Installation Manual

38 Rinnai Tankless Rack System (TRS) Installation Manual
Mulple rack systems should be installed in parallel using a secondary manifold from the building’s cold and hot
water supply. Reference the drawing on the following page for guidance on plumbing mulple racks in a parallel
piping system.
A low pressure gas regulator must be installed prior to the rack system. Note the maximum cumulave input for the
system when sizing the gas regulator.
Use common plumbing pracce and reference all applicable codes when sizing the secondary manifolds and gas
regulator.
Each Rinnai Tankless Water Heater on the rack system comes installed with isolaon valves and a pressure relief
valve. Refer to the “Rinnai Tankless Water Heater Installaon and Operaon Manual” for informaon on piping the
isolaon valves and pressure relief valve.
Isolaon Valves
Pressure Relief Valve
Plumbing
8
Hot Water
Isolaon Valve
Cold Water
Isolaon Valve
Pressure Relief Valve Piping
Piping for Mulple Racks