Takagi AT-KJr3U-IN Installation Manual And Owner's Manual page 21

Two-Pipe, Direct-Vent Installation Examples
110U Indoor (AT-KJr3U-IN)
310U Indoor (AT-K5U-IN)
ON 1 2 3 4 5 6 7 8 9 10
OFF
ON 1 2 3 4 5 6 7 8 9 10
OFF
ON 1 2 3 4 5 6 7 8 9 10
OFF
Horizontal Installation
Hanger
Vertical
condensation
drain**
Backflow
preventer*
*Backflow preventer (Recommended for freezing weather
conditions: 36 °F (2 °C) and below).
**Vertical condensation drain must be installed in accordance with
local codes. It is
required to be installed in the venting system when there
is more than 5 ft. (1.5 m) of equivalent vent length, not including the sidewall
termination. 90° elbow is equivalent to 5 ft. (1.5 m) of vent length.
Horizontal Installation with
direct-vent concentric termination
(Refer to p.10)
Wall
Direct-vent
concentric
termination
DIP switch settings for direct vent installation
510U Indoor (AT-D3U-IN)
(Upper bank of DIP switches)
No. 6 : O N
ON 1 2 3 4 5 6 7 8
No. 7 : OFF
OFF
No. 8 : OFF
No. 6 : OFF
ON 1 2 3 4 5 6 7 8
No. 7 : OFF
OFF
No. 8 : OFF
No. 6 : O N
ON 1 2 3 4 5 6 7 8
No. 7 : O N
OFF
No. 8 : OFF
Wall
Hanger
Sidewall vent
termination
1 ft. (305 mm)
21
Vent length
No. 3 : O N
0 to 20 ft.
No. 4 : OFF
(0 to 6.1 m)
No. 5 : OFF
21 to 40 ft.
No. 3 : OFF
No. 4 : OFF (DEFAULT)
No. 5 : OFF
(6.2 to 12.2 m)
No. 3 : ON
41 to 60 ft.
No. 4 : ON
(12.3 to 18.3 m)
No. 5 : OFF
Vertical Installation
Backflow
preventer*
Direct-vent sidewall Installation
(Refer to p.23)
Exhaust
Exhaust
Intake
Intake
0.4 ft.
min. (130 mm)
min.
Page
Installation Manual
Installation
Rain cap
Roof flashing
Fire stop
Hanger
Vertical
condensation drain**
0.4 ft.
(130 mm)
min.