VTS Medical Systems VENTUS COMPACT HP VVS021c Instructions For Use Manual page 99

damage to some components or subassemblies (motor, bearings, plastic parts, etc.) installed in
adjacent sections.
ELECTRIC HEATER
•
The electric heater battery consists of bare heating coils. During operation of the air handling unit,
when the heater is switched off, dust may settle on the heating coils. When the heater is restarted,
heavy contamination of the surface of the heater can generate unpleasant burning dust odours,
even leading to an initial fire hazard.
•
Check all electrical connections, the condition of the heating elements and the level of dirt on a
regular basis (every 4 months) and especially before the start of the heating season. Any dirt
should be removed with a hoover with a soft tip or compressed air.
•
The operation of the overheating protection system in the absence of air flow should also be
checked. The air flow velocity should not be less than 1.5 m/s.
FREON HEATERS AND COOLERS
•
Maintenance of the freon cooler covers the same range of operations as maintenance of the
heater and water cooler. Before washing the freon cooler with warm water, the cooling system
should be emptied by draining the freon into a container. Otherwise, there will be a risk of an
uncontrolled increase in freon pressure, causing damage to the cooling system.
EXCHANGER ROTARY
•
During maintenance operations on the rotary exchanger, check that:
o
the rotor turns freely. Excessive resistance may be caused by the sealing brushes being
pressed too far against the edge of the rotor. In this situation, adjust the brushes
accordingly. A worn seal must be replaced. If a previously removed seal is to be
reinstalled, it must be installed so that its direction is in line with the rotor's direction of
rotation. After replacing or adjusting the sealing brushes, the exchanger should be
allowed to run for 30 minutes to allow the brushes to fit to the rotor surface.
o
Check afterwards:
▪
motor current and compare it with the rated current to find out whether the motor
is overloaded.
▪
that the drive belt is not damaged and that it is clean and not slipping on the
cylindrical part of the rotor. If belt slippage still exists despite maximum tension
on the tensioning system, the belt should be replaced or shortened,
▪
that the air intake openings are not covered with dust or otherwise contaminated.
Any dirt should be removed with a soft-tipped hoover or compressed air.
•
The rolling bearings of the rotor and drive motor are lubricated continuously during operation. The
amount of grease in the bearings during installation of the exchanger is sufficient for long-term
operation and there is no need to lubricate the bearings during operation. It is recommended that
the motor and gearbox are cleaned of dust so that an insulating layer does not form on the motor
surface, which can lead to an increase in the operating temperature of the drive.
•
This exchanger should be inspected every four months and the inspection should cover the
technical condition as well as the level of fouling. The accumulation of dirt in the heat exchanger
fins is often limited to the first 50 mm in the exchanger. Prior to cleaning, adjacent sections of the
air handling unit should be protected from contamination.
•
The necessary cleaning should be carried out as follows:
o
using hoovers with a soft suction nozzle,
o
by blowing the ducts with a jet of air against the direction of normal air flow,
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