VOKERA Indirect SC 250L, Indirect SC 150L, Indirect SC 180L, Indirect SC 210L, Indirect SC 310L Installation Instructions Manual
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AquaFlow Unvented Hot Water Cylinders
Indirect SC - 120L- 150L – 180L - 210L – 250L – 310L
Direct – 120 6kW – 150l 6kW – 180 6kW -210 6kW-250 6kW – 310 6 kW
Solar (Twin Coil) – 210L - 250L – 300L
Installation Instructions GB, IE
Unvented Hot Water Cylinder
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INTRODUCTION
The following pages incorporate the installation instructions and must be left in a safe place adjacent to the cylinder or
given to the end user once they have been correctly instructed in the effective operation of the cylinder. The Installer has a
duty of care to instruct the end user how to operate the cylinder correctly.
Vokèra will not accept liability for any claims or damages from failure to observe these instructions.
These instructions include essential and important information for safe and correct installation, and are an integral part of
the product. As a consequence all technical documents must always accompany the product.
Vokèra are continually developing its product range and therefore reserves the right to change specification without
prior notice. All the data and instructions contained in this manual are subject to review or product update changes at any
time. They will be current at time of print. If in doubt please contact the manufacturer to ensure you have the correct and
current manual.
Please always refer to the instructions contained in this manual when installing the equipment.
The operations described in these instructions require specialised knowledge and therefore it is essential the installer has
the appropriate qualifications and competence training prior to installing the product. You should only install this product
once you have achieved such technical qualifications.
The instructions are provided in schematic form only as installations designs may vary. The diagrams used are purely
indicative and as such have no pretence of completeness and are not intended to replace the design.
Please ensure that the installer has fully completed the Benchmark Checklist on the inside back pages of the
installation instructions supplied with the product and that you have signed it to say that you have received a full and
clear explanation of its operation. The installer is legally required to complete a commissioning checklist as a means of
complying with the appropriate Building Regulations (England and Wales).
All Installations must be notified to Local Area Building Control either directly or through a Competent Persons
Scheme. A Building Regulations Compliance Certificate will then be issued to the customer who should, on receipt,
write the Notification Number on the service record / checklist. This product should be serviced regularly to ensure its
safety, efficiency and performance is maintained. The installation engineer should complete the relevant Service
Record on the Benchmark Checklist after each service. The service record / checklist is required in the event of any
warranty work and as supporting documentation relating to home improvements in the optional documents section of
the Home Information Pack This must be completed and left with the product at all times as it contains importance
commissioning reference information which is essential information for future service work. Failure to do so will result
in the warranty becoming void.
Vokèra cannot be held liable for any loss or damage arising from product specifications deviating from the standard version.
The information contained within this document has been compiled with all possible care, Vokèra cannot be held liable for
any installation errors, loss or damage or work performed by third parties.
© 2017 Vokèra reserves the right to change this document at any time. All rights reserved.
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TABLE OF CONTENTS
1.1 Personal Responsibility ................................ 4
1.2 Field of use .................................................. 4
1.3 Certifications and Markings .......................... 4
1.4 Cylinder ...................................................... 4
1.5 Meaning of the symbols used here in ............. 4
1.6 Measuring ................................................... 4
2.1 Installation site ............................................ 5
2.2 Electrical ..................................................... 5
2.3 Unvented .................................................... 5
2.4 Personal Protection ..................................... 5
2.5 Delivery and packaging ................................ 5
2.6 Transport and manual handling ..................... 5
3.1 Dimensions ................................................. 6
3.2 Elements of the Hot water cylinder ............... 7
3.3 Safety Devices ............................................. 7
3.4 Elements of the Twin Coil (solar) Cylinder ...... 8
3.5 Solar Heating system .................................. 9
3.6 Cylinder control components ........................ 9
3.7 Immersion Heater ...................................... 11
3.8 Technical data table ................................... 12
3.9 Pack contents ............................................ 15
3.10 Kit contents ............................................. 15
4.1 Installing pipes for the heating circuit .......... 17
4.2 Cold mains inlet ......................................... 18
4.3 Safety Assembly ........................................ 18
4.3.1 Building Regulation G3 ............................... 20
4.4 Unit filling ................................................. 22
4.5 Electrical connection .................................. 22
4.6 Safety limiting device ................................. 24
4.7 Solar controller .......................................... 25
4.8 T&P........................................................... 25
4.9 Motorized Zone Valve ................................. 25
4.10 Dual Thermostat ...................................... 25
4.11 Drainage .................................................. 25
4.12 Unit emptying .......................................... 26
4.13 Restart after a long term stop .................... 26
5.1 Electrical Check .......................................... 26
5.2 Pre-Fill Check ............................................. 27
5.3 Fitting System ........................................... 27
5.4 Drain System ............................................. 27
5.5 Cleaning The System .................................. 27
5.6 Setting And Testing Controls ...................... 27
5.7 Handing Over ............................................. 28
6.1 General ..................................................... 28
6.2 Water circuit / Condensate discharge ........... 28
6.1 Replacement of the immersion heater ......... 29
6.2 Outer cover cleaning ................................... 29
6.3 Hydraulic safety unit efficiency check ........... 29
6.4 General notes ............................................ 29
6.5 After-sales service ...................................... 29
6.6 Service record / Logbook ............................. 32
Unvented Hot Water Cylinder
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Symbol
Meaning
Failure to comply with the provision in question may result in injuries and/or damages to people, objects,
plants or animals.
