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The chart below represents the combined flow rates and pipe sizes when using multiple boilers to design the manifold system for
the primary circuit. To size, simply add up the number of boilers and the required flow rates for the system design temperature.
Example: (5) 220 Model boilers with a design of 20°Δt degree temperature rise with each boiler having an individual flow rate of
22 GPM. To correctly size the manifold feeding these (5) boilers you would need a pipe size of 4".
Flow Rate (GPM)
16
22
Pipe Dia. (In.)
Table 6 - Multiple Boiler Manifold Piping
Flow Rate (GPM) 120 132
Pipe Dia. (In.)
Table 7 - Multiple Boiler Manifold Piping
H. Check / Control Water Chemistry
NOTE: Boiler failure due to improper water chemistry is not
covered by warranty.
Water Chemistry*
• Sodium less than 20 mGL
• Water pH between 6.0 and 8.0
• Maintain water pH between 6.0 and 8.0. Check with
litmus paper or have it chemically analyzed by water
treatment company.
• If the pH differs from above, consult local water
treatment for treatment needed.
• Hardness less than 7 grains
• Consult local water treatment companies for
unusually hard water areas (above 7 grains hardness).
• Chlorine concentration less than 100 ppm
• Using chlorinated fresh water should be acceptable
as levels are typically less than 5 ppm.
• Do not connect the boiler to directly heat swimming
pool or spa water.
• Do not fill boiler or operate with water containing
chlorine in excess of 100 ppm.
*NOTE: It is recommended to clean the heat exchanger at
Multiple Boiler Manifold Piping
24
30
32
33
40
44
2
Figure 6 - Multiple Boiler Manifold Piping
Multiple Boiler Manifold Piping
150
160 170 179 200 210 239 240 250 255 300 340
4
45
48
50
55
60
66
2 1/2
5
least once a year to prevent lime scale buildup. To clean the
heat exchanger, follow the maintenance procedure in this
manual.
Hardness: Less than 7 grains
Chloride levels: Less than 100 ppm
pH levels: 6 - 8
TDS: Less than 2000 ppm
Sodium: Less than 20 mGL
Clean system to remove sediment*
1. You must thoroughly flush the system (without boiler
connected) to remove sediment. The high-efficiency heat
exchanger can be damaged by buildup or corrosion due to
sediment.
2. For zoned systems, flush each zone separately through a
purge valve. (If purge valves and isolation valves are not already
installed, install them to properly clean the system.)
3. Flush system until water runs clean and you are sure piping is
free of sediment.
*NOTE: It is recommended you clean heat exchanger at
least once a year to prevent lime scale buildup. Follow the
maintenance procedure to clean the heat exchanger in the
Maintenance Section of this manual.
75
80
85
88
90
100
3
350
400 425
510
595
6
WHL-052 Rev. 4.28.16
17
110
4
680
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