29
Fig 42: Outdoor casing fan box
J
(2x)
10. After inspection, mount all parts in reverse order.
When installing the heat exchanger box, ensure correct locking with the fan boxes by means
of the tongue-and-groove joint!
Fig 43: Push direction of the fan boxes for locking with the heat exchanger box
11.
Connect the cable for potential equalisation to the flat plug of the casing cover.
12.
Close the casing cover by turning the 4 captive screws of the quarter turn locks by 90°.
13.
Re-establish the mains connection.
Visualising of operating modes
The control unit is equipped with 3 LEDs for signalling of operating modes.
The following operating conditions are shown with LED-signalling:
LED
Signalling
Condition / cause
LED 1
lights
Device operational / operating voltage supplied
LED 2
lights dark
Normal operating mode
flashes
Temperature downstream of preheater too low, fans are switched off
flashes 2x per second Temperature downstream of preheater < 1K below threshold value
flashes 3x per second Temperature downstream of preheater < 2K below threshold value
flashes 4x per second Temperature downstream of preheater < 3K below threshold value
LED 3
lights Preheater
heats
Tab. 9: Overview visualising operating modes
J
