Setting Controller To Mute; Locking The Controller - Rinnai RUCS65i Manuel D'installation Et D'utilisation

Temperatures Available with a Controller
The water heater can deliver water at only one temperature setting at a time. The available temperatures are
provided below. A temperature lower than 120° F (49° C) can be obtained at the tap by mixing with cold water.
To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the "On/Off" button
for 5 seconds while the water heater is OFF.

Setting Controller to Mute

On the MC-91-2 to eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both
the up and down buttons until a beep is heard (approximately 5 seconds).

Locking the Controller

The MC-91-2 controller can be locked by pressing the Priority button and the up button together for 5 seconds.
A beep will sound confirming that the controller is locked. The display will alternately show "LOC", the
temperature setting, and a diagnostic code if one has been activated. All of the controllers in the system are
also locked.
To unlock the controller press the Priority button and the up button together for 5 seconds.
Temperature Settings Available
Fahrenheit °F 120 125 130 135 140
Celsius °C 49
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