Regulus RDC 160 User manual

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

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1 - Description
RDC Storage water heater (further “tank“) with one enameled heating coil (e.g. for connecting a solar system
or a gas boiler), 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 157, 216, 274 and 302 l capacity enabling installation of an electric heating rod.
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. (RDC 300 - 42 mm).
The RDC 160, RDC 200 and RDC 250 models have a mantle of sheet metal, white painted. The RDC 300
tank has a surface of white PVC. Tanks are tted with 3 height-adjustable legs enabling compensation of max.
10 mm height difference.
1.4 - Connection points on the tank
2× lateral with G 3/4“ M thread, for the heating coil
2×lateral with G 3/4“ M thread, for cold water inlet and hot water outlet
1× lateral with G 1/2“ F thread for temperature sensor
1× lateral with G 3/4“ M thread, for circulation
1× upper with G 5/4“ F thread for a magnesium anode rod (RDC 300) or upper ange for a magnesium anode
rod with M8 thread (RDC 160 and RDC 200)
1× lateral with G 6/4“ F thread, for el. heating rod
1× ange for lateral inspection hole (RDC 300 only)
1.5 - Packing
Tanks are delivered standing, each on its pallet. RDC 160, RDC 200 and RDC 250 are packed in a cardboard
wrap with polystyrene lling. RDC 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 qualied 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, installa-
tion, 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 responsibil-
ity for damage caused by improper or wrong use.
3 - Operation
This tank is designed for operation in sealed 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 (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.

Dimensions
NOTE:
pos. description connection height [mm]
DHW heating
W1 cold water G 3/4" M 73
W2 hot water G 3/4" M 964
W3 recirculation G 3/4" F 647
Auxiliary heat source
E1 electric heating element G 6/4" F 547
Control and safety
C2 temperature sensor-lower G 1/2" F 411
Heat sources
X1 supply from solar thermal collectors G 3/4" M 512
X2 return to solar thermal collectors G 3/4" M 204
Others
A1 magnesium anode rod G 5/4" F 1010
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 flange
Technical data
Total tank volume 157 l
Fluid volume in tank 152 l
Heat exchanger (HE) volume 5 l
Heat exchanger surface area 0,8 m²
Max. working temperature in tank 95 °C
Max.working temperature in HE 110 °C
Max. working pressure in tank 10 bar
Max. working pressure in HE 10 bar
Tipping height 1230 mm
Empty weight 70 kg
Hot water heating from 10 °C to 45 °C at heating water inlet temp. 60 °C
Heat exchanger 320 l/h (13 kW)
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4 - Technical Data and Dimensions
code: 12772
HOT WATER STORAGE TANK
Regulus RDC 160

Dimensions
NOTE:
pos. description connection height [mm]
DHW heating
W1 cold water G 3/4" M 73
W2 hot water G 3/4" M 964
W3 recirculation G 3/4" F 647
Auxiliary heat source
E1 electric heating element G 6/4" F 547
Control and safety
C2 temperature sensor-lower G 1/2" F 411
Heat sources
X1 supply from solar thermal collectors G 3/4" M 512
X2 return to solar thermal collectors G 3/4" M 204
Others
A1 magnesium anode rod G 5/4" F 1010
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 flange
Technical data
Total tank volume 216 l
Fluid volume in tank 208 l
Heat exchanger (HE) volume 8 l
Heat exchanger surface area 1,0 m²
Max. working temperature in tank 95 °C
Max.working temperature in HE 110 °C
Max. working pressure in tank 10 bar
Max. working pressure in HE 10 bar
Tipping height 1500 mm
Empty weight 97 kg
Hot water heating from 10 °C to 45 °C at heating water inlet temp. 60 °C
Heat exchanger 400 l/h (16 kW)
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code: 12758
HOT WATER STORAGE TANK
Regulus RDC 200

