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Secondary Circuit
Cascaded Boilers
Space Heating Only
Figure 10 - Cascaded Space Heating
NOTES:
1. This drawing is meant to show system piping concept only.
2. Install a minimum of 12 diameters of straight pipe upstream of all circulators.
3. Piping shown is Primary/Secondary.
4. System flow (secondary loop) should be greater than the boiler primary loop flow. In all cases, the boiler primary loop flow rate must be
maintained above the minimum flow rates published in this manual.
5. Installations must comply with all local codes.
6. In Massachusetts, a vacuum relief valve must be installed in the cold water line per 248 CMR.
The piping will not support the weight of the circulators. Refer to the circulator manufacturer's instructions to properly support
the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.
Primary Loop
Primary Loop
WHL-052 Rev. 4.28.16
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