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14 condensate piping and drain, Modulex ext – AERCO Modulex EXT 1530 - 3060 User Manual

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MODULEX EXT

1530, 1912, 2295, 2677, 3060 Boilers

Installation, Operation & Maintenance Manual

Table 3-2: MODULEX EXT Minimum/Maximum Flow Rates

Boiler Model

EXT 1530 EXT 1912 EXT 2295 EXT 2677 EXT 3060

Min. flow rate demanded in

gpm ∆T 27°F (15°C)

5

5

5

5

5

Min. flow rate demanded in

gpm ∆T 36°F (20°C)

4

4

4

4

4

Max flow rate demanded in

gpm ∆T 27°F (15°C)

102

128

153

179

205

Max flow rate demanded in

gpm ∆T 36°F (20°C)

77

96

115

134

153

The water side resistance curve of the boiler is shown in the diagram in Figure 3-8.
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 3-8: 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).

3.14 Condensate Piping and Drain

To avoid condensate collecting inside the combustion exhaust system, the condenate piping

must slope toward the drain at least 3/8 in./ft (30 mm/m).
The liquid column, inside the condensate siphon, (see Condensate Siphon Filling Plug in Figure

3-9) 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.).

Page 32 of 138

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913

OMM-0095_0E

12/01/14

Phone: 800-526-0288

GF-139