Installation Manual

Demand Duo™ R-Series Installation and Operation Manual 36
Notes: • Installation must conform to applicable code and all requirements listed in the installation manual.
Balancing valves, equivale
nt piping, pres-
sure gauges, and temperature gauges are to be used as necessary to ensure proper flow between units.
• Common venting of this Category 1, fan
-assisted appliance is permitted. Consult the latest version of the National Fuel Gas Code
(ANSI
Z223.1/NFPA 54).
BUILDING CIRCULATION PUMP AND HOT WATER RETURN LINE (OPTIONAL)
Additional units can be installed as illustrated.
PIPE EACH T&P AND PRV TO OPEN DRAIN
Gas Supply
Cold Water Supply
Hot Water Supply Line
Figure 33