Venting Requirements - State Water Heaters 301 Series Instruction Manual

during severe cold weather. To prevent the recirculation of flue
gases, maintain as much distance as possible between the
intake air and vent terminations.
15. Do not locate the vent termination over a public area where
condensate or vapor can cause a nuisance or ice hazard.
16. Ensure the screens in the factory supplied terminations are
securely installed to prevent blockage in the vent system.
17. Stress levels in pipe/fittings can be significantly increased by
improper installation. If rigid pipe clamps are used to hold the
pipe in place, or if the pipe cannot move freely through a wall
penetration, the pipe may be stressed, or high thermal stresses
may be formed when the pipe heats up and expands. Install
accordingly to minimize such stresses.
18. Ensure the intake air connection Tee fitting is oriented properly,
see page Intake Air Connection section for instructions.
19. Carefully read the

Venting Requirements

proceed to
Venting Installation Sequence
INTAKE AIR CONNECTION
The water heaters covered in this manual are factory equipped
with a unique Combustion Blower and intake air connection Tee
fitting. The Tee is a 3" x 3" x 1/2" fitting. The intake air connection
Tee fitting has a hose barb installed in the 1/2 inch branch to
connect the Blocked Intake Air switch sensing tube, see
FACTORY INSTALLED
INTAKE AIR TEE
FITTING
1/2 INCH
BRANCH
HOSE BARB FITTING FOR
BLOCKED INTAKE AIR
SWITCH SENSING TUBE
Figure 14. Combustion Blower Assembly
Ensure the hose barb installed in the Tee fitting IS NOT facing
down towards the ground (180° - 6 o'clock position) before venting
installation begins. The barb fitting must be angled between 90°
and no more than 130° as shown in
facing down, residual condensate that occasionally forms in the
intake air pipe can drain into the Blocked Intake Air switch through
the attached sensing tube and damage the switch. This condition
can also lead to Blocked Intake Air fault conditions and associated
control system lock outs.
END VIEW
Figure 15. Orientation of Intake Air Tee Fittings
The intake air Tee fitting is factory installed with the 1/2 inch
branch and hose barb angled to the right at approximately 130°
when viewed from the end, see
(page 22) and then
(page 23).
Figure 14
COMBUSTION
BLOWER
FERNCO
COUPLING
. If the barb fitting is
Figure 15
90° TO 130°
. The Tee fitting's 1/2 inch
Figure 15
branch and hose barb must not be angled any lower (towards the
ground) than this factory specification. Angling higher, up to a 90°
position, will not adversely affect operation and is acceptable.
INSPECT/ADJUST INTAKE AIR TEE FITTING
Inspect the angle of the Tee fitting's 1/2 inch branch and hose
barb while viewing from the end of the Tee. See
angle of the Tee fitting 1/2 inch branch and hose barb is lower
than shown, adjustment will be necessary. To adjust the intake
air Tee fitting angle follow the steps listed below.
1. Ensure the water heater is turned off at the on/off switch on the
front of the water heater.
2. Disconnect the Blocked Intake Air switch sensing tube, see
(page 8) for the location.
Figure 3
3. Loosen the large hose clamp on the Fernco coupling that
connects the intake air connection pipe to the Combustion
blower. See .
Figure 16
4. Adjust the angle of the Tee fitting so that the 1/2 inch branch
and hose barb are at the proper angle as shown in
5. Retighten the large hose clamp on the Combustion Blower
intake air Fernco coupling,
6. Reconnect the Blocked Intake Air switch sensing tube making
sure the sensing tube is securely connected at both ends and
.
is not kinked.
LARGE HOSE
CLAMP
INTAKE AIR
TEE FITTING
Figure 16. Intake Air Connection Pipe
VENTING REQUIREMENTS
FIELD-SUPPLIED FITTINGS
Field-supplied fittings should be equivalent to the piping material
being installed. Field-installed/supplied fittings will add equivalent
feet to the vent or intake air piping as indicated below. All field-
supplied/installed fittings and piping must be factored into the
equivalent feet calculations.
• 90° elbows (short or long radius) are equivalent to 5 linear
feet (152 cm) of pipe.
• 45° elbows (short or long radius) are equivalent to 2.5
linear feet (76 cm) of pipe.
PRIMER AND CEMENT
Tetrahydrofuran (THF) primer should be used to prepare the
surfaces of pipe and fittings for solvent welding. If CPVC or ABS
pipe and fittings are used, then the proper cement must be used
for all joints, including joining the pipe to the factory provided
terminations (PVC material). PVC Materials should use ASTM
D-2564 Grade Cement; CPVC Materials should use ASTM F-493
Grade Cement.
22
If the
Figure 15.
.
Figure 15
FERNCO
COUPLING
3 INCH PVC