Regulus DUO N PR User manual

www.regulus.eu
DUO N PR
DUO N PR
EN
Installation and Operation Manual
DUO Thermal Store with Immersed DHW Tank
DUO 390/130 N PR, DUO 600/200 N PR, DUO 750/200 N PR,
DUO 1000/200 N PR, DUO 1700/200 N PR

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CONTENTS
1 Description .................................................................................................................................... 3
1.1 Models .............................................................................................................................. 3
1.2 Tank protection .................................................................................................................. 3
1.3 Thermal insulation ............................................................................................................. 3
1.4 Packaging ......................................................................................................................... 3
2 General Information ...................................................................................................................... 3
3 Technical Data and Dimensions .................................................................................................. 4
4 Operation ....................................................................................................................................... 9
5 Typical Layout Example with Thermal Store .............................................................................. 9
6 Installation and Commissioning ................................................................................................. 10
6.1 Connection to heat sources .............................................................................................. 10
6.2 Connection to a solar thermal system ............................................................................... 10
6.3 Heating element installation .............................................................................................. 10
6.4 Connection to water mains ................................................................................................ 10
6.5 Commissioning .................................................................................................................. 10
7 Installing Insulation on the Tank ................................................................................................. 11
8 Maintenance .................................................................................................................................. 12
9 Disposal ......................................................................................................................................... 12
10 Warranty ...................................................................................................................................... 12

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1 - Description
DUO N Thermal Stores are intended for storing and subsequent distribution of thermal energy from various
heat sources like solid-fuel boilers, heat pumps, electric boilers etc. A DHW tank is integrated inside the
thermal store. For a better thermal layering, the tank volume is separated by a metal plate. The lower section
is equipped with a solar heat exchanger. The thermal store shall to be connected to a sealed heating system
with forced circulation.
For proper operation of a tank, it is necessary to have an optimum hydraulic design of the entire heating
system, i.e. position of circulation pumps for both heat sources and heating circuits, valves, non-return valves
etc. When more heat sources shall be combined, it is recommended to use a smart controller for both the heat
source and heat consumer sections of a heating circuit, i.e. also for charging and discharging a thermal store.
1.1 - Models
Models DUO 390/130 N PR, DUO 600/200 N PR, DUO 750/200 N PR, DUO 1000/200 N PR
and DUO 1700/200 N PR permitting installation of electric heating elements and other external heat sources.
1.2 - Tank protection
The inner DHW tank is made of stainless steel. A chain-type magnesium anode is installed in it for an inc-
reased level of protection. The thermal store has no inner surface nish, the outer surface is lacquered.
1.3 - Thermal insulation
Thermal insulation is available as a separate item. For easier handling, the insulation shall not be tted on the
tank until it reaches its denite place of installation. The insulation is made of eece, 100 mm thick, with a hard
polystyrene surface. It is closed by quick locks.
1.4 - Packaging
Tanks are delivered standing, each screwed to its pallet, packed in bubble wrap. The tank is then
shrink-wrapped together with its pallet.
It is forbidden to transport and/or store the storage tanks in a horizontal position.
2 - General Information
This Owners Manual is an integral and important part of the product and must be handed over to the User.
Read carefully the instructions in this Manual as they contain important information concerning safety,
installation, operation and maintenance. Keep this Manual for later reference. The appliance shall be installed
by qualied staff according to valid rules and Manufacturer‘s Instructions.
This appliance is designed to accumulate heating water and distribute it subsequently. It shall be connected
to a heating system and heat sources. This appliance is also suitable for accumulator heating of domestic hot
water.
Using the Thermal Store for other purposes than above described is forbidden and the manufacturer accepts
no responsibility for damage caused by improper or wrong use or lling procedure.
Before lling the thermal store, ll and pressurize the inner DHW tank rst!!!

