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20
MAXIMUM OF 12”OR
4 PIPE DIAMETERS
CONTROLLER
SENSOR
5’ MAX
Reverse return piping is a proper method of manifolding multiple boiler hook-ups to ensure balanced flow through each boiler. Valves on
supply and return are needed to isolate any boiler, as required.
Fig. 25: Multiple-Boiler– Reverse Return Hook-Up—Models 133–4001