21
INSTALLATION INSTRUCTIONS
Appropriate dip switch adjustment shall be required
to allow certain vent length. There are 4 vent
configuration settings, A-0, A-1, A-2, and A-3 settings
at 0-2000 ft (0-610 m) elevation.
Vent Lengths
Before starting the vent installation, careful planning
should be given to the routing and termination of the
vent pipes. The length of the vent pipes (inlet and
outlet) should be kept to a minimum. Also, see pages
26 and 27 for vent terminal placement. Refer to the
maximum and minimum vent length charts for the
pipe sizes that can be used and the total equivalent
length of pipe that can be used. DO NOT exceed
equivalent length of pipe in maximum vent length
chart.
Venting for Direct-Vent Water Heater
The vent termination is not included in the equivalency calculations.
NOTICE: A 90°, ¼ standard bend or long bend elbow is equivalent to 6 ft. (1.83 m) of straight pipe. A 45°, 1/8
standard bend or long bend elbow is equivalent to 2.5 ft. (0.76 m) of straight pipe. A 90°, short bend radius elbow
is equivalent to 12 ft. (3.66 m) of straight pipe.
DO NOT use unequal diameters of pipe and fittings for the vent system.
See examples below.
Short Bend 90° Elbow
OK to Use
Standard Bend 90° Elbow
OK to Use
Long Bend 90° Elbow
OK to Use
Elbow Examples
*The altitude settings for installations at levels greater than 2000 ft (610 m), can be found in the "High-Altitude
Dip Swich Adjustments" section of this manual. DIP switch changes will be necessary at higher altitudes.
SINGLE UNIT: MAX. EQUIVALENT
VENT LENGTHS - STRAIGHT PIPE
Number of 90° Elbows
Max Length 2"
Straight Pipe
Max Length 3"
Straight Pipe
0 60 ft. (18.3 m) 150 ft. (45.7 m)
1 54 ft. (16.5 m) 144 ft. (43.9 m)
2 48 ft. (14.6 m) 138 ft. (42.7 m)
3 42 ft. (12.8 m) 132 ft. (40.2 m)
4 36 ft. (11.0 m) 126 ft. (38.4 m)
5 30 ft. (9.1 m) 120 ft. (36.6 m)
6 24 ft. (7.3 m) 114 ft. (34.7 m)
EQUIVALENT FT. OF ELBOWS
2" Pipe 3" Pipe
90° 6 ft. (1.83 m) 6 ft. (1.83 m)
45° 3 ft. (0.9 m) 3 ft. (0.9 m)
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