Dipswitch Settings - A.O. Smith T-D2-OS Service Manual

12-5. Dipswitch settings

The T-D2-IN shares the computer board with the T-D2-OS. The
computer board has two bank of dipswitches: "upper" and
"lower". The upper bank has certain special functions as shown on
the following table and generally should not need adjustment.
Carefully verify the functions of each dipswitch before changing
any settings.
The functions of the upper bank of dipswitches
No. Functions
1 Gas type
2
3 Allow adjustments of fan motor speed
(Changing the FM speed is similar to changing the
manifold pressure. See section 12-13)
4 FM+, FM++ and FM+++
5 (FM speed is increased automatically. See section 12-10)
T-D2-IN
T-D2-OS
6 N/A
OFF position
No. 5
ON position
OFF position
No. 6
ON position
T-D2-IN / T-D2-OS Service Manual
ON position
Propane
Natural gas
Enable
No. 4
OFF position
0 %
+12 %
No. 5
OFF position
0 %
+8 %
N/A
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CONFIDENTIAL
Ver. 1.00
Upper bank of dipswitches
Lower bank of dipswitches
OFF position
Disable
Disable
Disable
(Default)
ON position
+6 %
+18 %
ON position
+4 %
+12 %
N/A
(Default)