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Plume management system
5.2.9
Vertical plume discharge above roof/overhang
This type of installation is only used if it is not possible to terminate the
plume management kit in the normal manner.
▶ Ensure the discharge pipe is adequately supported as potentially the
majority of the discharge pipe extends past the roof/overhang.
▶ The discharge pipe must vertically clear the roof/overhang by a
minimum of 100mm.
▶ The discharge pipe must have a clearance of 300mm to a surface or
boundary line.
▶ If the supplied brackets are not long enough then third party 60mm
pipe brackets can be used.
1
3
4
2
6
2,000mm
1,000mm
52mm
104mm
≥300mm
≥300mm
100mm
≥140mm
≥140mm
Fig. 34 Vertical plume discharge above roof/overhang option
5.3
Determine the plume management system length
The maximum permissible length of the plume management for
Worcester Greenstar wall mounted condensing gas appliances is
4,500mm. The primary length of internal Condensfit II flue will be
reduced by fitting the plume management kit.
Refer to relevant appliance Installation instructions to determine the
appropriate plume length (M) versus the flue length (L).
The flue length is the effective length (L), which includes the effective
length of any elbows plus the straight flue lengths.
14
5
3
m m
0 0
≥ 3
Once the length L is known, find that value in the relevant appliance
Installation instruction to determine the maximum plume length (M)
allowed.
Fig. 35 Effective lengths determination
[L]
Effective flue length
[M]
Effective plume management length
Effective flue lengths versus plume management lengths
The graph for the appliances listed below detail the effective flue lengths
versus plume management lengths, for all other appliances the details
are in the Flue sections of the appliance Installation and maintenance
instructions.
The lengths for both plume and flue are the effective lengths, which
includes the effective length of any elbows plus the straight lengths.
Appliances covered
▶ For the CDi range of appliances including British Gas variants, the
available plume length [M] is reduced as the flue length [L] increases.
▶ The Si, i System, i Junior and Ri can use up to 4,500mm of plume
management regardless of flue length.
▶ Any flue must have a minimum of 500mm plume length.
The graph can be used to calculate:
• Effective flue length [L] if a specific effective plume length is
required.
• Effective plume length [M] if a specific effective flue length is
required.
Greenstar Condensfit II – 6 721 819 755 (2019/12)
0010031822 -001
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