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13

Energy saving

Greenstar Heatslave II External 

ErP

 – 6 720 813 722 (2014/09)

6

Energy saving

6.1

Tips on energy saving

Room thermostats

Reducing the setting of the room thermostat by 1°C can reduce 
fuel consumption by up to 10%.

New control systems

Upgrade your heating control system with the latest equipment 
available. The minimum level of control for a heating system is 
a programmer, interlocking room thermostat and thermostatic 
radiator valves.

Radiators

More often than not radiators will be sited underneath a 
window, so the warm air from the radiator heats the colder 
incoming air from the window.

The performance of the radiator will be affected if the curtains 
are allowed to drape over the radiator or shelves are fitted 
above it.

The positioning of furniture and tables in front of the radiator 
should also be avoided.

It is advisable to manually adjust all radiator valves every 2-3 
months to prevent them from sticking. It is also important that 
the plastic tops of all valves are always in position and not 
cracked or damaged to help prevent accidents. Care should be 
taken when vacuum cleaning carpets to avoid damage to valves 
and pipework.

The heating system and the outputs of the radiators have been 
carefully selected by your installer. The temperature 
obtainable in any given room is dependent on all radiators 
being operated at the same time. If you decide to turn off 
radiators in unused rooms, spare bedrooms etc., you may 
experience slightly lower room temperatures in rooms adjacent 
to unheated rooms.

Heating economically

The boiler is designed to provide a high level of comfort while 
keeping oil consumption and the resulting environmental effect 
as low as possible.

The central heating control on the boiler should be set as low as 
possible while still maintaining a comfortable room 
temperature.

The temperature of each room can be set individually using the 
thermostatic radiator valves (except the primary room with the 
room thermostat).

Roof insulation

Around 30% of the heat loss from a property is through the 
roof. Replace any old insulation with new insulation, preferably 
to a minimum thickness of 200mm.

Window frames

Single glazed windows, particularly those with steel frames, 
can lose a great deal of heat. 

Consideration should be given to replacement with PVCu or 
wooden framed double glazed units. 

Curtains

Lined curtains, or heavier full length curtains can provide 
excellent insulation. However, always ensure that the curtains 
do not drape over radiators.

Draughts

Try to ensure that draughts around doors, windows, 
letterboxes and keyholes etc., are reduced by using a suitable 
draught excluder.

WARNING: 

▶ Do not block or seal any air vents that are 

installed to ensure the central heating 
boiler (or other appliance) operate safely.

Summary of Contents for Greenstar Heatslave II External 12/18

Page 1: ...nsing boiler conventional flue and room sealed flue GREENSTAR HEATSLAVE II External ErP 12 18 18 25 25 32 6 720 805 212 00 1TL For sealed central heating systems with mains fed domestic hot water For use with Kerosene Class C2 only 6 720 813 722 2014 09 ...

Page 2: ...umed into heat offering you economical running costs and value for money It sits in ErP heating efficiency band A at the top of the energy rated boilers available There is also the assurance of our no nonsense parts and labour guarantee backed up by an optional servicing and maintenance contract to keep your boiler operating at peak condition and efficiency To find out more about Worcester Bosch G...

Page 3: ...ch can corrode the boiler and invalidate any warranty Fitting and modifications Fitting the boiler and any controls to the boiler may only be carried out by a competent engineer in accordance with the relevant Installation Regulations Flue systems must not be modified in any way other than as described in the fitting instructions Any misuse or unauthorised modifications to the boiler flue or assoc...

Page 4: ...ction manual after each service Have any work carried out only by a competent OFTEC registered engineer Always use original spares to help maintain the efficiency safety and reliability of the appliance 2 3 User caution Itisforbiddenforanyinterferencewiththeapplianceother than those actions allowed in this document 3 Using your boiler 3 1 Controls To access controls To access controls first remove...

Page 5: ...Central heating temperature control F Scroll up button G OK Select confirmation button H Scroll down button I Demand fault indicator blue J Position for optional programmer K Hot water heat store temperature control L Diagnostic port service engineer M System pressure gauge N Burner service mode button service engineer 6 720 805 211 01 1TL A B C D E F G H I J K N L M ...

