Ravenheat 780 Series, Instructions For Use Installation And Servicing

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Fig. 6

NOTE

: The flue must be terminated in a place not 

likely to cause a nuisance.

4.6.2

   A concentric vertical flue kit is available for 

flueing applications up to a maximum height of 
4 metres.

For further details see vertical flue installation 
instructions.

4.7 AIR 

SUPPLY

4.7.1

  The following notes are intended for general 

guidance.

The room sealed fan flued boiler does not 
require a permanent air vent for combustion 
air supply.

When installed in a cupboard or compartment 
ventilation is not required.

4.8 

WATER CIRCULATION (central heating)

4.8.1

 Detailed recommendations are given in 

BS 6798:1987/5449:1990 (for smallbore 
and microbore central heating systems). 
The following notes are given for general 
guidance.

4.8.2 Pipework

Copper tubing to BS 2871 1.1.1971 is 
recommended for water pipes. Jointing should 
be either with capillary soldered or with 
compression fittings.

Where possible pipes should have a gradient 
to ensure air is carried naturally to air release 
points and water flows naturally to drain taps. 
It should be ensured as far as possible that 
the appliance heat exchanger is not a natural 
collecting point for air except where providing 
useful heat, pipes should be insulated to 
prevent heat loss and to avoid freezing. 
Particular attention should be paid to pipes 
passing through ventilated spaces in roofs and 
under floors.

4.8.3 

  An automatic system by-pass is included 

within the boiler. The boiler is suitable for use 
in system with thermostatic radiator valves 
and additional by-pass is required.

4.8.4

System design

Fig. 7 illustrates typical heating only layout. 

            Figs. 9 and 10 iluustrates typical layout with   
            “Y” or “S” plan system.

Terminal position for fan assisted boiler

 (minimum distance)                   mm  

A - 

Directly below an open window or other opening (e.g. air brick)           300

B - 

From a vertical structure on the roof                    

                          150

C - 

Below eaves                                                            

                          200

D - 

Below balconies or car port roof                                                            200

E - 

From a vertical drain pipes and soil pipes               

                          150

F - 

From an internal or external corner                                                       100

G - 

Above ground or below balcony level                  

                          300

H - 

From a surface facing a terminal                         

                          600

I - 

From a terminal facing the terminal                      

                        1200 

J - 

From an opening in the car port  (e.g. door window) into dwelling     1200

K - 

Vertically from a terminal on the same wall         

                        1500

L - 

Horizontally from a terminal on the same wall     

                          300 

M - 

Above an opening, air brick, opening   

 windows etc...

                         300

N - 

Below gutters, soil pipes or drain pipes

                          75

P - 

Above intersection with roof                  

                         300