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5.3 Control Panel 5.3.2 Locking the Controller <br /> The controller panel allows you to adjust the 1. To lock the internal controller, press and hold <br /> water temperature, lock the controller on a set down the "Priority" button. <br /> temperature, and view diagnostic information. 2. While holding down the "Priority" button, <br /> *F/°c o In Use 0 press the A (Up) button until a beep is heard <br /> 0 (approximately 5 seconds). Then, release <br /> both buttons at the same time. <br /> Appm water Temp. <br /> 3. appears in the display indicating the <br /> controller is locked. <br /> 0 a o Priority © NOTE <br /> Eemp7eratiurelto <br /> lashes between and the set <br /> �LI I <br /> Hot water temp <br /> indicate the controller is locked. <br /> © a On/Off 0 <br /> ARCM-,us-w To unlock the controller, follow the above steps. <br /> Figure 71 <br /> Table 34 <br /> 0 Display 'Frc o In Use <br /> © Increases hot water temperature <br /> © Decreases hot water temperature Approx Water Temp. <br /> 0 Indicates the water heater is in use <br /> © Enables controller when multiple - Priority <br /> controllers are used <br /> Ho wa er emp <br /> 0 Turns the water heater on or off - <br /> On/Off <br /> 5.3.1 Setting the Controller to MC-91-,us-w <br /> Mute Figure 73 <br /> To eliminate the beeps when keys are pressed, <br /> press and hold both the A (Up) and V (Down) <br /> buttons at the same time until a beep is heard <br /> (approximately 3 seconds). Then, release both <br /> buttons. <br /> To turn on the beeps, repeat the above steps. <br /> IFI*C a In Use <br /> Approu water Temp. <br /> ao Priority <br /> Hot water temp <br /> UaJ <br /> On/Off <br /> �cai-i us-w <br /> Figure 72 <br /> Rinnai Tankless Water Heater Installation and Operation Manual 73 <br />