21
• Check for possible condensate/moisture. Condensate
may form in the period before the first start-up of the
AHU as a result of weather change and/or humid air
from the building. Remove all condensate from the
construction components and dry the electrical
components using warm (dry) air (e.g. with a hair
drier).
• Check the supply
• The unit supply must be protected by a correctly sized
fuse.
• Connect all external sensors, control devices and
external controls to the terminal board as shown in the
wiring diagram supplied.
• If required include alarms, release signals and similar
elements in the BMS or on the external panel.
• Set the controller for the specific project parameters,
such as operating times, holidays etc. Follow the
instructions given in the operating instructions for the
“Pro Dialog AHU control”.
• The control panel is ventilated using exhaust air. To
ensure the air flow there is a grille in the control panel
hatch. This must not be covered.
• The control panel hatch must be locked when the AHU is
started.
CAUTION: If the AHU includes an electric heater, the
heater needs to have a separate power supply.
4.14 - Installation of external sensors included
Outdoor air temperature sensor
The passive PT1000 sensor must be
installed outside on a wall with north
exposure. Ensure that the gland is at
the bottom. This sensor (if required) is
supplied separately and must be
connected to the control panel after
the unit has been installed. In the
control diagram this sensor is shown
as 23TT22 (TT6).
Room temperature sensor
The passive PT1000 sensor includes
room temperature correction with
regard to the required setpoint. The
sensor must be positioned in the
representative room and not be
exposed to direct sunlight and not be
near a local heat source.
This sensor (if required) is supplied
separately and must be connected to the control panel
after the unit has been installed. In the control diagram this
sensor is shown as 24TT4 (TT5).
Duct pressure sensor
The active sensor (24 V) has a
maximum measurement range of up
to 3000 Pa.
This sensor (if required) is supplied
separately and must be connected
to the control panel after the unit has
been installed. In the control diagram
this sensor is shown as 25PDT13 (PT3). The sensor cannot
be placed in the outdoor air.
The “+” pressure measurement point must be in a
representative and stable position in the supply air of the
duct system (not directly after a damper, bend, branch or
similar). The “–“ pressure measurement point can measure
atmospheric pressure in the room.
CO
2
sensor
The active sensor (24 V) must be
placed in the correct room in a location
that is representative of the CO
2
concentration in the room. Connect
terminal 7 - 8 in the CO
2
sensor to the
correct terminal at the terminal strip in
the control panel.
This sensor (if required) is supplied separately and must be
connected to the control panel after the unit has been
installed. In the control diagram this sensor is shown as
25QT22(QT)
