Horizontal Flue Runs; Typical Installation – Horizontal Terminal With One Bend - Rheem 27 Owner's Manual And Installation Instructions

FLUEING

HORIZONTAL FLUE RUNS

There are a number of basic installation requirements which must be followed for a flue installation
incorporating horizontal flue runs.
Failure to observe these precautions can lead to the premature failure of the flue system and / or
water heater.
•
The flue must be installed with the seam of the inner flue
toward the top of the installation.
•
A horizontal section of flue must be installed with a
gradient of 20 mm per metre (1 in 50 or 1° fall) of
horizontal run.
•
A horizontal run of flue between two bends, where the
bend closest to the flue terminal is orientated upward,
must a gradient upward to the flue terminal.
A Condensate Drain Section must be installed as close as practicable to the water heater if the flue
is installed with an upward gradient. Refer to
This ensures any condensate formed during operation of the water heater is prevented from
draining back into the water heater.
•
A horizontal run of flue connecting directly to a Horizontal Flue Terminal must a gradient downward to
the flue terminal.
This prevents rainwater from entering the flue draining back into the water heater.
Use Male to Male and Female to Female Adapters to reverse the direction of flue insertion where
two or more sections of flue are used in a horizontal flue run and the flue drains toward the flue
terminal. Refer to the diagram
page 62.
This provides for proper draining of condensate without pooling at the flue component joins.
"Typical Installation – Horizontal Terminal with One Bend"
Typical Installation – Horizontal Terminal with One Bend
"Draining the Condensate"
62
on page 60.
on