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Veissmann boiler questions
First post here - bought a house in Central NH that came with a late 90's Veissmann setup. SR-VR control unit and VBC-18 boiler. Been cold enough lately to expose just how poorly set up this thing is - I know it's supposed to be an amazing system, but we can't ever get it even close to what we're setting the thermostat temp at. Set it for 72 and you're lucky if the room gets up to 64. I cleaned the boiler and replaced a noisy blower in the fall, pretty sure the furnace is working properly, just that we're missing something in the settings. 2 story house with forced hot water registers circa 1950. Outdoor sensor is installed and passed the resistance test in the service manual. All registers have been bled and TACO valves are tested and working properly.
Here are my questions so far -
Using a brand new Honeywell "round" thermostat. What should we set as far as cycles per hour?
Should we be wired into the R&W wires?
What should we aim for as far as resting pressure? I've tried moving it around 10-20PSI and don't seem to see a change in how the system performs.
Max water temp is set to 75 C, should we mess with this?
The curve continues to mystify us. We've tried cranking it up to max, leaving it at default, moving it around, and just can't get a satisfactory result.
Been through all the available literature and still stumped.
We've already gone through almost 3/4 a tank of oil and have yet to really feel warm in this house. Hoping someone can shed some light on this!