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• Adjust the appropriate DIP switches according to model and vent length as shown
in the following. 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.
240HX3/340HX3
Bank of
DIP switches
Set DIP switches shown in the table below depending on the vent diameter, the installation, and the vent length.
Vent diameter & Installation
Two-pipe, Direct vent
3ʺ venting*
Single vent
Two-pipe, Direct vent &
4ʺ venting
Single vent
240HX3/340HX3
Indoor
540HX3 Indoor
(Upper bank of
DIP switches)
*PVC concentric termination (100112163) installation is applied to the DIP switch settings of 3" venting. (Refer
to page 10.)
3" straight pipe
Intake vent collar with
3" adapter* (Female)
• PVC adapter will accept 3" straight pipe.
5 to 20 ft (1.5 to 6.1 m)
(DEFAULT)
5 to 45 ft (1.5 to 13.7 m)
(DEFAULT)
5 to 50 ft (1.5 to 15.2 m)
(DEFAULT)
ON 1 2 3 4 5 6 7 8 9 10
OFF
No. 6 : O N
No. 7 : OFF
ON 1 2 3 4 5 6 7 8
OFF
No. 3 : O N
No. 4 : OFF
3" vent connection for PVC/CPVC venting only
3" straight pipe
Exhaust vent collar
with 3" adapter*
(Female)
23
Upper bank of
DIP switches
Lower bank of
DIP switches
Vent length
21 to 40 ft (6.2 to 12.2 m)
46 to 70 ft (13.8 to 21.3 m)
51 to 100 ft (15.3 to 30.5 m)
ON 1 2 3 4 5 6 7 8 9 10
OFF
No. 6 : OFF
No. 7 : OFF
ON 1 2 3 4 5 6 7 8
OFF
No. 3 : OFF
No. 4 : OFF
3" street elbow
with bird screen
Intake vent collar
with 3" adapter
(Female)
1. Connect spigot end of 3" street elbow into the
intake vent collar with 3" adapter. Be sure to
insert bird screen into the hub side.
2. Connect 3" straight pipe into the exhaust vent
collar with 3" adapter.
Page
Installation Manual
Installation
540HX3
41 to 70 ft (12.3 to 21.3 m)
ON 1 2 3 4 5 6 7 8 9 10
OFF
No. 6 : O N
No. 7 : O N
ON 1 2 3 4 5 6 7 8
OFF
No. 3 : O N
No. 4 : O N
3" straight pipe
Exhaust vent collar with
3" adapter (Female)
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