REC Indovent AB, Box 37, SE-431 21 Mölndal, Sweden
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+46-31-675500
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www.rec-indovent.se
INSTALLATION
Air Handling Unit RT 250/400S-EC-RS
7
Description of terminal blocks
General
Joining of circuits is made on the bottom circuit
card. To access the circuit card, remove the DUC
(see previous page).
Texts on the circuit card show where to connect
what. All terminals have a Jxx No. on pin 1, and a
small triangle.
When in the following text for example J26/1,2 is
stated, it means that the function should be
connected to terminal J26, pin 1 and 2.
Where appropriate, the signal is marked on the
card.
External cooling (terminal J8/1,2,3)
The AHU can be fitted with an external water
cooling coil, for example natural cooling from a
drilling hole. The cooling coil is controlled via an
external control valve
(0-10 V).
After-heating water (terminal J/1,2,3)
The water heater is controlled via an external
control valve (0-10 V).
(The cable may already be connected upon
delivery)
Temperature sensors (terminal J9)
Temperature sensors (PT1000) for outdoor air,
supply air, exhaust air and extract air are already
connected upon delivery.
Room sensor (terminal J10/1,2)
If a room sensor is installed, this must be stated in
the AHU's configuration. This is done by a
qualified installer.
Frost protection - After-heater (terminal J10/3,4)
In connection with water heating, a frost protection
(temperature) sensor is fastened on the return wire
of the after-heater, in order to protect the after-
heater from freezing,
Modbus (J12)
Terminal for possible modbus communication.
ECO Remote (J100)
Terminal for connecting a remote control (optional)
with among other things change-over switch for
ECO mode and alarm indication.
NOTE! When using ECO Remote, DO6 must be
configured for Normal flow, DO7 for Sum alarms
and D12 for ECO.
Fans (J13 and J14)
Terminals for the fans. These are already
connected upon delivery.
By-pass (J28)
Connection terminal for the by-pass damper.
Optional terminal for by-pass (J29)
Extra connection terminal for by-pass damper
(some AHU models)
Ext.1, Ext.2 and Ext.3 (terminals J23 to J25/1,2)
As an optional extra, you can choose to connect
three external switches
that will change the speed of
the fans in accordance with the preset
values.
Suitable air flows have been preset, but may be
altered by a qualified installer, using the control
panel.
To see which options are available, please turn to
chapter "Operation & control unit".
Start/stop (terminal J26/1,2)
An external switch for "Start/stop" can be
connected. The switch makes the AHU stop
running, but does not make it powerless.
If this function is used, the jumper J34 should be
moved to mode OFF.
Optional terminal for filter guard (J21)
For some of the larger AHU models only.
Relay outputs (terminals J19, J20)
The system has 4 identical relay outputs which can
be configured to various functions. The
configuration shown above is one example, and
others may be made.
To see which options are available, please turn to
chapter "Operation & control unit".
A condensation boiler (KAVK), if any, would be
installed at the factory.
Mains voltage (terminals J15, J16, J17)
230VAC, 50Hz
Casing (terminal J18)
Ground connection of the casing.
Electric heating, voltage feed (terminal J5/2,3)
Pin 2 phase, pin 3 zero (blue).
Electric heating, control signals (terminal J4)
Frequence converter (terminal J6)
For some of the larger AHU models only.
