Worcester 18/25 Instruction Manual download pdf (Page 14)

• This boiler is only suitable for installing

internally within a property at a suitable

location onto a fixed rigid surface of the same

size as the boiler and capable of supporting

the boiler weight.

• The boiler must be installed on a flat level

surface to ensure condensate does not enter

the primary heat exchanger.

• The boiler is not suitable for external

installation unless a suitable enclosure is

provided.

• Roof space installations must fully conform to

BS 5410 part 1 section 4.6.9.

Open flue model (CF):

• In order to ensure clean and efficient

combustion an adequate supply of air must

be delivered to the combustion chamber.

• To provide sufficient air a suitable inlet must

be provided into the room or space in which

the boiler is situated, minimum size 138cm

for 18/25kW appliances.**

An air brick or other form of continuous air

supply may have to be built into the installation

in order to ensure an adequate supply of air.

• If the appliance is to be installed in a confined

space or compartment two air vents are

required, one at high level and one at low level.

The minimum free area of each vent is

shown opposite and depends whether the

air is taken from another room or from

outside the building.

• Where the air is taken from another room that

room must contain an air inlet as described

above.

Room sealed balanced flue model (RS):

The appliance does not require a separate vent

for combustion air.

• Installation in cupboards or compartments

require permanent vents for cooling purposes,

one at high level and one at low level, either

direct to outside air or to a room.

• Both vents must pass to the same room or be

on the same wall to the outside air.

The minimum air vent free area is given in the

table opposite.

a: INSTALLATION CLEARANCES:

Diagram (a) shows the minimum space

recommended to install the boiler only.

b: SERVICE CLEARANCES:

Diagram (b) shows the minimum space

required to carry out an annual service.

c: MAINTENANCE & REPAIR CLEARANCES:

The appliance is suitable for an under worktop

installation providing that the worktop above the

boiler (min 10mm clearance) is removable for

maintenance and repair and the front of the

boiler is not enclosed.

* Remove the flue 'knock-out' panel sections if

this clearance is less than 75mm.

** Due to changes to BS 5410 and modern

building design, these figures no longer

incorporate the adventitious ventilation allowance.

BOILER LOCATION & CLEARANCES

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR DANESMOOR UTILITY 18/25

8 716 106 256C (03/2010)

PRE -

INSTALLATION

BOILER LOCATION &

CLEARANCES

600mm

300mm

100mm

570mm

1200mm

1155mm

a: RECOMMENDED

INSTALLATION CLEARANCES

b: ANNUAL SERVICE CLEARANCES

600mm

10mm

5mm*

380mm

1200mm

895mm

c: MAINTENANCE & REPAIR

CLEARANCES

600mm

300mm

5mm*

380mm

1200mm

1155mm

MINIMUM AIR VENT AREA (cm

) FOR APPLIANCES INSTALLED IN A COMPARTMENT:

Internal air to and from a space/room inside the building.

External air to and from directly outside the building.

External

ventilation

High Low

Level Level

138 275

Conventional flue:**

Internal

ventilation

High Low

Model Level Level

18/25 275 413

Room Sealed flue:**

Internal

ventilation

High Low

Model Level Level

18/25 275 275

External

ventilation

High Low

Level Level

138 138

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Worcester 18/25 Instruction Manual Page 14

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