Regulus HSK 500 User manual

ACCUMULATION TANKS
with DHW stainless-steel heat exchanger
HSK 500, HSK 800, HSK 1000,
HSK 1500, HSK 2000
EN
v. 1.1
Owners Manual

2
CONTENTS
1. Description ..................................................................................................................................................... 3
1.1 Models ................................................................................................................................................ 3
1.2 Tank protection ................................................................................................................................... 3
1.3 Thermal insulation .............................................................................................................................. 3
1.4 Connection points on the tank ............................................................................................................ 3
1.5 Packing ............................................................................................................................................... 3
2. General Information ...................................................................................................................................... 3
3. Technical Data and Dimensions of HSK Models ........................................................................................ 4
4. Operation ....................................................................................................................................................... 5
5. Examples of Assigning Connection Points ................................................................................................ 5-6
6. Installation and Commissioning .................................................................................................................. 7
7. Installing Insulation on the Tank .................................................................................................................. 8-9
8. Maintenance ................................................................................................................................................... 10
9. Disposal ......................................................................................................................................................... 10
10. Recommended Accessories ......................................................................................................................... 10
10.1 Electric heating rods ......................................................................................................................... 10
10.2 Heat exchanger for DHW recirculation ............................................................................................. 11
10.3 Watersoft N electromagnetic water treatment device ...................................................................... 12
10.4 Additives for heating systems .......................................................................................................... 12

3
1. Description
HSK Accumulation Tanks are intended for accumulation and subsequent distribution of thermal energy of heating water.
They are equipped with an immersed DHW stainless-steel heat exchanger (further “DHW” only), a stratification cylinder
for the heating circuit return line, two steel heating coils (e.g. for connecting solar collectors), with the possibility to insert
an el. heating rod, and enabling to connect further heat sources. The accumulation tank shall be always connected to
a closed heating circuit. The tanks are further fitted with two G 6/4” sleeves for connection to heat sources, four G 1/2”
sleeves to accommodate probe sheaths and 6 sleeves for other heat sources. The G 6/4” sleeves can be used for direct
installation of el. heating rods. The tanks have one sleeve on the top for an air vent valve, five G 6/4” side sleeves for
connection to a heating system, one G 6/4” side sleeve for installation of an el. heating rod, six side sleeves with 1/2”
thread for placing sensors and four threaded G 1” side sleeves for connecting two heating coils.
For proper operation of a tank, it is necessary to have a hydraulic design of the entire heating system, i.e. position of
circulation pumps for both heat sources and heating circuits, valves, clack valves etc. When more heat sources shall be
combined, it is recommended to use an intelligent controller, e.g. Regulus IR09 KTP, for both the source and consumer
sides of a heating circuit, i.e. also for charging and discharging an accumulation tank.
1.1 Models
Five models of 500, 800, 1000, 1500 and 2000 l capacity with a stainless steel DHW heat exchanger.
1.2 Tank protection
The accumulation tank has no inner surface finish, the outer surface is painted in gray. The DHW heat exchanger is
made of stainless steel.
1.3 Thermal insulation
For easy handling, tanks are supplied with a detachable soft insulation 120 mm thick, with a zippered leatherette
mantle.
1.4 Connection points on the tank
1x upper sleeve with G 1“ inner thread
6x side sleeve with G 6/4“ inner thread
6x (7x) side sleeve with G 1/2“ thread
4x G 1“ side sleeve
2x G 5/4“ side sleeve
1.5 Packing
Tanks are delivered standing, each screwed to its pallet, packed in bubble wrap.
2. General Information
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. The appliance shall be installed by a qualified person according
to valid rules and Manufacturer‘s Instructions.
This appliance is designed to accumulate heating water and distribute it subsequently. It must be connected to a heating
system and heat sources. This appliance is suitable for continuous heating of domestic hot water.
Using the accumulation tank for other purposes than above described is forbidden and the manufacturer accepts no
responsibility for damage caused by improper or wrong use or filling procedure.
The appliance shall be installed by a qualified person according to valid rules, otherwise the warranty becomes null and
void.

