Regulus R2DC 200 User manual

www.regulus.eu
R2DC 160 - 300
R2DC 160 - 300
EN
Installation and Operation Manual
HOT WATER STORAGE TANKS
R2DC 160, R2DC 200, R2DC 250 and R2DC 300

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1 - Description
R2DC Storage water heater (further “tank“) with two enameled heating coils (e.g. for connecting a solar sys-
tem and a heat pump), enabling installation of an electric heating element.
In order to reach proper working of the tank, it is necessary to design optimum hydraulics of the whole system,
i.e. position of circulation pumps for sources and heating circuits, valves, non-return valves etc.
1.1 - Models
Four models of 153, 216, 260 and 293 l total capacity enabling installation of an electric heating rod or another
heat source.
1.2 - Tank protection
Enamel on the inner surface and on coils guarantees a long service life. Further qualitative improvement is
ensured by a magnesium anode rod installed inside the tank.
1.3 - Thermal insulation
Tanks are supplied with a CFC-free hard polyurethane insulation 42 mm thick (R2DC 300 - 48.5 mm thick).
R2DC 160, 200 and 250 models have a mantle of sheet metal, white painted. The R2DC 300 model has a
white PVC surface. Tanks are fitted with 3 height-adjustable legs enabling compensation of max. 10 mm hei-
ght difference.
1.4 - Connection points on the tank
4× lateral with G 3/4“ M thread, for the heating coils
2× lateral with G 3/4“ M (R2DC 160 - G 3/4“ F) thread, for cold water inlet and hot water outlet
2× lateral with G 1/2“ inner thread for temperature probes
1× lateral with G 3/4“ outer thread (R2DC 160 - G 3/4“ F), for circulation
1× upper with G 5/4“ inner thread, for magnesium anode rod
1× with G 6/4“ inner thread, for el. heating rod
1× flange for lateral inspection hole (R2DC 300 only)
1.5 - Packing
Tanks are delivered standing, each on its pallet, R2DC 160, R2DC 200 and R2DC 250 are packed in a card-
board wrap with polystyrene filling. R2DC 300 is screwed to its pallet, wrapped in foil and protected by a cage
of wooden laths. The tanks shall not be transported/stored in a horizontal position.
2 - General Information
The appliance shall be installed by a qualified person according to valid rules and Manufacturer‘s Instructions.
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.
Using the tank for other purposes than stated above is forbidden and the manufacturer accepts no
responsibility for damage caused by improper or wrong use.
3 - Operation
This tank is designed for operation in closed pressure circuits. Hot water is heated in the integrated hot-water
heat exchangers (heating coils) inside the tank by several possible heat sources like various kinds of hydronic
boilers, renewable energy sources (heat pumps, solar collectors). An electric heating rod can be installed into
the tank for DHW backup heating.
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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4 - Technical Data and Dimensions
Regulus R2DC 160
Total tank volume: ................................................................ 153 l
DHW volume in tank: ........................................................... 144 l
Upper heating coil volume: .................................................. 4.0 l
Lower heating coil volume: .................................................. 5.0 l
Upper heating coil surface area: .......................................... 0.7 m2
Lower heating coil surface area: .......................................... 0.8 m2
Max. working temperature of the tank: ................................ 95 °C
Max. working temperature of the heat exchanger: .............. 110 °C
Max. working pressure of the tank: ...................................... 10 bar
Max. working pressure of the heat exchanger: .................... 10 bar
Tipping height: ..................................................................... 1230 mm
DHW heating Δt=35 °C (80/60 - 10/45) - upper heating coil: ..... 270 (11) l/h (kW)
DHW heating Δt=35 °C (80/60 - 10/45) - lower heating coil....... 320 (13) l/h (kW)
Empty weight: ...................................................................... 76 kg
code: 13490
Dimensions
pos. description
height
[mm]
W1 cold water G 3/4" M 73
W2 hot water G 3/4" M 964
W3 recirculation G 3/4" F 647
E1 electric heating element G 6/4" F 547
C1 temperature sensor-upper G 1/2" F 734
C2 temperature sensor-lower G 1/2" F 411
X1 supply from heat source G 3/4" M 835
X2 return to heat source G 3/4" M 572
X3 supply from solar thermal collectors G 3/4" M 512
X4 return to solar thermal collectors G 3/4" M 204
A1 magnesium anode rod G 5/4" F 1010
-
Control and safety
Heat sources
Others
Auxiliary heat source
DHW heating
1) C1 and C2 tappings are supplied incl. adapter G 1/2" M - M12x1.5 and cable gland
2) earthing metal strip is run through the insulation next to the upper part of the DHW tank
connection

