Venting Terminations And Sizing; Vent Screen Installation - American Water Heater Powerflex Installation And Operating Manual

Venting Terminations And Sizing

•
Refer to Table 3 for vent pipe materials and sizing. If
the installation requires a vent riser, suitable drainage
must be provided to ensure condensation does not
accumulate (see Figure 35). Termination through a roof
is shown Figure 22.

Vent Screen Installation

Installed in the vent termination elbow, the vent screen
is required to keep foreign objects, rodents and small
birds from entering the venting system. These screens
have been sized to ensure maximum energy effi ciency of
the vent system based on the "equivalent length" of the
vent piping. CHOOSE ONLY the ONE SCREEN THAT
MATCHES YOUR VENTING CONFIGURATION (see
Figure 28 & Figure 29). How to determine the "equivalent
length" is shown in Table 3.
•
Supplied with this heater are several vent termination
screens (see Figure 28 & Figure 29).
•
Install the appropriate vent screen into the vent
termination elbow.
•
Gently push the screen into the termination elbow until
it sits against the inside shoulder.
•
The metal wire screens are self-securing.
•
Plastic screens must be secured with (2) drops of
silicone sealant. This will allow for easy removal for
inspection and cleaning.
For heater models 40-40 & 50-45
with 2" venting (short)
VENT LENGTH LESS THAN OR
EQUAL TO 20 EQUIVALENT FT.
USE THIS SCREEN (SUPPLIED).
with 3" venting
FOR ALL LENGTHS OF VENTING
USE THIS SCREEN (SUPPLIED).
Figure 28
30
with 2" venting (long)
VENT LENGTH GREATER THAN
20 EQUIVALENT FT.
USE THIS SCREEN (SUPPLIED).
with 4" venting
VENT LENGTH GREATER THAN
125 EQUIVALENT FT.
USE THIS SCREEN (SUPPLIED).
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Note: The same screens should be installed in the intake
and the exhaust piping. These screens are supplied in the
vent kit. In the concentric vent application, screen is to be
installed in the exhaust piping only.
Important: Failure to install the appropriate screen in the
vent termination elbows could result in improper heater
operation with attendant risk of property damage, personal
injury or death by fi re or carbon monoxide poisoning.
For heater models 50-58, 50-62, 75-72 & 75-76
with 3" venting (short)
VENT LENGTH LESS THAN OR
EQUAL TO 20 EQUIVALENT FT.
USE THIS SCREEN (SUPPLIED).
with 4" venting
VENT LENGTH GREATER THAN
50 EQUIVALENT FT. USE THIS
SCREEN (SUPPLIED).
Figure 29
with 3" venting (long)
VENT LENGTH GREATER THAN
20 EQUIVALENT FT.
USE THIS SCREEN (SUPPLIED).
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