Regulus HSK 390 P Installation instructions

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HSK 390 P
HSK 390 P
EN
Installation and Operation Instructions
THERMAL STORE with stainless-steel DHW tube heat exchanger
HSK 390 P

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CONTENTS
1 Description ..................................................................................................................................................... 3
1.1 Models ............................................................................................................................................... 3
1.2 Tank protection ................................................................................................................................... 3
1.3 Thermal insulation .............................................................................................................................. 3
1.4 Packaging .......................................................................................................................................... 3
2 General Information ....................................................................................................................................... 3
3 Technical Data and Dimensions of HSK 390 P Thermal Store ................................................................... 4
4 Operation ........................................................................................................................................................ 5
5 Typical Layout Examples with Thermal Store ............................................................................................. 6
6 Installation and Commissioning ................................................................................................................... 7
7 Installing Insulation on the Tank .................................................................................................................. 8
8 Maintenance ................................................................................................................................................... 10
9 Disposal .......................................................................................................................................................... 10
10 Warranty ......................................................................................................................................................... 10

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1 - Description
HSK P Thermal Stores are intended for storing and subsequent distribution of thermal energy of heating water. They
are fitted with a stainless-steel tube DHW heat exchanger, permitting installation of electric heating elements and
connection of other heat sources. For a better thermal layering, the tank volume is separated by a baffle.
For proper operation of a tank, it is necessary to have an optimum hydraulic design of the entire heating system, i.e.
position of circulation pumps for both heat sources and heating circuits, valves, check valves etc. When more heat
sources shall be combined, it is recommended to use a smart controller for both the heat source and heat sink sides
of a heating circuit, i.e. also for charging and discharging a thermal store.
1.1 - Models
One model of 398 l total volume with stainless-steel tube DHW heat exchanger.
1.2 - Tank protectione
The thermal store 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
Thermal insulation is available as a separate item. For easier handling, the insulation shall not be fitted on the tank
until it reaches its definite place of installation. The insulation is made of fleece, 100 mm thick, with a hard polystyrene
surface. It is closed by quick locks.
1.4 - Packaging
Thermal stores are delivered standing, each screwed to its pallet, packed in bubble wrap
It is forbidden to transport and/or store the thermal stores in a horizontal position.
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 thermal energy 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 thermal store 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.

DATA SHEET
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3 - Technical Data and Dimensions of HSK 390 P Model
HSK 390 P Combination Thermal Store
Main features
Application accumulation of thermal energy for space and DHW heating
Description
combination thermal store with DHW heating in an integrated
stainless-steel heat exchanger, tted with a tight separating
metal plate that increases Seasonal coe󰀩cient of performance
(SCOP) of a heat pump
Working uid
water (DHW heat exchanger)
water; water/glycol mixture (max. 1:1)
or water/glycerine mixture (max. 2:1) (thermal store)
Code
Thermal Store 13517
Insulation 18722
Energy E󰀩ciency Data (as per EC Regulation No. 812/2013)
HSK 390 P with insulation
Energy e󰀩ciency class C
Standing loss 81 W
Storage volume 398 l
Technical Data
Total tank volume 398 l
Total uid volume in tank 377 l
Fluid volume above the separating plate 214 l
Fluid volume below the separating plate 163 l
Surface area of DHW heat exchanger above the separating plate 21 l
Surface area of DHW heat exchanger above the separating plate 6 m2
Max. working temperature in tank 95 °C
Max. working temperature in DHW HE 95 °C
Max. working pressure in tank 4 bar
Max. working pressure in DHW HE 10 bar
Tank Materials
Tank material S235JR
DHW heat exchanger material AlSl 316 L
Insulation Materials
Tank perimeter insulation eece
Tank perimeter insulation outer surface hard polystyrene
Top and bottom tank insulation eece
Dimensions, Tipping height, Insulation thickness, Weight
Tank diameter 550 mm
Tank diameter with insulation 750 mm
Tank overall height 1905 mm
Tipping height without insulation 1940 mm
Tank perimeter insulation thickness 100 mm
Bottom insulation thickness 50 mm
Top insulation thickness 120 mm
Empty weight without insulation 91 kg
HSK 390 P with insulation
HSK 390 P

