Eldom Invest NHC-H52M-1S Parts list manual

TECHNICAL DESCRIPTION
MANUAL FOR OPERATION AND POWER CONNECTION
of
ELECTRONIC THERMOSTAT
NHC-H52M-1S / NHC-H52M-2
for control of ut l ty storage water heaters w th electr c heater/s to 3 kW, 230 V~, s ngle phase
connect on, des gned for wall mount ng
WARNING! Read carefully th s manual before us ng the dev ce!
The present nstruct on s an ntegral part of the general nstallat on and operat on
nstruct on attached to your water heater un t. All of the general nstruct on requ rements
concern ng the water heater nstallat on and connect on to the water supply and electr c ty
networks are absolutely n force. It s compulsory to follow the requ rements l sted n the
general nstruct on other sect ons.
Th s manual expla ns the features and usage of the electron c control un t, wh ch replaces
the trad t onal thermostat and LED sw tch of the ord nary water heaters.
NHC-H52M / v220322
Confirm (Enter) / Information
▼/ Menu
▲/ Temperature settin
On-Off/ Back

WARNING! This appliance may be used by children of a e over 3 years old and
persons with reduced physical, sensory or mental capabilities, or lack of
experience and knowled e, where they are under supervision or instructed about
the safe use of the appliance and understand the dan ers. Children must not be
allowed to play with the unit! It is absolutely forbidden that children undertake
cleanin or servicin of this appliance! Children a ed from 3 to 8 years are only
allowed to operate the tap connected to the water heater.
1. TECHNICAL DESCRIPTION
The electronic thermostat (hereinafter also the electronic unit) is desi ned for the mana ement and
control of hi h class utility stora e water electric heaters. It has a 4 control buttons, raphic color
LCD display, relay / relays to power the heater / heaters, temperature sensors. The software is
provided with an al orithm to automatically reduce electricity costs. The electronic unit main tasks
are to control your water heater heatin process as efficiently as possible and to relieve you of all
worries and concerns about it.
Dependin 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 electron c un ts
NHC-H52M-1S NHC-H52M-2
Thermostat control of the utility stora e water electric heater / heaters.
Control of the utility stora e water electric heater
additional heat source (boiler or solar collector *).
Control of two additional heat source for the utility
stora e water electric heaters (solar collector and
boiler).
Recommendat on: the solar collector is connected to
the bottom coil and the another heatin source - to
the upper one (boiler, fireplace, etc.).
Three probe panel. Two of them are desi ned to
measure the temperature in the tank at different
hei hts and one is for the additional heat source.
Five probe panel. Three of them are desi ned to
measure the temperature in the tank at different
hei hts. Two serve for the additional heat sources.
Automatic ban to switch on the electric heater, if the
water heater is heated enou h.
Overheat protection of the solar collector if the solar collector temperature becomes hi her than 90 ° C, the
solar circulation pump will be switched on re ardless of the set differential temperature. The pump will shut
off only if the water temperature in the water heater exceeds 85 ° C.
Protection from freezin of the solar collector. This protection removes heat from the water heater.
Protection a ainst freezin of the water heater. The electric heater is switched on at a measured water
temperature below 3 ° C.
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Two modes of boiler circulatin pump - „CH Pr or ty"
and „DHW Pr or ty“ If the installation for heatin the
buildin has only one circulatin pump that drives
water not only from the boiler to the water heater but
also to the entire heatin system, and then you need
to use the CH Priority mode. In such case, in order to
activate the pump the boiler must be sufficiently hot. If
you have separate pumps for the boiler and the
heatin system, you should use the DHW Priority
mode. Then the pump will turn on only if there is
necessary temperature difference between the boiler
and the water heater.
Automatic switch to mode Anti-Le ionella if the water heater has not been heated for seven days to a
temperature above 70°C
Capacity for backup power by UPS device.
Automatic dischar e system extractin heat from the water heater at ni ht to prevent the heat source (solar
collector) from overheatin the next day, if you are away from home lon er and not usin enou h hot water.
Timers to setup intervals of four hours for intense heat by the electric heater. Each interval can be set in any
day of the week to switch on and to what temperature water can be heated.
Control of the solar collector circulation pump power dependin on the temperature difference between the
collector and the water heater.
Selection option which thermal sensor can switch on the electric heater: The one that is down near the heater
or the one in the middle of the water heater.
Prevention of freezin for the water heater and the solar collector.
Audible alarm.
Dia nosis of all thermo-sensors and display an alarm for failure.
Supports system time with date and hour.
Ability to account for consumption in kWh in di ital form separately for two tariff plans.
Charts distributed by hours for the past three days providin information on electricity use in kWh and the
boiler and/or solar collectors circulation pumps.
Monitorin the heater condition and displays a messa e if the water is not heated.
* For water heaters with one coil (lower) the electronic unit is factory confi ured with what additional heat
source it may operate: solar collector or boiler.
