2 zone system-no heat upstairs-Boiler doesn't fire when that zone asks for heat
Glad I found this forum. Perhaps someone can assist me.
2 zone system. Gas fired-forced hot water (not baseboards but air handlers-one in basement and one of 2nd floor)
3 circ pumps-and a taco controller. zone 1 works, the hot water system works-all 3 circ pumps turn on.
Zone 1-everthing works fine
Hot water heater works fine
Zone 2-turn on heat, set hallway thermostat on 90F, pump circ starts, air handler upstairs starts and blows (cold) but the boiler never starts up.
I thought it may be air in the system so turned th the valves in the 2nd floor airhandler to release any air, but no air came out-
The zone 2 thermostat when turned to heat kicks on the blower in the 2nd floor-can anyone tell me how does the air handler tell the boiler to start? Could that be my issue?
Zone 1 kicks in the Burnham boiler
Zone 2 does NOT start the boiler.
I swapped zone 1 with zone 2 relays in the taco but that didnt work?
Last year I had what I thought was the same issue-no heat upstairs-I called a random plumber. He and his partner came-(I didn't watch) said the released the air from the system. Heat worked when they left. This year, same issue-I found the valves-turned them-uneventful. No air hissing.
pic of 2nd floor air handler
Here's a few more, I hope they're helpful.
the 2nd floor (You may notice the TACO says 3rd floor heat-that's what I call the 2nd floor)
Anyway, the 2nd floor air handler is horizontal, above my wifes closet. this pic shows the unit.
the valves: two are on the bottom, two on top. When loosened, the top don't have air, or water that comes out. This pic shows the two on top. Sorry for the sideways pic. Taken with a blackberry
The two on the bottom, one spits, one, occaisionally spits some water, but only after running the system a bit..