Protective Safety Functions - Swegon CASA W4 Smart Installation, Operation And Maintenance Instructions

1.6 Protective functions
Heat exchanger's freeze protection
W4's reliable defrosting function guarantees continu-
ous and balanced ventilation in the home even during
extreme conditions. If there is a risk of the heat ex-
changer in the ventilation unit freezing, the preheater
is activated and the speed of the fans is changed and in
doing so the heated extract air prevents freezing inside
the heat exchanger.
The fans' thermal overload protection
The fans have thermal overload cut outs, which stop
them if the temperature rises too high. The controller
also stops the fans if a serious malfunction occurs in the
ventilation unit. The protective function resets itself au-
tomatically when the temperature drops or the malfunc-
tion has been remedied.
Electric air heater
An automatic thermal overload cut-out switches off
the air heater if a fault situation arises. This protective
device automatically resets itself when the air heater has
cooled down.
The thermal overload cut out with manual reset can be
reset by pressing a button inside the ventilation unit.
The acknowledgement buttons are located next to the
air heaters. The buttons are marked in the illustrations
below. When you press the reset buttons and feel a
click, the overtemperature protection (thermal overload
cut out) has then been reset.
Econo model's water-heated air heater
On the Econo models, there is a temperature sensor
that protects the water-heated air heater from freezing.
The "Water radiator freezing warning" alarm appears
on the screen if the temperature of the water heated air
heater drops too low, but the unit continues to operate
normally.
If the air heater's temperature drops further, the control-
ler will stop the ventilation unit to prevent the air heater
from freezing. When the temperature of the air heater
has risen sufficiently, the ventilation unit and panel
show a so-called remaining info-alarm,
alarm can be reset from "Alarm" on the main menu.
Temperature sensors
If a sensor fault is detected, the ventilation unit enters
restricted mode to prevent damage to the ventilation
unit. The functions related to the current sensor in ques-
tion are deactivated and the ventilation unit works as
well as possible. The ventilation unit's function returns
to normal once the fault has been corrected.
Swegon reserves the right to alter specifications.
Reset button for the over-
temperature protection on
the preheating air heater
. The Info
W4.311016
Reset button for the over-
heating protection on the
preheating air heater
(Only models with electric
air heater)
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