Rinnai REU-KB3237FFUD-US User Manual

6 KB Series Manual
Consideraon of care for your water heater should
include evaluaon of water quality.





Total Hardness Up to 200 mg / L
Aluminum * Up to 0.2 mg / L
Chlorides * Up to 250 mg / L
Copper * Up to 1.0 mg / L
Iron * Up to 0.3 mg / L
Manganese * Up to 0.05 mg / L
pH * 6.5 to 8.5
TDS (Total Dissolved Solids) * Up to 500 mg / L
Zinc * Up to 5 mg / L

Environment
Air surrounding the water heater, venng, and vent
terminaon(s) is used for combuson and must be
free of any compounds that cause corrosion of
internal components. These include corrosive
compounds that are found in aerosol sprays,
detergents, bleaches, cleaning solvents, oil based
paints/ varnishes, and refrigerants. The air in beauty
shops, dry cleaning stores, photo processing labs, and
storage areas for pool supplies oen contains these
compounds. Therefore it is recommended that
outdoor models be used for these locaons where
possible.
The water heater, venng, and vent terminaon(s)
should not be installed in any areas where the air may
contain these corrosive compounds. If it is necessary
for a water heater to be located in areas which may
contain corrosive compounds, the following
instrucons are strongly recommended.

Indoor/Internal Water Heaters
 DO NOT Install in areas where air for combuson
can be contaminated with chemicals.
 Before installaon, consider where air has the
ability to travel within the building to the water
heater.
 Where possible, install the water heater in a
sealed closet so that it is protected from the
potenal of contaminated indoor air.
 Chemicals that are corrosive in nature should not
be stored or used near the water heater.
Outdoor/External Water Heaters and Vent
Terminaons of Indoor/Internal Water Heaters
 Install the water heater as far away as possible
from exhaust vent hoods.
 Install as far away as possible from air inlet
vents. Corrosive fumes may be released through
these vents when air is not being brought in
through them.
 Chemicals that are corrosive in nature should not
be stored or used near the water heater or vent
terminaon.
Damage and repair due to corrosive compounds in
the air is not covered by warranty.
Water Quality
* Source: Part 143 Naonal Secondary Drinking Water
Regulaons
If you install this water heater in an area that is
known to have hard water or that causes scale build-
up the water must be treated and/or the heat
exchanger ushed regularly.
When scale build-up in the heat exchanger begins to
aect the performance of the water heater, a
diagnosc code “LC#” will display. Flush the heat
exchanger to prevent damage to it. Scale build up is
caused by hard water set at a high temperature.
Rinnai oers Southeastern Filtraon’s Scale Cuer
Water Condioning System” that oers superior lime
scale prevenon and corrosion control by feeding a
blend of control compounds into the cold water
supply.
You must ensure that clearances will be met and that
the vent length will be within required limits.
Consider the installaon environment, water quality,
and need for freeze protecon. Requirements for the
gas line, water lines, electrical connecon, and
condensate disposal can be found in their respecve
installaon secons of this manual.
Part Number Descripon
103000038
Southeastern Filtratrion
ScaleCuer System 3/4” Feed
103000039
ScaleCuer Rell

Rinnai REU-KB3237FFUD-US Specifications

General

Brand	Rinnai
Model	REU-KB3237FFUD-US
Category	Water Heater
Language	English