Joined on May 1, 2004
Last Post on May 31, 2004
@ May 31, 2004 8:42 AM in Possibly my largest job everI am in the middle of a job like this myself. We are using a 2 pipe reverse return system to keep system temperature consistent and controllable. We are using Danfoss thermostatic radiator valves in every room with the remote capilary to make it a wall stat (much easier than trying to get on your knees to adjust temperature). Our installation is a mix of radiant and Burnham Sunrads. We are using constant circulation when the outdoor reset reaches its setpoint. There will be Danfoss pressure differential valves at the pumps so if nothing is calling for heat the pumps will not dead head and fail prematurely. We are using two boilers with Tekmar controls for lead-lag and outdoor reset.
@ May 31, 2004 8:28 AM in hot water zone off steam boiler 4/3/2000If you are pulling the water directly out of the boiler you should have a pump with a bronze impeller. The non-ferrous impellers do not hold up to the heat. The better idea is to use a coil of some sort- your preference. If you have a coil your water temperatures are typically lower so there is no need for a more expensive pump and the hydronic part of the system will stay cleaner. You will need a feed valve, expansion tank etc... if the coil is being used on a closed system.
@ May 31, 2004 8:19 AM in Slant fin Hydronic Explorer questionYou should be entering the average exposed area on a basement if you are not doing so. If you have a 7' basement and only 2' is above grade you should be entering the ceiling height as 2'. If you have a sloping property line you should use the average height that is above grade.
@ May 23, 2004 10:07 AM in peerless and dunkirk 90% boilersThe best I have seen is the Weil McLain Ultra. The Peerless is actually a Munchkin if I am correct. I am not familiar with the Dunkirk.