Operating The Water Heater; Turning The Water Heater On Or Off; Adjusting The Water Temperature - Navien NPE Installation & Operation Manual

6. Operating the Water Heater

WARNING
Follow the instructions below to avoid unsafe operating
conditions that could cause property damage, severe personal
injury, or death.
Ensure that the water heater is filled with water before
turning on the water heater.
If overheating occurs or the gas supply fails to shut off, shut
off the gas supply to the water heater at the manual gas
valve.
If any part of the water heater has been submerged in water,
do not use this appliance and immediately call a qualified
service technician. The water heater must be replaced.

6.1 Turning the Water Heater On or Off

To turn the water heater on or off, press the Power button.
When the power is on, the temperature will appear on the front
panel display.

6.2 Adjusting the Water Temperature

WARNING
Before adjusting the water temperature, read "To prevent
burns:" on page 5 carefully. Water above 120 °F can cause
instant scalding, severe burns, or death.
The water heater is set to 120 °F (49 °C) by default. To adjust the
water temperature:
1. Make sure that all hot water faucets are closed, and ensure that
the internal circulator and any external circulating pumps are
off.
If a hot water faucet is open, you can adjust the
Note
temperature only from 98-110 °F (37-43 °C).
2. Press the Up [+] or Down [-] button until the desired
temperature appears on the display. You can adjust the
temperature while the display is flashing. Once the display
stops flashing, the temperature setting is stored.
The water heater will retain your settings during a
Note
power outage.
You can adjust the temperature by the below 10-degree
increments, depending on the temperature range:
Temperature range
98 °F-120 °F (Fahrenheit mode)
36 °C-50 °C (Celsius mode)
120 °F-140 °F (Fahrenheit
mode)
50 °C-60 °C (Celsius mode)
The water heater will not provide hot water instantly at the hot
water faucet unless a recirculation line has been installed from the
furthest fixture back to the water heater. For "A" models, the unit
must be set to "external recirculation" mode.
Adjusting the water
temperature
1 °F or 0.5 °C increments
Press for 2 seconds to adjust in
5 °F or 2 °C increments
Operating the Water Heater 63