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Bleeding Hydronic Baseboard heating system

Asked Nov 22, 2008, 10:25 AM — 2 Answers
I have just moved into an old house in New Jersey and the house has two separate heating zones: one thermostat upstairs and one thermostat downstairs. The upstairs thermostat is currently inoperative, so a PSE&G technician circumvented the problem, and now both upstairs and downstairs are being regulated by the downstairs thermostat. The problem is there is no heat getting to the upstairs baseboard fin-heaters; the PSE&G tech said there is probably air in the line, and so bleeding is required. I tried to bleed the line as he had suggested but after I open the 30psi valve release, the hose I connected to the upstairs return-line drain faucet is NOT where the water comes out, but instead the water is being discharged out the 'emergency' valve which has no threaded line for a hose connection; and anyway I think the water is not being 'pushed' upstairs and back down the upstairs drain, but just to the emergency valve. Could someone help me, we're freezing upstairs?

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hvac1000's Avatar
hvac1000 Posts: 14,546, Reputation: 2381
Heating & Air Conditioning Expert
  
#2

Nov 22, 2008, 11:29 AM


I believe from what you have posted this system could be a problem. Before things get out of hand I suggest you call a professional for ON SITE service. The water should not be coming out of the emergency POP OFF valve. You have way to much pressure going to the system. Call for a on site inspection and repair.
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maguyver's Avatar
maguyver Posts: 7, Reputation: 1
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#3

Nov 22, 2008, 11:39 PM
It seems to me as if you have what you call zone valves. 2 small square boxes on the riser pipes to your boiler.
At the bottom of th silver the boxes there a little piece of metal sticking out.
The metal is attached to a spring loaded valve. Pull the metal back and hook it to a noch. You will hear the water flowing as soon you pull the clip back.
If so then that is the problem. Run the system and have a tech rewire your zone valves to the thermostat.
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