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Follow table 1 below for setting. (FS) in the text indicates factory set-
ting.
Table 1. I/O connection terminals
Ter-
Desig-
Operation
minal
nation
10
G
Supply voltage 24 V AC
11
G0
Supply voltage 0 V
12
DO1
For fan control, low speed. 24 V AC output, max
0.5 A. 24 V AC relay is connected between termi-
nal 12 and terminal 20, GDO.
13
DO2
For fan control, medium speed. 24 V AC output,
max 0.5 A. 24 V AC relay is connected between
terminal 13 and terminal 20, GDO.
14
DO3
For fan control, high speed. 24 V AC output, max
0.5 A. 24 V AC relay is connected between termi-
nal 14 and terminal 20, GDO.
20
GDO
24 V AC out common for DO. Internally connected
to terminal 10, G.
21
G0
0 V common for UO. Internally connected to
terminal 11, G0.
22
DO4
For forced ventilation. 24 V AC output, max 0.5 A.
24 V AC actuator is connected between terminal
22 and terminal 20, GDO.
23
UO1
Control of heating (FS) or cooling via change-
over.
For 0...10 V DC valve actuator, max 5 mA (FS).
The valve actuator's 0...10 V control signal ter-
minal is connected to terminal 23 and its supply
terminals to terminals 10 and 11. Make sure that
the reference pole G0 is connected to the correct
terminal on the actuator.
alternative
For 24 V AC thermal actuator, max 2.0 A. The
thermal actuator is connected between terminals
23 and 20, GDO.
Choice of actuator (NO/NC), see the parameter
list, parameter 73.
Selection of output function, analogue or digital,
go into the parameter menu and change parame-
ter 20 to thermal actuator.
24
UO2
Control output heating or cooling (FS).
For 0...10 V DC valve actuator, max 5 mA (FS).
The valve actuator's 0...10 V control signal ter-
minal is connected to terminal 24 and its supply
terminals to terminals 10 and 11. Make sure that
the reference pole G0 is connected to the correct
terminal on the actuator.
alternative
For 24 V AC thermal actuator, max 2.0 A. The
thermal actuator is connected between terminals
24 and 20, GDO.
Selection of output function, analogue or digital,
go into the parameter menu and change parame-
ter 21 to thermal actuator.
30
AI1
For external room sensor, PT1000. Range 0...50°C.
Sensor is connected between terminals 30 and 41,
AGnd.
31
UI1
For switching between heating and cooling on a
two-pipe system (Change-over).
PT1000-sensor is connected between terminals
31 and 41, AGnd. Range: 0...100°C.
alternative
For potential-free contact. A potential-free contact
is connected between terminals 31 and 40, +C.
32
DI1
Occupancy detector. A potential-free contact is
connected between terminals 32 and 40, +C.
Closed contact corresponds to occupancy.
See also section Occupancy detector below.
33
DI2/CI
Regin's condensation detector, KG-A (FS). The
sensor is connected between terminals 33 and 41,
AGnd.
alternative
Window contact (DI)
A potential-free contact is connected between
terminals 33 and 40, +C. Closed contact indicates
closed window.
40
+C
24 V DC out common for DI and UI (with digital
function)
41
AGnd
Analogue ground, reference for AI and UI (with
analogue function)
42-43
No function
RC-DFO
Settings
FS values can be changed in the parameter menu in the display.
Control states
RC-DFO can be configured for different control states /control se-
quences:
•
Heating
•
Heating or cooling via the change-over function
•
Heating/Heating
•
Heating/Cooling
•
Heating/Cooling with VAV-control and forced supply air
function
•
Heating/Cooling with VAV-control
•
Cooling
•
Cooling/Cooling
Heating/Cooling with VAV-control and forced supply air function
Heating and Cooling in sequence, where cooling is obtained by vary-
ing the airflow. The cooling output is used for controlling the supply air
damper on both heating and cooling demand. When the ventilation is
forced, the cooling output is set to full cooling, regardless of what the
controller output signal is.
Heating/Cooling with VAV-control
Heating and cooling are controlled in the same way as in the VAV-
control above. However, it is not possible to force the damper. The
cooling output has a configurable min. limit to ensure a minimum
basic ventilation in the room. A max. limit can be set for the airflow
when heating is active. If the heater is not positioned in the supply air
duct and you do not want the damper to open on heating demand,
you should set the max. limit to equal the basic flow.
Change-over function
RC-DFO has an input for change-over that automatically resets the
output UO1 to operate with heating or cooling function. The input can
be connected to sensors of type PT1000 and have the sensor mounted
so that it senses the temperature on the supply pipe to the coil.
When the temperature exceeds 22°C (FS), the output function is set
to heating and when the temperature drops below 18°C (FS), the
output is set to cooling.
As an alternative, a potential-free contact can be used. When the con-
tact is open the controller works with the heating function and when it
is closed, with the cooling function.
To ensure satisfactory functioning using sensor, the system must
have continuous primary circuit circulation. When the change-over
function is not used, the input must be left disconnected.
Operating mode
There are five different operating modes. Switching between these
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