Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect one lead from the APS
Measurement:
Note the operating pressure indicated on the pressure switch.
Connect the air pressure switch charge kit to
+ve connection on the air pressure switch,
disconnect the -ve connection.
Ensure the performance tester reads 0mb.
Increase the pressure via the syringe to that
indicated on the pressure switch.
Short circuit resistance should then be measured across
the common and normally open terminals on the APS.
Notes:
100Pa (Pascals) = 1millibar.
If continuity is not measured it is permissible
to increase the pressure by up to 50%.
Connect the air pressure switch charge kit to
+ve connection on the air pressure switch,
disconnect the -ve connection.
Ensure the performance tester reads 0mb.
Increase the pressure via the syringe to that
indicated on the pressure switch.
Short circuit resistance should then be measured across
the common and normally open terminals on the APS.
Notes:
100Pa (Pascals) = 1millibar.
If continuity is not measured it is permissible
to increase the pressure by up to 50%.
Isolate as per TOPs P4
and refit as necessary