Table 2 - Techn cal data of the electron c un ts
Power supply volta e 95-255V АС 50/60Нz
Consumption in Standby mode from 0.8 to 1.5W dependin of display bri htness.
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Temperature measurement accuracy 1% + +/-1о
Temperature measurement units de rees Celsius
Volta e output: „Circulation pump 1“ and „Circulation
pump 2“
95-255V АС 50/60Нz
outputs switchin on when passin throu h 0V.
Maximum permissible current throu h the outputs:
„Circulation pump 1“ and „Circulation pump 2“ 0.9А АС
Maximum permissible power for each connected to
the thermostat circulatin pump 150W
Maximum permissible current throu h the contacts of
each relay 16А АС at 230V
Permissible ambient air temperature when workin
with switched on relays for three-phase electric heater -10 to +65оС
Maximum dimensions 120x60x55
2. WATER HEATER CONNECTION TO THE POWER SUPPLY NETWORK
Only qual f ed persons are ent tled to connect the water heater to the ma ns and to check ts
funct onal ty!
WARNING! Do not proceed to connect the water heater to the power supply network unless you
have made sure that its water tank is full with water! CHECK!
The accumulatin water heaters have an electrocution de ree of protection Class I.
The electric power supply of the water heaters should be performed by a separate current circuit of
insulated three-core supply cable with a cross-section of each of the wires of 2,5 mm 2 (phase,
neutral and earthin ). If the built into the wall cable is a two-wire cable it shall be necessary a
competent and qualified person to pass an additional protective conductor that never should be
interrupted and / or connected on the layout from the electric panel to the tank. Otherwise the
appliance shall not be correctly earthed and it shall reduce its safety!
IT IS COMPULSORY to insert in each phase line a 16А fuse when the heater is 3 kW
WARNING! IT IS COMPULSORY that in the electric circuit feedin the heater is installed such a
device which in the conditions of over volta e cate ory III provides full disconnection of all poles.
The conductors between the circuit and the device incomin electrical terminals must not be
interrupted by any circuit breaker or fuse. If the utility stora e water heater is installed in a premise
with likelihood of splashin water, the switchin on/off unit must be located outside.
WARNING! Failure to comply with the requirements concernin connection to the mains shall
impede the appliance safety, in which it is prohibited to use. Such consequences are not within the
scope of manufacturer or seller warranty liabilities and shall be at the expense of the party, which
has not observed the present manual instructions.
ATTENTION! The connection of the cables from the mains switchboard to the unit terminals shall
be carried out after carefully removin the plastic cover so that the electrical wirin in the unit does
not disen a e.
After connectin and attachin the power cable, put the plastic cover into place and secure it with
screws, takin care for free deployment of electric cables, thermal sensors and the thermostat
capillary tube.
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The water heaters models electric circuit schema are shown on Fi . 1 and Fi . 2, the number
indications are provided in Table 3.
2.1 Connect ng 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 Fi . 1 and Fi . 2 in order to remove the wires (brid es) connectin terminals L to UPS with L
from UPS and N to UPS with N from UPS, indicated by a dotted line. To the terminals thus empties
connect the UPS device. The UPS power cable is connected to the terminals L to UPS (phase) and
N to UPS (zero). The UPS output is connected to the terminals L from UPS (phase) and N from
UPS (zero).
IMPORTANT! It is obli atory to connect correctly the output cable of the UPS to the ri ht terminal in
the unit, i.e. compliance with phase and zero!
When removin the power supply from the UPS device the wires must be reconnected to the
column brid e terminal 2, respectively L to UPS to L from UPS and N to UPS to N from UPS.
ATTENTION! In case of improper connection of UPS or improper recovery of the brid in wires, the
electronic unit will not work and it is very possible to dama e it and increase the risk of electric
shock!
It is necessary to secure the power cord to the power circuit of the water heater and the power cord
from the UPS to the electronic unit a ainst displacement by usin the cable clamp located next to
the hole for the cable in the plastic cap.
Table 3 - Ind cat ons and term nals of the electron c un t components* n F gures 1-2
№ Functions Installation / Purpose
1 Unit power supply
2 UPS terminal
3Thermal sensor NTC 10K,
2m, PVC
It is installed in the middle part of the water heater above the lower heat
exchan er (coil-pipe). Measures the temperature - t5
4Thermal sensor NTC 10K,
0.5m, PVC
It is installed in the lower part of the water heater next to the electric
heater, Measures the temperature - t1
5 Circulation pump 1 Controls circulation pump 1
6 Circulation pump 2 Controls circulation pump 2
7Thermal sensor NTC 10K,
2m, PVC
It is installed in the upper part of the water heater above the top heat
exchan er (coil-pipe). Measures the temperature - t2
8Thermal sensor pt1000,
0.5m, Teflon It is installed in the solar collector. Measures the temperature - t3
9Thermal sensor NTC 10K,
2m, silicone
It is installed in a boiler, fireplace or other. Measures the temperature -
t4.
