Purposes and connection way of the controller NHC-H42
The controller is designed for combined water heaters with up to two heat exchangers and mono-
phase or three-phase electrical heater. The outer and accession dimensions of the controller comply
with the specifications of the water heaters produced by Eldominvest (
www.eldominvest.com
). The
controller has one temperature regulator for an electrical heater and two differential temperature
regulators, adapted for a solar collector installation and a heating installation with a boiler or a
fireplace. The difference in the differential temperature regulators is in the safe modes: the solar
installation needs prevention from overheating and freezing, while the boiler doesn't. The controller
directly controls the circulation pumps of the external installations and turns on the three-phase
electrical heater via three relays.
Connection scheme of NHC-H42 to a three-phase water heater
NHC-H42-2 Reference Manual ver 1.6
стр. 3 / 18
