Connect Condensate Drain - Rinnai RSC199i 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 tem-
peratures should be wrapped with an
approved supplemental heat source.
Install per manufacturer's instructions.
• Slope the condensate drain lines to-
ward the inside floor drain or conden-
sate 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 56
• For external (outdoor) installations, to
minimize 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 conden-
sate drain, a condensate pump should
be installed.
54
NOT CORRECT
Pipe submerged
in water
Water
Level
Rinnai Tankless Water Heater Installation and Operation Manual
• 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 conden-
sate 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 57
Neutralizer
Refer to neutralizer
Installation Manual
and local codes for
neutralizer installation
guidelines.
Pipe open to
atmosphere