10 Ma nesium anode Not available in water tanks made of chrome-nickel steel.
11 Heaters
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12 Thermal cut-out
13 Terminal for external wires
14 Serial interface
15 Flan e clamp
* Dependin of your water heater model not all components on the electronic unit may be
available. Please observe the places for sensors installation!
2.2 S ngle-phase connect on of the power supply w res n water heaters des gned for wall
mount ng w th one heat exchanger (F g. 1) and w th two heat exchangers (F g. 2)
The power cord phase conductor connects to the thermal cut-out terminal labeled A1 (or L
dependin on the model), the neutral to the thermal cut-out terminal labeled B1 (or N), and the
protective - to the protective terminal (screw or pin) of the flan e clamp marked for protective
roundin .
F g. 1 S ngle-phase connect on of water heaters w th one heat exchanger NHC-H52M-1S
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F g. 2 S ngle-phase connect on of water heaters w th two heat exchangers NHC-H52M-2
3. DISPLAYS. SETTINGS. MENUS
3.1 Ma n d splay - graph cs and nd cat ons - F g. 3
7

F g. 3 - D splay for electron c un ts NHC-H52M-1S / NHC-H52M-2
IMPORTANT! The temperature indications are listed in Table 3
3.2 Sett ngs of all operat ng parameters
To select the required settin s menu you have to press the button "down" while in the main screen
of the unit. First appears the selection menu - "Sett ngs". By pressin the arrow button "up" or
"down" scroll the lines for selectin sub-menus. With the Enter key you access the marked with
red submenu. If after the last line there is an arrow down or before the first line is up arrow it means
that there are more lines after or before the visible part of the screen. By pressin the arrow up or
down will move the screen up or down, to display next lines.
IMPORTANT! If you do not make any chan es for a lon er period (between 20 seconds and 5
minutes, dependin on the settin s menu) you will automatically exit the selected menu without
savin any chan es made. The only exception is the menu "EL Set Temperature" which shall save
the chan es made! This menu is displayed by pressin "up" from the main screen.
3.3 Sett ng the system date and t me
A blue markin framework is displayed. Usin the arrows
position the frame markin on the parameter you want to
edit. Then by pressin the button Enter a mode to adjust the
parameter is accessed. The blue frame turns red which
indicates that the parameter can be chan ed with the "up"
and "down" arrows. Subsequent pressin of Enter confirms
the parameter chan e and leaves the edit mode. Return to
the previous screen by pressin On-Off / Back
The time is in 23:59 format and the date - dd/mm/yy. The
weekday is obtained automatically after enterin the correct
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date. If you chan e the hour and minute and then exit this menu, the seconds will automatically
reset. When chan in only the date, the seconds are not reset.
3.4 Language select on for menus
By pressin the arrow "up" or "down" you can scroll throu h lines for selection of lan ua es.
Press the Enter key to select the hi hli hted with red tape lan ua e and exit from the choice of
lan ua e.
3.5 Turn On / Off the water heater. Operat ve modes
Press On-Off / Back button. The selection menus shall
appear on the ri ht, Select the action with the arrows
up/down and press Enter to confirm it.
3.5.1 Standby
Electric heater and the boiler pump shall not be switched on.
The solar system continues to operate normally in order to
avoid overheatin the solar collector. The protection modes
continue normal operation: the water tank and solar collector
anti-freeze protection and the protection a ainst overheatin
of the solar collector by automatically switchin to Hol day mode to dischar e the stored ener y.
3.5.2 On
All authorized heat sources shall be switched on (see menu "Heat ng Installat on") if all their
conditions are satisfied for heat dischar e as listed in Table 4
Table 4 - Cond t ons for heat d scharge (operat on)
Installat on
Appl cat on
Descr pt on
Solar collector
NHC-H52М-1S
NHC-H52М-2
∆t1 is the difference between the temperature in the collector (t3) and the temperature in the
middle of the water heater (t5). The solar collector pump shall be switched on if ∆t1 is hi her
than the one set in the menu „Pumps control“, line „Solar ∆t1” , column „On“. The pump
shall work until ∆t1 is lower or equal to the temperature set on the same line but in column
„Off“. When this pump works the circulatin pump on the ima e of the solar installation on the
display will rotate. To protect the water tank from overheatin , the circulation pump of the solar
installation shall switch off when the temperature in the middle sensor turns hi her than 85
de rees!
9

Electric (EL) heater
NHC-H52М-1S
The heater will turn on when the temperature measured by the sensor set for inclusion in the
menu „EL Heat ng Sett ngs“ 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.
If the electric heater is turned off because the water temperature has not dropped below the
temperature in the menu „Heater On Temp.“ and the button „up“ is pressed and held for
more than 2 seconds the water heater shall switch on. It will switch off when the temperature
set at the bottom of the water tank is reached.
If there is a time interval activated in the menu „EL Boost T mers“, then the heater will be
turned on if the temperature t1 of the water measured at the bottom of the water tank is lower
than the temperature set for that hour interval minus 5 de rees. It will turn off when reachin
the temperature set for the same time interval.