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Dimensions
CONNECTIONS
pos. descriptions
connection height [mm]
Heat sources
B1 Incoming from heat source G 1ʺ F/4 1780
B2 Return to heat source G 1ʺ F/4 1130
B3 Incoming from heat source G 1ʺ F/4 1630
B4 Return to heat source G 1ʺ F/4 1880
B5 Incoming from heat source G 1ʺ F/4 1540
Heating system
H1 Outlet to the heating circuit G 1ʺ F/4 1780
H2 Return from the heating circuit G 1ʺ F/4 1210
Solar system
X1 Incoming from solar collectors G 1“ FF1660
X2 Return to solar collectors G 1“ FF1210
Electric heating elements
E1
Electric heating element for space heating G 6/4ʺ F 1720
E2
Electric heating element for space heating G 6/4ʺ F 1720
E3
Electric heating element for DHW heating G 6/4ʺ F 1980
DHW heating
W1 Cold water G 3/4ʺ M 1910
W2 Hot water G 3/4ʺ M 1910
W3 Recirculation G 3/4ʺ M 1910
A1 Anode G 3/4ʺ F 1810
Control and safety
C1 Temperature sensor – space heating G 1/2ʺ F 1750
C2 Temperature sensor – solar G 1/2ʺ F 1510
C3 Temperature sensor – DHW heating G 1/2ʺ F 1160
C4 Temperature sensor – DHW heating G 1/2ʺ F 1020
T2Thermometer G 1/2ʺ F 1630
M2Pressure gauge G 1/2ʺ F 1510
P2Safety valve G 1/2ʺ F 1400
Air release
O2Air vent valve G 1/2ʺ F 1885
Other
F1 Attaching the pump station M 6 1430
F2 Attaching the pump station M 6 1270
Tipping height without insulation 1950 mm
3 - Technical Data and Dimensions
Regulus DUO N PR
Regulus DUO 390/130 N PR Thermal Store (code:19139, insulation - code: 19293)
Total volume: ............................................................................. 396l
Immersed DHW tank volume: .................................................... 264 l
Fluid volume in Thermal Store: .................................................. 123 l
Heat exchanger (HX) volume: .................................................... 9 l
Heat exchanger surface area: .................................................... 1,5 sqm
Max. working temp. in thermal store: ......................................... 95 °C
Max. working temperature in heat exchanger: ............................ 95 °C
Max. working temperature in DHW tank: .................................... 95 °C
Max. working pressure in DHW tank: ......................................... 3 bar
Max. working pressure in thermal store: .................................... 6 bar
Max. working pressure in HX: .................................................... 10 bar
Empty weight: ............................................................................ 117 kg

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Regulus DUO 600/200 N PR Thermal Store (code:19133, insulation - code: 19321)
Dimensions
CONNECTIONS
pos. descriptions
connection height [mm]
Heat sources
B1 Incoming from heat source G 6/4ʺ F 1985
B2 Return to heat source G 6/4ʺ F 1135
B3 Incoming from heat source G 6/4ʺ F 1635
B4 Return to heat source G 6/4ʺ F 1090
B5 Incoming from heat source G 1ʺ F/4 1570
B6 Incoming from heat source G 6/4ʺ F 1660
Heating system
H1 Outlet to the heating circuit G 1ʺ F/4 1030
H2 Return from the heating circuit G 1ʺ F/4 1225
Solar system
X1 Incoming from solar collectors G 1“ FF1030
X2 Return to solar collectors G 1“ FF1225
Electric heating elements
E1
Electric heating element for space heating G 6/4ʺ F 1890
E2
Electric heating element for space heating G 6/4ʺ F 1890
E3
Electric heating element for DHW heating G 6/4ʺ F 1180
DHW heating
W1 Cold water G 3/4ʺ M 1935
W2 Hot water G 3/4ʺ M 1935
W3 Recirculation G 3/4ʺ M 1935
A1 Anode G 3/4ʺ F 1835
Control and safety
C1 Temperature sensor – space heating G 1/2ʺ F 1000
C2 Temperature sensor – solar G 1/2ʺ F 1625
C3 Temperature sensor – DHW heating G 1/2ʺ F 1310
C4 Temperature sensor – DHW heating G 1/2ʺ F 1220
T2Thermometer G 1/2ʺ F 1635
M2Pressure gauge G 1/2ʺ F 1510
P2Safety valve G 1/2ʺ F 1400
Air release
O2Air vent valve G 1/2ʺ F 1915
Other
F1 Attaching the pump station M 6 1660
F2 Attaching the pump station M 6 1500
Tipping height without insulation 1970 mm
Total volume: ............................................................................. 559
Immersed DHW tank volume: .................................................... 372 l
Fluid volume in Thermal Store: .................................................. 174 l
Heat exchanger (HX) volume: .................................................... 13 l
Heat exchanger surface area: .................................................... 2,4 sqm
Max. working temp. in thermal store: ......................................... 95 °C
Max. working temperature in heat exchanger: ............................ 95 °C
Max. working temperature in DHW tank: .................................... 95 °C
Max. working pressure in DHW tank: ......................................... 3 bar
Max. working pressure in thermal store: .................................... 6 bar
Max. working pressure in HX: .................................................... 10 bar
Empty weight: ............................................................................ 154 kg

