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
1530/1500
EXT
1912
EXT
2295/2300
EXT
2677/2600
EXT
3060/3000
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).
EXT
2295
2300
EXT
2677
2600
EXT
3060
3000
EXT
1912
EXT
1530
1500