Installation manual

Rinnai CVent 18
Installaon Instrucons
Exhaust Vent Installaon Procedures:
• Aer ensuring the water heaters are mounted securely and
spaced 20.5” apart, install the appliance adapter on top of
the water heaters.
• Exhaust Venng is designed for a 3° rise. When the water
heaters are mounted at 20.5” spacing, the height increase is
1” per water heater. A 4” diameter extension pipe is
included with the kit that must be cut to length to account
for the rise from unit to unit. Aer cung, always deburr and
bevel the end of the vent piece so the sealing gaskets are not
damaged and operaon of the vent system is not
compromised.
• Install the elbows with hand cleanout cap to the 4” diameter
extension pipe. Do not cut or modify the elbow. Cleanout cap
should remain accessible for periodic inspecon and access
for service when needed.
• Aer combuson air and exhaust vent components are
appropriately posioned, securely fasten the “CVent
Appliance Adapter with Check Valve and Trap” to the top of
the water heater with a self tapping screw.
• Connect the combuson air opening of the appliance adapter
to one end of the ex connector and the other end of the ex
connector to the Combuson Air Collector.
• Connect the open end of the elbow to the exhaust header.
Securing Screw
Elbow
hand cleanout cap
4” Extension
Appliance
Adapter
Combustion Air Collector
Flex Connector
Elbow
Exhaust Collector