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5 - MAINTENANCE
■ Water humidifier
fig. A
- Spray (Fig. A)
It is recommended to service it twice a year:
• Clean the pan,
• Check the drain outlets,
• Check the cleanliness of the runoff screens (if a problem
is found, check the upstream filtration or the water pH) and
correct as necessary,
• Replace the screens if necessary,
• Clean the spray washers (option).
For further information, refer to the instructions delivered with the
unit.
- Run-off (fig. B)
It is recommended to service it twice a year:
• Clean the pan,
• Check the drain valve flow rate,
• Check the drain outlets,
• Check the cleanliness of the cell module.
5.5 - Fan motor assembly
Theoretically, the scroll housing, impeller and shaft require little
servicing unless the air drawn in is dirty and unbalances the
impeller.
If the air is very dirty, check the filters and their assemblies.
Once a year check the anti-vibration mounts, the sleeve seals,
etc.
■ Bearings
The rate at which the bearings require servicing depends on the
fan usage conditions.
Most of the fans are fitted with permanently lubricated bearings.
Under normal operating conditions, they will last for 20,000 hours
of operation.
Special lubricants may be used for certain applications.
We recommend lubricating other bearings once every 7,000 hours
of operation.
■ Drives
Refer to section 3 on the fan motor assemblies.
5.6 - Sound attenuator
No special servicing is required for the sound attenuator baffles.
However, we recommend checking the outside once a year to
avoid fibres coming loose and clogging the filters downstream.
fig. B
5.7 - Heat recovery units
■ Plate recovery units
Once a year, dust off and degrease the plate heat exchangers
and service the control valve if a bypass is fitted.
Also check the frost protection coil upstream of the cross-flow
exchangers.
■ Thermal wheel recuperators
Check the maximum and minimum rotation speeds once a year.
Dust and humidity build up at the bottoms of rotary heat
exchangers when they are not in use.
Clean them if they not to be used during extended periods.
Check the permanently lubricated bearings once a year.
If assembled with a speed controller (variable-speed thermal wheel
recuperator), refer to the manufacturer's instructions
■ Rotor
Periodically check both sides of the rotor for dirt. Clean off any
dirt with compressed air. A suitable detergent may be used to
clean off stubborn dirt.
Also check if the upstream filters are clean and ensure a tight
peripheral seal.
■ Heat exchangers on coils filled with glycol/water mix
Refer to section 3.
■ Heat-pipe heat exchangers
Refer to section 3.
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