STORAGE WATER HEATERS
RDC 160, RDC 200 and RDC 300
EN
v. 1.1
Installation and Operation Instructions
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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
Three models of 152, 200 and 297 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 50 mm thick. (RDC 160 - 42 mm).
The RDC 160 and RDC 200 models have a mantle of sheet metal, white painted. The RDC 300 tank has a
surface of white PS. Tanks are fitted with 3 height-adjustable legs enabling compensation of max. 10 mm
height difference.
1.4 - Connection points on the tank
2× lateral with G 1“ F thread, for the heating coil
2×lateral with G 3/4“ F 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“ F thread, for circulation
1× upper with G 5/4“ F thread for a magnesium anode rod (RDC 300) or upper flange 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× flange for lateral inspection hole (RDC 300 only)
1.5 - Packing
Tanks are delivered standing, each on its pallet. RDC 160 and RDC 200 are packed in a cardboard wrap with
polystyrene filling. 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 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 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.
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4 - Technical Data and Dimensions
Total fluid volume in tank .................................................................... 152 l
Tank volume ....................................................................................... 147 l
Heat exchanger volume ..................................................................... 5.0 l
Heat exchanger surface area ............................................................. 0.8 m
2
Max. working temperature in tank ...................................................... 95 °C
Max. working temperature in heat exchanger .................................... 110 °C
Max. working pressure in tank ............................................................ 10 bar
Max. working pressure in heat exchanger .......................................... 10 bar
DHW heating from 10 °C to 45 °C at heating water temp. of 60 °C ... 545 l/h (19 kW)
Empty weight ...................................................................................... 70 kg
Storage water heater
code
Anode rod
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Total fluid volume in tank .................................................................... 220 l
Tank volume ....................................................................................... 213 l
Heat exchanger volume ..................................................................... 7.0 l
Heat exchanger surface area ............................................................. 1.0 m
2
Max. working temperature in tank ...................................................... 95 °C
Max. working temperature in heat exchanger .................................... 110 °C
Max. working pressure in tank ............................................................ 10 bar
Max. working pressure in heat exchanger .......................................... 10 bar
DHW heating from 10 °C to 45 °C at heating water temp. of 60 °C ... 590 l/h (24 kW)
Empty weight ...................................................................................... 97 kg
Storage water heater
code
Anode rod
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EGULUS - STORAGE WATER HEATERS RDC - www.regulus.e
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Total fluid volume in tank .................................................................... 297 l
Tank volume ....................................................................................... 287 l
Heat exchanger volume ..................................................................... 10.0 l
Heat exchanger surface area ............................................................. 1.5 m
2
Max. working temperature in tank ...................................................... 95 °C
Max. working temperature in heat exchanger .................................... 110 °C
Max. working pressure in tank ............................................................ 10 bar
Max. working pressure in heat exchanger .......................................... 10 bar
DHW heating from 10 °C to 45 °C at heating water temp. of 60 °C ... 860 l/h (35 kW)
Empty weight ...................................................................................... 114 kg
Anode rod
Storage water heater
code
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EGULUS - STORAGE WATER HEATERS RDC - www.regulus.e
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Example II.
With a solar system and el. backup heating.
HW
CW
RDC
recirc.
E
bbb
bbb
bbbbbbb
bbb
B
T
E
Example I.
With a gas boiler.
HW
CW
RDC
heating system
3-way
zone
valve
recirc.
E
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 - 9.5 600 mg/l 40 mg/l 100 mg/l 20 mg/l 200 mg/l 0.2 mg/l
5 - Typical Installation Examples
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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 inlet to and outlet from heating coil using G 1” 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 1” 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: 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 and RDC 200, 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 300 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. RDC 160 and RDC 200 tanks are not designed for use of an
electronic anode rod.
The electronic anode kit mounts in place of the magnesium one. In order to install (replace) the electronic anode rod, a space is needed between the tank top and ceiling that corresponds to the anode rod length shown
in the table below. In order to protect the tank properly and meet its warranty conditions, the anode from the
table below shall be used.
Kit for RDC 300 storage water heater.
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 fluid 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
Code Anode rod length [mm] For tanks
9174 500 (350/150) RDC 300
1/2014
REGULUS spol. s r.o.
Do Koutů 1897/3 http://www.regulus.eu
143 00 Praha 4 E-mail: sales@regulus.cz
CZECH REPUBLIC
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EGULUS - STORAGE WATER HEATERS RDC - www.regulus.e
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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 6 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 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. In case an electronic anode is used (RDC 300), 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 Certificate. A Warranty Certificate is an integral part of the supply. Tank transport or storing in a
horizontal position is considered a warranty violation!
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