4
3. Technical Data and Dimensions of HSK Models
Tank code ......................................................... a
Insulation code ................................................. b
Total volume - tank + DHW heat exch. ........... c
Tank volume ..................................................... d
Volume - DHW heat exch. ............................... e
Volume - upper coil .......................................... f
Volume - lower coil ........................................... g
Surface - upper coil .......................................... h
Surface - lower coil ........................................... i
Surface - DHW heat exch. ............................... j
Max. working temperature - tank+h.exch. ...... 95 °C
Max. working pressure - DHW h.exch. ............ 6 bar
Max. working pressure - tank ........................... 6 bar
Empty weight .................................................... k
Model HSK 500 HSK 800 HSK 1000 HSK 1500 HSK 2000
Tank code a 7662 7663 7506 7686 7687
Insulation code b 7664 7665 7507 7688 7689
Total volume - tank + DHW heat exch. [l] c 488 805 897 1478 1915
Tank volume [l] d 443 750 842 1408 1825
Volume - DHW heat exch. [l] e 45 55 55 70 90
Volume - upper coil [l] f - 7,8 12,1 12,3 18,1
Volume - lower coil [l] g 10 12,1 12,3 12,3 23,7
Surface - upper coil [m2]h- 2 3 3,5 4,2
Surface - lower coil [m2]i2,3 3 3,5 3,5 5,5
Surface - DHW heat exch. [m2]j5,7 7,2 7,2 8,5 11,5
Empty weight [kg] k 130 200 250 285 325
Dimensions [mm] A 1720 1930 2110 2240 2380
B1640 1830 2010 2120 2260
C1420 1580 1760 1825 1950
D1150 1290 1500 1500 1730
E- - - - 1470
F820 920 1130 1130 1210
G440 570 580 600 750
H240 270 270 335 350
I190 220 220 285 300
J150 170 170 235 250
K280 310 310 375 390
L490 465 495 520 630
M700 670 730 765 870
N800 770 840 875 970
O910 870 950 975 1080
P1020 980 1060 1085 1190
Q1150 1090 1210 1195 1300
R- - - 1305 1410
S- 1190 1350 1415 1520
T- 1290 1450 1525 1640
U1400 1390 1520 1635 1760
V- 1500 1680 1745 1870
ø W 850 1030 1030 1240 1340
ø X 650 790 790 1000 1100
G 6/4“
G 6/4“
30°
Insulation
ø W
ø X
G 5/4“
16°
A
B
C
D
E
F
G
H
I
J
K
L
M
T
N
O
P
R
Q
S
V
U
ø V
G 5/4“
G 1/2“
G 1/2“
G 1“
G 5/4“
el. top. těleso
G 6/4“
G 1/2“
G 6/4“
G 6/4“
G 6/4“
G 1/2“
G 1/2“
G 6/4“
G 1“
G 1“
G 1/2“
G 1/2“
G 1“
G 1“
G 6/4“
1
2
3
14
11
10
4
5
6
9
15
13
21
16
78
12
19
18
17
20
20

