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Page 115
Chapter 5: Maintenance
5.1.1.2 Cartridge Filters
Replaceable cartridge filters are held in place by an end cap in the bottom of the rear access panel. Lay the access panel down on
a piece of cardboard and remove the four screws holding the end cap in place. Remove the end cap and slide the old filters out
of the tray as shown in Figure 5-2. Slide the new filters into the tray and replace the end cap. Ensure the four screws are fully
tightened.
REAR ACCESS PANEL
END CAP
(4) SCREWS
Figure 5-2. Cartridge filters.
5.1.2 EC Fans
Periodic checks of the EC fans should include checking the wiring, fan motor mounts, housing, and impeller wheel. Ensure all
electrical connections are tight. Check that all mounting fasteners are secure and the impeller wheel is tightly mounted. The
impeller blades must be kept free of debris.
5.1.3 Coil
The coil should be inspected semi-annually and cleaned as required, following standard coil cleaning practices. Using a brush,
clean the coil fins of all debris that will inhibit airflow. This can also be done with compressed air or with a commercial coil
cleaner. Check for bent or damaged coil fins and repair as necessary. Check all refrigerant lines and capillaries for vibration
isolation and support as necessary. Check all piping for signs of leaks.
5.1.4 Drain Pans
To ensure proper drainage, inspect the drain pans regularly. Make sure the drain pan outlets are always free of debris so they
empty readily and ensure the drain pans do not leak.
WARNING
Do not use chloride-based water-conditioning additives in the condensate drain pans. This will cause corrosion to
occur on the coil fins.
5.1.5 Condensate Pump
The condensate pump should be inspected semi-annually and cleaned. Remove the pump as described in Section 5.3.4.2. Inspect
the water-level switch and ensure that the float works freely. Wipe the float with a wet cloth and detergent to remove dirt. Check
that the discharge line is open and water can pass through it freely.