NHC-H52М-2
Besides the described workin conditions for the electric heater of electronic units NHC-H52M-
1-1 and NHC-H52M-2-1 it shall switch off and will not work three minutes after the temperature
in the boiler turns hi her than the one set and the boiler pump is runnin .
Boiler
NHC-H52М-2
Mode „Bo ler DHW pr or.“ – ∆t2 is the difference between the temperature of the boiler t4
and temperature at the top of the boiler t2. The boiler circulation pump shall switch on if ∆t2 is
hi her than the one set in the menu „Pumps control“ line „Bo ler DHW pr or. ∆t2“, column
„On“. The pump shall work until ∆t2 is lower than the temperature set on the same line but in
column „Off“ on the same line. When this pump works the circulatin pump on the ima e of
the boiler on the display will rotate. To protect the water tank from overheatin , the circulation
pump of the boiler shall switch off when the temperature in the top sensor (t2) turns hi her
than 80 de rees!
Mode „CH pr or“ – boiler circulatin pump will turn on if the boiler temperature (t4) is hi her
than the temperature set in the menu „Pumps control“, line „CH pr or t4“, in column „On“.
Accordin ly, the pump shall switch off when the temperature t4 falls below the one set for
switch off in the same menu. When this pump works the circulatin pump on the ima e of the
boiler on the display will rotate. To protect the water tank from overheatin , the circulation
pump of the boiler shall switch off when the temperature in the top sensor (t2) turns hi her
than 80 de rees!
When you have enabled a time interval in the field „El heater boost“ on the screen „Informat on“
you can see what action is pendin - Start or Stop, and the time and day of the week when it will
happen.
When selectin the differential temperatures for switchin on and off the circulation pumps it is ood
to keep in mind the followin :
•It is a ood idea to keep the temperature difference for switchin off the pump reater
than 5 de rees, because when the difference is lower the pump will work too lon , since
the heat exchan ers start to release more inefficiently the heat. Furthermore, there may
be losses and lowerin the temperature on the location of the sensor in the solar collector
to the water heater, which further reduces the differential difference at the heat exchan er.
•The temperature difference for switch on should be such as to compensate for heat
losses between the solar collector and heat exchan er and sufficiently much reater than
the switch off temperature.
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When usin the heat from the solar system, the limitation of the temperature to which the water
heater will be heated is 85 de rees measured from the sensor 5 (t5). When usin the heat from the
boiler, the restriction on the temperature to which the heater will be heated is 80 de rees measured
from the sensor 2 (t2). Above this limit the circulation pumps shall be switched off in order not to
transfer more heat to the water heater.
3.6 Operat on of the thermostat
Dependin of the model of your electronic thermostat some features may not be available.
When the water heater is turned on, it chooses the most suitable heat source. Priority is iven to the
use of the solar collector and the boiler.
If the temperature difference concernin the solar collector Δt1 = t3 – t5 ets reater than the limit
set in the menu „Pumps control“, row „Solar Δt1“, column „On“, the solar collector pump shall
be turned on to transfer its heat to the water heater. When the solar pump is turned on but the
temperature difference Δt1 falls below the limit set on the same line column „Off“, the pump shall
switch off.
When the boiler is set from the menu „Heat ng Installat on“ row „Bo ler Pump Mode“, to operate
in mode „DHW pr or ty“ and if the temperature associated with it Δt2 = t4 – t2 ets reater than
the limit set in the menu „Pumps control“, row „DHW pr or ty Δt2“, column „On“, the boiler
circulation pump shall switch on in order to transfer its heat to the water heater. When the solar
collector pump is turned on but the temperature difference Δt2 falls below the limit set on the same
line column „Off“, the pump shall switch off.
There is one more operation mode for the boiler pump set from the menu „Heat ng Installat on“
row „Bo ler Pump Mode“ - „CH Pr or ty“. When this mode is activated in the menu „Pumps
control“ shall be used the temperatures set in row „CH pr or. t4”, where is set the boiler
temperature limit when the boiler pump switches on and the temperature to which it may fall before
turnin off. In this mode differential temperatures are not used in order to avoid durin heatin of the
water heater to turn off the pump and stop heatin if usin one and only circulatin pump both for
heatin and domestic hot water (DHW).
In order to support the external heat sources when there is not enou h heatin power, the water
heater may use its electric heater. It is controlled by a process aimin to use electricity as a last
resort.
There are two specific solutions to limit the use of the electric heater:
•Such settin can be made so that the heater switches on when the temperature of the
thermo-sensor t5. falls below the limit set in the menu „EL Heat ng Sett ngs“ field
„Heater On Temp.“ and to turn off when it reaches the desired temperature at the
thermo-sensor t1. Thanks to this approach, with a small consumption of hot water, the
temperature at the bottom of the tank may fall quickly, but in the upper part of it will remain
hi her. If meanwhile, the solar installation operates it shall continue to heat water and may
never et to use electricity.
