Test Mode For The Basic Controller; Setting The Temperature; Resetting The Basic Controller - Rittal SK 3302.series Assembly And Operating Instructions Manual

The overtemperature message (red LED illuminated)
may also be polled via an integral floating contact on
the connection clamp of the cooling unit (system
message relay with changeover contact, see con-
nection diagrams under "4.6.3 Installing the power
supply", page 14):
– Terminal 3: NC (normally closed)
– Terminal 4: C (connection of the supply voltage
to the system message relay)
– Terminal 5: NO (normally open)
The NC and NO definitions refer to the de-energised
state. As soon as power is applied to the cooling unit,
the system message relay picks up, so that the relay
contacts change status (contact 3 – 4 open; contact
4 – 5 closed). This is the normal operating state of the
cooling unit. As soon as an error message occurs or
the power supply is interrupted, the relay drops out
and contact 3 – 4 is closed.

6.1.3 Test mode for the Basic controller

The Basic controller is equipped with a test function
whereby the cooling unit commences cooling ope-
ration independently of the set temperature or door
limit switch function.
First you must dismantle the trim panel of the control-
ler.
• Switch off the mains voltage.
• Remove the louvred grille or infill panel in which the
controller is installed.
• Release the display lock from behind and pull it
forwards slightly.
Fig. 37: Loosen the trim panel of the Basic controller
• Carefully raise the trim panel, e.g. using your
thumb or a flat screwdriver, and remove it.
You can now start test mode.
• Rotate the potentiometer to the left-hand stop, then
hold the rubberised potentiometer display down
while you re-connect the mains voltage.
RITTAL cooling unit assembly and operating instructions
The cooling unit will commence operation and the
green LED will flash (I_II_I_II_ . . .). Test mode is
completed after approximately 5 minutes. The unit
switches off and changes to normal operation.
Key
I = LED 500 ms on
_ = LED 500 ms off
In normal operation, the green LED is permanently
illuminated.
• Next, rotate the potentiometer back to the required
setpoint.

6.1.4 Setting the temperature

Note:
With the Basic controller, the temperature
is preset at the factory to +35°C.
In order to save energy, do not set the
temperature any lower than is actually
necessary.
To change the temperature setting:
• Dismantle the trim panel of the controller as
described in "6.1.3 Test mode for the Basic
controller", page 25.
• Set the required temperature on the temperature
setting device (Fig. 36, page 23).
• Carefully push the trim panel onto the display until
you hear it snap into place.
• Push the display back into the infill panel or louvred
grille.
• Re-attach the louvred grille or infill panel to the
cooling unit.

6.1.5 Resetting the Basic controller

Following a high-pressure alarm in the cooling cycle,
and once the cause has been rectified, you will need
to manually reset the Basic controller:
• Dismantle the trim panel of the Basic controller
as described in "6.1.3 Test mode for the Basic
controller", page 25.
• Press the reset button (Fig. 36, no. 5) for at least
3 sec.
The red LED is extinguished.
• Re-install the Basic controller.
6 Operation
25
EN