High-Altitude Installations - American Water Heater 240HX3 Installation Manual And Owner's Manual

• 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.
WARNING
• Failure to observe these warnings could lead to carbon monoxide poisoning or
death.
Indoor models
Altitude
DIP switches
ON
OFF
240HX3/340HX3
ON 1 2 3 4 5 6
540HX3
OFF
(Lower bank of
DIP switches)
Outdoor models
Altitude
0 to 2,000 ft
(0 to 610 m)
DIP switches
ON
OFF
240HX3/340HX3
ON 1 2 3 4 5 6
540HX3
OFF
(Lower bank of
DIP switches)
NOTE: The dark squares indicate the correct DIP switch positions.
240HX3/340HX3
Bank of DIP switches

HIGH-ALTITUDE INSTALLATIONS

0 to 2,000 ft
2,001 to
(0 to 610 m) 3,000 ft
(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 : O N
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 : O N
No. 4 : OFF No. 4 : OFF
2,001 to
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 : O N
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 : O N
3,001 to
5,000 ft
(915 to 1,524 m)
1 2 3 4 5 6 7 8 9 10
ON
OFF
No. 3 : OFF
No. 4 : OFF
No. 5 : ON
ON 1 2 3 4 5 6
OFF
No. 2 : OFF
No. 3 : OFF
No. 4 : O N
4,001 to
6,000 ft
(1,220 to 1,829 m)
1 2 3 4 5 6 7 8 9 10
ON
OFF
No. 3 : O N
No. 4 : OFF
No. 5 : O N
ON 1 2 3 4 5 6
OFF
No. 2 : O N
No. 3 : OFF
No. 4 : O N
540HX3
Lower bank of DIP switches
12
Page
Installation Manual
Installation
5,001 to 7,501 to
7,500 ft 10,100 ft
(1,525 to 2,286 m (2,287 to 3,078 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 : O N
No. 4 : O N No. 4 : O N
No. 5 : O N No. 5 : O N
ON 1 2 3 4 5 6 ON 1 2 3 4 5 6
OFF OFF
No. 2 : OFF No. 2 : O N
No. 3 : O N No. 3 : O N
No. 4 : O N No. 4 : O N
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.