Modulex Light Commercial Series
CHAPTER 4: Installation Instructions
OMM-0158_A
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4.16 Condensate Piping And Drain
To avoid condensate collecting inside the combustion exhaust system, the condenate piping must
have an inclination toward the drain of at least 3/8 in./ft (30 mm/m).
The liquid column, inside the condensate siphon, (see Condensate Siphon Plug in Figure 4-18)
needs to be filled with water after installation. The minimum height of the water in the column,
when all the fans are in operation, must be at least 25 mm (1 in.).
In order to avoid ice formation while the boiler is operating, which can cause the boiler to stop
functioning, the entire condensate evacuation system must be well insulated. Note that it is
forbidden to evacuate the condensate through an open gutter to prevent the risk of ice forming
and avoid exposure of the corrosive condensate to the external environment.
The condensate must be neutralized before being evacuated to the sewer, which can be achieved
by mixing the condensate with lime or with drain water coming from washing machines, dish
washing machines, etc., which normally has a base pH.
The connection to the sewer will be through a closed, but visible drain. Given the high acidity (pH
3 to 5) of the condensate, only plastic material may be used for the condensate evacuation pipes.
Moreover it must be dimensioned and constructed so as to allow the correct out-flow to the drain,
preventing any bottleneck and any leakage.
Consult local codes regarding condensate neutralization. Neutralization may be obtained by
mixing it with the buildings drain water or with limestone, which normally has a base pH. AERCO
offers a condensate neutralizing kit and a neutalizing tank for preparing condensate waste for
safe evacuation into a sewer system.
Figure 4-18:
MODULEX EXT Condensate Piping
The outlet of the condensate drain pipe exits from the right side of the boiler, just below the
RIGHT-SIDE flue outlet opening.
I M P O R T A N T !
If it is not possible to
use a 4’’ (101mm) base or housekeeping pad on which to place the boiler,
install the boiler on the floor and provide a well or trough (minimum of
4’’ - 101 mm deep) in
which to lodge the U of the condensate piping. See Figure 4-18.
