Switching Contact (Potential-Free) - Maico WR 310 Notice De Mise En Service Et D'entretien

8.5 Switching contact (potential-free)

310/410 320/470 160 Flat
300 Flat Trio
Functions which can be switched with the
potential-free contact on the main board.
For setting  Switching contact parameter
in Chapter 6.2.
● Alarm
● Filter change
● Operating display
● Supplementary heating
● Pre-heating
● External shutter
● Brine EHE (uncontrolled pump)
● Cooling function
Alarm function: Switching contact open
during operation. In case of malfunction, the
contact remains closed until acknowledged.
Filter change function: The switching con-
tact closes if a filter change is imminent.
Operating display function: If fans are
switched to active (in ventilation level
HPV, RV, NV, PV or IV), the switching contact
closes. The contact remains open when
switching off or in case of malfunction.
ATTENTION with pre-heating/supple-
mentary heating
Incorrect installation will result in unit
damage. If external pre-heating or sup-
plementary heating is selected, the power
supply for the component should be switched
via an external relay.
Supplementary heating function: The
switching contact switches a downstream
heat register on/off. The setting function of the
room setpoint temperature is activated in the
Temperature short code menu ( Chapter
5.3).
The supplementary heat register's supply
voltage is led via an external relay and not via
the contact on the basic circuit board.
Supplementary heating on: Switches on au-
tomatically when the temperature falls below
8 Special functions | UK
the room setpoint temperature.
Supplementary heating off: Switches off auto-
matically when the actual room temperature
exceeds the room setpoint temperature.
The actual room temperature is determined
with the selected temperature sensor  Room
sensor configuration parameter in Chapter 6.2.
Pre-heating function
The switching contact switches an upstream
external pre-heating unit (electric/hydraulic)
on/off. The pre-heating keeps the unit free of
frost.
Pre-heating on: Switches on automatically if
the temperature falls below the minimum air
inlet temperature (factory setting) + T-air inlet
offset heating.
Pre-heating off: Switches off automatically
if the minimum air inlet temperature (factory
setting) + T-air inlet offset heating is
exceeded.
Shutter function: The switching contact
closes as soon as the fans switch on. If there
is no speed, the contact opens. This also
happens during pauses when operating with
humidity protection.
Function brine earth heat exchanger (uncon-
trolled pump)  Chapter 6.8.
Function cooling: The switching contact
closes as soon as the max. room temperature
has been exceeded.
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