A.O. Smith GDVT instruction manual Offset Vent Arrangement, Minimum

Pull and connect the 3-1/8 in. (80mm) corrugated tube to the water heater’s flue tube reducer with hi-temp red silicone (included) and gear clamp. Make sure this connection is tight and leak proof.

*The sealant between 3-1/8 in. (80mm) corrugated tube and water heater’s flue tube reducer must be hi-temp red silicone or other material suitable for 600°F (315°C) continuous service.

TOP VIEW

90° MAXIMUM BEND

FIGURE 23

Apply hi-temp red silicone (included) around 6 in. (152mm) collar on air manifold box. Pull corrugated vent tube all the way on to collar and secure with one sheet metal screw (approx. 3/4 in. (19mm) up from edge of vent tube. Pull gear clamp past screw and tighten.

FIGURE 24

Check the level or slope of the venting again, and adjust if required.

SLOPE

FIGURE 25

OFFSET VENT ARRANGEMENT

CONDITION 1:

Where a straight vent arrangement is impossible, a horizontal 90 degree maximum bend can be made. Use the water heater casing outer diameter as a template to form the corrugated tube.

FIGURE 26

CONDITION 2:

Where floor joists impede venting, a rise to complete the vent termination is possible. All installations require 1 in. (25mm) clearance to combustibles.

Note:

A. The maximum horizontal vent length of 80 in. (2.03m) minus wall thickness should be considered when installing an offset vent arrangement.

B. Do not combine condition 1 (Figure 26) with condition 2 (Figures 27 & 28) in the same installation.

C. The maximum allowable drop from vent center-line to vent termination center-line (Figure 28) is 7.25 in. (184mm).

>1 in. (25mm) >1 in. (25mm)

WALL 10 in. (254mm) (REF)

MINIMUM

68 in. (1.72m) FOR

40 gal. MODELS AND

76 in. (1.93m)

FOR 50 gal. AND

50 gal. Hi-INPUT MODELS

FIGURE 27

>1 in. (25mm) >1 in. (25mm)

7.25 in. (184mm)

MAX

WALL 10 in. (254mm) (REF)

MINIMUM

68 in. (1.72m) FOR

40 gal. MODELS AND

76 in. (1.93m)

FOR 50 gal. AND

50 gal. Hi-INPUT MODELS

FIGURE 28

18