Rinnai REU-N2024FF-US, Installation And Operation Manual

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Rinnai Tankless Water Heater Installation and Operation Manual 57
While any hot water is being provided, the temperature setting can only be adjusted between 98° F
and 110° F.
NOTICE
Check local codes for the maximum water temperature setting allowed when used in nursing homes,
schools, day care centers, and all other public applications.
NOTICE
If a newly installed water heater with a controller has not been powered for at least 6 hours then
the temperature will return to the default setting of 104° F (40° C) if power is interrupted.
NOTICE
There may be a variation between the temperature displayed on the temperature controller and the
temperature at the tap due to weather conditions or the length of pipe to the water heater.
NOTICE
DANGER
Water temperatures over 125° F (52° C) can cause severe burns or scalding
resulting in death.
Hot water can cause first degree burns with exposure for as little as:
3 seconds at 140° F (60° C)
20 seconds at 130° F (54° C)
8 minutes at 120° F (49° C)
Children, disabled, or elderly are at highest risk of being scalded.
Feel water before bathing or showering.
This water heater requires a minimum flow rate to operate. This rate can be found on the specification page in this
manual. In some cases when you are not getting hot water or if the water alternates between hot and cold, it is due to
the water flow being below or close to the minimum flow rate. Increasing the flow rate should resolve these problems
in these cases.
If you are experiencing issues with higher temperature settings, then reduce the temperature setting. Selecting a
temperature closer to that which is actually used at the faucet will increase the amount of hot water being delivered to
the faucet, due to less cold water mixing at the fixture.
4.3 Setting the Temperature
1. If the water heater is off, press the “ On/Off ” button to turn on.
2. The “ Priority ” button enables a controller if multiple controllers are being
used. If the “ Priority ” light is off, then press the “ Priority ” button on the
temperature controller. The orange “ Priority ” light will glow indicating that
this controller is controlling the temperature and that the water heater is
ready to supply hot water. The priority can only be changed while no hot
water is running.
3. Press the (Up) or (Down) buttons to obtain the desired
temperature setting.
All hot water sources are able to provide water at this temperature setting
until it is changed again at this or another temperature controller.
The controller buttons shown below are located on the outside front panel for internal (indoor) water heaters.
For external (outdoor) water heaters, open the front panel to access the controller buttons.