REFRESH
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Maintenance
4.3
Fault Finding
4.3.1
Fault Finding Procedures
4.3.1.1 Filter Status Screens
When the stage filters become dirty the operation of the unit is reduced. If the stage filters are not
changed during the time (in HRS) shown on the countdown timer warning screen, then the system
will SHUT DOWN and the following screen is displayed.]
Screen Display - SYSTEM SHUTDOWN CHECK FILTERS
If an air flow pressure switch has been installed and the air pressure drops in the filter bank, the
following screen is displayed:
Screen Display - FAN STOPPED NO AIR FLOW
The following procedures show how to change and reset the filters when the system has shut
down:
Step 1:
Remove the stage filters which are displayed on the screen. Refer to the following
remove and replace procedures:
Step 2:
Remove the stage filters which are displayed on the screen. Refer to the following
remove and replace procedures:
Replacing Stage 5 Carbon Cells
Step 3:
Access the filter stage reset panel by opening the hinged access panels at the lower
front of the Services Tower.
Step 4:
To reset the stage filter which has been changed, press and hold the applicable reset
button on the front of the filter stage reset panel.
Note: The filter stages are given below the black reset button as 2, 3, 4 & 5.
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