Regulus R2GC 250 User manual

R2GC 200, R2GC 250, R2GC 300, R2GC 400

STORAGE WATER HEATERS

v. 1.1

Users Manual

Date of manufacture: ...................................

Serial number: .............................................

Checked by: ................................................

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CONTENTS

1 Description ......................................................................................................................................... 3

1.1 Model line ............................................................................................................................. 3

1.2 Tank protection ..................................................................................................................... 3

1.3 Thermal insulation ................................................................................................................ 3

1.4 Connection points ................................................................................................................ 3

1.5 Packing ................................................................................................................................ 3

2 General Information ........................................................................................................................... 3

3 Technical Data and Dimensions of R2GC Tanks ............................................................................. 4

4 Operation ............................................................................................................................................ 5

5 Examples of Assigning Connection Points ..................................................................................... 5

6 Installation and Commissioning ....................................................................................................... 7

6.1 Connection to heat sources ................................................................................................. 7

6.2 Connection to a solar system ............................................................................................... 7

6.3 Heating rod installation ......................................................................................................... 7

6.4 Connection to water mains ................................................................................................... 7

6.5 Electronic anode installation ................................................................................................ 7

6.6 Commissioning ..................................................................................................................... 8

7 Maintenance, Replacement of Magnesium Anode Bar ................................................................... 8

8 Disposal .............................................................................................................................................. 8

9 Warranty .............................................................................................................................................. 8

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1 - Description

R2GC storage water heater (“tank” further on) is designed to accumulate heat for domestic hot water (DHW).

The tank is heated from hot-water heat exchangers installed inside (2 heating coils). The lower heating coil

can be used to connect e.g. a solar system while the upper heating coil can be fed from e.g. a gas-ﬁred boiler

or an accumulation tank. The speed of heating up the tank to the desired temperature depends primarily on

the ﬂuid temperature entering the heat exchanger. Higher temperatures of the incoming ﬂuid mean quicker

heating up the tank, and vice versa. Should the output of the heat exchanger be insufﬁcient for some applica-

tions, an electric heating rod can be installed into the tank.

The entire hydraulics of a heating system shall be designed properly in order to achieve ﬂawless operation of

the tank, i.e. the position of circulation pumps for heat sources and heating circuits, valves, check valves etc.

1.1 - Model line

These storage water heaters are supplied in four sizes: 200, 250, 300 and 400 l.

1.2 - Tank protection

The tank body is made of sheet steel, ﬁnished outside with durable ecologic powder coating. Its inner enamel

lining works as anticorrosion protection and together with a magnesium anode rod it guarantees a long serv-

ice life. The magnesium anode rod shall be inspected regularly - see point 7. Maintenance, Replacement of

Magnesium Anode Rod. An electronic anode can be also used; its lifetime covers the lifetime of the tank if its

operation indicator works right.

1.3 - Thermal insulation

Tanks are insulated with ecologic 55 mm PUR foam (50 mm for R2GC 400) that reduces thermal loss to mini-

mum.

1.4 - Connection points

4× lateral, G 1“ female thread, for heating coils

2× lateral, G 1“ female thread, cold water in, hot water out

2× lateral, G 1/2“ female thread, for temperature probes

1× lateral, G 3/4“ female thread, for recirculation

1× upper, G 5/4“, for magnesium anode rod

1× lateral, G 6/4“ female thread, for electric heating rod

1× lateral, G 1/2“ female thread, for thermometer

1.5 - Packing

Tanks are delivered standing, each screwed to its pallet, shrink-wrapped. It is forbidden to transport and/or

store the storage tanks in a horizontal position.

2 - General Info

The appliance shall be installed by a qualiﬁed person according to valid rules.

This Users 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 storage water heater for other purposes than above described is forbidden and the manufacturer

accepts no responsibility for damage caused by improper or wrong use.

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3 - Technical Data and Dimensions of R2GC Tanks

Units R2GC 200 R2GC 250 R2GC 300 R2GC 400

Volume [l] 200 250 300 400

Cold water inlet max. pressure [MPa] 0.6 0.6 0.6 0.6

Max. working temperature [°C] 100 100 100 100

Lower heating coil surface [m2] 1 1.2 1.4 1.8

Lower heating coil volume [l] 5.5 6.6 8.6 11.5

DHW heating Δt=35 °C (80/60 - 10/45) - lower heating coil [kW] 34.6 41.5 48.5 62.3

