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5. COMMISSIONING
5.1 Introduction
When servicing air handling units always switch off the electricity on the main and the repair
switch (complete shutdown) and secure from reconnection from unauthorized persons. Only
open the inspection doors when the unit is totally stopped and the fans have come to a stop.
After switching off the unit, the fan impeller will run for about 1 to 3 minutes before stopping
totally. The fan wheel must never be stopped by hand or with an object.
Commissioning, maintenance and repair work should only be carried out by trained
professionals or by people supervised by authorized staff. It is the responsibility of the fitter
to read and understand this guide and other given information.
To commission the DanX 1/2/2 for the first time, the following actions have to be taken:
•
Check if the drain pipes are installed correctly and if the drip trays inside the unit are
clean.
•
Check that all loose parts/accessories have been removed from the inside of the unit.
5.2 Dampers DanX 1/2/3 HP
You will find the following 5 dampers installed in a DanX 1/2/3 HP:
1. Recirculation damper
2. By-pass damper
3. Mixing damper
4. Exhaust air damper
5. Outdoor air damper
Before starting up the unit, make sure that the dampers are opening/closing in the right
direction.
To check this, set the controls to Close (no outdoor air) and the dampers should be in the
following positions:
•
Recirculation damper half open (1) and mixing damper (3) fully open.
•
Outdoor damper (5) and exhaust air damper (4) fully closed.
Now change the program to Open and see if damper 4 and 5 start to open and if damper 1
and 3 start to close. Now set the outside air to 100%, wait a few minutes and check if the
dampers have taken the following positions:
•
Recirculation damper (1) and mixing damper (3) fully closed.
•
Outdoor damper (5) and exhaust air damper (4) fully open.
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