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Regulus DUO 750/200 N PR Thermal Store (code:19135, insulation - code: 19327)
Dimensions
CONNECTIONS
pos. descriptions
connection height [mm]
Heat sources
B1 Incoming from heat source G 6/4ʺ F 1960
B2 Return to heat source G 6/4ʺ F 1155
B3 Incoming from heat source G 6/4ʺ F 1655
B4 Return to heat source G 6/4ʺ F 1065
B5 Incoming from heat source G 1ʺ F/4 1590
B6 Incoming from heat source G 6/4ʺ F 1635
Heating system
H1 Outlet to the heating circuit G 1ʺ F/4 1005
H2 Return from the heating circuit G 1ʺ F/4 1245
Solar system
X1 Incoming from solar collectors G 1“ FF1795
X2 Return to solar collectors G 1“ FF1255
Electric heating elements
E1
Electric heating element for space heating G 6/4ʺ F 1865
E2
Electric heating element for space heating G 6/4ʺ F 1865
E3
Electric heating element for DHW heating G 6/4ʺ F 1155
DHW heating
W1 Cold water G 3/4ʺ M 1980
W2 Hot water G 3/4ʺ M 1980
W3 Recirculation G 3/4ʺ M 1980
A1 Anode G 3/4ʺ F 1880
Control and safety
C1 Temperature sensor – space heating G 1/2ʺ F 1975
C2 Temperature sensor – solar G 1/2ʺ F 1615
C3 Temperature sensor – DHW heating G 1/2ʺ F 1285
C4 Temperature sensor – DHW heating G 1/2ʺ F 1195
T2Thermometer G 1/2ʺ F 1655
M2Pressure gauge G 1/2ʺ F 1510
P2Safety valve G 1/2ʺ F 1400
Air release
O2Air vent valve G 1/2ʺ F 1960
Other
F1 Attaching the pump station M 6 1680
F2 Attaching the pump station M 6 1520
Tipping height without insulation 2040 mm
Total volume: ............................................................................. 757 l
Immersed DHW tank volume: .................................................... 568 l
Fluid volume in Thermal Store: .................................................. 174 l
Heat exchanger (HX) volume: .................................................... 15 l
Heat exchanger surface area: .................................................... 2,5 sqm
Max. working temp. in thermal store: ......................................... 95 °C
Max. working temperature in heat exchanger: ............................ 95 °C
Max. working temperature in DHW tank: .................................... 95 °C
Max. working pressure in DHW tank: ......................................... 3 bar
Max. working pressure in thermal store: .................................... 6 bar
Max. working pressure in HX: .................................................... 10 bar
Empty weight: ............................................................................ 176 kg

