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En
2 For the user
Congratulations, you are the owner of a
ComfoAir 350 Luxe,
an heat recovery unit from Zehnder.
We wish you lots of comfort.
2.1 Glossary
The ComfoAir features:
• Balanced ventilation;
• Heat recovery;
• Bypass for free cooling;
• Frost protection;
• Open fire programme;
• Wireless (RF) control (optional)
• Non-powered extractor hood (optional)
• Preheater element (optional);
• Afterheater (optional);
• Geothermal heat exchanger (optional);
• Analogue input (0-10V);
• Enthalpy (optional).
A concise explanation of these concepts/features is
given in the paragraphs below.
2.1.1 Balanced ventilation
The ComfoAir is a balanced ventilation system. Bal-
anced ventilation means that pollutants from the
kitchen, the bathroom, the toilet(s) and possibly the
storage room are extracted, while the same amount
of fresh air is blown into the living room and bed-
rooms. Gaps under or near the doors ensure a good
through-flow in the dwelling. The air circulation is in
balance.
Ensure that these gaps are never obstructed
by draught excluders or deep-pile carpet, for
example. Otherwise the system will not func-
tion optimally.
A balanced ventilation system consists of:
• ComfoAir (A);
• Duct system for the supply of outdoor air (B) and
the exhaust of indoor air (C);
• Supply valves in the living room and bedrooms (D);
• Exhaust valves in the kitchen, bathroom, the toi-
let and (if present) the storage room (E);
• Optional non-powered extractor hood with 3-po-
sition switch (F).
B
A
C
E
D
F
D
D
D
E
E
2.1.2 heat recovery
Besides ensuring a healthy balance between incom-
ing and outgoing air, the ComfoAir also provides the
benefits of heat recovery. Heat recovery means that
heat from the extracted air is transferred to the fresh,
and usually colder, air from outside the building.
2.1.3 Bypass for free cooling
The bypass is often used during hot days in the sum-
mer season. By allowing colder outside air in at night,
the indoor temperature of the dwelling can be kept
low during hot days. The bypass works automatically:
simply set the required comfort temperature.
2.1.4 Frost protection
The ComfoAir is also fitted with a frost protection de-
vice. This is an automatic protective system that tem-
porarily reduces (or even briefly stops) the supply of
outdoor air to the ComfoAir if there is a risk of freezing
in the ComfoAir. This can occur in the event of moder-
ate to sharp frost during the winter months.
2.1.5 Open fire programme
The ComfoAir is fitted with an Open fire programme.
The Open fire programme is used in houses that have
a fireplace, as there is a risk of air being sucked back
from the chimney. The Open fire programme works
automatically but requires activation by the installer.
While the Open fire programme is activated the
supply and exhaust fan can not be turned off ma-
nually.
2.1.6 Wireless (RF) control (optional)
It is possible to set the ventilation positions of the
ComfoAir with one or more wireless switches. To do
this the ComfoAir needs a build in RF module or a
connected CC Ease panel.
2.1.7 non-powered extractor hood (optional)
It is possible to fit the ventilation system with a non-
powered extractor hood.
A powered extractor hood may nevery be
connected to the same ducting as the Com-
foAir.
The non-powered extractor hood is mounted above
the hob and removes undesirable cooking smells.
There are four types of non-powered extractor ho-
ods available:
• Type 1
Mechanical on/off switch.
- The exhaust valve is operated by tur-
ning the on/off switch.
- The ventilation setting must be set
with the ComfoAir switch;
• Type 2
Electrical on/off switch.
- The exhaust valve is operated by
pushing the on/off switch.
- The ventilation setting must be set
with the ComfoAir switch;
• Type 3
Electrical on/off switch with connec-
tion to the ComfoAir.
- The exhaust valve is operated by
pushing the on/off switch.
- The ventilation setting switches au-
tomatically to an “High” setting;
