Temperature Setting And Monitoring System; Warning System - AHT ATHEN 175 Manual Del Usuario

AHT Cooling Systems GmbH
When setting the nominal value, you can only select from
those control ranges that have been approved.
Unless the customer has specified otherwise, the following
parameters are approved:
Freezer unit: A1
Meat unit: A3
Convertible unit: A1 and A3
Selecting the approved nominal temperature:
The nominal value can be selected by briefly holding down the
+ / - button. The currently selected parameter appears on the
display. Briefly hold down the + / - button again to select the
next nominal value, e.g. A2.
parameters have been run through, A1 will be displayed
again. The selected setting is adopted automatically 5
seconds after the last button is pressed. However, it is
advisable to re-start the unit as follows: If you press the
"Standby / Reset" button for at least 1 second the unit will
switch to standby mode. The display shows: "- - -". If you
press the "Standby / Reset" button once more the unit will
switch on again and the unit's internal temperature will be
displayed. This procedure may take a few seconds.
WARNING for (U) series: If you switch from A1 to A3 or
from A3 to A1, the unit's nominal temperature will change
- either from –18°C to +1°C or from +1°C to -18°C!
Selecting bus addresses
Controllers are supplied with the bus address 0. OFF is
displayed as the bus address.
When in this status (OFF), the cabinets / controllers are
not registered in the bus system.
In order to identify cabinets in the bus system, you have to
assign each one an address from 01 upwards. Before
allocating addresses, the cabinets must be linked up using an
appropriate bus cable. The last participant must be fitted with
a terminating resistor. We recommend entering the addresses
following the actual sequence in which the cabinets are wired
up.
Procedure for assigning addresses:
1) Press the STAND BY/RESET button: - - - will appear
in the display and the unit is now switched off.
2)
The +/- button must be pressed 3 times within 1.5
seconds. The display alternates between Adr. and the
address number. For the first cabinet, the display would
alternate between ADR and OFF.
3)
By pressing the +/- button, you can now assign the
next free address on the bus. Press the button once and the
next free address will appear.
o Briefly hold down the +/- button to jump straight to the next
highest bus address.
o Hold down the +/- button for longer to quickly scroll through
the bus addresses. Run through the loop from OFF to
maximum address number.
4)
After 5s, the value is adopted and - - - appears in the
display. The controller must be switched on using the STAND
BY/RESET button.
5) Assign the addresses for the remaining cabinets using
the same procedure as in steps 1 – 4. The next free address
is always selected automatically.
Once all the approved
Alarm and alarm reset
An alarm is displayed in the form of an error code. This error
code alternates with the temperature in the flashing display.
The unit can also sound an audible signal if the optional
buzzer is fitted.
Briefly press the standby/reset button once.
To acknowledge the audible alarm (if connected up), briefly
press the standby/reset button and the error code will
disappear from the display. The display will show a red dot in
front of the tool symbol.
WARNING: If there is no alarm the unit switches off if you
press the "Standby/ Reset button for more than 1 second
(display shows "---").
Table of error codes:
F1, F2, (F3), F4 Sensor failure (base=1,
air=2, evaporator sensor=4)
Clock Flat battery
E20 Temperature alarm
E21 Magnetic valve error
E70 Electronic error
E75 Excessive electronic system
temperature
E99 Compressor error / all other errors
Err MMI (no communication with system)
9 Temperature setting and monitoring
system
The recommended storage temperatures are e.g.
Frozen food:
Ice-cream:
Minced meat:
Dairy products:
Fresh milk:
Fruit/vegetables:
Ensure that the products to be stored are put into storage at
the specified temperature.
If using model range (S) cabinets to store meat and minced
meat, we would strongly recommend not changing the setting
of the electronic thermostat. The present value is optimal for
storing minced meat within the temperature tolerances
required. The relevant statutory rulings must be observed.

9.1 Warning system

There is a plug connection on the rear of (-) cabinets for
connecting up to an external warning system. The potential-
free contacts can be loaded to a low safety voltage of max. 24
V/2 A.
21
-18°C (-17.78°C)
-20°C (-20.00°C)
+1°C (+33.8F)
+6°C (+42.8°C)
+4°C (+39.2°F)
+6 / +12°C (+42.8°F / +53.6°F)