Ravenheat 780 Series, Instructions For Use Installation And Servicing

Fig. 34

24

5.11  SAFETY VALVE DISCHARGE AND 

CONDENSATE DRAIN CONNECTION.

5.11.1

  The safety valve is located on the return 

manifold.The discharge should  terminate 
facing downward exterior to the building in a 
position where discharging (possibly boiling 
water & steam) will not create danger or 
nuisance, in a easily visible position, not to 
cause damage to  electrical components or 
wiring.

The discharge must not be over an entrance 
or a window or any other type of access.

5.12 ELECTRICAL 

CONNECTIONS

5.12.1 IMPORTANT:

 Electricity supply must be as

specified in clause (sect. 4.10).

- When controls external to the appliance 

are required, design of the external 
electrical circuits should be undertaken by 
a competent person. In accordance with the 
IEE wiring regulations.

It is essential that all external controls 

must be volt free.

  Factory fitted internal wiring must not be 

disturbed when wiring external controls.

-  There are the control board, where the 

terminals are easily visible in fig. 36, and 
the terminal board (fig. 1) whwre to connect 
the cylinder thermostat and the diverter 
valve (fig. 36/a).

- 

Heat resistant flexible cable is fitted 
between the isolator and the terminal block 
A 3 core cable of 0.75 mm

2

 (24x0,2 mm) to 

BS 6500.

  Make sure all wires to the appliance are 

routed away from sharp edges and hot 
surfaces.

  The cable must be fastened with its cord 

anchorage and connected so that should the 
cable slip from the anchorage the current 
carrying conductors becomes taut before 
the earthing conductor. Securely tighten all 
terminal screws and arrange the cable with 
slack between the cord anchorage and the 
terminal block. 

  WARNING: If the supply cord is damaged, 

it must be replaced by a service engineer 
(supply cord available from Ravenheat 
Manufacturing Ltd).

5.11.2 

The condensate drain connection is on the 
left of Gas service cock (Fig.34).

               A 25 mm plastic overflow pipe is fitted on 

the condensing trap and should be used 
to fit on the drain connection, if required, 
to discharge condensate to a drain. The 
drain pipe should have a fall of a least 2.5° 
away from the boiler. Condensate should, if 
possible be discharged into the household 
internal drainage system.

              If this is not practicable, discharge can be 

allowed into the external  household drains 
or a purpose designed soak away.

              It is recommended that any external 

condensate drain pipe is insulated and also 

              preferably of 32 mm diameter, to prevent 

freezing in adverse weather conditions.

              The condensate is discharged periodically 
               in “ slugs” by siphonic action. It is not 

necessary to provide air breaks or extra 
traps in the discharge pipe as there is 
already a 125mm high trap inside the boiler.

               Fitting an extra trap may cause the boiler 

siphon to work incorrectly.

              Refer to BS5546 or BS6798 for advice on 

disposal of boiler condensate.