VTS Medical Systems VENTUS COMPACT HP VVS021c Instructions For Use Manual page 98

AIR FILTERS
•
Under standard operating conditions for air handling units, filters should be changed
approximately twice a year. The need to change the filter (in addition to visually visible
contamination) is also indicated by a drop in pressure:
o
EU4 - 150Pa,
o
EU5, EU7 - 200 Pa,
o
EU9 - 300 Pa
•
If the final differential pressure exceeds the design value, the filter must be replaced. The filters
are disposable components.
•
When replacing the filter, the filtration section should also be cleaned - either with a hoover or
by dry cleaning.
•
When ordering a new filter set from an authorised VTS office, specify the type of filter, the
filtration class, the size of the air handling unit and, if necessary, the size of the filter, as specified
on the technical data sheet or in the "AIR FILTERS" section.
•
Incorrect or contaminated filters can cause an increase in the power consumption of the fan
motors, leading to damage to the drive motors.
WATER HEATER
•
Active water heaters should be equipped with anti-freeze systems. Optionally, a non-freezing
heating medium (e.g. glycol solution) can be used in winter. If the heating medium is cut off or the
air handling unit is at a standstill, and if the air temperature is likely to fall below + 5°C, the heater
should be drained. To do so:
o
close the heating medium inlet and outlet valves (isolate the heater from the heating
system),
o
remove the inspection panel,
o
unscrew the drain and remove the vent plug from the collectors,
o
connect the output hose to a drain, allowing water to run off the drained exchanger
outside the unit,
o
blow compressed air through the vent plug into the heater,
o
repeat this procedure several times in short intervals until there are no visible drops of
water coming out of the drain hose,
o
screw the drain plug and vent plug back in.
•
Check the level of dirt on the heater plates at least once every four months. Dust settling on the
surface of the heater causes a deterioration of its heating power and leads to a pressure drop on
the air side. Even if the air handling unit is equipped with filters, over time dust, supplied with the
delivered air, settles on the heater plates. If the plates become dirty, their cleaning should be
carried out in one of the following ways:
o
using a hoover with a soft suction nozzle on the air inlet side,
o
by blowing with a jet of compressed air against the direction of normal air flow, directing
the jet parallel to the tiles,
o
washing with warm water and non-corrosive cleaning agents for aluminium or copper
components.
•
Protect adjacent sections of the air handling unit from contamination before cleaning.
•
In order to achieve the maximum heating capacity of the heater, it must be well vented. For this
purpose, vent plugs have been designed, located on the heater manifolds.
•
When the unit is stationary, the flow of the heating medium should be limited to a minimum so
that the temperature inside the unit does not exceed +60°C. Exceeding this value could cause
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