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TECHNICAL DESCRIPTION
MANUAL FOR OPERATION AND POWER CONNECTION
of
ELECTRONIC THERMOSTAT
NHC-H52M-1S / NHC-H52M-2
for control of utility storage water heaters with electric heater/s to 3 kW, 230 V~, single phase
connection, designed for wall mounting
On-Off/ Back
▲/ Temperature setting
▼/ Menu
Confirm (Enter) / Information
WARNING! Read carefully this manual before using the device!
The present instruction is an integral part of the general installation and operation
instruction attached to your water heater unit. All of the general instruction requirements
concerning the water heater installation and connection to the water supply and electricity
networks are absolutely in force. It is compulsory to follow the requirements listed in the
general instruction other sections.
This manual explains the features and usage of the electronic control unit, which replaces
the traditional thermostat and LED switch of the ordinary water heaters.
NHC-H52M / v220322
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Summary of Contents for Eldom Invest NHC-H52M-1S
- Page 1 TECHNICAL DESCRIPTION MANUAL FOR OPERATION AND POWER CONNECTION ELECTRONIC THERMOSTAT NHC-H52M-1S / NHC-H52M-2 for control of utility storage water heaters with electric heater/s to 3 kW, 230 V~, single phase connection, designed for wall mounting On-Off/ Back ▲/ Temperature setting ▼/ Menu...
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Page 2: Technical Description
Depending on your selected water heater the electronic unit can be of a model and features as listed in Table 1. The technical data are listed in Table 2. Table 1 - Models and features of the electronic units NHC-H52M-1S NHC-H52M-2 Thermostat control of the utility storage water electric heater / heaters. - Page 3 Two modes of boiler circulating pump - „CH Priority" and „DHW Priority“ If the installation for heating the building has only one circulating pump that drives water not only from the boiler to the water heater but also to the entire heating system, and then you need to use the CH Priority mode.
- Page 4 Temperature measurement accuracy 1% + +/-1 о Temperature measurement units degrees Celsius 95-255V АС 50/60Нz Voltage output: „Circulation pump 1“ and „Circulation pump 2“ outputs switching on when passing through 0V. Maximum permissible current through the outputs: 0.9А АС „Circulation pump 1“ and „Circulation pump 2“ Maximum permissible power for each connected to 150W the thermostat circulating pump...
- Page 5 The water heaters models electric circuit schema are shown on Fig. 1 and Fig. 2, the number indications are provided in Table 3. 2.1 Connecting to UPS The manufacturer has installed the tank so that it will work without an UPS device. In case of necessity to supply power with an UPS device, it is necessary to use the column terminal labeled 2 in Fig.
- Page 6 B1 (or N), and the protective - to the protective terminal (screw or pin) of the flange clamp marked for protective grounding. Fig. 1 Single-phase connection of water heaters with one heat exchanger NHC-H52M-1S...
- Page 7 Fig. 2 Single-phase connection of water heaters with two heat exchangers NHC-H52M-2 3. DISPLAYS. SETTINGS. MENUS 3.1 Main display - graphics and indications - Fig. 3...
- Page 8 Fig. 3 - Display for electronic units NHC-H52M-1S / NHC-H52M-2 IMPORTANT! The temperature indications are listed in Table 3 3.2 Settings of all operating parameters To select the required settings menu you have to press the button "down" while in the main screen of the unit.
- Page 9 date. If you change the hour and minute and then exit this menu, the seconds will automatically reset. When changing only the date, the seconds are not reset. 3.4 Language selection for menus By pressing the arrow "up" or "down" you can scroll through lines for selection of languages. Press the Enter key to select the highlighted with red tape language and exit from the choice of language.
- Page 10 The heater will turn on when the temperature measured by the sensor set for inclusion in the menu „EL Heating Settings“ falls below the value of the parameter „Heater On Temp.“ of the same menu. It will switch off when the temperature measured by the thermo-sensor t1 (at the bottom of the water heater) reaches the temperature set.
- Page 11 When using the heat from the solar system, the limitation of the temperature to which the water heater will be heated is 85 degrees measured from the sensor 5 (t5). When using the heat from the boiler, the restriction on the temperature to which the heater will be heated is 80 degrees measured from the sensor 2 (t2).
- Page 12 3.7 Changing the set temperature when working with electrical heater. From the main screen, press „up“ to enter the fast mode to change the temperature set menu „EL Set Temperature“. Next pressing of the arrows „up“ or „down“ changes the value. If one of the buttons „up“ or „down“ remains pressed more than 0.8 sec., the value of the set temperature starts automatically to increase or decrease accordingly at a rate of 4 units per second.
- Page 13 Temperature settings for switching on and off the pumps of the solar collector and / or boiler. The parameters are as follows: Solar ∆t1 (NHC-H52M-1S / NHC-H52M-2) The differential temperature between the solar collector and the water heater for switching on and off of the pump. In case of temperature difference over the value in the column "On"...
- Page 14 3.13 Solar protection Setup Menu protection regimes of the solar system. Settings parameters: Auto Holiday mode (NHC-H52M-1S / NHC-H52M-2) When this field is checked automatic start mode for discharging heat from the water heater at night is allowed - "Holiday" Thanks to this discharge the solar system will be...
- Page 15 switch on the electric heater to heat the water to 70 degrees. This is done in order to prevent the development of "legionella" bacteria in the water container. The electric heater shall switch on when night electricity tariff is active. From this menu you can run test pumps for both installations by fields "Solar"...
- Page 16 electric heater it warms the water in the tank to avoid freezing while the solar pump (Freezing discharges the heat from the water heater, in order to protect the solar collector as protection) well. Prevents eventual overheating of the solar collector. If the solar collector thermo- Solar protection sensor (t3) is not operating (not working), the solar pump shall be turned on constantly to avoid any possible overheating.
- Page 17 Failure of the middle thermal sensor of the water heater (t5). It may be either Disconnected S5 interrupted/disconnected or switched off. in short-circuit Failure of the middle thermal sensor of the water heater (t5). It is in short-circuit. When switching on the power the water in the water heater has negative Frozen boiler temperature and may be frozen.
- Page 18 4.4 Data displays Statistics by the hours – By pressing the button Confirm (Enter), when the thermostat is in „Main display“ you may proceed to consideration of the additional data screens. First you shall see displayed the graphics of consumed power and the work of pumps for the last three days. You may scroll these graphics with the arrow keys „up“...
- Page 19 „Anti-frost temp.“. This function may be switched off from the same menu line „Solar anti-frost“. • Protection from freezing of the water tank (NHC-H52M-1S / NHC-H52M-2). The electric heater is activated if the temperature in the water tank falls below 3 degrees. •...
- Page 20 50 degrees. • Automatically activated Holiday mode (NHC-H52M-1S / NHC-H52M-2). Serves to discharge the accumulated heat in the water tank. This option is activated by marking from the menu „Solar protection“, line „Auto Holiday mode“. If after 21 o'clock the...
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