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Regulus DUO 1000/200 N PR Thermal Store (code: 19149, insulation - code: 19329)
Dimensions
CONNECTIONS
pos. descriptions
connection height [mm]
Heat sources
B1 Incoming from heat source G 6/4ʺ F 1115
B2 Return to heat source G 6/4ʺ F 1200
B3 Incoming from heat source G 6/4ʺ F 1700
B4 Return to heat source G 6/4ʺ F 1220
B5 Incoming from heat source G 1ʺ F/4 1635
B6 Incoming from heat source G 6/4ʺ F 1785
Heating system
H1 Outlet to the heating circuit G 1ʺ F/4 1160
H2 Return from the heating circuit G 1ʺ F/4 1290
Solar system
X1 Incoming from solar collectors G 1“ FF1950
X2 Return to solar collectors G 1“ FF1300
Electric heating elements
E1
Electric heating element for space heating G 6/4ʺ F 1020
E2
Electric heating element for space heating G 6/4ʺ F 1020
E3
Electric heating element for DHW heating G 6/4ʺ F 1310
DHW heating
W1 Cold water G 3/4ʺ M 2080
W2 Hot water G 3/4ʺ M 2080
W3 Recirculation G 3/4ʺ M 2080
A1 Anode G 3/4ʺ F 1980
Control and safety
C1 Temperature sensor – space heating G 1/2ʺ F 1130
C2 Temperature sensor – solar G 1/2ʺ F 1740
C3 Temperature sensor – DHW heating G 1/2ʺ F 1440
C4 Temperature sensor – DHW heating G 1/2ʺ F 1350
T2Thermometer G 1/2ʺ F 1700
M2Pressure gauge G 1/2ʺ F 1510
P2Safety valve G 1/2ʺ F 1400
Air release
O2Air vent valve G 1/2ʺ F 2060
Other
F1 Attaching the pump station M 6 1725
F2 Attaching the pump station M 6 1565
Tipping height without insulation 2120 mm
Total volume: ............................................................................. 903 l
Immersed DHW tank volume: .................................................... 711 l
Fluid volume in Thermal Store: .................................................. 174 l
Heat exchanger (HX) volume: .................................................... 18 l
Heat exchanger surface area: .................................................... 3,2 sqm
Max. working temp. in thermal store: ......................................... 95 °C
Max. working temperature in heat exchanger: ............................ 95 °C
Max. working temperature in DHW tank: .................................... 95 °C
Max. working pressure in DHW tank: ......................................... 3 bar
Max. working pressure in thermal store: .................................... 6 bar
Max. working pressure in HX: .................................................... 10 bar
Empty weight: ............................................................................ 195 kg

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Regulus DUO 1700/200 N PR Thermal Store (code: 19145, insulation - code: 19357)
Dimensions
CONNECTIONS
pos. descriptions
connection height [mm]
Heat sources
B1 Incoming from heat source G 6/4ʺ F 1150
B2 Return to heat source G 6/4ʺ F 1235
B3 Incoming from heat source G 6/4ʺ F 1675
B4 Return to heat source G 6/4ʺ F 1255
B5 Incoming from heat source G 1ʺ F/4 1610
B6 Incoming from heat source G 6/4ʺ F 1820
Heating system
H1 Outlet to the heating circuit G 1ʺ F/4 1195
H2 Return from the heating circuit G 1ʺ F/4 1325
Solar system
X1 Incoming from solar collectors G 1“ FF1935
X2 Return to solar collectors G 1“ FF1335
Electric heating elements
E1
Electric heating element for space heating G 6/4ʺ F 1055
E2
Electric heating element for space heating G 6/4ʺ F 1055
E3
Electric heating element for DHW heating G 6/4ʺ F 1295
DHW heating
W1 Cold water G 3/4ʺ M 2080
W2 Hot water G 3/4ʺ M 2080
W3 Recirculation G 3/4ʺ M 2080
A1 Anode G 3/4ʺ F 1980
Control and safety
C1 Temperature sensor – space heating G 1/2ʺ F 1165
C2 Temperature sensor – solar G 1/2ʺ F 1775
C3 Temperature sensor – DHW heating G 1/2ʺ F 1425
C4 Temperature sensor – DHW heating G 1/2ʺ F 1335
T2Thermometer G 1/2ʺ F 1675
M2Pressure gauge G 1/2ʺ F 1510
P2Safety valve G 1/2ʺ F 1400
Air release
O2Air vent valve G 1/2ʺ F 2060
Other
F1 Attaching the pump station M 6 1700
F2 Attaching the pump station M 6 1540
Tipping height without insulation 2200 mm
Total volume: ............................................................................. 1682 l
Immersed DHW tank volume: .................................................... 1486 l
Fluid volume in Thermal Store: .................................................. 174 l
Heat exchanger (HX) volume: .................................................... 22 l
Heat exchanger surface area: .................................................... 4,0 sqm
Max. working temp. in thermal store: ......................................... 95 °C
Max. working temperature in heat exchanger: ............................ 95 °C
Max. working temperature in DHW tank: .................................... 95 °C
Max. working pressure in DHW tank: ......................................... 3 bar
Max. working pressure in thermal store: .................................... 6 bar
Max. working pressure in HX: .................................................... 10 bar
Empty weight: ............................................................................ 268 kg

