4. Design IV – Diagrams with information distributed hour by hour
The controller displays diagrams with information about the electrical heater's and heating
installation pump's performance. This is implemented with a full screen histogram. On the
horizontal axis of the coordinate system are the hours and on the vertical axis is the maximum
possible value for an hour in percentage. On the top of the screen is the date for the displayed
information and the bottom left field shows the summary information for the whole day.
This information remains on the screen for 30 seconds. After that the display goes back to its
previous view. Press the F button to see the next diagram.
Operation with NHC-H42
An easy and intuitive software manages the controller. It is specially designed to automatize the
water heater's control, so you don't have to take care for the hot water.
When the water heater is on, it chooses the best heat source. With major priority are the solar
collector and the boiler. If the differential temperatures
∆
t1
and
∆
t2
are above the limits, set from the
menu
Dif Temp 1 / 2
line
Pump On
, the relevant circulation pump turns on to transfer the heat to
the water heater. The differential temperatures are calculated as follows:
•
∆
t1 = t3 – t5
– for the solar installation
•
∆
t2 = t4 – t2
– for the boiler installation.
When the pumps are on and the differential temperatures
∆
t1
and
∆
t2
go below the limits, set
from the menu
Dif Temp 1 / 2
line
Pump Off
, the relevant circulation pump turns off.
To help the outer heat sources when their heat energy is not enough, the water heater could use
its electrical heater. Its work is controlled by a method which main purpose is to use the electricity
only when no other heat sources are available. This way, with as low expenses as possible, you can
be sure that you will always have hot water, no matter if your boiler works, or if the sun light is
enough, or if there is any sun light at all.
To restrict the use of the electrical heater, there are two specific solutions in NHC-H42:
•
The heater turns on when the temperature, measured by the middle temperature sensor
(Sensor 5) goes below the set limit, and turns off when the bottom temperature sensor
(Sensor 1) reaches the needed temperature. Because of this, if a small amount of hot water
has been used, the temperature in the bottom section could get lower, but in the middle
section it will still be higher. Meanwhile, if the solar installation works, it will continue
heating the water up and the electrical heater might not be used at all.
•
Beside the temperature that should be reached while using electricity, there is a temperature
NHC-H42-2 Reference Manual ver 1.6
стр. 6 / 18
A diagram for
the measured parameter
Summarized information
about the measured parameter
Hours of the day: 00-23
% of the maximum possible
value for one hour
