Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect one wire 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.
Continuity should then be measured across the two spades on the APS.
Notes:
100Pa (Pascals) = 1millibar
If continuity is not measured it is permissible
to increase the pressure by up to 50%
If continuity is measured make a note of the pressure required and
keep air pressure switch charge kit connected to air 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.
Continuity should then be measured across the two spades on the APS.
Notes:
100Pa (Pascals) = 1millibar
If continuity is not measured it is permissible
to increase the pressure by up to 50%
If continuity is measured make a note of the pressure required and
keep air pressure switch charge kit connected to air pressure switch.
Isolate as per TOPs P4
and refit as necessary