Water Heater Installation Manual

23 Page
WARNING
• 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.
• Failure to observe these warnings could lead to carbon monoxide poisoning or death.
240HX3/340HX3
Bank of
DIP switches
540HX3
Upper bank of
DIP switches
Lower bank of
DIP switches
Installaon
Installaon Manual
Set DIP switches shown in the table below depending on the vent diameter, the installation, and the vent length.
Vent diameter & Installation Vent length

Two-pipe, Direct vent
5 to 20 ft (1.5 to 6.1 m)
(DEFAULT)
21 to 40 ft (6.2 to 12.2 m) 41 to 70 ft (12.3 to 21.3 m)
Single vent
5 to 45 ft (1.5 to 13.7 m)
(DEFAULT)
46 to 70 ft (13.8 to 21.3 m)

Two-pipe, Direct vent &
Single vent
5 to 50 ft (1.5 to 15.2 m)
(DEFAULT)
51 to 100 ft (15.3 to 30.5 m)
240HX3/340HX3
Indoor
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : O N
No. 7 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : OFF
No. 7 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : O N
No. 7 : O N
540HX3 Indoor
(Upper bank of
DIP switches)
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : O N
No. 4 : OFF
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : OFF
No. 4 : OFF
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : O N
No. 4 : O N
*PVC concentric termination (100112163) installation is applied to the DIP switch settings of 3" venting. (Refer
to page 10.)
• PVC adapter will accept 3" straight pipe.

Exhaust vent collar
with 3" adapter*
(Female)
Intake vent collar with
3" adapter* (Female)
3" straight pipe
3" straight pipe
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.
Exhaust vent collar with
3" adapter (Female)
Intake vent collar
with 3" adapter
(Female)
3" street elbow
with bird screen
3" straight pipe