Regulus DUO N P Series User manual

www.regulus.eu
DUO N P
DUO N P
EN
Installation and Operation Manual
THERMAL STORES with immersed DHW tank
DUO 390/130 N P, DUO 600/200 N P, DUO 750/200 N P,
DUO 1000/200 N P, DUO 1700/200 N P

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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 of Regulus DUO N P series ................................................... 4
4 Operation ....................................................................................................................................... 6
5 Typical Installation Examples ..................................................................................................... 7
6 Tank Installation and Commissioning ......................................................................................... 9
6.1 Connection to heat sources ............................................................................................. 9
6.2 Heating element installation .............................................................................................. 9
6.3 Connection to water mains ................................................................................................ 9
6.4 Commissioning .................................................................................................................. 9
7 Installing Insulation on the Tank ................................................................................................ 10
7.1 Insulation description ........................................................................................................ 10
7.2 How to install the insulation ............................................................................................. 10
7.3 Warranty on insulation ...................................................................................................... 10
8 Maintenance ................................................................................................................................. 11
9 Disposal ........................................................................................................................................ 11
10 Warranty ...................................................................................................................................... 11

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1 - Description
DUO N P 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 thermal store shall to be
connected to a closed 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, check 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 P, DUO 600/200 N P, DUO 750/200 N P, DUO 1000/200 N P, DUO 1700/200 N P
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 increased
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
Thermal stores 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 thermal stores in a horizontal position.
2 - General Information
This 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 a qualied person
according to valid rules and Manufacturer‘s instructions.
This appliance is designed to accumulate thermal energy of heating water and distribute it subsequently. It
must be connected to a heating system and heat sources. This appliance is suitable also for storage hot water
heating.
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.
Prior to lling the thermal store, ll and pressurize the inner DHW tank rst!!!

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3 - Technical Data and Dimensions of
Regulus DUO N P series
Regulus DUO 390/130 N P Thermal Store
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 1210
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 Flow to heating system G 1“ F/4 1780
H2 Return from heating system G 1“ F/4 1210
Electric heating elements
E1
Electric heating element for space heating G 6/4“ F 1720
E2
Electric heating element for space heating G 6/4“ F 1720
E3
Electric heating element for DHW heating G 6/4“ F 1980
E4
Electric heating element for PV system G 6/4“ F 1270
DHW heating
W1 Cold water G 1“ M41910
W2 Hot water G 1“ M41910
W3 Circulation G 1“ M41910
N Anode G 1“ F 1810
Control and safety
C1 Temperature sensor – space heating G 1/2“ F 1750
C2 Temperature sensor – DHW heating G 1/2“ F 1510
C3 Temperature sensor – DHW heating G 1/2“ F 1160
C4 Temperature sensor – DHW heating G 1/2“ F 1020
T2Thermometer G 1/2“ F 1630
M2Manometer G 1/2“ F 1510
P2Safety valve G 1/2“ F 1400
Air release
O2Air vent valve G 1/2“ F 1885
DUO 390/130 N P
Code - tank 19131
Code - insulation 19318
Standing loss 87 W
Total tank volume 396 l
Fluid volume in tank 273 l
Volume of immersed DHW tank 123 l
Max. working temperature in tank 95 °C
Max. working temperature in DHW tank 95 °C
Max. working pressure in tank 3 bar
Max. working pressure in DHW tank 6 bar
Tank diameter 550 mm
Tank diameter with insulation 750 mm
Tank overall height 1910 mm
Tipping height without insulation 1950 mm
Empty weight 102 kg
Electric heating element models ETT-C, F, M, P
Number and max. length of heating elements 4 x 500 mm
DUO 390/130 N P

