Swegon GLOBAL PX User Manual

21
Operation and maintenance instructions
5.1 OPERATING MODE
There are ve main operating modes. The operating
mode determines how the airow or the fan torque
is modulated. The default operating mode is Airow
control. Exceptions are units equipped with backwards
fans without the Constant Air Kit or if Constant Torque
mode has been selected in the product setup menu, in
both cases it is the fan torque that will be controlled and
modulated.
5.0 Functions
In all the operating modes, the supply fan(s) will operate
as per the assigned mode and parameters. The exhaust
fan(s) will operate according to the chosen percentage
of the supply fan (%EXH/SUP ratio). The ve main
operating modes are:
• 1 - Airow control:
Flow control involves operating the air handling unit to keep the pre-set airow constant. The speed of the
fans is automatically regulated to provide correct airow even if the lters begin to become clogged, air
terminals are blocked, etc. Airow control mode is advantageous, since the airow always is exactly as it was
from the beginning. It should however be noted that everything that increases the pressure drop in the
ventilation system, such as blocking of air terminals and dust accumulating in lters, causes the fans to run at
a higher speed. This results in higher power consumption and may also cause discomfort in the form of noise.
There are three airow setpoints to be congured by the user (m³h K1, m³h K2, m³h K3).
• 2 - Torque control:
3 torque setpoints to be congured by the user (%TQ K1, %TQ K2, %TQ K3). The setpoint is congured
in % of the maximal torque.
• 3 - Demand control 0-10V:
The airow is controlled by a 0-10 V signal. The control signal is connected to terminals K2&GND. The assigned
supply airow is set as a percentage of a linear 0-10 V signal. The user denes the link with 4 parameters: Vmin,
Vmax, m³h
Vmin and m³h Vmax, applied to the following diagram. The demand control mode is also
available for modulating fan torque instead of airow (relevant for backwards fans units without Kit CA).
The principle is identical to the demand control mode operation with the dierence that Vmin and Vmax are
connected to a %TQ instead of m³/h.
• 4 - Pressure control:
The airow automatically varies to provide constant pressure in the ducting system. This type of control is
also called VAV control (Variable Air Volume).
Pressure on supply: the airow of the supply fan(s) is modulated to maintain a certain pressure Setting
constant. The pressure is measured by a pressure sensor located in the supply air duct.
Pressure on exhaust: the airow of the exhaust fan(s) is modulated to maintain a certain pressure Setting
constant. The pressure is measured by a pressure sensor located in the extract air duct.
• 5 - MODE OFF :
This stops the AHU

Swegon GLOBAL PX Specifications

General

Brand	Swegon
Model	GLOBAL PX
Category	Air Handlers
Language	English