Worcester C1 Installation And Servicing Instructions Download

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12.1

Remove the appliance cabinet by removing the screw at

the top centre of the cabinet.
Check that the electrical supply and the gas supply to the
appliance are turned off and that all the water connections
throughout the system are tight.
Open the system valves at the appliance. Refer to Fig.6.
Open all the radiator valves. Remove the automatic air vent cap.
Refer to Fig. 34.

Fill the system through the external filling loop. Refer to Section
7, Sealed System.

For optimum performance after installation, this boiler

and  its  associated  central  heating  system  must  be  flushed  in
accordance  with  the  guidelines  given  in  BS7593:1992,
'Treatment  of  water  in  domestic  hot  water  central  heating
systems'.
This must involve the use of a proprietary cleaner, such as Betz
Dearborn's  Sentinal  X300  or  X400,  or  Fernox  Superfloc.  Full
instructions  are  supplied  with  the  products,  but  for  immediate
information, please contact  Betz Dearborn on 0151 420 9563 or
Fernox on 01799 550811.
For  long  term  protection  against  corrosion  and  scale,  after
flushing,  it  is  recomended  that  an  inhibitor  such  as  Betz
Dearborn's Sentinal X100 or Fernox MB-1 is dosed in accordance
with guidelines given in BS7593:1992.
Failure to implement the guidelines may invalidate the warranty.

Vent  each  radiator  in  turn.  The  automatic  air  vent  will  vent  the
appliance. Refer to Fig 34.
Remove the cap from the pump and turn the shaft about half a
turn. Replace the cap. Refer to Fig 35.
Check that the pressure relief valve operates by turning the knob
anti-clockwise until it releases. Lower the facia to gain access to
the  relief  valve.  Refer  to  Fig  17.  Water  should  be  expelled  from
the discharge pipe.
12.2 Set the Expansion Vessel Pressure
The  charge  pressure  of  the  expansion  vessel  as  dispatched  is
0.5bar,  which  is  equivalent  to  a  static  head  of  5m  [17ft].  The
charge  pressure  must  not  be  less  than  the  static  head  at  the
point  of  connection.  A  Schraeder  type  valve  is  fitted  to  the
expansion vessel to allow the charge pressure to be increased if
necessary. Refer to Fig 34. The expansion vessel must be charged
to 0.35bar less than the initial system design pressure.
Note: 1bar = 10.2m = 33.5ft of water.

12.3

Set the System Pressure

Fill the system until the pressure gauge is at 2.5bar and check for
leaks.
Release  water  from  the  system  using  the  relief  valve  test  knob
until the required system pressure is obtained, upto a maximum
of 1.5bar.
Set  the  pointer  on  the  pressure  gauge  to  record  the  set  system
pressure.
If  the  pressure  indicated  on  the  gauge  is  greater  than  2.65bar
when  operating  at  the  maximum  central  heating  temperature,
an extra expansion vessel must be fitted to the system as close
as possible to the appliance central heating return connection.
The  appliance  [as  despatched]  can  accommodate  a  system
volume  of  100  litres  with  a  system  pressure  of  0.5bar.  Refer  to
BS7074  Part  1,  BS5449  and  Table  8.  If  the  system  volume  is
greater then an extra vessel must be fitted as close as possible to
the appliance central heating return connection and pressurised
to the same figure as the integral vessel.

12.4

Clock/Programmer: The controls fitted to the appliance

should be set up at this stage.

12.5

Check that the gas and electricity supplies are turned off.

Connect a pressure gauge to the gas valve burner pressure test
point. Refer to Fig 36.

12. Commissioning The Appliance

Fig.34. Automatic air vent and combustion

test point

Fig. 35. Pump venting.

Pump

Pump cap