Connect Condensate Drain - Rinnai Sensei CU199i Installation And Operation Manual

4.9 Connect Condensate Drain

4.9. 1 Guidelines
To prevent condensate damage, follow these
guidelines:
• Do not plumb the condensate drain with
the pressure relief valve; both must be
plumbed independently to drain.
• All condensate must drain and be dis-
posed 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 in. MNPT).
• Condensation drain lines installed in areas
that are subject to freezing temperatures
should be wrapped with an approved sup-
plemental heat source. Install per manu-
facturer's instructions.
• Slope the condensate drain lines toward
the inside floor drain or condensate pump.
• 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 59
• For external (outdoor) installations, to min-
imize freezing of the condensate, run the
condensate drain line through an interior
wall or between insulation and an interior
wall.
• If a floor drain is not available or the drain
is above the level of the condensate drain,
a condensate pump should be installed.
Rinnai Tankless Water Heater Installation and Operation Manual
NOT CORRECT
Pipe submerged
in water
Water
Level
• A condensate neutralizer kit 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. Refer to section "3.6
Accessories" for more information.
• The condensate drain pipe should be as
short as possible and have a downward
pitch.
• The condensate trap will automatically
prime (self-prime) during operation of the
water heater as condensate forms. Con-
densate draining from the water heater
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 con-
densate trap.
• 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.
Pipe open to
atmosphere
Condensate
Pump
Figure 60
Neutralizer
Refer to neutralizer
Installation Manual
and local codes for
neutralizer installation
guidelines.
Pipe open to
atmosphere
58