Technical data
Total tank volume 274 l
Fluid volume in tank 264 l
Heat exchanger (HE) volume 10 l
Heat exchanger surface area 1,5 m²
Max. working temperature in tank 95 °C
Max.working temperature in HE 110 °C
Max. working pressure in tank 10 bar
Max. working pressure in HE 10 bar
Tipping height 1670 mm
Empty weight 97 kg
Hot water heating from 10 °C to 45 °C at heating water inlet temp. 60 °C
Heat exchanger 590 l/h (24 kW)
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code: 15860
HOT WATER STORAGE TANK
Regulus RDC 250
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 flange
Dimensions
NOTE:
pos. description connection height [mm]
DHW heating
W1 cold water G 3/4" M 74
W2 hot water G 3/4" M 1454
W3 recirculation G 3/4" F 996
Auxiliary heat source
E1 electric heating element G 6/4" F 835
Control and safety
C1 temperature sensor-upper G 1/2" F 1096
C2 temperature sensor-lower G 1/2" F 349
Heat sources
X1 supply from solar thermal collectors G 3/4" M 774
X2 return to solar thermal collectors G 3/4" M 204
Others
A1 magnesium anode rod G 5/4" F 1492

Technical data
Total tank volume 302 l
Fluid volume in tank 292 l
Heat exchanger (HE) volume 10 l
Heat exchanger surface area 1,5 m²
Max. working temperature in tank 95 °C
Max.working temperature in HE 110 °C
Max. working pressure in tank 10 bar
Max. working pressure in HE 10 bar
Tipping height 1890 mm
Empty weight 114 kg
Hot water heating from 10 °C to 45 °C at heating water inlet temp. 60 °C
Heat exchanger 590 l/h (24 kW)
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code: 12759
HOT WATER STORAGE TANK
Regulus RDC 300
Dimensions
NOTE:
pos. description connection height [mm]
DHW heating
W1 cold water G 3/4" M 74
W2 hot water G 3/4" M 1670
W3 recirculation G 3/4" F 814
Auxiliary heat source
E1 electric heating element G 6/4" F 948
Control and safety
C1 temperature sensor-upper G 1/2" F 1165
C2 temperature sensor-lower G 1/2" F 369
Heat sources
X1 supply from solar thermal collectors G 3/4" M 904
X2 return to solar thermal collectors G 3/4" M 204
Others
A1 magnesium anode rod G 5/4" F 1722
A2 magnesium anode rod G 3/4" F 249
L1 flange 8 x M10 249
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 flange

KEY
1 RDC hot water storage tank
2 CSE SOL solar pump station
3 solar expansion vessel
4 solar collectors
5 pump station for DHW recirculation – CSE TVMIX ZV
6 safety kit for HW storage tank
7 DHW expansion vessel
8 el. heating element
SV cold water
TV hot water
CV hot water recirculation
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
KEY
1 RDC hot water storage tank
2 HC expansion vessel
3 boiler (el./gas/…)
4 pump station for DHW recirculation – CSE TVMIX ZV
5 safety kit for HW storage tank
6 DHW expansion vessel
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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Example II.
With a solar thermal system and el. auxiliary heating.
Example I.
With a gas boiler.
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 600mg/l 40mg/l 100mg/l 20 mg/l 200 mg/l 0.2mg/l
5 - Typical Installation Examples

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6 - Installation and Commissioning
Installation must meet valid rules and may be done by qualied staff only. The tank shall be placed on the
oor, 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 inlet to and outlet from heating coil 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 qualied staff
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. 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 RDC 160, RDC 200 and RDC 250, 12l volume for RDC 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 RDC tanks. When installing
an electronic anode, the magnesium anode rod in the lower ange shall be removed. 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 sufcient.
Kits for RDC storage water heaters.
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
Fill the heating circuit with the appropriate uid 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 owing, lling is complete; close the
tap
- check all connections for leaks and the system pressure
For tanks El. Anode Kit code - replacement Anode rod length
RDC 160 9173 350 (200/150)
RDC 200, RDC 250 9174 500 (350/150)
RDC 300 17378 500 (350/150) + 350 (200/150)

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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 Magnesium
Anode Bar
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 tanks are equipped with an anti-corrosion sacrice 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.
RDC 160 RDC 200 RDC 250 RDC 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 replacement 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 Certicate. A Warranty Certicate is an integral part of the supply. Tank transport or storing in
a horizontal position is considered a warranty violation!

©2021 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
v1.5 - 10/2021