Strom Combi E-Boiler Series User manual

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The Strom E-Boiler
INSTALLATION GUIDE
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STROM LIMITED 2020
THE FUTURE OF HEATING
IT’S ALL IN THE DETAILS...
REMEMBER TO REGISTER
WWW.STROMLTD.COM/GUARANTEE
2ND ISSUE

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Please read the whole manual before attempting installation and follow these installation instructions carefully
following the correct operating instructions to ensure long life of this Strom Electric Boiler. These instructions
must be conserved and given to any new user.
All boilers come with a full 2-year warranty from the date of registration unless purchased with a promotional
warranty. The warranty relates to any manufacturing defects and covers the replacement of any faulty parts and
labour costs. The warranty will not cover damage to the boiler through poor installation, and any consequent
water damage or leaks into the boiler - All plumbing must be checked before the boiler is left with the end user
for normal operation and water tightness. The warranty will not cover charges that have not been organised by
Strom Ltd.
This appliance is not intended for use by anyone (including children) with reduced physical, sensorial or mental
capacities, or lack of experience with the appliance, unless they have been given supervision or instruction by a
competent person responsible for their safety.
INTRODUCTION
Electric Boilers
BY FITTING THIS BOILER YOU AGREE:
• YOU HAVE CARRIED OUT ALL HEAT LOSS CALCULATIONS ON THE PROPERTY AND ARE
SURE THAT THIS BOILER IS SUITABLE FOR THE APPLICATION.
• YOU HAVE CARRIED OUT A VOLTAGE AND LOAD TEST TO DETERMINE THE CORRECT
SIZED BREAKER IS USED.
• YOU HAVE CHECKED IN THE CASE OF THE COMBINATION BOILER THAT THE HOT WATER
FLOW RATE IS SUFFICIENT FOR THE APPLICATION
• THAT THE BOILER IS FITTED IN A MANOR AND LOCATION WHERE IT CANNOT BE
ACCESSED BY UNAUTHERISED/UNQUALIFIED PERSONS.
• TO BE BOUND TO THE TERMS AND CONDITIONS ON THE LAST PAGE OF THIS MANUAL.
• THE BOILER HAS BEEN RECEIVED IN GOOD CONDITION

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This electric boiler must be tted in accordance with the following: -
- The local building regulations
- UK building regulations
BS EN 12828
Heating systems in buildings: Design for water-based heating systems.
BS EN 12831
Heating systems in buildings: Method for calculation of the design heat load
BS EN 14336
Heating systems in buildings: Installation and commissioning of water-based heating systems
BS7671
Requirements for electrical installations. IEE Wiring Regulations. Seventeenth edition
BS EN 7593
Code of practice for treatment of water in heating systems
1. Load Check
- A load check should be taken into consideration when installing high output boilers
2. Central heating design
- Detailed recommendations are provided in BS EN 12828 and BS EN 6700
3. Location
- The boiler can be installed in almost any location, but consideration should be given to the potential of frost
or damp conditions, and to the future maintenance of the equipment. Clearance should be allocated for the
removal of the front panel if necessary and for air ow into the boiler. The boiler must be installed in an upright
position, failure to do so will invalidate the warranty The wall where the boiler is being sited should be strong
enough to support the weight of the boiler when full.
RELEVANT STANDRARDS
Electric Boilers

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BOILER SPECIFICATION
Electric Boilers
630mm
350mm
210mm
SINGLE PHASE THREE PHASE
7kW 11kW 14.4kW 18kW 21kW 24kW
Voltage 230V 230V 230V 400V 400V 400V
Amps 32A 55A 62A 27A 32A 36A
Recommended Breaker 40A 63A 63A 32A 40A 40A
Recommended Cable Size 4mm210mm210mm23x4mm23x6mm23x6mm2
Max. Heating Pressure 1.5 Bar
Min. Heating Pressure 0.5 Bar
Max. Flow Temp 80oC
Min. Flow Temp 20oC
Heating Connection Size 3/4” Male (We Recommend Flexi Hoses, Not Irons)
PRV Connection Size 1/2” Female
700mm
425mm
260mm
SINGLE PHASE THREE PHASE
7kW 11kW 14.4kW 18kW 21kW 24kW
Voltage 230V 230V 230V 400V 400V 400V
Amps 32A 55A 62A 27A 32A 36A
Recommended Breaker 40A 63A 63A 32A 40A 40A
Recommended Cable Size 4mm210mm210mm23x4mm23x6mm23x6mm2
Max. Heating Pressure 1.5 Bar
Min. Heating Pressure 0.5 Bar
Max. DHW Pressure 6.0 Bar
DHW Flow Rate (ltrs/min)* 4 6 7 9 10 12
Heating Connection Size 3/4” Male (We Recommend Flexi Hoses, Not Irons)
DHW Connection Size 1/2” Male ( We Recommend Flexi Hoses, Not Irons)
PRV Connection Size 1/2” Female
*Recommended Flow Rate To Offer 30 Degree Temperature Rise Of Incoming Cold Mains Supply
COMBINATION ALL ELECTRIC BOILER...
SYSTEM ALL ELECTRIC BOILER...

