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5.4
Flue installation
The flue can exit the boiler from outlets A, B, C or D for vertical (RS) and
horizontal (RS low or high level) flues to be fitted. (CF position 'A' only).
Refer to the separate flue installation instructions supplied with the flue
kits available for this boiler:
A
B
D
C
5
L
2
1
3
Fig. 33
[1]
Boiler outer casing
[2]
Outer flue tube
[3]
Outlet/elbow connection
[4]
Outside wall/roof
[5]
CF adaptor
[L]
Effective length of the flue
5.4.1
Flue damper installation
NOTICE: Fitting the flue damper
Failure to fit the flue damper, when required, will effect
the performance of the boiler and may cause "Lockouts"
The flue damper is only fitted to models stated in the
table below
Model range Output (kW)
12/18
13
15
18
18/25
18
21,5
25
25/32
25
28
32
32
Table 7
Greenstar Heatslave II
2022 +
6 721 843 978 (2022/01)
600mm
(min)
4
120mm
1
4
3
Flue damper fitted
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes 4m flue length
No > 4m flue length
Insert the flue damper into the inner tube of the straight extension or 90°
elbow and fit the flue as shown in figure 34. Ensure that the rubber seal
is fitted into the inner tube.
1
Fig. 34 Flue damper fitting
5.4.2
Installation notes
▶ If using an extension or horizontal terminal onto the boiler outlet,
remove the flue elbow retaining bracket [6].
WARNING: Escaping flue gases
The flue elbow and clamp may become loose.
▶ The flue elbow retaining bracket [6] must be fitted if
a flue elbow is used on the boiler outlet.
▶ When connecting a flue elbow [8] directly to the boiler flue outlet,
loosen the flue elbow retaining bracket screws [7] before fitting the
flue elbow. Insert the flue elbow with the flue retaining clamp [9]
loosely fitted, then tighten the bracket screws [7].
▶ Orient the flue elbow into the required position and secure with the
clamp.
▶ Ensure all flue seals are in good condition and seated properly.
▶ To ease assembly of flue components, grease seals lightly with the
solvent-free grease supplied.
▶ A clamp should be installed for every 1m and at every change of
direction.
The boiler is not designed to take the weight of the flue
system, this must be supported externally to the boiler.
8
6
7
Fig. 35
▶ All horizontal flue sections must rise by at least 52mm for each metre
(3°) away from the boiler to ensure that condensate flows back into
the boiler for safe discharge via the condensate waste pipe.
▶ The horizontal terminal must be installed at 3° to ensure that the
condensate drains back to the boiler whilst also preventing rain
ingress down the air duct.
Installation
9
6720820042-20.1Wo
29
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