Rittal air/water heat exchanger
7
3 Device description
EN
3.2.2
Control
Rittal air/water heat exchangers are fitted with an
e-Comfort controller for setting the functions of the heat
exchanger.
3.2.3
Bus mode
The serial interface X2 allows you to create a bus con-
nection with up to ten air/water heat exchangers using
the master-slave cable (shielded, four-wire cable, Model
No. 3124.100).
This allows you to implement the following functions:
– Parallel unit control (the air/water heat exchangers in
the network can be switched on and off simultaneous-
ly)
– Parallel door status message ("door open")
– Parallel collective fault message
Data is exchanged via the master-slave connection.
During commissioning, assign an address to each unit
that also includes the identifier "master” or "slave” (see
section 6.9 "Setting the master-slave identifier").
3.2.4
Safety equipment
– The EC fan is protected against overcurrent and over-
temperature by the integral electronics.
– The device has two integral floating contacts on the
terminal block 3 – 5, via which system messages from
the heat exchanger may be polled e.g. via a PLC (2 x
normally-open contacts).
– The air/water heat exchanger has a leak and conden-
sate warning. The device also has an overflow via its
base.
3.2.5
Condensation
At high levels of humidity and low cooling water temper-
atures 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 rout-
ed to the front out of the unit via a drain opening in the
heat exchanger tray. For this purpose, a hose must be
connected to the condensate nozzle (see section 4.3.3
"Connecting the condensate discharge"). The conden-
sate 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. Condensate hoses are
available as accessories (refer also to the accessories
section in the Rittal Catalogue).
3.2.6
Leak detection
If a leakage or pipe breakage occurs in the water circuit
of the air/water heat exchanger, a magnetic valve imme-
diately stops the cooling water supply, the floating
change-over contact activated and the fan switched off.
The warning "A08" appears on the display.
3.2.7
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 accessory,
Model No. 4127.010).
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 enclo-
sure while the enclosure door is open.
The fan will start up after about 15 seconds on closure
of the door. The connection is made at terminals 1 and
2. The extra-low voltage is supplied by the internal pow-
er pack; the current is approx. 30 mA DC.
3.2.8
Additional interface X3
An additional interface board may be connected to the
9-pole SUB-D connector X3 in order to incorporate the
air/water heat exchanger into higher-level monitoring
systems (available as an accessory, interface board
Model No. 3124.200).
3.3
Proper use
Rittal enclosure air/water heat exchangers were devel-
oped and designed in accordance with the state of the
art and the recognised rules governing technical 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 in-
cludes the observation of all valid documents and com-
pliance with the inspection and servicing conditions.
3.4
Scope of supply
The unit is supplied in a packaging unit in a fully
assembled state.
Please check the delivery for completeness:
Note:
The door limit switches must only be con-
nected free from potential. No external volt-
ages!
Note:
The electrical signals at the interface are of an
extra-low voltage (not extra-low safety volt-
ages to EN 60 335).
Qty.
Description
1
Air/water heat exchanger
1
Dispatch bag:
1
– Assembly and operating instructions
Tab. 1:
Scope of supply
