Protective Functions; Automatic Energy Saving System - Swegon CASA W5 SMART Installation, Commissioning And Maintenance Instruction

almost free of charge by utilising the difference be-
tween indoor and outdoor temperatures and the heat
exchanger intelligently. The heat exchanger takes care
of the cool indoor air during hot summer days and cools
the incoming outdoor air. At night the air passes the heat
exchanger and the home is cooled with fresh outdoor air.
This is managed by an advanced automatic system.

1.6 Protective functions

The heat exchanger's freeze protection
W5's defrosting function guarantees continuous and bal-
anced ventilation in the home even during extreme condi-
tions. If there is a risk of the heat exchanger in the ventila-
tion 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' overheating 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
The electric air heater is equipped with overtemperature
protection. If the overtemperature protection trips, you
must not continue to use the ventilation unit until the
cause of the overtemperature protection tripping has
been established and the fault has been rectified.
An automatic overtemperature protection 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.
Ventilation unit with water-heated air heater
The ventilation unit with water-heated air heater has a
temperature sensor that protects the air heater from freez-
ing. The air heater 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 controller
will stop the ventilation unit to prevent the air heater from
freezing. An alarm is then shown on the cooker hood.
When the temperature of the air heater has risen suf-
ficiently, the ventilation unit and panel show a so-called
remaining info-alarm, . The Info alarm can be reset
from "Alarm" on the main menu.
Cold supply air
The ventilation unit has built-in condensation protection
on the ventilation duct. If it is discovered that the supply
air is too cold, the ventilation unit stops and an alarm is
shown the cooker hood.
A
A = Reset button for the overtemperature protection on the
preheating air heater
B = Reset button for the overtemperature protection on the
reheating air heater
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.

1.7 Automatic energy saving system

An advanced automatic energy saving system, that
automatically optimises the operation of the ventilation
unit in cold conditions and provides the best possible
efficiency up to energy class A+.
This functionality maximizes the ventilation unit's annual
energy savings so that the ventilation unit, as seldom as
possible, is in defrost mode (as required). The ventilation
unit then works constantly with the efficiency that is
best for heat recovery. This is achieved using intelligent
algorithms in combination with humidity and tempera-
ture measurements.
2020-11-19
W5 Smart
B
All rights to changes reserved.
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