•Furthermore, the temperature that must be reached by heatin with electric power is set
and the temperature below which turns the heater on. This helps to provide additional
tolerance of the fallin water temperature before usin electricity for heatin it. Thus the
solar installation shall have more time to heat the water if there is enou h ener y.
11

3.7 Chang ng the set temperature when work ng w th electr cal heater.
From the main screen, press „up“ to enter the fast mode to
chan e the temperature set in menu „EL Set
Temperature“. Next pressin of the arrows „up“ or „down“
chan es 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
accordin ly at a rate of 4 units per second. The new set
temperature will be saved by pressin Enter or by not
pressin any buttons for 5 seconds:
The temperature set is used only when heated with an
electric heater!
The temperature limits are set between 20 and 75°С.
It is better to use the „EL Heat ng Sett ngs“ menu because throu h it can be controlled not only
the temperature for switchin off the heater, but also for switchin on.
3.8 Sett ng the t mer for add t onal heat ng w th electr c heater (menus „EL Boost T mer 1“
and „EL Boost T mer 2“)
Settin the hour intervals allowed for additional heatin of
water by electric heater. When a timer is active and time is
currently in its ran e, the electric heater will switch on to
heat the water, and shall use the temperature in the column
"Temp" as set temperature and it will switch on if the
temperature of the lower thermo-sensor t1 drops by 5
de rees less than the temperature set in "Temp". The timer
allows exclusion of certain days of the week durin which he
will not act. It happens by darkenin the lowin reen
LEDs.
Note that the time in the column "Beg n" can not be later
than the time in column "End"! The settin of such values is impossible and therefore you may first
need to chan e the time in the column "End" and thereafter in the column "Beg n"!
You can set very low temperatures in the electric heater menu "EL Heat ng Sett ngs" and only
when you expect that you need hot water by turnin on the timer you can force the electric heater to
switch on. If by then the solar system or boiler is warmed enou h the water, the electric heater will
not turn on and you will save electricity costs. Meanwhile, if the sunli ht was not enou h, the heater
will turn on and you will not run out of hot water!
3.9 Sett ng electr c heat ng (EL Heat ng Sett ngs)
The temperature to which the water in the tank is heated
with electric heater is "El Sett ng temp.", and the
temperature below which it is compulsory to switch on the
electric heater is "Heater On temp." and which sensor to
take into account the temperature for switch on the heater
"Bottom sensor t1" or "M ddle sensor t5". Keep in mind
that the temperature set to which the water in the tank is
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heated is accounted by the lower thermo-sensor (t1). When the water temperature is lower than the
one set and the hi her than the switch on temperature the water heater will maintain its last state,
i.e. if it has been switched off it will stay off if it was switched on it will stay on. This rule is not
observed only if you chan e the temperature set, then the heater will turn on and will work to reach
the temperature set.
Note that "El Sett ng temp." must be 5 de rees hi her than "Heater On temp." It is not possible to
set the temperatures unless that condition is satisfied!
RECOMMENDATION! Even if you have ood solar installation and the season is suitable for usin
solar ener y for hot water, we recommend the followin options: "Heater On temp." can be set to a
lower value such as 20 de rees and be measured by "M ddle sensor t5". So even if there is no
sun, the water in the tank will not be colder than the tolerable 20 de rees. The heat exchan er for
the solar collector (bottom) shall heat the water in the measurement of the middle thermo-sensor t5
and if the day is with sufficient sun radiation the temperature measured by this sensor is unlikely to
drop more than 20 de rees and the electric heater will not switch on. We recommend that you set
"El Sett ng temp." at 40-45 de rees, because if there is no sun the water heater will be heated by
the electric heater to such a temperature that can be used for any household needs, but at the
same time if there is a stron sun it can take as well its heat.
3.10 Pumps control
Temperature settin s for switchin 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 switchin on and off of the pump. In
case of temperature difference over the value in the column
"On" the pump will switch on and run until the difference
falls less than the value set in the column "Off"
Bo ler DHW pr or. ∆t2 (NHC-H52M-2)
The differential temperature between boiler and the water heater for switchin on and off the pump
in mode with priority for heatin the water heater for domestic hot water (DHW). In case of
temperature difference over the value in the column "On" the pump will switch on and run until the
difference falls less than the value set in the column "Off"
CH pr or. t4 (NHC-H52M-2)
Adjust the temperature for switchin on/off of the boiler circulatin pump in heatin priority mode for
the heatin installation. When the temperature measured by
the probe panel in the boiler (t4) is hi her than or equal to
the temperature set in the column "On" the boiler pump
shall switch on. When this temperature falls below the value
in the column "Off", the pump will turn off.
3.11 Heat ng Installat on
Check any heat source that works with the water heater. If
you still do not have systems for boiler or solar collector, you
can disable the service from this menu. Furthermore, in
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order not to consume more electricity by the electric heater you can deactivate it in this menu.
