Rinnai RU98i Installation Manual page 31

Installation Instructions
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.
Additional condensate trap loop assemblies are provided
with each appliance adapter. Condensate loops must be
primed before operation per the instructions provided
below.
Condensate must be drained to prevent the malfunction,
diagnostic 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 flow 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.
Priming Trap Loops
•
Unthread and remove the cap located at the top of each
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.
Long Vent Run or Restricted Rise (Applicable where allowed by code)
An inverter coupling kit with a condensate trap is available to reduce the rise of the exhaust vent. A diagram of
its installation is shown below.
The male-male and female-female connectors must be used so that the venting is oriented correctly (condensate
runs down vent in the correct direction).
Drain condensate in
accordance with local
building codes.
Male-Male Connector
3°
Drain hose -
DO NOT LOOP THE
DRAIN HOSE
Ubbink condensate
trap installed on
exhaust vent trunk
Condensate traps or
loops are included
with each adapter
All traps loops
must be primed
before operation.
Inspection
Female-Female Connector
3°
Condensate trap with check valve
31 Rinnai CVent