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Regulus DUO 1700/200 N PR Thermal Store (code: 19145, insulation - code: 19357) 4 - Operation
This tank is designed to accumulate thermal energy in household or industrial applications, however always in
sealed pressure circuits with forced circulation.
Hot water is heated by heating water inside the integrated DHW tank. It connects with ttings to both cold
and hot water piping, possibly also to a hot water recirculation circuit. When hot water is drawn from an outlet
point, cold water ows into the immersed DHW tank and heats up from the heating water in the thermal store
to a temperature set by the thermostat placed in the sheath of the DHW tank, or in a heating system controller.
Hot water temperature should be set to 60-65 °C. This temperature guarantees the best operation and at the
same time, it prevents formation of Legionella bacteria.
5 - Typical Layout Example with Thermal Store
Hydraulic variant : Solar set with heat pump combined with electric heating elements and replace
KEY 1 – Regulus heat pump (RTC, CTC) 2 – pump station for heat pump – CSE TC iPWM MFB 3 – zone valves for DHW heating from HP 4 – DHW expansion vessel 5 – electric heating elements for heating system 6 – Regulus DUO xxx N PR thermal store 7 – RGMAT E load unit 8 – replace insert (stove) w. hydronic heat exchanger 9 – pump station for heating system 2 - CSE2 MIX 10 – pump station for heating system 1 - CSE2 MIX 11 – collector/manifold, HV 60/125-2 12 – pump station for DHW recirculation – CSE TVMIX ZV 13 – safety kit for HW storage tank 14 – DHW expansion vessel 15 – el. heating element for DHW 16 – solar collectors 17 – CSE SOL P solar pump station SV – cold water TV – hot water CV – hot water recirculation ÚT – central heating (heating system) KK – ball valve ZV – check valve AOV – automatic air vent valve PTR – pressure temperature relief valve REDV – pressure reducing valve (optional) VK – drain valve SVE – expansion vessel service valve PV-ÚT – safety valve for heating system MFB – Magnet Filterball
BRAIDED HOSE
COMPENSATOR

