All of the necessary temperature sensors connect to the controller: three of them measure the
temperature of the water in the water heater, one in the solar collector and one in the boiler. The
temperature sensors should be mounted as described in table 1.
Table 1
Temperature
sensor
Temperature
Mounting
Sensor 1
t1
In the bottom section of the water heater, beside the electrical heater
Sensor 2
t2
In the upper section of the water heater, above the boiler's serpentine
Sensor 3
t3
pt1000 – in the solar collector
Sensor 4
t4
NTC – in the boiler
Sensor 5
t5
In the middle section of the water heater, above the solar collector's
serpentine
If you want to remotely monitor and control your water heater's performance through your
computer, you can connect a radio modem NRM-868 to the controller to build a wireless network.
Information displayed on the main screen
The display has four main screen designs. They show different screen view for the main work
conditions of NHC-H42: Water Heater Off, Water Heater On, Settings and Graphics
1. Design I – Water Heater Off
When the water heater is off, the screen displays date, time, the current temperature of the water,
measured on the top section of the water heater, and the condition of the tank's anode protector. If
there is an error, the anode protector's indicator switches with the error message and there might be
a sound alarm too. When the water heater is off, the screen is darker.
If the time is not set, the clock blinks. The temperature regulator has a battery that keeps the time
settings if the mains power supply is off for short time. The battery keeps the time settings for
maximum 18 hours, after that the clock turns off and needs to be set again.
NHC-H42-2 Reference Manual ver 1.6
стр. 4 / 18
System date
System time
Temperature of the water
in the top section of the
water heater
The anode protector's
condition or an error
message, if any
