Flue Systems Considerations; Flue Length; Flue Options - Worcester Greenstar 4000 Installation And Maintenance Instructions Manual

4.4

Flue systems considerations

WARNING
Flue systems
Possible flue gas escape
▶ Use Worcester, Bosch Group approved Condensfit II flue systems
only, no other manufacturer's flue have been tested or approved for
use with Worcester, Bosch Group appliances.
CAUTION
Concealed flue systems:
▶ Where a flue system is going to be concealed, provision must be
made for service and inspection.
▶ Voids containing concealed flues must have at least one inspection
hatch no less than 300mm square.
▶ Flue joints within the void must not be more than 1.5 metres from the
edge of the inspection hatch.
▶ Inspection hatches should be located at changes of direction.
▶ If this is not possible, bends should be viewable from both directions.
Refer to the manual supplied with the Worcester, Bosch Group flue kit for
complete installation instructions.
Flue kit part numbers
Part number Flue Ø Description
7 733 601 245 60/100 4000 SimpleSwitch flue adaptor 60/100
7 716 191 082 60/100 Telescopic horizontal flue kit
7 716 191 171 60/100 Extended telescopic horizontal flue kit
7 733 600 048 60/100 Horizontal high level telescopic flue kit
7 719 003 702 80/125 Telescopic horizontal flue kit
7 719 002 430 60/100 Vertical balanced flue kit
7 719 002 431 80/125 Vertical balanced flue kit
7 733 600 298 60/100 1050mm horizontal fixed flue kit
Table 12 Flue kit assembly part numbers
4.4.1

Flue length

Maximum horizontal flue lengths
Appliance
GR4700iW 30 C
GR4700iW 25 C
Table 13 Maximum flue lengths - Horizontal flues
Maximum vertical flue lengths
Appliance
GR4700iW 30 C
GR4700iW 25 C
Table 14 Maximum flue lengths - Vertical flues
Greenstar 4000 – 6 720 891 161 (2020/09)
Flue length [L] Flue length [L]
60/100 80/125
12,000mm 21,000mm
12,000mm 21,000mm
Flue length [L] Flue length [L]
60/100 80/125
12,000mm 21,000mm
12,000mm 21,000mm
Flue system bends
NOTICE
Effective flue lengths of bends:
Each bend used has an equivalent straight flue length.
▶ Refer to table 15.
Effective flue length
Bend 60/100
45° 0.5m
90° 1.5m
Table 15 Effective length of bends
NOTICE
Effective flue length of SimpleSwitch flue adaptor:
The SimpleSwitch flue adaptor has an equivalent straight flue length.
▶ Refer to table 16.
Effective flue length
60/100
4m
Table 16 Effective length of SimpleSwitch flue adaptor
4.4.2

Flue options

The systems have different maximum flue lengths, refer to the following
example flue options for those maximum flue lengths.
Horizontal high level flue assembly
Fig. 14 Horizontal flue option
• Flue length [L] (initial bend included in length calculation)
– 60/100 = 202 - 603mm
– 80/125 = N/A
Pre-Installation
80/125
0.5m
1.5m
80/125
N/A
60/100 mm
383 mm - 603 mm
130 mm Min
19