Rinnai Tankless Water Heater Installation and Operation Manual
29
4.5.7 Condensate
(Indoor models only)
Condensate can form in the vent of high efficiency
direct vent appliances. Without proper drainage,
condensate will damage the heat exchanger.
To prevent condensate damage, follow these
instructions.
DO NOT
•
DO NOT allow condensate to enter the
water heater.
•
DO NOT connect the condensate drain
pipe directly to the rain sewer.
•
DO NOT connect the condensate drain
line with an air conditioning evaporator coil
drain or.
•
DO NOT connect the condensate drain
line to the pressure relief valve/line of the
appliance.
Must Do
•
Use only venting that is approved and
identified as acceptable for your
particular model.
•
For vertical terminations, use the inte
-
grated condensate collector and install a
condensate trap.
•
Slope the venting toward the appliance ac
-
cording to the vent manufacturer’s installa
-
tion 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, (5/8 inch).
•
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.
•
The condensate collector should be used
for all combination domestic/
hydronic heating applications.
Information
•
A condensate trap is available (part num
-
ber 222053).
•
Regions of cold climate will create more
condensate in the vent system. The con
-
densate collector should be used in cold
climates.
•
The condensate drain pipe should be as
short as possible and have a downward
pitch.
To adjust the condensate collector position:
Loosen the 4 screws at the rear bracket
1. Slide the bracket away from the female vent
top.
2. Remove the 4 screws attaching the female
vent top to the water heater.
3. Lift up the female vent top and reposition as
desired.
4. Install the 4 screws at the vent top and tighten
the 4 screws at the bracket.
5. Secure the first vent component to the water
heater with one self-tapping screw at the hole
located above the condensate collector.
Securing
Screw
Figure 25
Vertical Termination
(Condensate collector must be used in all
installations)
Figure 24
3 in. (75 mm)
minimum
3 in. (75 mm)
minimum