"Bo ler pump mode" (for NHC-H52M-2) determines the operation of the boiler circulatin pump
which instalation has hi her priority: CH or DHW.
IMPORTANT! If you deactivate the solar collector you will stop as well protective re imes a ainst
freezin or overheatin !
3.12 In t at ng N ght/Day tar ff
Settin the be innin of the day and ni ht tariff. This is
important information for the proper accountin of consumed
electricity!
3.13 Solar protect on
Setup Menu protection re imes of the solar system. Settin s
parameters:
Auto Hol day mode (NHC-H52M-1S / NHC-H52M-2)
When this field is checked automatic start mode for
dischar in heat from the water heater at ni ht is allowed -
"Hol day" Thanks to this dischar e the solar system will be
protected from overheatin under stron sunli ht the next
day by transferrin heat to already chilled water in the water
heater.
Tank m n temp. (NHC-H52M-1S / NHC-H52M-2)
If heat dischar e is activated for the accumulated heat in the
water tank when you activate Holiday mode, the temperature
will be reduced to the value set in this field.
Use bo ler pump (NHC-H52M-2)
When this field is checked the dischar e of the heat from the water heater will happen not only with
the circulation pump of the solar system but with the boiler system too.
Solar ant -frost (NHC-H52M-1S / NHC-H52M-2)
Activatin the mode for Anti-freeze protection of the solar collector.
Ant -frost temp (NHC-H52M-1S / NHC-H52M-2)
Below what temperature to switch on the mode to protect the solar collector from freezin .
Solar overheat ng (NHC-H52M-1S / NHC-H52M-2)
Over what temperature an alarm for overheatin of the solar collector switches on.
3.14 System Sett ngs
From the field "L ght" adjust the bri htness of the display.
Enter here information for the power the heater throu h the
field "El. Power". By default the parameters saved are for
water heater with a power of 3kW heater and availability of
anode protection. If your water heater has the same
specifications you do not need additional customization.
Select "Ant -Leg onella" mode if you want to activate it.
When this mode is enabled if the water in the water heater
is not heated to more than 70° C for one week, it will
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switch on the electric heater to heat the water to 70 de rees. This is done in order to prevent the
development of "le ionella" bacteria in the water container. The electric heater shall switch on when
ni ht electricity tariff is active. From this menu you can run test pumps for both installations by fields
"Solar" (for NHC-H52М-1S and NHC-H52М-2) and "Bo ler" (for NHC-H52М-2). If you want to
adjust the power of the solar pump dependin on the differential temperature, you must mark the
box on the line "Solar pump adjust". From this menu you can run the test pump of the solar
installation via the "Solar" field. In this field, the power at which the pump can be tested can be
selected: 0-off, P1-low power and P2-maximum power.
We recommend that you turn on the power pump P1 after checkin the solar collector installation
for the first time to check if it works. If it does not work at this power, you must turn off the power
control.
IMPORTANT! If you do not perform other settin s, when activatin one of the pumps, it will work 5
minutes after which the screen will automatically close and the pumps will switch to the normal
automatic control!
ATTENTION! Turnin on and off the heater from the apartment electricity panel does not chan e
the temperature set and its mode of operation left before its last switch off.
If the unit is left in a switched on state when shutdown and then switched on a ain it will have the
same temperature settin s.
ATTENTION! When for lon periods you do not use hot water and the sun is stron enou h, do not
disconnect the water heater from the apartment electricity panel. This can dama e the standin
outdoor on direct sunli ht collector.
Your water heater will automatically enter in Hol day mode at ni ht to dischar e the accumulated
heat and so it can store new heat the next day and protect the solar system from overheatin .
4. ADDITIONAL FEATURES AND INFORMATION FIELDS
4.1 Add t onal features f eld (F g. 3)
Displays the information when the water heater performs any of its specific additional features or is
off. The messa es in this field are listed in Table 5:
Table 5 - Messages n the f eld Add t onal features
Message Descr pt on
Ant -Leg onella Currently, the water heater shall be heated by the electric heater to 70oC for killin the
dan erous Le ionella bacteria.
Heat d scharge
This procedure shall dischar e the accumulated heat in the water heater in order to
allow the next day to dischar e the heat from the solar collector without overheatin
the water.
El heater boost
Currently one of the timers adjusted in the menu „EL Boost T mers“ is active. In this
situation, if the electric heater is not switched off from the menu „Heat ng
Installat on“ shall turn on to reach the temperature set by this timer. The thermo-
sensor measurin the temperature at which the heater shall turn on or off, it t1. The
hysteresis (the difference between the temperature of switchin the heater on and off)
is 5 de rees.
Ant -frost Prevention of freezin for the water heater and the solar collector. Switchin on the
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(Freez ng
protect on)
electric heater it warms the water in the tank to avoid freezin while the solar pump
dischar es the heat from the water heater, in order to protect the solar collector as
well.
