27
To remove the pressure switch
•
Access to the pressure switch is gained by first removing the fan. (See preceding text
- fan removal procedure).
•
Disconnect the wiring loom to pressure switch connector.
•
Remove the two pressure switch fixing screws, and carefully prise free the two
rubber sensing tubes whilst withdrawing the pressure switch from the fan box.
Note
: Ensure that the tube ends secured to the metal sensing pipes at the back of the box are not
disturbed.
Refer to figures 22 & 23 in section “Fan box installation”.
•
Replace in reverse order.
When replacing...
1. Ensure that the vacuum tubes are connected to the correct sensing points. The
positive sensing point (marked
⊕
on the switch) runs to the metal sensing pipe
positioned nearest to the side of the fan box. Note : When fitted correctly,
both leads will run neatly, but if incorrectly fitted, they will twist across each
other.
2. Ensure the electrical connector is correctly and firmly connected.
Pressure switch strip down
•
Remove the cover from the pressure switch to gain access. (See figure 48).
•
Disconnect the three leads, yellow, orange and white.
•
Replace in reverse order. Ensure that all three leads are firmly connected
Fig 48
