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• Slope the venting toward the appliance
according to the vent manufacturer's
installation instructions.
• All condensate must drain and be disposed of
according to local codes.
• Use only corrosion resistant materials for the
condensate drain lines such as PVC pipe or
plastic hose.
• The condensate drain pipe (along its entire
length) must be at least the same diameter as
the drain line, (1/2 inch NPT).
• The end of the condensate drain pipe should
be open to the atmosphere. The end should
not be under water or other substances.
• To minimize freezing of the condensate, run
the condensate drain line through an interior
wall or between insulation and an interior wall.
• Ensure that condensate drain, PRV, and T&P
relief valve are piped separately to their own
dedicated drain lines.
• Dispose of condensate per local codes.
INFORMATION
• Water heaters have an integrated condensate
collector.
• The condensate drain pipe should be as short
as possible and have a downward pitch.
• If the condensate drain gets blocked, a
diagnostic code will display on the controller. If
this occurs, the condensate drain must be
cleaned.
• The condensate trap will automatically prime
(self-prime) during operation of the unit as
condensate forms. Condensate draining from
the unit indicates that the trap is full and that
there is no blockage in the condensate drain. It
is not necessary to add water to the
condensate trap.
• A condensate neutralizer kit (Part Number:
804000074) is available from Rinnai. The kit
allows condensate to flow through neutralizing
media that raises the pH of the condensate to
a level that will help prevent corrosion of the
drain and public sewer system.
DO NOT
• DO NOT connect the condensate drain line
with an air conditioning evaporator coil drain.
• Water heaters have an integrated
condensate trap. DO NOT install an external
condensate trap.
EXTERNAL TRAP
NOT REQUIRED
Demand Duo
H-Series with SENSEI CX Installation Instructions
A condensate line must be installed to the 1/2 in.
PVC elbow located at the left side of the lower
enclosure.
Condensate line must pitch toward the drain.
Air gap must be installed on the condensate line
to enable the condensate to drain.
•
The end of the condensate drain pipe should
be open to the atmosphere. The end should
not be under water or other substances.
CORRECT
Pipe open to
atmosphere
Water
Level
Figure 42
NOT
CORRECT
Pipe submerged
in water
Water
Level
Condensate
Drain
(1/2 in. PVC)
39
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