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State SDV 75 70 NE/PE User Manual

Page 17

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17

VENTING AND INSTALLATION

Plan the layout of the vent system from the vent termination to the water
heater considering all of the 90° and 45° elbows plus the number of
feet of pipe that would be needed to install the total vent system. Note:
The inlet connection to the blower requires a minimum 3" long x 3"
Schedule 40 PVC pipe. The water heater must be vented to the outdoors
as described in these instructions. DO NOT connect this water heater
to an existing vent or chimney. It must be vented separately from all
other appliances. The fi ttings, other than the supplied Vent Termination
should be equivalent to the following: PVC (Schedule 40, DWV, ASTM
D-2665), CPVC (Schedule 40, DWV, ASTM F-438), ABS (Schedule 40
DWV, ASTM D-2661).

The cement used should be as recommended by the vent
pipe manufacturer. See the instructions in the “VENT PIPE
PREPARATION” section of this manual for the proper method of
cutting and cementing the PVC pipe and fi ttings.

All vent gases must be completely vented to the outdoors of the
structure (dwelling). When determining the installation location for
a power direct vent water heater, snow accumulation and drifting
should be considered in areas where applicable.

FIGURE 15.

Horizontal runs must be securely supported at 3 1/2 foot (1 m)
intervals and vertical runs supported at 5 foot (1.5 m) intervals.

FIGURE 16.

VENTING THROUGH AN OUTSIDE WALL

All 75 Gallon Models

In the carton is supplied:

1. Two 3” inlet and outlet PVC Schedule 40 - 45° vent caps.

2. One 3” CPVC Schedule 80 - 90° elbow; used to connect the outlet

vent pipe to the water heater when the outlet vent pipe is to be
turned horizontally directly off the blower.

3. One 5’ (1.5 m) section of 3” CPVC Schedule 40 outlet vent pipe.

(More may be required and must be purchased locally.)

Note: A 2-5/8" (66.675 mm) long section of CPVC pipe can be cut
from the 5' (1.5 m) section of 3" CPVC Schedule 40 vent pipe.
This is used to connect the outlet vent pipe elbow to the water
heater when the outlet vent pipe is to be turned horizontally
directly off the blower.

FIGURE 17.

Requirements:

1. The water heater requires its own (separate) venting system.
2. Only 3” CPVC Schedule 40 piping and fi ttings are acceptable

materials on the fi rst fi ve feet of the outlet vent system.

3. 3” PVC, ABS, or CPVC Schedule 40 piping and fi ttings are

acceptable materials for the inlet vent system and for the outlet
vent system after the fi rst fi ve feet.

4. The unit cannot be connected to existing vent piping or chimney.
5. When venting through an outside wall, the vents must terminate

horizontally to the outdoors.