I have a mid 80's Bryant furnace that has the three wire pilot. Gas valve model 646AX-1. When heat is called for the induction blower runs, I prove air pressure but the pilot gas does not turn on.
Sep 27, 2009 - Find the user manual you need for your home appliance products and more at ManualsOnline. Manual for Bryant Plus 90 - 398AAW. Air inducer assembly was leaking and shorted out the main board. Replaced inducer housing, main board and. This shows the sequence of operation of the Carrier 58SSB, 58SX, 58GP Bryant, Day night, Payne 394 GAW.
I don't hear the pilot gas valve pop. Sometimes when the furnace has not been used (cold), I will get a normal sequence and hear the pilot gas valve pop. When the pilot lights everything else functions normally. I need to know how to test gas valve or what else could be causeing this. Any help is greatly appreciated!!
I get full, uninterrupted low voltage (24v) at terminal 4 on gas valve coming from the brown wire. There is a yellow wire on terminal 4 which heads to the pilot assembly. In line there is a fusible link. The fusible link is not blown, but it may have a bad connection. Yale fork lift owners manual. Yellow wire continues to pilot assembly. A green wire returns from pilot assembly to gas valve at terminal 5 to open pilot gas.
Bryant Plus 90 398aaw Manual
I get intermittent voltage at terminal 5 (pilot gas valve) and subsequently at spark box. There is a loose connection, or the pilot assembly is bad. I am testing continuity today after work. Does anyone know the temp rating for the fusible link? That link is very old, should it be replaced?