Page 6: ...rm that the a central heating setting is being changed 3 The value is displayed during this process press to exit or after five seconds of inactivity the boiler display will return to the default screen Fig 3 Display symbols Screen display Description Explanation All possible screen symbols including greyed out symbols All possible screen symbols are displayed briefly during start up The greyed ou...

Page 7: ...e tank but it will not reheat the tank therefore the amount of water available is limited but is adequate for washing up filling basins etc We recommend that DHW is timed off overnight and when the homeis unoccupiedtosaveenergy Thetimershouldbesetfor at least half an hour before normal hot water demands are expected to reheat the heat store When reheating the heat store the controls will reclaim h...

Page 8: ...ewhenyourboileriscold areaA and thepumpisoff Theindicatedpressurewillchangeasthepump switches on for more accurate readings check pressure when the pump is not running Contact your installer or maintenance engineer if a permanent significant decrease or increase in pressure is indicated on the pressure gauge Filling loop If the sealed system pressure within your system drops to below 0 5 bar shown...

Page 9: ... the table below as an example see figure 8 fault codes E5 and 218 Contact Worcester Bosch Group for assistance and quote any fault codes displayed Fig 8 Boiler stops with no fault code In most cases these fault conditions will clear automatically when the associated fault clears e g waiting for an area of the boiler to cool down If the boiler fails to automatically reset itself after a period of ...

Page 10: ...r stops working blue light and warning triangle flashing and fault code displayed Internal error Press the Reset button and the boiler should restart if not call Worcester Bosch Group quoting fault codes Boiler stops with no fault codes Possible overheat Wait 30 minutes for boiler to cool Boiler stops working blue light and warning triangle flashing and fault codes 9F 855 are displayed Burner lock...

Page 11: ...nstalledonaflatlevelsurfacetoensurethat condensate does not enter the primary heat exchanger The cabinet is not load bearing and only provides weather protection for the boiler inside There must be sufficient hard standing and access around the boiler for servicing Installation servicing clearances Fig 9 WARNING External equipment operating at 230 Volts must not be serviced or repaired during adve...

Page 12: ...e boiler and system Use ofincompatible additives can cause damage andwillinvalidate the boiler guarantee Condensate drain This is a condensing boiler and the terminal will at times give out a plume of water vapour This is quite normal The boiler also produces quantities of condensate which is discharged regularly via a pipe to drain This pipe must not be blocked or altered in any way Clearances Se...

Page 13: ...tainable in any given room is dependent on all radiators being operated at the same time If you decide to turn off radiators in unused rooms spare bedrooms etc you may experienceslightlylowerroomtemperaturesinroomsadjacent to unheated rooms Heating economically The boiler is designed to provide a high level of comfort while keepingoilconsumptionandtheresultingenvironmentaleffect as low as possible...

Page 14: ... supplied by Bosch Thermotechnology Ltd Pleasereadthisguidecarefullytogainagoodunderstandingof the operation of your boiler In the case of a suspected fault refer to the fault finding section of this guide If in doubt contact our Technical Support In the event of an boiler fault or breakdown please contact our Service Department Your service administrator will arrange foranEngineertocallwiththemin...

Page 15: ...Record in the back of the Installation Commissioning and Servicing manual BoschThermotechnology Ltdwillnot accept responsibility fordamagecausedbyfaultyinstallation neglect misuseor accidentaldamage and non observance of theinstructions contained in the Installation and Users Instructions manuals The boiler has been used only for normal domestic purposes for which it was designed This guarantee ap...

Page 16: ...ndon Worcester WR4 9SW Tel 0330 123 9559 Worcester Bosch Group is a brand name of Bosch Thermotechnology Ltd worcester bosch co uk 6 720 813 722 2014 09 General checks before calling a Service engineer 1 Oil level in the tank 2 Power to the boiler 3 All control settings Please read the fault section of the manual before contacting our service team No boiler fault is found on over 30 of all service...

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