Installation manual
Rinnai CVent 22
Installaon Instrucons
Install the Condensate Trap and Drain Pipe
The CVent exhaust header collects condensate. A collector
and self-priming trap is included with each starter kit.
Addional condensate trap loop assemblies are provided
with each appliance adapter. Condensate loops must be
primed before operaon per the instrucons provided
below.
Condensate must be drained to prevent the malfuncon,
diagnosc code failures, or property damage. Condensate
should be disposed according to local codes. Refer to the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the
Natural Gas and Propane Installation Code, CSA B149.1
condensate disposal.
A condensate pump must be used if the condensate outlet is lower than the public sewage system.
Rinnai recommends installing a condensate neutralizer which allows condensate to ow through neutralizing
media to raise the pH of the condensate to a level that will help prevent corrosion of the drain and public sewer
system.
Ensure that the condensate drain does not freeze.
Long Vent Run or Restricted Rise
An inverter coupling kit with a condensate trap is available to reduce the rise of the exhaust vent. A diagram of
its installaon is shown below.
The male-male and female-female connectors must be used so that the venng is oriented correctly (condensate
runs down vent in the correct direcon).
Condensate trap with check valve
Female-Female Connector
Male-Male Connector
Drain hose -
DO NOT LOOP THE
DRAIN HOSE
3°
3°
Drain condensate in
accordance with local
building codes.
Ubbink condensate
trap installed on
exhaust vent trunk
Condensate traps or
loops are included
with each adapter
All traps loops
must be primed
before operaon.
Priming Trap Loops
• Unthread and remove the cap located at the top of each Inspection
Elbow.
• Pour clean water into the inspection elbow until fluid is visible in the
drain tube of the adapter or until fluid exits the condensate outlet on
the bottom of the tankless water heater.
• Thread the cap back onto the inspection elbow.