Takagi AT-D3U-OS User Manual

21 Page
Installaon
Installaon Manual
Two-Pipe, Direct-Vent Installaon Examples
Vertical
condensation
drain**
Horizontal Installaon
Wall
Hanger
Hanger
Sidewall vent

Backflow
preventer*
Fire stop
Vercal Installaon
Vertical
condensation drain**
Backflow
preventer*
Rain cap

Hanger
Wall
Direct-vent
concentric

Horizontal Installaon with
direct-vent concentric terminaon
(Refer to p.10)
110U Indoor (AT-KJr3U-IN)
310U Indoor (AT-K5U-IN)
510U Indoor (AT-D3U-IN)
(Upper bank of DIP switches)
Vent length
No. 6 : O N
No. 7 : OFF
No. 8 : OFF
No. 3 : O N
No. 4 : OFF
No. 5 : OFF
0 to 20 ft.
(0 to 6.1 m)
No. 6 : OFF
No. 7 : OFF
No. 8 : OFF
No. 3 : OFF
No. 4 : OFF
No. 5 : OFF
21 to 40 ft.
(DEFAULT)
(6.2 to 12.2 m)
No. 6 : O N
No. 7 : O N
No. 8 : OFF
No. 3 : ON
No. 4 : ON
No. 5 : OFF
41 to 60 ft.
(12.3 to 18.3 m)
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8
DIP switch settings for direct vent installation
*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.
Direct-vent sidewall Installaon
(Refer to p.23)
1 ft. (305 mm)
min.
0.4 ft.
(130 mm)
min.
0.4 ft.
(130 mm)
min.
Exhaust
Intake
Exhaust
Intake

Takagi AT-D3U-OS Specifications

General

Brand	Takagi
Model	AT-D3U-OS
Category	Water Heater
Language	English