor and refrigeration <br /> system, heat is removed from the <br /> floor by the refrigerant, therefore <br /> no secondary refrigerant or heat <br /> exchange is needed. <br />