5
hot water
cold water
CCC
CCC
CC
CC
CCC
CCC
B
T5
E
E
gas boiler
with DHW tank
B
A"#
4. Operation
This tank is designed for heating and accumulation of heating water in household or industrial applications, however
always in closed pressure circuits with forced circulation. Hot water is heated inside the accumulation tank from several
possible heat sources like various kinds of heating boilers, renewable energy sources (heat pumps, solar collectors),
or also electric heating elements.
The immersed stainless-steel DHW heat exchanger is heated by heating water inside the accumulation tank. The
immersed DHW heat exchanger shall be connected to cold water inlet with one 5/4” threaded fittings, and to hot water
with the other one. When hot water is drawn from the outlet point, cold water flows into the immersed heat exchanger
and heats up from the heating water in the accumulation tank.
The accumulation tank shall be connected to heat sources through G 6/4” threaded fittings. A solar system connects to
the connection points of the heating coils through G 1” threaded fittings.
Individual connection points are assigned according to the circuits to be connected. There is a wide choice of combinations,
the following chapter describes just some examples.
5. Examples of Assigning Connection Points
Example I.
Solar collector + combination gas boiler + fireplace.
Connection point
Example I.
Solar collector + combination gas
boiler + fireplace
Example II.
Solar collector + heat pump
+ el. heating rod.
Example III.
Solar collector + gas boiler
+ solid fuel boiler.
11 plug / recirculation heat exchanger 1 plug / recirculation heat exchanger 1 plug / recirculation heat exchanger
2outlet to a gas boiler‘s DHW tank outlet ot a DHW storage tank outlet ot a DHW storage tank
5plug el. heating rod plug
7cold water inlet cold water inlet cold water inlet
8inlet from a manifold, expansion tank,
safety valve
inlet from a manifold, expansion tank,
safety valve
inlet from a manifold, expansion tank,
safety valve
9outlet to a fireplace plug outlet to a solid-fuel boiler
10 outlet to solar panels outlet to solar panels outlet from solar panels
12 inlet from solar panels inlet from solar panels inlet from solar panels
14 plug plug plug
15 outlet to a combination gas boiler outlet to a heat pump outlet to a heat pump
16 outlet to solar panels outlet to solar panels outlet to solar panels
17 plug plug plug
20 inlet from a comb. gas boiler, to manifold inlet from a heat pump, to manifold inlet from a gas boiler,solid-fuel boiler
21 inlet from solar panels inlet from solar panels inlet from solar panels
3, 4 ,6, 11, 13, 18, 19 thermometers, sensors, plugs thermometers, sensors, plugs thermometers, sensors, plugs
Connections depend on the circuits to be connected, the a.m. examples are informative only.

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Example II.
Solar collector + heat pump + el. heating rod.
Example III.
Solar collector + gas boiler + solid fuel boiler.
CCC
CCC
CC
CC
CCC
CCC
B
TT
E
E
hot water cold water
CCC
CCC
CC
CC
CCC
CCC
B
TT
E
gas boiler
E
hot water cold
water

7
6. Installation and Commissioning
Installation must meet valid rules and may be done only by qualified staff.
Defects caused by improper installation, use or handling are not covered by warranty.
After the tank is installed and connected to an existing heating system, it is recommended to clean the entire heating
system using a suitable cleaning agent, e.g. MR-501/R.
Anti-corrosion protective liquid should be also used, e.g. MR-501/F.
Connection to heat sources
Place the tank on the floor, as close to your heat source as possible. Mount the insulation, cf. Installing Insulation on the
Tank. Connect the heating circuit to inlets and outlets respecting the thermal stratification in the tank. Install a drain valve at
the lowest point of the tank. Install an air vent valve at the highest point of the system. Insulate all the connecting piping.
The tank may be fitted with electric heating rods up to 12kW output. They can be power-supplied either directly (elements
with built-in thermostat) or via a controller for the entire heating system.
All electric heating elements shall be protected by a safety thermostat.
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 upper sleeve of the heating coil G 1” and the lower outlet to the return piping to the solar system.
Insulate all the piping between the tank and the solar system.
Connection to a water pipeline
Connect the tank to a water main according to valid rules. Installation of a pressure reducing valve on the tank inlet is
recommended. For a water main with pressure above 6 bar a pressure reducing valve is necessary. Should the water be
too hard, install a water softener before the tank. In case the water contains mechanical impurities, install a strainer.
Commissioning
The tank shall be filled up respecting valid standards and rules. In order to minimize corrosion, special additives for heating
systems should be used. The quality of heating water depends on the quality of filling water at commissioning, on the top-
up water and on the frequency of topping up. This has a strong influence on the lifetime of heating systems. Poor quality of
heating water may cause problems like corrosion or incrustation, esp. on heat transfer surfaces.
The quality of top-up and heating water is set by ČSN 07 7401/1992Sb.
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 proper function of all control and adjusting elements.

