Hy 5 Hygrostat; External Operating Display; Differential Pressure Controller; Ntc 15 Supply Air Temperature Sensor - Maico WS 170 L Notice D'installation

uk │ 4. System components

4.4 HY 5 hygrostat

Also refer to connection option 5 in Chap. 6.12.
For controlling the fans depending on the
relative humidity. The ventilation unit switches
to ventilation level 3 if the set humidity value
is exceeded. If the humidity in the room
drops, the ventilation unit switches back to
the previously selected ventilation level.
If you switch manually from ventila-
tion level 3 to level 2 or 1, this deacti-
vates the automatic function of the
hygrostat temporarily. This is then
switched back to active if the level
drops below the hygrostat set point
once.
Several HY 5 hygrostats may be
connected to the control circuit
board. The HY 5 hygrostat should
never be operated together with a
CO2 or VOC sensor.

4.5 External operating display

Also refer to connection option 3 in
Chap. 6.10.
Using an additional external operating
display, the operation of the ventilation unit
can be displayed, for example, in a building
utility room. The external operating display
has to be supplied by the customer.

4.6 Differential pressure controller

Also refer to connection option 6 in
Chap. 6.13.
A differential pressure controller is required
if the ventilation unit is being operated at the
same time as an air-ventilated fireplace.
The differential pressure control (for example
Wodtke DS 01) serves as safety device to
monitor pressure ratios between the waste
gas pipe and room where the unit is installed.
If necessary, the fans in the ventilation unit
are switched off.
Note the rules applicable to operations
with fireplaces in chapter 3.4.
The differential pressure controller is to be
supplied by the customer.
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4.7 NTC 15 supply air temperature
sensor
Also refer to connection option 7 in Chap.
6.14.
An NTC protects hydraulic re-heating
registers from icing over. The ventilation unit
switches off if the temperature falls below the
frost protection temperature of 5 °C.
The NTC connection is only required to
WS 170 comfort or bypass units in passive-
energy houses  Wiring diagram in Chapters
12.2 or 12.3, item W6.

4.8 Hydraulic reheating register

If a hydraulic reheating register is fitted in a
ventilation system (for example in a passive-
energy house), a supply air temperature
sensor must be fitted to protect against
supply air which is too cold  Chap. 4.7.

4.9 Frost protection heating register

In WS 170 comfort and bypass units, the
pre-heating of outside air is guaranteed by
the electric frost protection heating register
 Frost protection temperatures,
Chapter 6.7.4.

4.10 Earth heat exchanger

An energy-optimised frost protection can be
ensured for the ventilation unit using an earth
heat exchanger.
In summer, an earth heat exchanger also
provides a certain cooling function and
dehumidifying of the outside air. Earth heat
exchangers must be planned carefully with
respect to energy efficiency and air hygiene.

4.11 KNX/EIB bus components

Also refer to Chapter 12.4
The ventilation unit can also be operated
together with KNX/EIB bus components, e.g.
with fan coil actuators or operating panels
from the corresponding KNX supplier.
Further KNX/EIB modules can be integrated
in the system bus without problem, e.g.
CO sensors, timers and motion detectors.
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