Installation Sheet

48 Rinnai Tankless Water Heater Installaon and Operaon Manual
CORRECT
Pipe open to
atmosphere
Pipe submerged
in water
NOT
CORRECT
Water
Level
Water
Level
• Do not plumb the condensate drain with the
pressure relief valve; both must be plumbed
independently to drain.
• 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 plasc
hose.
• The condensate drain pipe (along its enre length)
must be at least the same diameter as the drain line
(1/2 in. MNPT).
• Condensaon drain lines installed in areas that are
subject to freezing temperatures should be wrapped
with an approved supplemental heat source. Install
per manufacturer’s instrucons.
• Slope the condensate drain lines toward the inside
oor 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.
• For external (outdoor) installaons, to minimize
freezing of the condensate, run the condensate
drain line through an interior wall or between
insulaon and an interior wall.
• If a oor drain is not available or the drain is above
the level of the condensate drain, a condensate
pump should be installed.
• A condensate neutralizer kit is available from Rinnai.
The kit allows condensate to ow 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 secon “2.4 Accessories” for more
informaon.
• The condensate drain pipe should be as short as
possible and have a downward pitch.
• The condensate trap will automacally prime (self-
prime) during operaon of the water heater as
condensate forms. Condensate 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 condensate trap.
3.9 Condensate
Pipe open to
atmosphere
Neutralizer
Refer to neutralizer
Installaon Manual and
local codes for neutralizer
installaon guidelines.
Condensate
Pump
Pipe open to
atmosphere
EXTERNAL TRAP
NOT REQUIRED
DO NOT
• DO NOT connect the condensate drain line
with an air condioning evaporator coil drain.
• Water heaters have an integrated condensate
trap. DO NOT install an external condensate
trap.
Condensate Guidelines
To prevent condensate damage, follow these guidelines: