Replacing Controls - Worcester GREENSTAR 24i Junior Installation Instructions Manual

SERVICE AND SPARES

6.8.14 REPLACING CONTROLS

NOTICE:
B Do not replace the control unit if a
CO/CO analyser is NOT available.
2
The control unit is supplied within its plastic
housing. The complete unit must be
replaced.
Refer to figure 106.
1. Remove all electrical connections from the control
PCB including where cables run through restraints.
These can be unclipped from the plastic moulding
noting their position.
2. Carefully remove the system pressure gauge from the
fascia by parting the plastic retaining lugs securing
the gauge in place. Take care not to damage or kink
the capillary tube.
3. Remove the code plug. The code plug should be left
attached to the frame of the boiler by its plastic safety
thread.
3.
Fig. 106 Replacing the controls
Refer to figure 107.
1. Remove the three screws retaining the front fascia
making sure to support the fascia when removing the
last screw.
2. Remove the front fascia.
1.
1.
2.
Fig. 107 Fascia removal
58
1.
2.
1.
Refer to figure 108.
1. Using a suitable tool, press the button upwards.
2. Slide the control support bracket to the left.
2.
1.
Fig. 108 Control unit release
Refer to figure 109.
B Support the control and unclip control support cable
(1) from the boiler frame.
B Remove the support cable and fit to the new control.
B Remove appropriate cable restraints from the new
control box.
1
Fig. 109
B Fit control unit to the boiler.
B Re-connect support cable (1) to the boiler and all
electrical connections and system to the new control.
B Ensure that the code plug is re-fitted to the new
control. If this is not done, the boiler will indicate
an error and will not function.
B Replace the fascia to the new control and secure the
system pressure gauge back in the fascia.
NOTICE:
B After re-assembly, check the CO/CO
levels as described in section 6.6 air/gas
ratio setting.
6 720 644 741a (2010/10)
2