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Total tank volume: ................................................................ 216 l
DHW volume in tank: ........................................................... 200 l
Upper heating coil volume: .................................................. 8.0 l
Lower heating coil volume: .................................................. 8.0 l
Upper heating coil surface area: .......................................... 1.0 m2
Lower heating coil surface area: .......................................... 1.0 m2
Max. working temperature of the tank: ................................ 95 °C
Max. working temperature of the heat exchanger: .............. 110 °C
Max. working pressure of the tank: ...................................... 10 bar
Max. working pressure of the heat exchanger: .................... 10 bar
Tipping height: ...................................................................... 1500 mm
DHW heating Δt=35 °C (80/60 - 10/45) - upper heating coil: ..... 400 (16) l/h (kW)
DHW heating Δt=35 °C (80/60 - 10/45) - lower heating coil....... 400 (16) l/h (kW)
Empty weight: ....................................................................... 105 kg
Dimensions
pos. description height
[mm]
W1 cold water G 3/4" M 74
W2 hot water G 3/4" M 1274
W3 recirculation G 3/4" F 816
E1 electric heating element G 6/4" F 684
C1 temperature sensor-upper G 1/2" F 916
C2 temperature sensor-lower G 1/2" F 351
X1 supply from heat source G 3/4" M 1144
X2 return to heat source G 3/4" M 704
X3 supply from solar thermal collectors G 3/4" M 644
X4 return to solar thermal collectors G 3/4" M 204
A1 magnesium anode rod G 5/4" F 1334
A2 magnesium anode rod G 3/4" F -
Control and safety
Heat sources
Others
Auxiliary heat source
DHW heating
1) C1 and C2 tappings are supplied incl. adapter G 1/2" M - M12x1.5 and cable gland
2) earthing metal strip is run through the insulation next to the upper part of the DHW tank
connection
Regulus R2DC 200
code: 11351

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Total tank volume: ................................................................ 260 l
DHW volume in tank: ........................................................... 242 l
Upper heating coil volume: .................................................. 8.0 l
Lower heating coil volume: .................................................. 10.0 l
Upper heating coil surface area: .......................................... 1.0 m2
Lower heating coil surface area: .......................................... 1.2 m2
Max. working temperature of the tank: ................................ 95 °C
Max. working temperature of the heat exchanger: .............. 110 °C
Max. working pressure of the tank: ...................................... 10 bar
Max. working pressure of the heat exchanger: .................... 10 bar
Tipping height: ...................................................................... 1670 mm
DHW heating Δt=35 °C (80/60 - 10/45) - upper heating coil: ..... 400 (16) l/h (kW)
DHW heating Δt=35 °C (80/60 - 10/45) - lower heating coil....... 470 (19) l/h (kW)
Empty weight: ...................................................................... 120 kg
Dimensions
pos. description height
[mm]
W1 cold water G 3/4" M 74
W2 hot water G 3/4" M 1454
W3 recirculation G 3/4" F 996
E1 electric heating element G 6/4" F 835
C1 temperature sensor-upper G 1/2" F 1096
C2 temperature sensor-lower G 1/2" F 349
X1 supply from heat source G 3/4" M 1324
X2 return to heat source G 3/4" M 884
X3 supply from solar thermal collectors G 3/4" M 774
X4 return to solar thermal collectors G 3/4" M 204
A1 magnesium anode rod G 5/4" F 1492
Control and safety
Heat sources
Others
Auxiliary heat source
DHW heating
1) C1 and C2 tappings are supplied incl. adapter G 1/2" M - M12x1.5 and cable gland
2) earthing metal strip is run through the insulation next to the upper part of the DHW tank
connection
Regulus R2DC 250
code: 20039

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Total tank volume: ................................................................ 293 l
DHW volume in tank: ........................................................... 275 l
Upper heating coil volume: .................................................. 8.0 l
Lower heating coil volume: .................................................. 10.0 l
Upper heating coil surface area: .......................................... 1.0 m2
Lower heating coil surface area: .......................................... 1.5 m2
Max. working temperature of the tank: ................................ 95 °C
Max. working temperature of the heat exchanger: .............. 110 °C
Max. working pressure of the tank: ...................................... 10 bar
Max. working pressure of the heat exchanger: .................... 10 bar
Tipping height: ...................................................................... 1860 mm
DHW heating Δt=35 °C (80/60 - 10/45) - upper heating coil: ..... 400 (16) l/h (kW)
DHW heating Δt=35 °C (80/60 - 10/45) - lower heating coil....... 590 (24) l/h (kW)
Empty weight: ...................................................................... 125 kg
Dimensions
pos. description height
[mm]
W1 cold water G 3/4" M 74
W2 hot water G 3/4" M 1674
W3 recirculation G 3/4" F 814
E1 electric heating element G 6/4" F 948
C1 temperature sensor-upper G 1/2" F 1165
C2 temperature sensor-lower G 1/2" F 369
X1 supply from heat source G 3/4" M 1454
X2 return to heat source G 3/4" M 1014
X3 supply from solar thermal collectors G 3/4" M 904
X4 return to solar thermal collectors G 3/4" M 204
L1 flange 8 x M10 249
A1 magnesium anode rod G 5/4" F 1722
A2 magnesium anode rod G 3/4" F 249
Control and safety
Heat sources
Others
Auxiliary heat source
DHW heating
1) C1 and C2 tappings are supplied incl. adapter G 1/2" M - M12x1.5 and cable gland
2) earthing metal strip is run through the insulation next to the upper part of the DHW tank
T temperature indicator – 1450
connection
Regulus R2DC 300
code: 11352

