Argus RC C

ManualsBrandsSystemair ManualsAir Distribution ProductsArgus-RC-C3 Room controller - Room controllers with Modbus communication

RC-C

Control states

Argus-RC-C can be conﬁgured for different control

states/

control sequences:

• 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

Operating modes

There are ﬁve different operating modes: Off,

Unoccupied, Stand-by, Occupied and Bypass. Occupied is

the preset operating mode. It can be changed to Stand-by

with a dipswitch. The operating modes can be activated

via a central command or an occupancy detector.

Off: Heating and cooling are disconnected. However,

the temperature must not drop below the set minimum

temperature (Factory setting (FS)=8°C). Operating mode

Off is activated on open window.

Unoccupied: The room where the controller is placed

is not used for an extended period, for example during

holidays or long weekends. Both heating and cooling

are disconnected within a temperature interval with

conﬁgurable min/max temperatures (FS min=15°C,

max=30°C).

Stand-by: The room is in an energy save mode and is

not used at the moment. This can for example be during

nights, weekends, evenings etc. The controller is prepared

to change operating mode to Occupied if someone enters

the room. Both heating and cooling are disconnected

within a temperature interval around the applicable

setpoint (FS heating setpoint value=-3°C, cooling

setpoint=+3°C).

Occupied: The room is in use and is therefore in a

comfort mode. The controller regulates the temperature

around a heating setpoint (FS=22°C) and a cooling

setpoint (FS=24°C).

Bypass: The temperature in the room is controlled in the

same way as in operating mode Occupied. The output

for forced ventilation is also active. Bypass is useful for

example in conference rooms, where many people are

present at the same time for a certain period of time.

After 10 minutes absence, the controller will

automatically return to the preset operating mode

(Occupied or Stand-by).

Occupancy detector

By connecting an occupancy detector, Argus-RC-C

can switch between Bypass and the preset operating

mode (Occupied or Stand-by). The temperature is then

controlled according to requirement, which saves energy

and keeps the temperature at a comfortable level.

Change-over function

Argus-RC-C has an input for change-over that

automatically resets 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, the output function

is set to heating and when the temperature drops below

18°C, the output is set to cooling.

As an alternative, a potential-free contact can be used.

When the contact 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.

Setpoint

In Occupied mode, the controller operates from a heating

setpoint (FS=22°C) or a cooling setpoint (FS=24°C) that

can be changed centrally or locally using dipswitches.

The setpoint can be adjusted up and down

(FS=±3°C) with the knob on the front of the controller.

Switching between heating and cooling setpoints is done

automatically in the controller depending on the heating

and cooling requirement.

Built-in safety functions

Argus-RC-C has an input for a condensation detector

which prevents condensation. The controller also has frost

protection. It prevents frost damages by ensuring that the

room temperature does not drop below 8°C when the

controller is in Off-mode.

Indications

The controller has an LED shaped like a thermometer on

the front. A red indication is shown when heating control

is functional and a blue indication when cooling control is

active. No LED indication shows that neither heating nor

cooling control is active.

Actuator exercise

All actuators are exercised. The exercise takes place at

set intervals in hours (FS=23 hours interval). An opening

signal is sent to the actuator for as long time as the run

time has been conﬁgured. Then a closing signal is sent for

as long time and the exercise is ﬁnished.