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Regulus DUO 600/200 N P, 750/200 N P, 1000/200N P, 1700/200 N P Thermal Stores
DUO 600/200 N P DUO 750/200 N P DUO 1000/200 N P DUO 1700/200 N P
pos. connection height [mm]
Heat sources
B1 G 6/4"F 985 960 1115 1150
B2 G 6/4“F 235 255 300 335
B3 G 6/4"F 1635 1655 1700 1675
B4 G 6/4"F 1090 1065 1220 1255
B5 G 1"F 1570 1590 1635 1610
B6 G 6/4"F 660 635 785 820
Heating system
H1 G 1"F 1030 1005 1160 1195
H2 G 1"F 225 245 290 325
Electric heating elements
E1 G 6/4"F 890 865 1020 1055
E2 G 6/4"F 890 865 1020 1055
E3 G 6/4"F 1180 1055 1310 1295
E4 G 6/4"F 235 255 300 335
DHW heating
W1 G 1"M 1935 1980 2080 2080
W2 G 1"M 1935 1980 2080 2080
W3 G 1“M 1935 1980 2080 2080
A1 G 1“F 1935 1980 1980 1980
Control and safety
C1 G 1/2"F 1000 975 1130 1165
C2 G 1/2"F 625 615 740 775
C3 G 1/2"F 1310 1285 1440 1425
C4 G 1/2"F 1220 1195 1350 1335
TG 1/2"F 1635 1655 1700 1675
MG 1/2"F 510 510 510 510
PG 1/2"F 400 400 400 400
Air release
OG 1/2"F 1915 1960 2060 2060
DUO 600/200 N P DUO 750/200 N P DUO 1000/200 N P DUO 1700/200 N P
Code - tank 19147 19141 19143 19137
Code - insulation 19330 19333 19334 19354
Standing loss 102 W 118 W 130 W 175 W
Total tank volume 559 l 757 l 903 l 1682 l
Fluid volume in tank 385 l 583 l 729 l 1508 l
Volume of immersed DHW tank 174 l 174 l 174 l 174 l
Max. working temperature in tank 95 °C 95 °C 95 °C 95 °C
Max. working temperature in DHW tank 95 °C 95 °C 95 °C 95 °C
Max. working pressure in tank 3 bar 3 bar 3 bar 3 bar
Max. working pressure in DHW tank 6 bar 6 bar 6 bar 6 bar
Tank diameter 650 mm 750 mm 800 mm 1100 mm
Tank diameter with insulation 850 mm 950 mm 1000 mm 1300 mm
Tank overall height 1935 mm 1980 mm 2080 mm 2080 mm
Tipping height without insulation 1970 mm 2040 mm 2120 mm 2200 mm
Empty weight 126 kg 147 kg 167 kg 225 kg
Electric heating element type ETT-C, F, M, P
Number and max. length of heating elements 4 x 500 mm 4 x 650 mm 4 x 720 mm 4 x 1050 mm
Průměr nádrže s izolací
Průměr nádrže
Celková výška
Tank diameter with insulation
Tank diameter
Overall height

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4 - Operation
This tank is designed to accumulate thermal energy in household or industrial applications, however always in
closed 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.

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5 - Typical Installation Examples
Variant 1: RegulusBOX with heat pump
KEY 1 – Regulus heat pump (RTC, CTC) 2 – heating system expansion vessel 3 – zone valve for DHW heating from HP 4 – Regulus DUO xx N P thermal store 5 – collector/manifold, HV 60/125-2 6 – pump station for heating system 2 - CSE2 MIX 7 – pump station for heating system 1 - CSE2 8 – pump station for DHW recirculation – CSE TVMIX ZV 9 – safety kit for HW storage tank 10 – DHW expansion vessel 11 – RegulusBOX indoor unit 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

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Variant 2: Heat pump with hydronic replace insert and el. heating elements
KEY 1 – Regulus heat pump (RTC, CTC) 2 – heating system expansion vessel 3 – el. heating elements for space heating 4 – Regulus DUO xx N P thermal store 5 – RGMAT E load unit 6 – replace insert (stove) w. hydronic heat exchanger 7 – pump station for heating system 2 - CSE2 MIX 8 – pump station for heating system 1 - CSE2 9 – collector/manifold, HV 60/125-2 10 – pump station for DHW recirculation – CSE TVMIX ZV 11 – safety kit for HW storage tank 12 – DHW expansion vessel 13 – el. heating element for DHW 14 – zone valves for DHW heating from HP 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 - Tank Installation and Commissioning
Installation must meet valid rules and may be done only by qualied staff.
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.
The electric heating element shall be wired by a professionally qualied person only.
Defects caused by improper installation, use or handling are not covered by warranty.
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 - 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 elements
shall be wired by a professionally qualied person only.
Warning: Electric heating elements shall be protected by a safety thermostat.
6.3 - Connection to water mains
The connection to the tank, including the ttings, is shown in the diagram of the recommended connections
in Chap. 5. DHW piping shall be done according to valid rules. 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 with
a minimum volume of 4% of the total volume of water in the DHW piping, including heat exchangers, circulation
pipes, etc. (usually 8 l). Installation of an expansion vessel is one of the necessary conditions of the extended
warranty. Should the water be too hard, install a water softener upstream of the tank. In case the water contains
mechanical impurities, install a lter.
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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6.4 - 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 depends
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. 6.3.
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.

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7 - Installing Insulation on the Tank
7.1 - Insulation description
Thermal insulation is part of the thermal store to prevent its heat loss. Insulation for this type of thermal store is
installed only at the place of the thermal store installation for easier handling.
Warning
Insulation installation shall be done in two persons. Do not use any tools for installation. Keep away from open fire.
7.2 - How to install the 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 centre 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.
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
7.3 - 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.

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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.
When replacing the magnesium anode rod, rst reduce the pressure in the thermal store to atmospheric
pressure, then reduce the pressure in the DHW tank. Replace the anode rod and pressurize the DHW
tank, then pressurize the thermal store.
If the tank gets damaged due to neglected replacement or wrong replacement procedure of the
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
Transporting and/or storing the thermal store in a horizontal position is considered a breach of warranty
conditions!

©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
v1.0-04/2022