T-H3 Installation Manual
19 Page
Installaon
Installaon Manual
-DIP switch settings for vent length-
PVC, CPVC, ABS, or polypropylene vent
WARNING
Adjust the appropriate DIP switches according to model and vent length 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.
Roof
Fire stop
Wall
Connect between exhaust vent collar and piping.
Hanger
Hanger
For details of the optional items, refer to the Installation manual for each optional item.
Set DIP switches shown in the table below depending on the vent diameter and length.
DIP switch settings : Two-pipe, Direct vent installations
Vent diameter
3" (76 mm) venting* 4" (102 mm) venting
5 to 20 ft
(1.5 to 6.1m)
(DEFAULT)
21 to 40 ft
(6.2 to 12.2 m)
41 to 70 ft
(12.3 to 21.3 m)
5 to 50 ft
(1.5 to 15.2m)
(DEFAULT)
51 to 100 ft
(15.3 to 30.5 m)
240/340
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
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
540 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
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
Vent
length
Model
*PVC concentric termination (100112163) installation is applied to the DIP switch settings of 3" (76 mm)
venting. (Refer to p. 10.)
240 340 Computer board
Bank of
DIP switches
540 Computer board
Upper bank of
DIP switches
Lower bank of
DIP switches