User Guide

12 Page
HIGH-ALTITUDE INSTALLATIONS
WARNING
• Adjust the appropriate DIP switches according to model and elevation as
shown below. DO NOT adjust the other DIP switches.
• Turn off the power supply to the water heater before changing the DIP
switch settings.
• Failure to observe these warnings could lead to carbon monoxide poisoning
or death.
Check the elevation where your water heater is installed. Set DIP switches shown in the table below
depending on the altitude.
Installaon
Installaon Manual
NOTE: The dark squares indicate the correct DIP switch positions.
540 model computer board
Lower bank of DIP switches
Bank of DIP switches
240 and 340 models computer board
Indoor models
0 to 2,000 ft
(0 to 610 m)
(DEFAULT)
2,000 to
3,000 ft
(611 to 914 m)
3,000 to
5,000 ft
(915 to 1,524 m)
5,000 to
7,500 ft
(1,525 to 2,286 m
7,500 to
10,100 ft
(2,287 to 3,078 m)
240 and 340 models
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : OFF
No. 4 : OFF
No. 5 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : OFF
No. 4 : ON
No. 5 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : OFF
No. 4 : OFF
No. 5 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : OFF
No. 4 : ON
No. 5 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : ON
No. 4 : ON
No. 5 : ON
540 model
(Lower bank of
DIP switches)
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : OFF
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : ON
No. 4 : OFF
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : ON
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : ON
No. 4 : ON
OFF
ON
1 2 3 4 5 6
No. 2 : ON
No. 3 : ON
No. 4 : ON
Altitude
DIP switches
Installation altitude
The maximum certified
or allowable installed
altitude is 10,100 ft
(3,078 m) for indoor
models and 6,000 ft
(1,829 m) for outdoor
models.
Outdoor models
0 to 2,000 ft
(0 to 610 m)
(DEFAULT)
2,000 to
4,000 ft
(611 to 1,219 m)
4,000 to
6,000 ft
(1,220 to 1,829 m)
240 and
340 models
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : OFF
No. 4 : OFF
No. 5 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : OFF
No. 4 : OFF
No. 5 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 3 : ON
No. 4 : OFF
No. 5 : ON
540 model
(Lower bank of
DIP switches)
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : OFF
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : ON
OFF
ON
1 2 3 4 5 6
No. 2 : ON
No. 3 : OFF
No. 4 : ON
Altitude
DIP switches