44
14.0 Changing Components
© Baxi Heating UK Ltd 2013
14.16
Pressure Gauge (Figs. 78 & 79)
1. Drain the primary circuit and undo the nut on the pressure
gauge capillary.
2. Undo the screws securing the gauge retaining bracket.
3. Remove the bracket and gauge assembly. Depress the barbs
on the side of the gauge and remove the retaining bracket.
4. Examine the sealing washer, replace if necessary.
5. Reassemble in reverse order.
14.17
Pressure Relief Valve (Fig. 80)
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.
14.18
P.C.B. (Fig. 82)
1. Note the settings of the temperature control knobs, rotate
them 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. 81).
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.
14.19
Selector Switch (Fig. 82)
1. Note the setting of the selector switch knob 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. 81).
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, ensuring that it is correctly positioned and
reassemble in reverse order.
Pressure Gauge
Gauge Retaining
Bracket
Fig. 79
Fig. 78
Fig. 80
Pressure Gauge
Capillary
‘O’ Ring
Seal
Discharge Pipe
Grub Screw
Control Box Cover
P.C.B.
Selector
Switch
Facia
Selector Switch Knob
Temperature Control Knobs
Fig. 81
Fig. 82
Drive Pins