Daikin Air Handler CAH010GDDC

WARNING: Before servicing fans, lock out and tag out all power to the unit. Fans or belts can cause severe personal injury or death

WARNING: Do not open the hinged access door and screw-fastenerd access panels while the unit is operating. Moving parts and strong suction forces can cause severe personal injury or death

Replace the variable pitched motor sheave with a properly sized, fixed sheave after air balance

Replace the adjustable sheaves with fixed sheaves

Measure the diameter of the V-belt outer surface where it passes around the sheave (pitch diameter)

Calculate fan speed from the motor nameplate rpm

Sign off on the fan drive maintenance

Warning: Moving belt and fan can cause severe personal injury or death. Always ensure safety measures are in place.

Is the belt tension at the lowest tension at which the belt does not slip under peak load conditions?

Measure the force applied to the belt tension checker

Does the measured force match the required values?

Is the belt free from foreign material that can cause slippage?

Is the V-drive in good condition?

Are the belt and fan guards on plenum fan units always in place?

Is the fan locked and tagged out to prevent accidental start up?

Freezing point of antifreeze solution

Remove and Replace Components of Coils

Power to the unit locked out and tagged out?

Fan assembly removed and replaced?

CAUTION: Sharp fin edges are a potential injury hazard. Avoid contact with them

To obtain maximum performance, the coil must be clean

Check once a year under normal operating conditions and, if dirty, brush or vacuum clean.

Use a chemical coil cleaner on multiple row coils

Read and follow the chemical cleaner's instructions as some cleaners may contain harsh chemicals

Take care not to damage fins while cleaning.

Filters removed from inside the unit

Wire clips rotated to release filters

Clean filters fully seated in the frame

Pressure drop for installed filters

Typical filter pressure drop for clean filters at rated air flow

Final pressure drop for front loaded filters

Prefilters removed to check the pressure drop of the final filters