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Example
gas boiler and solar system
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 40mg/l 100mg/l 20 mg/l 200 mg/l 0,2mg/l
5 - Typical Installation Example
KEY
1 R2DC hot water storage tank
2 HC expansion vessel
3 CSE SOL solar pump station
4 solar expansion vessel
5 solar collectors
6 boiler (el./gas/…)
7 pump station for DHW recirculation – CSE TVMIX ZV
8 safety kit for HW storage tank
9 DHW expansion vessel
10 el. heating element (optional)
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 HC safety valve
MFB Magnet Filterball

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6 - Installation and Commissioning
Installation must meet valid rules and may be done by qualified staff only. The tank shall be placed on the
floor, as close to the heat source as possible.
Warning: Defects caused by improper installation, use or handling are not covered by warranty.
6.1 - Connection to heat sources
Connect the heating circuits to the inlets to and outlets from heating coils. The heat source for the tank - 2
enameled coils - connect using G 3/4” nipples.
6.2 - Connection to a solar 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 system shall be connected to the G 3/4” upper sleeve of the heating coil and the lower outlet to the return
piping to the solar system. Insulate all the piping between the tank and the solar system.
6.3 - Heating rod installation
The G 6/4“ side sleeve is designed to accommodate an electric heating rod. Heating rods of output up to
6 kW can be used (depending on the tank diameter and rod length), connected either directly to the mains
(thermostat-equipped rods), or to a heating system controller. The installation may be done by qualified staff
only.
Warning: 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. G 3/4” threaded couplers are used to connect the tank to
a cold water inlet and hot water outlet. A 6bar safety valve shall be installed at the cold water inlet, installation
of a reducing valve is recommended. If the pressure from water mains exceeds 6 bar, a reducing valve is
necessary. In order to prevent water loss, an expansion tank should be installed at the cold water inlet as well
(8l volume for R2DC 160, R2DC 200 and R2DC 250, 12l volume for R2DC 300).
Should the water be too hard, install a water softener before the tank. In case the water contains mechanical
impurities, install a strainer.
A suitable thermostatic mixing valve should be installed at the hot-water outlet from the tank, preventing too
hot water from entering the taps.
Install a drain valve to the lowest point of the tank.
Complete DHW piping shall be properly insulated.
6.5 - Electronic anode rod installation
A so called electronic anode rod can be used instead of the magnesium one for R2DC tanks. Its principle
advantage is that it doesn’t need to be taken out for function check. In this case, just visual check of the
electronic anode indication lamp is sufficient.
Kits for R2DC hot water storage tanks.
For tanks El. Anode Kit code - replacement Anode rod length
R2DC 160 9173 350 (200/150)
R2DC 200, R2DC 250 9174 500 (350/150)
R2DC 300 17378 500 (350/150) + 350 (200/150)
Should an electronic anode rod or ran electric heating rod be installed, an interconnection shall be done, i.e.
the metal mantle of the storage tank shall be wired to the protective neutral.
6.6 - Commissioning
Ground the tank before commissioning.
Fill the heating circuits with the appropriate fluids and air-bleed the entire system.
Fill the tank with cold water following this sequence:
- open the shut-off valve at the tank inlet
- open the hot water tap/outlet point, as soon as hot water starts flowing, filling is complete; close the tap
- check all connections for leaks and the system pressure

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Hot water quality must meet the conditions shown in the Table of limit values for total dissolved solids
in hot water, page 7 of this Manual.
Set the heating controller in compliance with the documentation and manufacturer’s recommendations. Check
regularly a proper function of all control and adjusting elements.
7 - Maintenance, Replacement of Magnesi-
um Anode Bar
If the tank is fitted with a heating element, disconnect it from the mains first. 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 tanks are equipped with an anti-corrosion sacrifice magnesium anode rod. 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 every 6 months. If more than 1/3 of its total volume is consumed, the anode shall be replaced with
a new one. Disregarded of its state, the anode rod shall be replaced with a new one within 24 months from
commissioning.
R2DC 160 R2DC 200 R2DC 250 R2DC 300
Magnesium anode rod (code) 4025 448 448 448
Magnesium anode rod with upper ange and gasket (code) 15846 15847 15847 -
Magnesium anode rod for the lower ange (code) - - - 1998
In case an electronic anode is used, the above described procedures are not necessary. Then only a visual
check of the indication lamp is necessary every 3 months. Proper working of the Electronic Anode Rod is
described in its Installation Manual.
If damage to a tank occurs due to neglected substitution of a magnesium anode rod or a non-working
electronic anode, the warranty cannot be claimed.
8 - Disposal
Packing 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.
9 - Warranty
This product is covered by warranty according to the conditions described in this Manual and according to
the Warranty Certificate. A Warranty Certificate is an integral part of the supply. Tank transport or storing in
a horizontal position is considered a warranty violation!

©2023 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
v1.6-03/2023