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Historic Renovation P2-Paul Pollets

Paul Pollets
Paul Pollets Member Posts: 3,661
Last month we removed a 95yo cast iron gravity monster and just finished the retrofit with a Viessman RN280 staged boiler and 92g VitoCell indirect DHW. This restored home was the Japanese Consulate prior to WWII. This will probably be the last of the RN2 series we'll install, as Vitogas GS series has replaced the RN line. I'll miss the integral positive seal vent damper that holds all the heat within the casting.
The cast iron ornate American roccoco radiators have been retrofited with Oventrop angle valves and TRV heads in Charcoal color. The nickle plating on the valves was removed by sandblasting and rough polished to keep the "look". The valves are actually metric and were fitted on the American pipe threads using "Rorke's Rule". You have to know Chris Rorke to learn how to do it. I was skeptical, but can attest to the method.
The piping details the 3 multi temp zones used to heat the residence. High temp zone for (3)toe kick convectors, Mixed zone using a 4 way modulated valve for the cast iron rads, and a subzone off the 4way for a staple-up application under 3 rooms. Yes, we use transfer plates.
The piping detail is straight out of the Viessmann schematics. We also use Danfoss or Ovcntrop pressure bypass differential bypass on each pump.

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