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Electric Boilers
WHATS IN THE BOX?
COMBINATION ALL ELECTRIC BOILER...
SYSTEM ALL ELECTRIC BOILER...
1. BOILER
2. INTEGRATED WALL MOUNTING BRACKET
3. WALL MOUNTING GUIDE
4. 3 x EXPANDING WALL BOLTS
5. INSTALLATION MANUAL

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Please ensure that all steps of the installation schedule are carried out in this order, and only this order. Failing
to carry out the installation in this order may result in damage to the boiler and incorrect function of the system.
INSTALLATION SCHEDULE
Electric Boilers
1. HEAT LOSS CALCULATION.
Correctly calculate the correct size unit for the properties heating demand. We regret to inform you that after
installation there is no way to boost the output of the unit so it is important you get the correct unit for the
property. Strom are unable to assist with these calculations.
2. HOT WATER CALCULATION.
For combination units ensure that the boiler has a sufcient heat output to provide the correct temperature &
ow of water required for the application. If you need help calculating this please contact Strom.
3. VOLTAGE & LOAD CALCULATION.
Typically the UK single phase supply is 230V, all our technical data is based on this, however you should do a
measurement and correctly dtermine the correct input voltage, this will determine the size of breaker required.
All our breaker recommendations are only that, and should be checked against your requirements.
4. MAINS WATER PRESSURE.
The maximum rated pressure of the units is 6bar, where water pressure is approaching this limit, or where
dynamic pressure varies and may exceed this a pressure reducing set on the mains supply should be installed.
COMBI BOILER ONLY
COMBI BOILER ONLY
PRIOR TO INSTALLATION
All of these considerations must be made prior to at least installation but preferably before purchase is made.
Regretably once the box to the boiler has been opened we are unable to accept returns of the product unless the
product is faulty or does not operate as advertised by Strom.
IMPORTANT
It is important that once you start installing the boiler you do not leave it unattended with power connected or
water in the circuits unless the whole installation and all steps have been completed. If you intend to leave the
boiler unattended without completing the installation you should ensure that no leaks are present or possible,
and that the electric have been isolated.

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INSTALLATION
1. COMPLETE SYSTEM PIPING.
2. WALL MOUNT THE BOILER.
3. CONNECT, FILL & FLUSH BOILER
4. CHECK ALL WATER CONNECTIONS
SEE PAGE 12
SEE PAGE 23
SEE PAGE 25
SEE PAGE 28
5. MAKE ELECTRICAL CONNECTION SEE PAGE 29
6. WIRE AN EXTERNAL THERMOSTAT SEE PAGE 30
7. CHECK ELECTRIC CONNECTIONS SEE PAGE 31
8. POWER ON THE BOILER SEE PAGE 32
9. SET BOILER PARAMETERS SEE PAGE 33
10. SET PUMP SPEED & PURGE AIR SEE PAGE 34
POST INSTALLATION
1. PROGRAM THERMOSTAT.
2. TEST HEATING & HOT WATER
3. COMPLETE CHECK LIST
4. ASK OWNER TO REGISTER
REFER TO MANUFACTURERS MANUAL
SEE PAGE 36
SEE PAGE 37
11. SET DHW FLOW & TEMPERATURE SEE PAGE 35
REFER TO www.stromltd.com/guarantee

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1. Circuit breaker
2. Power access window
3. Heating system patented heat exchanger
4. Thermal cut-outs
5. Heating expansion vessel
6. Temperature sensor for heat ow
7. Temperature sensor for heat return
8. Automatic air vent (access behind pump)
9. Pump
10. Pressure gauge
11. Pressure sensor (linked to gauge)
12. Pressure & expansion relief valve
13. Heating system replenishing valve
HEAT ONLY SCHEMATIC
Electric Boilers

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COMBI SCHEMATIC
Electric Boilers
1. Circuit breaker
2. Power access window
3. Heating system patented heat exchanger
4. Thermal Cut-outs
5. Heating expansion vessel
6. Temperature sensor for heat ow
7. Temperature sensor for heat return
8. Automatic air vent (access behind pump)
9. Pump
10. Pressure gauge
11. Pressure sensor (linked to gauge)
12. Pressure & expansion relief valve
13. Heating system replenishing valve
14. Thermal Cut-outs
15. Domestic hot water heat exchanger
16. Temperature sensor for hot water outlet
17. Temperature sensor for cold water inlet
18. Flow sensor for domestic hot water

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SCREEN DIAGRAM
Electric Boilers
POWER BUTTON
Turns the boiler On or
Off.
MENU BUTTON
Used by the installer
to enter conguration
mode.
INCREASE VALUE
Increases value such as
temperature.
IGNITION
The boiler is currently heating up either for
heating or hot water.
RETURN TEMPERATURE
The return temperature is too high.
RETURN TEMERATURE
The return temperature has reached the
temperature differential set by the installer.
BOILER
ACTIVITY
Shows if the
boiler is heating
water or central
heating.
(Combi Only)
POWER
INDICATOR
Shows if
the boiler is
receiving power
& powered on
SUN MON TUES
shower heating

