Filter
Top Products
32
© Baxi Heating UK Ltd 2009
10.9 PCB (Fig. 54)
1. Pull off the two control knobs and disengage the
securing tabs of the cover. Undo the screws securing the
PCB.
2. Draw the PCB forwards and disconnect the wiring.
Transfer the two potentiometer drive pins to the new
PCB and replace in reverse order of dismantling.
3. Ensure that the wiring connectors are pushed fully on
to the PCB terminals.
10.10 NTC (Fig. 53)
1. Disconnect the 2 pin plug. Remove the clip retaining
the NTC in the heat exchanger pocket. Pull the NTC
out of the pocket.
2. Apply suitable heat transfer paste to the new NTC.
Replace in reverse order of dismantling, using the clip
previously removed. Ensure that the plug is fully engaged.
10.11 Safety Thermostat (Fig. 52)
1. Disconnect the two leads from the thermostat.
2. Remove the screws securing the thermostat to the
mounting plate on the flow pipe.
3. Replace in reverse order. The thermostat is not
polarised - either wire can fit either terminal on the
thermostat.
10.12 Float Switches (Fig. 55)
1. Remove the fan as described in Section 10.5,
paragraphs 1 to 5.
2. The two float switches are the same, but oriented
differently. The discharge switch is at the left, the safety
at the right.
3. To remove either switch disconnect the lead and pull
off the alignment bracket.
4. Undo the retaining nut. The sealing grommet will be
released from the sump body and allow the switch to be
removed.
5. Note the orientation of the alignment rib on the
switch. It is positioned uppermost on the safety float
switch and to the bottom on the discharge switch.
6. Take the new switch assembly and insert it into the
sump. Hand tighten the nut and slide the alignment
bracket in place to ensure the switch is in position.
Tighten the nut a further 2 turns.
7. Reconnect the lead to the switch, ensuring it is fully
engaged.
10.0 Changing Components
Discharge
Float Switch
Safety Float
Switch
PCB
Control Knobs
Safety Thermostat
Flow Pipe
Clip
NTC
Fig. 52
Fig. 53
Fig. 54
Fig. 55
Alignment
Bracket