6
Rittal air/water heat exchanger assembly instructions
3 Device description
EN
3.1.4 Safety equipment
– To protect against overcurrent and overtempera-
ture, the fan is equipped with a thermal winding
protection.
– The unit has one (in the case of the Basic control-
ler) or two (in the case of the Comfort controller) in-
tegral floating contacts on the connection terminal
(system message relay with change-over contact,
terminal 3 – 5) which may be used to retrieve mes-
sages from the heat exchanger, e.g. via PLC.
– Units with Basic and Comfort controllers are also
equipped with a condensate alarm.
3.1.5 Condensation
At high levels of humidity and low cooling water tem-
peratures inside the enclosure, condensation may
form on the heat exchanger.
Any condensation that forms on the heat exchanger
(with high humidity and low water temperatures) is
routed to the right and/or rear out of the unit via a
drain opening in the evaporator tray. For this pur-
pose, a hose must be connected to one of the two
condensate nozzles (see “4.4 Connecting the con-
densate discharge”, page 10). The drain which is not
required should be tightly sealed. The condensate
must be able to run off freely. The hose used for
draining off condensate must be laid free from kinks
and checked for correct drainage.
Units with Basic and Comfort controllers are also
equipped with a condensate alarm.
Condensate hoses are available as accessories
(refer also to the accessories section in the Rittal
Catalogue).
3.1.6 Leak detection
If a leakage or pipe breakage occurs in the water
circuit of the air/water heat exchanger, a magnetic
valve immediately stops the cooling water supply,
the floating change-over contact activated and the
fan switched off.
3.1.7 Door limit switch
The air/water heat exchanger may be operated with
a door limit switch connected. The door limit switch
is not included with the supply (available as an ac-
cessory, Model No. PS 4127.000).
The door limit switch function causes the fan and the
magnetic valve in the air/water heat exchanger to be
switched off after approximately 15 seconds when
the enclosure door is opened (contacts 1 and 2
closed). This prevents the formation of condensation
inside the enclosure while the enclosure door is
open.
The fan will start up after about 15 seconds on clo-
sure of the door. Connection is made at the terminals
1 and 2. The extra-low voltage is supplied by the in-
ternal power pack; the current is approx. 30 mA DC.
3.1.8 Additional interface X3
(Comfort controller only)
An additional interface card may be connected to
the 9-pole SUB-D connector X3 in order to incorpo-
rate the air/water heat exchanger into higher-level
monitoring systems (available as an accessory,
interface card Model No. SK 3124.200).
3.2 Proper usage
Rittal enclosure air/water heat exchangers were de-
veloped and designed in accordance with the state-
of-the-art and the recognised rules governing techni-
cal safety. Nevertheless, if used improperly, they
may pose a threat to life and limb or cause damage
to property. The unit is only intended for cooling
enclosures. Any other use is deemed improper.
The manufacturer will not be liable for any damages
caused as a result of improper use, or for incorrect
assembly, installation or use. All risk is borne solely
by the user.
Proper usage also includes the observation of all
valid documents and compliance with the inspection
and servicing conditions.
Note:
The door limit switches must only
be connected free from potential.
No external voltages!
Note:
For air/water heat exchangers with basic
control, the fan continues to run even when
the door is open.
Note:
The electrical signals at the interface are of
an extra-low voltage (not extra-low safety
voltages in accordance with EN 60 335).
Summary of Contents for SK 3209. Series
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