Naturela NHC-H42-2 User Manual - page 8
higher than the limit set in the menu
EL Eco Settings,
line
Heater Off.
•
if the electrical heater is off, because the temperature in the middle section of the
water heater is above the set temperature in
Heater On,
pressing and holding the
button
▲
for more than 2 seconds turns the heater on. It turns off when the the
Heater Off
conditions are implemented.
•
if there is a time interval, activated from the menu
EL Boost Timer,
the heater turns
on in this interval if the temperature, measured by
t1
is lower than the set temperature
in the menu
EL Eco Settings,
line
Heater Off – 5 degrees.
In this case, the water heater
turns on sooner, because the turning on temperature might get higher than the set
temperature in
Heater Off
and
moreover, it is measured in the bottom section of the
water heater, where the water gets cooler easier.
When a time interval is activated, in the field Information about the heater's work is
displayed the upcoming action (ON/OFF) and the time for it.
When the electrical heater is on, there are animated moving bubbles above its icon on the
screen and the controller's red LED is on, too.
If the electrical heater hasn't been activated from the menu
System Setting
, in the field
Information about the heater's work appears an
OFF sign
.
If only the electrical heater is activated from the menu
System Setting,
its turning on and
off depends on the temperature in the bottom section of the water heater, measured by
Sensor 1.
When changing the differential temperatures for turning the circulation pumps on and off, it is good
to have in mind the following:
•
Pump Off is good to be greater than 3 degrees, because if the difference is smaller, the
pump would work for too long, since the heat exchangers start giving out their heat less
effectively. Besides, there might be some losses and temperature decreasing from the
sensor's spot in the solar collector to the water heater, which additionally decreases the
differential with the heat exchanger.
•
Pump On should have to recoup the heat losses between the solar collector and the heat
exchanger, and has to be enough greater than Pump Off.
When using energy from the solar installation, the temperature restriction for heating up the water
heater is up to 88 degrees, measured by Sensor 1. When using energy from the boiler, the restriction
for heating up the water heater is up to 85 degrees, measured by Sensor 2. After this limit the
circulation pumps turn off and stop transferring heat to the water heater.
Turning the water heater off
When the water heater is on and the screen has the Design II view, pressing the F (On/Off/Set)
button turns the water heater off, the screen's brightness gets decreased and the screen gets the
NHC-H42-2 Reference Manual ver 1.6
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