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4 - Operation
This tank is designed for heating and storing heating water in household or industrial applications, however always in
closed pressure circuits with forced circulation. Hot water is heated inside the thermal store from several possible heat
sources like various kinds of heating boilers, renewable energy sources or also electric heating elements. A stainless-
-steel tube DHW heat exchanger is heated by heating water inside the thermal store. It connects through 1” threaded
fittings. When hot water is drawn from the outlet point, cold water flows into the immersed heat exchanger and heats
up by the heating water.
The thermal store shall be connected to heat sources through connecting threaded fittings.
Individual connection points are assigned according to the circuits to be connected. There is a wide choice of combi-
nations; the following chapter describes just some examples.
HSK 390 P Combination Thermal Store
Dimensions
TAPPINGS
pos. description connec-
tion
height
[mm]
Heat sources
B1 Incoming from heat source G 1“ F/4 1780
B2 Return to heat source G 1“ F/4 1210
B3 Incoming from heat source G 1“ F/4 1420
B4 Return to heat source G 1“ F/4 1880
B5 Incoming from heat source G 1“ F/4 1420
Heating system
H1 Flow to heating system G 1“ F/4 1780
H2 Return from heating system G 1“ F/4 1210
El. heating elements
E1 Electric heating element for DHW heating G 6/4“ F 1015
E2 Electric heating element for space heating G 6/4“ F 1720
E3 Electric heating element for space heating G 6/4“ F 1720
E4 Electric heating element for PV system G 6/4“ F 1210
DHW heating
W1 Cold water G 1“ M41022
W2 Hot water G 1“ M41167
Control and safety
C1 Temperature sensor G 1/2“ F 1750
C2 Temperature sensor G 1/2“ F 1290
C3 Temperature sensor G 1/2“ F 1190
C4 Temperature sensor G 1/2“ F 1050
T2Thermometer G 1/2“ F 1630
M2Pressure gauge G 1/2“ F 1510
P2Safety valve G 1/2“ F 1400
Air release
O2Air vent valve G 1/2“ F 1905
Tipping height without insulation 1940 mm

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Example I.
Heat pump + el. heating element + fireplace + PV possible
Example II.
Heat pump + gas-fired boiler + fireplace + PV possible
5 - Typical Layout Examples with Thermal Store
electric heating element for DHW
electric heating elements
for space heating
PV el. heating elements can be inserted here
PV el. heating elements can be inserted here
boiler (gas, electric,
light oil fired...)
HW CW recirculation
HW CW recirculation

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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.
6.1 - Connection to heat sources
Place the tank on the floor, as close to your heat source as possible. Connect the heating circuits 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 connection piping
6.2 - Installation of an el. heating element
The G 6/4“ side tappings are designed to accommodate electric heating rods. They can be 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: Electric heating elements shall be protected by a safety thermostat.
6.3 - Connection to water mains
DHW piping shall be done according to valid rules. Installation of a pressure reducing valve on the immersed tank inlet
is recommended. For water mains pressure above 6 bar a pressure reducing valve is necessary. To prevent water loss,
we recommend installing an expansion vessel at the cold water inlet with a minimum volume of 4% of the total volume
of water in the DHW piping, including heat exchangers, circulation pipes, etc. (usually 8 l). Should the water be too hard,
install a water softener before the tank. In case the water contains mechanical impurities, install a strainer.
6.4 - Commissioning
Ground the tank before commissioning.
The tank shall be filled up together with the heating system, 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.
Quality of DHW shall meet the conditions shown in the Table of limit values for total dissolved solids in hot
water on this page.
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 the proper function of all control and adjustment elements.
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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7 - Installing Insulation on the Tank
Product description
Thermal insulation is a part of thermal stores, preventing heat loss. For easier handling, the insulation shall not be
fitted on the tank until it reaches its definite place of installation. The insulation is made of fleece with a PUR leather
surface.
Warning
Insulation installation shall be done in two or three persons, depending on its size. The zippered, PVC coated fleece
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.
Installing Insulation
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 tappings 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 insulation lock from the side.
5. Put on the upper insulation and cover
6. Push on the covering plastic rosettes depending on the size of tappings, 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.

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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
Packaging 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 - Warranty
This product is covered by warranty under conditions specified in this Manual and the respective Warranty Certificate.
The Warranty Certificate is an integral part of supply of this Thermal Store.

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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
v1.4-01/2023