7.
To prevent the heat exchanger and the condensate drip tray (Fig. 33/9) from crashing onto the floor, support
them, e.g. with two blocks of wood.(Fig. 33/8).
Loosen the two Phillips screws of the heat exchanger fixing brackets (Fig. 33/7), then carefully lower the heat
exchanger with the condensate drip tray. Pull the heat exchanger and the condensate drip tray towards you
and out of the casing.
Cleaning the heat exchanger
8.
Use a commercially available vacuum cleaner or compressed air to remove contamination from the heat
exchanger.
NOTICE!
Be careful to not damage the fins of the heat exchanger.
Cleaning the condensate drip tray
9.
Clean the condensate drip tray (Fig. 33/9) with a commercially available cleaner or disinfectant.
Check that the condensate drain (Fig. 33/5) (optional) is not blocked.
10.
Reinstall the heat exchanger with the condensate drip tray by following the steps in reverse order. Fix the tem-
perature sensor and the tubes.
11.
If necessary, refill the water system (operating pressure) and check for leaks.
13.
Switch on the power supply.
ð
Cleaning of the heat exchanger and condensate drip tray is complete.
8.1.3 Cleaning the heat recovery unit
Personnel:
Skilled qualified electrician
Special tool:
Commercially available vacuum cleaner
Compressor
1.
DANGER!
Danger of electric shock! Do not touch any live
components! Electrical equipment carries a
dangerous electrical voltage.
–
Switch off the power supply before you
carry out maintenance or cleaning.
–
Only skilled qualified electricians are
allowed to work on the electrical system.
Switch off the supply voltage and secure it against
being switched on accidentally before working on
the unit.
2.
Depending on the unit variant you may have to
remove the inspection access panel or the filter
cover.
FSL-B-ZAB / SCHOOLAIR-B / -B-HE variants
Fig. 34: Removing the heat recovery unit
3.
Grasp the heat recovery unit (Fig. 34/1) by the lug
Maintenance and cleaning
Maintenance > Cleaning the heat recovery unit
Decentralised ventilation units Under sill units
38
