A.O. Smith 240 T-H3J Service Manual page 79

12-13. High-Altitude Region Support Functions
operation levels, with the appropriate level being set up
by the installer until the abnormal sound problem is solved.
(No.3 , No.4 and No.5) on the computer board. See the table
below.
Level Elevation
0
1
2
3
4
Level Elevation
0
1
2
3
4
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Output Fan motor
reduction speed change
Output Fan motor
reduction speed change
79
240 (T-H3J) and 340 (T-H3S) models
DIPswitch settings
No.3
OFF
OFF
ON
OFF
ON
OFF
ON
ON
DIPswitch settings
No.3
OFF
OFF
ON
OFF
ON
OFF
ON
ON
Page
CONFIDENTIAL
Ver. 1.00
Computer board
No.4 No.5
OFF OFF
ON OFF
ON OFF
OFF ON
OFF ON
ON ON
ON ON
OFF OFF
No.4 No.5
OFF OFF
ON OFF
ON OFF
OFF ON
OFF ON
ON ON
ON ON
OFF OFF