Regulus THERMAL STORE HSK 400 PR+ Owner's manual

www.regulus.eu
HSK 400 PR+
HSK 400 PR+
EN
Installation and Operation Instructions
THERMAL STORE
with stainless-steel DHW tube heat exchanger
HSK 400 PR+

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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 ................................................................................................................... 4
4 Operation ........................................................................................................................................................ 5
5 Thermal Store Connection to a Heating System ......................................................................................... 6
6 Installation and Commissioning ................................................................................................................... 8
6.1 Connection to heat sources ............................................................................................................... 8
6.2 Connection to a solar thermal system ................................................................................................. 8
6.3 Installation of an el. heating element ................................................................................................. 8
6.4 Connection to water mains ................................................................................................................ 8
6.5 Commissioning .................................................................................................................................. 8
7 Installing Insulation on the Tank .................................................................................................................. 9
8 Maintenance ................................................................................................................................................... 11
9 Disposal .......................................................................................................................................................... 11
10 Warranty ......................................................................................................................................................... 11

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1 - Description
HSK 400 PR+ Thermal Store is intended for storing and subsequent distribution of thermal energy of heating water.
It is fitted with a stainless-steel tube DHW heat exchanger, permitting installation of electric heating elements and
connection of other heat sources. For better thermal stratification of heating water, the tank is divided by a separating
metal sheet.
The lower part is equipped with a stainless-steel solar heat exchanger. The thermal store shall always be connected to
a sealed heating circuit.
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 heat sources and heating circuits, valves, non-return valves etc. When multiple heat
sources are combined, a smart controller is recommended for control of both the source and load sections of the
heating system. i.e. also charging and discharging the thermal store.
1.1 - Models
One model of 404 litres total volume with stainless-steel tube DHW heat exchanger.
1.2 - Tank protection
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 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 designed for continuous DHW heating.
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.

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3 - Technical Data and Dimensions
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. Thermal stores are supplied uninsulated. Thermal
insulation is available as a separate item, see the codes below.
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 19610
Insulation 19612
Energy E󰀩ciency Data (as per EC Regulation No. 812/2013)
HSK 400 PR+ with insulation
Energy e󰀩ciency class C
Standing loss 81 W
Storage volume 395 l
Technical Data
Total tank volume 404 l
Total uid volume in tank 374 l
Fluid volume above the separating plate 220 l
Fluid volume below the separating plate 154 l
Solar heat exchanger volume 9 l
Surface area of DHW heat exchanger above
the separating plate 21 l
Solar heat exchanger surface area 1.5 m2
Surface area of DHW heat exchanger above
the separating plate 6 m2
Max. working temperature in tank 95 °C
Max. working temperature in solar heat exchanger 95 °C
Max. working temperature in DHW heat exchangers 95 °C
Max. working pressure in tank 4 bar
Max. working pressure in solar heat exchanger 10 bar
Max. working pressure in DHW heat exchangers 10 bar
Tank Materials
Tank material S235JR
Solar heat exchanger material S235JR+N
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 110 kg
HSK 400 PR+ with insulation
HSK 400 PR+
Accessories
El. heating element (models) ETT-A, C, D, F, M, N, P
Max. length of heating element 3x 555 mm
Volume of supplied DHW (heated from 10 °C to 40 °C)
Heated volume entire entire above metal
sheet entire entire above metal
sheet entire
Backup heater 50 °C 50 °C 50 °C 60 °C 60 °C 60 °C 80 °C
Flow rate [l/min] 10 kW none 10 kW 10 kW none 10 kW none
Temperature in tank 812 20 812 20 812 20 812 20 812 20 812 20 812 20
Hot water volume [l] 363 237 120 222 187 101 195 132 106
534 359 268 321 290 266 253 235 208 567 528 516

