High-Altitude Installations - Takagi AT-KJr3U-IN Installation Manual And Owner's Manual

Check the elevation where your water heater is installed. Set your DIP switches according to altitude as
shown below.
Indoor models
Altitude
DIP switches
ON
OFF
110U (AT-KJr3U) and
310U (AT-K5U) models
ON 1 2 3 4 5 6
510U (AT-D3U) model
OFF
(Lower bank of
DIP switches)
Outdoor models
Altitude
DIP switches
ON
OFF
110U (AT-KJr3U) and
310U (AT-K5U) models
ON 1 2 3 4 5 6
510U (AT-D3U) model
OFF
(Lower bank of
DIP switches)
NOTE: The dark squares indicate the correct DIP switch positions.
110U (AT-KJr3U-IN/OS) and 310U (AT-K5U-IN/OS)
Computer board
Bank of DIP switches

HIGH-ALTITUDE INSTALLATIONS

2,001 to
0 to 2,000 ft.
3,000 ft.
(0 to 610 m)
(611 to 914 m)
(DEFAULT)
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
ON
OFF
No. 3 : OFF No. 3 : OFF
No. 4 : OFF No. 4 : ON
No. 5 : OFF No. 5 : OFF
ON 1 2 3 4 5 6
OFF
No. 2 : OFF No. 2 : OFF
No. 3 : OFF No. 3 : ON
No. 4 : OFF No. 4 : OFF
0 to 2,000 ft. 2,001 to
(0 to 610 m) 4,000 ft.
(DEFAULT) (611 to 1,219 m)
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
ON
OFF
No. 3 : OFF No. 3 : OFF
No. 4 : OFF No. 4 : OFF
No. 5 : OFF No. 5 : ON
ON 1 2 3 4 5 6
OFF
No. 2 : OFF No. 2 : OFF
No. 3 : OFF No. 3 : OFF
No. 4 : OFF No. 4 : ON
12
3,001 to 5,001 to
5,000 ft. 7,500 ft.
(915 to 1,524 m) (1,525 to 2,286 m)
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
ON ON
OFF OFF
No. 3 : OFF No. 3 : OFF
No. 4 : OFF No. 4 : ON
No. 5 : ON No. 5 : ON
ON 1 2 3 4 5 6 ON 1 2 3 4 5 6
OFF OFF
No. 2 : OFF No. 2 : OFF
No. 3 : OFF No. 3 : ON
No. 4 : ON No. 4 : ON
4,001 to
6,000 ft.
Installation altitude
(1,220 to 1,829 m)
The maximum certified or
1 2 3 4 5 6 7 8 9 10
ON
allowable installed altitude
OFF
is 10,100 ft. (3,078 m) for
No. 3 : ON
No. 4 : OFF
indoor models and 6,000
No. 5 : ON
ft. (1,829 m) for outdoor
ON 1 2 3 4 5 6
models.
OFF
No. 2 : ON
No. 3 : OFF
No. 4 : ON
510U (AT-D3U-IN/OS)
Computer board
Lower bank of DIP switches
Page
Installation Manual
Installation
7,501 to
10,100 ft.
(2,287 to 3,078 m)
1 2 3 4 5 6 7 8 9 10
ON
OFF
No. 3 : ON
No. 4 : ON
No. 5 : ON
ON 1 2 3 4 5 6
OFF
No. 2 : ON
No. 3 : ON
No. 4 : ON