Elevator controls on these units (4stop hydros) do not have viscosity control. I guess that I should have included that in my original post. These units are not that old (4 years). I am not that fond of the IECA units that were installed very cheaply several years ago. They have Blain valves (junk) and holeless jacks which were installed with minimal rail supports. If you see one of these units, RUN FOR THE HILLS!!!! Don't want to say who installed most of these units, but I am "ABELL" to say that they are garbage.
