Operation and Maintenance Manual (DTR) iSWAY
®
Set of products
Version 1.8 of 2.2021
13
Fig. 3.5. Exemplary connection of the iSWAY-
WFC®
unit and pressurized space.
Generating the required pressure value when the protected space is closed and ensuring
adequate air velocity through open doors connecting the protected space with the unprotected
space, prevents infiltration of smoke and hot fire gases into the protected space, ensuring that
escape routes are maintained and that rescue and firefighting crews are able to reach the
protected space in a smoke-free state (possibly in a state of slight smoke, at which it is possible
to carry out evacuation and rescue and firefighting operations). The supply of air to the
overpressure protected space can be carried out using a single supply point, as well as a multi-
point supply.
The amount of air supplied to the protected space (e.g. staircase) during the operation of the
pressure differential kit is variable. It results from a different air demand when device is
generating the required overpressure in the protected space (with all doors between the protected
zone and the unprotected zone in the closed position), and another when device is generating the
required speed of air flow through any door dividing the protected zone and the unprotected zone
that has been opened.
In the case of the iSWAY-FC
®
, iSWAY-WFC
®
and iSWAY-RFC
®
units, the above mentioned change
in the air supply is realized by using an MAC-FC controller and a frequency converter, which
controls the fan performance by changing the fan motor speed.
In the case of the MAC-D-MIN controller, the change of the supply air volume is realized by means
of a control damper with an electric rotary actuator.
The iSWAY-FC
®
, iSWAY-WFC
®
and iSWAY-RFC
®
pressure differentials provide continuous
monitoring of the overpressure value in the protected space in relation to the adopted reference
pressure. The use of the MAC-FC controller, which sends a control signal to the frequency
inverter, and the MAC-D-MIN controller, which sends a control signal to the control damper,
means that the pressure differential system does not require the use of overpressure relief
dampers, which remove the excess air when the permitted overpressure threshold is exceeded.
This is particularly important for installations in which large air flows are supplied to the protected
space in order to provide normative pressure and flow criteria. As a result, large mechanical flaps
are required, which may be difficult or impossible to implement.
Surrounding pressure
measuring point (reference)
Static pressure measuring point
in the protected space
Current shunt
Protected space type:
staircase, fire vestibule, escape corridor
