OPERATION
Cleaning, care and maintenance
EN
GL
ISH
www.stiebel-eltron-usa.com
DHX 15 Select |
9
Temperature units parameter setting
The DHX Select is capable of displaying temperature in either Fahr-
enheit or Celsius.
The current unit will be shown and the display will be flashing to
indicate that the value can be changed. Rotate the control knob to
change the value between Fahrenheit and Celsius.
Pressing the T
max
button once while at this display will move the
display onto the display-lock parameter setting.
Display-lock parameter setting
The display can be locked to prevent changes to the temperature set-
point. This menu will flash, indicating that the value can be changed
by rotating the control knob. While the display shows “Off”, the lock
is not active. The lock is active when it reads “On”.
If the display-lock parameter is set to “On” and the user either holds
the T
max
button for 5 seconds or lets the display time out for 15
seconds, the display-lock will become active.
If the display-lock is active, a lock symbol will appear on the base
display, and no parameters can be changed. In order to disable the
lock, hold the T
max
button for 12 seconds. The lock will disappear
from the display and all parameters can be changed again.
Pressing the T
max
button once while at the display-lock parameter
setting menu will move the display back onto T
max
parameter setting
menu.
5.3.3 Returning to the base display
While navigating the display and on any menu other than the base
display, holding the T
max
button for 5 seconds will return the display
to the base display. Additionally, the display will revert to the base
display after a 15-second period with no user input.
5.4 Recommended
settings
Your electric tankless water heater offers maximum precision and
convenience for DHW production. Should you nonetheless operate
the water heater with a thermostatic valve, we recommend that you:
f
Adjust the set temperature on the water heater to over 122 °F
(50 °C). Then set the required set temperature on the thermo-
static valve.
Saving energy
The following recommended settings will result in the lowest energy
consumption:
- 100 °F (38 °C) for hand washbasins, showers, bath
- 131 °F (55 °C) for kitchen sinks
Internal anti-scalding protection (qualified contractors)
If required, the qualified contractor can set a permanent tempera-
ture limit, for example in nurseries, hospitals, etc., see section 12.1,
“Internal anti-scalding protection via jumper slot”, pg. 14.
Recommended setting for operation with a thermostatic valve
and water preheated by solar energy
f
Set the temperature at the water heater to the maximum
temperature.
Following an interruption to the water supply
!
Material losses
To ensure that the Direct Coil
™
heating system is not dam-
aged following an interruption to the water supply, the
water heater must be restarted by taking the following
steps:
f
Check the supply pressure. The reading on the gauge
should read more than 26.1 psi, but not more than
145 psi.
f
Disconnect the water heater from the power supply by
turning off the connected circuit breaker.
f
Open and close all connected draw-off valves at least 5
times, for at least 3 minutes total, until all air has been
purged from the pipework and the water heater.
f
Switch the power back at the circuit breaker back ON.
6. Cleaning, care and maintenance
f
Never use abrasive or corrosive cleaning agents. A damp cloth
is sufficient for cleaning the water heater.
f
Check the taps regularly. Limescale deposits at the tap outlets
can be removed using commercially available descaling agents.
