AM Series Boiler & Water Heater User Manual
CHAPTER 4: INSTALLATION
– PIPING
OMM-0100_E
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GF-146
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11/15/2019
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and may require a larger circulating pump, and a revised temperature rise specification based
on the water chemistry of the water to be heated.
Size your water system according to the following hardness guidelines to prevent scaling of the
heat exchanger. See Figure 4-4 for corresponding water flow.
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If the water is 5 to 8 grain per gallon, this is SOFT water and you have to size the system for
a 4 ft/sec minimum water velocity.
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If the water is 8 to 18 grain per gallon, this is NORMAL water and you have to size the
system for a 4 to 8 ft/sec minimum water velocity.
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If the water is 18 to 23 grain per gallon, this is HARD water and you have to size the system
for a 8 ft/sec minimum water velocity.
Figure 4-4: AM Series Water Velocity and Flow Graph
