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8.4 Electrical installation
Constant drive
The drive motor is electrically connected at the factory (in
Y-circuit). The motor must be correctly fused. The direction of
rotation can be reversed by exchanging the phases.
Variable-speed drive
The control unit is supplied with the unit. The motor must
be wired to the control unit and the control unit must be
connected during installation.
8.5 Assembly of segmented rotary heat exchangers
The installation manual for segmented wheels can be
downloaded from the internet. To ensure correct function the
installation supervision by a Hoval technician or an author-
ised supplied is recommended.
8.6 Storage
■ Rotary heat exchangers with motors must be stored in a
dry, dust-free area which is free of vibrations.
■ Long periods of standstill can impair the function of gear
motors because after some time the bearings lose their
lubrication and the seals may become leaky. Too long
storage periods must therefore be avoided.
If a rotary heat exchanger is not installed and commis-
sioned within 9 months from the date of delivery it must
be put into operation for minimum 5 minutes in order to
ensure the reliable operation of the motor.
9 Commissioning and maintenance
9.1 Commissioning
■ Check the correct direction of rotation of the wheel; it is
marked by arrows on the casing.
■ Check the function of the control unit.
■ Ensure that the air streams of the rotary heat exchanger
can ow through without obstacles.
■ Check that the installation is correct and whether applica-
tion limits (temperatures, differential pressure, material,
etc.) could be exceeded.
■ Check the tension of the drive belt and the fastening of
the motor.
■ Inspect the sealings on the wheel. When making adjust-
ments, ensure that the wheel rotates smoothly and is not
blocked. The drive torques listed in Table 1 must not be
exceeded.
9.2 Maintenance
Maintenance is restricted to regular visual inspections.
Inspections should be initially carried out about every
3 months and then after trouble-free operation can be
extended to 12 months. The following must be checked:
■ Tension of drive belt
■ Sealing of gear motor
■ Quality of bearings (assess by bearing noise)
■ Function of slide seal
■ Function of transverse seal
■ Condition of casing
■ Condition of wheel
Long experience shows that clogging of heat exchangers is
not expected in normal cooling and air-conditioning systems.
However, if deposits accumulate on the exchanger when
used for special applications, it can be cleaned as follows:
■ Remove dust and bres with a soft brush or vacuum
cleaner. Use caution when blowing dirt out with
compressed air to avoid damage to the wheel. Keep at a
distance!
■ Oils, solvents etc. can be removed with hot water (max.
70 °C) or grease-removing solvents or immersion.
Cleaning with pressure cleaners is possible if the following
is observed:
– a at 40° nozzle is used (type WEG40/04)
– max. water pressure 100 bar
Attention
Do not damage the exchanger mechanically or chem-
ically during cleaning:
→ Select compatible cleansing agents.
→ Clean carefully. The thickness of the material is
less than 0.1 mm!
Commissioning and maintenance
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