MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
OMM-0087_0F
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
41
of
146
GF-143
Phone: 800-526-0288
07/13/15
Table 3-2: MODULEX EXT Minimum/Maximum Flow Rates
Boiler Model
321 481 641 802 962 1123
Min. flow rate demanded in gal/min ∆T 27°F (15°C)
2.5
2.5
2.5
2.5
2.5
2.5
Min. flow rate demanded in gal/min ∆T 36°F (20°C)
1.9
1.9
1.9
1.9
1.9
1.9
Max flow rate demanded in gal/min ∆T 27°F (15°C)
24.5 36.8 49.2 61.7 74.2 86.8
Max flow rate demanded in gal/min ∆T 36°F (20°C)
18.4 27.6 36.9 46.3 55.6 65.1
The water side resistance curve of the boiler is shown in the diagram in Figure 3-18.
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 3-18: 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).
