Baxi Megaflo System HE IE Series Installation & Servicing Instructions Manual page 21

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1. The condensate outlet will accept 21.5mm (¾in) plastic overflow pipe which should generally discharge internally into the household drainage
system. If this is not possible, discharge into an outside drain is acceptable.
2. Ensure the discharge of condensate complies with any national or local regulations in force.
BS 6798 & Part H1 of the Building Regulations give further guidance.
3. The discharge pipe should be run in a proprietary drain pipe material e.g. PVC, PVC-U, ABS, PVC-C or PP.
4. Metal pipework is NOT suitable for use in condensate discharge systems.
5. The pipe should be a minimum of 21.5mm diameter and must be supported using suitably spaced clips to prevent sagging.
6. It is advisable to keep the condensate pipe internal.
7. External runs greater than 3 metres or runs in cold areas should use 32mm waste pipe.
8. If the boiler is fitted in an unheated location the entire condensate discharge pipe should be treated as an external run.
9. In all cases discharge pipe must be installed to aid disposal of the condensate. To reduce the risk of condensate being trapped, as few
bends and fittings as possible should be used.
10. When discharging condensate into a soil stack or waste pipe the effects of existing plumbing must be considered. If soil pipes or waste
pipes are subjected to internal pressure fluctuations when WC's are flushed or sinks emptied then back-pressure may force water out of the
boiler trap and cause appliance lockout.
Examples are shown of the following methods of termination:-
i) to an internal soil & vent pipe
ii) via an internal discharge branch (e.g. sink waste)
iii) to a drain or gully
iv) to a purpose made soakaway
page 16
7.8 Flue
NOTE: Due to the nature of the boiler a plume of water vapour will be
discharged from the flue.
This should be taken into account when siting the flue terminal.
1. The following guidelines indicate the general requirements for siting balanced flue terminals. For IE recommendations are given in the current
edition of I.S. 813 "Domestic Gas Installations".
2. If the terminal discharges onto a pathway or passageway, check that combustion products will not cause a nuisance and that the terminal
will not obstruct the passageway.
3. If a terminal is less than 2 metres above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal
guard must be provided.
IMPORTANT:
Under car ports we recommend the use of the plume
displacement kit.
The terminal position must ensure the safe and nuisance - free
dispersal of combustion products.
Terminal Position with Minimum Distance
1
Directly below an opening, air brick, opening windows, etc.
A
1
Above an opening, air brick, opening window etc.
B
1
Horizontally to an opening, air brick, opening window etc.
C
2
Below gutters, soil pipes or drain pipes.
D
2
Below eaves.
E
2
Below balconies or car port roof.
F
2
From a vertical drain pipe or soil pipe.
G
2
From an internal or external corner.
H
I Above ground, roof or balcony level.
J From a surface or boundary line facing a terminal.
K From a terminal facing a terminal (Horizontal flue).
From a terminal facing a terminal (Vertical flue).
L From an opening in carport (e.g. door, window) into the dwelling.
M Vertically from a terminal on the same wall.
N Horizontally from a terminal on the same wall.
R From adjacent wall to flue (vertical only).
S From an adjacent opening window (vertical only).
T Adjacent to windows or opening on pitched and flat roofs.
U Below windows or openings on pitched roofs.
1
In addition, the terminal should be no nearer than 150 mm to an opening in the building fabric formed for the purpose of accommodating a built-in
element such as a window frame.
(Fig. 9) (mm)
300
300
300
25 (75)
25 (200)
25 (200)
25 (150)
25 (300)
300
600
1200
600
1200
1500
300
300
1000
600
2000