Routine Maintenance - Friedrich KQ08J50A-B Service & Parts Manual

NOTE: Units are to be inspected and serviced by qualified service personnel only.
1. Clean the unit air intake filter at least every 250 to 300 fan hours of operation or when the unit's indicator light is on if
so equipped. Clean the filters with a mild detergent in warm water and allow to dry thoroughly before reinstalling.
2. The indoor coil (evaporator coil), the outdoor coil (condenser coil) and base pan should be inspected periodically
(yearly or bi-yearly) and cleaned of all debris (lint, dirt, leaves, paper, etc.). Clean the coils and base pan with a soft
brush and compressed air or vacuum. If using a pressure washer, be careful not to bend the aluminium fin pack.
Use a sweeping up and down motion in the direction of the vertical aluminum fin pack when pressure cleaning
coils. Cover all electrical components to protect them from water or spray. Allow the unit to dry thoroughly before
reinstalling it in the sleeve.
NOTE: Do not use a caustic coil cleaning agent on coils or base pan. Use a biodegradable cleaning agent
and degreaser.
Inspect the indoor blower housing, evaporator blade, condenser fan blade, and condenser shroud periodically
(yearly or bi-yearly) and clean of all debris (lint, dirt, mold, fungus, etc.) Clean the blower housing area and blower
wheel with an antibacterial / antifungal cleaner. Use a biodegradable cleaning agent and degreaser on condenser
fan and condenser shroud. Use warm or cold water when rinsing these items. Allow all items to dry thoroughly
before reinstalling them.
3. Periodically (at least yearly or bi-yearly): inspect all control components, both electrical and mechanical, as well
as the power supply. Use proper testing instruments (voltmeter, ohmmeter, ammeter, wattmeter, etc.) to perform
electrical tests. Use an air conditioning or refrigeration thermometer to check room, outdoor and coil operating
temperatures. Use a sling psychrometer to measure wet bulb temperatures indoors and outdoors.
4. Inspect the surrounding area (inside and outside) to ensure that the units' clearances have not been compromised
or altered.
5. Inspect the sleeve and drain system periodically (at least yearly or bi-yearly) and clean of all obstructions and debris.
Clean both areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and ensure
that the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as needed.
6. Clean the front cover when needed. Use a mild detergent. Wash and rinse with warm water. Allow it to dry
thoroughly before reinstalling it in the chassis.

Routine Maintenance

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