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7. Installing Insulation on the Tank
Description
Thermal insulation is a component of accumulation tanks that prevents heat losses. For these types of accumulation
tanks, insulation is supposed to be installed on the spot for easier handling. Insulation made of soft polyurethane foam
with a zippered PVC layer is used.
Warning
Insulation installation shall be done in two or three persons, depending on its size. The zippered soft-foam insulation
must not be installed at temperatures below 20°C. If this cannot be avoided, the insulation shall be pre-warmed in
another room to at least 20°C. It is impossible to install insulation of lower temperature, there is a risk of damage, esp.
to the zipper.
Do not use any tools for installation.
Keep away from open fire.
How to install soft foam insulation with a PVC layer
1. Fix the tank following installation instructions.
2. Wrap the insulation around the tank carefully. Check that the insulation adheres to its body perfectly. This can be
reached by rubbing and patting the insulation by hand from its center evenly in both directions until the insulation
adheres to the tank’s surface completely and no bubbles are left.
3. Use the holes for sleeves as a rest during the insulation installation.
4. At least one person presses the insulation to the tank, pulling both ends together. The other person closes the zipper,
see pics.
5. Put on the upper insulation and cover.
6. Push on the covering plastic rosettes depending on the size of sleeves, or put on the flange plug(s) with insulation.
7. Finish the tank installation in compliance with the respective instructions and valid standards and rules.
Warranty on insulation
□Warranty shall become null and void if:
○the procedure described in the Installation Manual was not respected,
○the product was used for other purposes than intended.
□Warranty does not cover:
○usual wear and tear,
○damage caused by fire, water, electricity or a natural disaster,
○defects caused by failure to use the product in compliance with its intended purpose,
by improper use and insufficient maintenance,
○defects caused by mechanical damage to the product,
○defects caused by tampering or incompetent repair.

9
12
78
6
5
4
3
Pictures showing how to mount soft-foam
insulation with a PVC sheet on a storage water
heater.

10
G 6/4” thread, nickel-plated copper
power
output
(kW)
voltage
(V)
length l
(mm) code
2 230 270 6146
3 230 240 6063
4.5 3 x 230 333 6064
6 3 x 230 428 6065
7.5 3 x 400 520 6066
9 3 x 400 615 6067
12 3 x 400 750 7032
G 6/4” thread, stainless steel, thermostatic head, adjustable by a knob (K)
or screwdriver (S) adjustment
power
output
(kW)
voltage
(V)
length l
(mm) code
K 2 230 405 8248
K 3 230 408 8249
S 2 230 405 8250
S 3 230 408 8252
8. Maintenance
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.
9. 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.
10. Recommended Accessories
10.1 Electric heating rods
Electric heating rods can be used in domestic storage water heaters and accumulation tanks. They can be power-
supplied either by 230V or 3x230V/400V. Heating rods of output 2-12 kW can be installed into accumulation tanks, into
the sleeves with G 6/4” inner thread (the right type should be selected with respect to its length and the tank diameter).
Electric heating rods are currently made of nickel-plated copper. They can be also supplied in a copper or stainless-steel
version. Heating rods with an integrated electronic thermostat and a safety thermostat are also available.
G 6/4” thread, nickel-plated copper, thermostatic head
power
output
(kW)
voltage
(V)
length l
(mm) code
4.5 3 x 230 333 7034
6 3 x 230 428 7035
7.5 3 x 400 520 7036
9 3 x 400 615 7037
12 3 x 400 725 7038
L75
L108
L135
Ø 110