6 - Installation and Commissioning
Installation shall meet valid rules and may be done by qualied staff only.
Installation of an el. heating rod may be done by qualied staff only.
Defects caused by improper installation, use or handling are not covered by warranty.
After the tank is installed and connected to an existing heating system, it is recommended to clean the entire
heating system using a suitable cleaning agent, e.g. BP 400. Anti-corrosion protective liquid should be also
used, e.g. BP 100 Plus.
6.1 - Connection to heat sources
Place the tank on the oor, as close to your heat source as possible and level it. Connect the heating system
according to one of the schematic diagrams - see Chap. 5. Install a drain valve at the lowest point of the tank.
Install an air vent valve at the highest point of the system. Insulate all the connection piping.
6.2 - Connection to a solar thermal system
The tank can be used with a solar system. In such a case, the inlet for hot heat-carrying liquid coming from
the solar thermal system shall be connected to the G 1” upper sleeve of the heating coil. The lower G 1”
heating coil outlet shall be connected to the return solar piping through which cooled solar uid returns to solar
collectors. Insulate meticulously all the piping between the tank and the solar thermal system.
6.3 - Heating element installation
Electric heating elements shall be installed into G 6/4“ side connections. They can be connected either directly
(elements with integrated thermostat) or via the controller of the entire heating system. Electric heating ele-
ments shall be wired by a professionally qualied person only.
Warning: All electric heating elements shall be protected by a safety thermostat.
6.4 - Connection to water mains
DHW piping shall be done according to valid rules. The connection to the tank, including the ttings, is shown
in the diagram of the recommended connections in Chap. 5. Installation of a pressure reducing valve on the
immersed tank inlet is recommended. For water mains pressure above 6 bar a pressure reducing valve is
necessary. To prevent water loss, we recommend installing an expansion vessel at the cold water inlet to the
immersed tank with a minimum volume of 4% of the total volume of water in the DHW piping, including heat
exchangers, recirculation pipes, etc. (usually 8 l). Installation of an expansion vessel is one of the necessary
conditions for the extended warranty. Should the water be too hard, install a water softener upstream of the
tank. In case the water source contains mechanical impurities, install a lter.
6.5 - Commissioning
During commissioning, the immersed hot water tank shall be lled and pressurized rst, after that the
thermal store can be lled. If the thermal store was lled rst, the DHW tank would get damaged!!!
The tank shall be lled up together with the heating system, respecting valid standards and rules. In order to
minimize corrosion, special additives for heating systems should be used. The quality of heating water de-
pends on the quality of lling water at commissioning, on the top-up water and on the frequency of topping
up. This has a strong inuence on the lifetime of heating systems. Poor quality of heating water may cause
problems like corrosion or incrustation, esp. on heat transfer surfaces.
Quality of DHW shall meet the conditions shown in the Table of limit values for total dissolved solids in hot
water in Chap. 6.4. of this Manual.
Fill the heating system with the appropriate uids and air-bleed the entire system. Check all connections for
leaks and verify the system pressure. Set the heating controller in compliance with the documentation and
manufacturer’s recommendations. Check regularly the proper function of all control and adjustment elements.
Table of limit values for total dissolved solids in hot water.
Description pH Total dissolved
solids (TDS)
Ca Chlorides Mg Na Fe
Max. value 6.5 - 9.5 600 mg/l 40 mg/l 100 mg/l 20 mg/l 200 mg/l 0,2 mg/l
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7 - Installing Insulation on the Tank
Product description
Thermal insulation is a part of thermal stores, preventing heat loss. For easier handling, the insulation shall not
be fitted on the tank until it reaches its definite place of installation.
Warning
Insulation installation shall be done in two persons. Do not use any tools for installation. Keep away from open fire.
Installing Insulation
1. Fix the tank following installation instructions.
2. Wrap the insulation around the tank carefully. Check that the insulation adheres to its body perfectly. This can
be reached by rubbing and patting the insulation by hand from its center evenly in both directions until the
insulation adheres to the tank’s surface completely and no bubbles are left.
3. Use the holes for connections as a rest during the insulation installation.
4. At least one person presses the insulation to the tank, pulling both ends together. The other person closes the
insulation lock from the side.
5. Put on the upper insulation and cover.
6. Push on the covering plastic rosettes depending on the size of connections.
7. Finish the tank installation in compliance with the respective instructions and valid standards and rules.
Warranty on insulation
□ Warranty shall become null and void if:
○ the procedure described in the Installation Manual was not respected
○ the product was used for other purposes than intended.
□ Warranty does not cover:
○ usual wear and tear,
○ damage caused by fire, water, electricity or a natural disaster,
○ defects caused by failure to use the product in compliance with its intended purpose, by improper use and
insufficient maintenance,
○ defects caused by mechanical damage to the product,
○ defects caused by tampering or incompetent repair.

2022 We reserve the right to errors, changes and improvements without prior notice.
REGULUS spol. s r.o.
E-mail: [email protected]
Web: www.regulus.eu
v1.0-06/2022
8 - Maintenance
If the tank is tted with a heating element, disconnect it from the mains rst. Clean the exterior of the tank with
a soft cloth and a mild detergent. Never use abrasive cleaners or solvents.
Check all connections for leaks.
The thermal stores come with an anti-corrosion sacrice magnesium anode rod as standard. The condition of
the anode rod shall be checked within 12 months after commissioning and subsequently always not later than
12 months after the last check. In locations where water contains more ferrites or calcites, it is recommended
to check the anode rod every 6 months. If more than one third of its total volume is consumed, the anode rod
shall be replaced with a new one. Disregarded of its state, the magnesium anode rod shall be always replaced
with a new one within 24 months from commissioning.
In order to replace a magnesium anode rod, decrease the pressure inside the Thermal Store to the
atmospheric value rst, then the pressure inside the hot water tank. Replace the anode rod and
pressurize the inner hot water tank rst, then pressurize the Thermal Store.
If damage to a tank occurs due to the neglected substitution or a wrong replacement procedure of
a magnesium anode rod, the warranty cannot be claimed.
9 - Disposal
Packaging shall be disposed of in compliance with the valid rules. When the product reaches the end of its
life, it shall not be disposed of as household waste. It shall be dropped off at a Local Waste Recycling Center.
Insulation shall be recycled as plastic and the steel vessel as scrap iron.
10 - Warranty
This product is covered by warranty according to the conditions described in this Manual and according to the
Warranty Certicate. A Warranty Certicate forms an integral part of the supply. Tank transport or storing in
a horizontal position is considered a warranty violation!