1 GENERAL NOTICE
1.1 Personal Responsibility
The manufacturer is responsible for the product’s conformity to the relevant construction directives, laws and regulations in
force at the time the product is first commercialised. The Plumbing Engineer/Electrician/Installer and User are the each
exclusively responsible in their respective fields, for knowing and observing the legal requirements and technical regulations
concerning the design, installation, operation and maintenance of the appliance. Reference to laws, regulations or technical
specifications contained in this manual is purely for information purposes; any new laws introduced or modifications to
existing laws are not in any way binding on the manufacturer towards third parties.
1.2 Field of use
The indirect water heater for the production of hot water is only intended to be used for Domestic Hot Water heating,
without exceeding the usage restrictions specified herein. To this purpose it must be hydraulically connected to a sanitary
domestic hot water delivery network. It requires a power supply to operate.
Never use the unit for any purposes other than those specified herein. Any other use is to be deemed as inappropriate and
is not allowed. The manufacturer cannot be held responsible for any installation errors and inappropriate equipment use.
1.3 Certifications and Markings
The CE marking applied to the appliance certifies that it conforms to the essential requirements of the following European
Directives:
2006/95/EC concerning the safety of electrical equipment;
2004/108/EC concerning electromagnetic compatibility
EN60335-2-21 Electrical Safety for Direct Cylinders
EMC conformity
1.4 Cylinder
The cylinder is manufactured in six sizes of direct and indirect models 120L, 150L, 180L, 210L, 250L 310L plus 3 sizes of solar
models 210L 250L 300L. The cylinders are manufactured from stainless steel AISI316L and it has Thermal insulation is
ensured by a highly biological, CFC-free rigid polyurethane foam (PUR) coating. The full compressed foam coating allows to
minimal energy losses. The external coating is made of a soft PVC material. It is supplied with all required control devices
including a 2 port motorised valve
The cylinder works utilising the main domestic water supply and does not require stored cold water to operate. The hot and
cold connections are 22mm. To enable the cylinder to work at its optimum level a cold water supply with a pressure and
flow rate appropriate for the system is required.
1.5 Meaning of the symbols used here in
1.6 Measuring
The measuring units used in this manual for dimensions are those of the International System (SI).
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2 SAFETY
2.1 Installation site
The floor on which the unit is to be standing must be capable of supporting (locally) the weight (see Technical data table) of
the full unit. Do not install the cylinder on floors made of chipboard or other flooring where the mechanical strength is
compromised when damp. If the cylinder is fitted very high in the building negative pressure may form, in this instance the
competent person must decide whether an anti-vacuum valve is required to protect the cylinder.
2.2 Electrical
The indirect water heater should have 240V-12.5A electrical supplies. All electrical terminal covers must be securely in place
before power is switched on. The unit must be earthed. The pipework to and from the unit must be earth bonded.
2.3 Unvented
No valves must be fitted between the vessel and Pressure Reducing Valve (PRV). No valves must be fitted between the
vessel and its expansion vessel.
2.4 Personal Protection
When installing and servicing the appliance, recommend the use of suitable protective clothing (i.e. gloves).
