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30 Value Series Manual
How to use the Temperature Controller
The MC-91-2 controller is the standard temperature
controller that is supplied with the water heater. On
indoor models it is integrated into the front panel. The
MCC-91-2 controller is for hydronic applicaons requiring
higher temperatures. When the MCC-91-2 controller is
connected, these higher temperatures are available on all
controller models in the system. Refer to the secon on
temperature ranges.
DO NOT repeatedly operate the water heater and then use
a hot water tap while the controller is turned o. Operang
the water heater in this way to alternately produce hot
water may cause water to condense on the outside of
internal parts and accumulate in the water heater cabinet.
Dimensions (inches): 3.5 W x 4.75 H x 0.75 D
Temperature
Display
Priority
Indicator
Priority
Button
ON/OFF
Button
In Use
Indicator
Temperature
Selection
MC-91-2US
Before operang, smell all around the appliance area
for gas. Be sure to smell next to the oor because
some gas is heavier than air and will sele on the
oor.
Keep the area around the appliance clear and free
from combusble materials, gasoline, and other
ammable vapors and liquids.
Always check the water temperature before entering
a shower or bath.
Do not use this appliance if any part has been under
water. Immediately call a licensed professional to
inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
Should overheang occur or the gas supply fail to shut
o, turn o the manual gas control valve to the
appliance.
Do not adjust the DIP switch unless specically
instructed to do so.
Do not use an extension cord or an adapter plug with
this appliance.
Any alteraon to the appliance or its controls can be
dangerous and will void the warranty.
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. Rinnai provides a “Scale Control
System” that oers superior lime scale prevenon and
corrosion control by feeding a blend of control
compounds into the water supply. Damage and repair
due to scale in the heat exchanger is not covered by
warranty.
Keep the air intake locaon free of chemicals such as
chlorine or bleach that produce fumes. These fumes
can damage components and reduce the life of your
appliance. Damage and repair due to corrosive
compounds in the air is not covered by warranty.
WARNING
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