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11.2 Replacing the fan
If the fan of the Dumo should fail the device will indicate this by relaxing both alarm relays and outputting a
constant mA signal of > 22 mA.
Confirm that the fan has stopped rotating or slowed down significantly.
Make sure that your replacement fan is an official Sintrol spare part. Using third party fans might affect the
performance and accuracy of the Dumo and will void warranty.
1) Disconnect power to the Dumo
2) Remove the rear cover by removing these 5 screws:
Figure 24: Removing the rear cover
3) Disconnect the fan cable. The connector is locked into place with a threaded locking ring which can be
loosened by turning it counter-clockwise with needle-nose pliers.
Figure 25: Replacing the fan
4) Install the new fan. Make sure to properly tighten the connector locking ring. Install the front cover
with the 5 screws, tightening then to maximum 7 Nm. Pay attention that the fan cable is entirely in the
designated groove and does not squish between the front plate and the Dumo body.
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