High-Altitude Region Support Functions - A.O. Smith T-H3J-DV Service Manual

12-13. High-Altitude Region Support Functions

<Using these functions>
The high-altitude region support functions have four
operation levels, with the appropriate level being set up
by the installer until the abnormal sound problem is solved.
The desired level can be specified at the bank of DIPswitches
(No.3 , No.4 and No.5) on the computer board. See the table
below.
Indoor models of 240 (T-H3J) / 340 (T-H3S) : Propane
Level Elevation
0 0 (DEFAULT)
Up to
1
2,500 ft
Up to
2
5,000 ft
Up to
3
7,500 ft
Up to
4
10,100 ft
Special function
Indoor models of 240 (T-H3J) / 340 (T-H3S) : Natural gas
Level Elevation
0 0 (DEFAULT)
Up to
1
2,500 ft
Up to
2
5,000 ft
Up to
3
7,500 ft
Up to
4
10,100 ft
Special function
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Output Fan motor
reduction speed change
N/A N/A
N/A 3 %
-8 % 5 %
-11 % 7 %
-14 % 9 %
-18 % 12 %
-22 % 15 %
N/A -7%
Output Fan motor
reduction speed change
N/A N/A
N/A 6%
-6 % 10 %
-9 % 14 %
-12 % 18 %
-15 % 22 %
-18 % 26 %
N/A -7 %
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
Bank of DIPswitches
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