EN
UAB AMALVA we reserve the right to make changes without prior notice
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Besides preventive maintenance inspection, the following operations should be performed:
1. Rotary Heat Exchanger Check.
Inspection of the rotary heat exchanger is performed once per year. Free
rotation of the rotary heat exchanger, continuity of the rotating belt, absence of damages of the rotor drums
and the seal gasket are checked. It is necessary to check the stretch of belt. Free belt will slide and the ef-
ficiency of rotary heat exchanger will fall down. To reach maximal efficiency, rotor must turn at least 8 times
per minute. Polluted heat exchanger will decrease efficiency. Clean heat exchanger with an air blast or wash
with tepid water. Check out water falling on the electric motor.
Heat Exchanger Washing.
If rotor cleaning by compressed air is not effective, it can be washed with soap-
suds (11 Picture), or if needed – use degreasing soak for metal (aluminum) cleaning. Check out water falling
on the rotor’s electric motor and other automatics’ elements. In case if water got into details, they must be
urgently dry up. Leave rotor to dry in a warm place. Rotor can be connected only when it is absolutely dry.
Heat Exchanger Washing
11 Picture
2. Fans check
(once per year). Polluted fans decrease efficiency.
Before performing any inspection work, check whether the unit is switched
off from the electric power supply.
Fans should be carefully cleaned with textile or soft brush. Do not use water. Do not break balance. Check if
direction of fan turns is right, because wrong direction of turns gives only 30 % of rating. Check if fan freely
rotates and is not mechanically damaged, if impeller does not touch suction nozzles, fan does not spread
noise, the pressure tubes are connected to the nozzle (if required), mounting bolts are screwed.
3. Air heater check.
Recommended to perform periodical inspection and cleaning of heater. Check the plates
of water air heater. The air heater is cleaned with hoover from supply air side or with air blast from exhaust air
side. If it is very dirty, wash with tepid water, which will not make corrosion of aluminium. Check if position of
return water temperature sensor is right. Check if electric air heater is properly fixed, wires connections are
not damaged and heating elements are not bent. They can be damaged or bent due to uneven heat or uneven
and turbulent air direction. Check if electric air heater is clear of unnecessary things and heating elements are
not clogged, because this can cause unpleasant smell or in the worst case – dust can start burning. Air flow
through the air heater should be greater than 1,5 m/s. Heating elements can be cleaned with hoover or wet
textile.
4. Air filter clogging check.
Change air filters when air filter clogging is indicated. We recommend to change
filters at least twice per year: before and after heating season, or more
1
.
Filters are one time used. We do not recommend cleaning them. Stop the air handling unit before changing
filters.
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Clogged filters unbalance ventilation system, air handling unit uses more power.
