A.O. Smith 240 T-H3J Service Manual page 68

computer board with the 540 Outdoor
(upper and lower bank) on the computer board.
540 (T-H3) models
The upper bank of DIPswitches
No. Functions
1 Gas type
2
3
4
3" ventings
4" ventings
5
6
(This switch is for a specialized purposes only)
7
(Changing the FM speed is similar to changing the
manifold pressure. See section 12-15)
8
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Vent settings
(Direct vent Indoor models only)
5 to 20 ft (DEFAULT) 21 to 40 ft
5 to 50 ft (DEFAULT) 51 to 100 ft
ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 5 6 7 8
OFF OFF
No. 3 : ON No. 3 : OFF
No. 4: OFF No. 4 : OFF
68
540 (T-H3) models
ON position
Propane
Natural gas
41 to 70 ft
N/A
ON 1 2 3 4 5 6 7 8
OFF
No. 3 : ON
No. 4 : ON
Page
CONFIDENTIAL
Ver. 1.00
computer board
OFF position
Disable
Disable
in the table below.
Outdoor models
1 2 3 4 5 6 7 8
ON
OFF
No. 3 : OFF
No. 4 : ON
(
Disable
Disable
Disable
(