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Parallel Tempering Valve Advice
My Powers LHMM434-1 tempering valve was oversized by 4 sizes and the thermal actuator seems to be shot. The factory helped me troubleshoot it and they were very helpful. The LHMM431-1 valve body doesn't work with the 434-1 check stops, so that is a bummer that requires me to remove everything. Before the Powers 434 the building had a MX128 that worked well for over 10 years. It was changed when we had a new tank installed because San Francisco hasn't allowed lead fittings for a while now. I called Honeywell and they say there are no plans to make the MX128 lead free.
I'm considering putting two Honeywell AMX102-UT-1LF's in parallel. Thoughts? Should I reverse return them or stage them?
I came up with 113 fixture units for our building using an online guide. 7 units have 2 full baths with tubs w/overhead showers. Five units have 2.5 baths with tubs w/overhead showers. All 12 units have dishwashers and laundry. 113 fixtures units is around 33-38gpm based on some stuff I found online. Using the powers web tool with the apartment/multifamily option and adding 12 laundry units I get 29gpm.
Has anyone created a manifold to favor one valve without using a differential pressure valve? I will add isolation valve, too. I suspect the AMX will be around for a while.
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