33
www.juwent.com.pl
15.5. FREON EVAPORATION COIL
At least every 6 months check whether cooling coil panels are not contaminated. Dust deposits on
the cooling coil surface reduce its capacity and increase pressure drop at the air side. Even if the unit
is equipped with filters, it is natural that at the air supply side dust will deposit on the cooling coil
panels. If excessive soiling is found, clean using the following methods:
»
using vacuum-cleaner with soft nozzle from the air supply side,
»
blowing compressed air jet in the direction opposite to the normal air flow, directing the air
jet in line with panel arrangement,
»
washing with water with cleaning agents which cause no corrosion to aluminium and copper.
Before cleaning provide protection of the adjacent unit sections against released dirt and dust.
When inspecting cleanliness, also make sure to check whether droplet eliminator is clean and
condensate tray drainage is operable, and so as the water siphon. Before the unit is started, fill
the water siphon with water. When contaminated, wash droplet eliminator with warm water with
detergents.
When washing freon evaporation coil with warm water remember to empty cooling system by
means of suction of freon into a tank. Otherwise high risk of uncontrolled increase in freon pressure
and damage of cooling system may be present.
15.6. ROTARY HEAT EXCHANGER
Servicing of the exchanger only involves an inspection of its technical condition and soiling of the
rotor to be carried out every six months. During service works related to the rotary heat exchanger
check whether:
»
the rotor runs freely; noticeable resistance may be caused by excessive pressure on seal
brushes and their rubbing against the rotor’s edge. Thus position of brushes should be corrected.
Replace any worn brush seals. If the previously removed brush seal needs to be remounted, pay
attention to install it so that its position against the rotor rotary direction remains unchanged.
Once seal brushes are replaced or adjusted, the heat exchanger should operate for 30 minutes
so that brushes can fit into the rotor surface. After that time measure the motor current and
compare it with the rated current to check whether the motor is not overloaded
»
drive belt is not damaged and whether it is clean and does not slide on the rotor cylindrical
part. If, despite maximum tension ensured by tensioning system, there is belt slack, shorten or
replace the belt,
»
air inlets are not covered with dust or otherwise contaminated. In order to clean the rotor use
one of the methods described above regarding other heat exchangers.
Rolling bearing on the rotor and drive motor are constantly lubricated while in use. The amount of
lubricant in bearings as for the moment the heat exchanger is being mounted, is enough to secure
their long service life and it is not necessary to lubricate them while in use. It is recommended to
clean the motor and gears of the dust deposits so that on the motor surface no insulation layer is
present causing increase in the drive working temperature.
15.7. SILENCING SECTION
Silencing section is fitted with removable splitters filled with non-flammable mineral wool absorbing
acoustic energy. In this case, maintenance works involve inspection whether cartridges on silencing
systems are not soiled. Cleaning should be carried out using a vacuum cleaner or by wet wiping of
all surfaces. To clean this section first remove removable splitters from the casing.
