second one is for a boiler. The three built-in temperature regulators in one controller successfully
combine all the advantages of the different heat sources. Some of them are free and others are
always available. For example, if the sun hasn't been strong enough during the day, you can set up
the controller to use the electrical heater, so you will have hot water whenever you need it.
The controller's compact size allows it to be built-in in the water heater. This solution makes
the building of the external heating installations easier. All of the needed temperature sensors and
circulation pumps are directly plugged in to NHC-H42. No additional electrical boards and
complicate wiring are necessary. The information, displayed on the screen is clear and very useful.
Specific advantages of the temperature regulator NHC-H42:
•
New automatized software with less menus and easier parameters input. Work modes are
simplified, because the controller decides which heat source is best to be used.
•
An option for a connection with a RF modem NRM-868/v5 for data transfer to a remote
monitoring and control system.
•
Measures and displays the temperature of the water in the water heater at three points at the
same time: in the bottom section (beside the heater), in the middle (over the solar collector's
heat exchanger) and in the top (over the boiler's heat exchanger).
•
Automatically turns on a work mode that prevents the overheating of the solar collector.
•
Uses energy from the electrical heater if the temperature of the hot water, heated by the solar
collector is not high enough.
•
Automatically uses energy from a boiler or a fireplace installation, if their temperature is
high enough.
•
Automatically takes off the heat from the water heater to prevent the solar collector's
overheating on the next day.
•
Prevents the freezing of the water heater or of the solar collector.
•
Information about the condition of the anode protector.
•
Information if higher than 30mA leakage from the electrical heater to the hull occurs and
automatically turns off the water heater when such a leakage is registered.
•
Diagnostics of all used circuits.
•
Three timers to set up to three intervals per day when more intensive work of the electrical
heater is allowed
•
System time and date. Knowing what time it is while you are in the bathroom is really
convenient.
•
Measures the consumed electricity in kWh and shows it in a digital view for two rates.
•
Graphic view hour by hour for the current and the previous day with information about the
consumed electricity and the work time of the boiler's and the solar collector's circulation
pumps.
•
Monitors the condition of the heater and shows a message if the water is not heated up for
the presumed time.
•
An option for a connection with an UPS so the circulation pumps and the controller could
keep working if a failure in the mains power supply occurs.
•
Two work modes for the boiler's circulation pump – CH Priority and DHW Priority. This is
an advantage if there is only one circulation pump in the building's heating installation and it
transfers the water from the boiler both to the water heater and to the heating radiators. In
this case, if no hot water has been consumed and the differential temperature goes below the
set limit, the circulation pump will stop transferring water not only to the water heater, but to
the heating installation, too. This means that the building is going to be heated only if there
is a consumption of hot water from the water heater. To avoid this inconvenience, CH
Priority mode might be used. Thus, the circulation pump's turnings on and off depend only
on the boiler's temperature. On this mode, if the boiler is hot enough, the building is heated,
regardless of the water heater's temperature.
NHC-H42-2 Reference Manual ver 1.6
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