14
When air is introduced into the plumbing system, follow the steps below to ensure the unit can
safely resume operation.
1. Shut off all power to the unit at the circuit breaker on the main electrical panel.
2. Perform the maintenance or servicing tasks.
3. Open one or more hot water faucets and allow water to run through the unit for several
minutes to purge any air from the heater and water lines
This step must be performed before turning on power to the heater. Failure to complete
this step may cause permanent damage to the heating elements.
4. Reconnect power to the unit at the circuit breaker on the main electrical panel.
5. With water running through the unit, check the temperature and adjust by turning the knob.
The recommended temperature setting is 118°F (48°C).
12. User Interface/Controls
Power
• Turn the knob to the right (clockwise) to activate the heater.
The display will light up.
• Turn the knob all the way to the left (counterclockwise) to turn
off the heater.
Setting the Output Water Temperature
• To set the temperature, turn on a hot water faucet and allow
water to run through the heater. Turn the knob clockwise to
activate the heater and display the outlet temperature.
• To raise the temperature setting, turn the knob clockwise. To lower the temperature, turn the
know counterclockwise.
• The temperature can be set to a level from 90°F to 122°F (30°C to 50°C).
• A comfortable temperature for bathing and showering is between 98°F and 105°F (37°C to
41°C).
• The recommended temperature setting is 118°F (48°C), which will deliver hot water for all
household needs at a maximum water flow rate.
CAUTION:
A higher temperature setting is not recommended, as it can cause severe
scalding injuries to children and elderly persons. Higher temperatures also produce more
scale buildup in water heating devices.
115
º
F
Lower
temperature
Raise
temperature
Summary of Contents for AT-910-18TP
Page 20: ...Notes P N 196183J ...