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INCREASE VALUE
Increases value such as
temperature.
TUES WED THUR FRI SAT
Clock
DECREASE VALUE
Decreases value such
as temperature.
ADMIN MENU
Used only under
instruction by Strom.
PUMP RUNNING
While lit solid the pump is running and is
performing as expected.
FROST PROTECT
The boiler is too cold and is entering a defrost
cycle in attempt to prevent damage to the
boiler.
THERMOSTAT STATUS
While lit solid there is an external thermostat
tted and there is a demand for heat, while
ashing their is either no thermostat tted or
no demand for heat.
TEMPERATURE
Shows the
current
temperature of
the heating or
hot water.
CLOCK
Shows the
current time as
set during boiler
setup.
DATE
INDICATOR

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SYSTEM PIPING
Electric Boilers
The boiler must be installed by a competent and certied plumber or heating engineer and systems should be
designed to meet the current building regulations in force at the time of installation.
Strom Limited are not responsible for faulty installations which are performed by unqualied tradespeople.
DESIGN NOTES:
ISOLATION VALVES:
For ease of removal from the system, it is recommended that full bore isolation valves are tted on the ow and
return pipework from the boiler. Do not use standard ball valves, as this can restrict the ow in and out of the
boiler and result in detrimental performance.
AUTOMATIC AIRVENTS
An automatic air vent is already built into the boiler. However, if the boiler is to be used in tandem with a hot
water cylinder, an additional air vent should be tted in the vicinity of the cylinder coil. An airvent should always
be considered at the highest point in a system to aid in purging the system of any air.
AUTOMATIC BYPASS VALVE
An automatic bypass valve is integral to any system and MUST be installed as part of this installation. The
ABV should be tted to begin opening as the rst valve, radiator, or actuator shuts in the system, this stops
excess pressure from building in the system on the ow side. Failure to t and set the ABV can result in poor
performance and premature boiler failure.
WATER CONNECTIONS
For lling the heating system, reference should be made to BS EN 14336. There must be no connection
between the central heating systems and the main water supply, and all local water bylaws must be
observed. Any connection made between the mains water and heating system must be disconnected
after use.
WATER PURGES
Install purges in the radiators and any high points in the heating system to aid in removing air.
DRAIN POINT
A drain point should be tted at the lowest point of the heating system. It is not acceptable to drain the boiler
through a safety valve as debris can prevent the correct operation of the valve.
HEATING EXPANSION VESSEL
An expansion vessel is tted internally within the boiler to provide room for thermal expansion of water under
regular operating conditions. However, if the system contains signicant volumes of water, an additional heating
expansion vessel should be tted externally.

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PART L COMPLIANT LAYOUTS
Electric Boilers
HEAT ONLY BOILER
PROGRAMMER, ROOM THERMOSTAT & TRV’S - 2 PORT VALVE CONTROL (<150m2)
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING

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HEAT ONLY BOILER
PROGRAMMER, ROOM THERMOSTAT & TRV’S - 3 PORT VALVE CONTROL (<150m2)
PART L COMPLIANT LAYOUTS
Electric Boilers
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING

15
HEAT ONLY BOILER
PROGRAMABLE ROOM THERMOSTAT & TRV’S - 2 PORT VALVE CONTROL (<150m2)
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING

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HEAT ONLY BOILER
PROGRAMABLE ROOM THERMOSTAT & TRV’S - 3 PORT VALVE CONTROL (<150m2)
Electric Boilers
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
PART L COMPLIANT LAYOUTS
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING

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COMBINATION BOILER
PROGRAMMER, ROOM THERMOSTAT & TRV’S - 2 PORT VALVE CONTROL (<150m2)
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING

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HEAT ONLY BOILER
PROGRAMABLE ROOM THERMOSTAT & TRV’S - 2 PORT VALVE CONTROL (<150m2)
Electric Boilers
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
PART L COMPLIANT LAYOUTS
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING

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HEAT ONLY BOILER
PROGRAMMABLE ROOM THERMOSTATS & TRV’S (150m2+)
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING

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HEAT ONLY BOILER
MULTI CHANNEL PROGRAMMER, ROOM THERMOSTATS & TRV’S (150m2+)
Electric Boilers
DIAGRAMS PROVIDED AS GUIDANCE ONLY, FINAL DESIGN SHOULD BE DECIDED UPON BY A QUALIFIED
PLUMBER INLINE WITH CURRENT PART L GUIDELINES.
PART L COMPLIANT LAYOUTS
BOILER 2 PORT 3 PORT ABV WHEEL
HEAD
VALVE
LOCK
SHIELD
VALVE
THERMASTIC
RAD VALVE
ROOM
STAT
PROG
ROOM
STAT
MULTI
CHAN
PROG
TWO
CHAN
PROG
ONE
CHAN
PROG
CYL
STAT
JUNCT.
BOX
WIRING