2.5 Delivery and packaging
The indirect water heater is supplied in an environment-friendly and easy to handle cardboard packaging with protective
inserts. Make sure that the packaging material is disposed of properly in compliance with the local environment-related
regulations in force. Should the cylinder show any clear signs of any transport damage, then you should inform the supplier
and return it immediately. In this instance do not attempt to install the appliance.
2.6 Transport and manual handling
When moving the Cylinder always keep your back straight, bend your knees, don’t twist, move your feet. Avoid bending
forwards or sideways and keep the load as close to your body as possible. Where possible transport the unit using a suitable
trolley, sack truck or get some assistance. Grip the Cylinder firmly and before lifting establish where the weight is
concentrated to determine the centre of gravity, repositioning yourself if necessary. When storing and transporting it,
always keep the indirect water heater vertical (straight) in its original packaging. When transporting to a second floor, it is
permissible to tilt the unit to an angle of 45°, provided utmost care is taken when moving it to its final location.
Due to the forward inclination, when using forklift trucks or other means of transport proceed slowly and fasten the
equipment to prevent it from tipping. When manually carrying and putting into position the cylinder, after removing the
packaging you need to use the auxiliary equipment/the bracket for transportation.
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Model
Unit
Dia
Height
120L. Ind / Dir
mm
554.5
1001
150L. Ind / Dir
554.5
1191
180L. Ind / Dir
554.5
1371
210L. Ind /Dir/Solar
554.5
1593
250L. Ind /Dir/Solar
554.5
1843
310L / 300L. Ind /Dir/Solar
554.5
2153
System Overview
1. Heat Source a. Heating flow
2. Cylinder b. Heating return
3. Two port motorised valve
4. Electric Immersion heater
5. Two port motorised valve
6. Auto air separator
7. Hot water expension vessel
8. Hot water thermostatic mixing valve
3 TECHNICAL DATA
3.1 Dimensions
Unvented Hot Water Cylinder
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3.2 Elements of the Hot water cylinder
3.3 Safety Devices
The cylinder is delivered with all safety and control devices for the safe operation of the unvented hot water supply
system. ** denotes solar cylinder only.
Factory fitted temperature & pressure relief valve (90°C / 7 bar)
Expansion relief valve (6 bar)
Thermal cut out for immersion heater
Primary heating thermal cut out 80°C
Pressure reducing valve (3.5bar) with inline strainer
** Solar pump thermal cut-out, set at 80°C, and connected to the solar pump in order to isolate this heat
source if there is a fault in the solar controller.
** Solar cylinder thermal cut-out, set at 80°C, to be connected to the 2 port motorised valve in order to isolate
the primary heat source if the water supply thermostat fails.
Unvented Hot Water Cylinder
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3.4 Elements of the Twin Coil (solar) Cylinder
No motorised valve is supplied for the solar pipework and it is mandatory that the solar system be supplied
with a solar hydraulic station.
The cylinder solar indirect coil can only be connected to a solar circuit that is controlled via a hydraulic
station which incorporates a pump and non-return valves.
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If a motorised valve is used this must be fitted on the primary return due to possible high temperatures of
the solar circuit.
3.5 Solar Heating system
The solar heating system is a closed hydraulic system in which the heat transfer fluid transfers the
heat to the water in the cylinder via a heat exchanger.
The water in the cylinder is heated by two separate circuits. In the lower coil the water is heated by
the solar circuit and as the water in the lower section of the cylinder is generally at a lower
temperature in enables sufficient heat transfer even when the solar radiation level is low. The
upper coil is heated by an external heat source (boiler or immersion heater) and heats the upper
section of the cylinder from which hot water is drawn for domestic purposes.
3.6 Cylinder control components
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Information inspection access to the cylinder is available by removal of the immersion heater boss.
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3.7 Immersion Heater
Hot water temperature Settings –
1. 20°c
2. 35°c
3. 45°c
4. 60°c
5. 68°c
The cylinder is equipped with an additional electric immersion heater with an output of 3kW. The immersion
heater will be found under the top front cladding and is designed for use in unvented cylinders. It has a
temperature controller and a thermal cut out. To set the temperature required simply turn the arrowhead so
that it points at one of the numbers between 1 and 5. The list above shows the approximate temperature for
each setting.
When required the immersion heater boss can be used as an access to view internal of the cylinder
You can also control the temperature using a separate hot water control device with a suitable dual channel
230v timer.
Information inspection access to the cylinder is available by removal of the immersion heater boss.
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