Solar protect on
Prevents eventual overheatin of the solar collector. If the solar collector thermo-
sensor (t3) is not operatin (not workin ), the solar pump shall be turned on constantly
to avoid any possible overheatin .
Hol day
The water heater is in manually activated Hol day mode, which aims unloadin the
accumulated heat durin the ni ht so that the next day when reheated by the sun
overheatin of the solar collector is prevented.
Standby The electric heater is switched off.
4.2 Informat on f eld (F g. 3)
Basically in this field is displayed the date startin with the day of the week in the followin format:
DD/MM/YYYY. Upon re istration of a failure of the self-test system, in the bottom line field shall
alternate the date and the (error) messa e while a clear sound shall be audible as well. The (error)
messa es are listed in Table 6:
Table 6 - Informat on f eld messages
Message Descr pt on
No nformat on! At the moment there is no information concernin new issues or errors
Sw tch on Hol day
mode
Switched on mode for dischar e of the heatin ener y collected in the water heater
durin the day. (Holiday mode).
Solar ant -frost Switched on mode for protectin the solar collector a ainst freezin .
Freez ng protect on
of the bo ler Switched on mode for protectin the water heater from freezin .
Error read ng mage Error durin downloadin an ima e from the schematic dia ram of the heatin
system to the main screen.
D sconnected S1 Failure of the bottom thermal sensor of the water heater (t1). It may be either
interrupted/disconnected or switched off.
S1 n short-c rcu t Failure of the bottom thermal sensor of the water heater (t1). It is in short-circuit.
D sconnected S2 Failure of the bottom thermal sensor of the water heater (t2). It may be either
interrupted/disconnected or switched off.
S2 n short-c rcu t Failure of the top thermal sensor of the water heater (t2). It is in short-circuit.
D sconnected S3
Failure of the solar collector thermal sensor (t3). It may be either
interrupted/disconnected or switched off. Only the modes with electric and boiler
heatin shall be operative. In th s s tuat on the solar nstallat on c rculat on
pump w ll work cont nuously to protect the solar collector from overheat ng!
S3 n short-c rcu t
Failure of the solar collector thermal sensor (t3). It is in short-circuit. Only the modes
with electric and boiler heatin shall be operative. In th s s tuat on the solar
nstallat on c rculat on pump w ll work cont nuously to protect the solar
collector from overheat ng!
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D sconnected S5 Failure of the middle thermal sensor of the water heater (t5). It may be either
interrupted/disconnected or switched off.
S5 n short-c rcu t Failure of the middle thermal sensor of the water heater (t5). It is in short-circuit.
Frozen bo ler
When switchin on the power the water in the water heater has ne ative
temperature and may be frozen. You need to check the inte rity of the water
container and only then switch on the power a ain.
Solar unprotected The solar installation is switched off from the menu „Heat ng Installat on” and if it is
installed it may be dama ed either by overheatin or by freezin .
Off all heaters!
All heatin sources are switched off from the menu „Heat ng Installat on”. If the
solar installation is installed it may be dama ed either by overheatin or by freezin .
The same is true for switchin off the water heater freezin protection mode.
Solar overheat ng Solar collector overheatin shall be re istered when the t3 temperature exceeds the
temperature in the field „Solar overheat ng“ from the menu „Solar protect on“
Error read ng mage The test for readin the ima es displayed on the screen is not passed.
Ant -Leg onella Activated mode for destroyin the Le ionella bacteria by heatin the water with
electric heater to 70 de rees.
Power supply off * Latest time and date to when the thermostat is workin before you interrupted power
supply.
Power supply on* Time and date when the power supply is restored.
* These messages w ll be reg stered only f the system clock has been set.
4.3 Delete alarms (tr ggered by errors)
When one of any re istered issues (errors) causin activation of the alarm is fine, the messa e that
was about it, disappears from the information field.
If all error messa es disappear stops and alarm. Exceptions are issues as „Solar overheat ng“
and „Bo ler overheat ng“, to erase error messa es and si nals for alarm should be deleted from
the dia nostics thermostat display. To do this you must first press the key Enter twice from the main
display to enter the display „D agnost cs“. Then a ain press and hold the Enter key for over 3
seconds to erase all messa es concernin issues.
If any of the heatin sources is not activated from the „Heat ng Installat on“ menu it shall be
displayed dimmed and the correspondin field for the temperature measured shall not be displayed.
If the electric heater is not activated, it will not be visible.
If the clock is not set, it will be displayed with hyphens: --:--. The thermostat has a battery that
supports the timin of short-term power failure. The maximum time for time support is 48 hours,
then the clock shall turn off and shall need your re-verification.
If in the middle part of the display there is not the ima e of Fi . 4 we recommend to reset the
thermostat by turnin off power to the boiler, and then turn it on a ain!
