Rinnai RUR98i (REU-KBP3237FFUD-US) Operation and Installation Manual | Page 10
10
KBP Series Manual
Unit clearances
Indoor
model
RUR98i
to Combustibles
inches (mm)
to Non-
Combustibles
inches (mm)
Top of Heater
6 * (152)
2 *(51)
Back of Heater
0 (zero)
0 (zero)
Front of Heater
6 (152)
6 (152)
Sides of Heater
2 (51)
1/2 (13)
Ground/Bottom
12 (305)
12 (305)
Vent
0 (zero)
0 (zero)
* 0 inches from vent components and condensate drain
line.
The clearance for servicing is 24 inches in front of the
water heater.
For closet installation, clearance is 6 inches (152 mm from
the front.
Outdoor
model
RUR98e
to Combustibles
inches (mm)
to Non-
Combustibles
inches (mm)
Top of Heater
12 (305)
2 (51)
Back of Heater
0 (zero)
0 (zero)
Front (panel)
24 (610)
0 (zero)
Front (exhaust)
24 (610)
24 (610)
Sides of Heater
6 (152)
1/8 (3.2)
Ground/Bottom
12 (305)
2 (51)
The clearance for servicing is 24 inches in front of the
water heater.
to side
to front
to top
to floor/ground
Freeze Protection
Make sure that in case of freezing weather the water
heater and its water lines are protected to prevent
freezing. Damage due to freezing is not covered by
the warranty.
Loss of freeze protection may result in water damage
from a burst heat exchanger or water lines.
With electrical power supplied, the water heater will
not freeze when the outside air temperature is as cold
as –22°F (-30°C) for indoor models or is as cold as –4°F
(-20°C) for outdoor models, when protected from
direct wind exposure. Because of the “wind-chill”
effect, any wind or circulation of the air on the unit
will reduce its ability to freeze protect.
The unit may be drained manually. However, it is
highly recommended that:
drain down solenoid valves be purchased and
installed that will automatically drain the unit if
power is lost. These are available in a kit,
104000059. (The condensate trap drain plug,
water drain plug, and pump drain plug are not
affected by the auto drain down solenoid valves
and will have to be manually opened.)
a surge protector with terminals be purchased
and installed which allows the solenoid valves to
operate if the unit is disabled due to a diagnostic
code. This is available as 104000057.
In addition, the solenoid valves should be connected
electrically to a surge protector with terminals. This
allows the solenoid valves to operate if the water
heater is disabled due to a diagnostic code.
The freeze protection features will not prevent the
external piping from freezing. It is recommended that
hot and cold water pipes be insulated. Pipe cover
enclosures may be packed with insulation for added
freeze protection.
It is recommended that the condensate trap drain line
be insulated. A frozen condensate trap drain line
results in diagnostic code 25.
In the event of a power failure at temperatures below
freezing, the water heater should be drained of all
water to prevent freezing damage. In addition, drain
the condensate trap, drain line, and pump drain.
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