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Installation
5.2
Pipework positions and flue opening
CAUTION: Ensure there are no pipes, electric cables,
damp proof courses or other hazards before drilling.
Safety
All relevant safety precautions must be undertaken. Protective clothing,
footwear, gloves and safety goggles must be worn as appropriate.
Pipework positions
A to G (below) show the flue and pipe positions:
All dimensions in mm
454
337
A
35
B
65
C
94
D
121
770
726
667
639
609
582
Fig. 26
Pipework positions:
[A]
CH flow 22mm Ø copper (28mm Ø on 25/32kW model)
[B]
DHW flow 22mm Ø copper
[C]
DCW mains water inlet 15mm Ø
[D]
CH return 22mm Ø copper (28mm Ø on 25/32kW model)
[E]
Flue outlet
[F]
Pressure relief pipe 15mm Ø
[G]
Condensate outlet 21.5mm Ø
For servicing purposes, keep the condensate and
pressure relief discharge pipes away from components
and pipework connections.
Flue opening
▶ Follow figure 28 to mark the centre of the flue (1, & 2) for rear
opening, (2 & 3) for side opening or (1 & 4) for top opening.
All horizontal flue sections must rise away from the boiler
by 52mm per metre to ensure that condensate flows
back into the boiler for safe discharge via the condensate
waste pipe.
▶ Make an opening (X, Y or Z) through the wall using a core drill or
similar at a size relative to the wall thickness as shown below:
125mm Ø flue
Wall thickness mm
150 - 240
240 - 330
330 - 420
420 - 500
Table 6
22
145
E
E
F
G
52
19
415
Flue hole size Ø mm
155
160
165
170
X
Y
Fig. 27
3
145
X
+5
Fig. 28
[**]
IMPORTANT: for horizontal flues, increase this height by 5.2mm
for every 100mm of horizontal length that the flue opening is
away from the boiler.
Greenstar Heatslave II
Z
6 720 805 209-06.1TL
4
145
Y
1
340
Z
2
770**
ErP -
6 720 813 344 (2014/09)
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