Hitecsa CLOSE CONTROL CED Série Mode D'emploi page 46

M A I N T E N A N C E
Air-cooled condensers - Configuration 2 - 4.
The finned surface of the condensing coil must be cleaned at least once a month during the period that the system is in
operation, in order to avoid accumulation of dirt or other matter.
The cleaning operation can be done manually using a specific comb / brush or using a strong jet of cold water. It is advisable
to also effect a chemical cleansing once a year to remove encrustations and oily deposits. If too much dirt is allowed to
deposit, the system will be forced to operate at a higher pressure, reducing the cooling capacity of the indoor unit, and
increasing, even to a dangerous level, the condensing temperature.
High condensing pressure can provoke, as well as stopping the system, damage to the compressor.
The screws of the condenser fan should also be periodically tightened and the fan blades should be checked for corrosion or
cracks.
WARNING: particularly during the start-up and the first months of operation, it is very important to check
occasionally that all the pipe connections (on shut-off valves, filters, expansion valve, etc.) are tight. Vibrations dur
to the machine in operation and the changes in temperature can cause loosening of the screws in flaired pipe
connections and subsequent loss of refrigerant gas.
CHECKING THE FANS
To make sure that the fans are always in good working order, it is advisable that they are checked once a month.
Check the overall state of the fan, that there are no points of corrosion on the body (these should be cleaned and touched up
using a zinc based paint) and that the fan is tightly fixed to the body of the unit (not loose) and that there are no unusual
noises coming from the bearings.
In the case of CED units with belt drive fans, the state and the tension of the drive belt should be checked.
To modify the tension of the drive belt, one must adjust the position of the motor. To make this operation easier, the motor is
placed on guides (for sideways movement, to align the pulleys) and on a slide (for lengthwise movement, to tension the belt.
Each time that the belt tension is modified, check also the alignment of the pulleys. To ensure the pulleys are aligned, one
can use a simple ruler (see fig. 7).
If the pulleys have a different thickness, then act as in fig. 8.
WARNING : Insufficient tension - rapid wearing and breakage of the drive belt .
Excessive tension - rapid wearing of the motor bearings and of the fan bearings.
05.08 Ref.200989 Rev.100 47