Flow rate [l/h] 850 1020 1190 1540

Upper heating coil surface [m2] 0.7 1.0 1.1 1.3

Upper heating coil volume [l] 4.5 5.5 6.4 7.4

DHW heating Δt=35 °C (80/60 - 10/45) - upper heating coil [kW] 24.2 34.6 38.1 45

Flow rate [l/h] 600 850 940 1110

Heating water needed [m3/h] 2.7 2.85 3.0 3.0

h1 [mm] 210 130 210 240

h2 [mm] 290 210 290 320

h3 [mm] 400 355 440 570

h4 [mm] 570 520 580 770

h5 [mm] 500 620 760 870

h6 [mm] 570 680 780 900

h7 [mm] 640 740 845 980

h8 [mm] 710 910 1015 1150

h9 [mm] 820 1080 1090 1330

h10 [mm] 830 1010 1170 1310

h11 [mm] 900 1170 1260 1410

L[mm] 1140 1300 1450 1660

D[mm] 660 660 660 700

Weight [kg] 98 122 133 162

G 1/2“ thermometer

Magnesium anode rod

For heating rod installation

Upper heating coil

Lower heating coil

Upper heating coil sensor sheath

Inspection hole

Lower heating coil sensor sheath

Openings for a heating rod and thermometer are located opposite the other ones.

G 5/4“

G 1“

ø 17×2

G 1“

ø 17×2

Hot water

Cold water

Circulation

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4 - Operation

This tank is designed for operation in pressure circuits. Water can be heated inside in its heat exchangers

(heating coils) from several heat sources, e.g. various hot-water boilers, renewable energy sources (heat

pumps, solar collectors). An electric heating rod can be installed to backup DHW as well.

DHW temperature inside the tank shall be kept between 60 and 65 °C. This temperature guarantees optimum

operation and the best protection against Legionella bacteria.

5 - Examples of Assigning Connection Points

Example I.

With a gas boiler and solar system.

R2GC

recirculation

gas

boiler

bbb

Conn. point Example I.

with a gas boiler

Example II.

with a boiler and accum. tank

G 5/4“ upper ﬂange magnesium anode magnesium anode

G 1/2“ thermometer thermometer thermometer

G 6/4“ plug electric heating rod

h1 cold water inlet cold water inlet

h2 outlet into a solar system outlet into a solar system

h3 temperature probe, thermostat temperature probe, thermostat

h5 inlet from a solar system inlet from a solar system

h7 return to a gas boiler return to an accum. tank

h8 temperature probe, thermostat temperature probe, thermostat

h4 circulation circulation

h9 inlet from a gas boiler inlet from an accum. tank

h11 hot water outlet hot water outlet

Connections depend on the circuit to be connected, the a.m. examples are informative only.

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Example II.

With a solid fuel boiler, solar system and accumulation tank.

boiler

R2GC

recirculation

bbb

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 - Installation and Commissioning

Installation must meet valid rules and may be done only by qualiﬁed staff. 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 heating circuits to the inlets to and outlets from heating coils. The heat source for the tank - 2 enam-

eled coils - connects with G 1” coupling.

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 lower 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 (thermo-

stat-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 1” 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, installa-

tion 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 R2GC 200, 250 and 12l volume for R2GC 300 and 400).

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

So called electronic anode can be used instead of the magnesium one. Its principle advantage is that its

proper function is signaled by a control lamp while a magnesium anode rod needs to be taken out for check. In

such a case, just visual check of the electronic anode is sufﬁcient.

Please use a G 5/4” to G ½” reducing coupler when installing an electronic anode. In order to protect the tank

properly and meet its warranty conditions, select an anode from the table below. A space of about 0.5 m is

needed between the tank top and ceiling to install/exchange the electronic anode rod (0.35 m for R2GC200).

Kit for R2GC storage water heaters

Code Anode rod length [mm] For storage water heaters

9176 350 (200/150) R2GC 200

9177 500 (350/150) R2GC 250, R2GC 300, R2GC 400

/20

REGULUS spol. s r.o.

Do Koutů1897/3 http://www.regulus.eu

143 00 Praha 4 E-mail: [email protected]

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6.6 - Commissioning

Fill the heating circuits with the appropriate ﬂuids and air-bleed the entire system. Check all connections for

leaks and verify the system pressure.

The quality of top-up and heating water is set by ČSN 07 7401:1992. Hot water quality must meet the con-

ditions shown in the Table of limit values for total dissolved solids in hot water, page 6 of this Manual.

Fill the heating circuits with the appropriate ﬂuids 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 a proper function of all control and adjusting elements.

7 - Maintenance, Replacement of Magnesi-

um Anode Rod

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 connection for leaks.

The tanks are equipped with an anti-corrosion sacriﬁce magnesium anode rod. The anode rod shall be

checked within 6 months after commissioning and subsequently always not later than 6 months after the last

check. If more than 1/3 of its total volume is consumed, the anode shall be replaced with a new one. Disre-

garded 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, 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 is described in its User’s Manual.

If damage to a tank occurs due to neglected substitution of a magnesium anode rod or a non-working elec-

tronic 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. Insu-

lation 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 hori-

zontal position is considered a warranty violation!

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