12-05-2015, 01:42 AM
Tom, for what it's worth - I found a picture on-line of the factory replacement thermocouple for the newer digital control versions of this furnace. I'm thinking it would fit the older models as well. I'm just using it for a visual reference though.
TC746X1A.jpg (Size: 20.93 KB / Downloads: 104)
I also found of copy of the "OPERATION AND REPAIR MANUAL AND PARTS LIST
SERIES 1256 & 1257"
BTFB1300-1400Manual.pdf (Size: 254.56 KB / Downloads: 1)
in which it states the following about replacing the thermocouple:
So I guess now I just have to decide on which length thermocouple I need from McMaster. 12, 18, or 24 inch. If I get one long enough to reach the PID terminal block, I shouldn't need additional thermocouple wire - should I?
TC746X1A.jpg (Size: 20.93 KB / Downloads: 104)
I also found of copy of the "OPERATION AND REPAIR MANUAL AND PARTS LIST
SERIES 1256 & 1257"
BTFB1300-1400Manual.pdf (Size: 254.56 KB / Downloads: 1)
in which it states the following about replacing the thermocouple:
Quote:19. Examine the thermocouple, and, if it is good,
reinsert it into the chamber. It should extend
about 1-1/2" into the chamber. Make sure
porcelain insulator is in place for the thermocouple
to pass through on the steel
back plate. Replace clamp and screw.
(Excessive scaling, pitting, or cracks are
some indications that the thermocouple
may need to be replaced.)
So I guess now I just have to decide on which length thermocouple I need from McMaster. 12, 18, or 24 inch. If I get one long enough to reach the PID terminal block, I shouldn't need additional thermocouple wire - should I?
Willie