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4 - Operation
This tank is designed to heat water and accumulate its thermal energy for space heating in household or industrial
applications, however always in closed pressure circuits with forced circulation. Various heat sources can be connec-
ted to the thermal store, like various types of hot water boilers, renewable energy sources, or possibly also electric
heating elements.
Inside the thermal store, hot water is heated by heating water in the immerssed stainless-steel DHW heat exchanger.
The immerssed stainless-steel DHW heat exchanger connects with 1“ fittings. When hot water is drawn from an outlet
point, cold water flows into the immersed DHW heat exchanger and heats up from the heating water.
The thermal store connects to energy sources using connecting fittings.
The fitting of the individual tank outlets is carried out depending on the circuits to be connected. There are a number of
options available, only some of the variants are shown in the following chapter for illustration.
Dimensions
CONNECTIONS
pos. description
connection height [mm]
Heat sources
B1 Incoming from heat source G 1“ FF/ 1780
B2 Return to heat source G 1“ FF/ 1210
B3 Incoming from heat source G 1“ FF/ 1420
B4 Return to heat source G 1“ FF/ 1880
B5 Incoming from heat source G 1“ FF/ 1420
B6 Return to heat source G 1" FF/ 1880
Heating system
H1 Flow to heating system G 1“ FF/ 1780
H2 Return from heating system G 1“ FF/ 1210
Solar thermal system
X1 Incoming from solar collectors G 1“ FF/ 1680
X2 Return to solar collectors G 1“ FF/ 1230
El. heating elements
E1
Electric heating element for DHW heating G 6/4“ F 880
E2
Electric heating element for space heating G 6/4“ F 720
E3 Electric heating element for PV system G 6/4“ F 210
DHW heating
W1 Cold water G 1“ M / 1975
W2 Hot water G 1“ M / 1025
Control and safety
C1 Temperature sensor G 1/2“ F 1750
C2 Temperature sensor G 1/2“ F 1510
C3 Temperature sensor G 1/2“ F 1190
C4 Temperature sensor G 1/2“ F 1050
T2Thermometer G 1/2“ F 1630
M2Manometer 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.
Solar collectors + el. heating elements + solid fuel boiler + heat pump
5 - Thermal Store Connection to a Heating System
KEY 1 – Regulus heat pump (RTC, CTC) 2 – pump station for heat pump – CSE TC iPWM MFB 3 – zone valves for DHW heating from HP 4 – heating system expansion vessel 5 – electric heating elements for heating system (or PV) 6 – HSK 400 PR+ thermal store 7 – RGMAT E load unit 8 – replace insert (stove) with hot water heat exchanger 9 – pump station for heating system2 - CSE2 MIX 10 – pump station for heating system1 - CSE2 MIX 11 – collector/manifold, HV 60/125-2 12 – pump station for DHW recirculation – CSE TVMIX ZV 13 – safety kit for HW storage tank 14 – DHW expansion vessel 15 – el. heating element for DHW 16 – solar expansion vessel 17 – CSE SOL solar pump station 18 – solar collectors SV – cold water TV – hot water CV – hot water recirculation ÚT – central heating (heating system) KK – ball valve ZV – check valve AOV – automatic air vent valve PTR – pressure temperature relief valve REDV – pressure reducing valve (optional) VK – drain valve SVE – expansion vessel service valve PV-ÚT – safety valve for heating system MFB – Magnet Filterball F – lter BVTS – one-way thermal relief valve
BRAIDED HOSE
COMPENSATOR

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Example II.
Solar collectors + gas-fired boiler + solid fuel boiler + heat pump
KEY 1 – Regulus heat pump (RTC, CTC) 2 – pump station for heat pump – CSE TC iPWM MFB 3 – zone valves for DHW heating from HP 4 – heating system expansion vessel 5 – PV powered electric heating element 6 – HSK 400 PR+ thermal store 7 – RGMAT E load unit 8 – replace insert (stove) with hot water heat exchanger 9 – pump station for heating system2 - CSE2 MIX 10 – pump station for heating system1 - CSE2 MIX 11 – collector/manifold, HV 60/125-2 12 – boiler (natural gas, electric...) 13 – pump station for DHW recirculation – CSE TVMIX ZV 14 – safety kit for HW storage tank 15 – DHW expansion vessel 16 – solar expansion vessel 17 – CSE SOL solar pump station 18 – solar collectors SV – cold water TV – hot water CV – hot water recirculation ÚT – central heating (heating system) KK – ball valve ZV – check valve AOV – automatic air vent valve PTR – pressure temperature relief valve REDV – pressure reducing valve (optional) VK – drain valve SVE – expansion vessel service valve PV-ÚT – safety valve for heating system MFB – Magnet Filterball F – lter BVTS – one-way thermal relief valve
BRAIDED HOSE
COMPENSATOR

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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. BP 400.
Anti-corrosion protective liquid should be also used, e.g. BP 100 Plus.
6.1 - Connection to heat sources
Place the tank on the floor, as close to your heat source (heat pump, boiler) as possible. Fit the insulation, cf. Installing
Insulation on the tank. 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 - Connection to a solar thermal system
This tank can also be used with a solar thermal system. In such a case, the inlet of heated solar fluid from a solar thermal
system connects to the upper G 1“ connection of the heating system heat exchanger, and the lower outlet connects to
the return piping to the solar thermal system. Insulate meticulously all the piping between the tank and the solar thermal
system.
6.3 - Installation of an el. heating element
The thermal store can be equipped with el. heating elements. They can be power-supplied either directly (thermostat-
-equipped elements), or via a controller for the entire heating system.
Warning: Electric heating elements shall be protected by a safety thermostat.
The electric heating element shall be wired by a professionally qualified person only.
6.4 - 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..
6.5 - 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.
Ground the tank before 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. 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 thermal insulation is made of fleece, with a hard
surface and a lock.
Warning
Insulation installation shall be done in two or three persons. The hard surface coated fleece insulation must be in-
stalled at temperatures above 20 °C. If lower temperatures cannot be avoided, the insulation shall be pre-warmed in
another room to at least 20 °C. It is difficult to install insulation of lower temperature, there is a risk of its mechanical
damage.
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 connections 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 connections, fit the elements against unintentional
lock release.
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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