Worcester 70/90, Installation And Servicing Instructions

11.1 

After unpackaging the appliance it is recommended that all

cabinet  panels  are  removed,  as  described  in  Section  5,  and
stored  in  a  safe  place  to  avoid  damage  during  installation  and
allow  easy  inspection  for  any  leaks  after  the  system  has  been
filled.  Where  the  appliance  is  installed  close  to  a  wall  the  rear
panel may be discarded as this is supplied for cosmetic reasons
only.  This  will  then  allow  the  panels  to  be  easily  removed  if
access is required in the future.

11.2 

Remove the burner as described below and store in a safe

place until the appliance is ready for commissioning.

1. 

Remove  the  electrical  lead  plug  by  removing  the  electrical

facia and pulling the three pin connector free. Slide the locating
bush from the electrical box.

2. 

Remove the burner from the boiler by slackening the two M6

retaining  screws  located  in  the  burner  housing  ring  and  pulling
the burner clear. This will require the use of a 5mm allen key.

11.3 Flue system installation.

Install the appliance flue system as described in Section 7.

11.4 Heating system installation.
1. 

Plumb the boiler into the central heating system. 

2. 

Check that all unused sockets have been plugged.

3. 

Fill  the  system  and  vent  all  radiators  and  high  points  to

remove air from the system.

4. 

Check the boiler and all pipework connections for leaks.

5. 

The  primary  system  should  be  flushed  and  treated  in

accordance with the recommendations of BS 7593: 1992.

11.5 Oil supply installation 

(See Fig. 7).

Note:

Never  route  the  oil  supply  pipe/hose  directly  below  the

combustion chamber base.

1. 

Fit the oil supply pipe as described in Section 8. The pipe can

be routed down either side of the boiler in the gap between the
base tray and the boiler shell.

Note: 

Never use soldered joints on oil supply pipes as this could

cause a hazard in the case of a fire.

2. 

Fit  an  isolating  valve  at  the  end  of  the  oil  line  close  to  the

burner and ensure that the valve is closed.

3. 

Open the main oil supply valve at the tank and check for any

leaks.

4. 

Place a suitable container below the isolating valve and open

the valve.

5. 

Draw  off  at  least  2.5  litres  of  oil  until  a  steady  flow  of  clear

uncontaminated oil can be seen and turn off the isolating valve.

Note: 

This  method  may  not  be  possible  on  some  installations

where  a  sub-gravity  system  is  used.  Where  this  problem  arises
bleed the system using the oil pump as described in Section 12.6
and remove and clean the oil pump filter to remove any debris
collected as a result of installation.

11.6 

Replace  the  electrical  control  panel  and  side  panels  in

reverse order to the removal procedure of Section 5 and connect
the electrical supply as described in Section 10.

11. Installation

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