Condensate Piping And Drain - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 4: Installation Instructions
TABLE 4-2: MODULEX EXT Minimum/Maximum Flow Rates
BOILER MODEL
Min. flow rate demanded
in gpm ∆T 27°F (15°C)
Min. flow rate demanded
in gpm ∆T 36°F (20°C)
Max flow rate demanded in
gpm ∆T 27°F (15°C)
Max flow rate demanded in
gpm ∆T 36°F (20°C)
The water side resistance curve of the boiler is shown in the diagram in Figure 4-7.
The pump is not an integral part of the boiler. It is recommended to choose a pump with the rate and
delivery head at about 2/3 of its characteristic heating curve.
Figure 4-7: MODULEX EXT Water Side Pressure Losses
NOTE: The use of a mixing header fitted between the boiler circuit and the system circuit is always
advisable. It becomes INDISPENSABLE if the system requires flow rates superior to the maximum
permitted boiler flow rates, which is to say lower than 27° F (15 K).

4.14 Condensate Piping And Drain

To avoid condensate collecting inside the combustion exhaust system, the condensate piping must
slope toward the drain at least 3/8 inch per foot (30 mm/m).
The liquid column, inside the condensate siphon, (see Condensate Siphon Filling Plug in Figure 4-8)
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
OMM-0160_A • DRAFT
EXT 1500 2S
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Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
EXT 2300 2S EXT 2600 2S
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115 134
EXT 3000 2S
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