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5.1.1 HOME SCREEN
The home screen displays the current key data
for the air handling unit and is shown is nor-
mally displayed if no other menu has been se-
lected or if selected from the main menu. The
touch screen switches to the sleep mode after
20 minutes. To leave the sleep mode, press on
the touchscreen.
On the main screen, the fields are:
• Current operation mode
The operation modes are: STOP, Heating,
Cooling, Post ventilation, Freecooling, Frost
protection.
• Current date and time
• Active alarms
This fields shows the number of current
alarms. By clicking on this field, more de-
tailed information about the different
alarms is available
• Menu
Accessing the main menu, see section 5.1.2
• Flow Chart
The flow chart is not editable by the user,
the configuration of the activated options
and functions is done throught the product
setup (menu). A code and a special training
are desired for access to this menu. The ap-
pearence of the image varies depending on
the type of air handling unit and its selected
functions and/or options. Flow chart sym-
bols:
Bypass (closed/
open)
Electrical heating
coil
Motorised damper
(open/closed/
opening)
16
Current operation
status
Main menu
Number of current
button
alarms
Operation and maintenance
instructions – CLASS UNIT TAC5
5.1.2 MAIN MENU
The main menu consists of a rotary menu with 6 icons.
Control
The control menu will allow for the user to
change basic parameters and operation status
of the unit.
The unit can be switched on/off
The fan speed can be selected; three manual
speeds + one auto speed
Post heating, post cooling and free cooling
setpoints can be changed.
Alarm
Alarms are displayed on the main screen of
the HMI. Active alarms can be viewed in this
menu. All the alarms can be reset.
A fault can be traced by examining the func-
tion or functional component indicated in the
alarm text. More information
about the indi-
vidual alarms, see section 7.0
If the fault cannot be immediately remi-
died:
Consider whether the air handling unit can
continue to operate until the fault has been
remedied.
Time schedule
The built-in timer enables you to control the
AHU's operating mode/time. Certain other
oversteering functions such as external timer,
communication, etc. affect the preset operat-
ing modes.
The controller allows 6 time slots
(channels) to be configured.
Time and date
The current date and time can be set and adjusted
if needed. The timer automatically takes leap years
into consideration. The system is preset for automatic
changeover between summer time/winter time accord-
ing to EU Standard.
Time schedule
Times and days can be set when the air handling unit is
to run in the high speed mode, medium speed mode, low
speed mode or be switched off. For each day (Monday -
Sunday), six different time slots can be configured. The
time slots are subsequent.
Seasonal management
The seasonal management menu allows for the deacti-
vation of heating coils, cooling coils and bypass freecool-
ing function based upon a year calendar. In between the
programmed interval, the selected function is OFF.
Operation and maintenance
instructions – CLASS UNIT TAC5
17
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