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Common venting allows multiple Rinnai Tankless Water Heaters to share the same vent system. Rinnai water heaters can only be common vented with Schedule 40 PVC/CPVC or with the Rinnai certified common vent system. Figure 47: Example:Rinnai Common Venting Figure 48:Example: Schedule 40 PVC/CPVC Common Venting General Guidelines AWARNING When installing common vent, follow these guidelines: • Use only the materials listed in this manual • DO NOT slope the combustion air pipe for vent, air intake pipe, and fittings. Failure to toward unit. Failure to comply with this comply with this warning could result in prop- warning could result in property damage, erty damage, personal injury, or death. personal injury, or death. • When cutting vent components, ensure that • DO NOT apply PVC/CPVC glues, the cuts are straight. solvents, or cleaners to the tankless water heater's intake or exhaust gasket • Chamfer and deburr all edges before install- connections. Failure to correctly assem- ing the components. ble the components according to these • Vent joints must not leak. Confirm gas tight instructions may result in property dam- connections of every vent joint. age, personal injury, or death. • Before operating the water heater(s), ensure • DO NOT obstruct combustion air flow or vent system is clean and free of debris. exhaust gas flow in the venting system. • Vent system must be supported according to • DO NOT install the water heater in an the vent manufacture's installation instruc- area with negative air pressure. tions. • DO NOT combine the common vent • Venting should be as direct as possible with a system with existing vents, chimneys, minimum number of fittings. or vent pipes connected to other water • The common vent system must only be in- heaters, boilers or appliances. stalled by a trained and qualified professional. • DO NOT common vent different Rinnai models in a single common vent system. Common Vent Termination Clearances • DO NOT use cellular core PVC/CPVC, • Vent termination perANSI Z223.1/NFPA 54. Radel,ABS or galvanized materials. For clearances not specified in ANSI Z223.1/ • DO NOT combine vent components from NFPA 54, clearances are in accordance with different manufacturers. local installation codes and the requirements of the gas supplier. • Refer to section "4.5 Vent the Water Heater" for additional clearance requirements specific to the installation application. Rinnai Tankless Water Heater Installation and Operation Manual 48