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4.4 Data d splays
Statistics by the hours – By pressin the button Confirm (Enter), when the thermostat is in „Ma n
d splay“ you may proceed to consideration of the additional data screens. First you shall see
displayed the raphics of consumed power and the work of pumps for the last three days. You may
scroll these raphics with the arrow keys „up“ and „down“. The display may happen with the entire
histo ram on the screen. The coordinate system is with a horizontal axis with the hours of the day
and a vertical axis to ener y consumption in kW/h or a cumulative operatin time in minutes of each
circulatin pump. On the top of the screen is the date concernin the information displayed, while at
the bottom is provided a summary for the day.
4.5 Informat on
By pressin the button Enter after the state „Statistics by the hours”, shall be passed to the screen
„Information“
By holdin the Enter key for over 2 seconds the readin s for the day and ni ht electricity
consumption shall be reset. Furthermore, the unit shall remember the date and time of this reset,
thanks to which you will have information on how lon is your cumulated electricity consumption.
4.6 W F connect on
The state of the Internet connection is displayed on screen „Informat on“ after pressin the down
arrow you pass to the screen with information about the communication module with Internet.
If there is no WiFi modem connected to the electronic bloc, there will be a messa e „No W F
modem!“
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Usin the water heater via a WiFi connection is possible only with provided by the producer WiFi
modem. For further information contact the manufacturer / supplier of your water heater.
4.6а Controller vers on
Once the arrow „down“ is pressed from the screen „WiFi connection“, proceed to the information
screen with the version of the controller and software in it.
4.7 D agnost cs
Next pressin of the Enter button shall display the last
information screen „D agnost cs“, which consists of a list of
information about every re istered problem and the exact
time and date of its occurrence. If these are more than three
with the arrows „down“ and „up“ shall be displayed the next
pa e. By holdin the Enter key for over two seconds the
accumulated dia nostic information shall be cleared. The
symbol „star“ marks both the latest and the newest
re istered issue. The messa es that you can see on this
screen are the same as reports of failures and errors listed
in Table 6.
5. UNIT MODES
5.1 Protect on modes
The protection modes are desi ned to protect the installations of the boiler, the solar collector and
the water heater in case of extreme operative conditions. Whether the water heater is on or off and
notwithstandin in which mode it works, the thermostat shall continuously monitor the temperature
as the water in the water tank and the solar collector. If necessary, the protection mode shall be
switched on for:
•Ant -freez ng protect on of the solar collector (NHC-H52M-1S / NHC-H52M-2). This
protection brin s heat from the water heater to protect the solar collector from freezin . It
activates when the temperature measured in the collector falls below „Solar protect on“
limit on row „Ant -frost temp.“. This function may be switched off from the same menu
line „Solar ant -frost“.
•Protect on from freez ng 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 de rees.
•Protect on aga nst overheat ng of the solar collector (NHC-H52M-1S / NHC-H52M-2).
If the temperature of the solar collector ets above 90 de rees, the circulation pump of
the solar shall switch on re ardless of the temperature difference. The pump will switch off
if the water temperature in the tank ets above 85 de rees.
•Protect on aga nst overheat ng of the water tank (NHC-H52M-2). For available and
activated heatin system. If the water temperature in the middle of the water heater
(measured by t5) exceeds 80 de rees and the water temperature in the boiler is below 50
de rees will turn on the heatin system pump for release of the accumulated heat. The
pump will operate until the temperature falls to 76 de rees on the same thermo-sensor or
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the water temperature in the boiler exceeds 50 de rees.
•Automat cally act vated Hol day mode (NHC-H52M-1S / NHC-H52M-2). Serves to
dischar e the accumulated heat in the water tank. This option is activated by markin
from the menu „Solar protect on“, line „Auto Hol day mode“. If after 21 o'clock the
water temperature in the middle of the water heater (measured by t5) is over 77 de rees
in the absence of hot water consumption, the temperature ets above 60 de rees, will
prepare switchin on to this mode. Consequently, in the interval between 00:00 and 5:00
the system shall switch on the solar and the boiler pumps if this is allowed. The purpose is
to be in the transfer of heat from the water heater to the solar and due to existin ener y
losses throu h the pipes and into the solar collector when there is no sun, to cool off the
water in the water heater. Thus a ain the next day will have the opportunity to accumulate
a new heat in order to dischar e the solar collector. The pump will operate until the
temperature in the tank falls below the temperature set in „Solar protect on“, line „Tank
m n temp.“. This mode is indicated with caption „Heat release“ in the field „Add t onal
features“ on the screen. For faster dischar e of heat from the heater possible use in
parallel and the boiler pump, which is activated by markin menu „Solar protect on“, line
„Use bo ler pump“.
IMPORTANT! When there is dan er from temperature fall or overheatin of the collector, it is
recommended to keep the water heater connected to the mains!
5.2. Hol day mode
Only the solar installation and the protective re imes shall remain active. Besides the normal
operation of the solar durin the day it will include a compulsory re ime for dischar in heat from
the heater at ni ht. This mode will be particularly useful if you know that you will be away from home
for lon and there will be no demand for hot water. In this situation the tank can not accumulate
infinite heat and will need periodically to dischar e in order to cool the solar durin the day.
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