Installation Manual

36 Rinnai Tankless Rack System (TRS) Installation Manual
For complete venng opons and installaon instrucons, refer to the “Rinnai Tankless Water Heater Installaon and
Operaon Manual.” Venng components are packaged separately from the pre-assembled rack for eld assembly of
the vent system by the contractor.
The following vent opons are available:
• Direct Vent with Concentric Pipe
• Direct Vent with Twin Pipe
• Common Vent
Venting
7
Direct Vent Non-Direct (Room Air) Vent
Mulple water heaters sharing a combuson air
header and a separate exhaust header that vents
directly through separate penetraons to the outside.
Mulple water heaters using room air for
combuson while sharing an exhaust header
that vents directly to the outside.
Common Vent (Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)
Combuson Air
Exhaust
Exhaust
Room Air
For Combuson
Combuson air and exhaust vent directly
through a single concentric connecon. Hot
exhaust exits through the interior tube, while
combuson air enters through the outer layer.
Exhaust
Combuson
air
Exhaust
Combuson
air
Combuson
air
Direct Vent (Concentric Pipe)
Combuson air and exhaust vent directly
through separate penetraons.
Direct Vent (Twin Pipe)
IMPORTANT
HE+ Series tankless water heaters must use concentric venng with a metal exhaust pipe. Refer to the
Installaon and Operaon Manual supplied with the HE+ Tankless Water Heater for venng opons.