Configuration Manual

ManualsBrandsSystemair ManualsAir Handling UnitsTopvex SC20-R-S - S-SC20-R-N-ePM1/60-CE-SD-C1-ePM10/60-AC

Version Document

001

ccess V4.X Configuration manual

10 (56) 2018-07-11

Settings Frost protection (1/2/3)

Settings for stopped and running mode

Settings Exchanger & defrosting

Step control settings for Step start/stop points, min switch time, outdoor temp/fan

speed block of steps etc.)

Step settings

Fan heat/cool settings (Fan compensation)

Pretreatment

Fan control

Activate: Configuration > Function Configuration > Function Activation

Fan control type

1. Pressure

2. Flow

3. Manual

4. External

5. Supply air pressure and extract air slave

6. Supply air pressure and extract air flow slave

7. Extract air pressure and supply air slave

8. Extract air pressure and supply air flow slave

The rotational speed is controlled by output signal (0 – 100%).

A digital Activate signal is normally used for each fan (“Supply air fan start” and

“Extract air fan start”), for sending a start signal to the frequency converters/EC-

motor. The start signal is activated as long as the fan is expected to be running.

For the supply and extract air fans, there are 1..3 individually settable setpoint

values, one corresponding to Low speed, one corresponding to normal speed and

one corresponding to high speed. Changing between the setpoint values is done

using the timer channels for normal low and high speed or using digital input

signals. Extended Operation, Low, normal and high speed, see chap.14.

Pressure

During pressure control, two separate analogue output signals are used for supply

and extract air and two separate analogue input signals for supply and extract air

for pressure transmitters. The fan speeds are controlled via frequency converters,

thereby maintaining constant pressure. The pressure transmitter inputs are

scalable using “Volt minimum/Minimum (pressure)” and “Volt maximum/Maximum

(pressure)”.

Flow

Instead of giving a pressure setpoint value, it is possible to use an airflow volume

value. The value from the pressure transmitter is recalculated to a volume flow

using the formula below and the fans will be controlled to give a constant flow.

Flow = K *∆ P

Where K and X are settable constants dependent on the fan size and ∆ P is the

differential pressure, measured over the fan. Each fan has its own set of

parameters.

X is normally 0.5 indicating that the flow is proportional to the square root of the

differential pressure.

Flow presentation can be selected, when fan control type not are “Flow”.