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Hi All.
I have a American Standard 90+ AUX120C960C1, made in 1999, up flow gas furnace with both outside air intake and exhaust, and blower fan at the bottom of unit. The pressure switch has 2 air hoses connected to it. One goes from the back of the switch to the bottom of the burner box area, and the hose on the front of the switch tees to the gas valve- furnace side of valve body, and the other side of the tee goes to the burner box, right under the venturis- the chamber where I can see the flame and watch the ignition process. My switch stopped working right. I found by either blowing or sucking on the various tubes I could get it to kick on again. Eventually I discovered by leaving the front tee'd tube slightly loose on the pressure switch, the furnace runs fine.
My question is: how does this double hosed pressure switch work? It seems to monitor the gas flow, and dump the measured gas into the ignition side of the burners. It also measures the suction side of the burners, closer to the exhaust area. As a safety issue, this design doesn't make sense to me, because if the hose is accidentally disconnected, it would vent gas into the house. Never mind that I partially disconnected it. It still has only one micro switch, the supply wire on one terminal, the other safety switches/sensors on the other leg, and a ground wire attached to the mounting bracket, which is connected to all furnace metal in the end.
I do not get a abnormal blinking code on control board? Should I just replace the valve? Model is Tri Delta FS6002A-1669. I cannot find one for a reasonable price, unless someone can guide me to one or a suitable substitution.
As an aside, my second furnace which is identical accept for using room air for combustion, only has one hose connected to the end of the flame path as far as I can judge. Thanks for any answers, Malcolm
I have a American Standard 90+ AUX120C960C1, made in 1999, up flow gas furnace with both outside air intake and exhaust, and blower fan at the bottom of unit. The pressure switch has 2 air hoses connected to it. One goes from the back of the switch to the bottom of the burner box area, and the hose on the front of the switch tees to the gas valve- furnace side of valve body, and the other side of the tee goes to the burner box, right under the venturis- the chamber where I can see the flame and watch the ignition process. My switch stopped working right. I found by either blowing or sucking on the various tubes I could get it to kick on again. Eventually I discovered by leaving the front tee'd tube slightly loose on the pressure switch, the furnace runs fine.
My question is: how does this double hosed pressure switch work? It seems to monitor the gas flow, and dump the measured gas into the ignition side of the burners. It also measures the suction side of the burners, closer to the exhaust area. As a safety issue, this design doesn't make sense to me, because if the hose is accidentally disconnected, it would vent gas into the house. Never mind that I partially disconnected it. It still has only one micro switch, the supply wire on one terminal, the other safety switches/sensors on the other leg, and a ground wire attached to the mounting bracket, which is connected to all furnace metal in the end.
I do not get a abnormal blinking code on control board? Should I just replace the valve? Model is Tri Delta FS6002A-1669. I cannot find one for a reasonable price, unless someone can guide me to one or a suitable substitution.
As an aside, my second furnace which is identical accept for using room air for combustion, only has one hose connected to the end of the flame path as far as I can judge. Thanks for any answers, Malcolm
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