Manifold Actuators

Alan (California Radiant) Forbes

I picked up a job that needs some replacement Wirsbo (now Uponor) manifold actuators. There are two Wirsbo manifolds with different actuators. It would help me to identify the actuators part number.



Many thanks.

Ironman

Actuators

I don't have the part numbers, but the ones on the left are the older wirsbo/Honeywell style. You can use the Rehau style on the right to replace the older style though the older ones are still available from Honeywell. If the Rehau are used, they must be mounted upright on these manifolds. They are much more reliable.



The old style are micro motor; the new are a heated wax element.

Plumdog_2

It can be maddening!

Honeywell still sells those motorized telestats, but the screw-on collars don't match up with the old Wirsbo manifolds. I tried to swap the collars but I can;t get them off without ruining the little locking ring and stuff. The Uponor 301A (I think) with the correct adaptors will work, but I wish they would produce those motorized ones with the right collars again. I don't like waiting for that slow-motion button to rise! The time required to go through a job with 30 or 40 of those wax eggs and check the end switches is ridiculous!

hot_rod

Possibly

The Caleffi TwistTop would fit. I'd be glad to send you one. Its a actuator that can be manually opened, also. It "makes" the end switch and returns closed when powered if you forget to.



The threads are usually common, the difference will be the pin stroke and length. It could be the replacement actuator holds the valve open a bit, or doesn't allow it to fully close if the pin is different.



That gear style Wirsbo was a Sparco design I believe, taken over by Honeywell. You might find some old Sparco inventory out there.

Alan (California Radiant) Forbes

Thanks, guys!

I spoke to Matt at Uponor and he gave me a replacement part number A3010522 to replace either actuator.



I'll purchase more than the owner needs and keep a few in stock at his house for future failures.