6 Operation
Rittal air/water heat exchanger assembly instructions
19
EN
6.1.2 Operating and error display
The Basic controller monitors and controls the air/
water heat exchanger. It indicates the operating and
error status via the green and red LEDs (Fig. 17,
nos. 3 and 4):
Tab. 3: Operating and error display of the Basic controller
The overtemperature message (red LED illuminated)
may also be polled via an integral floating contact
on the connection terminal of the air/water heat
exchanger (system message relay with change-
over contact, see connection diagrams under
“4.7.2 Installing the power supply”, page 15):
– Terminal 3: NC (normally closed)
– Terminal 4: C (connection of the supply voltage
to the system message relay)
– Terminal 5: NO (normally opened)
The NC and NO definitions refer to the de-energised
state. As soon as power is applied to the air/water
heat exchanger, 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 air/water heat exchanger.
As soon as an error message occurs or the power
supply is interrupted, the relay drops out.
6.1.3 Basic controller test mode
The Basic controller is equipped with a test function,
whereby the air/water heat exchanger commences
cooling operation independently of the set tempera-
ture or door limit switch function.
First you must dismantle the trim panel of the con-
troller.
• Switch off the mains voltage.
• Remove the louvred grille in which the controller is
installed.
• Release the display lock from behind and pull it
forwards slightly.
Fig. 18:
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.
LED
Status
Cause
Solution
Green
(line)
Illumi-
nated
Voltage present,
unit operational.
–
Flashing
Only with door limit switch installed:
Enclosure door open.
In order to avoid condensation, close the
enclosure door as quickly as possible.
Only with door limit switch installed:
Enclosure door closed.
Check the position of the door limit switch.
Red
(alarm)
Illumi-
nated
The enclosure internal temperature is 10 K
above the set temperature.
Check the temperature setting. Check the heat
exchanger and, if necessary, clean. Check the
heat loss to be dissipated; it must not exceed
the rated cooling capacity of the air/water heat
exchanger.
Flashing
Leakage alarm in the water circuit.
Check the water hoses and, if necessary,
clean or seal again.
Connection to board interrupted.
Check, replace board if necessary.
Off
No
display
No power.
Check power supply.
Rotary current phase monitoring:
“LED off” = Incorrect phase connection.
Swap phases.
Summary of Contents for SK 3209. Series
Page 2: ......
