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12.0 Changing Components
37
12.18 Pressure Relief Valve (Fig. 64)
1. Drain the primary circuit.
2. Disconnect the discharge pipe from the valve. Using a
suitable hexagon key undo the grub screw sufficiently to
release the valve.
3. Note the orientation of the valve, rotate it and
withdraw it from the manifold.
4. Fit the new valve and ‘O’ ring seal and set to the
previously noted orientation. Reassemble in reverse
order.
12.19 P.C.B. (Fig. 66)
1. Note the settings of the temperature control knobs.
Rotate the knobs fully anticlockwise and carefully pull
them off the drive pins.
2. Completely undo the screws securing the control box
cover and release the cover retaining barbs from their
slots. Disengage the rear of the cover from the control
box hinge pin (Fig. 65).
3. Note the position of all plugs and wires on the P.C.B.
and disconnect them.
4. Undo the securing screws and remove the P.C.B.
Transfer the control knob drive pins to the new P.C.B.
and turn them fully anticlockwise.
5. Reassemble in reverse order, ensuring that the
temperature controllers are reset to their previous
positions.
12.20 Selector Switch (Fig. 66)
1. Turn the selector switch knob to the off position and
carefully pull it off the facia.
2. Completely undo the screws securing the control box
cover and release the cover retaining barbs from their
slots. Disengage the rear of the cover from the control
box hinge pin (Fig. 65).
3. Note the position of the electrical connections and the
orientation of the switch. Remove the electrical
connections.
4. Remove the screws securing the switch to the facia
panel.
5. Fit the new switch and reassemble in reverse order.
Turn the knob to the required setting.
Pressure Relief Valve
Grub Screw
‘O’ ring seal
Discharge Pipe
Control Box Cover
P.C.B.
Selector
Switch
Facia
Selector Switch Knob
Temperature Control Knobs
Fig. 64
Fig. 65
Fig. 66
Drive Pins