Installation Manual

H-Series Demand Duo™ 2 Installation and Operation Manual 36
When connecting multiple units, balancing valves, equivalent piping, pressure gauges, and temperature gauges are to
be used as necessary to ensure proper flow between units.
Hot Water Supply Line
Condensate
Drain Line
Cold Water Supply
Gas Supply
Building
Circulation Pump
Pipe Temperature and
Pressure Relief (T&P)
Valve to Open Drain
Building Hot Water
Return Line (Optional)
LEGEND
Union
Ball Valve
Check Valve
Circulation Pump
Expansion Tank