21
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 Figure 15. The Tee fitting's
1/2 inch 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 Figure 16. If the
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.
Adjustment Procedure:
21. Ensure the water heater is turned off at the on/off switch on
the front of the water heater.
22. Disconnect the Blocked Intake Air switch sensing tube, see
Figure 3 on page 8 for location.
23. Loosen the large hose clamp on the Fernco coupling that
connects the intake air connection pipe to the Combustion
blower, see Figure 16.
24. 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 Figure 15.
25. Retighten the large hose clamp on the Combustion Blower
intake air Fernco coupling,
26. Reconnect the Blocked Intake Air switch sensing tube making
sure the sensing tube is securely connected at both ends and
is not kinked.
INTAKE AIR CONNECTION PIPE
LARGE HOSE
CLAMP
3 INCH PVC
INTAKE AIR
TEE FITTING
FERNCO
COUPLING
Figure 16
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.
18. 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.
19. Ensure the intake air connection Tee fitting is oriented properly,
see page 22 for instructions.
20. Carefully read the Venting Requirements on page 21 and then
proceed to the Venting Installation Sequence on page 22.
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 Figure 14.
FACTORY INSTALLED
INTAKE AIR TEE FITTING
COMBUSTION BLOWER ASSEMBLY
COMBUSTION BLOWER
1/2 INCH
BRANCH
HOSE BARB FITTING FOR
BLOCKED INTAKE AIR
SWITCH SENSING TUBE
FERNCO
COUPLING
Figure 14
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 Figure 15. If the barb fitting
is 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.
90° TO 130°
CORRECT ORIENTATION
INTAKE AIR TEE FITTING
END VIEW
Figure 15
