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Topic starter
26/04/2011 9:53 pm
I have a 1954 vintage Otis double pump unit. With old Esco single silonid for down only valves. Up is right off the pump thru a check valve. One of the down valves is fast the other slow. We run in slow only with both silonids energized. And I am looking for any write ups on this before we tear her open. Any help is greatly appreciated.
27/04/2011 9:43 am
Have you closed off the main adjusters to see which one is actually functioning properly. Even though both are energized, only the "level" may actually be moving the car. Manual lowering is in parallel with the solenoid to release pressure and allow a differential to create valve piston movement.
Topic starter
27/04/2011 9:30 pm
I had my guy disconnect coil leads one at a time to isolate the non functioning valve so we do know witch is witch. I just didnt want to send him in blind if I could locate a write up.
28/04/2011 11:44 am
Yeah sorry, everything I have says to retrofit with a Maxton. I will keep looking though.
28/04/2011 12:22 pm
its a easy upgrade to maxton. keep it a down leveling unit, pick both up coils off of an aux M contact. better yet install a soft starter with it and use MUS for added safety and reliability.
Topic starter
28/04/2011 7:03 pm
This unit is in a major university. And they claim the bldg is coming down. But I will gladly do a Maxton upgrade if all elce fails.