T R O U B L E S H O O T I N G - Hitecsa CLOSE CONTROL CED Série Mode D'emploi

T R O U B L E S H O O T I N G

INDICATIVE LIST OF THE MORE FREQUENT FAULTS THAT CAN CAUSE MACHINE MALFUNCTION
Even though all HITECSA units are fully checked and tested in the factory before they are shipped to site or to dealer's
premises, malfunctions can occur. Before applying the general Warranty Terms, it is imperative to ensure the entity of any
damage or malfunction and to determine its causes. Below is a list of the more frequent causes of damages or malfunction
that occur as a result of inadequate care after the units have left the factory. It is a good idea to check these before installing
or running the units.
• Breakage of the capillary tubes and of the pressure switch connections due to rough handling or excessive vibrations
during transport.
• Breakage of the piping within the refrigeration circuit as a result of rough handling on site.
• Loosened connections due to lack of maintenance.
• Clogged or dirty filters due to lack of start-up maintenance causing inadequate function of the refrigeration circuit.
• Dirt, particles, objects, etc. that have fallen into the cochlea of the fans.
• Incorrect fan motor current, resulting from a discordance between required available pressure and actual pressure
drop, or resulting from the fans being made to run with their front panel open.
• (The contractor installing the equipment must remember to check the power input of the fan motors).
• Contactors that do not close properly and remain noisy as a result of dirt or other deposits during storage of unit on
site.
• Activation of high pressure switch as a result of incorrect installation of the condenser or as a result of low air-flow or
as a result of excessive refrigerant gas load.
• Activation of low pressure switch because the A/C unit is operating with insufficient refrigerant gas, a low air-flow (dirty
or clogged filters), or because the air on the coil has lower temperature than the original design temperature.
• In air-cooled systems with a remote condenser, there can be frequent activations of the low pressure switch during
start-up or operation in Winter as a result of the refrigerant gas accumulating in the condenser. The entity of this
problem is reduced when the microprocessor controller is fitted to the A/C units since there is a delay on the
activation of the low pressure switch during start-up (see MICRO AC instruction manual).
•
It is advisable to install non-return valves on the pipes connecting the condenser in order to reduce this
problem, in particular when the condenser is in a position higher than the indoor unit.
50 05.08 Ref.200989 Rev.100