Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions
Page 36 of 144 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0095_0H
09/15/2017 Phone: 800-526-0288 GF-139
TABLE 4-2: MODULEX EXT Minimum/Maximum Flow Rates
BOILER MODEL
EXT
EXT
EXT
EXT
EXT
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 4-8.
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 4-8: 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).
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).
2295
2677
3060
1530
To Next Page
Loading...
