Mitsubishi Electric Thermoscreens VRF HP Installation, Operation & Maintenance Instructions Manual page 30

To access the Filter Indicator PCB to change jumper position:-
Switch off the electrical power to the Air Curtain. Remove the
Fixing
plastic end caps, inlet grilles and bottom access panel, see
screws
'To gain access inside the Air Curtain', Page 14.
Unfasten the two screws as shown in the picture at the left
hand end of the discharge grille.
Gently lower the left-hand end of the discharge grille,
supporting it from below. The Filter Indicator PCB is now
accessible to change the jumper position.
Jumper
Once the filter indicator PCB 'jumper' has been re-positioned,
push the discharge grille back up into place and re-fasten the
screws. Replace bottom access panel, inlet grilles and plastic
end caps in reverse order.
Final Check of the Unit
Replace the bottom access panel, air inlet grilles (with filters) and plastic end caps (see
'To gain access inside the Air Curtain', page 14).
Power-up both the Mitsubishi Electric City Multi system and the Air Curtain and re-check
the operation of the unit.
T9901075-2-3 UK Page 30 of 38