Regulus Rdc 160 Hot Water Storage Tank Instruction Manual (+ PDF)

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RDC 160 Hot Water Storage Tank

Product Information

The RDC 160 – 300 is a range of hot water storage tanks
manufactured by Regulus. These tanks are designed for use with
various heating sources such as solar systems or gas boilers. They
come in four different models with capacities of 157, 216, 274, and
302 liters. The tanks are equipped with an enameled heating coil
and can also accommodate an electric heating element. The inner
surface and coils are coated with enamel for durability, and a
magnesium anode rod is installed inside the tank for additional
protection. The tanks are well-insulated with a CFC-free hard
polyurethane insulation that is 42mm thick (RDC 300 has 42mm
insulation). The RDC 160, RDC 200, and RDC 250 models have a
white-painted sheet metal mantle, while the RDC 300 tank has a
white PVC surface. The tanks are supplied with three
height-adjustable legs to compensate for up to 10mm of height
difference.

Product Usage Instructions

Ensure the tank is installed by a qualified person according to
the manufacturer’s instructions and valid rules.
Read the owner’s manual carefully as it contains important
information regarding safety, installation, operation, and
maintenance. Keep the manual for future reference.
Do not use the tank for purposes other than what it is designed
for. Improper or wrong use may cause damage, and the manufacturer
will not be responsible for any resulting damage.
Design the hydraulics of the entire system, including the
position of circulation pumps, valves, non-return valves, etc., to
ensure proper working of the tank.
Connect the tank to a suitable heating source such as a solar
system or gas boiler using the provided connections on the
tank.
If desired, install an electric heating element in the
tank.
Ensure the tank is properly insulated and positioned to
compensate for any height differences using the adjustable
legs.
Follow the technical data provided in the manual for
information on tank volume, heat exchanger volume, maximum working
temperatures, and pressures.
Do not transport or store the tank in a horizontal
position.

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RDC 160 – 300

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Installation and Operation Manual EN
HOT WATER STORAGE TANKS RDC 160, RDC 200, RDC 250 and RDC 300
RDC 160 – 300

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 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 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 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, RDC 200 and RDC 250 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

HOT WATER STORAGE TANK Regulus RDC 160
code: 12772

Dimensions

pos. description

connection height [mm]

DHW heating W1 cold water W2 hot water W3 recirculation Auxiliary heat source E1 electric heating element Control and safety C2 temperature sensor-lower Heat sources X1 supply from solar thermal collectors X2 return to solar thermal collectors Others A1 magnesium anode rod

G 3/4″ M G 3/4″ M G 3/4″ F
G 6/4″ F
G 1/2″ F
G 3/4″ M G 3/4″ M
G 5/4″ F

73 964 647
547
411
512 204
1010

NOTE:
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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HOT WATER STORAGE TANK Regulus RDC 200
code: 12758

Dimensions

pos. description

connection height [mm]

G 3/4″ M G 3/4″ M G 3/4″ F
G 6/4″ F
G 1/2″ F
G 3/4″ M G 3/4″ M
G 5/4″ F

73 964 647
547
411
512 204
1010

NOTE:
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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HOT WATER STORAGE TANK Regulus RDC 250
code: 15860

Dimensions

pos. description

connection height [mm]

DHW heating W1 cold water W2 hot water W3 recirculation Auxiliary heat source E1 electric heating element Control and safety C1 temperature sensor-upper C2 temperature sensor-lower Heat sources X1 supply from solar thermal collectors X2 return to solar thermal collectors Others A1 magnesium anode rod

G 3/4″ M G 3/4″ M G 3/4″ F
G 6/4″ F
G 1/2″ F G 1/2″ F
G 3/4″ M G 3/4″ M
G 5/4″ F

74 1454
996
835
1096 349
774 204
1492

NOTE:
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

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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HOT WATER STORAGE TANK Regulus RDC 300

code: 12759

Dimensions

pos. description

connection height [mm]

G 3/4″ M G 3/4″ M G 3/4″ F
G 6/4″ F
G 1/2″ F G 1/2″ F
G 3/4″ M G 3/4″ M
G 5/4″ F G 3/4″ F 8 x M10

74 1670
814
948
1165 369
904 204
1722 249 249

NOTE:
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

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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Table of limit values for total dissolved solids in hot water

Description Max. value

pH Total dissolved solids (TDS)
6.5 – 9.5 600 mg/l

Ca 40 mg/l

Chlorides 100 mg/l

Mg 20 mg/l

Na 200 mg/l

Fe 0.2 mg/l

5 – Typical Installation Examples

Example I. With a gas boiler.

KEY
1 2 3 4 5 6

RDC hot water storage tank HC expansion vessel boiler (el./gas/…) pump station for DHW recirculation CSE TVMIX ZV safety kit for HW storage tank DHW expansion vessel

cold water

hot water

hot water recirculation

ÚT

central heating (heating system)

KK ZV AOV PTR REDV VK SVE PV-ÚT MFB

ball valve check valve automatic air vent valve pressure temperature relief valve pressure reducing valve (optional) drain valve expansion vessel service valve HC safety valve Magnet Filterball

Example II. With a solar thermal system and el. auxiliary heating.

KEY
1 2 3 4 5 6 7 8

RDC hot water storage tank CSE SOL solar pump station solar expansion vessel solar collectors pump station for DHW recirculation CSE TVMIX ZV safety kit for HW storage tank DHW expansion vessel el. heating element

cold water

hot water

hot water recirculation

KK ZV AOV PTR REDV VK SVE

ball valve check valve automatic air vent valve pressure temperature relief valve pressure reducing valve (optional) drain valve expansion vessel service valve

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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 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: 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 flange 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 sufficient.
Kits for RDC storage water heaters.

For tanks

El. Anode Kit code – replacement

Anode rod length

RDC 160 RDC 200, RDC 250 RDC 300

9173 9174 17378

350 (200/150) 500 (350/150) 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 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

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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 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.

Magnesium anode rod (code) Magnesium anode rod with upper flange and gasket (code) Magnesium anode rod for the lower flange (code)

RDC 160 4025 15846 –

RDC 200 448
15847 –

RDC 250 448
15847 –

RDC 300 448 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 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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©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

v1.5 – 01/2023