Technical information

ManualsBrandsWarmFlow ManualsHeating SystemCOMBI 70

Combi 70 & Combi 90 Oil Boilers

Balanced flue options

3.9

1 Remove the insulation from the rear top panel (do

not discard it) and remove the blanking panel.

Discard the panel, but retain the nuts and washers.

2 Unscrew the protective covers from the studs on

the flue dress panel, supplied in the literature pack.

Place the panel in position in the rear case top

panel and secure in place using the washers and

nuts previously removed.

3 Cut the insulation into three equal pieces and

replace two - either side of the flue opening in the

case top panel.

4 Fit the flue dress plate to the hole in the rear

section of the case top.

5 Position the flue pipe into the boiler flue socket

and make good the connection using a suitable

flexible high temperature sealant (e.g. Silastic or

similar) and rope seal.

6 Position the rear section of the case top over the

first section of the flue, with the flue opening

towards the front of the boiler.

7 Replace the rear section of the case top.

1 Apart from a conventional flue/chimney, several

balanced flue options are available for use with the

Combi 70 & Combi 90 boilers.

a High level horizontal balanced flue - allows

the flue to rise between approximately 1.2 to

2.1 m above floor level before exiting through

the rear or side wall. It is adjustable to suit the

following wall thicknesses:-

Rear 215 to 450 mm (approximately)

Side 40 to 270 mm (approximately)

Extension kits are available which extend the flue

by 950 mm, 450 mm, 225 mm or 275 to 450 mm

telescopic.

b A vertical balanced flue kit - adjustable to 3 m

(maximum 6 m with extensions).

Extension kits are available which extend the flue

by 950 mm, 450 mm, 225 mm or 275 to 450 mm

telescopic.

A choice of two waterproof flashings (flat or

pitched) and a wall bracket are also available.

c Square low level horizontal balanced flue -

available in Short, Standard, Long and Extra

Long kits, adjustable to suit the following wall

thicknesses:-

3 - GENERAL BOILER INFORMATION

d Concentric (round) low level horizontal

balanced flue - available in Short and Standard

kits. Extensions are available which extend the

flue by 225 mm, 450 mm or 675 mm.

A 90° elbow is also available.

Connect a conventional flue

3.8

To suit wall thickness (mm)

70 and 90

Rear exit Side exit

Short Kit

Min. Max.Max. Min.

230

440

940

230

470

940

1500

n/a

245

750

n/a

330

750

1310

Square low level balanced

flue kits

Standard Kit

Long Kit

Extra Long Kit

The wall thicknesses quoted above for side flue

assumes that the boiler will be spaced off the wall by a

nominal 20 mm (to provide clearance for a heating

return connection plug). Water connections may be

taken from one side only, if required.

2 If the terminal is fitted within 1 m of plastic or

painted surfaces, a shield should be fitted to the

underside of the surface to protect it from the

combustion products.

3 The minimum dimensions for positioning the flue

terminal are shown in Fig. 11.

4 If the lowest part of the flue terminal is fitted less

than 2 m above a surface to which people have

access, the terminal must be protected by a guard.

A suitable guard is supplied with the Low level flue

kit.

The guard must be fitted centrally over the flue

terminal and securely fixed to the wall.

5 The terminal should be positioned so as to avoid

products of combustion accumulating in

stagnant pockets around the building or

entering into buildings.

6 The terminal position must be at least 1.8 metres

distant from an oil storage tank unless a wall with

at least 30 mins fire resistance and extending 300

mm higher and wider than the tank is provided

between the tank and the terminating position.