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10.2 Heat exchanger for DHW recirculation
It is designed to preheat the circuit of DHW recirculation, enabling to cover the heat loss of the recirculation circuit from
the solar system directly. This heat exchanger can be installed in place of the top plug of the accumulation tank. It has
a G 1” connection thread and is 710 mm long. Inlet to and outlet from the heat exchanger are done through threaded
fittings with G 1/2” outer thread. Its plug incorporates a manual air discharge valve for the accumulation tank.
Before installing recirculation, it is advisable to consider if it pays off. There are two aspects, mutually contradicting.
Faster supply of hot water to an outlet point and always hot water of a comfortable temperature, for the price of increased
energy consumption (power for a recirculation pump and heat losses in piping). On the other hand, thanks to a faster
supply of hot water, losses caused by drawing cold water from the hot-water tap are eliminated and water savings are
reached. The connecting pipes of the recirculation heat exchanger and recirculation circuit inside a building shall be well
insulated to prevent heat loss. In case of a poor insulation or a more distant outlet point, the output of the heat exchanger
might be insufficient due to its limited size.
3c.KK
3c.KK
An example how to
connect DHW
recirculation via
a special heat
exchanger installed
into a HSK.
hot water cold water recirculation

12
10.3 Watersoft N electromagnetic water treatment device
The device for electromagnetic water treatment, Watersoft N, uses no chemicals. It softens water, prevents scale
formation and dissolves existing sediments. It is particularly suitable for use with devices with thermally stresses spots
like heat exchangers and storage water heaters. Among its advantages is a quick and easy installation, no need for
plumber’s intervention and min. operation costs (consumption of el. energy 2W).
10.4 Additives for heating systems
MR-501/F
Protective liquid made of organic compounds, intended for use in heating and cooling systems, solar collectors and heat
pumps. It prevents corrosion of metals (iron, copper, aluminum etc.) and their alloys by creating a film on the surface that
is in touch with the heating liquid. It can be mixed with antifreeze fluids. Recommended use: after cleaning the system
with M 501.
MR-501/96P
Liquid agent of balanced efficiency for underfloor heating, solar panels and plastic piping. It creates a protective film
and prevents growth of algae and gas formation. The system is also protected against calcareous sediments. This well-
balanced mixture of corrosion inhibitors and protective film creating compounds ensures a max. protection of underfloor
heating and solar panel circuits.
MR-501/R (1kg)
Concentrated alkaline anti-corrosion liquid removing scale and calcareous sediments from heating systems. It dissolves
scale and rust and makes it possible to remove them by flushing the system. 2 liters of MR-501/R shall be added
to every 80-100 l of heating water and let to act for 2-3 weeks depending on the degree of sedimentation. Then the
heating system shall be drained and flushed. When filling new water, it should be treated by adding the protective liquid
MR 501/F.
Model WATERSOFT N
Operation indication green LED
Version wall mount
Power supply 230V / 50Hz
Power input max. 2W
El. protection IP 65
Dimensions 70 x 50 x 34 (mm)
Max. pipe diam. 1 ½“
Max. water flow 4m3/h

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08/20088 8
Date of purchase:....................................
Stamp print, signature of the salesman and address of the shop:
1. The warranty period is 60 months from the date of purchase.
2. When claiming warranty, this Warranty Certificate must be submitted together with the
purchase receipt.
3. The warranty is valid only when the technical conditions set by this Manual are
maintained and installation is done by an authorized person (confirmed in the Warranty
Certificate).
4. The claimed defect must not be caused by tampering, improper installation and operation,
using the product for other purposes than intended, placing the product in improper
environment, or by a natural disaster.
5. Claims shall be settled by your dealer at the address shown below.
for HSK Accumulation Tank
WARRANTY CERTIFICATE
Date of a professional installation by plumber: .......................................
Stamp print, signature and address of the authorized person:
WARRANTY CONDITIONS
Model: ..............................................................................
Serial number: ..................................................................