AERCO Modulex EXT 1530 - 3060 - Manual (Page 32)

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