Daikin Clima-Flex CLIFC FIXED Series Installation, Operation And Maintenance Manual page 17

CLIFC FIXED - INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Maintenance (Cont'd.)
FANS
Inspection of the fan assemblies (comprising the impellor and the motor) should be undertaken to ascertain whether
any overheating of the motor is occurring, and to check that the fan impeller is free running and has not sustained
any damage.
The fan assembly should be cleaned regularly, as any excessive build-up of dust or debris may cause the impellor
to fall out of balance, or the motor to overheat.
The impellor and motor should only be cleaned with a soft dry brush to remove dust deposits.
The fixings holding the fan motor to the fan scroll should be checked and tightened if necessary. In addition, the
fixing screws holding the fan scroll to the main body of the equipment should also be checked and tightened as
required.
These fixings must be secure before checking the fan bearings. Standard fan bearings are "sealed for life", there-
fore no specific maintenance is possible. In normal service, the fans have an anticipated life of 40,000 hours.
However, the condition of the bearings should bechecked and assessed at regular intervals as follows:
The fan impellor should be rotated manually to detect any roughness or flat spots in the bearings. Gentle lateral
pressure should be applied back and forth on the impellor to detect any excessive movement or play in the bear-
ings. If any roughness, flat spots or excessive movement is found, then the fans should be replaced.
INTERNAL AND EXTERNAL SURFACES
All nuts, bolts and fixings should be checked for tightness.
The general condition of all components and the equipment overall should be checked.
The steel internal and external surfaces of the equipment should be regularly checked for scratches, corrosion, or
for peeling of painted surfaces.
If found, thoroughly clean affected areas with a wire brush, apply a coat of zinc rich primer or similar, and re-touch
with suitable finishing paint.
The insulating materials should be checked for condition and security. If the insulation shows signs of powdering
then it must be replaced. Insulation which is loose or peeling off should be made secure.
To replace insulation, proceed as follows:
1. Ensure that sufficient new insulation material with Class "O" fire resistance is available.
2. Peel off the existing affected insulation from the equipment casing.
3. Remove any old glue residues or residual foam.
4. Clean the area using suitable solvent cleaner such as ISO Propyl alcohol.
5. Position ETL / UL rated glue on the equipment casing, and press the new insulation into place. Let it cure and
dry..
IMPORTANT: ETL / UL rated glue MUST be used for the unit to maintain its ETL rating.
CLIMA-FLEX 17