AHT Cooling Systems GmbH
on21.05.2018 21:36
Page 43
361929_0917_BA_SM_V4_06.09.2017_U_enUS_CD.docx
After finishing the defrosting process, the cooling
function must be switched back on.
Switch on the cooling function (start normal mode):
Press the
[DEFROST]
button.
The red warning lamp illuminates until the
temperature limit value has been reached.
Then the lamp is lit green.
Switching between operating modes:
Press rocker switch no. 6.
Operating mode deep-
freezing “-”:
Lamp 3a illuminates green
Operating mode cooling “+”:
Lamp 3b illuminates green
AHT electronic controller
There are 4 buttons available as operating elements,
which are allocated as follows:
Fig. 2.1
Fig. 2.2
Electronic controller, operating elements and screen displays
No
.
Control
element
Function
1.
Button
[+]
Application change (A1-A4)
Increase bus address
2.
Button
[-]
Application change (A1-A4)
Reduce bus address
3.
Button
[MAN.
DEFROST]
Start semi-automatic
defrosting
4.
[STANDBY]
button
Start defrosting manually
Switch the cooling function
on or off
Call up fault code (if point
flashes)
No. Display
Meaning
5
Flashing point
Alarm display
Switch the cooling function on and off
Switch cooling function off (start the defrosting
manually):
Press the
[STANDBY]
button for min. 1 sec.
“---” is shown on the display.
Switch on the cooling function:
Press the
[STANDBY]
button for min. 1 sec.
The temperature is shown on the screen
display after several seconds.
Setting the application
The following applications A1-A4 (customer-specific
approval) can be selected.
Display application set:
Press button
[+]
or button
[-]
for min. 1 sec.
“
StP
” and the currently set application, e.g.
“
A1
” are shown alternately on the display
screen.
If no changes are required, the display returns to the
temperature display after approx. 10 seconds.
Change application:
Press button [+] or button [-] for min. 1 sec.
By pressing button [+] or button [-] several
times, you can run through all released
applications.
Accept new entry:
The new application set is taken over
automatically after 10 seconds.
Assigning the bus address
Before assigning, the devices must be networked
with a corresponding bus cable. On the last device,
the bus cabling must be terminated with a terminal
resistance. By default, the controllers are delivered
with the bus address “00” (corresponds with a “stand-
alone” device).
For the identification of several devices in a bus
system, the bus addresses must be assigned
beginning with “01”. Bus addresses must not be
assigned more than once.
Then we recommend entering the addresses
according to the actual wiring sequence. In doing so,
max. 48 addresses are possible.
Procedure for assigning the bus addresses:
1.) Keep the
[+]
button and
[-]
button pressed for at
least 5 seconds at the same time.
“
Adr
” is shown on the display alternately with
the current bus address, e.g. “
00
”.
2.) Assign a higher bus address:
Press the
[+]
button briefly.
Assign a lower bus address:
Press the
[-]
button briefly.
3.) Accept new bus address:
wait 10 seconds.
The temperature is shown on the display
again.
4.) Repeat points 1 to 3 on each device and set a
free bus address.
Semi-automatic defrosting
1.) Start the semi-automatic defrosting:
Press the
[MAN DEFROST]
button briefly.
“
-d-
” and then “
dFr.
” is shown on the display.
Defrosting duration: up to 99 min. (device-specific).
5
.
1
